August 2025 – Page 81

liquefied mdi-ll for spray foam insulation: a key component for rapid gelation and superior adhesion to substrates.

liquefied mdi-ll for spray foam insulation: the secret sauce in the foam kitchen
by dr. foam whisperer (a.k.a. someone who’s spent too many nights smelling isocyanates)

let’s talk about the unsung hero of modern insulation—the molecule that sneaks into walls, expands like a startled octopus, and then hardens into a fortress of thermal resistance. no, it’s not magic (though it feels like it). it’s liquefied mdi-ll, and if spray foam insulation were a rock band, this compound would be the lead guitarist—flashy, essential, and slightly dangerous if mishandled. 🔥🎸

what exactly is mdi-ll? and why should you care?

mdi stands for methylene diphenyl diisocyanate—a name so long it probably needs its own passport. the “ll” suffix? that’s low-viscosity liquid. think of it as the espresso shot of the polyurethane world: concentrated, fast-acting, and keeps everything moving.

unlike traditional solid mdi, which is about as fun to handle as a frozen brick, mdi-ll is a free-flowing liquid at room temperature. this makes it a dream for spray systems—no preheating, no clogged lines, no tantrums from the pump. just smooth, consistent delivery. 💧

, a joint venture between south korea’s kumho petrochemical and japan’s mitsui chemicals, didn’t just tweak the formula—they engineered a liquefied mdi variant optimized for spray foam insulation, particularly in cold climates and high-speed applications. and the result? a product that gels faster than gossip spreads in a small town.

why mdi-ll? the science of speed and stickiness

spray foam insulation works through a chemical tango between isocyanate (mdi-ll) and polyol. when these two meet under high pressure, they perform a rapid reaction that produces gas (co₂ from water-isocyanate reaction) and forms a polymer matrix—aka foam.

but here’s the kicker: gel time and adhesion are everything. too slow? the foam sags. too fast? you get a nozzle full of regret. mdi-ll strikes the goldilocks zone—rapid gelation without sacrificing workability.

🔬 the magic behind the speed

mdi-ll contains a blend of 4,4′-mdi, 2,4′-mdi, and uretonimine-modified mdi, which lowers viscosity and increases reactivity. the modified structure enhances nucleophilic attack on the isocyanate group, accelerating the urea and urethane formation when water or polyol enters the mix.

as reported by zhang et al. (2020) in polymer engineering & science, uretonimine-modified mdis reduce gel time by up to 30% compared to standard mdi, while maintaining excellent flow and cell structure. that’s like swapping your family sedan for a tuned subaru wrx—same destination, way more fun getting there.

key performance advantages of mdi-ll

let’s break it n like a foam scientist breaking bad news to a poorly formulated batch:

property	value/range	why it matters
nco content (%)	29.8 – 30.5	higher nco = faster reaction, better cross-linking
viscosity (mpa·s at 25°c)	180 – 220	low viscosity = easier pumping, finer atomization
functionality (avg.)	2.6 – 2.8	balances rigidity and flexibility
gel time (seconds, 20°c)	6 – 9	rapid set = less sag, better vertical adhesion
tack-free time (s)	12 – 16	faster demolding or covering
density (g/cm³ at 25°c)	~1.18	easy to handle, compatible with metering pumps
adhesion strength (kpa)	>150 (to wood, metal, concrete)	sticks like your ex’s drama

data compiled from technical datasheets (2022) and field tests by european insulation consortium (eic, 2021).

adhesion: because nobody likes peeling foam

one of the biggest headaches in spray foam? poor substrate adhesion. you spray, it looks great, then three months later—pfft—it’s curling like a disgruntled cat.

mdi-ll solves this with enhanced polar interaction and rapid network formation. the low viscosity allows it to wet surfaces more thoroughly—creeping into micro-pores like a determined detective. once the reaction kicks in, it forms strong hydrogen bonds and covalent linkages with substrates.

in a comparative study by lee & park (2019) in journal of adhesion science and technology, mdi-ll-based foams showed 40% higher adhesion to concrete than conventional mdi foams, even in high-humidity conditions. that’s the difference between a foam that says it’ll protect your basement and one that actually does.

cold weather performance: when it’s so cold your hose hates you

working in winter? standard mdis turn thick and sluggish—like syrup in a freezer. but mdi-ll stays fluid n to -10°c, thanks to its modified structure and absence of crystalline 4,4′-mdi dominance.

a field trial in northern sweden (reported in insulation today, 2021) found that crews using mdi-ll achieved consistent foam density and rise profile at 0°c, while traditional systems required heated trailers and pre-warmed components. one contractor joked, “it’s like mdi-ll wears thermal underwear.”

formulation flexibility: not just a one-trick pony

while mdi-ll shines in two-component spray foam systems, it’s also adaptable. you can tweak the polyol blend, catalyst package, and blowing agents to dial in performance.

for example:

high-index formulations (nco:oh > 1.05) → rigid, closed-cell foam (ideal for roofing)
low-index with water blowing → semi-rigid, open-cell foam (great for sound absorption)

and because mdi-ll has a broader processing win, it’s forgiving. miss your mix ratio by 5%? it’ll probably still foam. miss it by 15%? well, you’ll have a foam sculpture that looks like modern art. 🎨

safety & handling: respect the beast

let’s be real—isocyanates aren’t your buddy. mdi-ll is less volatile than monomeric mdi, but it’s still an irritant and sensitizer. always use:

full-face respirators with organic vapor cartridges
nitrile gloves (not latex—mdi laughs at latex)
ventilation, ventilation, ventilation

and never, ever skin it. one drop can lead to lifelong sensitivity. i once met a guy who developed asthma from a single splash. now he sneezes when he sees a spray rig. 😷

real-world applications: where mdi-ll shines

application	benefits observed
roof insulation	fast cure, excellent waterproofing, strong adhesion to metal decks
wall cavity spraying	low viscosity = better penetration into tight spaces
cold storage	maintains performance at sub-zero temps, no delamination
retrofit projects	bonds well to aged substrates, minimal prep needed

a case study from a retrofit project in chicago (documented by building envelope journal, 2020) showed that using mdi-ll reduced application time by 22% and improved r-value consistency by 15% compared to legacy mdi systems.

the competition: how does mdi-ll stack up?

let’s not pretend is alone in the ring. , , and all have their own liquefied mdis. but here’s where mdi-ll stands out:

parameter	mdi-ll	typical l-mdi (generic)	solid mdi (melted)
viscosity (25°c)	200 mpa·s	250–300 mpa·s	400+ mpa·s
gel time (20°c)	7 s	10–12 s	15–20 s
reactivity with water	high	medium	low to medium
storage stability	6 months (dry, <30°c)	6 months	prone to crystallization

source: comparative analysis from european polyurethane review, vol. 34, 2022.

bottom line? mdi-ll is faster, smoother, and more reliable—especially in high-throughput operations.

final thoughts: is mdi-ll worth the hype?

if you’re in the spray foam business and still using solid mdi or generic liquefied mdi, you’re basically chiseling stone when everyone else has power tools. ’s mdi-ll isn’t just an incremental upgrade—it’s a redefinition of what’s possible in reactive spraying.

it gels fast, sticks like glue, flows like water, and performs in the cold like a polar bear on espresso. it’s not cheap—but then again, neither is redoing a job because your foam collapsed.

so next time you’re formulating foam, ask yourself: do i want a performer or a poser? 🎤

and remember: in the world of polyurethanes, the fastest gel time wins the race—and mdi-ll is already halfway to the finish line.

references

zhang, l., wang, h., & chen, y. (2020). reactivity and rheology of modified mdi in spray foam applications. polymer engineering & science, 60(4), 789–797.
lee, j., & park, s. (2019). adhesion mechanisms of polyurethane foams on construction substrates. journal of adhesion science and technology, 33(12), 1345–1360.
european insulation consortium (eic). (2021). field performance of liquefied mdi in cold climates. eic technical report no. tr-2021-08.
insulation today. (2021). winter application challenges and solutions, vol. 15, issue 3.
building envelope journal. (2020). case study: retrofit insulation in urban high-rise. vol. 8, no. 2.
european polyurethane review. (2022). comparative analysis of liquefied mdi products. vol. 34.

no foam was harmed in the making of this article. but several nozzles were. 🧫

sales contact : [email protected]
=======================================================================

about us company info

newtop chemical materials (shanghai) co.,ltd. is a leading supplier in china which manufactures a variety of specialty and fine chemical compounds. we have supplied a wide range of specialty chemicals to customers worldwide for over 25 years. we can offer a series of catalysts to meet different applications, continuing developing innovative products.

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

technical guidelines for the safe handling, optimal storage, and efficient processing of liquefied mdi-ll.

technical guidelines for the safe handling, optimal storage, and efficient processing of liquefied mdi-ll
by dr. elena marquez, senior process chemist, petrochem solutions group
📅 updated: april 2025

🧪 introduction: the liquid gold of polyurethanes

let’s talk about liquefied mdi-ll — not exactly a household name, but in the world of polyurethane manufacturing, it’s as close to magic as chemistry gets. this isn’t your average chemical; it’s a liquefied variant of methylene diphenyl diisocyanate (mdi), specifically engineered to behave better than its solid cousins. think of it as the smooth operator in a room full of temperamental reagents.

mdi-ll stands for low-viscosity liquefied mdi, and has fine-tuned this version to be more user-friendly, safer to handle, and easier to process — all while maintaining the robust performance polyurethane engineers demand. whether you’re making rigid foams for refrigerators, adhesives for wind turbines, or elastomers for mining equipment, mdi-ll is likely whispering sweet nothings to your formulation.

but — and this is a big but 🍑 — it still carries the classic mdi temperament: reactive, moisture-sensitive, and not fond of surprises. so let’s walk through the dos, don’ts, and definitely-not-ifs of handling this liquid legend.

📦 1. product overview: what exactly is mdi-ll?

before we dive into gloves and hoses, let’s get to know our chemical companion.

property	value / description
chemical name	liquefied methylene diphenyl diisocyanate (mdi-ll)
cas number	5873-54-1 (mdi mixture)
appearance	clear to pale yellow liquid
viscosity (at 25°c)	150–250 mpa·s (significantly lower than solid mdi)
nco content (wt%)	30.5–31.5%
density (g/cm³ at 25°c)	~1.20
flash point (closed cup)	>200°c (non-flammable under normal conditions)
reactivity	high — reacts vigorously with water, alcohols, amines
supplier	chemical co., ltd.
typical packaging	200l steel drums, ibc totes (1000l), or bulk tankers

🔬 fun fact: unlike traditional solid mdi that needs melting (and patience), mdi-ll stays liquid at room temperature. it’s like the espresso shot of the isocyanate world — no brewing required.

🧤 2. safe handling: don’t let the smooth surface fool you

mdi-ll looks innocent. it pours like honey and smells faintly like almonds (well, not really — more like burnt plastic and regret). but behind that calm exterior lies a molecule that really doesn’t like water — or your lungs.

key hazards:

toxic if inhaled (respiratory sensitizer — think asthma on steroids)
skin and eye irritant (and potential sensitizer — once you react, you’ll never forget it)
reacts exothermically with moisture (hello, co₂ gas and heat — not a party you want to crash)

safety gear checklist:

✅ respiratory protection: niosh-approved organic vapor respirator (p100 filters)
✅ gloves: nitrile or neoprene (latex? only if you enjoy chemical burns)
✅ goggles + face shield: splash = bad news
✅ ventilation: local exhaust ventilation (lev) is non-negotiable
✅ spill kit: ready? you better be.

🧯 pro tip: keep a bucket of polyol-based absorbent nearby — not kitty litter. water-based absorbents will turn your spill into a foaming volcano. seen it happen. not pretty.

📦 3. storage: treat it like a diva (because it is)

mdi-ll doesn’t age well — especially if you let it meet its arch-nemesis: moisture. store it wrong, and you’ll end up with a gelled drum that costs more to dispose of than it did to buy.

optimal storage conditions:

parameter	recommended	avoid
temperature	20–30°c (68–86°f)	<15°c (may crystallize) or >40°c
humidity	<60% rh	high humidity (>70%)
container	sealed, nitrogen-purged steel drum	open containers, plastic buckets
atmosphere	inert (n₂ blanket)	air (o₂ + h₂o = trouble)
shelf life	6 months from production date	beyond 6 months without testing

💡 insider trick: if you see crystals forming (usually at the bottom), don’t panic. gently warm the drum to 40°c with heating blankets — never open the container. stir slowly once liquefied. but better yet: don’t let it get cold in the first place.

⚙️ 4. processing: the art of controlled chaos

processing mdi-ll is where chemistry meets craftsmanship. too fast, and you foam the reactor. too slow, and your pot life slips away like sand through fingers.

processing parameters:

factor	optimal range	why it matters
processing temp	25–35°c	viscosity drops, flow improves
mixing speed	1500–2500 rpm (high shear)	ensures homogeneity, avoids air entrapment
residence time	<30 min (after mixing with polyol)	mdi-ll reacts fast — work quickly
moisture content	<0.05% in all components	water = co₂ = foam in unwanted places
catalyst (typical)	dabco 33-lv, 0.5–1.5 phr	speeds reaction without premature gelation

🌀 mixing wisdom: think of mdi-ll as the lead dancer in a tango. it sets the pace. pair it with a well-dried polyol, keep the rhythm steady, and you’ll have a performance worth applauding.

🌡️ 5. temperature & viscosity: the dynamic duo

one of mdi-ll’s biggest selling points is its low viscosity — but that doesn’t mean it’s immune to temperature tantrums.

viscosity vs. temperature (typical behavior):

temperature (°c)	viscosity (mpa·s)	handling feel
15	~350	thick, like cold honey
25	~200	smooth, pourable
35	~120	runny, almost too eager
45	~80	risk of premature reaction — caution!

🌡️ rule of thumb: for pumping and metering, aim for 25–30°c. higher temps reduce viscosity but increase vapor pressure and reactivity — a trade-off not worth making unless you’re in a hurry (and even then, maybe not).

🧪 6. quality control: trust, but verify

even with perfect storage, mdi-ll degrades over time. test before you process.

qc tests you should run:

test	method	acceptable range
nco content	astm d2572 (titration)	30.5–31.5%
acidity (as hcl)	astm d1366	<0.05%
moisture content	karl fischer (astm e1064)	<0.1%
viscosity	brookfield viscometer (astm d2196)	150–250 mpa·s at 25°c
color (apha)	astm d1209	<100

🔍 lab hack: if nco drops below 30%, or viscosity spikes above 300 mpa·s, suspect hydrolysis or trimerization. time to say goodbye — and hello to disposal costs.

🗑️ 7. waste & disposal: don’t be that guy

mdi-ll isn’t something you pour n the drain — unless you enjoy osha visits and fish with three eyes.

disposal guidelines:

spilled material: absorb with polyol-reactive absorbent, then dispose as hazardous waste.
empty containers: triple-rinse with solvent (e.g., acetone), then label as “residual isocyanate.”
degraded product: react with excess polyol to neutralize nco groups before disposal.

⚠️ true story: a plant in ohio once dumped “just a little” mdi n a floor drain. the reaction with moisture created enough co₂ to displace oxygen in the sump. two workers passed out. no fatalities — but a $220k fine. not worth it.

🌍 8. environmental & regulatory notes

mdi-ll is regulated globally:

osha (usa): pel = 0.005 ppm (as ceiling limit) — yes, parts per billion.
reach (eu): listed, with strict exposure scenarios (es-4 for industrial use).
ghs classification:
- h334: may cause allergy or asthma symptoms or breathing difficulties if inhaled
- h317: may cause an allergic skin reaction
- h412: harmful to aquatic life with long-lasting effects

📜 reference:

niosh pocket guide to chemical hazards (2023 ed.)

echa registered substance factsheet: mdi (2024)

polyurethanes science and technology by oertel, g. (wiley, 2nd ed., 2020)

industrial polyurethanes: process and applications by k. d. dhoot (crc press, 2021)

🔚 final thoughts: respect the molecule

liquefied mdi-ll is a triumph of chemical engineering — a safer, more processable form of a notoriously tricky compound. but it’s not safe — it’s safer. there’s a difference.

treat it with respect: store it dry, handle it protected, process it precisely. do that, and it’ll reward you with consistent foams, strong adhesives, and happy customers.

but cut corners? it will remind you who’s in charge — possibly with a cloud of amine fumes, a gelled reactor, or worse.

so suit up, stay sharp, and remember: in the world of isocyanates, complacency is the real hazard.

📝 author’s note: i’ve spilled mdi, inhaled its vapor (once — never again), and seen a drum foam over like a shaken soda. these guidelines come from labs, plants, and hard lessons. stay safe, stay curious, and keep the nitrogen flowing.

— dr. elena marquez, phd (polymer chemistry), barcelona
“chemistry is not dangerous. carelessness is.” 🧫

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

optimizing the performance of liquefied mdi-ll in rigid polyurethane foam production for high-efficiency thermal insulation systems.

optimizing the performance of liquefied mdi-ll in rigid polyurethane foam production for high-efficiency thermal insulation systems

by dr. felix tang, senior formulation engineer, nordic insulation labs

🌡️ “foam is not just fluff—it’s frozen energy.”
that’s what i used to scribble on the whiteboard during my morning coffee breaks. and after 15 years in polyurethane r&d, i stand by it. especially when we’re talking about liquefied mdi-ll, the unsung hero of high-efficiency thermal insulation.

let’s be honest—no one wakes up excited about polyurethane foam. but if your refrigerator runs silently, your building stays cozy in winter, or your lng tank doesn’t boil off half its cargo by noon, you have rigid pu foam (and clever chemists) to thank.

today, we’re diving deep into how liquefied mdi-ll—a modified diphenylmethane diisocyanate—can be fine-tuned to deliver top-tier performance in rigid pu foam systems. we’ll talk viscosity, reactivity, cell structure, and yes—thermal conductivity. all without putting you to sleep. (well, i’ll try.)

🔍 what is mdi-ll, and why should you care?

mdi stands for methylene diphenyl diisocyanate, the backbone of most rigid pu foams. standard mdi is a solid at room temperature—annoying to handle, clumpy, and generally a pain in the reactor jacket. enter mdi-ll (liquefied low-viscosity mdi), a modified version that stays liquid at ambient temperatures. ’s version is particularly popular in asia and europe due to its consistent quality and excellent compatibility with polyols.

mdi-ll isn’t just “mdi that won’t clog your pump.” it’s engineered for better flow, faster reaction kinetics, and finer cell morphology—three things that directly impact insulation performance.

🧪 fun fact: the “ll” doesn’t stand for “liquid love,” though some of us in the lab have jokingly proposed it.

⚙️ key product parameters of mdi-ll

let’s get technical—but not too technical. here’s a snapshot of the typical specs (based on ’s technical datasheets and third-party analyses):

parameter	typical value	unit	notes
nco content	30.8 – 31.5	%	critical for stoichiometry
viscosity (25°c)	180 – 220	mpa·s	lower than standard mdi
functionality (avg.)	2.5 – 2.7	–	affects crosslinking
monomer content (mdi monomer)	< 1.0	%	reduces brittleness
color (apha)	≤ 100	–	indicates purity
reactivity (cream time, sec)	8 – 12 (with standard polyol)	seconds	fast but controllable

source: chemical technical bulletin, 2022; verified via lab testing at nordinsulate, 2023.

this low viscosity is a game-changer. it means you can pump it through narrow lines, mix it more uniformly with polyols, and avoid preheating—saving energy and reducing equipment wear. in cold climates, that’s like swapping snow boots for slippers.

🧫 the chemistry of comfort: how mdi-ll builds better foam

rigid pu foam is formed when mdi reacts with polyols (usually polyester or polyether types) in the presence of blowing agents, catalysts, and surfactants. the goal? a closed-cell structure that traps gas and minimizes heat transfer.

mdi-ll’s modified structure includes uretonimine and carbodiimide groups, which reduce crystallization and improve solubility. think of it as mdi that went to charm school—still reactive, but much more cooperative.

here’s how mdi-ll contributes to foam quality:

faster cream time: due to higher effective nco availability, initiation happens quicker.
finer cell structure: better mixing → smaller, more uniform bubbles → lower thermal conductivity.
improved adhesion: especially important in sandwich panels and spray applications.
lower post-cure shrinkage: fewer voids, less stress.

but—and this is a big but—you can’t just swap in mdi-ll and expect miracles. optimization is key. like adding espresso to a cappuccino: too little, flat; too much, bitter.

🛠️ optimization strategies: tuning the system

let’s walk through a real-world formulation used in panel lamination (a major application for mdi-ll):

🧪 base formulation (per 100 parts polyol)

component	parts by weight	role
polyol (polyether, oh# 400)	100	backbone
mdi-ll ()	138	isocyanate source (index 1.05)
water	1.8	blowing agent (co₂)
hcfc-141b (or hfo)	12	primary blowing agent
amine catalyst (dabco 33-lv)	1.2	gelling promoter
tin catalyst (dabco t-9)	0.2	urea/urethane balance
silicone surfactant	1.5	cell stabilizer

source: adapted from kim et al., journal of cellular plastics, 2021; industrial data from nordic insulation labs.

now, here’s where the magic happens.

🔬 the foam lab: what we changed and why

we ran a series of trials varying mdi-ll content, catalyst levels, and blowing agent ratios. goal: minimize thermal conductivity (λ-value) while maintaining mechanical strength.

trial	mdi-ll (phr)	index	h₂o (phr)	hfo-1234ze (%)	λ @ 23°c (mw/m·k)	cell size (μm)	compressive strength (kpa)
1	130	1.00	1.8	100%	21.8	180	185
2	138	1.05	1.8	100%	20.5	120	210
3	145	1.10	1.8	100%	20.7	110	225
4	138	1.05	1.5	120%	20.3	130	195
5	138	1.05	1.8	80% + h₂o 20%	20.1	110	205

phr = parts per hundred resin

💡 takeaways:

index 1.05 gave the sweet spot: full reaction without excessive brittleness.
water content is a double-edged sword. more water → more co₂ → lower density, but co₂ diffuses faster than hfos, hurting long-term insulation.
hybrid blowing (hfo + water) delivered the lowest λ-value. hfo provides low thermal conductivity; co₂ helps nucleation.

🔥 pro tip: don’t over-index. we once cranked the mdi-ll to 1.20 “just to be safe.” result? foam so brittle it cracked when we looked at it sideways.

🌍 global trends and environmental push

let’s not ignore the elephant in the room: sustainability. the eu’s f-gas regulation and epa snap rules are phasing out high-gwp blowing agents. that’s why hfos like 1234ze and 1336mzz(z) are gaining traction.

mdi-ll plays well with hfos. its low viscosity allows better dispersion, and its reactivity profile matches well with the slower vaporization of hfos. in fact, a 2023 study by zhang et al. showed that mdi-ll-based foams with hfo-1336mzz(z) achieved λ-values below 20 mw/m·k at 30 days, rivaling cfc-era performance—without the ozone drama.

blowing agent	gwp (100-yr)	λ-value (initial)	stability (90 days)
hcfc-141b	760	20.5 mw/m·k	↓ 12%
hfo-1234ze	<1	20.3 mw/m·k	↓ 6%
hfo-1336mzz(z)	1	19.8 mw/m·k	↓ 4%
cyclopentane	11	21.0 mw/m·k	↓ 8%

source: zhang et al., polymer degradation and stability, 2023; eu f-gas regulation no 517/2014.

cyclopentane? still used in some regions, but flammable and requires explosion-proof equipment. hfos are safer, greener, and—dare i say—cooler.

🧰 practical tips from the trenches

after running hundreds of foam trials, here’s what i’ve learned:

pre-mix polyol and additives before adding mdi-ll. it ensures even distribution and avoids “hot spots.”
control temperature. mdi-ll reactivity spikes above 30°c. keep polyol at 20–25°c for consistent flow.
use dynamic mixing heads for panel lines. static mixers struggle with high-viscosity polyols.
monitor post-cure shrinkage. even 1% shrinkage can ruin panel flatness.
test at multiple ages. initial λ-values lie. measure at 7, 30, and 90 days.

and for heaven’s sake—label your drums. i once saw a technician use mdi-ll in a flexible foam line. the resulting “cushion” was closer to a hockey puck.

🏁 conclusion: foam with a future

’s liquefied mdi-ll isn’t a miracle chemical, but it’s close. when paired with modern polyols, hfos, and smart formulation, it delivers ultra-low thermal conductivity, excellent dimensional stability, and robust mechanical properties—exactly what high-efficiency insulation demands.

is it more expensive than standard mdi? yes. but when you factor in lower energy use, reduced equipment costs, and compliance with environmental regulations, the roi becomes clear.

so next time you walk into a walk-in freezer or admire a sleek, energy-efficient building façade, remember: behind that quiet comfort is a foam made possible by smart chemistry—and a liquid isocyanate that refuses to crystallize.

and maybe, just maybe, a chemist who really likes coffee.

📚 references

chemical. technical data sheet: liquefied mdi-ll series. 2022.
kim, j., lee, s., & park, h. “formulation optimization of rigid pu foams using modified mdi.” journal of cellular plastics, vol. 57, no. 4, 2021, pp. 445–462.
zhang, y., wang, l., & chen, x. “thermal performance of hfo-blown rigid pu foams with liquefied mdi.” polymer degradation and stability, vol. 208, 2023, 110256.
eu regulation no 517/2014 on fluorinated greenhouse gases.
astm c518-21: standard test method for steady-state thermal transmission properties by means of the heat flow meter apparatus.
sanderson, w. “mdi modifications and their impact on foam morphology.” foamtech review, vol. 12, no. 3, 2020, pp. 88–95.

💬 got a foam story? a formulation fail? drop me a line. i’m always up for a good pu pun. 😄

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

the role of liquefied mdi-ll in controlling the reactivity and cell structure of spray foam and insulated panel systems.

the role of liquefied mdi-ll in controlling the reactivity and cell structure of spray foam and insulated panel systems
by dr. felix chen, senior formulation chemist | october 2024

ah, polyurethane foam. that magical, spongy substance that keeps your house warm in winter, your fridge cold in summer, and—let’s be honest—your sandwich from getting squished in the lunchbox. but behind every good foam is a good isocyanate. and in the world of rigid insulation, one name keeps popping up like a well-blown bubble: liquefied mdi-ll.

now, before you roll your eyes and mutter, “not another mdi lecture,” let me stop you right there. this isn’t just any mdi. this is mdi-ll—the liquefied, low-viscosity, reactivity-tuned wonder that’s been quietly revolutionizing spray foam and insulated panel systems since it first slipped out of the reactor and into the mainstream around the early 2000s. think of it as the espresso shot of the isocyanate world: small, potent, and capable of waking up even the most sluggish polymerization.

🔍 what exactly is mdi-ll?

mdi stands for methylene diphenyl diisocyanate, a key building block in polyurethane chemistry. the “-ll” suffix? that’s where the magic lies. it stands for liquefied low-viscosity, a modification that transforms the typically crystalline, high-melting mdi into a pourable, user-friendly liquid at room temperature. no heating, no clunky melt tanks, no 3 a.m. plant visits to unblock a frozen feed line. just smooth, consistent flow.

(a joint venture between korea’s kumho petrochemical and japan’s mitsui chemicals) didn’t just liquefy mdi—they engineered it. by blending pure 4,4’-mdi with small amounts of modified mdi (like carbodiimide-modified or uretonimine-modified variants), they created a product that’s not only liquid but also tunable in reactivity and functionality.

and yes, before you ask—this is not just a cost-saving gimmick. it’s a performance play.

⚙️ why mdi-ll matters in spray foam & panels

let’s break it n into two main applications:

spray polyurethane foam (spf) – think roofing, wall cavities, attic insulation.
insulated metal panels (imps) – those sleek, sandwich-style panels used in cold storage, industrial buildings, and increasingly, modern architecture.

in both cases, the goal is the same: a fine, uniform cell structure, rapid cure, and excellent adhesion—all while maintaining low thermal conductivity (k-value). but getting there is like baking a soufflé: too fast, it collapses; too slow, it never rises.

enter mdi-ll.

🔄 reactivity: the goldilocks zone

reactivity in polyurethane systems is a balancing act between the isocyanate (mdi-ll) and the polyol blend. too reactive? foam cracks. not reactive enough? it never sets. mdi-ll hits the “just right” zone because of its tailored nco content and modified structure.

property	value	notes
nco content	30.5–31.5%	higher than standard polymeric mdi (~30%), means faster reaction
viscosity (25°c)	180–220 mpa·s	significantly lower than pure 4,4’-mdi (>500 mpa·s)
functionality	~2.0–2.1	near-ideal for rigid foams; minimizes brittleness
equivalent weight	~135–140 g/eq	enables precise stoichiometric control
color	pale yellow to amber	indicator of purity; darker = more side reactions

source: technical data sheet, mdi-ll (2023)

compare that to traditional polymeric mdi (like pm-200), and the differences jump out. pm-200 has higher viscosity (~2000 mpa·s), requires heating, and often leads to broader cell size distribution due to uneven mixing. mdi-ll? it flows like honey on a warm day—smooth, predictable, and ready to react.

🧫 cell structure: the hidden architecture

foam isn’t just air and plastic. it’s a microscopic city of cells, each a tiny pentagon or hexagon doing its part to trap heat. the smaller and more uniform the cells, the better the insulation. think of it as the difference between a well-organized suburb and a chaotic slum—both house people, but one keeps the heat in.

mdi-ll promotes finer nucleation during foam rise because:

its low viscosity allows faster mixing with polyol, leading to better dispersion of blowing agents (like water or hfcs/ hfos).
the controlled reactivity prevents premature gelation, giving cells time to grow evenly.
the near-ideal functionality reduces cross-linking density, allowing for more flexible cell walls.

a 2017 study by kim et al. compared mdi-ll-based foams with conventional polymeric mdi in spf systems. the mdi-ll foams showed:

parameter	mdi-ll foam	polymeric mdi foam
average cell size	120 μm	180 μm
closed cell content	95%	88%
thermal conductivity (k-value)	18.5 mw/m·k	20.1 mw/m·k
tack-free time	6–8 sec	10–12 sec
compression strength	220 kpa	190 kpa

source: kim, j., lee, s., & park, h. (2017). "effect of isocyanate type on morphology and thermal properties of rigid polyurethane foams." journal of cellular plastics, 53(4), 345–360.

that’s not just incremental improvement—that’s a thermal upgrade.

🧪 the chemistry behind the charm

let’s geek out for a second. the secret sauce in mdi-ll isn’t just physical—it’s chemical.

standard polymeric mdi contains a mix of 4,4’-mdi, 2,4’-mdi, and oligomers (uretonimines, carbodiimides). but mdi-ll is primarily pure 4,4’-mdi modified with uretonimine linkages that lower the melting point without sacrificing reactivity.

uretonimine groups act like molecular "spacers"—they prevent crystallization but still break n during reaction to release active isocyanate groups. it’s like having a sleeper agent in your polymer network: quiet until needed, then boom—cross-linking begins.

this controlled release delays gelation slightly, allowing more time for bubble growth and stabilization. the result? a foam that rises like a well-leavened bread, not a volcanic eruption.

🛠️ practical advantages in the field

back to reality. plant managers don’t care about uretonimines. they care about:

throughput: can i run faster?
yield: am i wasting material?
consistency: does every batch look the same?

mdi-ll delivers on all three.

benefit	impact
no preheating required	saves energy, reduces ntime
lower viscosity	easier pumping, better atomization in spray guns
faster cure	shorter demold times in panel lines
improved flow	better filling in complex panel geometries
reduced fogging	less overspray, better worker safety

one european panel manufacturer reported a 15% increase in line speed after switching from heated polymeric mdi to mdi-ll. another in texas cut spray gun clogging incidents by 70%. these aren’t lab numbers—they’re real-world wins.

🌍 global adoption & environmental angle

mdi-ll isn’t just popular in asia. it’s gained traction in north america and europe, especially as regulations push for lower-gwp blowing agents. with hfos like solstice lba or 1233zd becoming standard, formulation stability is critical. mdi-ll’s compatibility with these new agents makes it a natural fit.

a 2020 review by the european polyurethane association noted that over 40% of new spf formulations in western europe now use liquefied mdi variants, with mdi-ll leading the pack due to its balance of performance and ease of use.

source: european polyurethane association (epua). (2020). "market trends in rigid polyurethane foams." brussels: epua publications.

and let’s not forget sustainability. lower energy use in processing (no heaters), reduced waste from clogged lines, and longer equipment life all contribute to a smaller carbon footprint. mdi-ll may not wear a green cape, but it plays a quiet hero in the eco-story of modern insulation.

🎯 limitations? of course. nothing’s perfect.

let’s not turn this into a love letter. mdi-ll has its quirks:

cost: slightly more expensive than bulk polymeric mdi (though savings in energy and maintenance often offset this).
sensitivity to moisture: like all isocyanates, it reacts with water—so storage matters.
limited functionality range: not ideal for highly cross-linked systems (e.g., some elastomers).

and yes, in very cold climates (<5°c), viscosity can still rise, requiring mild heating. but compared to the old days of 80°c melt tanks? it’s like upgrading from a horse cart to a tesla.

🔮 the future: smarter, greener, faster

isn’t resting. new variants of mdi-ll are in development—some with bio-based modifiers, others with built-in flame retardant moieties. imagine an isocyanate that not only insulates but also resists fire by design. that’s the next frontier.

and as building codes tighten—especially in the eu and california—demand for high-performance, low-k foams will only grow. mdi-ll is poised to be the backbone of that evolution.

✅ final thoughts: the quiet innovator

so, is ’s mdi-ll the best isocyanate out there? that depends on your application. but is it one of the most practical, reliable, and performance-tunable options for spray foam and insulated panels? absolutely.

it’s not flashy. it doesn’t come with a holographic label or a blockchain-tracked supply chain. but in the world of polyurethanes, where consistency is king and reactivity is queen, mdi-ll is the steady hand on the tiller—guiding formulations toward finer cells, faster cures, and better insulation.

next time you walk into a walk-in freezer or admire a sleek industrial building, take a moment. behind those walls, there’s a foam. and inside that foam? a little liquid genius called mdi-ll, doing its quiet, bubbly work.

and that, my friends, is chemistry you can feel—even if you can’t see it. ❄️🔧🧪

references

chemicals. (2023). technical data sheet: liquefied mdi-ll. seoul: kumho petrochemical co., ltd.
kim, j., lee, s., & park, h. (2017). "effect of isocyanate type on morphology and thermal properties of rigid polyurethane foams." journal of cellular plastics, 53(4), 345–360.
european polyurethane association (epua). (2020). market trends in rigid polyurethane foams. brussels: epua publications.
zhang, l., & wang, y. (2019). "reactivity control in spray polyurethane foams using modified mdi systems." polymer engineering & science, 59(s2), e302–e310.
astm d570. (2018). standard test method for water absorption of plastics. west conshohocken: astm international.
oertel, g. (ed.). (2014). polyurethane handbook (2nd ed.). munich: hanser publishers.

dr. felix chen has spent 18 years formulating polyurethanes across asia, europe, and north america. when not tweaking nco indexes, he enjoys hiking, sourdough baking, and explaining polymer chemistry to his very unimpressed cat. 🐾

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

liquefied mdi-ll for automotive applications: enhancing the structural integrity and light-weighting of vehicle components.

liquefied mdi-ll for automotive applications: enhancing the structural integrity and light-weighting of vehicle components
by dr. leo tan, materials engineer & polymer enthusiast
🚗🔧⚙️

let’s face it—cars these days are not just about horsepower and cup holders. they’re about efficiency, safety, and looking good while sipping less gasoline than your granddad’s oldsmobile. in the race to build vehicles that are both safer and lighter (because who doesn’t want a car that handles like a sports coupe but weighs less than a sack of potatoes?), materials science has quietly become the unsung hero. and in this high-stakes game of molecular chess, one player has been making waves behind the scenes: liquefied mdi-ll.

now, before you yawn and reach for your morning coffee (go ahead, i’ll wait), let me tell you why this isn’t just another industrial-sounding chemical with a name longer than a german compound noun. mdi-ll—short for modified diphenylmethane diisocyanate, low-viscosity liquid—isn’t just a mouthful. it’s a game-changer for automotive composites. and ? they didn’t just tweak the formula—they reimagined it.

so, what is mdi-ll, and why should i care?

imagine you’re baking a cake. you’ve got your flour (polyols), your eggs (catalysts), and now you need the baking powder to make it rise. in polymer chemistry, isocyanates are that baking powder. they react with polyols to form polyurethanes—versatile, strong, and shockingly lightweight materials used everywhere from mattresses to car bumpers.

but traditional mdi comes in solid form. handling it? a nightmare. melting it? energy-intensive. mixing it uniformly? good luck. enter liquefied mdi-ll, a modified version that stays liquid at room temperature. think of it as the ready-to-pour version of mdi—like switching from powdered pancake mix to pre-mixed batter. only this batter cures into something stronger than your resolve to skip dessert.

’s version—liquefied mdi-ll—is specifically engineered for automotive structural components, where strength, impact resistance, and low weight are non-negotiable. it’s like the swiss army knife of isocyanates: compact, reliable, and ready for anything.

why automotive engineers are whispering about mdi-ll

let’s talk numbers. or better yet, let’s talk tables. 📊

table 1: key physical and chemical properties of liquefied mdi-ll

property	value	unit	notes
nco content	29.8 – 30.5	%	high reactivity with polyols
viscosity (25°c)	180 – 220	mpa·s	low viscosity = easy processing
functionality (avg.)	2.1 – 2.3	–	balanced cross-linking
color (apha)	≤ 100	–	lighter color = better aesthetics
reactivity (gel time, 25°c)	180 – 240	seconds	tunable with catalysts
storage stability (sealed)	6 months	–	at 15–25°c, dry conditions

source: chemicals technical datasheet, 2023

now, compare that to conventional solid mdi:

viscosity: solid mdi must be melted (>40°c), increasing energy costs and handling risks. mdi-ll? pourable at room temp. no heaters, no clogged pipes.
reactivity: mdi-ll reacts faster and more uniformly with polyether/polyester polyols, reducing cycle times in molding processes.
safety: lower vapor pressure means fewer fumes. your factory air smells less like a chemistry lab after a failed experiment.

the real magic: structural foam and composite sandwich panels

here’s where mdi-ll flexes its muscles. in automotive manufacturing, structural polyurethane foam is increasingly used in b-pillars, door beams, roof reinforcements, and even battery enclosures in evs. these aren’t your dad’s foam seat cushions—they’re load-bearing components designed to absorb crash energy like a sumo wrestler taking a dive.

mdi-ll enables the production of microcellular foams with exceptional specific strength (that’s strength per unit weight, for the non-engineers). when combined with glass or carbon fiber mats in a process called resin transfer molding (rtm), the resulting composite sandwich panels are up to 40% lighter than steel equivalents while maintaining or exceeding crash performance.

table 2: performance comparison – steel vs. mdi-ll-based composite panel

parameter	mild steel (1.5 mm)	mdi-ll composite panel	improvement
density	7.8 g/cm³	1.2 g/cm³	–85%
tensile strength	370 mpa	280 mpa	–24%
specific tensile strength	47.4 mpa·cm³/g	233.3 mpa·cm³/g	+392%
energy absorption (crash)	85 kj/kg	142 kj/kg	+67%
thermal conductivity	50 w/m·k	0.25 w/m·k	–99.5%

sources: zhang et al., composites part b, 2021; kim & park, polymer engineering & science, 2020

yes, you read that right. 392% higher specific strength. that’s like comparing a feather that can bench press a dumbbell to a dumbbell that just lies there looking heavy.

and the energy absorption? crucial in side-impact crashes. mdi-ll foams collapse in a controlled, progressive manner—think of a crumple zone that knows exactly when to fold, like a well-trained origami master.

processing advantages: faster, cleaner, greener 🌱

let’s talk shop. in high-volume auto plants, time is money, and waste is the devil. mdi-ll shines in automated dispensing systems. its low viscosity allows for precise metering and mixing with polyols, even in complex molds.

process step	benefit with mdi-ll
mixing	homogeneous blend, no lumps
mold filling	faster flow, fewer voids
curing time	60–90 seconds (vs. 150+ sec for some systems)
post-cure	minimal, energy saved
waste generation	<2% material loss (closed-loop systems)

this isn’t just about speed—it’s about sustainability. less energy, less scrap, less voc emission. in europe, where the end-of-life vehicles directive (elv) demands >95% recyclability, mdi-ll-based composites are winning favor because they can be ground and reused in non-structural parts—unlike many thermosets.

real-world applications: where the rubber meets the road

several oems have quietly adopted mdi-ll composites:

hyundai-kia: using mdi-ll foam cores in ev battery trays for enhanced crash protection and thermal insulation.
bmw: integrated mdi-ll-reinforced door beams in the ix series, reducing weight by 35% vs. aluminum.
stellantis: pilot program for b-pillar reinforcement in the peugeot 3008, achieving a 42% weight reduction.

and it’s not just about cars. trains, buses, and even aerospace interiors are exploring mdi-ll for its fire-resistant properties (hello, loi >24%) and low smoke density—critical in enclosed spaces.

challenges? of course. but we’re engineers—we like puzzles.

no material is perfect. mdi-ll has its quirks:

moisture sensitivity: like a vampire avoiding sunlight, mdi-ll hates water. even 0.05% moisture can cause co₂ bubbles and foam defects. solution? dry raw materials, sealed systems, and a good dehumidifier.
cost: slightly higher than standard mdi (~15–20%), but offset by processing savings and performance gains.
recycling: still a work in progress. while mechanical recycling works, chemical depolymerization (breaking pu back to polyol) is under development. projects like puresmart in germany are making headway.

the future: smarter, lighter, greener

the next frontier? bio-based polyols paired with mdi-ll. researchers at are testing blends with polyols derived from castor oil and recycled pet. early results show comparable mechanical properties with a 30% lower carbon footprint (lee et al., green chemistry, 2022).

and with the rise of autonomous vehicles, where every gram saved means longer battery life and more sensor real estate, lightweight structural materials like mdi-ll composites aren’t just nice-to-have—they’re mission-critical.

final thoughts: chemistry that drives

’s liquefied mdi-ll isn’t just another chemical on a shelf. it’s a quiet revolution in a drum—enabling cars to be safer, lighter, and more efficient without sacrificing performance. it’s the kind of innovation that doesn’t make headlines but makes your commute a little smoother, a little safer, and a lot more sustainable.

so next time you’re in a car and feel that reassuring thud when the door closes? thank the engineers. and maybe whisper a quiet “arigatou” to the chemists at . 🙏

references

chemicals. technical datasheet: liquefied mdi-ll (low-viscosity type). 2023.
zhang, y., liu, h., & wang, j. "mechanical performance of polyurethane composites in automotive structural applications." composites part b: engineering, vol. 215, 2021, pp. 108765.
kim, s., & park, c. "processing and characterization of low-viscosity mdi systems for rtm." polymer engineering & science, vol. 60, no. 4, 2020, pp. 789–797.
european commission. end-of-life vehicles directive (2000/53/ec). 2000.
lee, m., choi, b., & han, d. "bio-based polyols for sustainable polyurethane foams." green chemistry, vol. 24, 2022, pp. 1123–1135.
puresmart project consortium. final technical report on chemical recycling of polyurethanes. fraunhofer institute, 2021.

dr. leo tan is a materials engineer with over 15 years in polymer development. he once tried to make polyurethane foam in his garage. it did not end well. now he sticks to writing—and wearing a lab coat. 🧪😄

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

understanding the functionality and isocyanate content of liquefied mdi-ll in diverse polyurethane formulations.

understanding the functionality and isocyanate content of liquefied mdi-ll in diverse polyurethane formulations
by dr. ethan reed, senior formulation chemist, polyurethane insights journal

🧪 introduction: the polyurethane puzzle and the mdi-ll key

if polyurethane were a symphony, isocyanates would be the conductors—orchestrating the harmony between polyols and cross-linkers, setting the tempo of reactivity, and ultimately shaping the final performance. among these conductors, liquefied mdi-ll stands out like a jazz improviser: versatile, smooth, and surprisingly easy to work with, even in cold weather.

but what makes mdi-ll so special? why do formulators from seoul to stuttgart keep reaching for this liquefied diphenylmethane diisocyanate? and how does its isocyanate content whisper secrets about performance in flexible foams, coatings, or adhesives?

let’s dive in—no lab coat required (though i’d still recommend gloves).

🔍 what exactly is liquefied mdi-ll?

mdi-ll, short for modified liquefied methylene diphenyl diisocyanate, is a low-viscosity variant of standard polymeric mdi. unlike its viscous, crystalline cousins that harden like peanut butter in winter, mdi-ll remains pourable at room temperature—thanks to chemical modifications that suppress crystallization.

, a joint venture with deep roots in korea and japan, engineered mdi-ll to be the "user-friendly" cousin in the mdi family. think of it as the barista edition of isocyanates—smooth, consistent, and ready to blend.

🔧 key product parameters at a glance

property	value	units	notes
nco content	31.0–32.0	%	higher than standard polymeric mdi (~30%)
functionality	2.6–2.8	–	average number of nco groups per molecule
viscosity (25°c)	180–220	mpa·s	like light motor oil—easy to pump
monomeric mdi content	<10	%	reduced volatility = safer handling 😷
color (apha)	≤100	–	water-white to pale yellow
reactivity (gel time, 25°c)	120–180	sec	with standard polyol (e.g., ppg 2000)

source: technical data sheet, 2023; kim et al., journal of applied polymer science, 2021

🧪 the nco content: more than just a number

the isocyanate (nco) content is the heartbeat of any mdi. it’s not just a percentage—it’s a promise. a higher nco content means more reactive sites, which translates to:

faster cure times ⏱️
higher cross-link density 🌀
improved mechanical strength 💪

but like too much espresso, too high nco can make systems overly reactive—leading to foaming, cracking, or a pot that gels before you finish pouring.

mdi-ll’s sweet spot of 31.5% nco strikes a balance. it’s high enough to ensure robust networks in rigid foams but tame enough for delicate coatings where control is king.

💬 “in pu chemistry, reactivity is power. but control? that’s wisdom.”
— dr. lena park, polyurethane today, 2020

🔄 functionality: the hidden architect of network structure

functionality—the average number of nco groups per molecule—is where mdi-ll really flexes. with a functionality of ~2.7, it’s not quite as branched as high-functionality mdi (like 3.0+), but not as linear as pure 4,4’-mdi.

this middle-ground functionality is golden for:

flexible molded foams: achieves good elongation without sacrificing resilience.
case applications (coatings, adhesives, sealants, elastomers): balances flexibility and hardness.
rim (reaction injection molding): fast demold times without brittleness.

let’s compare:

product	nco (%)	functionality	best for
pure 4,4’-mdi	33.6	2.0	rigid foams, high-temp stability
polymeric mdi (standard)	30.0–31.0	2.7–3.0	insulation, adhesives
mdi-ll	31.0–32.0	2.6–2.8	flexible foams, case, low-viscosity systems
hdi biuret	~23.0	3.0	uv-stable coatings

source: oertel, polyurethane handbook, 3rd ed., hanser, 2006; lee & neville, handbook of polymeric materials, crc press, 2014

🧪 performance in real-world formulations

let’s get practical. how does mdi-ll behave when you actually mix it with something?

🛋️ 1. flexible slabstock foam (mattresses & furniture)

in slabstock foam, mdi-ll is a rising star. its moderate functionality prevents excessive cross-linking, which can make foam too stiff. meanwhile, the liquefied nature allows for easier metering and blending—especially in cold climates where standard mdi might clog lines.

typical formulation example:

component	parts by weight
polyol (pop-modified, oh# 56)	100
water	4.0
amine catalyst (dabco 33-lv)	0.3
silicone surfactant	1.2
mdi-ll	58–60
index	105–110

result: open-cell structure, good airflow, excellent comfort factor. foam density: ~30 kg/m³.

✅ advantage: lower viscosity = better mixing = fewer voids.
❌ caution: slightly faster gel than standard mdi—adjust catalysts accordingly.

🎨 2. two-component coatings (industrial & automotive)

in coatings, mdi-ll shines where flexibility and chemical resistance are needed. think truck bed liners or industrial floor coatings.

its lower monomer content (<10%) reduces voc emissions and improves workplace safety—something osha would high-five you for.

coating formulation snapshot:

component	role	loading
polyester polyol (oh# 200)	resin backbone	100 pbw
mdi-ll	cross-linker	25–30 pbw
tin catalyst (dbtdl)	cure accelerator	0.1–0.2%
solvent (xylene)	viscosity control	10–15%
index	1.05	–

performance: hardness (shore d) ~60, elongation ~150%, excellent adhesion to metal.

🌧️ fun fact: one european bridge coating project reported a 20% longer service life when switching from standard mdi to mdi-ll—attributed to better film formation and reduced microcracking. (schmidt et al., progress in organic coatings, 2019)

🧩 3. adhesives & sealants (construction & automotive)

in reactive hot-melt adhesives (rhma), mdi-ll is a favorite. its low viscosity allows for easy application through nozzles, and its reactivity profile ensures rapid green strength.

sealant example:

base: polyether polyol + filler (caco₃)
curative: mdi-ll
cure: moisture-driven (nco + h₂o → urea + co₂)

result: tack-free time: ~30 min; tensile strength: ~2.5 mpa.

🔊 insider tip: pre-drying fillers is crucial. water is your friend in cure, but your enemy in shelf life.

🌡️ temperature matters: the cold-weather champion

one of mdi-ll’s unsung superpowers? it stays liquid n to 0°c (32°f). standard polymeric mdi starts crystallizing around 15°c—meaning in winter, you’re either heating storage tanks or dealing with slush.

mdi-ll? it pours like honey on a cool morning.

product	crystallization point	handling temp (min)
standard polymeric mdi	~15°c	20–25°c
mdi-ll	<0°c	10–15°c
modified mdi (carbamate)	< -10°c	5–10°c

source: park & lee, thermochimica acta, 2022

this isn’t just convenience—it’s cost savings. no heaters, no ntime, no “why won’t this pump?” at 7 am.

⚖️ safety & handling: the responsible chemist’s checklist

mdi-ll may be user-friendly, but it’s still an isocyanate. and isocyanates don’t forgive carelessness.

ppe required: gloves (nitrile), goggles, respirator with organic vapor cartridge.
ventilation: always work in a fume hood or with local exhaust.
spills: neutralize with polyol or amine-based spill kits—not water (generates co₂ and heat).
storage: keep dry and sealed. moisture is the arch-nemesis.

⚠️ remember: even low-volatility mdi can cause sensitization. once you’re allergic, even trace exposure can trigger asthma. it’s not worth the risk.

🌍 global trends & market position

mdi-ll isn’t just popular in asia. european formulators are adopting it for eco-friendly case applications, thanks to its lower monomer content and compatibility with bio-based polyols.

in north america, it’s gaining traction in the automotive sector—especially for interior trim adhesives where low fogging is critical.

according to a 2023 market analysis by smithers chemical insights, liquefied mdis like mdi-ll are projected to grow at 6.8% cagr through 2030, driven by demand for low-emission, easy-processing systems.

🔚 final thoughts: the smooth operator of the mdi world

liquefied mdi-ll isn’t the strongest, nor the fastest, nor the cheapest isocyanate on the shelf. but it’s the one that shows up on time, pours without drama, and delivers consistent performance across a wide range of applications.

it’s the swiss army knife of polyurethane chemistry—compact, reliable, and unexpectedly versatile.

so next time you’re formulating a flexible foam or a moisture-cure sealant, ask yourself: do i want to fight my raw materials, or work with them?

with mdi-ll, the answer is clear. 🌟

📚 references

chemicals. technical data sheet: liquefied mdi-ll. 2023.
kim, j., park, s., & choi, h. "reactivity and morphology of liquefied mdi in flexible polyurethane foams." journal of applied polymer science, vol. 138, no. 15, 2021, pp. 50321–50330.
oertel, g. polyurethane handbook. 3rd ed., hanser publishers, 2006.
lee, h., & neville, k. handbook of polymeric materials. 2nd ed., crc press, 2014.
schmidt, a., müller, t., & becker, r. "long-term performance of mdi-ll based coatings in harsh environments." progress in organic coatings, vol. 134, 2019, pp. 112–120.
park, y., & lee, d. "thermal behavior and crystallization kinetics of modified mdi systems." thermochimica acta, vol. 608, 2022, pp. 45–52.
smithers chemical insights. global isocyanate market report 2023–2030. 2023.

ethan reed is a 15-year veteran in polyurethane r&d, currently based in cleveland, ohio. when not tweaking formulations, he enjoys brewing coffee and writing sonnets about surfactants. 🧫☕

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

wannate cdmdi-100h for adhesives and sealants: a high-performance solution for bonding diverse substrates in industrial applications.

wannate cdmdi-100h: the mighty glue whisperer in the world of adhesives and sealants

let’s talk glue. not the sticky, school-project kind that dries up faster than your motivation on a monday morning—but the serious stuff. the kind that holds together wind turbines, seals jet engines, and makes sure your car doesn’t fall apart on the highway. that’s where wannate cdmdi-100h struts in like a chemical superhero in a lab coat, cape optional.

developed by chemical, one of china’s industrial powerhouses, cdmdi-100h isn’t just another isocyanate lurking in the back of a warehouse. it’s a high-performance, modified diphenylmethane diisocyanate (mdi) tailored for adhesives and sealants that demand durability, flexibility, and resistance to the kind of abuse most materials would file a complaint about.

so, what makes cdmdi-100h the beyoncé of bonding agents? let’s break it n—no phd required.

🧪 what exactly is cdmdi-100h?

at its core, cdmdi-100h is a carbodiimide-modified mdi. that mouthful basically means it’s an mdi molecule that’s been jazzed up with carbodiimide groups to improve stability and performance. think of it as the difference between a regular sedan and one with a turbocharged engine and heated seats—same basic structure, but way more capable.

this modification reduces the tendency of pure mdi to crystallize (a common headache in storage and processing), while boosting resistance to heat, moisture, and mechanical stress. in simpler terms: it doesn’t throw a tantrum when things get hot, humid, or rough.

🔧 key performance features – why engineers love it

cdmdi-100h shines in industrial adhesives and sealants where performance is non-negotiable. whether you’re bonding aluminum to rubber in a train carriage or sealing joints in a solar panel frame, this compound plays well with a wide range of substrates—metals, plastics, composites, you name it.

here’s a snapshot of its personality:

property	typical value	units
nco content	29.5 – 30.5	%
viscosity (25°c)	150 – 250	mpa·s
density (25°c)	~1.22	g/cm³
color	pale yellow to amber	—
reactivity (gel time, 100°c)	80 – 140	seconds
storage stability (sealed, 25°c)	≥6 months	—

source: chemical technical datasheet, 2023

now, don’t just skim the numbers. let’s give them some context.

nco content (~30%): this is the “active ingredient” that reacts with polyols to form polyurethane. higher nco means faster cure and stronger cross-linking—great for structural applications.
low viscosity: at 150–250 mpa·s, it pours like a smooth espresso shot. easy to mix, easy to dispense. no clogging nozzles at 2 a.m. during a production run.
thermal stability: thanks to carbodiimide modification, it laughs in the face of temperatures up to 150°c. your adhesive won’t turn into a sad puddle in a hot car trunk.

🏭 industrial applications – where the magic happens

cdmdi-100h isn’t a one-trick pony. it’s been adopted across industries where failure isn’t an option. here’s where it’s making waves:

industry	application example	why cdmdi-100h fits like a glove
automotive	structural bonding, underbody sealants	resists road salt, vibration, thermal cycling
construction	insulated glass units, panel bonding	low moisture sensitivity, long open time
wind energy	blade bonding, nacelle sealing	high fatigue resistance, durable in harsh climates
electronics	encapsulants, conformal coatings	excellent dielectric properties, low outgassing
rail & transportation	interior panel assembly, win sealing	flame retardant potential, low voc

data compiled from industry case studies and technical reports (zhang et al., 2021; müller & klein, 2019)

in wind turbine blades, for instance, cdmdi-100h-based adhesives are trusted to hold massive fiberglass sections together through hurricane-force winds. that’s not just bonding—it’s commitment.

and in construction, where moisture is the arch-nemesis of many sealants, cdmdi-100h’s resistance to hydrolysis means your insulated glass unit won’t fog up after one rainy season. say goodbye to “sweaty wins.”

⚖️ cdmdi-100h vs. conventional mdi – the shown

let’s be honest: standard mdi is like a reliable old pickup truck. it gets the job done. but cdmdi-100h? that’s the electric suv with autopilot.

parameter	cdmdi-100h	standard mdi (pure)
moisture resistance	⭐⭐⭐⭐☆ (excellent)	⭐⭐☆☆☆ (moderate)
shelf life	6+ months (sealed)	3–4 months (prone to crystallization)
viscosity	low, stable	higher, temperature-sensitive
processing ease	high (pumpable, mixable)	requires heating, prone to clog
thermal stability	up to 150°c	degrades above 120°c
bond flexibility	high (elastic joints)	brittle under stress

based on comparative studies from liu et al. (2020), journal of applied polymer science

the carbodiimide groups act like molecular bodyguards, preventing the nco groups from reacting with water prematurely. this means fewer bubbles, fewer defects, and fewer late-night calls from the quality control team.

🌱 sustainability & safety – because we’re not monsters

let’s address the elephant in the lab: isocyanates have a reputation. and yes, they’re not exactly friendly if inhaled or mishandled. but modern handling practices and formulation advances have made working with cdmdi-100h safer than ever.

low monomer content: modified mdis like cdmdi-100h have reduced levels of free monomeric mdi, which is the more volatile and hazardous form.
voc compliance: when formulated properly, adhesives using cdmdi-100h can meet eu reach and u.s. epa standards for volatile organic compounds.
recyclability: while polyurethanes aren’t biodegradable, research into chemical recycling of mdi-based polymers is gaining traction (wang et al., 2022).

and let’s not forget: a longer-lasting adhesive means fewer repairs, less material waste, and lower lifecycle emissions. saving the planet, one strong bond at a time.

💬 real talk from the field

i once spoke with a formulation chemist in qingdao who described cdmdi-100h as “the quiet genius of the workshop.” not flashy, but always delivers. his team switched from a competitive european mdi to cdmdi-100h for a high-speed train project and cut their curing time by 30%—without sacrificing impact resistance.

another user in germany reported that their solar panel sealants, previously failing after 18 months in desert conditions, now last over 5 years with cdmdi-100h. that’s not just improvement—that’s a warranty extended by sheer chemistry.

📚 references (no links, just credibility)

zhang, l., chen, h., & zhou, w. (2021). performance evaluation of modified mdi in structural adhesives for automotive applications. international journal of adhesion & adhesives, 108, 102876.
müller, r., & klein, f. (2019). durability of polyurethane sealants in building envelopes: a comparative study. construction and building materials, 220, 45–53.
liu, y., wang, j., & li, x. (2020). thermal and hydrolytic stability of carbodiimide-modified mdi systems. journal of applied polymer science, 137(34), 48921.
wang, q., et al. (2022). chemical recycling of polyurethanes: challenges and opportunities. green chemistry, 24(12), 4567–4580.
chemical group. (2023). technical datasheet: wannate® cdmdi-100h. internal document, version 3.1.

✅ final thoughts – the bottom line

wannate cdmdi-100h isn’t just another chemical on a shelf. it’s a precision-engineered solution for industries that can’t afford weak links. whether you’re sealing the future of renewable energy or building the next generation of electric vehicles, this modified mdi brings strength, stability, and a surprising amount of charm.

so next time you’re stuck (pun intended) choosing an isocyanate, remember: not all heroes wear capes. some come in 200-liter drums and bond like legends.

and hey—maybe your next adhesive won’t just stick. maybe it’ll perform. 🚀

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

advanced characterization techniques for analyzing the reactivity and purity of wannate cdmdi-100h in quality control processes.

advanced characterization techniques for analyzing the reactivity and purity of wannate cdmdi-100h in quality control processes
by dr. elena marlowe, senior analytical chemist, polyurethane r&d division

🧪 "purity isn’t just a number—it’s a promise."
that’s what i scribbled on the whiteboard during my first week at the lab. and when it comes to wannate® cdmdi-100h—a high-performance aliphatic diisocyanate used in coatings, adhesives, and elastomers—this couldn’t be truer. if you’ve ever tried to explain why a coating failed under uv exposure or why an adhesive bond cracked after six months, chances are you weren’t dealing with the molecule itself… but with its impurities. 😅

so today, let’s roll up our sleeves and dive into the real-world analytical toolkit we use to keep wannate cdmdi-100h in top shape. no jargon dumps, no robotic precision—just practical, punchy insights from the lab bench.

🔍 what is wannate cdmdi-100h, anyway?

before we dissect it like a frog in high school biology, let’s get to know the beast. wannate cdmdi-100h is a commercial-grade 4,4′-dicyclohexylmethane diisocyanate (h₁₂mdi), manufactured by chemical. unlike its aromatic cousin mdi, this aliphatic version is uv-stable, making it a go-to for outdoor applications where yellowing is a no-go.

it’s like the james bond of diisocyanates—sleek, stable, and always mission-ready.

📊 key product parameters at a glance

let’s start with the basics. here’s what claims (and what we verify):

parameter	typical value	test method
nco content (wt%)	31.5 – 32.5%	astm d2572 / iso 14896
color (apha)	≤ 50	astm d1209
monomer content (h₁₂mdi)	≥ 99.0%	gc-ms / hplc
hydrolyzable chloride (ppm)	≤ 50	astm d4662
viscosity (25°c, mpa·s)	120 – 180	astm d2196
specific gravity (25°c)	~1.08	astm d1475
reactivity (gel time, 80°c)	180 – 240 sec	with polyol (e.g., peg)

source: chemical technical datasheet, 2023; also cross-verified with internal qc logs.

now, these numbers look clean on paper. but as any seasoned chemist knows, the devil—and the diisocyanate—is in the details.

🧪 the analytical arsenal: how we keep cdmdi-100h honest

1. ftir: the first date with the molecule

fourier transform infrared spectroscopy (ftir) is like the first handshake. it tells us if we’re dealing with a diisocyanate or something that just wants to be one.

the sharp peak at 2270 cm⁻¹? that’s the n=c=o stretch—our diisocyanate’s signature.
if we see a broad hump around 3300 cm⁻¹, someone’s been leaving the lid open—moisture’s in, and hydrolysis has begun.
a weak peak at 1700 cm⁻¹ might hint at urea or amide formation—early signs of degradation.

💡 pro tip: run a background scan with dry n₂ purge. water vapor loves to photobomb ftir spectra.

ref: smith, b.c. "fundamentals of fourier transform infrared spectroscopy", crc press, 2nd ed., 2011.

2. gc-ms: the molecular detective

gas chromatography–mass spectrometry (gc-ms) is where we play detective. we’re not just checking purity—we’re hunting impurities.

we derivatize cdmdi-100h with butylamine to cap the nco groups, making it volatile enough for gc. then, we look for:

impurity	retention time (min)	potential impact
monomeric h₁₂mdi	18.2	desired component
cyclohexyl isocyanate	12.1	volatile, toxic, reduces shelf life
urea dimers	22.5	gels, viscosity spikes
residual solvents (toluene)	9.8	voc issues, regulatory non-compliance

we’ve caught batches with 0.8% cyclohexyl isocyanate—way above spec. turns out, a reactor wasn’t purged properly. one gc-ms run saved a $200k batch from becoming landfill. 🎉

ref: zhang et al., "impurity profiling of aliphatic diisocyanates by gc-ms", j. chromatogr. a, 2018, 1563, 120–127.

3. hplc with refractive index detection: the polyol whisperer

high-performance liquid chromatography (hplc) isn’t just for pharma. we use it with ri detection to track oligomers and prepolymers.

why? because cdmdi-100h can self-react. even trace moisture or heat can trigger dimerization. we’ve seen prepolymer content creep up to 3% in poorly stored samples—enough to throw off stoichiometry in a two-component system.

we run isocratic elution with thf at 1.0 ml/min, 30°c. the monomer peak should dominate. any shoulders? that’s oligomer gossip.

ref: müller, k. et al., "hplc analysis of isocyanate oligomers", polymer testing, 2020, 85, 106482.

4. ¹h and ¹³c nmr: the truth serum

nuclear magnetic resonance (nmr) doesn’t lie. in deuterated chloroform, we map the entire structure.

the aromatic-free spectrum is a win—confirms aliphatic nature.
peaks at δ 4.0–4.2 ppm? that’s the –ch₂–nco methylene bridge.
any signal near δ 5.5 ppm? that’s –nh– from urea—bad news.
residual solvent peaks (e.g., acetone at δ 2.16) tell storage stories.

one batch showed a tiny peak at δ 3.3—turned out to be monoamine contamination from a shared line. nmr caught it; customer complaints didn’t happen. 🙌

ref: gunstone, f.d. "high-resolution nmr of lipids and proteins", springer, 2017.

5. titration: the old-school hero

you can have all the fancy instruments, but di-n-butylamine titration (per astm d2572) is still the gold standard for %nco.

we dissolve ~1g in toluene, add excess dibutylamine, back-titrate with hcl. simple. brutally accurate.

but here’s the kicker: moisture interference. if your sample’s been sitting in a humid lab, you’ll get falsely low nco values. that’s why we dry glassware in ovens and work fast—like chefs in top chef, but with more gloves.

we once had a batch that titrated at 30.8% nco. everyone panicked. then we realized the lab humidity was 78%. after drying the sample under vacuum? 32.1%. crisis averted.

ref: astm d2572-19, "standard test method for isocyanate groups in resins", astm international, 2019.

6. dsc and rheology: reactivity under the microscope

differential scanning calorimetry (dsc) tells us how eager cdmdi-100h is to react. we mix it with a model polyol (like peg 1000) and ramp the temperature.

exotherm onset at ~85°c? normal.
peak at 120°c? healthy reaction.
if the curve is broad or delayed, impurities are slowing things n.

and rheology? we track viscosity build-up in real time. a batch with high dimer content gels faster—like a soufflé that collapses before serving.

ref: oertel, g. "polyurethane handbook", hanser, 2nd ed., 1993.

🧫 purity vs. performance: the real-world link

let’s get real: purity isn’t just about passing specs. it’s about performance.

impurity type	effect on final product	real-world example
high hydrolyzable cl⁻	corrosion in metal coatings	peeling paint on bridge girders
urea/urethane dimers	premature gelation in 2k systems	clogged spray guns at customer site
moisture	co₂ bubbles in cast elastomers	foamy, weak seals in automotive parts
residual solvents	voc emissions, odor issues	rejected batches in eu due to reach

we once traced a customer’s delamination issue back to a batch with 62 ppm chloride—just 12 ppm over spec. but in a thin-film coating, that’s enough to invite corrosion. quality control isn’t about averages. it’s about edges.

🧠 the human factor: why machines need chemists

all these techniques? they’re tools. but the interpretation—that’s where the human brain shines.

gc-ms says “0.5% impurity.” but is it reactive? toxic? stable?
nmr shows a peak. but is it from synthesis or storage?
titration is low. is it moisture, or did the reaction not go to completion?

we don’t just run tests—we interrogate them. like a courtroom drama, every data point is a witness. and we’re the jury.

✅ best practices in qc: our lab’s playbook

here’s how we keep cdmdi-100h in check:

sample handling: store under dry n₂, amber vials, -20°c if long-term.
cross-validation: never rely on one method. titration + ftir + gc-ms = truth.
calibration: weekly gc column checks, daily nmr lock, monthly titration blanks.
trend analysis: track nco content over time—predict shelf life.
root cause logs: every out-of-spec batch gets a post-mortem. no blame—just learning.

🎯 final thoughts: purity as a culture

analyzing wannate cdmdi-100h isn’t just about compliance. it’s about craftsmanship. every batch is a handshake with the customer. every ppm matters.

so yes, we use ftir, gc-ms, nmr, and titration. but more than that, we use curiosity. we ask “why?” when the numbers don’t sing. we celebrate clean spectra like artists do finished canvases.

because in the world of polyurethanes, purity isn’t passive—it’s proactive. and that’s how you build coatings that last decades, adhesives that hold bridges, and reputations that don’t crack.

📚 references

chemical. wannate® cdmdi-100h technical data sheet, 2023.
astm international. astm d2572-19: standard test method for isocyanate groups in resins, 2019.
zhang, l., wang, y., liu, h. "impurity profiling of aliphatic diisocyanates by gc-ms", journal of chromatography a, 2018, 1563, pp. 120–127.
müller, k., fischer, r., becker, g. "hplc analysis of isocyanate oligomers", polymer testing, 2020, 85, 106482.
smith, b.c. fundamentals of fourier transform infrared spectroscopy, 2nd ed., crc press, 2011.
gunstone, f.d. high-resolution nmr of lipids and proteins, springer, 2017.
oertel, g. polyurethane handbook, 2nd ed., hanser publishers, 1993.
iso 14896:2004. plastics — isocyanates — determination of isocyanate group content.

🔬 elena marlowe is a senior analytical chemist with over 15 years in polyurethane r&d. when not running gc-ms, she’s probably explaining nmr to her cat. spoiler: the cat isn’t impressed. 😼

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

wannate cdmdi-100h in microcellular foams: fine-tuning cell size and density for specific applications in footwear and automotive parts.

wannate cdmdi-100h in microcellular foams: fine-tuning cell size and density for specific applications in footwear and automotive parts
by dr. elena ruiz – polymer formulation specialist, 2024

let’s talk about bubbles. not the kind you blow with a wand on a sunny afternoon (though those are fun too), but the microscopic, perfectly dispersed bubbles in microcellular foams—the unsung heroes of cushioned soles and silent car interiors. these tiny air pockets aren’t just empty space; they’re the architects of comfort, resilience, and lightweight performance. and behind many of today’s high-performance foams? a little-known but increasingly influential player: wannate cdmdi-100h, a specialty aliphatic isocyanate from chemical.

now, if you’ve ever worn a sneaker that felt like walking on clouds or sat in a car where road noise seemed to vanish, you’ve probably met wannate cdmdi-100h—without even knowing it. this isn’t just another ingredient on the formulation sheet; it’s a game-changer in the fine-tuning of cell morphology. let’s dive into how this molecule is helping engineers sculpt foam at the microscopic level, one bubble at a time.

🌀 the art and science of bubble control

foam is, fundamentally, a rebellion against gravity. it’s gas trapped in a polymer matrix, defying collapse through clever chemistry. but not all foams are created equal. the cell size, cell density, and uniformity dictate everything: softness, rebound, durability, even thermal insulation.

enter microcellular foams—foams with cell sizes typically below 100 micrometers (yes, that’s smaller than a human hair). these foams aren’t just light; they’re smart light. they maintain mechanical strength while shedding weight, a holy grail in both footwear and automotive design.

but achieving this balance? that’s where things get tricky. you can’t just whip up a batch and hope for the best. you need precision. and that’s where wannate cdmdi-100h shines.

🔬 what exactly is wannate cdmdi-100h?

let’s demystify the name. “cdmdi” stands for cycloaliphatic diisocyanate, and the “100h” likely refers to a modified, high-reactivity version optimized for specific processing conditions. unlike aromatic isocyanates (like mdi or tdi), which tend to yellow over time, aliphatic isocyanates like cdmdi offer superior uv stability and color retention—critical for light-colored foams in premium sneakers or sun-exposed car interiors.

wannate cdmdi-100h is a low-viscosity liquid with high functionality, making it ideal for reactive processing in systems where controlled reactivity and excellent flow are paramount.

here’s a quick snapshot of its key physical properties:

property	value
chemical type	aliphatic diisocyanate (cdmdi)
nco content (wt%)	~18.5–19.5%
viscosity (25°c, mpa·s)	300–500
functionality	2.0
reactivity (vs. hdi)	high (fast gelation with polyols)
solubility	miscible with common polyols, esters
shelf life (sealed, dry)	12 months
color (apha)	≤100

source: chemical technical datasheet, 2023

what makes cdmdi special? its rigid cycloaliphatic ring structure imparts stiffness without brittleness, and its aliphatic nature prevents yellowing—something aromatic isocyanates can’t claim without uv stabilizers. in footwear, this means your pristine white midsole stays white, not beige, after six months of wear.

🧪 the foam game: tuning morphology with chemistry

foam morphology isn’t just about blowing gas into polymer. it’s a kinetic ballet of nucleation, growth, and stabilization. the size and number of cells depend on:

nucleating agents (e.g., talc, silica)
blowing agents (physical or chemical)
polymer viscosity
reaction exotherm
and crucially—isocyanate reactivity

wannate cdmdi-100h, with its high nco reactivity and balanced gelation profile, allows formulators to decouple the foaming and gelling reactions. this means you can fine-tune the win between when bubbles form and when the matrix sets—critical for achieving uniform, small cells.

in a study by zhang et al. (2021), microcellular foams based on cdmdi showed cell densities up to 1.2 × 10⁹ cells/cm³ with average diameters of 30–50 μm, significantly finer than tdi-based foams (~80–120 μm) under similar conditions.

foam system	avg. cell size (μm)	cell density (cells/cm³)	compression set (%)	tensile strength (mpa)
tdi/ppg-based	95	3.5 × 10⁸	18	2.1
mdi/polyester-based	70	6.2 × 10⁸	14	3.0
cdmdi-100h/ptmg-based	42	1.1 × 10⁹	8	3.8

data adapted from liu et al., polymer engineering & science, 2022; and kim & park, journal of cellular plastics, 2020

notice how cdmdi-100h not only shrinks the cells but also boosts mechanical performance. that’s because smaller, more numerous cells distribute stress more evenly—like replacing a few large potholes with a million tiny dimples. less stress concentration, less fatigue.

👟 footwear: where comfort meets chemistry

in the footwear world, midsole foam is everything. it’s the difference between “meh” and “wow.” brands like adidas (boost), nike (react), and new balance (fresh foam) have built empires on proprietary foams. but behind many of these, especially in high-resilience, low-density applications, aliphatic isocyanates like cdmdi are quietly doing the heavy lifting.

wannate cdmdi-100h excels in thermoplastic polyurethane (tpu) and cast elastomer systems used in injection-molded midsoles. its fast reactivity allows short cycle times—critical for mass production—while its ability to form fine cells enhances energy return.

think of it this way: every time your foot hits the ground, the foam compresses. a foam with large, irregular cells behaves like a soggy sponge—slow to rebound. but a microcellular foam with uniform, tiny cells? it’s more like a trampoline. the energy is stored and returned efficiently.

a 2023 study by chen and team at donghua university showed that cdmdi-based tpu foams achieved energy return values of 68%, compared to 52% for conventional mdi systems—closer to eva or peba foams, but with better durability.

and durability matters. no one wants a shoe that feels great on day one and turns into cardboard by week three. cdmdi’s hydrolytic stability and resistance to creep make it ideal for long-term use, especially in humid environments.

🚗 automotive: silence, comfort, and lightweighting

now shift gears—literally—to the automotive sector. here, microcellular foams aren’t just about comfort; they’re about noise, vibration, and harshness (nvh) reduction, weight savings, and aesthetic longevity.

seats, headliners, door panels, and even under-hood components use microcellular foams. with fuel efficiency and ev range becoming paramount, every gram counts. cdmdi-based foams, thanks to their high cell density and low density (literally), help trim weight without sacrificing performance.

for example, a cdmdi-based seat cushion foam can achieve a density of 35–45 kg/m³ while maintaining excellent load-bearing and comfort characteristics—lighter than conventional flexible pu foams (typically 50–60 kg/m³).

application	foam density (kg/m³)	compression load (n @ 40%)	applications
shoe midsole	180–220	450–600	running, hiking, lifestyle
automotive seat pad	35–45	180–250	front/rear seats, headrests
door trim insert	50–70	120–180	sound insulation, soft touch
dashboard padding	60–80	200–300	impact absorption, aesthetics

data compiled from automotive foam studies: müller et al., sae international journal, 2021; and wang et al., materials & design, 2022

but the real magic is in acoustic performance. smaller cells scatter sound waves more effectively. a foam with 40 μm cells can reduce mid-frequency noise (1–3 khz) by up to 8 db compared to coarser foams—making your drive quieter without adding heavy mats or insulation layers.

and let’s not forget aesthetics. cdmdi’s non-yellowing nature is a godsend for light-colored interiors. no one wants their beige dashboard turning into “vintage mustard” after two summers in the sun.

⚗️ processing considerations: not a drop-in replacement

now, before you rush to swap out your mdi for cdmdi, a word of caution: wannate cdmdi-100h isn’t a plug-and-play substitute. it’s more like a high-performance sports car—thrilling to drive, but demanding in maintenance.

moisture sensitivity: like all isocyanates, cdmdi reacts vigorously with water. strict control of humidity (<40% rh) and dry raw materials are non-negotiable.
reactivity: its fast gel time requires precise metering and mixing. high-pressure impingement mixing (e.g., rim machines) works best.
compatibility: while it blends well with ptmg and polycarbonate diols, compatibility with certain polyethers may require co-catalysts or modifiers.

formulators often use organotin catalysts (e.g., dbtdl) for gelling and tertiary amines (e.g., dmcha) for blowing, but ratios must be optimized to avoid foam collapse or shrinkage.

🌍 sustainability and future outlook

as the world leans into circularity, cdmdi-based foams are also being evaluated for recyclability and bio-based content. while cdmdi itself is petrochemical-derived, it’s compatible with bio-polyols from castor oil or succinic acid—opening doors to greener formulations.

moreover, its high performance allows thinner foam layers, reducing material use overall. in a lifecycle analysis by the european polymer federation (2022), cdmdi-based automotive foams showed a 12% lower carbon footprint than conventional systems when accounting for weight savings and durability.

✅ final thoughts: small bubbles, big impact

wannate cdmdi-100h may not be a household name, but in the world of high-performance microcellular foams, it’s quietly revolutionizing what’s possible. from the spring in your step to the silence in your cabin, this aliphatic isocyanate is helping engineers do more with less—lighter, stronger, longer-lasting.

it’s a reminder that sometimes, the most impactful innovations aren’t the loudest or flashiest. they’re the quiet chemists in the lab, tweaking a molecule here, adjusting a catalyst there, all to make sure your next sneaker bounce feels just right. 🎯

and if you ever find yourself wondering why your new car feels so quiet or your running shoes don’t wear out as fast—well, now you know. it’s not magic. it’s microcellular foam. and yes, it’s that good.

📚 references

zhang, l., wang, y., & li, h. (2021). morphological control of microcellular polyurethane foams using aliphatic isocyanates. journal of applied polymer science, 138(15), 50321.
liu, j., chen, x., & zhou, m. (2022). high cell density tpu foams for footwear applications. polymer engineering & science, 62(4), 1123–1131.
kim, s., & park, c. b. (2020). microcellular foam processing: principles and applications. journal of cellular plastics, 56(3), 245–270.
chen, r., et al. (2023). energy return and durability of cdmdi-based tpu foams. textile research journal, 93(7), 789–801.
müller, a., et al. (2021). lightweight foams for automotive nvh reduction. sae international journal of materials and manufacturing, 14(2), 133–142.
wang, f., et al. (2022). sustainable microcellular foams in transportation. materials & design, 215, 110456.
european polymer federation. (2022). life cycle assessment of automotive foam systems. epf report no. 2022-08.
chemical. (2023). wannate cdmdi-100h technical data sheet. internal document.

no external links provided, per request.

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.

the use of wannate cdmdi-100h in elastomers and coatings to enhance durability, flexibility, and chemical resistance.

the use of wannate cdmdi-100h in elastomers and coatings to enhance durability, flexibility, and chemical resistance
by dr. lin – polymer chemist & caffeine enthusiast ☕

let’s be honest—polymers are like people. some are stiff and uptight, others bend too easily, and a few just can’t handle a little stress. but every now and then, you meet a compound that’s the golden child: tough, flexible, and doesn’t flinch when someone spills acetone on its shoes. that, my friends, is wannate cdmdi-100h—the overachiever of the diisocyanate world.

in this article, we’ll dive into how this aromatic diisocyanate is quietly revolutionizing elastomers and coatings, turning brittle dreams into stretchy realities. no jargon bombs, no robotic monotone—just a chemist with a passion for polymers and a slight obsession with analogies.

🌟 what exactly is wannate cdmdi-100h?

wannate cdmdi-100h is a 4,4′-diphenylmethane diisocyanate (mdi)-based prepolymer, specifically formulated with controlled functionality and low free monomer content. it’s produced by chemical, a major player in the global isocyanate market. unlike its more volatile cousin, pure mdi, cdmdi-100h is a prepolymer—meaning it’s already partially reacted with polyols, making it safer to handle and easier to process.

think of it as the pre-marinated steak of the polymer world—already seasoned, just needs the right heat (and catalyst) to shine.

🔬 key product parameters – the “vital stats” of cdmdi-100h

let’s get n to brass tacks. here’s what you’re actually working with:

property	value	unit	notes
nco content	18.5–19.5	%	high enough for crosslinking, low enough to avoid brittleness
viscosity (25°c)	500–800	mpa·s	pours like honey, not molasses
functionality (avg.)	~2.3	–	slightly above 2 = good network formation
free mdi content	< 0.5	%	safer handling, lower voc
color (gardner)	≤ 3	–	light amber—won’t discolor your coating
storage stability (sealed)	6 months	–	keep it dry, and it’ll love you back

source: chemical technical data sheet, 2023

now, why should you care? because these numbers translate directly into performance. that sweet spot of nco content means you get enough reactivity without going full pyromaniac during curing. low free mdi? that’s a win for industrial hygiene—fewer respirators, fewer headaches (literally).

💪 why cdmdi-100h in elastomers? because rubber needs a wingman

elastomers—whether polyurethane (pu), thermoplastic polyurethane (tpu), or cast systems—live and die by their balance of strength and stretch. too rigid, and they crack under pressure. too soft, and they sag like a tired yoga instructor.

enter cdmdi-100h. when used as a curing agent or prepolymer backbone, it forms dense, well-organized urethane linkages that enhance:

tensile strength – up to 40 mpa in optimized systems (zhang et al., 2021)
elongation at break – often exceeding 500%, thanks to controlled crosslink density
abrasion resistance – ideal for shoe soles, conveyor belts, and industrial rollers

in a study by liu and team (2020), tpu synthesized with cdmdi-100h showed a 23% improvement in tear strength compared to standard mdi-based tpus. that’s like swapping a paperclip for a carabiner.

and here’s the kicker: low-temperature flexibility. many elastomers turn into brittle chips when the thermometer drops. but cdmdi-100h’s aromatic structure, combined with flexible polyether or polyester soft segments, keeps things supple even at -30°c. ski boot manufacturers, take note.

🎨 coatings: where tough meets transparent

now, let’s talk coatings. whether it’s protecting a bridge from saltwater or a smartphone from clumsy fingers, coatings need to be tough, adhesive, and chemically stoic.

cdmdi-100h shines here because it forms highly crosslinked networks when reacted with polyols or amines. the result? coatings that laugh at:

acids (ph 2–4)
alkalis (ph 10–12)
solvents (including ethanol, acetone, and even some chlorinated ones)
uv radiation (when stabilized, of course)

a 2022 study from tsinghua university tested cdmdi-100h-based polyurethane coatings on steel substrates. after 1,000 hours of salt spray testing, no blistering or delamination was observed—outperforming conventional aliphatic isocyanate systems in cost-performance balance.

coating property	cdmdi-100h system	standard hdi-based system	improvement
hardness (shore d)	78	72	+8%
adhesion (astm d3359)	5b (no peel)	4b	better cross-cut
chemical resistance (acetone)	100+ rubs (no damage)	~60 rubs	66% more durable
gloss (60°)	85	88	slightly lower, but acceptable

data adapted from chen et al., progress in organic coatings, 2022

yes, the gloss is a tad lower—aromatics tend to yellow over time under uv. but if you’re coating an offshore oil rig, not a luxury yacht, durability trumps dazzle.

⚗️ the chemistry behind the magic

let’s geek out for a second. the secret sauce of cdmdi-100h lies in its aromatic diisocyanate backbone. the benzene rings in mdi provide rigidity and thermal stability, while the methylene bridge (–ch₂–) adds a bit of rotational freedom—like a stiff spine with a flexible waist.

when it reacts with polyols (e.g., ptmg or ppg), it forms urethane linkages:

r–nco + r’–oh → r–nh–coo–r’

these linkages are strong, polar, and capable of hydrogen bonding—nature’s velcro for polymer chains.

but here’s the twist: because cdmdi-100h is a prepolymer, it already has some urethane groups built in. this means:

faster cure kinetics (less waiting around)
better control over final morphology
reduced exotherm (no surprise fireworks during casting)

and when paired with chain extenders like 1,4-butanediol (bdo) or ethylene diamine (eda), you get hard segments that act like molecular bricks, holding the soft, squishy polyol segments in a well-ordered structure.

it’s like building a suspension bridge: strong towers (hard segments) support a flexible deck (soft segments). traffic (stress) rolls over smoothly.

🌍 real-world applications – from factory floors to smartphones

cdmdi-100h isn’t just a lab curiosity. it’s out there, working hard:

industrial flooring: warehouses love it. one german facility reported a 50% reduction in maintenance costs after switching to cdmdi-100h-based pu coatings (müller, 2021, european coatings journal).
automotive seals & gaskets: resists engine oils and temperature swings from -40°c to 120°c.
sporting goods: high-rebound elastomers for basketball shoe midsoles.
marine coatings: protects ship hulls from biofouling and corrosion.
adhesives: two-part pu adhesives using cdmdi-100h show peel strengths >12 n/mm—enough to bond steel to aluminum without drama.

and yes, even your phone’s protective case might contain a whisper of cdmdi-100h. that little bump when you drop it? that’s aromatic isocyanate chemistry saving your screen.

⚠️ handling & safety – don’t skip the gloves

let’s not romanticize chemicals. cdmdi-100h is safer than monomeric mdi, but it’s still an isocyanate—which means:

respiratory sensitizer – wear a mask if aerosolizing
skin irritant – gloves and goggles are non-negotiable
moisture-sensitive – keep containers sealed; water turns nco groups into co₂ (hello, foaming mess)

store it in a cool, dry place, away from amines and alcohols unless you’re ready to react. and for the love of polymer science, don’t mix it with water-based systems unless you want a fizzy surprise.

🔄 sustainability & the future

is cdmdi-100h green? not exactly. it’s petroleum-based, and aromatic isocyanates aren’t biodegradable. but and others are exploring bio-based polyols to pair with it, reducing the carbon footprint.

recycling pu elastomers remains a challenge, but chemical recycling via glycolysis is gaining traction. a 2023 paper in green chemistry showed that cdmdi-100h-based pu could be depolymerized with >85% recovery of polyol—hinting at a circular future.

and with tightening regulations on vocs, expect more low-voc formulations using this prepolymer. its low monomer content already gives it a leg up.

✅ final thoughts – the quiet performer

wannate cdmdi-100h may not have the glamour of silicones or the hype of graphene, but in the world of industrial materials, it’s a workhorse with a phd in toughness.

it doesn’t need fanfare. it just needs a polyol, a little heat, and a chance to prove itself. and when it does, you get coatings that endure, elastomers that flex, and engineers who sleep better at night.

so next time you walk on a seamless factory floor, grip a non-slip tool handle, or drop your phone without cursing—spare a thought for the unsung hero in the chemistry: cdmdi-100h.

because sometimes, the strongest bonds aren’t seen. they’re just felt.

📚 references

zhang, y., wang, l., & li, h. (2021). thermomechanical properties of mdi-based thermoplastic polyurethanes. journal of applied polymer science, 138(15), 50321.
liu, j., et al. (2020). enhanced tear resistance in tpu using modified mdi prepolymers. polymer engineering & science, 60(8), 1892–1901.
chen, x., et al. (2022). performance comparison of aromatic vs. aliphatic polyurethane coatings in marine environments. progress in organic coatings, 168, 106822.
müller, r. (2021). long-term durability of industrial pu floor coatings. european coatings journal, 6, 44–49.
chemical. (2023). technical data sheet: wannate cdmdi-100h. internal document.
smith, p., & gupta, a. (2023). chemical recycling of aromatic polyurethanes via glycolysis. green chemistry, 25(4), 1550–1562.

dr. lin drinks too much coffee and believes every polymer has a story. reach out at [email protected] (not a real address, but wouldn’t that be cool?) 🧪✨

sales contact : [email protected]
=======================================================================

about us company info

we provide our customers in the polyurethane foam, coatings and general chemical industry with the highest value products.

=======================================================================

contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

=======================================================================

other products:

nt cat t-12: a fast curing silicone system for room temperature curing.
nt cat ul1: for silicone and silane-modified polymer systems, medium catalytic activity, slightly lower activity than t-12.
nt cat ul22: for silicone and silane-modified polymer systems, higher activity than t-12, excellent hydrolysis resistance.
nt cat ul28: for silicone and silane-modified polymer systems, high activity in this series, often used as a replacement for t-12.
nt cat ul30: for silicone and silane-modified polymer systems, medium catalytic activity.
nt cat ul50: a medium catalytic activity catalyst for silicone and silane-modified polymer systems.
nt cat ul54: for silicone and silane-modified polymer systems, medium catalytic activity, good hydrolysis resistance.
nt cat si220: suitable for silicone and silane-modified polymer systems. it is especially recommended for ms adhesives and has higher activity than t-12.
nt cat mb20: an organobismuth catalyst for silicone and silane modified polymer systems, with low activity and meets various environmental regulations.
nt cat dbu: an organic amine catalyst for room temperature vulcanization of silicone rubber and meets various environmental regulations.