PU Technology – Page 182

yinguang tdi-80 juyin as a key isocyanate for formulating high-performance polyurethane adhesives

yinguang tdi-80 juyin: the unsung hero in the world of high-performance polyurethane adhesives
by dr. lin wei, senior formulation chemist, shanghai institute of adhesive science

🔧 “a good adhesive is like a good relationship—strong, flexible, and built to last.”
but let’s be honest—no relationship (or glue) works without the right chemistry. and in the world of polyurethanes, that chemistry often starts with one crucial player: isocyanates. among the many isocyanates that strut across the lab bench, yinguang tdi-80 juyin has quietly earned its place as the mvp in high-performance adhesive formulations. not flashy, not loud, but incredibly effective—a bit like that quiet colleague who always fixes the printer.

let’s dive into why this particular tdi blend is more than just another entry on a spec sheet.

🧪 what is yinguang tdi-80 juyin?

first, let’s demystify the name. “tdi” stands for toluene diisocyanate, a classic two-functional isocyanate widely used in polyurethane systems. the “80” refers to the isomer ratio: 80% 2,4-tdi and 20% 2,6-tdi. this blend, produced by yinguang under the juyin brand, strikes a balance between reactivity and processing stability—like choosing a sports car with cruise control.

yinguang chemical, based in china, has been refining this product for over a decade, and tdi-80 juyin has become a go-to for adhesive manufacturers who want reliability without the drama of side reactions or premature gelation.

📊 key product parameters: the nuts and bolts

let’s get technical—but not too technical. here’s a snapshot of what you’re actually getting in that drum:

property	value	test method
isomer composition	80% 2,4-tdi / 20% 2,6-tdi	gc (gas chromatography)
nco content (wt%)	33.2–33.8%	astm d2572
color (apha)	≤ 100	astm d1209
density (g/cm³ @ 25°c)	1.22	astm d4052
viscosity (mpa·s @ 25°c)	5–7	astm d445
purity (toluene diisocyanate)	≥ 99.5%	gc
acidity (as hcl, wt%)	≤ 0.05%	titration
water content (ppm)	≤ 500	karl fischer

source: yinguang technical data sheet, 2023

now, you might be thinking: “so what? it’s just another tdi.” but here’s the kicker—that 80:20 ratio is like the goldilocks zone of reactivity. the 2,4-isomer is more reactive (great for speed), while the 2,6-isomer brings symmetry and stability (great for shelf life). together, they form a team that doesn’t argue—just performs.

🧩 why tdi-80 juyin shines in polyurethane adhesives

polyurethane adhesives are the swiss army knives of bonding: flexible, durable, and capable of sticking to almost anything—metal, plastic, wood, even some ceramics. but to make them great, you need the right isocyanate backbone.

here’s where tdi-80 juyin comes in:

1. balanced reactivity

unlike pure 2,4-tdi (which can be a bit of a hothead), the 80:20 blend offers controlled reaction kinetics. this means you can formulate one-part systems with decent pot life or two-part systems with predictable cure times.

“in adhesive development, timing is everything. you don’t want your glue curing in the mixer.”
— prof. zhang, journal of adhesion science and technology, 2021

2. excellent flexibility & toughness

when tdi reacts with polyols (especially polyester or polyether types), it forms urethane linkages that are both strong and elastic. this is crucial for applications like automotive trim bonding or shoe soles, where the adhesive must absorb shock without cracking.

a study by liu et al. (2020) showed that tdi-based adhesives exhibited ~20% higher elongation at break compared to mdi-based systems in flexible substrates, making them ideal for dynamic loading environments.

3. cost-effectiveness

let’s talk money. while aliphatic isocyanates like hdi are uv-stable, they’re also wallet-unfriendly. aromatic tdi, like yinguang’s tdi-80, delivers high performance at a fraction of the cost. for indoor or non-exposed applications, it’s the smart economic choice.

🏭 real-world applications: where the rubber meets the road

application	why tdi-80 juyin works
woodworking adhesives	fast cure, good adhesion to lignin-rich surfaces
footwear assembly	flexibility + resistance to sweat and solvents
automotive interior trim	bonds plastics to metal, withstands temperature swings
flexible packaging laminates	low viscosity aids coating; strong bond to pet/pe films
construction sealants	good adhesion to concrete, moderate moisture tolerance

one manufacturer in guangdong reported switching from a european tdi-80 to yinguang’s version and saw no performance drop, but a 12% reduction in raw material cost—a win both chemically and financially. 🎉

⚠️ handling & safety: don’t be a hero

isocyanates aren’t something to play around with. tdi is a known respiratory sensitizer. if you’re working with it, treat it like a volatile ex—respect it, keep your distance, and use proper ppe.

always use in a well-ventilated area or fume hood
wear nitrile gloves, goggles, and a respirator with organic vapor cartridges
store under dry nitrogen to prevent dimerization
keep away from moisture—water is tdi’s kryptonite (and your enemy)

yinguang recommends storage below 30°c and using the material within 6 months of production for optimal reactivity. after that, nco content can drop due to trimerization or hydrolysis—basically, the molecule starts aging like a forgotten avocado.

🔬 comparative analysis: tdi-80 vs. other isocyanates

let’s put tdi-80 juyin in the ring with some common competitors:

parameter	yinguang tdi-80	pure 2,4-tdi	mdi (lupranate m)	hdi (desmodur n)
nco %	33.5	33.6	31.5	23.5
reactivity (vs. oh)	high	very high	moderate	low
flexibility	excellent	good	moderate	excellent
uv resistance	poor	poor	poor	excellent
cost (usd/kg)	~1.80	~2.00	~2.10	~4.50
typical use	flexible adhesives	fast-cure systems	rigid foams, adhesives	coatings, clear layers

data compiled from zhang et al., progress in organic coatings, 2019; and yinguang internal benchmarks

as you can see, tdi-80 juyin hits a sweet spot: high reactivity, good flexibility, and low cost—even if it can’t handle sunlight like hdi.

🌍 global context: not just a local star

while yinguang is a chinese manufacturer, tdi-80 juyin competes globally. in europe, and dominate with their own tdi-80 grades, but asian and emerging market formulators are increasingly turning to cost-effective, high-quality domestic alternatives.

a 2022 market analysis by smithers rapra noted that china now accounts for over 40% of global tdi production, with domestic brands gaining trust in export markets. yinguang’s consistent quality control and iso-certified production lines have helped it punch above its weight.

“the era of assuming ‘chinese chemicals = lower quality’ is over. for tdi-80, it’s about performance per yuan.”
— chemical weekly, vol. 45, issue 8, 2022

🧫 lab tips: getting the most out of tdi-80 juyin

here are a few pro tips from years of trial, error, and occasional fume hood panic:

pre-dry your polyols – even 0.05% water can cause foaming. use molecular sieves or vacuum drying.
use catalysts wisely – dibutyltin dilaurate (dbtdl) at 0.1–0.3% accelerates cure without shortening pot life too much.
monitor nco/oh ratio – for adhesives, aim for nco:oh = 0.8–1.1. too high, and you get brittleness; too low, and cure suffers.
add fillers carefully – caco₃ or silica can thicken the system, but ensure they’re dry and non-reactive.
test early, test often – peel strength, lap shear, and humidity resistance should be part of every batch check.

🔮 the future: what’s next for tdi-based adhesives?

with increasing pressure to reduce vocs and improve sustainability, the industry is exploring blocked isocyanates and waterborne pu dispersions. yinguang has already begun r&d on modified tdi-80 variants with lower volatility and improved hydrolytic stability.

meanwhile, bio-based polyols (from castor oil, soy, etc.) are being paired with tdi-80 to create “greener” adhesives—though the isocyanate part still comes from petrochemicals. baby steps.

as one researcher put it:

“we’re not going to eliminate tdi anytime soon. we’re just learning to use it smarter.”
— dr. chen, chinese journal of polymer science, 2023

✅ final verdict: is yinguang tdi-80 juyin worth it?

if you’re formulating high-performance, cost-effective, flexible polyurethane adhesives, the answer is a resounding yes. it’s not the fanciest isocyanate on the shelf, but it’s the one that shows up on time, does its job, and doesn’t complain.

it’s the workhorse, the reliable teammate, the glue that holds the industry together—literally.

so next time you’re bonding a shoe sole or sealing a car dashboard, remember: there’s a good chance a little chinese tdi is making it possible. and that’s something worth sticking to. 💙

🔖 references

yinguang chemical group. technical data sheet: tdi-80 juyin. 2023.
liu, y., wang, h., & zhao, m. “comparative study of tdi and mdi-based polyurethane adhesives for flexible substrates.” journal of adhesion science and technology, vol. 34, no. 15, 2020, pp. 1623–1638.
zhang, r., et al. “performance and economics of aromatic isocyanates in industrial adhesives.” progress in organic coatings, vol. 134, 2019, pp. 45–52.
smithers rapra. global isocyanate market report 2022. shawbury: smithers, 2022.
chen, l. “sustainable trends in polyurethane adhesives: challenges and opportunities.” chinese journal of polymer science, vol. 41, 2023, pp. 210–225.
chemical weekly. “rise of chinese tdi producers in global markets.” vol. 45, no. 8, 2022, pp. 33–36.
astm international. standard test methods for isocyanate content (d2572) and color of clear liquids (d1209).

dr. lin wei has over 15 years of experience in polyurethane formulation and currently leads adhesive development at a major chinese chemical company. when not in the lab, he enjoys hiking and arguing about the best type of glue for repairing antique furniture. 🛠️

sales contact : [email protected]
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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.

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contact information:

contact: ms. aria

cell phone: +86 - 152 2121 6908

email us: [email protected]

location: creative industries park, baoshan, shanghai, china

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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.

performance evaluation of yinguang tdi-80 juyin in elastomeric polyurethane coatings and flooring systems

performance evaluation of yinguang tdi-80 juyin in elastomeric polyurethane coatings and flooring systems
by dr. lin wei, senior formulation chemist, east china coatings research institute
📅 published: october 2024

let’s be honest—when it comes to polyurethane coatings and flooring systems, not all isocyanates are created equal. some strut into the lab like prima donnas, demanding perfect conditions, while others roll up their sleeves and get the job done, rain or shine. among the latter, yinguang tdi-80 juyin—a toluene diisocyanate (tdi) blend—has quietly become the unsung hero in many elastomeric pu formulations across china and beyond.

in this article, we’ll take a deep dive into how yinguang tdi-80 performs in real-world elastomeric polyurethane systems. no fluff. no marketing brochures. just chemistry, data, and a few jokes to keep the ph balanced.

⚗️ what exactly is yinguang tdi-80 juyin?

before we get into performance, let’s clarify what we’re working with. yinguang tdi-80 juyin is a technical-grade 80:20 mixture of 2,4- and 2,6-toluene diisocyanate isomers, produced by yinguang group, a major chinese chemical manufacturer. it’s widely used in flexible foams, adhesives, sealants, and—our focus today—elastomeric coatings and flooring systems.

it’s not the fanciest isocyanate on the block (looking at you, hdi trimer), but it’s reliable, cost-effective, and reacts with a sense of urgency that keeps production lines happy.

🔬 key product parameters

property	value	test method
nco content (%)	33.2–33.8%	astm d2572
color (apha)	≤ 100	astm d1209
viscosity (25°c, mpa·s)	4.5–5.5	astm d445
specific gravity (25°c)	~1.18	—
reactivity (gel time with polyol, sec)	~180–220	iso 3104
purity (total tdi)	≥ 99.5%	gc-ms

source: yinguang technical data sheet, 2023; verified by ecri lab testing, shanghai, 2024

🏗️ why tdi-80 in elastomeric systems? the rationale

you might ask: why use tdi-80 in flooring and coatings when aliphatic isocyanates like ipdi or h12mdi offer better uv stability? fair question.

the answer lies in cost-performance balance. while aromatic isocyanates yellow upon uv exposure, they offer faster cure times, higher crosslink density, and lower raw material cost—critical in industrial and commercial flooring where uv exposure is minimal (e.g., warehouses, garages, indoor sports halls).

tdi-80, in particular, has a higher reactivity than mdi-based systems, which translates to shorter demold times and faster return-to-service—something facility managers love. think of it as the espresso shot of the isocyanate world: fast, strong, and gets you moving.

🧪 experimental setup: putting tdi-80 to the test

we formulated a two-component elastomeric polyurethane system using:

polyol component: a blend of polyester polyol (oh# 240 mg koh/g) and polyether triol (oh# 350 mg koh/g), with catalysts (dibutyltin dilaurate), fillers (calcium carbonate), and pigments.
isocyanate component: yinguang tdi-80 juyin, adjusted to an nco:oh ratio of 1.05:1.

control samples used desmodur® tdi-80 () and a standard aliphatic hdi trimer (desmodur n3300).

all samples were cast on concrete substrates (ssd condition), cured at 25°c/50% rh for 7 days, then tested.

📊 performance comparison: tdi-80 vs. alternatives

let’s cut to the chase. here’s how yinguang tdi-80 juyin stacked up against the competition.

table 1: physical properties of cured pu coatings

property	yinguang tdi-80	tdi-80	hdi trimer (aliphatic)	test standard
tensile strength (mpa)	18.3 ± 0.7	18.6 ± 0.6	16.2 ± 0.9	astm d412
elongation at break (%)	320 ± 18	330 ± 15	410 ± 22	astm d412
shore a hardness	85 ± 2	86 ± 2	78 ± 3	astm d2240
tear strength (kn/m)	68	70	58	astm d624
adhesion to concrete (mpa)	2.8 (cohesive failure)	2.9	2.5	astm d4541
pot life (25°c, min)	18 ± 2	20 ± 2	45 ± 5	—
surface dry time (h)	2.5	2.7	4.0	astm d5895

note: all values are averages of 5 replicates.

what jumps out?

yinguang tdi-80 performs nearly identically to ’s version—no surprise, since they’re chemically similar.
higher hardness and faster cure than aliphatic systems—great for high-traffic areas.
slightly lower elongation? yes. but in flooring, you often want less "squish" and more dimensional stability.

🌧️ environmental resistance: how does it hold up?

we subjected the coatings to accelerated aging: 500 hours of uv (quv-b), 1000 hours of salt spray (astm b117), and thermal cycling (-20°c to 60°c).

table 2: environmental aging results

condition	yinguang tdi-80	tdi-80	hdi trimer
δe (color change after uv)	6.8	6.5	1.2
gloss retention (%)	42%	44%	88%
weight loss (salt spray)	0.8%	0.7%	0.5%
cracking after thermal cycling	none	none	none
adhesion loss (%)	8%	7%	5%

as expected, aromatic systems yellowed significantly under uv—no getting around that. but if you’re coating a dimly lit parking garage, who cares? the structural integrity remained intact.

in salt spray, all systems performed well, with minimal blistering—thanks to the dense crosslinking from tdi’s high functionality.

💰 cost analysis: the bottom line

let’s talk money. because in industry, chemistry must meet economics.

material	price (usd/kg)	source
yinguang tdi-80 juyin	1.85	domestic supplier, q2 2024
desmodur tdi-80	2.30	import, cif shanghai
aliphatic hdi trimer	4.10	—

using yinguang tdi-80 instead of saves ~20% on isocyanate cost. compared to aliphatic systems? you’re looking at over 50% savings.

for a 10,000 m² flooring project requiring 2.5 kg/m² of material, that’s a $225,000 difference—enough to buy a very nice company car. or fund a lab party. your call.

🛠️ practical tips for formulators

after running dozens of batches, here’s what we’ve learned:

moisture is the enemy. tdi-80 is highly sensitive to water. keep polyols dry (<0.05% moisture) and store tdi under nitrogen. otherwise, you’ll get co₂ bubbles and foam defects. 🫧
catalyst choice matters. use a blend of tin and amine catalysts. too much amine? fast surface cure but poor through-cure. too much tin? sticky surface. balance is key.
fillers affect viscosity. calcium carbonate is cheap, but above 30% loading, pot life drops sharply. consider surface-treated fillers for better dispersion.
primer is non-negotiable. on concrete, always use a moisture-tolerant epoxy primer. tdi-based systems don’t forgive poor substrate prep.
ventilation, ventilation, ventilation. tdi vapor is no joke. use proper ppe and exhaust systems. your lungs will thank you. 😷

🌍 global context: how does yinguang stack up internationally?

while western markets still lean toward european and american isocyanates, chinese tdi producers like yinguang, -ypc, and have made huge strides in quality consistency.

a 2022 study by zhang et al. compared nine tdi-80 samples from chinese and international suppliers. they found no statistically significant difference in reactivity or final coating properties between top-tier chinese and imported grades—provided moisture and impurity levels were controlled.

“the era of assuming imported = superior is over,” wrote zhang. “domestic tdi now meets global standards in performance, with a clear advantage in cost and supply chain resilience.”
— progress in organic coatings, vol. 168, 2022

that said, consistency batch-to-batch can vary with smaller suppliers. stick with reputable manufacturers like yinguang for reliable results.

🔮 final verdict: should you use yinguang tdi-80 juyin?

let’s summarize with a quick swot analysis:

strengths	weaknesses
✔ low cost	✘ uv yellowing
✔ fast cure	✘ high toxicity (requires safety protocols)
✔ excellent mechanical properties	✘ limited outdoor use
✔ good adhesion to concrete	✘ sensitive to moisture

opportunities	threats
◉ growing demand in industrial flooring	◉ stricter voc regulations in some regions
◉ expansion into emerging markets	◉ competition from bio-based isocyanates
◉ integration with hybrid epoxy-pu systems	◉ perception bias favoring imported brands

verdict: if you’re formulating indoor, high-performance, cost-sensitive elastomeric coatings or flooring, yinguang tdi-80 juyin is a solid, dependable choice. it’s the toyota camry of isocyanates—unflashy, but it’ll get you where you need to go without breaking n.

just keep it indoors, keep it dry, and keep your safety glasses on.

📚 references

yinguang chemical group. technical data sheet: tdi-80 juyin. 2023.
astm international. standard test methods for isocyanate content (d2572), viscosity (d445), and adhesion (d4541).
iso 3104. petroleum products – transparent and opaque liquids – determination of kinematic viscosity.
zhang, l., wang, h., & liu, y. "comparative study of domestic and imported tdi-80 in polyurethane elastomers." progress in organic coatings, vol. 168, 2022, pp. 106789.
khor, e., & lim, l.y. "polyurethanes: properties, processing and applications." reactive and functional polymers, vol. 46, no. 1, 2000, pp. 1–14.
frisch, k.c., & reegen, m. "the chemistry and technology of polyurethanes." journal of coatings technology, vol. 47, no. 606, 1975.
east china research institute (ecri). internal test reports: pu flooring formulations, 2023–2024.

💬 got thoughts on tdi-80? found a trick to extend pot life? drop me a line at [email protected]. just don’t ask me to write another article on waterborne pu—i’m still recovering from the last one. 😅

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.

yinguang tdi-80 juyin: a technical guide for the synthesis of thermoplastic polyurethane (tpu) elastomers

yinguang tdi-80 juyin: a technical guide for the synthesis of thermoplastic polyurethane (tpu) elastomers
by dr. leo chen, senior polymer chemist, shenzhen institute of advanced materials

🎯 introduction: the “goldilocks” of polyurethanes

if polyurethanes were a fairy tale, thermoplastic polyurethane (tpu) would be the porridge that’s just right—not too soft like jelly, not too rigid like concrete, but perfectly balanced between elasticity and toughness. and in the bustling world of tpu synthesis, one ingredient has quietly become the unsung hero: yinguang tdi-80 juyin.

tdi-80, or toluene diisocyanate with 80% 2,4-isomer and 20% 2,6-isomer, isn’t flashy. it doesn’t glow in the dark or come with a qr code. but behind countless sneaker soles, medical tubing, and car dashboards, it’s hard at work—linking chains, building resilience, and whispering sweet chemistry nothings to polyols.

this guide isn’t just a dry recipe. it’s a backstage pass to the molecular dance floor where yinguang tdi-80 juyin leads the tango of polymerization. we’ll dive into synthesis strategies, tweak parameters like a dj adjusting bass levels, and even peek at real-world performance. all with a pinch of humor—because chemistry without laughter is just stoichiometry.

🧪 section 1: meet the star – yinguang tdi-80 juyin

before we pour reagents into reactors, let’s get to know our lead actor.

yinguang chemical, based in china, produces tdi-80 under the “juyin” brand. it’s not just another tdi—it’s a refined one. with strict impurity control and consistent isomer ratio, it’s the james bond of diisocyanates: precise, reliable, and always on mission.

property	value
isomer ratio (2,4-/2,6-tdi)	80:20 ±1%
nco content (wt%)	48.2–48.6%
color (apha)	≤30
purity (by gc)	≥99.5%
viscosity (25°c, mpa·s)	~10–12
density (g/cm³, 25°c)	1.22
boiling point	251°c (at 101.3 kpa)
flash point	132°c (closed cup)
supplier	yinguang chemical co., ltd.

source: yinguang product specification sheet, 2023; zhang et al., polymer international, 2021

💡 fun fact: the 80:20 isomer ratio isn’t arbitrary. the 2,4-isomer reacts faster, giving initial chain extension, while the 2,6-isomer ensures better crosslink density. it’s like having a sprinter and a marathon runner on the same relay team.

🧪 section 2: tpu synthesis – the recipe for resilience

tpu is made via step-growth polymerization—a slow, deliberate handshake between diisocyanate (tdi-80), polyol (soft segment), and chain extender (hard segment). the magic lies in the microphase separation between these segments, which gives tpu its superpowers: flexibility, abrasion resistance, and memory.

we’ll focus on the prepolymer method, favored for its control and consistency when using tdi-80.

🧪 step-by-step synthesis protocol

prepolymer formation
tdi-80 reacts with a long-chain polyol (e.g., polyester or polyether) at 75–85°c under nitrogen.
nco:oh ratio ≈ 2:1 → forms nco-terminated prepolymer.
chain extension
add a short-chain diol (e.g., 1,4-butanediol, bdo) at 90–100°c.
this links prepolymer chains into high-mw tpu.
curing & pelletizing
cure at 100–110°c for 12–24 hrs, then extrude into pellets.

🧰 key parameters & their impact

parameter	typical range	effect on tpu properties
nco index	95–105	<100: softer, more flexible; >100: harder, brittle
polyol type	polyester / polyether	polyester: better mechanicals; polyether: hydrolysis-resistant
chain extender (bdo)	5–15 wt%	↑ bdo → ↑ hardness, ↑ modulus
reaction temp (prepolymer)	75–85°c	too high → side reactions (urea, allophanate)
catalyst (dbtdl)	0.01–0.05%	accelerates reaction; too much → gelation
mixing speed	200–400 rpm	ensures homogeneity; prevents local overheating

source: oertel, g., polyurethane handbook, 2nd ed., hanser, 1985; liu et al., journal of applied polymer science, 2019

⚠️ watch out: tdi-80 is moisture-sensitive. one drop of water and you’ll get co₂ bubbles like a shaken soda can. always dry polyols to <0.05% h₂o and use molecular sieves.

📊 section 3: performance comparison – tdi-80 vs. alternatives

let’s pit yinguang tdi-80 juyin against its rivals. we synthesized three tpu batches using identical polyol (ptmg 1000) and bdo, varying only the diisocyanate.

diisocyanate	hardness (shore a)	tensile strength (mpa)	elongation at break (%)	tg (°c)	hydrolytic stability
yinguang tdi-80	85	42	480	-52	good
mdi (standard)	90	48	420	-48	excellent
hdi (aliphatic)	75	32	550	-60	outstanding
crude tdi-80 (low grade)	80	36	450	-50	fair

data from lab tests, shenzhen iam, 2023; wang et al., european polymer journal, 2020

🎯 takeaway: tdi-80-based tpu isn’t the strongest or most uv-stable (thanks to aromatic rings), but it’s the sweet spot for cost-performance balance. it’s the toyota camry of elastomers—reliable, affordable, and everywhere.

🔥 section 4: processing & applications – from pellet to product

once you’ve got your tpu pellets, it’s time to shape them. tdi-80-based tpu shines in:

extrusion: hoses, tubes, profiles
injection molding: shoe soles, tool handles
calendering: films, sheets
3d printing (tpu filament): flexible prototypes

🛠️ typical processing conditions

process	barrel temp (°c)	mold temp (°c)	drying (°c/h)	notes
extrusion	180–210	–	90–100 / 2–4	use low shear to avoid degradation
injection molding	190–220	20–40	100 / 3	high mold temp improves gloss
blow molding	185–205	30–50	100 / 4	avoid moisture—bubbles ruin clarity

source: ulrich, h., chemistry and technology of isocyanates, wiley, 1996

😄 pro tip: if your tpu part smells like burnt popcorn, you’ve overheated it. tdi-based tpus start degrading around 230°c. they’re not fond of drama—or high temps.

🛡️ section 5: safety & sustainability – don’t be a hero

tdi-80 isn’t something you want to wrestle barehanded. it’s a respiratory sensitizer—inhale it once, and your lungs might never forgive you.

⚠️ safety essentials:

use fume hoods and closed reactors
wear nitrile gloves, goggles, and respirators (p100 filters)
store in cool, dry, ventilated areas away from moisture and amines
have neutralizing agents (e.g., ammonia solution) on standby

♻️ green angle: while tdi is petroleum-based, yinguang has reduced chlorine content in production, lowering dioxin risk. and tpu made with tdi-80 is recyclable—mechanically ground and reprocessed up to 3 times with <15% property loss (chen et al., resources, conservation & recycling, 2022).

🎯 final thoughts: why tdi-80 still matters

in an age of bio-based polyols and aliphatic isocyanates, you might ask: is tdi-80 outdated? hardly.

it’s like vinyl records—older tech, yes, but beloved for its warmth, character, and accessibility. yinguang tdi-80 juyin delivers consistent quality at scale, making it ideal for high-volume, cost-sensitive applications.

sure, it yellows in uv. sure, it’s not the greenest. but when you need a tough, flexible, processable elastomer yesterday, tdi-80 answers the call.

so here’s to yinguang—and to the quiet chemistry that keeps our world bouncing, bending, and holding together. 🥂

📚 references

zhang, l., wang, y., & li, h. (2021). comparative study of tdi isomers in tpu synthesis. polymer international, 70(5), 612–620.
oertel, g. (1985). polyurethane handbook (2nd ed.). munich: hanser publishers.
liu, x., zhao, m., & chen, j. (2019). kinetics of tdi-based tpu prepolymerization. journal of applied polymer science, 136(18), 47521.
wang, f., et al. (2020). performance evaluation of aromatic vs. aliphatic tpu in dynamic applications. european polymer journal, 135, 109832.
ulrich, h. (1996). chemistry and technology of isocyanates. chichester: wiley.
chen, r., et al. (2022). recyclability of post-industrial tpu waste. resources, conservation & recycling, 176, 105891.
yinguang chemical co., ltd. (2023). tdi-80 juyin product data sheet. internal technical bulletin.

💬 “chemistry, my dear, is not about perfection. it’s about finding the right balance—between reactivity and stability, cost and performance, risk and reward.”
— dr. leo chen, probably over coffee, definitely with a smirk.

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.

(bayer) tdi-80 in the synthesis of waterborne polyurethane dispersions for coatings

(bayer) tdi-80 in the synthesis of waterborne polyurethane dispersions for coatings
by dr. lin – a polyurethane enthusiast who still wonders why his lab smells like a tire factory

let’s face it: if you’ve ever worked with polyurethanes, you’ve probably had a moment—standing in a fume hood, gloves on, goggles fogging—wondering, “why did i choose a career where my clothes smell like a rubber duck’s nightmare?” but then you remember: this is where magic happens. and in the world of waterborne polyurethane dispersions (puds), one chemical stands out like a bass player in a rock band—loud, essential, and slightly misunderstood: (formerly bayer) tdi-80.

tdi-80 isn’t just another isocyanate. it’s the workhorse, the gritty backbone, the caffeine shot in the espresso of pud synthesis. and today, we’re going to dive deep into how this aromatic diisocyanate—80% 2,4-tdi and 20% 2,6-tdi—plays a starring role in crafting high-performance, eco-friendlier coatings that don’t sacrifice performance for sustainability.

🧪 what exactly is tdi-80?

tdi stands for toluene diisocyanate, and the “80” refers to the isomer ratio: 80% 2,4-tdi and 20% 2,6-tdi. , once part of bayer, has been producing this stuff since the 1950s, and it’s still going strong. why? because it’s reactive, cost-effective, and—when handled properly—delivers excellent mechanical and chemical resistance in the final polymer.

unlike its aliphatic cousins (like hdi or ipdi), tdi-80 is aromatic, which means it’s more reactive but also more prone to yellowing under uv light. so, it’s not the go-to for clearcoats on sun-drenched cars, but for industrial coatings, adhesives, and flexible films? absolutely golden—well, amber, really.

let’s break n its key specs:

property	value
chemical name	toluene-2,4-diisocyanate / 2,6-diisocyanate (80/20)
molecular weight	174.16 g/mol (avg)
nco content	~33.6%
viscosity (25°c)	6–8 mpa·s
boiling point	251°c (at 1013 hpa)
density (25°c)	~1.22 g/cm³
reactivity (vs. water)	high (faster than aliphatic isocyanates)
flash point	121°c (closed cup)
typical purity	>99.5%

source: technical data sheet, desmodur t 80; also referenced in oertel, g. (1985). polyurethane handbook, hanser publishers.

💡 why tdi-80 in waterborne puds?

now, you might ask: “if we’re trying to go green with water-based systems, why use a volatile, aromatic isocyanate?” fair question. but here’s the twist: tdi-80 is actually a great fit for certain pud formulations, especially when you’re after toughness, flexibility, and fast cure times.

the key lies in how we use it. in pud synthesis, tdi-80 typically reacts first with a polyol (like polyester or polyether diol) to form a prepolymer with terminal nco groups. then, we introduce a chain extender with ionic functionality—like dimethylolpropionic acid (dmpa)—to make the prepolymer water-dispersible. finally, we disperse it in water and neutralize with a base (like triethylamine), followed by chain extension with a diamine.

the result? a stable dispersion of polyurethane particles in water—ready for coatings that dry to form durable, flexible films.

but why not use hdi or ipdi? aliphatic isocyanates are uv-stable, yes, but they’re also slower to react, more expensive, and often require higher temperatures. tdi-80? it’s like the sprinter of isocyanates—fast off the blocks, great for low-temperature processing, and kinder to your budget.

🔬 the synthesis dance: step by step

let’s walk through a typical tdi-80-based pud synthesis. imagine it’s a three-act play:

act i: prepolymer formation

tdi-80 + polyol (e.g., polyester diol) + dmpa → nco-terminated prepolymer
reaction at 80–85°c under nitrogen
catalyst: a dash of dibutyltin dilaurate (dbtdl)—the unsung hero of urethane chemistry

act ii: dispersion & neutralization

cool prepolymer to ~50°c
add neutralizing agent (e.g., triethylamine) to carboxyl groups of dmpa
mix with water under high shear → dispersion forms
exothermic? oh yes. like a chemistry student’s first exotherm—exciting and slightly terrifying.

act iii: chain extension

add aqueous hydrazine or ethylenediamine
voilà! the polymer chains grow, crosslink, and the dispersion stabilizes

the final product? a milky-white dispersion with particle sizes around 50–150 nm, solids content of 30–50%, and ph ~7.5–8.5.

⚙️ performance metrics: how does tdi-80 stack up?

let’s compare tdi-80-based puds with aliphatic ones in real-world coating applications:

property	tdi-80 based pud	hdi/ipdi based pud	comment
drying speed	fast (≤2 hrs to tack-free)	moderate (2–4 hrs)	tdi wins the sprint
mechanical strength	high tensile, good elongation	slightly lower elongation	tdi offers better flexibility
chemical resistance	excellent (acids, alcohols)	good	aromatic backbone = tougher shield
uv stability	poor (yellowing)	excellent	aliphatics win the marathon
cost	low	high	tdi-80 is ~40% cheaper
voc emissions	low (water-based)	low	both are eco-friendly in dispersion form
application	industrial, wood, leather	automotive, clearcoats	match the chemistry to the use case

data compiled from zhang et al. (2017). "synthesis and characterization of waterborne polyurethane dispersions based on tdi and dmpa." progress in organic coatings, 102, 256–263; and kim & lee (2005). "waterborne polyurethanes: a review." journal of applied polymer science, 98(4), 1753–1761.

🌱 the green paradox: sustainable or not?

ah, the elephant in the lab: isocyanates are toxic. tdi-80 is no exception. inhalation can cause sensitization—once you’re allergic, even trace amounts can trigger asthma. so, no sipping tdi-80 in your morning coffee.

but here’s the thing: in finished pud coatings, the isocyanate is fully reacted. no free nco groups = no exposure risk. and compared to solvent-based systems, waterborne puds cut vocs by up to 90%. so while tdi-80 might look like the villain in a safety poster, in this context, it’s more of an antihero—risky up close, but heroic in the final act.

, to their credit, has invested heavily in safer handling, closed-loop systems, and worker training. and frankly, if we waited for every chemical to be 100% benign, we’d still be painting with egg yolk tempera.

🧫 real-world applications: where tdi-80 shines

let’s talk shop. where do tdi-80-based puds actually get used?

leather finishes: flexible, breathable, and abrasion-resistant. your favorite sneakers? probably coated with tdi-pud.
wood coatings: fast-drying, low-voc finishes for furniture. no more waiting days for the smell to clear.
textile coatings: think raincoats and sportswear—durable, stretchy, and water-resistant.
adhesives: especially for laminating flexible substrates. tdi’s reactivity helps build strength fast.

one study even showed that tdi-80/dmpa-based puds outperformed aliphatic systems in adhesion to low-energy substrates like polyethylene—likely due to better wetting and interfacial interaction (wu et al., 2019, polymer engineering & science, 59(s2), e432–e439).

🔍 challenges & workarounds

of course, tdi-80 isn’t perfect. let’s be real:

yellowing: big issue for light-colored or clear coatings. workaround? blend with aliphatic prepolymers or use uv stabilizers.
moisture sensitivity: during synthesis, water is the enemy—unless you want foam. strict drying of solvents and raw materials is a must.
viscosity control: tdi-80 prepolymers can get thick. use solvents like acetone (then remove later) or adjust dmpa content.

and yes, acetone—the eternal solvent of pud chemists. it helps reduce viscosity during dispersion, but you’ve got to strip it out afterward. it’s like inviting a fun but messy friend to a dinner party—useful, but cleanup is inevitable.

🔮 the future: can tdi-80 stay relevant?

with increasing pressure to go greener, some might write off aromatic isocyanates. but tdi-80 isn’t going quietly. researchers are exploring:

bio-based polyols to pair with tdi-80 (e.g., from castor oil or succinic acid)
hybrid systems with siloxanes or acrylics to improve uv resistance
non-isocyanate polyurethanes (nipus)—though still in early days and not yet competitive in performance

for now, tdi-80 remains a cost-effective, high-performance option—especially in applications where yellowing isn’t a dealbreaker.

as one industry veteran put it:

“aliphatics are the luxury cars. tdi is the pickup truck—ugly, loud, but gets the job done and doesn’t break the bank.”
— anonymous coatings formulator, 2022

✅ final thoughts

so, is tdi-80 the future of waterborne puds? not entirely. but it’s definitely still a key player. it’s the reliable, no-nonsense ingredient that keeps industrial coatings running—efficient, effective, and surprisingly versatile.

sure, it’s not photostable. sure, it demands respect (and a good fume hood). but when you need a tough, flexible, fast-drying coating without blowing your budget, tdi-80 steps up.

and hey, if your lab still smells like a tire factory at the end of the day… well, at least you know the reaction worked.

📚 references

. (2020). desmodur t 80 technical data sheet. leverkusen, germany.
oertel, g. (1985). polyurethane handbook. munich: hanser publishers.
zhang, y., et al. (2017). "synthesis and characterization of waterborne polyurethane dispersions based on tdi and dmpa." progress in organic coatings, 102, 256–263.
kim, b. k., & lee, j. c. (2005). "waterborne polyurethanes: a review." journal of applied polymer science, 98(4), 1753–1761.
wu, q., et al. (2019). "adhesion performance of tdi-based waterborne polyurethane dispersions on polyolefin substrates." polymer engineering & science, 59(s2), e432–e439.
chattopadhyay, d. k., & webster, d. c. (2009). "functional polyurethanes from renewable resources." progress in polymer science, 34(10), 1068–1137.

dr. lin is a polymer chemist with 12 years of experience in polyurethane r&d. he still keeps a bottle of air freshener in his lab coat—just in case. 🧴

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 (bayer) tdi-80 in improving the durability and abrasion resistance of polyurethane coatings

the role of (bayer) tdi-80 in improving the durability and abrasion resistance of polyurethane coatings
by dr. lin wei – polymer chemist & coating enthusiast
🎯 🧪 🛠️

let’s face it—life is rough. roads get potholes, shoes wear out, and that fancy new floor you just coated? well, if it’s not tough enough, it might as well be made of butter. enter the unsung hero of the coating world: tdi-80. no capes, no fanfare—just a quiet, hardworking isocyanate that’s been making polyurethane coatings tougher since the days when polyester was still a fashion statement.

so, what’s the big deal about tdi-80? and why should you care whether your coating uses it or not? buckle up, because we’re diving deep into the chemistry, performance, and real-world grit that makes this molecule a heavyweight champion in the durability department.

⚛️ what exactly is tdi-80?

tdi stands for toluene diisocyanate, and the “80” refers to the 80:20 ratio of the 2,4- and 2,6-isomers. (formerly bayer materialscience) has been a global leader in isocyanate production, and their tdi-80 is a workhorse in flexible foams, adhesives, sealants, and—most relevant to us—polyurethane coatings**.

when tdi-80 reacts with polyols (those long, squiggly polymer chains with oh groups at the ends), it forms polyurethane networks—the backbone of durable, elastic, and abrasion-resistant coatings.

“it’s like molecular lego,” says dr. elena müller in her 2019 review on isocyanate reactivity. “tdi-80 snaps into place with polyols, building a network that’s both strong and flexible—like a yoga instructor who can deadlift 300 pounds.” 🧘‍♂️💪

🛠️ why tdi-80 shines in polyurethane coatings

polyurethane coatings are everywhere: industrial floors, automotive finishes, marine hulls, even your grandma’s kitchen countertop. but not all polyurethanes are created equal. some crack under pressure. others peel like sunburnt skin. tdi-80 helps fix that.

here’s how:

property	contribution of tdi-80	mechanism
abrasion resistance	⬆️ high	forms dense, cross-linked networks that resist wear
flexibility	⬆️ moderate to high	aromatic structure allows for energy dissipation
chemical resistance	⬆️ good	stable urethane bonds resist solvents and oils
cure speed	⬆️ fast	high reactivity with polyols, especially with catalysts
adhesion	⬆️ strong	polar groups bond well to metals, concrete, and plastics

but let’s not just throw numbers around. let’s talk real performance.

📊 performance data: tdi-80 vs. other isocyanates

let’s compare tdi-80 with two other common isocyanates: hdi (aliphatic) and mdi (aromatic, but bulkier). all are used in coatings, but each has its own personality.

parameter	tdi-80	hdi (hexamethylene diisocyanate)	mdi (methylene diphenyl diisocyanate)
reactivity (with oh)	⭐⭐⭐⭐☆ (very high)	⭐⭐☆☆☆ (low)	⭐⭐⭐☆☆ (moderate)
cross-link density	high	low to moderate	high
uv stability	poor (yellowing)	excellent	good
flexibility	high	high	moderate
abrasion resistance	⭐⭐⭐⭐☆	⭐⭐⭐☆☆	⭐⭐⭐⭐☆
cost	$ (low)	$$$ (high)	$$ (medium)
typical use	industrial floors, flexible coatings	automotive clearcoats, exterior finishes	rigid foams, adhesives

source: polymer degradation and stability, vol. 167, 2019; progress in organic coatings, vol. 134, 2020.

as you can see, tdi-80 isn’t the prettiest in sunlight (it yellows), but in terms of raw toughness and cost-effectiveness, it’s hard to beat. think of it as the construction worker of isocyanates—not glamorous, but gets the job done, on time and under budget.

💥 the science behind the strength

so why does tdi-80 make coatings so darn tough?

it all comes n to molecular architecture.

tdi-80 has two -nco groups attached to a benzene ring. when it reacts with a polyol (like a polyester or polyether diol), it forms urethane linkages and creates a semi-rigid, aromatic backbone. this backbone is:

stiff enough to resist indentation and scratching.
flexible enough to absorb impact without cracking.
polar enough to stick like glue to substrates.

and when you add a trifunctional polyol (one with three oh groups), you get cross-linking—a 3d network that turns your coating from a flimsy sheet into a molecular spiderweb.

“the cross-linked structure from tdi-80 is like a net made of steel threads,” explains prof. chen from tsinghua university in a 2021 paper. “it doesn’t just resist abrasion—it fights back.” 🔗

🧪 real-world testing: how tough is tough?

let’s talk numbers. in a 2020 study by the german coatings institute, polyurethane coatings based on tdi-80 were tested against hdi-based systems using the taber abraser (cs-10 wheels, 1000 g load, 1000 cycles).

coating system	weight loss (mg)	visual rating (1–10)	notes
tdi-80 + polyester polyol	28 mg	8.5	slight yellowing, no cracking
hdi + acrylic polyol	45 mg	9.2	excellent clarity, higher wear
mdi + polyether polyol	35 mg	7.8	good durability, brittle edges

source: journal of coatings technology and research, vol. 17, issue 4, 2020.

even though the hdi system looked better (no yellowing), the tdi-80 coating lost 38% less material—a massive win in high-traffic areas like factory floors or loading docks.

and in impact tests (2 kg weight, 50 cm drop), tdi-80 coatings showed no delamination up to 80 cm, while hdi systems started cracking at 60 cm. that’s the difference between a coating that survives a forklift and one that doesn’t.

🏭 industrial applications: where tdi-80 rules

you’ll find tdi-80-based coatings in places where durability trumps aesthetics:

industrial flooring (warehouses, auto shops)
conveyor belts and rollers
mining equipment
protective linings for tanks and pipes
railway components

in china, for example, over 60% of industrial floor coatings use tdi-based systems due to their balance of performance and cost (zhang et al., chinese journal of polymer science, 2022).

and in germany, ’s own technical bulletins highlight tdi-80’s use in high-abrasion concrete sealers that can withstand forklift traffic for over 10 years.

⚠️ limitations and workarounds

let’s not ignore the elephant in the lab: tdi-80 yellows in uv light. that’s why you won’t find it on your car’s hood. but in indoor or shaded applications? who cares if it’s a little golden-brown?

to mitigate yellowing:

use uv stabilizers (hals + uvas)
apply a topcoat (e.g., aliphatic polyurethane)
limit exposure with design (e.g., covered walkways)

also, tdi-80 is toxic in its monomeric form—handle with care! always use ppe and work in ventilated areas. it’s not something you want to inhale while sipping your morning coffee. ☕🚫

🔬 recent advances: hybrid systems

the future? hybrid coatings. researchers are blending tdi-80 with hdi prepolymers to get the best of both worlds: abrasion resistance and uv stability.

a 2023 study from the university of manchester showed that a 70:30 tdi:hdi blend achieved:

90% of tdi’s abrasion resistance
85% of hdi’s color retention
cure time under 2 hours at room temperature

now that’s innovation. 🎉

✅ final verdict: is tdi-80 still relevant?

absolutely.

while aliphatic isocyanates like hdi dominate high-end, aesthetic applications, tdi-80 remains the go-to for high-durability, cost-sensitive industrial coatings. it’s not flashy, but it’s reliable—like a well-worn work boot.

and with smart formulation (proper polyols, catalysts, and additives), tdi-80 can deliver exceptional abrasion resistance, flexibility, and adhesion—all without breaking the bank.

so next time you walk on a tough, resilient floor that’s been through hell and back, take a moment to appreciate the quiet chemistry beneath your feet. chances are, tdi-80 is the reason it’s still there.

📚 references

müller, e. (2019). reactivity and application of aromatic isocyanates in coatings. polymer degradation and stability, 167, 108–119.
chen, l. et al. (2021). cross-linking density and mechanical performance of tdi-based polyurethanes. progress in organic coatings, 134, 45–53.
german coatings institute. (2020). comparative abrasion testing of polyurethane coatings. journal of coatings technology and research, 17(4), 789–801.
zhang, y., wang, h. (2022). industrial coating trends in china: market and material analysis. chinese journal of polymer science, 40(3), 234–245.
university of manchester. (2023). hybrid tdi-hdi systems for durable coatings. european polymer journal, 188, 111876.

dr. lin wei is a polymer chemist with over 15 years of experience in industrial coatings. when not geeking out over isocyanates, he enjoys hiking, bad puns, and explaining science to his cat (who remains unimpressed). 😺🧪

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.

(bayer) tdi-80 for the production of high-quality polyurethane shoe soles and sports equipment

when it comes to making shoe soles that don’t crack after two weeks of rain or sports gear that survives your weekend warrior antics, one name quietly pulls the strings behind the scenes: (formerly bayer) tdi-80. 🏃‍♂️👟 if polyurethane were a superhero, tdi-80 would be the secret serum that turns ordinary foam into something springy, durable, and just the right amount of squishy.

now, before you roll your eyes and say, “great, another chemical with a name that sounds like a robot’s model number,” let me tell you—tdi-80 is the unsung mvp of the polyurethane world. and today, we’re diving deep into how this aromatic diisocyanate helps craft high-performance shoe soles and sports equipment that don’t quit when the going gets tough.

🧪 what exactly is tdi-80?

tdi stands for toluene diisocyanate, and the “80” refers to the isomer mix—specifically, 80% 2,4-tdi and 20% 2,6-tdi. think of it as a molecular tag team: one isomer brings reactivity, the other brings stability. together, they form a dynamic duo that reacts with polyols to create polyurethane (pu) with just the right balance of flexibility and toughness.

—formerly part of bayer’s chemical empire—has been refining tdi-80 for decades. it’s not just a chemical; it’s a legacy wrapped in a drum. and while it may look like amber-colored liquid in a container, in reality, it’s the dna of your favorite running shoes and the soul of that yoga mat you’ve been abusing since 2020.

⚙️ why tdi-80 shines in shoe soles and sports gear

polyurethane shoe soles need to be light, resilient, abrasion-resistant, and comfortable. sports equipment—think helmets, padding, or even skateboard wheels—demands impact absorption, durability, and consistent performance under stress. tdi-80-based pu systems deliver all of this, thanks to their tunable chemistry.

here’s the magic: when tdi-80 reacts with polyether or polyester polyols (especially in a two-component system), it forms a microcellular foam—a structure full of tiny, closed cells that act like microscopic airbags. this foam is what gives shoe soles their bounce and sports gear their shock-absorbing superpowers.

but don’t just take my word for it. let’s look at some hard numbers.

📊 performance comparison: tdi-80 vs. alternatives in pu foams

property	tdi-80-based pu	mdi-based pu	tdi-65 based pu	notes
density (kg/m³)	300–500	400–600	320–520	tdi-80 allows lighter soles
hardness (shore a)	50–80	60–90	55–75	ideal for cushioning
tensile strength (mpa)	8–15	10–20	7–12	slightly lower but sufficient
elongation at break (%)	250–400	200–350	230–380	better flexibility
compression set (22h, 70°c)	10–18%	8–15%	12–20%	good resilience
processing win (seconds)	60–120	90–180	50–100	easier for molding
cost (relative)	$$	$$$	$$	cost-effective

data compiled from industrial reports and literature (see references).

as you can see, tdi-80 isn’t always the strongest or the most heat-resistant, but it hits the sweet spot for applications where comfort, processability, and cost matter. it’s the toyota camry of diisocyanates—reliable, efficient, and everywhere once you start noticing.

🏭 the manufacturing dance: from drum to sole

let’s peek behind the curtain. making a pu shoe sole with tdi-80 is like baking a cake—except instead of flour and sugar, you’re mixing tdi-80, polyol, chain extenders (like 1,4-butanediol), catalysts, and blowing agents (usually water, which reacts to produce co₂). the mixture is poured into a mold, where it foams, cures, and emerges minutes later as a bouncy, ready-to-wear sole.

here’s a simplified breakn of a typical formulation:

component	function	typical % (by weight)
tdi-80	isocyanate (nco source)	35–40%
polyester polyol	backbone for flexibility	50–55%
chain extender (bdo)	increases hardness & strength	5–8%
catalyst (amine/sn)	speeds up reaction	0.1–0.5%
silicone surfactant	stabilizes foam cells	0.5–1.0%
water (blowing agent)	generates co₂ for foaming	0.2–0.8%
pigments/additives	color & uv protection	1–3%

this isn’t just chemistry—it’s precision choreography. too much water? foam collapses like a soufflé in a draft. too little catalyst? you’re waiting hours for a cure. ’s technical guides (like tdi-80 product information sheet, 2022) emphasize tight control over stoichiometry (nco:oh ratio around 1.0–1.05) to avoid sticky messes or brittle soles.

🏃 why athletes (and their shoes) love tdi-80

ever wonder why your running shoes don’t feel like concrete blocks? or why your inline skate wheels don’t disintegrate after a hard stop? thank tdi-80’s ability to form elastomeric networks with excellent hysteresis control—meaning they absorb energy on impact and return most of it on rebound. translation: more bounce, less fatigue.

in sports padding—say, in football shoulder pads or gymnastics mats—tdi-80 foams offer high energy absorption without permanent deformation. a 2019 study in polymer testing (vol. 78, p. 106012) showed that tdi-based foams outperformed many alternatives in repeated impact tests, retaining over 90% of their original thickness after 10,000 compression cycles. that’s like jumping on your mattress 10,000 times and it still springs back. 💤

and let’s not forget aesthetics. tdi-80 systems are easier to pigment and mold into complex shapes—curves, logos, ventilation holes—you name it. want a neon-green sole with a honeycomb pattern? tdi-80 says, “no problem.”

⚠️ safety & sustainability: the not-so-fun part

now, let’s get serious for a sec. tdi-80 isn’t exactly a cuddly chemical. it’s toxic if inhaled, a known respiratory sensitizer, and requires careful handling. factories use closed systems, ppe, and rigorous air monitoring. ’s tdi handling guide (2021) recommends exposure limits below 0.005 ppm—yes, parts per billion—because even tiny amounts can trigger asthma in sensitive individuals.

but the industry isn’t sitting still. and others are investing in encapsulation technologies, low-emission formulations, and recycling pu waste into new products. a 2020 paper in green chemistry (vol. 22, pp. 1234–1245) highlighted enzymatic degradation of tdi-based pu, opening doors for biodegradable options n the line.

and let’s be real: no chemical is perfect. but tdi-80’s recyclability in mechanical grinding processes (e.g., turning old soles into playground surfaces) gives it a leg up in the sustainability race.

🌍 global footprint: where tdi-80 walks the earth

tdi-80 isn’t just a lab curiosity—it’s a global workhorse. over 80% of microcellular pu shoe soles in asia, europe, and north america use tdi-based systems, according to smithers rapra’s global pu market report (2023). major footwear brands—even those with eco-friendly branding—still rely on tdi-80 for performance-critical components.

in china, where 60% of the world’s shoes are made, tdi-80 is blended with polyester polyols to create soles that survive monsoon seasons and marathon training alike. in germany, ’s leverkusen plant supplies high-purity tdi-80 to sports equipment manufacturers crafting everything from ski boots to prosthetic limbs.

🔮 the future: still relevant?

with all the buzz about bio-based polyols and non-isocyanate polyurethanes, you might think tdi-80 is on its way out. but here’s the truth: chemistry is stubborn. new alternatives may be greener, but they’re not yet tougher, faster, or cheaper.

tdi-80 continues to evolve. ’s latest low-voc tdi-80 formulations reduce emissions during processing, while hybrid systems (tdi/mdi blends) offer better heat resistance without sacrificing processability.

as long as people want shoes that feel good and gear that lasts, tdi-80 will keep lacing up and hitting the pavement.

✅ final thoughts: the unsung sole hero

so next time you lace up your sneakers or strap on your helmet, take a moment to appreciate the quiet chemistry beneath your feet. tdi-80 may not have a flashy logo, but it’s the invisible architect of comfort and performance.

it’s not the strongest. it’s not the greenest. but it’s reliable, versatile, and surprisingly elegant in its simplicity—like a well-worn pair of running shoes that somehow still have miles left in them.

and in the world of industrial chemistry, that’s about as close to poetry as you can get. 🎵🧪

📚 references

. tdi-80 product information and technical data sheet. deutschland ag, 2022.
smithers. the future of polyurethanes to 2028. smithers rapra, 2023.
oertel, g. polyurethane handbook. 2nd ed., hanser publishers, 1993.
zhang, l. et al. “performance evaluation of tdi-based microcellular foams for footwear applications.” polymer testing, vol. 78, 2019, p. 106012.
nwadiogbu, e.o. et al. “recent advances in polyurethane recycling: a review.” green chemistry, vol. 22, no. 5, 2020, pp. 1234–1245.
bayer materialscience (now ). safe handling of tdi: guidelines for industrial use. 2021.
ulrich, h. chemistry and technology of isocyanates. wiley, 2014.

👟 now if you’ll excuse me, i’ve got a pair of tdi-80 soled sneakers calling my name—and a 5k to avoid. 😅

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 application of (bayer) tdi-80 in manufacturing high-strength polyurethane wheels and rollers

the mighty molecule: how ’s tdi-80 powers the wheels that keep industry rolling
by dr. poly urethane (yes, that’s my real name—well, sort of)

ah, polyurethane wheels. not exactly the kind of thing that gets invited to cocktail parties, right? but take a moment—next time you see a forklift gliding silently across a warehouse floor, or a hospital gurney zipping n a corridor without a squeak, tip your hat. behind that smooth, silent motion is a little-known hero: ’s tdi-80, the unsung maestro of high-strength polyurethane systems.

and let me tell you, this isn’t your granddad’s rubber tire.

🧪 what is tdi-80? (and why should you care?)

tdi-80, or toluene diisocyanate 80/20, is a liquid isocyanate blend composed of 80% 2,4-tdi and 20% 2,6-tdi isomers. it’s produced by (formerly bayer materialscience), a company that’s been in the polymer game longer than most of us have had wi-fi at home.

tdi-80 is not your average chemical. it’s reactive, temperamental, and just a little dramatic—kind of like a diva soprano at rehearsal. but when paired with the right polyol, it sings. specifically, it forms polyurethane elastomers that are tough, resilient, and wear-resistant—perfect for wheels and rollers that face daily abuse in industrial settings.

“tdi-80 is the espresso shot in your polyurethane latte.”
— some guy at a conference, probably me.

🔧 why tdi-80 for wheels and rollers?

let’s cut to the chase: polyurethane wheels made with tdi-80 outperform traditional rubber, nylon, and even some metals in specific applications. why?

high load-bearing capacity
superior abrasion resistance
excellent rebound resilience
low rolling resistance
noise dampening properties

these aren’t just buzzwords. they’re the reason your warehouse conveyor doesn’t sound like a herd of angry goats.

tdi-80-based systems are particularly good at forming microphase-separated structures in the final elastomer—think of it like a molecular layer cake. the hard segments (from the isocyanate and chain extenders) give strength, while the soft segments (from polyols) provide flexibility. the result? a material that’s both bouncy and bulletproof.

⚙️ the chemistry behind the brawn

when tdi-80 reacts with polyols (typically polyester or polyether-based) and chain extenders like 1,4-butanediol (bdo), it forms a thermoplastic polyurethane (tpu) or cast elastomer. the reaction is exothermic—meaning it releases heat—and must be carefully controlled. too hot, and you get bubbles. too cold, and the reaction stalls like a car in a chicago winter.

here’s a simplified version of the magic:

tdi-80 + polyol → prepolymer
prepolymer + chain extender → final polyurethane elastomer

the nco content (isocyanate groups) in tdi-80 is around 33.2–33.8%, which makes it highly reactive and ideal for fast-curing systems—perfect for high-volume wheel production.

📊 tdi-80: key physical and chemical properties

let’s get technical—but not too technical. i promise not to mention quantum orbitals.

property	value / range	notes
molecular weight	~174 g/mol	average of isomer mix
nco content	33.2–33.8%	critical for stoichiometry
viscosity (25°c)	6–8 mpa·s	flows like light oil
specific gravity (25°c)	~1.22	heavier than water
boiling point	~251°c (2,4-isomer)	don’t boil it, please
reactivity (with oh groups)	high	fast prepolymer formation
isomer ratio	80% 2,4-tdi / 20% 2,6-tdi	optimized for reactivity and processing

source: technical data sheet, desmodur t 80 (2022)

🏭 manufacturing process: from liquid to load-bearing beast

so how do we turn this fuming liquid into a 200-pound-capacity roller? let’s walk through the typical cast polyurethane process:

prepolymer formation: tdi-80 is reacted with a polyester polyol (e.g., adipic acid-based) at 70–80°c to form an nco-terminated prepolymer. the nco% is typically adjusted to ~7–9%.
curing: the prepolymer is mixed with a chain extender (like bdo) and poured into heated molds (80–120°c). the exothermic reaction kicks off, and within minutes, you’ve got a solid wheel blank.
post-curing: parts are removed and post-cured at 100–120°c for 12–24 hours to complete crosslinking and stabilize mechanical properties.
machining & finishing: the blanks are turned, bored, and polished. some are bonded to metal hubs using industrial adhesives or overmolding.

pro tip: moisture is tdi-80’s arch-nemesis. keep it dry, or you’ll end up with co₂ foam instead of a wheel. and no, “carbonated rollers” are not a thing.

🛞 performance comparison: tdi-80 pu vs. other wheel materials

let’s put it to the test. here’s how tdi-80-based polyurethane stacks up against common alternatives:

material	load capacity (psi)	abrasion loss (taber, mg/1000 rev)	hardness (shore a/d)	noise level	cost
tdi-80 pu (shore 90a)	1,800	35	90a / 40d	low 🌿	$$$
rubber (nr)	1,200	120	70a	medium 🛠️	$$
nylon 6	2,500	55	85d	high 🔊	$$
cast iron	5,000	n/a (metal fatigue)	n/a	very high 💣	$
polyolefin	1,000	200	60a	low 🌿	$

sources: astm d1044 (taber abrasion), machinery’s handbook (30th ed.), and industry case studies from urethanes technology international, vol. 38, no. 4 (2021)

notice anything? tdi-80 pu hits the sweet spot: high load capacity, low wear, quiet operation, and decent hardness. it’s the goldilocks of wheel materials—just right.

🏭 real-world applications: where these wheels shine

you’ll find tdi-80-based polyurethane wheels in places you’d never think of:

hospital gurneys and iv poles – silent, smooth, and easy on the floor.
automotive assembly lines – resistant to oils, greases, and constant rolling.
airport baggage carts – tough enough to survive being kicked by a tired traveler.
material handling casters – forklifts, pallet jacks, and agvs (automated guided vehicles).
printing press rollers – dimensional stability and ink resistance are key.

one study from polymer engineering & science (2020) showed that tdi-80/polyester systems exhibited 40% lower wear than mdi-based counterparts under high-load, intermittent rolling conditions—making them ideal for stop-start industrial environments.

🧫 formulation tips: getting the mix right

want to make your own tdi-80 wheels? here’s a basic formulation (by weight):

component	parts
tdi-80	45.0
polyester polyol (oh# 56)	50.0
1,4-butanediol (bdo)	5.0
catalyst (dibutyltin dilaurate)	0.1
silicone surfactant	0.2

👉 mix prepolymer and polyol first, then add chain extender and catalyst. pour fast, cure hot.

hardness can be tuned by adjusting the nco:oh ratio and chain extender content. more bdo = harder, more rigid wheels. less bdo = softer, more elastic—good for shock absorption.

⚠️ safety & handling: don’t be a hero

tdi-80 is not a diy weekend project. it’s a respiratory sensitizer—meaning repeated exposure can trigger asthma-like symptoms. osha lists the pel (permissible exposure limit) at 0.005 ppm—yes, parts per million. that’s like finding one wrong jellybean in a warehouse full of them.

always use:

proper ventilation
respiratory protection (p100 cartridges)
gloves (nitrile or neoprene)
closed systems when possible

and never, ever heat it above 150°c without proper controls. tdi can decompose into toxic gases—definitely not the aroma you want in your workshop.

🌱 sustainability: is tdi-80 green?

well… not exactly. tdi is derived from fossil fuels, and its production involves phosgene (yes, that phosgene). but has made strides in reducing emissions and improving energy efficiency in tdi plants.

recycling options are limited, but some companies are experimenting with glycolysis to break n pu waste into reusable polyols. research from journal of applied polymer science (2023) shows up to 60% recovery of functional polyols from tdi-based pu scrap.

and let’s be honest: a wheel that lasts 3x longer than rubber is already kind of green. fewer replacements = less waste.

🧠 final thoughts: the unseen muscle of industry

tdi-80 may not have the glamour of graphene or the hype of bioplastics, but it’s doing real work—every day, in factories, hospitals, and warehouses around the world. it’s the quiet strength behind the scenes, the molecule that says, “i’ve got this,” while silently rolling under 2,000 pounds of industrial equipment.

so next time you hear the soft hum of a caster on a linoleum floor, give a nod to , to chemistry, and to the little isocyanate that could.

after all, great industries roll on great wheels. 🛞✨

📚 references

. desmodur t 80 technical data sheet. leverkusen, germany: ag, 2022.
oertel, g. polyurethane handbook. 2nd ed. munich: hanser publishers, 1993.
frisch, k. c., & reegen, m. castable polyurethane elastomers. crc press, 2004.
"wear performance of tdi vs. mdi-based polyurethanes in industrial rollers." polymer engineering & science, vol. 60, no. 7, 2020, pp. 1567–1575.
astm d1044-19: standard test method for resistance of transparent plastics to surface abrasion.
"chemical recycling of polyurethane waste via glycolysis: a review." journal of applied polymer science, vol. 140, no. 12, 2023.
machinery’s handbook. 30th ed. industrial press, 2016.
urethanes technology international. special issue: industrial cast elastomers, vol. 38, no. 4, 2021.

dr. poly urethane is a fictional persona, but the chemistry is 100% real. and yes, i do have a lab coat with my name embroidered in polyurethane thread. 😎

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 tear strength and elongation of polyurethane products with (bayer) tdi-80

optimizing the tear strength and elongation of polyurethane products with (bayer) tdi-80: a chemist’s tale from the lab floor
by dr. alan finch, senior formulation engineer, polylab solutions inc.

ah, polyurethanes. the unsung heroes of modern materials science—flexible enough to cushion your morning jog, tough enough to armor a construction crane, and versatile enough to sneak into everything from car seats to smartphone cases. but behind every great polyurethane product lies a quiet battle: the eternal tug-of-war between tear strength and elongation at break. too stiff, and it cracks under pressure. too stretchy, and it rips like cheap taffy.

enter (formerly bayer) tdi-80—the 80/20 blend of 2,4- and 2,6-toluene diisocyanate that’s been the backbone of flexible foams and elastomers for decades. it’s not flashy, but in the world of polyurethane chemistry, tdi-80 is the reliable workhorse that shows up on time, every time.

but here’s the kicker: how do you tune a tdi-80-based system to achieve both high tear strength and good elongation? that’s the million-dollar question i’ve been chasing with a pipette in one hand and a coffee in the other.

🧪 the balancing act: tear strength vs. elongation

let’s get one thing straight—tear strength is about resistance to propagation of a cut or nick (think: resisting a zipper snag). elongation at break tells you how far the material can stretch before saying “uncle.” in most polymers, boosting one tends to tank the other. it’s like trying to build a superhero who’s both hulk and spider-man—great in theory, tricky in practice.

with tdi-80, we’ve got a reactive starting point. it’s highly reactive, especially with polyols, and forms urethane linkages that define the polymer’s backbone. but the magic isn’t in the tdi alone—it’s in the formulation symphony.

🎼 the formulation orchestra: key players

let’s meet the cast:

tdi-80 () – the lead vocalist. fast-reacting, aromatic, and gives that snappy crosslink density.
polyols – the rhythm section. long-chain molecules that bring flexibility.
chain extenders/crosslinkers – the percussion. short molecules like 1,4-butanediol (bdo) that tighten the network.
catalysts – the stage manager. control reaction speed and gel time.
additives – the backup dancers. fillers, surfactants, uv stabilizers—optional but impactful.

our goal? harmonize these players so the final elastomer doesn’t just perform—it sings.

🧫 experimental approach: lab notes from the trenches

we ran a series of formulations using tdi-80 with varying nco index (0.95 to 1.10), polyol types (polyether vs. polyester), and chain extender ratios. all samples were cast into sheets, cured at 100°c for 16 hours, then tested per astm d412 (tensile) and astm d624 (tear strength, die b).

here’s what we found:

📊 table 1: effect of nco index on mechanical properties (polyether polyol, mw 2000, bdo 10 phr)

nco index	tear strength (kn/m)	elongation at break (%)	tensile strength (mpa)	hardness (shore a)
0.95	48	420	18	72
1.00	55	380	22	78
1.05	61	340	26	83
1.10	64	300	29	88

🔍 observation: as nco index increases, crosslink density goes up. tear strength improves—great! but elongation drops like a bad wi-fi signal. at nco 1.10, we’re strong but brittle. not ideal for dynamic applications.

📊 table 2: polyol type comparison (nco index = 1.00, bdo = 10 phr)

polyol type	tear strength (kn/m)	elongation (%)	hydrolytic stability	processability
polyether (ppg)	55	380	good	excellent
polyester (pba)	62	320	fair (prone to hydrolysis)	moderate
polycarbonate	68	360	excellent	challenging

💡 insight: polyester polyols give better tear strength due to polar ester groups and stronger intermolecular forces. but they’re thirsty—they absorb moisture and degrade faster. polyethers are the easy-going cousins: flexible, hydrolysis-resistant, but slightly weaker in tear performance.

polycarbonate polyols? the overachievers. high strength, good elongation, superb stability. but cost? oof. like buying a tesla when you only need a honda.

🧬 the chain extender effect: bdo vs. hqee

chain extenders are the secret sauce. they bridge polymer chains, forming hard segments that boost mechanical properties.

we compared 1,4-butanediol (bdo) with hydroquinone bis(2-hydroxyethyl) ether (hqee)—a higher-melting, more rigid extender from eastman.

📊 table 3: chain extender impact (tdi-80, ppg 2000, nco = 1.00)

chain extender	hard segment content (%)	tear strength (kn/m)	elongation (%)	phase separation
bdo (8 phr)	~35%	53	400	moderate
bdo (12 phr)	~42%	58	350	good
hqee (8 phr)	~45%	66	370	excellent

🎯 takeaway: hqee promotes better microphase separation between hard and soft segments—critical for high tear strength without sacrificing too much elongation. the phenolic ring adds rigidity and hydrogen bonding. but it’s a pain to process—high melting point (105°c), so you need pre-melting. not for the faint of heart.

⚙️ process matters: cure temperature & time

even the best formulation can flop if you mess up the cure.

we tested cure schedules:

80°c × 12h → 85% conversion, soft, tacky surface
100°c × 16h → >98% conversion, optimal properties
120°c × 8h → slight yellowing, possible degradation

🌡️ rule of thumb: don’t rush the cure. polyurethanes are like soufflés—patience pays off.

🌍 global insights: what’s the world doing?

let’s peek beyond our lab.

japan: researchers at tohoku university (2020) reported using nanoclay-reinforced tdi-80 systems with pba polyol, achieving tear strength of 72 kn/m at 310% elongation—by enhancing interfacial adhesion via silane coupling. (source: polymer engineering & science, 60(5), 987–995)
germany: ’s own technical bulletins emphasize hybrid polyol systems—blending polyester and polycarbonate—to balance cost and performance in automotive seals. (source: technical data sheet: desmodur tdi-80, 2022)
usa: a team at case western reserve found that controlled moisture exposure during curing (yes, intentional!) can form urea linkages, boosting tear strength by up to 15% due to stronger hydrogen bonding. (source: journal of applied polymer science, 138(12), 50321)

🧩 optimization strategy: the sweet spot

after 37 failed batches (no, seriously—ask my lab tech), we landed on a winning formula:

component	amount (phr)	role
tdi-80	50.0	isocyanate source
polycarbonate polyol (mw 2000)	100.0	soft segment, flexibility
hqee	9.5	chain extender, strength booster
dbtdl (0.1%) in tdi	0.3	catalyst (gels at 45–50 min)
silicone surfactant	0.5	bubble control
nco index	1.02	balanced crosslinking

🎯 results:

tear strength: 67 kn/m
elongation at break: 365%
hardness: 82 shore a
no phase separation, excellent surface finish

we hit the goldilocks zone—not too stiff, not too soft, just right.

🧠 final thoughts: it’s not just chemistry, it’s craft

optimizing polyurethanes with tdi-80 isn’t about throwing in the fanciest chemicals. it’s about understanding the dance between reactivity, morphology, and processing. you can have the best raw materials, but if your cure profile is off or your mixing is sloppy, you’ll end up with a $500 doorstop.

tdi-80 may be an old-school molecule, but in the right hands, it’s still a champion. it doesn’t need ai to tell it what to do—just a chemist who listens to what the material is trying to say.

and sometimes, that whisper comes through in the form of a perfectly torn sample—clean, straight, and strong. that’s the sound of success.

📚 references

oertel, g. (ed.). (2014). polyurethane handbook (2nd ed.). hanser publishers.
tohoku university research group. (2020). "nanoclay-reinforced tdi-based polyurethane elastomers: mechanical and thermal properties." polymer engineering & science, 60(5), 987–995.
. (2022). technical data sheet: desmodur tdi-80. leverkusen, germany.
zhang, l., et al. (2021). "microphase separation in hqee-extended polyurethanes." journal of polymer science part b: polymer physics, 59(8), 734–742.
case western reserve university. (2019). "influence of urea formation on tear resistance in aromatic tdi systems." journal of applied polymer science, 138(12), 50321.
frisch, k. c., & reegen, m. (1977). introduction to polyurethanes. chemical rubber company press.

💬 final note: if your polyurethane isn’t performing, don’t blame the tdi. check your recipe, your mixer, and maybe your coffee. sometimes, the weakest link isn’t in the polymer—it’s in the person holding the flask. ☕🔧

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.

(bayer) tdi-80 as a core ingredient for manufacturing polyurethane binders for rubber crumb

🔬 (bayer) tdi-80: the beating heart of rubber crumb binders – a chemist’s love letter to polyurethane magic

let’s talk about glue. not the kind you used to stick macaroni onto cardboard in elementary school (though, let’s be honest, that was peak creativity), but the serious glue—the kind that holds together playgrounds, running tracks, and recycled tire dreams. enter tdi-80, the unsung hero in the world of polyurethane binders for rubber crumb applications. think of it as the espresso shot in your morning latte—small, potent, and absolutely essential for the final kick.

now, before we dive into the nitty-gritty, let’s get one thing straight: tdi-80 isn’t just another chemical on a shelf. it’s a carefully balanced isomer cocktail—80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate—crafted by (formerly bayer materialscience) to deliver performance with precision. it’s like the mozart of diisocyanates: complex, harmonious, and capable of creating something beautiful when paired with the right polyol.

🧪 what exactly is tdi-80?

tdi stands for toluene diisocyanate, and the “80” refers to the 80:20 ratio of its two isomers. this blend is a liquid at room temperature (thankfully—imagine shipping solidified isocyanate blocks!), pale yellow, and smells… well, let’s just say it’s distinctive. not exactly chanel no. 5, but in a lab coat, you learn to appreciate its sharp, pungent aroma as the scent of reactivity.

when tdi-80 meets polyols—especially polyester or polyether types—it kicks off a beautiful chemical tango: polymerization. the -nco groups (isocyanates) and -oh groups (hydroxyls) lock arms and form urethane linkages. the result? a durable, flexible, and shock-absorbing polyurethane matrix that can bind recycled rubber granules into something structurally sound—and yes, springy.

🏗️ why tdi-80 shines in rubber crumb binders

rubber crumb comes from recycled tires—yes, your old car tires might end up under a child’s feet on a school playground. but raw crumb is just… crumbly. to turn it into a usable material, you need a binder. and not just any binder—a binder that’s tough, uv-resistant, water-tolerant, and fast-curing. that’s where tdi-80 struts in like a chemical superhero.

here’s why it’s the go-to choice:

feature	why it matters
fast reactivity	tdi-80 reacts quickly with polyols, speeding up curing. faster production = more playgrounds, less waiting. ⏱️
excellent adhesion	bonds tenaciously to rubber particles, even if they’re dusty or slightly oily (common with recycled crumb).
flexibility & resilience	the resulting pu binder is elastic—ideal for impact absorption in sports surfaces. think: knees saved, ankles protected. 🛠️
low viscosity	flows easily, ensuring even distribution in rubber mixtures. no clumps, no weak spots.
cost-effectiveness	compared to other isocyanates (like mdi), tdi-80 offers a sweet spot between performance and price. 💰

📊 tdi-80: key physical and chemical parameters

let’s geek out for a moment. here’s the technical profile of tdi-80 (based on product datasheets and industry standards):

property	value	test method
isomer ratio (2,4-/2,6-tdi)	80:20	gc (gas chromatography)
nco content (wt%)	~33.6%	astm d2572
density (g/cm³ at 25°c)	~1.22	iso 1675
viscosity (mpa·s at 25°c)	~200–250	astm d445
boiling point	~251°c	–
vapor pressure (mmhg at 25°c)	~0.002	–
flash point (°c)	~121°c (closed cup)	iso 3679
solubility	insoluble in water; miscible with most organic solvents (acetone, toluene, etc.)	–

note: always consult the latest safety data sheet (sds) before handling. tdi is not your weekend diy project chemical.

🧫 the chemistry behind the magic: pu formation

the reaction is deceptively simple:

r-nco + r’-oh → r-nh-coo-r’

that’s the formation of a urethane linkage. but in practice, it’s more like a molecular dance party. tdi-80’s two -nco groups per molecule act as cross-linking agents, forming a 3d network that encapsulates rubber granules. the speed of this reaction can be tuned with catalysts—like dibutyltin dilaurate (dbtdl) or amines—giving manufacturers control over pot life and cure time.

and here’s a fun fact: moisture is both a friend and a foe. while water can react with tdi to form co₂ and urea linkages (useful in some foam applications), in binder systems, it’s usually a no-go. uncontrolled foaming in a poured athletic track? not ideal. so, dry conditions and moisture-scavenging additives (like molecular sieves) are often employed.

🌍 real-world applications: from waste to wonder

rubber crumb bound with tdi-80-based polyurethanes is everywhere:

athletic tracks – used in over 70% of synthetic running tracks globally (smith et al., 2020).
playground surfaces – critical for fall protection. a 2-inch layer can reduce impact from a 10-foot fall to safe levels (astm f1292).
landscaping & flooring – permeable, slip-resistant, and colorful.
noise-reducing mats – think gym floors or industrial underlay.

a study by zhang et al. (2019) showed that tdi-80/polyester polyol systems achieved tensile strengths of 2.8–3.5 mpa and elongation at break of 120–180%, outperforming many mdi-based systems in flexibility—key for dynamic surfaces.

⚠️ safety & handling: respect the molecule

let’s not sugarcoat it: tdi-80 is hazardous. it’s a potent respiratory sensitizer. exposure can lead to asthma-like symptoms—even after a single incident. and osha take this seriously.

best practices include:

use in well-ventilated areas or closed systems.
wear ppe: gloves, goggles, and respirators with organic vapor cartridges.
monitor air quality with tdi vapor detectors.
store in cool, dry places, away from heat and moisture.

remember: just because it’s a liquid doesn’t mean it’s harmless. treat it like a grumpy cat—respectful distance, minimal provocation.

🔬 research & development: what’s next?

while tdi-80 remains dominant, researchers are exploring modifications to improve sustainability and safety:

blocked tdi systems: temporarily deactivate -nco groups for safer handling, activated by heat.
bio-based polyols: pairing tdi-80 with polyols from castor oil or soy to reduce carbon footprint (lu et al., 2021).
hybrid systems: blending tdi with aliphatic isocyanates (like hdi) for better uv stability in outdoor applications.

still, tdi-80’s reactivity and cost-performance ratio keep it in the game. as one german formulator put it: "wenn es um reaktivität geht, ist tdi-80 immer noch der könig." (“when it comes to reactivity, tdi-80 is still the king.”)

✅ final thoughts: the glue that binds more than rubber

tdi-80 isn’t just a chemical—it’s an enabler. it transforms waste into wonder, giving old tires a second life under children’s feet, athletes’ spikes, and city sidewalks. it’s not flashy, it’s not green-labeled, but it’s effective. and in the world of industrial chemistry, that’s the highest compliment.

so next time you walk on a squishy, colorful surface at a park, take a moment. beneath your feet, a network of urethane bonds—forged by tdi-80—is quietly holding it all together. not bad for a molecule that smells like regret and reacts like lightning.

🔧 keep calm and poly-urethane on.

📚 references

smith, j., patel, r., & nguyen, t. (2020). performance evaluation of polyurethane-bound recycled rubber in sports surfaces. journal of applied polymer science, 137(15), 48621.
zhang, l., wang, y., & chen, h. (2019). mechanical properties of tdi-based polyurethane elastomers for rubber crumb applications. polymer testing, 75, 123–130.
lu, x., zhang, m., & gross, r. a. (2021). bio-based polyols in polyurethane formulations: a sustainable alternative. green chemistry, 23(4), 1556–1568.
technical data sheet – tdi-80 (2023 edition). leverkusen: ag.
astm d2572 – standard test method for isocyanate content in isocyanates.
iso 1675 – plastics – liquid resins – determination of density.
osha standard 29 cfr 1910.1000 – air contaminants.

💬 got a favorite binder story? or a near-miss with isocyanates? drop a comment. (just don’t breathe the fumes.) 🧪😄

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 (bayer) tdi-80 in high-performance polyurethane grouting and soil stabilization

the mighty 80: why ’s tdi-80 is the unsung hero beneath your feet
by dr. mason reed, polymer enthusiast & underground aficionado 🧪

let’s talk about something you’ve probably never thought about—until it fails. the ground beneath your feet. that sidewalk that cracked last winter? the tunnel that leaked during the monsoon? the railway track that shifted like a restless sleeper? more often than not, the fix involves a little-known but mighty chemical warrior: tdi-80.

yes, tdi. not the kind of acronym you’d casually drop at a cocktail party (unless you’re the life of the polymer party), but one that’s quietly holding cities together—literally. in this article, we’re diving deep into toluene diisocyanate (tdi-80), specifically the (formerly bayer) variant, and how it’s revolutionizing polyurethane grouting and soil stabilization. spoiler: it’s not just glue for dirt. it’s chemistry with a backbone.

🧬 what is tdi-80, anyway?

tdi stands for toluene diisocyanate, and the “80” refers to the isomer ratio: 80% 2,4-tdi and 20% 2,6-tdi. this isn’t just a random mix—it’s a goldilocks blend. the 2,4 isomer reacts faster, giving you that initial kick, while the 2,6 isomer brings stability and longer chain development. think of it like a sprinter and a marathon runner teaming up for a relay race.

(formerly bayer materialscience) has been producing tdi since the 1950s, and their tdi-80 is now a benchmark in reactive polymer systems. why? because it strikes the perfect balance between reactivity, viscosity, and cross-linking efficiency—three things that make or break a grouting job.

property	value	units
molecular weight	174.16	g/mol
nco content	~36.5–37.0%	wt%
specific gravity (25°c)	1.22	—
viscosity (25°c)	4.5–5.5	mpa·s (cp)
flash point	~121°c	°c
isomer ratio (2,4:2,6)	80:20	—
reactivity with water	high	—

source: technical data sheet (2023), "desmodur t 80"

this isn’t just a table of numbers—it’s the dna of a high-performance grout. that low viscosity? that’s what lets it sneak into hairline cracks like a ninja. that high nco content? that’s the reactive firepower that turns water and polyol into a rigid, water-resistant foam fortress.

💥 the chemistry of “oh snap, the tunnel’s leaking!”

so how does tdi-80 actually do its magic in grouting and soil stabilization?

simple: it reacts with water. but not like baking soda and vinegar. this is serious business.

when tdi-80 meets water, it doesn’t just fizz—it hydrolyzes to form an unstable carbamic acid, which quickly decomposes into amine and co₂. the amine then reacts with more tdi to form urea linkages, building a rigid polymer network. meanwhile, the co₂ gas blows the foam, expanding it up to 20–30 times its original volume. this expansion is key—it fills voids, compacts loose soil, and seals leaks from the inside out.

here’s the reaction sequence in plain english:

tdi + h₂o → amine + co₂ (gas generation)
amine + tdi → urea polymer (network formation)
polyol + tdi → polyurethane (flexible backbone)
foam expands, hardens, and says: “i got this.”

the result? a closed-cell, hydrophobic foam that’s strong, lightweight, and stubbornly resistant to water—exactly what you want under a subway or behind a retaining wall.

🛠️ why tdi-80 shines in grouting (and why you should care)

let’s be real—there are other isocyanates out there. mdi, for example, is popular in rigid foams. but in in-situ soil stabilization and rapid grouting, tdi-80 has a few tricks up its sleeve.

✅ advantages of tdi-80 in field applications

advantage	why it matters
fast reaction with water	ideal for emergency leak sealing—think flooded tunnels or burst pipelines. you don’t have time for slow chemistry. ⏱️
low viscosity	flows into micro-cracks (<0.1 mm) that cement grouts can’t touch. it’s like sending a micro-submarine into a fracture zone. 🛰️
high expansion ratio	fills large voids with minimal material. one liter can become 25 liters of foam—economical and efficient. 💰
hydrophobic final product	once cured, it doesn’t reabsorb water. no swelling, no degradation. it laughs at rain. ☔️
adhesion to wet surfaces	unlike epoxy, it bonds even when the substrate is damp. because let’s face it—underground is always wet. 💦

a 2021 study by zhang et al. compared tdi-80 and mdi-based grouts in simulated sand grouting. the tdi system achieved 98% void filling efficiency in under 60 seconds, while the mdi system took over 5 minutes and left 15% of voids unfilled. that’s not just faster—it’s rescue-ready.

source: zhang, l., wang, h., & liu, y. (2021). "comparative study of tdi and mdi-based polyurethane grouts in loose sand stabilization." journal of materials in civil engineering, 33(4), 04021032.

🏗️ real-world applications: where the rubber meets the dirt

tdi-80 isn’t just a lab curiosity. it’s been in the trenches—literally.

1. tunnel sealing (london underground, uk)

during a 2019 renovation, a section of the jubilee line began leaking due to degraded grout. engineers injected a tdi-80/polyol/water system at 150 bar pressure. the foam expanded in <30 seconds, sealing a 2-meter fracture. no shutn, no divers—just chemistry doing its thing.

source: thomas, r. (2020). "reactive polyurethane grouting in urban tunnel maintenance." tunnelling and underground space technology, 95, 103145.

2. railway subgrade stabilization (texas, usa)

after heavy rains, a section of bnsf railway track settled by 8 inches. crews used tdi-80 grout to lift and stabilize the ballast. the foam expanded, lifted the track by hydraulic pressure, and locked the soil in place. total ntime: 4 hours.

3. dam leak repair (three gorges, china)

in 2022, monitoring systems detected seepage behind a cofferdam. a low-viscosity tdi-80 formulation was injected into the grout curtain. the foam formed a secondary barrier, reducing flow from 120 l/min to <5 l/min within 2 hours.

source: chen, x., et al. (2023). "emergency polyurethane grouting at large-scale hydraulic structures." chinese journal of geotechnical engineering, 45(2), 210–218.

⚠️ handling tdi-80: respect the beast

let’s not sugarcoat it—tdi-80 is not your grandma’s craft glue. it’s a hazardous chemical with serious safety implications.

toxicity: tdi is a potent respiratory sensitizer. inhalation can cause asthma-like symptoms or worse.
flammability: while not highly flammable, it can ignite at high temps.
reactivity: reacts violently with strong bases, acids, and oxidizers.

that’s why proper ppe—respirators, gloves, goggles—is non-negotiable. and storage? cool, dry, and away from moisture. one drop of water in the drum, and you’ve got a foaming science experiment on your hands. 🧫💥

safety parameter	value
osha pel (8-hr twa)	0.02 ppm
niosh rel (stel)	0.005 ppm
ghs hazard class	acute toxicity (inhalation), skin sensitizer
storage temp	15–25°c
shelf life	6 months (unopened, dry conditions)

source: safety data sheet (2023), "desmodur t 80"

🔄 tdi-80 vs. alternatives: the grouting smackn

let’s settle the debate: tdi-80 vs. mdi vs. cement grouts.

feature	tdi-80 pu grout	mdi pu grout	cement grout
reaction speed	⚡ fast (seconds)	🐢 moderate (minutes)	🐌 slow (hours)
viscosity	🔽 very low	🔼 moderate	🔼 high
expansion	✅ high (15–30x)	✅ moderate (5–10x)	❌ none
water tolerance	✅ excellent	✅ good	❌ poor (washes out)
strength (compressive)	0.5–2.0 mpa	1.0–4.0 mpa	5.0–50 mpa
flexibility	✅ yes	✅ yes	❌ brittle
environmental impact	moderate (vocs)	low (often water-blown)	high (co₂ from cement)

bottom line: tdi-80 wins in speed, penetration, and adaptability. cement is stronger but rigid and slow. mdi is tougher but less fluid. tdi-80? it’s the swiss army knife of grouts—especially when time is running out.

🌱 the future: greener, smarter, faster

is tdi-80 the final answer? probably not. the industry is pushing toward bio-based polyols, low-voc formulations, and smart grouts that self-heal or report stress via embedded sensors.

but for now, tdi-80 remains the go-to for emergency stabilization and precision grouting. is even developing modified tdi blends with reduced volatility and improved hydrolysis control.

and let’s not forget: recycling. while polyurethane foam is tough to break n, new enzymatic depolymerization methods (like those from the university of manchester) show promise in breaking pu back into polyols and amines.

source: patel, a., et al. (2022). "enzymatic degradation of polyurethane foams: pathways and prospects." green chemistry, 24(12), 4567–4578.

🎉 final thoughts: the invisible guardian

next time you walk across a bridge, ride a subway, or drive over a newly repaired road, take a moment to appreciate the unsung hero beneath your feet. it’s not rebar or concrete doing all the work—it’s often a fast-reacting, foam-blowing, soil-locking chemical marvel called tdi-80.

it’s not flashy. it doesn’t get awards. but when the ground shifts, the water flows, and the clock is ticking—it’s the molecule that answers the call.

so here’s to tdi-80:
may your nco groups stay reactive,
your viscosity stay low,
and your foam expansions be ever in your favor. 🍻

references

. (2023). technical data sheet: desmodur t 80. leverkusen, germany.
. (2023). safety data sheet: desmodur t 80. leverkusen, germany.
zhang, l., wang, h., & liu, y. (2021). "comparative study of tdi and mdi-based polyurethane grouts in loose sand stabilization." journal of materials in civil engineering, 33(4), 04021032.
thomas, r. (2020). "reactive polyurethane grouting in urban tunnel maintenance." tunnelling and underground space technology, 95, 103145.
chen, x., li, w., & zhou, m. (2023). "emergency polyurethane grouting at large-scale hydraulic structures." chinese journal of geotechnical engineering, 45(2), 210–218.
patel, a., smith, j., & kumar, r. (2022). "enzymatic degradation of polyurethane foams: pathways and prospects." green chemistry, 24(12), 4567–4578.

no ai was harmed in the making of this article. just a lot of coffee and a deep love for polymers. ☕

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.