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Low-viscosity liquid trimer based on toluene diisocyanate (TDI), enabling easy handling and metering in automated systems.
Excellent compatibility with polyester and polyether polyols, supporting broad formulation flexibility.
Provides fast cure kinetics at ambient or slightly elevated temperatures, improving production efficiency.
Delivers superior chemical resistance and mechanical strength in final polyurethane coatings and adhesives.
Free of solvents and volatile organic compounds (VOCs), supporting sustainable manufacturing and regulatory compliance.
Two-component polyurethane industrial maintenance coatings for metal and concrete substrates.
High-performance automotive refinish clearcoats and basecoat/clearcoat systems.
Flexible and rigid polyurethane adhesives for bonding composites, plastics, and elastomers.
UV-resistant protective topcoats for outdoor signage, architectural panels, and transportation components.
| Chemical Type | TDI-based isocyanurate trimer |
| Product Form | Liquid |
| Appearance | Pale yellow to amber, clear liquid |
| NCO Content (wt %) | 13.5 – 14.5 |
| Viscosity at 25 °C (mPa·s) | 800 – 1,200 |
| Density at 20 °C (g/cm³) | 1.18 – 1.22 |
| Storage Stability | At least 12 months in sealed containers at <25 °C |
| Primary Applications | 2K PU coatings, adhesives, sealants, and elastomers |
Q1: What is the primary function of Desmodur IL BA in coating and adhesive formulations?
A: Desmodur IL BA is a low-viscosity, aliphatic triisocyanate-based curing agent designed to react with hydroxyl-functional resins (e.g., polyesters, acrylics, or polyethers) to form durable, chemically resistant polyurethane networks. It enables ambient- or low-bake cure profiles while delivering excellent gloss retention and weather stability.
Q2: How does Desmodur IL BA differ from aromatic isocyanate curing agents like standard TDI or MDI trimers?
A: Unlike aromatic systems, Desmodur IL BA is based on aliphatic isocyanate chemistry, resulting in superior UV resistance and minimal yellowing over time. Its trimer structure provides enhanced steric hindrance and hydrolytic stability compared to monomeric isocyanates, making it suitable for high-performance exterior applications where long-term color and clarity are critical.
Q3: Is Desmodur IL BA compatible with moisture-cure or one-component polyurethane systems?
A: No — Desmodur IL BA is formulated for two-component (2K) polyurethane systems only. It requires intentional mixing with hydroxyl-containing components prior to application and is not intended for moisture-cured or blocked-isocyanate technologies. Its reactivity profile is optimized for controlled pot life and film formation under standard industrial conditions.
Q4: What are typical handling and storage recommendations for Desmodur IL BA?
A: Store in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 15–25 °C. Avoid exposure to moisture, heat above 40 °C, and direct sunlight. Prior to use, ensure substrates and equipment are clean and free of water, alcohols, or amines that could prematurely consume isocyanate groups.
Q5: Can Desmodur IL BA be used in low-VOC or high-solids formulations?
A: Yes — its low viscosity and high functionality allow efficient formulation at elevated solids content, supporting VOC reduction strategies. When combined with low-VOC hydroxyl resins and appropriate solvents, it contributes to compliant 2K systems without compromising crosslink density or mechanical performance.
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