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Low-viscosity aliphatic isocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Excellent weathering and UV resistance due to aliphatic backbone — ideal for outdoor applications.
Compatible with a wide range of hydroxyl-functional resins including polyesters, acrylics, and polyethers.
Enables fast ambient or forced-dry curing with low VOC emissions and minimal yellowing over time.
Stabilized formulation offering extended pot life and consistent reactivity under standard handling conditions.
High-performance automotive clearcoats and basecoats requiring gloss retention and durability.
Industrial maintenance coatings for infrastructure, machinery, and agricultural equipment.
Architectural façade and metal cladding coatings exposed to harsh environmental conditions.
Plastic and composite coatings where substrate flexibility and adhesion stability are critical.
UV-stable powder coating topcoats when blended with compatible polyester resins.
| Chemical Type | Aliphatic HDI-based trimer isocyanate |
| Product Form | Liquid |
| Appearance | Clear, colorless to pale yellow liquid |
| NCO Content (wt%) | 15.5 – 16.5% |
| Viscosity at 25°C (mPa·s) | 800 – 1,200 |
| Density at 20°C (g/cm³) | 1.17 – 1.21 |
| Flash Point (PMCC, °C) | 145 – 155 |
| Primary Applications | Two-component polyurethane coatings for demanding industrial and automotive uses |
Q1: What is the primary chemical nature and functional role of Desmodur IL BA in coating and adhesive systems?
A: Desmodur IL BA is a low-viscosity, aliphatic isocyanate curing agent based on hexamethylene diisocyanate (HDI) trimer chemistry. It functions as a crosslinker for hydroxyl-functional resins—such as polyesters, acrylics, and polyethers—enabling ambient- or heat-cured, high-performance coatings with excellent weather resistance, gloss retention, and mechanical durability.
Q2: How does Desmodur IL BA compare to aromatic isocyanate curing agents in terms of performance and application suitability?
A: Unlike aromatic isocyanates (e.g., TDI or MDI derivatives), Desmodur IL BA is aliphatic, which provides superior UV stability and non-yellowing performance—making it ideal for exterior architectural coatings, automotive clearcoats, and light-colored industrial finishes where long-term color fidelity is critical.
Q3: What are typical handling and storage recommendations to maintain product integrity?
A: Desmodur IL BA should be stored in tightly sealed containers under dry, inert conditions (e.g., nitrogen blanket) at temperatures between 15–25 °C. Exposure to moisture must be strictly avoided, as isocyanates react readily with water—leading to CO₂ evolution, viscosity increase, and gelation over time. Use only with dry air or nitrogen during transfer and processing.
Q4: Can Desmodur IL BA be used in solvent-free or high-solids formulations?
A: Yes—its inherently low viscosity and high NCO content allow efficient formulation of high-solids and low-VOC coating systems. It is also compatible with reactive diluents and can support reduced-solvent or solvent-free two-component polyurethane adhesives and sealants when paired with appropriate polyols.
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