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Aliphatic polyisocyanate-based curing agent offering excellent UV resistance and color stability.
Low-viscosity liquid formulation enabling easy handling, precise metering, and efficient mixing with hydroxyl-functional resins.
Provides rapid ambient-cure performance while maintaining extended pot life for industrial coating applications.
Compliant with major global VOC regulations, supporting sustainable coating system design.
Delivers superior hardness, chemical resistance, and gloss retention in final cured films.
Automotive clearcoats and refinish topcoats requiring high durability and optical clarity.
Industrial maintenance coatings for metal substrates exposed to outdoor weathering.
High-performance plastic coatings where flexibility and adhesion to ABS/PC are critical.
Wood finishing systems demanding fast throughput and low-temperature cure capability.
General-purpose two-component polyurethane (2K PU) protective coatings for architectural and transportation sectors.
| Chemical Type | Aliphatic polyisocyanate (hexamethylene diisocyanate trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| NCO Content (wt%) | Approx. 13.5–14.5% |
| Viscosity at 25°C (mPa·s) | 250–450 |
| Density at 25°C (g/cm³) | 1.18–1.22 |
| Flash Point (PMCC, °C) | 145–155 |
| Storage Stability | ≥12 months in original unopened container at 15–25°C |
Q1: What is the primary chemical nature of TOLONATE HDT-90?
A: TOLONATE HDT-90 is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), modified as a biuret-type trimer. It contains no free HDI monomer and offers excellent weather resistance, clarity, and compatibility with common hydroxyl-functional resins.
Q2: How should TOLONATE HDT-90 be stored to maintain stability and performance?
A: Store in tightly sealed containers under dry, cool conditions (ideally below 30 °C) and protect from moisture, heat, and direct sunlight. Prolonged exposure to humidity may cause gelation or viscosity increase due to reaction with ambient water vapor.
Q3: Which resin systems is TOLONATE HDT-90 typically compatible with?
A: It demonstrates broad compatibility with hydroxyl-functional acrylics, polyesters, and alkyds used in high-performance coatings. It is especially suited for two-component (2K) clearcoats, topcoats, and industrial finishes requiring excellent gloss retention and UV stability.
Q4: What is the typical NCO content range, and how does it influence formulation design?
A: TOLONATE HDT-90 has a nominal NCO content in the range of approximately 17–19 wt%, which supports predictable stoichiometric balancing with OH-functional components. This enables formulators to achieve optimal crosslink density while maintaining manageable pot life and film properties.
Q5: Can TOLONATE HDT-90 be used in low-VOC or high-solids coating systems?
A: Yes — its low volatility, absence of solvents, and high functionality make it well-suited for low-VOC, high-solids, and even solvent-free 2K systems where reduced emissions and improved film build are required.
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