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High reactivity with hydroxyl-functional resins, enabling rapid room-temperature or low-bake curing.
Excellent yellowing resistance and UV stability for long-term color retention in clear and light-colored coatings.
Low viscosity and good compatibility with common polyols and acrylic resins, facilitating easy formulation and processing.
Low monomer content and reduced volatility, contributing to improved workplace safety and lower VOC emissions.
Consistent batch-to-batch performance ensured by stringent quality control and proprietary purification technology.
Automotive OEM and refinish clearcoats requiring high gloss, hardness, and weatherability.
Industrial maintenance coatings for metal substrates exposed to harsh environmental conditions.
High-performance wood finishes used in premium furniture and interior architectural applications.
Plastic coatings for automotive interior parts and consumer electronics housings.
Two-component polyurethane systems for durable floor and concrete sealers.
| Chemical Type | Aliphatic isocyanurate-based HDI trimer |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt%) | 18.5–19.5% |
| Viscosity (mPa·s, 25°C) | 800–1200 |
| Density (g/cm³, 25°C) | 1.21–1.24 |
| Flash Point (°C, closed cup) | 135–145 |
| Storage Stability | ≥12 months at <25°C in sealed container |
Q1: What is the primary chemical composition and functional role of HT-75B?
A: HT-75B is a polyisocyanate-based curing agent derived from hexamethylene diisocyanate (HDI), formulated as a biuret-type adduct. It functions as a crosslinker for hydroxyl-containing resins—such as polyester, acrylic, or polyether polyols—in two-component polyurethane systems, delivering excellent gloss retention, weather resistance, and mechanical durability.
Q2: How does HT-75B compare to traditional HDI isocyanurate curing agents in terms of reactivity and pot life?
A: As a biuret-type HDI adduct, HT-75B exhibits moderate reactivity—lower than HDI isocyanurates but higher than many aromatic curing agents. This balance supports extended pot life under ambient conditions while maintaining efficient cure development at elevated temperatures, making it well-suited for industrial coating applications requiring both handling flexibility and performance reliability.
Q3: Is HT-75B compatible with moisture-cure or one-component PU systems?
A: No—HT-75B is specifically designed for two-component (2K) polyurethane systems where it is mixed separately with hydroxyl-functional resins immediately prior to application. It is not formulated for moisture-cure or blocked one-component systems, as its reactivity profile and stability are optimized for controlled 2K mixing and application.
Q4: What are key storage and handling recommendations for HT-75B?
A: Store in tightly sealed containers under dry, cool conditions (below 30°C) and protect from moisture, direct sunlight, and strong oxidizing agents. Avoid prolonged exposure to ambient humidity during handling, as isocyanates are moisture-sensitive. Use appropriate PPE—including nitrile gloves, safety goggles, and respiratory protection when aerosol or vapor generation is possible.
Q5: Can HT-75B be used in high-solids or low-VOC coating formulations?
A: Yes—HT-75B is commonly employed in high-solids and solvent-reduced polyurethane systems due to its relatively low viscosity and favorable compatibility with modern resin technologies. Its formulation enables formulators to achieve target solids content and VOC compliance without compromising film formation or final coating properties.
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