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Low viscosity for excellent processability and easy handling in coating and adhesive formulations.
Enhanced chemical resistance and weatherability due to the stable biuret structure of hexamethylene diisocyanate (HDI).
Good compatibility with common polyols and resins used in two-component polyurethane systems.
Reduced volatility compared to monomeric HDI, contributing to improved workplace safety and lower VOC emissions.
Consistent reactivity profile enabling reliable pot life control and predictable film formation.
High-performance automotive clearcoats and basecoats.
Industrial maintenance coatings for metal and concrete substrates.
Architectural facade coatings requiring UV stability and gloss retention.
Flexible and rigid polyurethane adhesives for composite bonding.
Electronics encapsulation and protective conformal coatings.
| Chemical Type | HDI-based biuret oligomer |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| NCO Content (wt%) | 18.5–19.5% |
| Viscosity (25°C, mPa·s) | 1,200–1,800 |
| Density (20°C, g/cm³) | 1.16–1.19 |
| Flash Point (PMCC, °C) | 145–155 |
| Storage Stability | ≥12 months at 25°C in sealed container |
Q1: What is the primary function of Wanhua HB-100 in coating and adhesive formulations?
A: Wanhua HB-100 is a biuret-type aliphatic polyisocyanate curing agent designed to react with hydroxyl-functional resins (e.g., acrylics, polyesters, or polyethers) to form crosslinked, high-performance thermoset films. It delivers excellent gloss retention, UV stability, and chemical resistance—particularly suited for premium industrial and automotive topcoats.
Q2: How does HB-100 compare to traditional HDI trimer curing agents in terms of viscosity and handling?
A: As a biuret structure, HB-100 typically exhibits lower viscosity than many HDI trimers at comparable NCO content, facilitating easier formulation blending, improved pot life control, and enhanced compatibility with solvent-based and high-solids systems without requiring excessive dilution.
Q3: Is HB-100 suitable for low-VOC or high-solids applications?
A: Yes—HB-100 is commonly used in high-solids and reduced-solvent coating systems due to its favorable reactivity profile and compatibility with modern resin technologies. Its biuret structure supports good film formation and cure efficiency even under moderate baking conditions, aligning well with VOC-reduction initiatives.
Q4: What are typical storage and handling recommendations for this product?
A: Store in tightly sealed containers under dry, cool, and well-ventilated conditions, away from moisture, heat sources, and strong oxidizers. Prolonged exposure to ambient humidity may lead to surface haze or gelation; therefore, inert gas blanketing (e.g., nitrogen) is recommended for long-term storage or partial-container usage.
Q5: Can HB-100 be used in two-component (2K) waterborne systems?
A: While primarily formulated for solvent-borne and high-solids systems, HB-100 can be incorporated into certain 2K waterborne coatings when paired with compatible dispersions and stabilized via proper emulsification or dispersion techniques. Performance validation—including pot life, film clarity, and final properties—must be confirmed experimentally for each specific system.
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