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Low-viscosity liquid form enabling easy handling and homogeneous mixing with polyol systems.
Excellent storage stability with extended pot life under ambient conditions.
Provides superior mechanical strength and chemical resistance in cured polyurethane coatings.
Low monomer (HDI) content meeting stringent VOC and regulatory requirements for industrial applications.
Consistent reactivity profile ensuring reliable cure kinetics across diverse formulation platforms.
High-performance automotive clearcoats and basecoats.
Industrial maintenance coatings for metal and concrete substrates.
Architectural and decorative polyurethane topcoats.
Plastic coatings requiring flexibility and abrasion resistance.
Wood finishing systems demanding gloss retention and yellowing resistance.
| Chemical Type | HDI-based biuret oligomer |
| Product Form | Clear, colorless to pale yellow liquid |
| Appearance | Homogeneous, transparent liquid without sediment |
| NCO Content (wt%) | 18.5–19.5 |
| Viscosity (25°C, mPa·s) | 800–1,200 |
| Density (25°C, g/cm³) | 1.14–1.18 |
| Flash Point (°C, closed cup) | 135–145 |
| Storage Stability (unopened, 25°C) | ≥12 months |
Q1: What is the primary function of Wanhua HB-75MX in polyurethane coating systems?
A: Wanhua HB-75MX is a low-viscosity HDI biuret-based curing agent designed to react with hydroxyl-functional resins (e.g., acrylics, polyesters) to form durable, flexible, and chemically resistant polyurethane coatings. It enables ambient or low-bake crosslinking with excellent gloss retention and weathering performance.
Q2: How does HB-75MX compare to traditional HDI isocyanurate curing agents in terms of reactivity and film properties?
A: As a biuret-type hardener, HB-75MX offers moderate reactivity—slower than isocyanurates but faster than monomeric HDI—providing extended pot life while maintaining good through-cure. Films exhibit balanced hardness, flexibility, and resistance to yellowing, making it especially suitable for high-gloss decorative and protective topcoats.
Q3: Is HB-75MX compatible with moisture-cure or one-component polyurethane systems?
A: No—HB-75MX is strictly intended for two-component (2K) polyurethane systems where it serves as the isocyanate component. It is not formulated for moisture-cure applications and requires precise metering and mixing with hydroxyl-terminated resins prior to application.
Q4: What are the recommended storage conditions to maintain product stability?
A: Store HB-75MX in tightly sealed original containers under dry, cool, and well-ventilated conditions, away from moisture, heat sources, and direct sunlight. Prolonged exposure to humidity or elevated temperatures may lead to viscosity increase or gelation due to premature reaction with water.
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E-mail: wangxingqiang@ericwchem.com
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