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High-performance aliphatic polyisocyanate dispersion for waterborne two-component polyurethane systems.
Excellent compatibility with a wide range of waterborne polyols, including acrylics, polyesters, and polyethers.
Low VOC content, supporting compliance with stringent environmental regulations (e.g., EU REACH, US EPA).
Good pot life stability at ambient temperature when mixed with suitable waterborne polyols.
Delivers superior hardness development, chemical resistance, and gloss retention in cured films.
Architectural and industrial maintenance coatings.
Waterborne wood coatings for furniture and flooring.
Automotive refinish clearcoats and basecoat/clearcoat systems.
Plastic coatings for interior automotive parts and consumer electronics.
General-purpose protective coatings for metal and concrete substrates.
| Chemical Type | Aliphatic polyisocyanate dispersion (HDI-based) |
| Product Form | Opaque white to slightly yellow liquid |
| Appearance | Homogeneous dispersion, no phase separation |
| Solids Content (wt. %) | 35–37 % |
| NCO Content (wt. %) | 4.2–4.6 % |
| pH Value | 7.0–8.5 |
| Density (20 °C) | 1.08–1.12 g/cm³ |
| Viscosity (23 °C) | 150–300 mPa·s (Brookfield LVT, spindle #3, 6 rpm) |
Q1: What is the primary chemical composition of Bayhydur XP 2655?
A: Bayhydur XP 2655 is an aliphatic polyisocyanate crosslinker based on hexamethylene diisocyanate (HDI) trimer chemistry, specifically formulated as a water-dispersible, non-ionic dispersion for use in aqueous two-component polyurethane systems.
Q2: How does Bayhydur XP 2655 differ from solvent-based HDI trimers in terms of application performance?
A: Unlike solvent-based counterparts, Bayhydur XP 2655 enables formulation of low-VOC, waterborne coatings with comparable film hardness, chemical resistance, and gloss retention—while offering improved handling safety and reduced environmental impact during manufacturing and application.
Q3: What types of resins is Bayhydur XP 2655 typically compatible with?
A: It is designed to react efficiently with waterborne hydroxyl-functional acrylics, polyesters, and hybrid dispersions. Compatibility and pot life depend on resin selection, pH, and the presence of co-solvents or surfactants—formulation screening is recommended.
Q4: What are typical storage conditions and shelf life considerations?
A: Store in tightly sealed original containers at temperatures between 5 °C and 30 °C, protected from frost and direct sunlight. Under proper storage conditions, the product maintains stability for up to 12 months; however, viscosity and dispersion quality should be verified prior to use after extended storage.
Q5: Can Bayhydur XP 2655 be used in coatings requiring FDA compliance for indirect food contact?
A: Bayhydur XP 2655 is not pre-approved for food-contact applications. Its suitability for such uses depends on full formulation evaluation, including final cured-film migration testing and regulatory review by qualified experts—Covestro does not provide blanket food-contact certifications for this grade.
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E-mail: wangxingqiang@ericwchem.com
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