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Waterborne aliphatic polyisocyanate dispersion with low VOC and zero solvent content.
Excellent hydrolytic stability for extended pot life in aqueous two-component systems.
Enables fast ambient-cure performance without external heat or forced drying.
Delivers outstanding gloss retention, weather resistance, and UV stability in final coatings.
Compatible with a broad range of waterborne acrylic and polyurethane dispersions.
Architectural wall coatings requiring high durability and low environmental impact.
Industrial maintenance coatings for metal substrates in mild-to-moderate exposure conditions.
Wood coatings for interior furniture and cabinetry where low odor and rapid handling are critical.
Plastic coatings for automotive interior trim and consumer electronics housings.
General-purpose protective coatings for concrete and masonry surfaces.
| Chemical Type | Aliphatic polyisocyanate (HDI-based) dispersion |
| Product Form | Opaque white liquid |
| Appearance | Homogeneous aqueous dispersion |
| Primary Applications | Two-component waterborne topcoats and clearcoats |
| Key Features | Low-VOC, non-solvent, ambient-curing |
| Benefits | Reduced emissions, easy handling, excellent film formation |
| pH (at 25°C) | 7.0–8.5 |
| Storage Stability | ≥12 months at 5–30°C in sealed container |
Q1: What is the primary chemical composition of Bayhydur BL XP 2706?
A: Bayhydur BL XP 2706 is a water-dispersible aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry, modified with hydrophilic groups to enable stable dispersion in aqueous systems without added organic solvents or surfactants.
Q2: How does Bayhydur BL XP 2706 differ from solvent-based HDI curing agents in terms of application performance?
A: Unlike conventional solvent-borne HDI hardeners, Bayhydur BL XP 2706 enables formulation of low-VOC, high-performance waterborne two-component polyurethane coatings with good pot life, balanced reactivity, and excellent film properties—including hardness development, chemical resistance, and gloss retention—without compromising environmental compliance.
Q3: Which types of resins is Bayhydur BL XP 2706 typically compatible with?
A: It is specifically designed for use with waterborne polyacrylates, polyesters, and hybrid dispersions containing primary or secondary hydroxyl functionality. Compatibility and optimal crosslinking require matching the NCO:OH ratio and adjusting for resin hydroxyl value, pH, and particle size distribution.
Q4: What are key handling and storage recommendations for this curing agent?
A: Store in tightly sealed original containers at temperatures between 5 °C and 30 °C, protected from moisture, direct sunlight, and freezing. Avoid prolonged exposure to humid environments during handling, as premature reaction with ambient moisture may affect viscosity and shelf life.
Q5: Can Bayhydur BL XP 2706 be used in coatings requiring FDA-compliant or food-contact applications?
A: While Bayhydur BL XP 2706 itself is not pre-approved for direct food contact, it may be formulated into coatings that meet relevant regulatory requirements—subject to full system evaluation, appropriate post-cure conditions, and final validation by the coating formulator or end-user in accordance with applicable regional food-contact legislation.
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