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High-performance aliphatic polyisocyanate dispersion for waterborne two-component polyurethane systems.
Excellent hydrolytic stability and storage stability in aqueous media.
Low VOC content, compliant with stringent environmental regulations including EU Ecolabel and U.S. EPA standards.
Enables fast curing at ambient temperature with good early hardness development.
Delivers superior gloss retention, UV resistance, and chemical resistance in final coatings.
Architectural wall and ceiling coatings requiring high durability and low emissions.
Industrial maintenance coatings for metal substrates in transportation and infrastructure sectors.
Wood coatings for furniture, flooring, and cabinetry where clarity and yellowing resistance are critical.
Plastic coatings for automotive interior trim and consumer electronics housings.
High-end decorative and protective clearcoats for premium architectural and industrial applications.
| Chemical Type | Aliphatic polyisocyanate (HDI-based) dispersion |
| Product Form | Opaque white to slightly yellow liquid |
| Appearance | Homogeneous aqueous dispersion |
| NCO Content (wt %) | 6.8 – 7.2 |
| pH (at 20 °C) | 7.0 – 8.5 |
| Viscosity (mPa·s, 23 °C, Brookfield RVT, spindle #3, 20 rpm) | 150 – 350 |
| Solids Content (wt %) | 28 – 32 |
| Density (g/cm³, 20 °C) | 1.03 – 1.07 |
Q1: What is the primary chemical composition of Bayhydur XP 2547?
A: Bayhydur XP 2547 is an aliphatic polyisocyanate crosslinker based on hexamethylene diisocyanate (HDI) trimer chemistry, specifically formulated as a stable, anionic water-dispersible dispersion for use in waterborne coating systems.
Q2: How does Bayhydur XP 2547 differ from solvent-based HDI curing agents?
A: Unlike solvent-based HDI trimers, Bayhydur XP 2547 is engineered for compatibility with aqueous polymer dispersions and offers reduced VOC content, improved handling safety, and enhanced storage stability in waterborne formulations—without requiring organic co-solvents for dispersion.
Q3: Which types of resins is Bayhydur XP 2547 typically compatible with?
A: It is designed to react efficiently with waterborne hydroxyl-functional acrylics, polyesters, and hybrid dispersions. Compatibility should be confirmed through small-scale formulation testing, particularly regarding pot life, film formation, and final cure performance.
Q4: What are key handling and storage recommendations?
A: Store in tightly sealed original containers at temperatures between 5 °C and 30 °C, protected from freezing and direct sunlight. Avoid prolonged exposure to high humidity or contamination with acids, amines, or metal ions, which may destabilize the dispersion.
Q5: Can Bayhydur XP 2547 be used in low-temperature curing applications?
A: Yes—it supports ambient and forced-dry curing conditions, and its reactivity profile allows for acceptable crosslinking at temperatures as low as 15 °C, though full property development typically benefits from moderate thermal post-cure (e.g., 40–60 °C).
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E-mail: wangxingqiang@ericwchem.com
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