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Low-VOC, waterborne aliphatic polyisocyanate crosslinker compliant with stringent global environmental regulations.
Excellent hydrolytic stability for extended pot life and reliable storage in aqueous dispersions.
Fast ambient- and forced-dry curing performance without requiring high-bake conditions.
Delivers outstanding gloss retention, UV resistance, and weatherability in final coatings.
Compatible with a broad range of acrylic, polyester, and hybrid waterborne resins.
Architectural wall paints requiring durable, low-emission finishes.
Industrial maintenance coatings for metal substrates in mild to moderate exposure environments.
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.
| Chemical Type | Aliphatic polyisocyanate (HDI-based), anionic dispersion |
| Product Form | Opaque white to off-white aqueous dispersion |
| Appearance | Homogeneous liquid, no phase separation |
| NCO Content (wt %) | Approx. 7.5–8.5% |
| pH (at 25 °C) | 7.5–8.5 |
| Solids Content (wt %) | 32–36% |
| Viscosity (mPa·s, 23 °C, Brookfield RVT, Spindle #3, 20 rpm) | 150–400 |
| Primary Applications | Waterborne 2K polyurethane topcoats for architectural, industrial, wood, and plastic substrates |
Q1: What is the primary function of Bayhydur VP LS 2240 in waterborne coating systems?
A: Bayhydur VP LS 2240 is a hydrophilically modified aliphatic polyisocyanate curing agent designed to react with waterborne polyols and dispersions. It enables the formation of durable, crosslinked polyurethane films with excellent gloss retention, chemical resistance, and mechanical performance—without requiring organic co-solvents for stabilization.
Q2: Is Bayhydur VP LS 2240 compatible with common waterborne acrylic and polyester polyol dispersions?
A: Yes, it demonstrates broad compatibility with a wide range of anionic and non-ionic waterborne polyols—including acrylics, polyesters, and hybrid dispersions—due to its tailored hydrophilic modification and low viscosity. Compatibility should always be verified experimentally in the final formulation to ensure storage stability and film formation.
Q3: How does Bayhydur VP LS 2240 contribute to low-VOC compliance?
A: As a solvent-free, water-dispersible curing agent, Bayhydur VP LS 2240 eliminates the need for high-boiling solvents typically used in conventional polyisocyanates. Its formulation supports VOC levels well below regulatory thresholds for industrial maintenance and architectural coatings when paired with compliant waterborne resins.
Q4: What are the recommended handling and storage conditions?
A: Store in tightly sealed containers under dry, cool conditions (10–25 °C) and protect from moisture, heat, and direct sunlight. Avoid prolonged exposure to ambient humidity during handling, as this may affect dispersion stability or shelf life. Always follow Covestro’s Safety Data Sheet for safe industrial use.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
