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High hydroxyl functionality (OH value: 85–95 mg KOH/g) for robust crosslinking with melamine and polyisocyanate curing agents.
Excellent compatibility with common solvent-based coating systems, including nitrocellulose, alkyd, and polyester resins.
Low viscosity (25–35 mPa·s at 25°C, 60% in xylene) enabling high-solids formulation and improved spray atomization.
Superior weather resistance and UV stability due to fully acrylic backbone—minimal yellowing under prolonged exposure.
Consistent batch-to-batch reproducibility supported by strict in-process GC and GPC quality control.
Automotive OEM topcoats and refinish clearcoats requiring high gloss and mar resistance.
Industrial maintenance coatings for metal substrates exposed to outdoor or corrosive environments.
General-purpose coil coatings where excellent film flexibility and adhesion on pre-painted steel are essential.
High-performance plastic coatings for automotive interior trim and electronic housings.
Two-component polyurethane wood finishes demanding rapid cure development and hardness build.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Xylene / butyl acetate blend |
| Solids Content | 60 ± 1 wt% (by weight, ASTM D2369) |
| Hydroxyl Value | 85–95 mg KOH/g (ASTM D4290) |
| Acid Value | < 5 mg KOH/g (ASTM D1639) |
| Viscosity (25°C, 60% in xylene) | 25–35 mPa·s (ASTM D1084) |
Q1: What is the primary function of YPWA-25W60 in coating formulations?
A: YPWA-25W60 serves as a hydroxyl-functional acrylic resin designed to act as a reactive binder in two-component polyurethane and polyester-based coating systems. It contributes to film formation, crosslink density, and enhances mechanical properties such as hardness, flexibility, and chemical resistance.
Q2: Is YPWA-25W60 compatible with common isocyanate hardeners?
A: Yes, YPWA-25W60 is formulated for compatibility with aliphatic and aromatic isocyanate crosslinkers, including HDI trimer and IPDI-based hardeners. Optimal performance is achieved when matched with standard industrial-grade polyisocyanates used in high-performance coatings.
Q3: How does YPWA-25W60 perform in waterborne versus solventborne systems?
A: YPWA-25W60 is specifically engineered for waterborne systems, offering good colloidal stability and compatibility with common co-solvents and dispersants. While it can be adapted to solventborne applications with appropriate formulation adjustments, its performance advantages—such as low VOC contribution and efficient dispersion—are most pronounced in aqueous environments.
Q4: What are typical storage conditions and shelf life recommendations?
A: Store YPWA-25W60 in tightly sealed containers at temperatures between 5 °C and 30 °C, away from direct sunlight and freezing conditions. Under proper storage, the recommended shelf life is 12 months from the date of manufacture. Prior to use, inspect for signs of phase separation or viscosity change and stir gently if needed.
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