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High hydroxyl functionality for excellent crosslinking efficiency with melamine and polyisocyanate curing agents.
Outstanding weather resistance and UV stability, suitable for long-term outdoor exposure.
Low viscosity at high solids content, enabling high-solids formulation with improved VOC reduction.
Superior compatibility with common acrylic, polyester, and epoxy resins in hybrid coating systems.
Consistent batch-to-batch performance and narrow molecular weight distribution for reliable film formation.
Automotive OEM and refinish topcoats requiring high gloss and durability.
Industrial maintenance coatings for metal structures and equipment.
Architectural coatings including premium exterior wall and façade finishes.
Plastic coatings for automotive interior and exterior trim components.
Can coatings for beverage and food containers requiring FDA-compliant formulations.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear to slightly hazy, pale yellow liquid |
| Solids Content (wt%) | 55 ± 2% |
| Hydroxyl Value (mg KOH/g) | 75–85 |
| Acid Value (mg KOH/g) | < 10 |
| Viscosity (Brookfield, 25°C, sp4, 20 rpm) | 4,000–6,000 cP |
| Primary Solvent | Xylene / butyl acetate blend |
Q1: What is the primary function of Nengda AC3665 in coating formulations?
A: Nengda AC3665 serves as a hydroxyl-functional acrylic resin that acts as a reactive binder in two-component polyurethane and polyester-based coating systems. It contributes to crosslink density, enhancing hardness, chemical resistance, and film integrity upon curing.
Q2: Is Nengda AC3665 compatible with common isocyanate crosslinkers?
A: Yes, it is specifically designed for compatibility with aliphatic and aromatic polyisocyanates, including HDI trimer, IPDI biuret, and TDI-based hardeners. Optimal reactivity and pot life are achieved when matched with standard commercial crosslinkers under typical ambient or forced-dry conditions.
Q3: How does Nengda AC3665 perform in high-solids and low-VOC formulations?
A: Its relatively low viscosity and high hydroxyl value enable efficient formulation of high-solids coatings without excessive solvent demand. It supports VOC reduction strategies while maintaining good flow, leveling, and crosslink efficiency in compliant systems.
Q4: Can Nengda AC3665 be used in automotive refinish or industrial maintenance coatings?
A: Yes — it is widely employed in mid-to-high performance industrial maintenance, general metal finishing, and automotive refinish applications where balanced cure speed, gloss retention, and substrate adhesion are required. Formulators often select it for its reproducible reactivity and compatibility with pigment dispersions and additives.
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