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High hydroxyl functionality for excellent crosslink density with melamine and polyisocyanate curing agents.
Low viscosity in high-solids formulation, enabling reduced VOC content and improved application efficiency.
Outstanding gloss retention and color stability under UV exposure and weathering conditions.
Good compatibility with common automotive and industrial coating resins and additives.
Consistent batch-to-batch reproducibility meeting stringent OEM quality requirements.
Automotive OEM clearcoats and basecoats.
Refinish topcoats for passenger vehicles and light-duty trucks.
Industrial maintenance coatings for metal substrates.
High-performance coil coatings requiring durability and flexibility.
Premium architectural metal finishes for façades and roofing systems.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | 70% BAC (Butyl Acetate), balance aromatic hydrocarbons |
| Hydroxyl Value (mg KOH/g) | 65–75 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (wt %) | 70 ± 1 |
| Viscosity (25°C, mPa·s, Brookfield LV, Spindle #3, 60 rpm) | 4,000–7,000 |
Q1: What is the primary function of MACRYNAL SM 2815 70BAC in coating formulations?
A: MACRYNAL SM 2815 70BAC serves as a hydroxyl-functional acrylic resin designed to act as a reactive binder in two-component polyurethane and polyester systems. It contributes to film formation, crosslink density, hardness development, and chemical resistance while maintaining good clarity and UV stability.
Q2: Which types of crosslinkers are compatible with this resin?
A: This resin is formulated for use with standard aliphatic and aromatic isocyanate crosslinkers—particularly HDI-based trimer and biuret types—as well as melamine-formaldehyde resins under appropriate acid catalysis. Compatibility should be verified experimentally for specific formulation conditions.
Q3: How does the 70% solids content influence formulation handling and VOC management?
A: The 70% non-volatile content enables higher solids loading per unit volume compared to lower-solids alternatives, supporting reduced solvent demand and lower overall VOC emissions in compliant coating systems. Solvent selection and viscosity adjustment should be tailored to application method and regulatory requirements.
Q4: Is this resin suitable for high-performance industrial maintenance or automotive refinish applications?
A: Yes—it is commonly employed in demanding industrial maintenance coatings and mid-to-high-tier refinish systems where excellent gloss retention, flexibility, and resistance to weathering and solvents are required. Performance outcomes depend on full system design, including crosslinker choice, catalyst level, and cure schedule.
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