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High hydroxyl functionality for excellent crosslinking efficiency with melamine and polyisocyanate curing agents.
Low VOC formulation compliant with stringent environmental regulations including EU Directive 2004/42/EC.
Superior gloss retention and long-term weatherability in outdoor coatings applications.
Excellent compatibility with common solvent-based acrylic and alkyd resin systems.
Consistent batch-to-batch reproducibility ensuring reliable manufacturing performance.
Automotive OEM clearcoats and topcoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring high durability and flexibility.
High-performance wood finishes for furniture and cabinetry.
Powder coating hybrid systems where solution acrylics enhance flow and leveling.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Aromatic-free (acetone/butyl acetate blend) |
| Hydroxyl Value (mg KOH/g) | 70–75 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% w/w) | 70 ± 1 |
| Viscosity (25°C, mPa·s) | 800–1200 (DIN 4 mm cup) |
Q1: What is the primary function of MACRYNAL SM 515 70BAC in coating formulations?
A: MACRYNAL SM 515 70BAC 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, hardness development, and chemical resistance upon curing with suitable isocyanate hardeners.
Q2: Is this resin compatible with common aliphatic isocyanate crosslinkers?
A: Yes, MACRYNAL SM 515 70BAC is formulated for compatibility with standard aliphatic polyisocyanates, including HDI-based trimers and biuretes. Its hydroxyl functionality enables efficient reaction under ambient or elevated temperature cure conditions, supporting high-gloss, durable finishes with good UV stability.
Q3: How does the 70% solids content influence formulation handling and VOC considerations?
A: With approximately 70% non-volatile content, MACRYNAL SM 515 70BAC offers a favorable balance between viscosity control and reduced solvent demand compared to lower-solids alternatives. This supports compliant formulations targeting lower VOC levels while maintaining workable rheology and application properties in industrial coatings.
Q4: Can it be used in both air-dry and forced-cure applications?
A: While MACRYNAL SM 515 70BAC requires chemical crosslinking for full performance, it is suitable for both ambient-cure and forced-cure (e.g., 60–80 °C) systems depending on the selected hardener and catalyst package. Cure speed and final properties are adjustable through formulation design and thermal input.
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