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Waterborne hydroxyl-functional acrylic resin designed for high-performance two-component polyurethane coatings.
Offers excellent compatibility with aliphatic isocyanates and standard coalescents.
Delivers outstanding gloss retention, hardness development, and chemical resistance after cure.
Low VOC formulation compliant with stringent environmental regulations including EU Directive 2004/42/EC.
Stable in neutral to slightly alkaline pH range, supporting robust storage and formulation flexibility.
Automotive refinish topcoats and clearcoats.
Industrial maintenance coatings for metal substrates.
General-purpose protective coatings for architectural and agricultural equipment.
Wood coatings requiring low-temperature cure and high durability.
Plastic coatings where flexibility and adhesion balance are critical.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Waterborne dispersion |
| Appearance | Clear to slightly hazy, colorless to pale yellow liquid |
| Solids Content (wt%) | 43 ± 1% |
| pH | 7.5 – 8.5 |
| Hydroxyl Value (mg KOH/g) | 65 – 75 |
| Viscosity (mPa·s, Brookfield RVT, #2 spindle, 20 rpm, 25°C) | 100 – 300 |
| Minimum Film Formation Temperature (MFFT) | ~25°C |
Q1: What is the primary function of MACRYNAL SM 6826w 43WA in coating formulations?
A: MACRYNAL SM 6826w 43WA is a waterborne hydroxyl-functional acrylic resin designed primarily as a reactive binder in two-component polyurethane and melamine-cured systems. It contributes to film formation, hardness development, chemical resistance, and gloss retention while enabling low-VOC, high-solids aqueous formulations.
Q2: Is this resin compatible with common crosslinkers used in industrial coatings?
A: Yes — it is formulated for compatibility with aliphatic isocyanate crosslinkers (e.g., HDI-based polyisocyanates) and amino resins such as partially methylated melamines. Compatibility and cure performance should be verified in the final formulation, particularly regarding pot life, viscosity stability, and film properties.
Q3: How does the "43WA" designation relate to its application performance?
A: The "43WA" suffix indicates that this grade is a waterborne dispersion with a target hydroxyl value range suitable for balanced reactivity and film flexibility in ambient- or forced-dry curing systems. It reflects Allnex’s internal classification for water-based hydroxyl acrylics optimized for industrial wood, plastic, and metal coatings requiring good flow, leveling, and adhesion.
Q4: Can MACRYNAL SM 6826w 43WA be used in direct-to-metal (DTM) applications?
A: It can be incorporated into DTM coating systems when combined with appropriate corrosion-inhibiting pigments, adhesion promoters, and crosslinkers. However, optimal performance in demanding DTM environments typically requires formulation optimization — including pH control, coalescent selection, and crosslinker stoichiometry — to ensure substrate wetting, intercoat adhesion, and long-term durability.
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