DOW Chemical AU-608 is a powdered hydroxyl acrylic resin in the PARALOID™ series, developed for high-performance two-component polyurethane coatings. Made by advanced polymerization process, its powder form enables precise metering and clean processing. When cross-linked with aliphatic isocyanates, the film has high hardness
Isocyanate-Free Environmental Formula - Avoid health risks and meet low VOC environmental regulation requirementsDow Inc.
Room Temperature Cross-Linking Curing - No forced drying or baking required, reducing energy consumption and adapting to various construction scenariosDow Inc.
Powder Form Advantages - Uniform particles, precise metering, safe storage and transportation, less processing pollution
Excellent Performance Balance - The formed film has both hardness and flexibility, strong adhesion, outstanding weather resistance and chemical resistance
Industrial Protective Topcoats - Suitable for long-lasting protective and decorative topcoats of steel structures and construction machineryDow Inc.
Building Exterior Wall Coatings - Used for high-weather-resistant and environmentally friendly topcoats of building exterior walls to improve durability and decorativeness
Transportation Facilities Coating - Adaptable for high-performance protective topcoats of outdoor transportation facilities such as bridges and guardrails
Metal Products Coating - Used for chemical corrosion-resistant decorative coatings of hardware, home appliances and other metal products
| Brand | DOW Chemical |
| Chemical Type | Acrylic resin (acrylic curing agent) |
| Technology Type | Powder form, solvent-soluble type, high-solid content type |
| Appearance | Powder particles |
| Glass Transition Temperature (Tg) | 20 ℃ |
Q1: What is the primary function of DOW PARALOID AU-608 in coating formulations?
A: DOW PARALOID AU-608 is a specialty acrylic resin designed primarily as a rheology modifier and matting agent. It helps control viscosity, improve sag resistance, and deliver consistent, uniform matte finishes in solvent-borne and high-solids industrial coatings without significantly compromising clarity or film integrity.
Q2: Is AU-608 compatible with common crosslinkers used in thermoset coatings?
A: Yes, AU-608 exhibits good compatibility with standard amino resins (e.g., melamine-formaldehyde) and polyisocyanates commonly employed in baked and ambient-cure systems. Its acrylic backbone supports stable dispersion and minimal interference with crosslinking kinetics under typical formulation conditions.
Q3: How should AU-608 be incorporated into a coating formulation?
A: AU-608 is typically added during the let-down stage, after pigment grinding, and dispersed using moderate shear. It can be introduced either as a dry powder or pre-dispersed in a compatible solvent or resin solution. Good wetting and uniform distribution are essential to achieve optimal matting and rheological performance.
Q4: Does AU-608 affect the gloss retention or weatherability of finished coatings?
A: As a non-film-forming acrylic additive, AU-608 does not contribute directly to the polymer network but remains inert within the cured film. It generally maintains excellent gloss retention and does not negatively impact the inherent UV stability or weather resistance of high-performance acrylic or polyester-based coating systems.
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