Water-based Hydroxyl Acrylic Dispersion for Two-component Polyurethane Coatings with Salt Spray Resistance, Acid and Alkali Resistance, and Long Initial Water Resistance Time

. Core Product Profile​​

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  A water-based hydroxyl acrylic dispersion designed for formulating high-performance ​​two-component polyurethane coatings​​ when combined with a water-based isocyanate curing agent.
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  Primarily used for ​​topcoats​​ and ​​clear finishes​​ on various metal substrates. Also suitable as a resin for ​​integrated primer-topcoat systems​​.

​​2. Key Performance Features​​

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  ​​Superior protection​​: Excellent ​​water resistance, salt spray resistance, acid and alkali resistance​​, along with a relatively long initial water resistance time, making it ideal for outdoor applications and harsh environments.
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  ​​Excellent adhesion​​: Performs well on a variety of substrates.
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  ​​High cost-effectiveness​​: Offers high performance at a competitive cost.
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  ​​Strong compatibility​​: Can be paired with both ​​water-based​​ and ​​solvent-based​​ curing agents, providing formulation flexibility.

​​3. Physical Properties​​

​​4. Application Guidelines​​

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  ​​Recommended co-solvents​​:
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    ​​For main agent​​: DPNB, PNB, DBG, BG
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    ​​For dilution​​: PGDA, PMA, PMA+DBE (1:1 or 1:2 mixture)
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  ​​Important notes​​:
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    High initial viscosity after mixing A/B components may ​​shorten the pot life​​.
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    ​​Not recommended for paste grinding​​ due to potential stability issues that may impact performance.
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  ​​Viscosity adjustment​​: If viscosity decreases during storage (due to pH drop), it can be readjusted by adding a ​​10%-20% diluted DMEA aqueous solution​​.

​​5. Testing Example​​

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  ​​Recommended curing agent​​: WL-AC300 (for primer-topcoat systems)
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  ​​Mixing ratio​​: 4 : 1 (base resin : curing agent)
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  ​​Film thickness control​​: Up to 85μm without pinholes.
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  ​​Curing process​​: Baking at 80℃ for 2-4 hours followed by ambient curing for 1-7 days results in excellent salt spray resistance.
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​​6. Packaging & Storage​​

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  ​​Packaging​​: 20KG/200KG/1000KG wide-mouth plastic drums, or customized per customer requirements.
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  ​​Shelf life​​: 6 months.
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  ​​Storage conditions​​: Store in sealed containers, protected from freezing and high temperatures. Recommended storage temperature: ​​5~35℃​​.
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  ​​Usage recommendation​​: Use shortly after opening.