Solvent Based Solid Acrylic Resin For PU Primer

Primers are the foundation of a coating system, ensuring the adhesion, durability, and surface finish of subsequent coatings. Whether it's a UV primer or a PU primer, resin selection is crucial to meeting performance requirements. Solid acrylic resins have become a key raw material class in primer formulations due to their excellent balance of adhesion, clarity, durability, and compatibility with various curing systems.

Solid acrylic resins, when used in UV primers, offer the following properties:

• Excellent adhesion to plastics, wood, and other substrates, ensuring secure adhesion of UV topcoats.
• High clarity and leveling properties enable topcoats to achieve exceptional gloss and decorative effects.
• Non-yellowing stability, essential for clear or light-colored UV topcoats.
• Scratch and chemical resistance, providing durability even in thin primer layers.
• Compatibility with UV-curing topcoats, ensuring good intercoat adhesion and smooth cure.

These properties make solid acrylic resins particularly valuable in wood finishing, electronic component coatings, and plastic coatings (UV coatings used as topcoats).

For polyurethane (PU) primers, solid acrylic resins (particularly hydroxy-functional grades) are often chosen for their ability to chemically react with isocyanates to form a cross-linked film. Their advantages include:

• Strong adhesion to metal, plastic, and wood, reducing the risk of delamination.
• Balanced hardness and flexibility, resisting mechanical stress while preventing embrittlement.
• Excellent chemical and solvent resistance, making them essential for automotive and industrial applications.
• Weather resistance, ensuring long-term performance in outdoor environments.
• A smooth surface finish, giving polyurethane topcoats a uniform appearance and durability.

These properties make solid acrylic resins indispensable in high-performance coatings, where toughness, durability, and protective properties are crucial.

Product Description

SA-539 is a thermoplastic solid acrylic resin based on MMA and n-BMA. It features a medium molecular weight (80,000), a high Tg (84°C), a low acid number (≤3), and a hydroxyl number of 27.5, offering numerous advantages for UV and PU primers. SA-539's high gloss, hardness, and abrasion resistance provide a durable, smooth base layer, enhancing the appearance and protective properties of UV topcoats. Solvent based acrylic resin has strong adhesion and excellent dispersibility ensure uniform film formation and compatibility with metal or pigment systems. The hydroxyl functional groups chemically crosslink with the isocyanate in PU primers, providing excellent hardness, flexibility, and long-term chemical resistance. Solid acrylic resin SA-539 also exhibits good alcohol resistance, weathering resistance, and non-yellowing stability, enabling primers to achieve superior adhesion, durability, and aesthetics in demanding applications such as automotive, appliance, and plastic coatings.

‌Key Features‌

• High alcohol resistance
• High gloss
• High hardness
• Strong abrasion resistance
• High adhesion
• Excellent dispersion and weather resistance
• Well-arranged silver powder

Recommended Applications‌

Appliance paint, plastic paint, automotive refinish paint, and functional inks

Physical Property

Solubility

Dissolution rate

Aceton*> Butanone > Ethyl acetate > Toluene > Butyl acetate > Xylene

Compatibility

It has good Compatibility with alkyd resin, perchlorethylene resin, nitrocellulose, cellulose acetate butyrate, etc.

Packaging Details

25kgs/Bag

Storage

This product should be stored in a dry, ventilated place to avoid moisture.

High Hardness Solvent Based Solid Acrylic Resin For PU Primer–High Adhesion & Weather Resistance Images