Overview
Hydroxypropyl Acrylate (HPA) is a monofunctional acrylic monomer with a hydroxyl group, making it highly reactive in polymerization reactions. It is widely used in industrial formulations due to its ability to improve adhesion, flexibility, and chemical resistance in end products. As a key raw material in the chemical industry, HPA is synthesized through the esterification of acrylic acid with propylene oxide. Its unique structure allows it to participate in both free-radical and condensation polymerization, making it indispensable in advanced coating and adhesive systems.
Physical and Chemical Properties
HPA is a low-viscosity liquid with a mild acrylic odor. Its hydroxyl group enables hydrogen bonding, enhancing compatibility with polar substrates. The monomer’s low glass transition temperature (Tg) contributes to the flexibility of cured polymers. Chemically, HPA is sensitive to light and heat, requiring stabilizers (e.g., hydroquinone) to prevent premature polymerization. It exhibits moderate volatility and should be handled in well-ventilated areas to avoid vapor accumulation.
Main Applications
HPA is a critical component in UV-curable coatings and inks, where it accelerates curing and improves substrate adhesion. In pressure-sensitive adhesives, it enhances tack and peel strength. The textile industry uses HPA as a cross-linker for fabric coatings, providing wrinkle resistance and durability. It also serves as a modifier in acrylic resins for automotive and construction coatings, offering weatherability and scratch resistance.
Safety and Storage
HPA is classified as a skin and eye irritant (GHS Category 2). Proper PPE—gloves, goggles, and respirators—is mandatory during handling. Storage requires inert atmospheres (nitrogen blanket) and temperatures below 25°C to inhibit polymerization. In case of spills, absorb with inert material and dispose of as hazardous waste. Firefighting measures include alcohol-resistant foam due to its flammability (flash point: 75°C).
B2B Procurement Guide
When sourcing HPA, prioritize suppliers with ISO 9001 certification and REACH compliance. Bulk shipments (200 kg drums or IBC totes) typically offer cost advantages. Test certificates should confirm purity (≥98%) and inhibitor content (200–400 ppm MEHQ). For global procurement, consider regional regulations: China’s GB standards, EU’s REACH, and US EPA compliance. Negotiate MOQs (10+ metric tons) for competitive pricing and ensure logistics partners specialize in hazardous chemical transport.
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