Overview
Hydroxyethyl acrylate (HEA) is a monofunctional acrylic monomer with a hydroxyl group, making it highly reactive and useful in polymerization processes. It is commonly employed in industrial applications due to its ability to improve adhesion, flexibility, and durability in final products. HEA is a key ingredient in UV-curable coatings, pressure-sensitive adhesives, and water-based resins. HEA is favored for its low volatility and compatibility with other monomers, allowing for versatile formulations. Its chemical structure enables cross-linking reactions, enhancing the performance of coatings and adhesives. The monomer is typically supplied as a colorless liquid with a mild acrylic odor.
Physical and Chemical Properties
Hydroxyethyl acrylate is a colorless liquid with a molecular weight of 116.12 g/mol and a density of 1.109 g/cm³. It has a melting point of -60°C and boils at 90-92°C under reduced pressure (5 mmHg). The compound is miscible with water and most organic solvents, facilitating its use in aqueous and solvent-based systems. HEA's hydroxyl group provides sites for further chemical modification, such as esterification or cross-linking with isocyanates. Its reactivity makes it suitable for free-radical polymerization, often initiated by heat or UV light. The monomer should be stored away from light and heat to prevent premature polymerization.
Main Applications
HEA is widely used in the production of coatings, adhesives, and resins. In coatings, it enhances UV curability, adhesion, and weather resistance. It is a critical component in automotive, industrial, and decorative coatings. In adhesives, HEA improves tack and cohesion, making it ideal for pressure-sensitive tapes and labels. The textile industry utilizes HEA to modify fibers, imparting water resistance and durability. Photopolymers for 3D printing and dental materials also incorporate HEA for its cross-linking properties. Additionally, HEA serves as a reactive diluent in epoxy and polyurethane systems, reducing viscosity without compromising performance.
Safety and Storage
Hydroxyethyl acrylate is classified as an irritant and can cause skin and eye irritation upon contact. Proper personal protective equipment (PPE), including gloves and goggles, is essential when handling HEA. Inhalation of vapors should be avoided, and work areas must be well-ventilated. Storage conditions are critical to maintaining HEA's stability. It should be kept in a cool, dry place, away from direct sunlight and heat sources. Inhibitors like hydroquinone monomethyl ether (MEHQ) are often added to prevent polymerization during storage. Containers should be tightly sealed and labeled to avoid accidental exposure.
B2B Procurement Guide
When procuring hydroxyethyl acrylate, buyers should verify the CAS number (818-61-1) to ensure product authenticity. Purity levels, typically ranging from 96% to 99%, should align with application requirements. Reputable suppliers will provide technical data sheets (TDS) and material safety data sheets (MSDS). Bulk purchases (e.g., drums or totes) often yield cost savings, but buyers should confirm storage capabilities. Logistics considerations include shipping regulations for hazardous chemicals. Establishing long-term contracts with reliable suppliers can stabilize pricing and ensure consistent quality. Buyers should also inquire about customization options, such as inhibitor concentrations or blended formulations.
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