Maleic Anhydride For Unsaturated Polyester Resin

Xiamen Ditai Chemicals Co., Ltd. is one of the most reliable manufacturers and suppliers of maleic anhydride for unsaturated polyester resin in China. Welcome to buy high quality chemical products at competitive price from our factory.

Maleic anhydride is a colorless or white solid with an acidic taste at room temperature, and its molecular formula is C4H2O3.

In the unsaturated polyester resin industry, maleic anhydride is a core raw material used in the esterification process with glycols and other dibasic acids. Its reactive double bond structure allows the resulting resin to crosslink effectively during curing, which is essential for achieving the required mechanical strength and chemical resistance of finished products. When applied as maleic anhydride for unsaturated polyester resin, consistent purity and stable reactivity help manufacturers maintain predictable reaction rates and resin viscosity, which are critical for large-scale continuous production. From an industry perspective, demand for unsaturated polyester resins continues to be driven by construction, marine, automotive and composite materials sectors, particularly in fiberglass-reinforced applications. Producers in these segments place strong emphasis on raw material reliability, as fluctuations in quality can directly impact resin color, curing behavior and final product performance. As a result, maleic anhydride used in this field is typically sourced from suppliers capable of delivering steady quality, standardized specifications and long-term supply stability to support ongoing industrial production.

In practical production, the material is commonly charged into esterification reactors at 60–70 °C after pre-melting, ensuring smooth feeding and avoiding local overheating. Many resin plants use it in continuous UPR lines where stable batch-to-batch behavior is required to keep gel time and viscosity within narrow control limits.

Maleic anhydride is reactive with moisture and can cause irritation on contact. It should be handled following proper safety practices, including the use of protective equipment and adequate ventilation. Store in a cool, dry place, away from direct heat and incompatible substances.

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