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Unsaturated Polyester Resin Expands Application Boundary
PE unsaturated polyester resin is room-temperature curable polymer widely used in coatings and composite materials. It is synthesized by polycondensation of polyols and unsaturated dibasic acids. Adjusting acid value and molecular weight with reactive diluents controls hardness and toughness after curing. The polymerization endpoint is strictly controlled in production to prevent by-products from damaging storage stability, and finished products are sealed to avoid premature gelation. For coatings, it is applied in high-solid protective coatings featuring fast curing, high hardness and outstanding wear resistance. In composite fields, it is reinforced with fillers for structural parts. Matched curing agents and additives adjust curing time for construction under various temperatures. Industrial popularization introduces storage rules and proportion specifications to prevent incomplete curing caused by wrong mixing ratio. R&D targets low-shrinkage and low-styrene-release resin systems to cut volatile emission during production and application. Standardized tests evaluate shrinkage and impact strength. Segmented downstream demands promote customized formula development. Unsaturated polyester resin will continuously optimize eco-friendly formulas, balance molding efficiency and safety and explore more industrial coating scenarios.
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