December 22, 2025 (Zhejiang) – As a key material in high-end manufacturing, the synthesis mechanism of bisphenol A epoxy resin has long attracted industry attention. Recently, industry experts have comprehensively analyzed its synthetic "trio" centered on ring-opening, condensation and crosslinking through systematic research, providing important theoretical support for material performance optimization and industrial upgrading. It is reported that bisphenol A epoxy resin is formed by polycondensation of bisphenol A and epichlorohydrin under the action of alkaline catalysts. Although there are disputes about its reaction mechanism, the core reaction path has gradually become clear. The synthesis process alternates between multiple rounds of ring-opening and ring-closing reactions: the hydroxyl group of bisphenol A first undergoes a ring-opening reaction with the epoxy group of epichlorohydrin to generate an intermediate product containing chlorohydrin; this product reacts with sodium hydroxide to remove hydrogen chloride, completing the ring-closing to regenerate the epoxy group; the newly generated epoxy group then continues to open the ring with the hydroxyl group of bisphenol A, and this cycle continues until the target product with epoxy groups at both ends is formed. Notably, the dosage control of epichlorohydrin is crucial for the synthesis, and excessive feeding can ensure the continuous progress of the reaction. At the same time, it is necessary to guard against the interference of side reactions during the reaction, including epoxy group hydrolysis, abnormal addition and heterogeneous end group formation, which may affect product purity and performance. Experts said that this mechanism analysis provides a scientific basis for precise regulation of epoxy resin synthesis processes and improvement of product quality. Bisphenol A epoxy resin is widely used in insulating materials, composite materials and other fields due to its excellent adhesion and corrosion resistance. The optimization of its synthesis technology will further promote the development of the high-end manufacturing industry. In the future, the industry will continue to explore more efficient and environmentally friendly synthetic routes based on this mechanism research.
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