Epoxy resin is a kind of high polymer, the molecular formula is (C11H12O3) N, refers to the molecule containing more than two epoxy groups of a polymer. It is A polycondensation product of epichlorohydrin and bisphenol A or polyol. Because of the chemical activity of the epoxy group, it can be opened by a variety of compounds containing active hydrogen, cured and crosslinked to form a network structure, so it is a thermosetting resin. Bisphenol A epoxy resin is not only the largest yield, variety, and new modified varieties are still increasing, the quality is constantly improving.