环氧树脂是泛指分子中含有两个或两个以上环氧基团的有机化合物，除个别外，它们的相对分子质量都不高。环氧树脂的分子结构是以分子链中含有活泼的环氧 基团为其特征，环氧基团可以位于分子链的末端、中间或成环状结构。由于分子结构中含有活泼的环氧基团，使它们可与多种类型的固化剂发生交联反应而形成不溶 的具有三向网状结构的高聚物。凡分子结构中含有环氧基团的高分子化合物统称为环氧树脂。固化后的环氧树脂具有良好的物理、化学性能，它对金属和非金属材料 的表面具有优异的粘接强度，介电性能良好，变定收缩率小，制品尺寸稳定性好，硬度高，柔韧性较好，对碱及大部分溶剂稳定，因而广泛应用于国防、国民经济各 部门，作浇注、浸渍、层压料、粘接剂、涂料等用途。

　　Epoxy resin is refers to molecules containing two or more than two epoxy groups of organic compounds, in addition to individual, their relative molecular quality are not high. The molecular structure of the epoxy resin is characterized by the active epoxy groups in the molecular chain, which can be located at the end of the molecular chain, the middle or the ring like structure. Because of the active epoxy groups in the molecular structure, they can be formed with a three - to - network structure with a variety of types of curing agents. Where the molecular structure of the polymer containing epoxy groups are collectively referred to as the epoxy resin. Epoxy resin has good physical and chemical properties, it has excellent bonding strength, dielectric properties, high hardness, high hardness, good flexibility and good flexibility. So it is widely used in national defense and national economy.