Adhesive is the main agent of adhesive, with a variety of curing agents, plasticizers and fillers and other additives prepared, which is closely related to our daily life, can be the same material contact surface or even different materials of contact surface for effective bonding, usually used for bonding crafts, furniture repair, glass sealing，In addition to traditional application fields, adhesives have broad prospects for development in emerging application fields such as wind power, electronic appliances, and aerospace. At present, under the guidance of relevant policies, adhesive products are gradually developing towards high performance and environmental protection, and the new application range of adhesives is more extensive.According to different molecular structures, adhesives can be divided into silicone adhesives, polyurethane adhesives, hot melt adhesives, epoxy resin adhesives, etc., among which, epoxy resin adhesives can bond between metal and most non-metallic materials, widely used in construction, automobiles, electronics, electrical appliances and daily household goods.For example, in the field of electronic and electrical packaging, epoxy resin potting adhesive has the characteristics of small shrinkage, good heat resistance and electrical insulation performance, good sealing, etc., can be used as a good packaging material, improve the convenience and success rate of packaging, but also improve the durability of the package. Therefore, epoxy resin potting adhesive is the most widely used adhesive products in the packaging field of electronic and electrical appliances.Epoxy resin itself is a linear structure of thermoplastic resin, the performance is very stable, only the addition of curing agent, so that it is crosslinked by the linear structure into a network or three-dimensional structure, in order to have excellent performance, and the performance of curing products largely depends on the curing agent, therefore, curing agent is an essential part of the use of epoxy resinThere are many kinds of epoxy resin curing agents, and suitable curing agents should be matched according to different use scenarios in order to play the best performance of the epoxy resin system.

Epoxy resin curing agent is mainly divided into apparent type and latent type two, apparent type curing agent is usually common use of curing agent, generally divided into amines, acid anhydrides, phenolic, alkyd resin, polymercaptan and so on These curing agents either participate in the three-dimensional network structure by opening the ring of the epoxy group for addition polymerization, or they do not participate in the network structure by cationic and cationic polymerization of the epoxy group. Latent curing agent means that after mixing with epoxy resin, It remains stable under certain conditions, but when it is exposed to special conditions (such as light, heat, moisture, etc.), a curing reaction begins.