Epoxy resins have excellent physical, mechanical, and electrical insulating properties, adhesion to various materials, and flexibility in their use processes that are not available in other thermosetting plastics. Therefore, it can be made into coatings, composite materials, casting materials, adhesives, molding materials and injection molding materials, and has been widely used in various fields of the national economy.
Due to many unique advantages such as high insulation performance, high structural strength and good sealing performance, epoxy resin has been widely used in the insulation and packaging of high and low voltage electrical appliances, motors and electronic components, it has developed rapidly. It is mainly used for: 1. Pouring of insulating packages for electrical appliances and motors. Such as electromagnets, contactor coils, transformers, dry-type transformers and other high and low voltage electrical appliances of the overall hermetic fully sealed insulated packaging manufacturing. It has developed rapidly in the electrical industry. It has developed to automatic pressure gel molding from atmospheric pressure pouring and vacuum casting.
1. Various forms. A variety of resin, curing agent, and modifier systems are available to suit the form requirements of virtually every application, ranging from very low viscosities to high melting point solids.
2.Easy to cure. By using various curing agents, the epoxy resin system can be cured in a temperature range of almost 0 to 180°C.
3.Strong adhesion. The presence of polar hydroxyl groups and ether bonds inherent in the epoxy resin molecular chain gives it high adhesion to various substances. Epoxy resin has low shrinkage when cured and produces little internal stress, which also helps improve adhesion strength.
4.Low shrinkage. The reaction between epoxy resin and the curing agent used is carried out through a direct addition reaction or a ring-opening polymerization reaction of the epoxy groups in the resin molecules, without the release of water or other volatile by-products. Compared with unsaturated polyester resin and phenolic resin, they show very low shrinkage (less than 2%) during the curing process.
5.Mechanical properties. The cured epoxy resin system has excellent mechanical properties.
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