Epoxy resin is a general term for a class of polymers that contain ether bond and secondary alcohol bond in the main chain of the macromolecule, and contain epoxy groups at both ends.
There are many types of epoxy resins, which can be divided into bisphenol A type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, phenolic epoxy resin, unsaturated epoxy resin, etc. Among them, bisphenol A type epoxy resin has large output and wide application. It has excellent adhesion, electrical insulation, heat resistance and chemical stability, low shrinkage, low water absorption and good mechanical strength. The main use of epoxy resin is as a coating, followed by electrical insulation materials, reinforcement materials and adhesives. There are many other types of epoxy resins, and they have unique properties, such as low viscosity and good heat resistance, which can be used for long-term use at temperatures above 200 degrees Celsius, high mechanical strength, large elongation, heat resistance and radiation resistance. These It was developed for special purposes.
Bisphenol A epoxy resin has three kinds of low molecular weight, medium molecular weight and high molecular weight. Low molecular weight epoxy resins are mostly used in the plastics industry, and can be formed by casting, molding, laminating, and foaming. High-molecular-weight epoxy resin is used in the coating industry, mainly used as a protective layer for ships and steel structures that target metals. It can also be used as a paint adjuster for cationic electrophoretic coatings. Both performance and alkali resistance are better than phenolic resin coating and polyester coating.
Epoxy resins are widely used in the bonding of various materials such as building materials, aircraft and missile parts, and electronic and electrical parts. Epoxy resins can also be used as textile finishing agents, building insulation materials and decorative materials, etc. It is also widely used in cutting-edge technology and military fields.