The excellent physical, mechanical and electrical insulation properties of epoxy resin, its bonding properties with various materials, and its flexibility of use process 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 is widely used in various fields of the national economy.
In addition to poor adhesion to non-polar plastics such as polyolefins, epoxy resins are also suitable for various metal materials such as aluminum, iron, copper; non-metallic materials such as glass, wood, concrete, etc.; and thermosetting plastics such as phenolic, amino , unsaturated polyester, etc. have excellent bonding properties, so it is called the universal glue. Epoxy adhesives are an important variety of structural adhesives.
Coating use
The application of epoxy resin in coatings accounts for a large proportion, and it can be made into varieties with different characteristics and uses. Its commonality:
1. Excellent chemical resistance, especially alkali resistance.
2. The paint film has strong adhesion, especially to metals.
3. Has good heat resistance and electrical insulation.
4. The paint film has good color retention.
However, the bisphenol A epoxy resin coating has poor weather resistance, and the paint film is easy to powder and lose its luster in the outdoors, so it is not suitable for outdoor coatings and high decorative coatings. Therefore, epoxy resin coatings are mainly used as anticorrosion paints, metal primers, and insulating paints, but coatings made of heterocyclic and alicyclic epoxy resins can be used outdoors.