Epoxy paint is a type of industrial paint that has developed extremely rapidly in recent years. Generally speaking, paints containing more epoxy groups in the composition are collectively referred to as epoxy paints. The main variety of epoxy paint is two-component paint, which is composed of epoxy resin and curing agent. There are also some one-component self-drying varieties, but their performance is far from that of two-component paint.
The main advantage of epoxy paint is that it has strong adhesion to inorganic materials such as cement and metal; the paint itself is very resistant to corrosion; it has excellent mechanical properties, wear resistance and impact resistance; it can be made into solvent-free or high-solid coatings; organic solvent resistance , heat resistance, water resistance; coating non-toxic.
Epoxy resin coating is mainly used for floor coating, automobile primer, metal anti-corrosion, chemical anti-corrosion, etc. It is suitable for painting the inner wall of oil tank, and can be widely used on the surface of various light metal and cement structures indoors and outdoors. Covering railway bridges, high-voltage transmission towers, containers, offshore drilling and oil production equipment, various vehicle chassis, heavy machinery, ships, chemicals, equipment and pipelines, and gas storage tanks used in different environments.
performance:
1. Excellent chemical resistance. The outstanding advantages of cured epoxy resins are very stable chemical properties, alkali resistance and oil resistance. This is because there is no ester bond in the epoxy resin, the contained aliphatic hydroxyl group does not react with the alkali, and the cured paint has a three-dimensional network structure. Therefore, epoxy resin coatings are often used as anti-corrosion primers, inner walls of oil tanks, etc.
2. Strong adhesion. Especially for polar substrates like metals (steel, aluminium), ceramics, glass, concrete, wood etc. The reason is that the epoxy resin contains highly polar ether groups and hydroxyl groups, which generate strong interaction forces with the substrate interface.
3. High strength and good toughness. When the strength is high, the epoxy resin contains an aromatic ring; the toughness is good because the epoxy resin contains an ether bond, which gives it the ability to carry out the internal rotation of the molecular chain, and is not easy to break.
4. Good electrical insulation. The cured epoxy resin exhibits excellent insulating properties, and its electrical properties are that the breakdown voltage at room temperature is 35~50kV/mm, and the volume resistance is 10Ω.cm.
5. Good heat resistance. Generally, it is 80~100℃, and some are up to 200℃ or even higher.
6. Small curing shrinkage. Dimensionally stable, not easy to crack. Usually 1% to 2%. Phenolic resin is 8%~10%, unsaturated polyester resin is 4%~6%, and silicone resin is 4%~8%.
