Classification Of Uses Of Epoxy Powder Coatings

Curing agents can be divided into room temperature curing agents and heating curing agents according to their uses. Epoxy resins generally have excellent performance when cured at high temperatures, but coatings and adhesives used in civil engineering and construction require room temperature curing due to the difficulty of heating; therefore, most of them use fatty amines, alicyclic amines and polyamides, especially coatings and adhesives used in winter have to be used in combination with polyisocyanates, or use polyols with a foul odor.
As for medium temperature curing agents and high temperature curing agents, they should be selected based on the heat resistance of the body and the heat resistance, adhesion and chemical resistance of the cured product. The selection focus is on polyamines and acid anhydrides. Since acid anhydride cured products have excellent electrical properties, they are widely used in electronics and electrical appliances.
Aliphatic polyamine cured products have excellent adhesion, alkali resistance and water resistance. Aromatic polyamines are also excellent in chemical resistance. Since the nitrogen element of the amino group forms a hydrogen bond with the metal, it has an excellent anti-rust effect. The higher the mass concentration of the amine, the better the anti-rust effect. Acid anhydride curing agents form ester bonds with epoxy resins, show high resistance to organic and inorganic acids, and their electrical properties generally exceed those of polyamines.