Resins containing two or more epoxy groups are epoxy resins. The epoxy group consists of an oxygen atom and two carbon atoms to form a ring, which is highly active, so the epoxy resin can cross-link with various types of curing agents to form a three-dimensional network structure polymer. Epoxy resin coatings (code H) with epoxy occupy an important position in coating products because of their excellent properties such as strong adhesion and good chemical corrosion resistance.
Epoxy paint can be divided into three categories according to the drying method:
(1) Two-component room temperature drying coating (epoxy reaction)
These include polyamine (aliphatic amine, alicyclic amine, aromatic amine) cured epoxy resin paint, polyamide resin cured epoxy resin paint, amine adduct cured epoxy resin paint, amine cured epoxy asphalt paint, amine Curing solvent-free epoxy lacquers and polyisocyanate-curing epoxy varnishes (hydroxyl reactive).
(2) One-component drying coating
These include: epoxy phenolic resin paint (hydroxyl reaction); epoxy amino resin baking varnish (hydroxyl reaction ); epoxy "blocked polyisocyanate coating (hydroxyl reaction); epoxy amino alkyd baking varnish (hydroxyl reaction); Powder coating (epoxy-based reaction), including epoxy "dicyandiamide coating, epoxy" replacing dicyandiamide coating; epoxy "acid polyester (Hybrid, hybrid) coating; TGIC acid polyester powder coating; others Epoxy resin paint, including linear epoxy resin paint (volatile type), radiation curing cycloaliphatic epoxy resin paint, waterborne epoxy resin paint.
(3) Fatty acid esterified paint (normal temperature drying and drying)
These include epoxy ester paint (drying and drying at room temperature), epoxy ester! Synthetic resin and paint, styrene modified epoxy paint.
The outstanding performance of epoxy resin paint is strong adhesion, especially stronger adhesion to metal surfaces, and good chemical corrosion resistance. It has good paint film color retention, stability and electrical insulation. However, bisphenol " epoxy resin has poor outdoor UV resistance, the paint film is easy to powder, lose gloss, and the fullness of the paint film is not good. It is not suitable for high-quality outdoor topcoats and high-grade decorative paints. Aliphatic epoxy resins It can be used outdoors. Epoxy resin paint is a good anti-corrosion coating, widely used in chemical industry, shipbuilding, aircraft, vehicles, electrical equipment and other industrial fields, for coating of mechanical equipment, containers and pipelines. Environmental protection developed in recent years Non-toxic coatings, such as water-soluble epoxy electrophoretic paint, room temperature curing water-diluted epoxy resin coatings, water-based epoxy ester coatings , solvent-free epoxy resin coatings and powder epoxy resin coatings, have further expanded the application fields of epoxy resins.
