Epoxy Coating

Epoxy resin is a kind of polymer formulated by Bisphenol A and Epichlorohydrin. It is widely used as an adhesive, a dental material, an injection material for plastic, a construction material, as electrical insulation, and so on. The coating based on epoxy has excellent properties in adhesive, chemical (especially alkali) resistant, abrasion resistant, and insulator. Therefore, it is widely used by food manufacturers, GMP, electric-related manufacturers, hospitals, and other operations where good sanitary and hygienic conditions are extremely important.

Epoxy can be divided into water-based and solvent-based types. The water-based type is widely used on the interior walls and the floors in electrical manufacturers, food manufacturers, and GMP factories. The solvent-based type can be further divided into solvent and solventless types.

There are three kinds of epoxy resins: esterification, thermal curing, room temperature curing. The room temperature curing epoxy resin is better in application, workability, and quality, and is therefore more frequently used. This type dries aided by the proper mixture of epoxy as the base agent and polyamide or polyamine as the curing agent. After application, the cross-linking reaction under normal temperatures will dry the mixture. The ratio of the mixed components must follow the manufacturer’s instructions. The mixed paint can be used at once but is limited by its pot life. The painting tools must be cleaned thoroughly after use.

The physical and chemical property of epoxy paint is better than PU paint. However, epoxy paint cannot resist UV rays, which will cause discoloring and chalking of the film. Therefore, most exterior construction will use PU paint as the topcoat.