Abstract

Powder coatings are the fastest growing variety of coatings due to their high compliance with the standards of 5E. Particularly, epoxy powder coatings with bisphenol A diglycidyl ether (BADGE) as the resin matrix are widely used in building materials, ship pipelines, electronic devices and automotive furniture decoration materials, attributed to their excellent mechanical properties, corrosion resistance, electrical insulation and good appearance. The properties of the cured products of epoxy powder coatings are dominated by the curing systems. This review discusses the types, reaction principles, characteristics of curing agents and accelerators that participate in the curing reaction with different epoxy resins. Particularly, curing agents (amines, anhydrides, phenols, polyester resins, acrylic resin, polycarboxylic acid and its derivatives), curing accelerators (tertiary amines, imidazole and its derivatives, substituted urea, metal coordination compound and Lewis acid) and reaction mechanisms in curing systems based on BADGE for epoxy powder coatings are compared. Different from the previous reviews of powder coatings focusing on the formulation optimization and performance improvement, this review interprets curing reactions of epoxy powder coatings from the perspectives of chemical mechanism and selection strategy.

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