Synthesis and Characterization of Waterborne Epoxy Resins for Coating Application

Mixtures of polyethylene glycol 4000 (PEG) and bisphenol A (BPA) with different ratios (1:1, 2:1, and 1:2) were reacted with epichlorohydrin (ECH) to give diglycidylether epoxy copolymers (DGECBAPEG). Diglycidylether of polyethylene glycol (DGEPEG) and diglycidylether of bisphenol A (DGEBA) epoxy resins were also synthesized for comparison. The prepared epoxy resins were characterized by FTIR and measuring the hydroxyl value and epoxy group content. Epilink 701 waterborne curing agent is used for hardening the water soluble (water based) epoxy resins, where Epikure 3115-x-70 polyamide curing agent is used for hardening the water insoluble (solvent based) epoxy resins. The curing process of the epoxy resins were applied and evaluated as coating materials. The prepared waterborne epoxy resins give good metal coating properties