In this study, we synthesized one epoxide group at one end and one vinyl bond at the other end through the reaction of DGEBA and AA, obtaining dual-curable epoxyacrylate (EA). Structure of EA was characterized by NMR and FTIR. Their epoxy conversion rate was 51.8 and 53.0%, respectively. Subsequently, graphene oxide (GO) was prepared by Hummers’ method and characterized by SEM, FTIR, Raman and TAG. Finally, the EA resin was added with the GO at different compositions in addition to the reactive diluent and curing agents. After UV- and thermo-cure, the EA/GO composites were then subjected to the tests of hardness, adhesion and anti-corrosion.
The results showed that the addition of GO into the EA could increase the hydrophobicity of the coating and the hardness of the coating could reach 6H for the EA/GO film at 3 phr GO. In addition, the coating of EA/GO on the cold roll steel could protect the metal from corrosion where the corrosion potential increased and the corrosion current decreased with the GO content.
We hope to modify GO to produce chemical bonding with epoxy acrylate resin. Alternatively, the GO is reduced to GP, expected to form a good physical barrier to retard moisture or corrosive media penetration, reaching corrosion resistance.