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Modification of Plywood Surface with Epoxy Acrylate by Photo-curing

Different formulations were developed with prepolymer epoxy acrylate (EA-1020) and various reactive diluents to modify the plywood surface. Tripropylene glycol diacrylate; 1,6 hexanediol diacrylate; and trimethyl propen triacrylate (TMPTA) monomers were used as reactive diluents. Photoinitiator daracure-1664 (2%) was used in the formulations and two types of fillers such as talc and sand were also used in the basecoat formulations. The formulated solutions were coated on glass plate and cured under ultraviolet radiation. Pendulum hardness and gel content of the cured films were characterized. The formulation containing TMPTA showed the highest pendulum hardness. The same formulated solutions were coated on the polished plywood surface and cured under the same ultraviolet radiation with different radiation intensities (number of passes). Various physical parameters such as pendulum hardness, macro scratch hardness, micro gloss, adhesion, and abrasion test of coated plywood were studied. The formulation containing filler sand with TMPTA produced a better performance than those of other basecoat formulations, and the TMPTA-containing formulation produced the best performance of other top coat formulation. To further improve the surfaces of plywood, the surface was treated with aqueous acetic acid of different concentration and 3% acetic acid registered the improved properties.