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Three Hardness Test Methods and Their Relationship on UV-Curable Epoxy Acrylate Coatings for Wooden Flooring Systems
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2006
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UV-curable epoxy coatings consist of oligomers, monomers, and a photoinitiator with no additives. The oligomer and photoinitiator used in this study were diacrylate ester of bisphenol A epoxy resin and dimethylhydroxyacetophenone. The monomers used were 2-hydroxypropyl acrylate (HPA), 1,6-hexanediol diacrylate (HDDA), and trimethylol propane triacrylate (TMPTA). To investigate the performance of UVcurable epoxy acrylate coatings at various trifunctional acrylate monomer ratios for application to wooden flooring systems, we investigated the hardness using three methods: pencil hardness, pendulum hardnesss, and microhardness; in addition we investigated their relationship and the effect of the substrate.