ABSTRACT
94The possibility of preparing epoxy–urethane coatings based on epoxy–isocyanate mixtures using epoxy resin, hydroxyl-acrylic oligomer, hardener, and isocyanate has been considered. Stepwise method of epoxy–urethane films formation has been developed. The effect of mixture composition, temperature, and cross-linking time on film hardness and gel-fraction content has been established. The mixtures with optimal hardness and gel-fraction content were analyzed by IR spectroscopy regarding functional groups content during cross-linking at different temperatures. The reaction scheme of three-dimensional cross-linked structure formation has been suggested.
