Synthesis of urethane acrylates modified by linseed oil and study on EBC coatings

In this paper, five different structural urethane acrylates modified by lin seed oil were synthesized and then properties of their electron beam cured (EBC) coatings, i.e., adhesion, gloss, flexibility, impact resistance, hard ness, tensile strength and elongation were studied. It was shown that these synthesizing conditions of urethane acrylates modified by linseed oil were temperate. Effect of structure of urethane acrylates modified by linseed o il on these properties of their EBC coatings was obvious, except gloss. Acc ording to synthetical properties of EBC coatings, the optimum oligomer amon g these was No. A, whose main chains were formed by hexane diacid, average functionality was 2, and oil content was 25.5%. With increasing of absorbed doses, these properties of EBC coatings, except gloss, changed correspondi ngly. It was advisable that absorbed dose wasn't greater than 180 kGy. At h igher absorbed doses, cobaltous naphthenate had obvious effect on these pro perties of EBC coatings, whose oil content of linseed oil was rather high. (C) 1999 Elsevier Science Ltd. All rights reserved.