Preparation and application of photocurable polyurethane flexible coatings
UV-curable coatings are environmentally friendly coatings with the advantages of rapid curing and film formation.Herein,we reported an UV-curable polyurethane oligomer based on soft segment of polycarbon-ate diol and carbon-carbon double bond as end group.The photocurable flexible polyurethane was prepared by combining the oligomer with several active acrylate monomers,and the properties of the coatings after curing with different formulations were studied.The results showed that addition of an additional 15wt％polyethylene glycol(400)diacrylate to a coating containing 55wt％polyurethane prepolymer resulted in a film with good flexibility and adhesion,and good performance.After the aging test,it could still maintain good adhesion force with the polycarbonate substrate.
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