Investigation the Effcet of Nano Alumina on Scratch Resistance of UV Curable Urethane Acrylate

Curing of relatively thin polymers via radiation in various applications such as varnishes, paints and printing inks has recently developed. Urethane acrylate resins are among the most important radiation curable resins which can be used in different industries such as automotive industry. Since scratch resistance is very important in lots of these applications, improvement of scratch resistance of mentioned coatings via incorporation of nano particles attracts a lot of interest. This study is dedicated to investigation of the effect of nano alumina particles on physical and mechanical properties of UV curable urethane acrylate, especially scratch resistance. Scratch resistance of different coatings was evaluated by nano indentation microhardness and adhesion strength of coatings have also investigated. The results depicted that the scratch work increases from 470 to 700 pJ and the elastic modulus from 1.9 to 2.3 GPa. In general, results showed improvement of urethane acrylate coating properties via addition of nano alumina.