Abstract: UV cured hybrid paint of nano-silica/acrylpimaric acid modified rosin was synthesized by mixing the two materials. The films were analyszed by FTIR, the mechanical properties and the heat resistances were also studied. The results showed that the addition of nano-silica extended the curing time and reduced the degree of crosslinkage and the degree of crosslinkage increased with the increasing dosage of photoinitiator and curing time at the same content of nano-silica. In addition, nano-silica particles could improve the mechanical properties, 10% content of the nano-silica made the pencile hardness reaching 4H and the adhesion reaching reaching the 1st grade. It also had some influence on the appearance of the hybrid, so it was better to keep the content of nano-silica less than 10% to keep the appearance and mechanical properties of the hybrid film. The thermal weight loss analysis showed that the addition of nano-silica had no visible influence on the heat resistance of the hybrid paint.

Key words: UV curing, nano-silica, acrylpimaric acid modified rosin