The excellent antifouling property of silicone resin also depends on its unique chemical structure. Silicone resin contains a large number of silicon hydroxyl groups. In the process of film formation, the silicon hydroxyl groups are dehydrated and condensed into a huge network structure, thus forming an extremely dense film. This is also the silicon resin paint film surface energy is low, surface tension is small reason. The modified silicone surface contact Angle can reach 150°, which can make the coating have excellent hydrophobicity, and theoretically has excellent antifouling property .
3.1 Polymer modified silicone resin
Unlike organic silicon antifouling paint, other polymer-based antifouling paint also has unique anti-fouling performance, therefore, with the aid of polysiloxane reaction active group and other polymer resin, polysiloxane resin can maintain the stability of the main chain structure and grafted other functional groups on the branch chain, to ensure that the fouling resistance effect and improve the defects of existing .
Xia Jie used polyurethane modified hydroxypropyl silicone oil to prepare modified silicone antifouling coatings. Through FT-IR analysis, the system contained NH stretching vibration peak and Si-O-Si stretching vibration peak, which proved that polyurethane modified silicone resin had been successfully prepared. By DSC analysis, the introduction of hydroxypropyl silicone oil increased the flexibility of the resin chain, so the glass transition temperature decreased. The results showed that when the amount of DY increased, the water absorption rate of the resin decreased, and the water resistance increased. Through the laboratory experiment of diatom adhesion, the amount of silicone resin modified by polyurethane is very small, which indicates that it has good antifouling ability.