Study On Tung Oil Alkyd Resin Waterborne Insulation Paint Modified By Silicon Resin

In order to meet environmental requirements and take advantage of china tung oil source, tung oil alkyd resin waterborne insulation paint modified by silicon resin was prepared. The parameters of the reaction was optimized, and the structure and properties of relative products were characterized and tested by FTIR, DSC, TG and withstand voltage tester.Under catalysis, silicon resin was prepared from tetraethoxysilane(TEOS) and methyl triethoxysilane(MTES) in by sol-gel method. Large amounts of hydrophobic groups Si-CH3 were structured on the main chain Si-O-Si of the silicone resin.The best synthesis conditions from optimized experimental were as following: mole ratio of TEOS, MTES, C2H5OH and H2O is 3:4:3:24, reaction temperature and time are 60℃and 4h respectively, catalyst is HCl, whose pH is ranged from 3 to 4. When the above silicone resin was cured, the film has excellent adhesin, hardness and water resistance. With the increase of MTES content, the contact angle is increasing and reaches about 138°for nMTES/nTEOS >5.Tung oil alkyd resin was prepared from tung oil, maleic anhydride (MA) and trimethylolpropane(TMP) by esterification and Diels-Alder addition reaction.Then, the waterborne insulation paint was prepared from tung oil alkyd resin modified by silicon resin. When acid value of system is 55mgKOH/g, content of silicone resin is 7.5wt%, the solid content of waterborne insulation paint is 55% while kinematic viscosity is wthin 300mm2 ?s-1. The heat resistance of the waterborne insulation paint film is excellent, electrical strength reaches 130MV·m-1, contact angle is above 120°and hardness reaches 5H.