Study on the Effect of SiO₂ Content on the Properties of Epoxy Resin

Abstract

With the development of energy layout in western China, the construction and operation of hydro-generator units in high-altitude and cold regions such as Tibet and Qinghai have increased rapidly, which puts forward stricter requirements for the insulation and anti-corona technology of high-altitude units. Improving the intrinsic properties of the matrix material is a highly efficient anti-corona method. In the paper, epoxy resin composites doped with different contents of micron silica were prepared. The effects of 0.5 wt%, 1 wt%, and 1.5 wt% SiO2 on the thermal conductivity, dielectric properties, and breakdown field strength of the matrix resin were researched. The results in this paper show that the doping of different contents of SiO2 has little effect on the thermal conductivity of the matrix resin, but improves the dielectric properties of the matrix resin to a certain extent. With the increase of SiO2 content, the breakdown field strength of the composites increased primarily and then decreased.