Abstract
In order to improve the erosion resistance to electric discharge of epoxy resin insulator with high tracking resistance, the surface of silica filler was modified with three types of chemicals, i.e. methyl series silane, titanate, and epoxy series silane. The treated filler and the composite containing the filler were charac terized on its hydrophobic property, and the fluidity, the mechanical properties and the erosion resistance, respectively. It was found that the treatment with methyl series silane did not improve the erosion resistance. On the other hand, the modification with titanate and epoxy series silane resulted in remarkable improvement. The binding strength between the filler and resin was suggest d to be increased by molecular entanglement and/or covalent bond leading to the high erosion resistance.
