基于油水相分离的多孔环氧树脂制备及闪络强度提升机理OA

Surface flashover is a critical bottleneck restricting the reliable operation of electrical equipment.Although porous structures have proven effective in enhancing flashover strength,existing construction methods are difficult to ap-ply to traditional insulating materials like epoxy resin.We successfully prepared porous epoxy resin insulation materials through thermal curing combined with an oil-water phase separation method.Porous structure in epoxy resin is con-structed by the suspended water droplets.By adjusting the water phase content(5％～40％),we regulated the porous morphology of the epoxy matrix and analyzed the influence of pores on material hydrophobicity and flashover strength.Through potential decay analysis,potential scanning,and discharge path observation,the mechanism of porous structure in enhancing flashover strength is revealed.The results indicate that,when the pore-forming agent(water)content reaches 10％～20％,the flashover strength improvement is optimal,showing a maximum enhancement of 24.8％compared to non-porous materials.The enhancement can be attributed to the combined effects of pore-induced surface charge dissipa-tion and corona stabilization.