Flashover Properties of Boron Nitride Oriented Composite Superhydrophobic Resin

Composite insulation materials are widely used in power equipment due to their excellent dielectric and mechanical properties. However, the composite insulation materials are susceptible to flashover along the surface under high humidity environments, and the heat generated by flashover cannot be dissipated in time, which will cause damage to the insulation materials. In this paper, we prepared a BN oriented composite resin with super-hydrophobicity and thermal conductivity based on the polymerization induced phase separation and BN orientation by 3D printing, which is expected to address the problems of insufficient water repellency, poor wear resistance and thermal conductivity of existing insulation materials. The surface morphology of the samples was observed. The thermal conductivity, hydrophobic performance, and flashover voltage of the samples were also measured. The results showed that the hydrophobic angle of the BN oriented composite superhydrophobic resin was 155°±1° and the slip angle was 7°±2°. The thermal conductivities of the pure resin and the BN oriented resin were 0.2 and 1.0 W/(m.K), respectively. The flashover voltage of the BN oriented resin was 18.78 kV under wet conditions, which was 115% higher compared with the pure resin.