Formulation Optimization Method of Local Insulating Spray Materials Based on Rapid Curing

Abstract With the increasing incidence of bird damage affecting the reliability of transmission lines, addressing bird pest control has become an important task for the operation and maintenance of transmission lines. A viable solution involves the application of spray coating polyurea elastomer composite materials to insulate exposed conductive points and weakly insulated connection parts of transmission line towers. To improve the comprehensive performance of polyurea elastomers, in this study, the curing system of polyurea elastomers was modified by incorporating Al2O3, SiO2, and BN nanoparticles. An orthogonal experiment was designed to study the influence of different fillers on the comprehensive performance of polyurea elastomers. These nanoparticles partially filled the defects inherent in the polyurea elastomers and microparticles, improving the Alternating Current (AC) breakdown strength of the polyurea elastomer. Compared with filler-free polyurea elastomers, optimal performance of the polyurea elastomer was achieved when using 5 wt% Al2O3, 0.4 wt% SiO 2 , and 5 wt% BN, resulting in a 15.75% increase in the AC breakdown strength and a 10.00% enhancement in the thermal conductivity.