A novel pollution flashover-resistance RTV rubber coating

Pollution flashover is the main factor that affects the safety of the transmission line and transformation equipment. Generally, anti-pollution flashover coating is considered to be one of the most effective means to prevent and reduce pollution flashover. Currently, the mostly used anti-pollution flashover coating is the room temperature vulcanized (RTV) silicone rubber. To solve the key technical problems of anti-pollution flashover coating, this work focus on improving the base gums, mechanical properties, thixotropic properties, fire resistance, flashover resistance and anti-weather capabilities of the RTV rubber coatings. The cross-linked network structure between silicone segment and nanometer silicon dioxide was formed through nano organic-inorganic hybrid modified technology, and the results show that the mechanical properties and thixotropic properties of the RTV rubber silicone coatings were significantly improved. A new process using one step synthesis method to produce hydrotalcite-like nanoparticles with layered structure was proposed, based on which a novel nano compound anti-pollution flashover coating was successfully developed, and the comprehensive performance of the samples was proved to meet the requirements of targets. The thermal stability of RTV rubber hybridized with the hydrotalcite-like nanoparticles α-FeOOH was greatly improved, and the anti-aging performance and service life of the samples were also improved by doping α-FeOOH nanoparticles with acicular structure. The main indexes of the products exceeded the existing RTV products, even higher than the PRTV products. The product not only filled the gap in the RTV coating field, but also reduced the cost of the product, so the product should have wider application prospect in the future.