Preparation And Anti-Icing Performances Of Semiconductor&Super-hydrophobic Compound Coating For Insulators

At present, the most popular anti-ice coating on transmission line includeshydrophobic coating and the thermal coating. Due to the contact angle less than120°,the common hydrophobic coating used for transmission line has no obvious anti-iceperformance. The contact angle of super-hydrophobic coating can reach155°, andshows very good anti-ice performance under glaze situation, but this kind of coating cannot prevent the ice formed on the transmission line or insulators completely because ofthere surface hierarchical structures and chemical composition. Although electrothermalcoating can enhance the temperature of insulator, the hydrophobicity of ordinaryelectrothermal coating is not so strong, and accumulates contaminants very easily, thusoften leads to rain flashover.In view of above situation, this paper combined the electric heating effect ofsemiconductor electrothermal coating together with the super hydrophobicity and lowsurface energy of the super-hydrophobic coating, and prepared a new kind ofsemiconductor&super-hydrophobic compound coating for insulators. The insulationproperties and electric heating effect of the semiconductor substrate, the hydrophobicityand ice adhesion strength of the outer super-hydrophobic coating were measured andanalyzed. At last, the anti-ice performance of the semiconductor&super-hydrophobiccompound coating was tested in the artificial climate chamber. The work focuses mainlyon the following contents:①The preparation schematic of the semiconductor&super-hydrophobiccompound coating was designed in the paper. Firstly, the conductive fillers graphite andnano carbon black were added into the substrate of super-hydrophobic coating, and thesemiconductor substrate coating was prepared. Then the super-hydrophobic coating wasprepared through the nano-silica self-assembling on the semiconductor substrates. Atlast, we got the semiconductor&super-hydrophobic compound coating.②The content of conductive fillers were confirmed through experiments. And thehydrophobicity, dispersion of conductive particles, insulation properties, leakage currentand electric heating effect of the semiconductor substrate coating were tested andanalyzed. The surface microstructure, hydrophobicity and ice adhesion strength weretested by contrast experiment when the substrate of super-hydrophobic coating hasconductive fillers and no conducting fillers. Small amount of conductive fillers in the substrate was proved would not affect the basic properties of the super-hydrophobiccoating.③At last, the anti-ice performance of the semiconductor&super-hydrophobiccompound coating was tested in the artificial climate chamber. Under charged condition,the ice accumulation appearance, ice branch length and the ice flashover voltage of thesemiconductor&super-hydrophobic coating were measured. The results showed thatthis kind of compound coating showed excellent anti-ice ability.The above researches show that the semiconductor&super-hydrophobic coatinghas good electrothermal effect, super hydrophobicity and tiny ice adhesion strength, thiscoating has the anti-ice ability the transmission lines, and its anti-ice performance wasexperimental proved in the artificial climate chamber.