Abstract: The deposition and infiltration of organic pollutants on the surface of methyl silica superhydrophobic coatings will lead to a decrease in the self-cleaning properties of the coatings, which in turn will lead to a decrease in the insulation strength of the coatings under dirty and wet environmental conditions. There is a lack of research on the effect of organic fouling on the insulation strength of methyl silica superhydrophobic coatings. The insulation strength of the coating samples under dirty and wet conditions is reflected by measuring the leakage current amplitude of the coating samples after they are wetted with alkane organic substances in different degrees and ways. The results show that the leakage current amplitude of the surface of methyl silica superhydrophobic coating increases by more than 50% when the infiltration area of organic pollution is increased to 3 times under the experimental conditions. The leakage current amplitude of the coating is decreased by about 16% by increasing the dispersion degree of organic pollution sites. Under the experimental conditions of heavy organic infiltration, the static contact angle and rolling angle of methyl silica super-hydrophobic coating drops are decreased by 10° and increased by more than 7° respectively.

Key words: organic pollutant, methyl silica superhydrophobic coating, anti-flashover, self-cleaning