Super-hydrophobic electrothermal epoxy resin composite material and preparation and self-repairing method therefor

A method of preparing superhydrophobic electrothermal epoxy composites, comprising:

• (1) mixing 100 parts of an epoxy resin, 42 to 84 parts of 1,4,5-oxadithiepane-2,7-dione and 0 to 43 parts of methylhexahydrophthalic anhydride, by weight, homogeneously at 50 to 70° C., and curing to obtain self-healable epoxy resins;
• (2) mixing 10 parts of the epoxy resin, 4.2 to 8.4 parts of 1,4,5-oxadithiepane-2,7-dione, and 0 to 4.3 parts of methylhexahydrophthalic anhydride, by weight, homogeneously at 50 to 70° C. to obtain a first prepolymer, adding 0.1 to 4 parts of a carbon nanotube by weight and a ester solvent to the first prepolymer and mixing homogeneously to to obtain a paste, coating the self-healable epoxy resins obtained in the step (1) with the paste, evaporating the ester solvent and curing to obtain electrothermal epoxy composites;
• (3) dispersing 4 parts of copper nanopowders and 0.1 to 2 parts of perfluorocarboxylic acid, by weight, in water, mixing homogeneously, filtering and drying to obtain modified superhydrophobic copper powders;
• (4) mixing at 50 to 70° C., 10 parts of epoxy resin, 4.2 to 8.4 parts of 1,4,5-oxadithiepane-2,7-dione and 0 to 4.3 parts of methylhexahydrophthalic anhydride, by weight, homogeneously to obtain a second prepolymer, dispersing the second prepolymer and the modified superhydrophobic copper powders sequentially on the electrothermal epoxy composites obtained in the step (2), and curing to obtain the superhydrophobic electrothermal epoxy composites.