Light-extinction heat-dissipating coating material and preparation method thereof

The present invention discloses a light-extinction heat-dissipating coating material, which comprises the following raw materials by weight: 1-2 parts of calcium linoleate soap, 1-2 parts of magnesium myristate soap, 12-15 parts of a styrene-maleic anhydride copolymer, 6-10 parts of propargyl alcohol, 90-100 parts of tetrahydrofuran, 4-7 parts of graphene, 16-20 parts of nanometer silica, 0.2-0.3 part of a silane coupling agent KH560, 700-800 parts of dimethylformamide, 4-5 parts of sodium nitride, 0.04-0.05 part of aluminum trichloride, 1.6-2 parts of a 2-3% sodium ascorbate solution, 1.8-2 parts of a 2-3% copper sulfate solution, 160-170 parts of high-density polyethylene, 0.7-2 parts of polyimide, 6-10 parts of diatomite, 0.8-1 part of castor oil polyoxyethylene ether, 3-4 parts of barium stearate, and 1-2 parts of chlorinated paraffin. According to the present invention, the diatomite, the polyimide, the calcium linoleate soap and the like are added, such that the mirror surface reflection effect of the paint film surface light can be reduced and the rough surface can be formed so as to achieve the light extinction effect.