Self-cleaning nano-film coating and preparation method thereof

The invention discloses a self-cleaning nano-film coating and a preparation method thereof, and relates to the technical field of nano-coatings, the preparation method of the self-cleaning nano-film coating comprises the following steps: S1, uniformly mixing tetraethoxysilane, a modifier and absolute ethyl alcohol, adjusting the pH value, and reacting for 1-4 hours to obtain a nano-silicon dioxide dispersion liquid; s2, mixing water with the nano silicon dioxide dispersion liquid, and aging to obtain transparent silica sol; s3, mixing the transparent silica sol, the nano silicon dioxide, the nano titanium dioxide and hexamethyldisiloxane to obtain a mixed solution; s4, mixing the mixed solution with the dispersion solution to obtain a uniform solution; and S5, uniformly coating the surface of a cleaned substrate with the uniform solution, reacting at the temperature of 60-80 DEG C, and curing at the temperature of 110-170 DEG C to form the self-cleaning nano-film coating. The self-cleaning nano-film coating i