The invention discloses a preparation method of a
silicon dioxide
aerogel water-based heat isolation
coating. The preparation method comprises the following steps of S1, dripping one part of tetraethoxysilane into a
mixed solution of 10 parts of ethyl
alcohol and 2 to 10 parts of pure water, adding 2 to 5 parts of
hydrogen peroxide solution, and then dropwise adding 2 to 5 parts of
titanium tetrachloride, so as to prepare a micro-
sol solution; S2, adding the micro-
sol solution into a spraying chamber with
ammonia gas by a spraying method, so as to obtain nanometer gel microspheres; S3, standing and aging; S4, performing CO2 (
carbon dioxide)
supercritical drying, so as to obtain aero-gel
powder; S5, vibrating and screening 100 parts of dry gel
powder C into 10 to 100 parts of water-based
coating, adding 3 to 8 parts of surfactant, 3 to 8 parts of filming additive and 3 to 8 parts of defoaming agent, and stirring for 2h, so as to obtain the finished product, namely the
coating. The prepared
aerogel powder has the advantages that the particle size is uniform, the internal
porosity is high, the dispersivity in the coating is good, and the like; the filming property and stability are good, the falling is avoided, the heat isolation property and the quality of the finished product are better, and the
aerogel powder is suitable for being widely popularized.