The invention discloses a modified silica
sol and application thereof in preparation of aqueous painting. The inventive modified silica
sol is prepared from aqueous silica
sol by regulate pH value of
raw material to 3-6; charging organosilane with a
mass ratio with SiO2 in silica sol of 1:1 - 5:1, water
bathing at temperature of 50-80 DEG C., waiting for 0.5-5 hours, vaporizing by-products generated in
hydrolysis to obtain transparent sol, which is final product. The modified silica sol has cheap
raw material, simple preparation. When used as matrix in preparation of paint, the sol uses only water as
solvent, without need of adding any
organism such as
alcohol. The preparation is simple, economic, environmental protecting. The prepared aqueous paint not only has high decorative, great adhesion and
toughness of organic paint, but also has high rigidity,
chemical resistance of inorganic paint, which can be used on surface of substrates of
metal, glass, wood, plastic and in
construction industry.