Gemini silicon-containing surfactant as well as preparation method and application thereof

The invention discloses a Gemini silicon-containing surfactant, the general molecular formula of the surfactant is shown in the specification, m is an integer from 10 to 30, n is an integer from 0 to 20, and m is greater than or equal to n; r1 is alkyl of 1 to 12; r2 is one of ethyl, vinyl or phenyl; r3 is methyl or ethyl; and R4 is a group except isocyanato in diisocyanate. The Gemini silicon-containing surfactant provided by the invention is a reactive Gemini surfactant, not only can be subjected to a grafting reaction with inorganic particles such as titanium dioxide, carbon black, filler calcium carbonate and the like through a hydrolysis reaction of silane so as to obtain a stable dispersion liquid system, but also is of a double-hydrophilic and double-hydrophobic-chain structure, so that the stability of the Gemini silicon-containing surfactant is improved, and the service life of the Gemini silicon-containing surfactant is prolonged. The inorganic particles can be wetted better and faster, the surface