Amphiphilic nano silicon dioxide filler for improving water resistance of water-based paint and preparation method of amphiphilic nano silicon dioxide filler

The invention belongs to the technical field of fillers, and relates to an amphiphilic nano silicon dioxide filler of a water-based coating and a preparation method of the amphiphilic nano silicon dioxide filler. The invention discloses an amphiphilic nano silicon dioxide filler for improving the water resistance of a water-based coating. The amphiphilic nano silicon dioxide filler is prepared from the following raw materials in parts by mass: 10 to 15 parts of nano silicon dioxide, 2 to 4 parts of 3-aminopropyltriethoxysilane, 3 to 5 parts of n-octyl triethoxysilane, 2 to 4 parts of an emulsifier, 3 to 5 parts of 52 # paraffin and 5 to 8 parts of an etching agent. According to the prepared amphiphilic nano-particles with spontaneous orientation, the interface characteristic of amphiphilic nano-particles is utilized, the problem that filler is difficult to disperse in water is solved, the nano-filler and water-based paint are mixed for construction, a blocking layer is spontaneously formed on a coating interf