Abstract: Compared with micron grade acrylic resin, nano acrylic resin has better property and higher application value. It is crucial to study the preparation method of nano acrylic resin materials for its development. In this study, the emulsion polymerization was taken by using lauryl alcohol polyether AEO-7 and polyethylene glycol fatty acid ester PEG-400 as emulsifiers, methyl methacrylate, butyl acrylate, butyl methacrylate as monomers, potassium persulfate as initiators, in water phase, at 80 degree, to carry out polymerization. The results showed that, when employed water was 45 g and mass ratio of methyl methacrylate and butyl acrylate was 0.4:0.6（m:m）, the apparent character of emulsion was better, the particle size of the acrylic resin was the least about 80 nm, and also the stability of emulsion was better. If methyl methacrylate or butyl acrylate was replaced with butyl methacrylate in different mass ratio, the particle size of obtainede polyacrylic acid resin was above 130 nm in general. This work provides a reference for the preparation of nano acrylic resin.

Key words: nano, emulsion polymerization, acrylic resin, butyl methacrylate