Acrylate emulsion for building exterior wall coating as well as preparation method and application of acrylate emulsion

The invention provides an acrylate emulsion for a building exterior wall coating as well as a preparation method and application of the acrylate emulsion. The emulsion is prepared from the following components as raw materials in parts by mass: a) 15-35 parts of a monovinyl aromatic monomer; b) 20-45 parts by mass of an alkyl (meth) acrylate; c) 0.5 to 5 parts by mass of C3-6 monocarboxylic acid and C3-6 dicarboxylic acid containing alpha, beta-monoolefinic unsaturated bonds; d) 0.5 to 5.0 parts by mass of a polymerizable benzophenone photoinitiator; and e) 1.0 to 5.0 parts by mass of a monomer having a hydrolyzable Si-organic bond. The invention also provides a preparation method of the emulsion. The emulsion is prepared by carrying out free radical emulsion polymerization on the components. The acrylate emulsion provided by the invention or the acrylic emulsion prepared by the method provided by the invention is used for building exterior wall elastic paint, and has excellent tensile ...