Styrene-acrylic emulsion (styrene - acrylic emulsion) is styrene and acrylic ester monomer derived by emulsion copolymerization. Monomer in the water by the emulsifier dispersed into the emulsion state of polymerization, called emulsion polymerization. Conventional emulsion polymerization system consists of monomer, water, water-soluble initiator, water-soluble emulsifier composed of four parts, the application of the formula will be much more complex. Emulsion polymerization is often copolymerization, in addition to the main monomer, there may be second and third monomer. Styrene-acrylic latex water resistance, alkali resistance, good rub performance, and resistance to outdoor aging is widely used in adhesives, coatings and other fields.