The styrene-acrylic emulsion emulsion polymerization system mainly consists of monomers, water, water-soluble initiators, and water-soluble emulsifiers. The monomers are dispersed in the emulsion by the emulsifier in water. The formulations used in industry are much more complicated. Emulsion polymerization is often a copolymerization. In addition to the main monomer, there may be second and third monomers. Water as medium, cheap and safe. Latex viscosity is low, which is conducive to heat transfer, transportation and continuous production; high polymerization rate, high molecular weight of a product, polymerization can be carried out at a lower temperature; is conducive to the direct use of latex and the production of environmentally friendly products, such as water emulsion Paints, adhesives, paper, leather, fabric disposal agents, etc.