Styrene-acrylic emulsion for redispersible latex powder and preparation method thereof

The invention discloses a styrene-acrylic emulsion for redispersible latex powder and a preparation method thereof, the styrene-acrylic emulsion comprises the following raw materials by mass: 100 parts of a mixed monomer, 4-15 parts of a polyvinyl alcohol protective colloid, 0.2-0.5 part of an initiator, 0.1-0.3 part of an oxidant, 0.1-0.3 part of a reducing agent, and 80-130 parts of pure water; the mixed monomer is prepared from 35 to 65 percent by mass of styrene and the balance of butyl acrylate. By selecting brand new hydrophobic monomers, the water resistance and stability of the emulsion are improved, the problem that the development of dry-mixed mortar is seriously restricted due to poor water resistance and poor water-curing bonding strength of existing products in the market is solved, and the two selected monomers are high in boiling point, relatively simple in polymerization condition and capable of reacting under normal pressure; therefore, the styrene-acrylic emulsion disclosed by the invention