BATF-66 is a styrene/acrylate copolymer for interior and exterior wall penetration primers. The latex adopts molecular weight control technology, which shows excellent substrate permeability during the film-forming process; The emulsion penetrates into the putty, and its surface functional groups are crosslinked to form a dense layer during the film-forming process, so as to achieve the effect of reinforcement and sealing, and can have excellent reinforcement and resistance to pan-salinity. BATF-66 synthetic emulsion BATF-66 is a zero-added film-forming additive and permeable primer emulsion, which gives the finished paint the performance advantage of easy construction; At the same time, the electric double layer protection technology is adopted in the design process of emulsion particles, so that BATF-66 can have excellent freeze-thaw stability by adding a very small amount of antifreeze when preparing paint samples.