Three different types of silicone acrylic emulsion(silicone acrylic emulsion 1,silicone acrylic emulsion 2,silicone acrylic emulsion 3)are mixed with styrene acrylic emulsion respectively at a mass ratio of 1∶9,and then mixed with cement and other powders at a mass ratio of 1∶1.5 to prepare JS waterproofing coating and to study its performance.The results show that compared with the JS waterproofing coating made of styrene acrylic emulsion,the JS coating made of silicone acrylic emulsion 1/styrene acrylic emulsion has the highest tensile strength and adhesive strength,the lowest water absorption,but the elongation at break will be reduced.After optimizing the mixing ratio,it is found that when the addition amount of silicone acrylic emulsion 1 is 7.5％,the tensile strength,adhesive strength,elongation at break and water absorption in 7 days of the JS waterproofing coating prepared are 121％,125％,105％and 84％respectively of the JS waterproofing coating prepared by styrene acrylic emulsion,and meet the requirements of GB/T 23445-2009 standard.
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