Preparation and Study of Styrene-Acrylic Emulsions for One-Component Waterproofing Coatings
A series of styrene-acrylic emulsions were synthesized by semi-continuous drip process and one-component waterproofing coatings were prepared.The influence factors such as glass transition temperature,amounts of acrylamide(AM),acrylic acid(AA),silicone monomer and emulsifier types were studied.The results showed the improvement of Tg and amounts of acrylamide(AM),acrylic acid(AA)or silicone monomer leads to increase of the tensile strength and decrease of breaking elongation.Compared with anionic emulsifier DB 45,DS-4AP causes great increase of the water absorption rate of the paint film.When the optimized styrene-acrylic emulsion is prepared into one-component waterproofing coatings,the film has good performance.The tensile strength is 1.9 MPa,break elongation is 400%,water absorption is 8.5%after 7 days immersion,and the film can pass-20℃low temperature flexibility test.The film meets the technical requirements after acid and alkaline treatments according to JC/T 864-2008 Polymer emulsion architectural waterproof coating.
waterproofing coatingsstyrene-acrylic emulsiontensile strengthbreaking elongationlow temperature flexibility
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