The styrene-acrylate emulsion was prepared by the way of semi-continuous core-shelled emulsion polymerization combined with pre-emulsification process, choosing reactive emulsifiers sodium dodecyl sulfate and alkylphenol ethoxylates as composite emulsifier, butyl acrylate, methyl methacrylate as soft and hard monomer respectively, methacrylic acid and SR444 as functional monomer, the potassium persulfate as initiator, NaHCO3 as buffers. The multilayered core-shell styrene-acrylic fluorine monomer modified emulsion were prepared when the reaction temperature were 70, 85, 65 ℃ respectively. The results showed that the styrene-acrylate emulsion had a good ability of stain resistance and ultraviolet resistance, and also had self-cleaning function when used as latex paint. High performance emulsion could be obtained when the mass ratios of nuclear shell, transition layer and shell were 3:4:4; the dosage of crosslinking agent SR444 was 2% of the total monomer; fluorine monomer was 3%. The three glass-transition temperatures could testify that the polymer had three layers of core-shell structure.%采用半连续核壳乳液聚合方法,并结合预乳化工艺,选用乳化剂十二烷基硫酸钠与烷基酚聚氧乙烯醚进行复配,以丙烯酸丁酯、甲基丙烯酸甲酯分别作为软硬单体,甲基丙烯酸、季戊四醇三丙烯酸酯SR444为功能性单体,过硫酸钾为引发剂,NaHCO3为缓冲剂,在反应温度分别为70,85,65 ℃时,制备了氟改性多层核壳结构丙烯酸乳液.核层、过渡层、壳层质量比为3:4:4时,交联单体SR444用量为单体总用量的2%,氟单体用量为单体总用量的3%时,可得到性能优良的乳液.所得聚合物有3个玻璃化转变温度,证实该聚合物有3层核壳结构.
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