摘要： 以聚（甲基丙烯酸丁酯／丙烯酸钠）［P（BMA／AANa）］低聚物为乳化剂，合成了无皂聚（α－甲基苯乙烯／甲基丙烯酸丁酯）P（AMS／BMA）乳液，考察了 P（BMA／AANa）用量、AMS和 BMA配比对无皂乳液电解质稳定性、冻融稳定性和高温稳定性以及成膜耐水性的影响。当 P（BMA／AANa）37%（质量分数，下同），AMS和 BMA总量 18.5%，m（AMS）∶m（BMA）＝1.0∶1.5，（NH₄）₂S₂O₈ 0.3%，反应温度 70~75℃，反应时间 3h时，合成乳液冻融指数为 5，60℃下保温 120h无变化，涂膜剥落或起皱的时间为 67h，w［P（AMS／BMA）］＝0.1%的乳液加入 c（KCl）＝0~2.5 mol/L的氯化钾水溶液中，透光度为 41%~42%，表明乳液具有较好的性能。

关键词: 无皂乳液, α－甲基苯乙烯, 甲基丙烯酸丁酯, 合成, 性能

Abstract: A new soap-free poly(a-methyl styrene/butyl methacrylate)P(AMS/BMA) emuision was prepared in the presence of the sodium salt of poly(butyl methacrylate/acrylic acid)P(BMA/AANa) oligomer as emulsifier. The influences of the amount of P(BMA/AANA), mass ratio of the monomers on electrolyte stability, freeze-thaw stability and high temperature stability and water resistance of the soap-free emulsion were studied. The emulsion showed an optimum properties of freeze-thaw index 5, without change at 60 ℃ for 120 h, wrinkling or peeling off time of coating films 67 h and transmittance reached 41%-42% by adding the emulsion of w P(AMS/BMA)=0. 1% to KCl resolution of c(KCl)=0-2. 5 mol/L with P( BMA/AANA)37%,monomers 18.5%,m(AMS):m(BMA)=1.0:1.5,(NH₄)₂S₂O₃ 0.3%,at70-75°C for 3 h. It was shown from results that the properties of emulsion were good.    

Key words: soap-free emulsion, a-methyl styrene, butyl methacrylate synthesis, property