聚(α-甲基苯乙烯/甲基丙烯酸丁酯)无皂乳液的合成与性能

摘要

A new soap -free poly (α -methyl styrene/butyl methacrylate) P(AMS/BMA) emulsion was prepared in the presence of the sodium salt of poly (butyl methacrylate/acrylic acid) P(BMA/AANa) oli-gomer 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 KC1 resolution of c (KC1) = 0 ~ 2. 5 mol/L with P (BMA/AANa) 37%, monomers 18. 5% ,m{ AMS): m(BMA) = 1. 0: 1. 5 , ( NH4)2S2O8 0. 3% , at 70-75 ℃ for 3 h. It was shown from results that the properties of emulsion were good.%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120 h无变化,涂膜剥落或起皱的时间为67 h,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.