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目的：高弹性外墙乳胶漆的耐洗刷性能。方法分别使用有机硅A-171、AAEM（乙酰乙酸基甲基丙烯酸乙酯）、GMA（甲基丙烯酸缩水甘油酯）、TMPTMA（三羟甲基丙烷三甲基丙烯酸酯）等功能单体并选择加入方式对丙烯酸乳液进行改性，对所得的一系列乳液样品配制乳胶漆，进行涂层耐洗刷性等应用性能的测试。结果随着有机硅A-171单体用量的提高，乳液成膜性能变差，且涂层耐洗刷性保持在820~830次。当AAEM质量分数大于0.5%时，涂层耐洗刷性大于1000次；当AAEM质量分数超过1.5%且2.5 h后加入时，乳液放置后黏度会增大1000 mPa·s以上；AAEM的用量为1.0%且2.5 h后加入时，乳液黏度为1600 mPa·s，涂层耐洗刷性为1700次。当GMA用量大于1.0%时，涂层耐洗刷性大于900次；当GMA用量超过1.5%且2.5 h后加入时，乳液平均凝胶率超过0.10%；当GMA单体用量为1.0%且2.5 h后加入时，平均凝胶率为0.06%，涂层耐洗刷性为920次。当TMPTMA单体用量为1.5%以上时，其耐洗刷性保持在1000次以上。结论加入有机硅A-171单体，涂层的耐洗刷性没有得到提高；分别引入 AAEM、GMA 功能单体，涂层耐洗刷性均得到增强，且后加入方式比初始加入方式有利；引入TMPTMA单体，涂层耐洗刷性得到提高。使用AAEM功能单体后的乳液样品，其涂层耐洗刷性、乳液黏度及储存放置后黏度等综合性能最好。

ABSTRACT:Objective To improve the scrubbing resistance of elastic exterior wall latex paint.MethodsIn this paper, acrylic emulsion was modified with organic silicon monomer A-171, AAEM (Acetoacetoxy ethylmethacrylate), GMA( Gly-cidyl methacrylate) and TMPTMA (Trimethylol propane trimethacrylate) using different adding methods respectively, and a series of samples were formulated as exterior wall latex paint. Scrubbing resistance and other properties were tested to evaluate the emulsion and latex paint.Results The film forming properties were reduced and the scrubbing resistance cycle number was kept in range of 820~830 with increasing amount of A-171 monomer. When AAEM addition was greater than 0.5%, the scrubbing resistance cycle number was higher than 1000; when AAEM addition was greater than 1.5% and added after 2.5 h, the increment of apparent viscosity of acrylic emulsion during standing process was greater than 1000mPa·s; the apparent viscosity of acrylic emulsion was 1600mPa·s and the scrubbing resistance times was 1700 when AAEM addition was 1.0% and added after 2.5 h. When GMA addition was greater than 1.0%, the scrubbing resistance cycle number was higher than 900; when GMA addition was greater than 1.5% and added after 2.5 h, the average gel content of acrylic emulsion was greater than 0.10%; when GMA addition was 1.0% and added after 2.5 h, the average gel content of acrylic emulsion was 0.06% and the scrubbing resistance cycle number of the coating was 920. The scrubbing resistance cycle number of the coating was higher than 1000 when TMPTMA addition was greater than 1.5%. Conclusion The addition of A-171 was not helpful for scrubbing resistance. The cycle number of scrubbing resistance became higher with addition of AAEM and GMA respectively and addi-tion at later stage was better than addition at the beginning. The addition of TMPTMA could improve the scrubbing resistance. The acrylic emulsion with AAEM exhibited the best comprehensive properties in coating scrubbing resistance, apparent vis-cosity of acrylic emulsion and the increment of apparent viscosity during standing process.