以苯乙烯、甲基丙烯酸甲酯和丙烯酸为共聚单体 ,在氯化钠存在下 ,以过硫酸铵为引发剂 ,采用分批加料方式 ,用无皂乳液聚合法制备了单分散、大粒径的聚合物乳液。结果表明 ,随着氯化钠用量的增加 ,乳液粒径增大 ,但当其用量大于 1g时 ,乳液变得不稳定 ,粒径分布变宽 Styrene, methyl methacrylate and acrylic acid as comonomers, in the presence of sodium chloride, ammonium persulfate as initiator, the use of batch feeding mode with soap-free emulsion polymerization prepared monodisperse, large particles Diameter polymer emulsion. The results showed that with the increase of sodium chloride dosage, the emulsion particle size increased, but when the dosage was more than 1g, the emulsion became unstable and the particle size distribution became wider