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采用氧化还原引发体系,丙烯酰胺与丙烯酸钠共聚后,经Mannich改性,在反相乳液中制备了两性聚丙烯酰胺.对其反应条件及乳液稳定性进行了研究,结果表明,当合成阴离子度为5%,采用丙烯酰胺:甲醛:二甲胺(mol)＝ 1:1:1.2,反应温度为45 ℃,反应时间为4 h和pH＝5.0的条件下,可获得分子量及阳离子度较高,同时稳定性较好的胶乳产品.在造纸工业中,它是一种理想的助留助滤剂.“,”Amphoteric p olyacrylamide was prepared first by the copolymerization of acrylamide with sodi um-acrylate and then through Mannich reaction.The copolymerization was carried o ut with a redox initiation system using the method of inverse emulsion polymeriz ation.In this paper the reaction conditions and factors that affect emulsion sta bility were studied.Experiments show that a stable latex can be obtained under t he following conditions:anionic degree is five percent,the ratio among acrylamid e,formaldehyde and dimethylamine is 1:1:1.2,reaction temperature is 45 ℃,reac tion time lasts four hours,and pH equals 5.0.The amphoteric copolymer has a high er molecular weight and cationic degree,so it is an ideal filler retention and d rainage aid in paper making.