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以甲基丙烯酰氧乙基三甲基氯化铵(DMC)为阳离子单体,丙烯酸(AA)为阴离子单体,丙烯酰胺(AM)为主要单体,在硫酸铵水溶液中采用偶氮二异丁基脒盐酸盐(AIBA)引发的水分散种子聚合方法成功制备出两性聚丙烯酰胺(Amphoteric Polyacrylamide,Am PAM)。通过FTIR、GPC、旋转黏度仪和激光光散射仪等分析测试手段结合胶体滴定法探讨了引发剂用量、硫酸铵浓度以及阴阳离子单体配比等因素对水分散聚合所得产物的化学结构、相对分子质量、表观黏度、平均粒径以及阴阳离子度的影响。实验表明,随着引发剂用量增加,Am PAM的重均相对分子质量平均粒径均呈减小的趋势。当硫酸铵浓度增加,共聚物分散颗粒的平均粒径增大。随着DMC/AA比值的提高,阳离子度增加。并以脱墨浆为原料,模拟新闻纸的抄造工艺与配方,探讨自制的两性聚丙烯酰胺的分子量对成纸力学性能和印刷适应性的影响。结果表明Am PAM相对分子质量为1.38×105时,纸张强度性能得到显著提高,抗张指数为23.8N·m/g,临界拉毛速度为0.54m/s。
With methacryloyloxyethyltrimethylammonium chloride (DMC) as cationic monomer, acrylic acid (AA) as anionic monomer and acrylamide (AM) as main monomer, ammonium azodicarbonate Amphoteric Polyacrylamide (Am PAM) was successfully prepared by aqueous dispersion seed polymerization induced by isobutylamidine hydrochloride (AIBA). The chemical structures of the products obtained by water-dispersion polymerization were investigated by means of analytical methods such as FTIR, GPC, rotational viscometer and laser light scattering, colloidal titration, initiator concentration, ammonium sulfate concentration and the ratio of anionic and cationic monomers. Molecular weight, apparent viscosity, average particle size and the degree of anion and cation. Experiments show that, with the increase of initiator, Am PAM weight average molecular weight average particle size showed a decreasing trend. As the ammonium sulfate concentration increases, the average particle size of the dispersed particles of the copolymer increases. As the DMC / AA ratio increases, the degree of cation increases. In addition, the deinking pulp was used as raw material to simulate the papermaking process and formula of newsprint, and the influence of the molecular weight of homemade amphoteric polyacrylamide on the mechanical properties and printing adaptability of the paperboard was discussed. The results showed that the relative molecular mass of Am PAM was 1.38 × 105, the tensile strength of paper was significantly increased, the tensile index was 23.8N · m / g and the critical drawing speed was 0.54m / s.