摘要
以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为单体原料,采用(NH4)-2S2O8/NaHSO3和偶氮类化合物组成的复合引发体系,通过自由基水溶液聚合法合成阳离子聚丙烯酰胺P(DMC-AM)。正交试验评价得出较佳的工艺条件是:AM/DMC质量配比为4:3,单体浓度为35%,复合引发剂浓度为0.014%,pH值为4,反应温度为30℃。在上述条件下,产物的特性粘数为8.632dLg-1,阳离子度为20.09%;用红外光谱技术对产物结构进行了表征;在其加入量为8mgL-1的条件下处理硅藻土悬浮液,上层清液透光率接近100%;比较了P(DMC-AM)、无水AlCl3和二者联合处理生活污水的不同絮凝效果,实验表明:P(DMC-AM)的絮凝效果优于无水AlCl3絮凝剂,而二者联合处理的絮凝效果更佳。
Cationic polyacrylamide is synthesized by aqueous solution polymerization with acrylamide(AM) and methacryloyloxyethyltrimethyl ammonium chloride(DMC) as monomers in compounded initiator system consisting of(NH4)2S2O8/NaHSO3 redox system and azo-compound.The obtained optimum reaction conditions of orthogonal experiment are the mass ratio of AM:DMC 4:3,the monomer concentration 35%,the concentration of compounded initiator system 0.014%,pH 4,the reaction temperature 30℃.Under above conditions,the intrinsic viscosity of product is 8.632dL·g-1,cationic degree is 20.09%;the structure of obtained product is characterized by FT-IR;the transmittance is nearly 100% when dosage is 8mg·L-1in diatomite suspension;The article compares the flocculent effect of P(DMC-AM)、AlCl3 and combining the two flocculants together to processing life sewage,the results of experiments state that the flocculent effect of P(DMC-AM) is better than common flocculant AlCl3,and that of combining the two flocculants together is the best.
关键词
复合引发体系
正交试验
阳离子聚丙烯酰胺
特性粘数
絮凝剂
compounded initiator system
orthogonal experiment
cationic polyacrylamide
intrinsic viscosity
flocculant
