淀粉接枝两性离子絮凝剂的制备

研究了两性单体的合成条件,以及以过硫酸铵为引发剂时,其与淀粉进行接枝共聚的规律。实验结果表明,当pH9～10,反应温度85℃,反应时间为5h时,两性单体收率最高,可达98%以上;当引发剂浓度为2.2mmol／L,单体用量(单体／淀粉)为1.8／1(质量分数),反应温度为48℃,反应时间为4h时,接枝共聚反应的G和GE均较高,且所得产品的特性粘数亦较大。

Synthesis of amphoteric copolymerric flocculant grafted on starch

This paper reports the investigation of the synthesis condition of amphoteric monomer and the rule of copolymerized grafting it on starch by using (NH4)2S2O8 as initiator. Experimental results indicate that the yield of amphoteric monomer is more than 98% under the condition: pH, 9～10;reaction temperature, 85?℃; reaction time, 5?h. The optimum variables of grafting ratio, grafting efficiency, and ［η］ of the copolymer are obtained at initiator concentration of 2.2?mmol/L,monomer dosage of 1.8/1(monomer/starch ),reaction temperature of 45?℃, and reaction time of 4?h.