以自制的阳离子淀粉醚St-GTA和阳离子单体甲基丙烯酰氧乙基三甲基氯化铵（DMC）为原料，合成了三元阳离子淀粉絮凝剂St-GTA-g-DMC。通过正交实验和单因素实验筛选出St-GTA的最佳合成条件为：n（CTA）：n（St）=1.2：1，催化剂NaOH加入量为0.8 g，醚化温度为70℃，醚化时间为3 h。再以硝酸铈铵（CAN）为引发剂，St-GTA与DMC接枝共聚，合成出三元阳离子淀粉絮凝剂St-GTA-g-DMC，并用FT-IR、SEM对产物结构进行了表征。此絮凝剂的特性黏度为0.82 dL/g，取代度为1.087，应用于2%高岭土溶液，在加药质量浓度为5 mg/L时，浊度可降低到53.46 NTU。

The ternary cationic starch flocculant St-GTA-g-DMC is synthesized by using the self-made cationic starch ether St-GTA and the cationic monomer methacrylatoethyl trimethyl ammonium chloride (DMC) as raw materials.Through orthogonal and single factor experiments,the optimum conditions for the synthesis of St-GTA are as follows:n(GTA)/n(starch)=1.2:1,m(NaOH)=0.8 g,and etherification lasts for 3 h at 70℃.The prepared DMC is grafted onto St-GTA with cerium ammonium nitrate (CAN) as initiator to synthesize the ternary cationic starch flocculant St-GTA-g-DMC.The structure of the flocculant product is characterized by FTIR and SEM.This flocculant has a characteristic viscosity of 0.82 dL·g^-1,and a substitution degree of 1.087.When the dosage of St-GTA-g-DMC is 5 mg·L^-1,the turbidity of the 2% kaolin solution can be reduced to 53.46 NTU.

边晓彤(1992-),女,硕士研究生,研究方向为水处理技术,bian_xt@126.com