星形聚丙烯酰胺接枝淀粉的合成及应用

Synthesis and application of star polyacrylamide grafted starch

介绍了应用水溶液聚合方法合成了星形聚丙烯酰胺(SPAM)的方法。采用正交实验方法研究了不同的引发剂用量、相对分子质量调节剂用量、聚合体系温度对SPAM特性黏数的影响,从中优化出最佳反应条件为单体质量分数为15%,聚合温度为35℃,引发剂质量分数为(相对单体质量,下同)0.04%,螯合剂为0.005%,抗交联剂为0.015%,聚合体系pH值为5,得到的星形聚丙烯酰胺特性黏数为989.2mL/g。星形聚丙烯酰胺在35℃进行氯胺化反应并加到糊化好的淀粉溶液中,在40～50℃下反应40min,即得到星形聚丙烯酰胺接枝淀粉絮凝剂。结果说明,星形聚丙烯酰胺接枝淀粉絮凝剂溶解性好、絮凝能力强,具有良好的絮凝效果。

Star polyacrylamide（SPAM） was synthesized by the aqueous solution copolymerization method. The effect of various initiator weight dosage, molecular weight regulation agent dosage and temperature of copolymerization system on SPAM intrinsic viscosity waas analyzed and discussed with the orthogonal experiment method.The optimum conditions of reaction were obtained as follows： monomer mass concentration 15%, temperature of copolymerization 35℃, initiator weight dosage 0.04% （relative to monomer mass）, chelate agent dosage 0.005%, anticrosslinking agent dosage 0.015%, pH value of copolymerzation system 5 and SPAM intrinsic viscosity 989.2 mL·g^-1 Chloramination of SPAM was conducted at 35 and then was added into starch solution. After reaction for 40 minutes at 40-50℃ the SPAM grafted starch flocculuating agent was obtained.The application experiment showedthat the SPAM grafted starch flocculating agent has good solubility, strong flocculation capability and good flocculation effect.