星型聚丙烯酰胺的合成及其絮凝性能研究

采用过硫酸铵、亚硫酸钠/季戊四醇作为氧化还原引发体系,合成了星型聚丙烯酰胺,用1H NMR进行结构表征。考察了引发剂比例及用量、引发体系及反应温度、单体浓度及EDTA用量、尿素用量对星型聚丙烯酰胺特性粘数及除浊率的影响规律。分析了星型聚丙烯酰胺投加量对除浊率的影响,以及相同特性粘数星型聚丙烯酰胺与线性聚丙烯酰胺的除浊率对比。结果表明,所合成的聚丙烯酰胺为平均臂数为3.2的星型聚丙烯酰胺,当投加量为2 mg/L时,对粘土悬浊液的除浊率可达到88%以上,相同特性粘数星型聚丙烯酰胺比线型聚丙烯酰胺具有更高的除浊率。

Synthesis and flocculating performance of star-poylacrylamide

Based on the mechanism of free radical polymerization,ammonium persulfate,sodium sulfite and pentaerythritol as redox initiation system,the high molecular weight star-polyacrylamide was synthesized and characterized by 1H NMR.The limiting viscosity number and the rate of turbidity removal of star-polyacrylamide were affected by a variety of factors such as proportion of initiator and amount,initiation system and temperature,monomer concentration and amount of EDTA and urea.The effect of dosage of star-polyacrylamide on the rate of turbidity removal and the comparison of the rate of turbidity removal between star-polyacrylamide and liner-polyacrylamide were analyzed.The results showed that the complex polyacrylamide is the star-polyacrylamide and the average arm number is 3.2.When the doage is 2 mg/L,the rate of turbidity removal of clay suspension is up to 88%.The rate of turbidity removal of star-polyacrylamide is higher than liner-polyacrylamide that has the same limiting viscosity number with star-polyacrylamide.