阳离子聚丙烯酰胺水包水乳液絮凝性能的研究

Preparation and Application of Water-in-Water Type Cationic Polyacrylamide Emulsion as Flocculation

摘要:

本文以分子量为20000的聚乙二醇（PEG20000）为分散剂，将丙烯酰胺（AM）、甲基丙烯酰氧乙基三甲基氯化铵（DMC）、N,N-亚甲基双丙烯酰胺（MBA）进行自由基共聚，得到了具有较低表观黏度，较高固含量的阳离子聚丙烯酰胺（CPAM）水包水乳液。研究了PEG20000，DMC、引发剂（KPS）、聚合温度等因素对聚合体系的表观黏度的影响；对高岭土的絮凝试验表明：在聚合温度为40℃，反应时间5~8小时，w(PEG20000)=80%、w(KPS)= 0.8%条件下，当w(MBA）=0.3%，w(DMC)= 10%，产品的絮凝效果较好，且有良好的稳定性。透射电镜分析表明，分散相液滴以球状和丝状分散于体系当中；红外光谱分析表明，CPAM分子结构中含有AM、DMC和MBA的反应后的特征链节。

Abstract:

Water-in-water type cationic polyacrylamide (CPAM) emulsions with low viscosity, high polymer content and high stability were synthesized by radical copolymerization of acrylamide（AM）,Methacrylatoethyl trimethyl ammonium chloride (DMC) and N,N′-methylenediacrylamide (MBA) as the monomers in the polyethylene glycol 20000(PEG 20000)solution. The effects of PEG2000,DMC, initiator(KPS),polymerization temperature on viscosity were studied; Kaolin flocculating tests shows：Under the condition the temperature is 40℃~50%,the reaction time 5 hours ~8 hours, w(PEG20000)=80%、w(KPS)= 0.8%,when w(MBA）=0.3%，w(DMC)= 10%，the product has better flocculating performance and good stability. Transmission electron microscope（TEM）shows spherical droplets and stripe shape droplets dispersed throughout aqueous dispertion.Infrared spectrum shows the synthesized polymer chain contents AM chain unit 、DMC chain unit and MBA chain unit.