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以丙烯酰胺(AM)和丙烯酸(AA)为单体,2-丙烯酰胺基-2-甲基丙磺酸钠(AMPSNa)均聚物为分散稳定剂,硅藻土(Diatomite)为异相成核中心,在盐水介质中利用分散聚合法成功制备阴离子型复合絮凝剂[P(AM-co-AA)-gDiatomite,简称AAD系列]。系统考察分散介质、分散剂用量及硅藻土用量等反应参数对阴离子复合絮凝剂AAD表观黏度的影响,确定最佳反应条件。在此条件下制备的阴离子絮凝剂具有良好的稳定性和优异的絮凝性能。研究采用13 C核磁共振分析对复合絮凝剂结构进行表征。絮凝评价试验结果表明,AAD系列复合絮凝剂在絮凝过程中表现出使用剂量小(65×10-6)和絮团沉降速率快(23~28s)等优点,具有优异的絮凝效率。
Acrylamide (AM) and acrylic acid (AA) as monomers, 2-acrylamido-2-methylpropanesulfonate (AMPSNa) homopolymer as dispersion stabilizer, Diatomite heterophasic Nuclear Center, the anionic composite flocculant [P (AM-co-AA) -gDiatomite, referred to as the AAD series] was successfully prepared by dispersion polymerization in saline medium. The influence of reaction parameters such as dispersion medium, dosage of dispersant and diatomite dosage on apparent viscosity of anionic composite flocculant AAD was systematically investigated to determine the optimum reaction conditions. The anionic flocculant prepared under these conditions has good stability and excellent flocculation performance. The 13 C NMR analysis was used to characterize the complex flocculant structure. The results of flocculation evaluation showed that AAD series composite flocculant showed the advantages of small flocculation (65 × 10-6) and flocculation velocity (23 ~ 28s) in flocculation process, which has excellent flocculation efficiency.