超高相对分子质量聚丙烯酰胺合成参数的确定

Study of Super High Molecular Weight Polyacrylamide by Homopolymerization of Acrylamide

采用新型复配引发体系，以丙烯酰胺为单体，通过均聚后水解方式聚合，合成出作为油田驱油剂用的超高相对分子质量聚丙烯酰胺．考察了影响合成超高Ｍｒ（聚丙烯酰胺）的因素，确定了聚合工艺：溶液的ｐＨ值为１０．５～１１．５，起始反应温度为２℃，ｗ（单体）为３０％，ｗ（引发剂）为７０×１０－６，ｗ（链转移剂）为１２×１０－６．在优化的聚合条件下，合成出相对分子质量高达２５×１０６，水解度在２０％～３０％可调，过滤比小于１．３的聚丙烯酰胺．

The homopolymerization posthydrolysis of acrylamide initiated by a proper combined system is studied, then super high molecular weight polyacrylamide is obtained by using such an initiation system in aqueous solution, with molecular weight 25×10 6, hydrolytic degree can be adjusted between 20% and 30%, filter rate<1.3. The optimum homopolymerization posthydrolysis conditions are presented as pH 10.5～11.5, initial reaction temperature 2 ℃, monomer concentration 30%, initiation agent concentration 70×10 -6 and chain transfer agent concentration 12×10 -6 .