水膨性暂堵剂的制备及表征

Preparation and characterization of water-swelling temporary plugging agent

以丙烯酰胺、丙烯酸钠为聚合单体,膨润土为填充剂,聚乙二醇二丙烯酸酯、N,N'-亚甲基双丙烯酰胺为交联剂、过硫酸钾与亚硫酸钠为氧化还原引发剂,制备了环保的可降解水膨性暂堵剂并研究了其性能。采用水溶液聚合法,通过改变膨润土、淀粉、交联剂、引发剂量,考察各因素对暂堵剂的性能影响。结果表明,当反应温度50℃,交联剂用量占单体的0.02%,引发剂用量占单体的0.6%,膨润土添加量5%(占总质量的百分数),该条件下合成的暂堵剂韧性较好,吸水率达184 g/g,19 h完全降解。在原有配方中分别加AMPS、淀粉以提高暂堵剂降解速度,并通过SEM对暂堵剂进行表征。

The environmental degradable water bentonite were prepared and its properties were studied by acrylamide and sodium acrylate as polymerization monomers,bentonite as filler,polyethylene glycol diacrylate and N,N＇-methylenebisacrylamide as crosslinking agents,potassium persulfate and sodium sulfite as initiators. The effects of various factors on the properties of temporary plugging agent were investigated by changing the bentonite,crosslinking agent,initiator dosage and neutralization degree of AA under aqueous solution polymerization method. The results showed that when the reaction temperature was 50 ℃,the amount of cross-linking agent accounted for 0. 02% of the monomer,the amount of initiator accounted for0. 6% of the monomer,the amount of bentonite was 5%（ the percentage of total mass）,the temporary plugging agent,which synthetised by this way,its rate of the water absorption was 184 g/g and its dissolution time was 19 h. AMPS and starch were added to improve the degradation rate of temporary plugging agent,and the performance of temporary plugging agent was characterized by SEM.