油田用吸水性树脂的合成与性能研究

Synthesis of super absorbent resin and its property

文中以聚丙烯酸盐为主体合成的吸水性树脂是一种新型油田调驱剂 ,它是以丙烯酸、丙烯酰胺为反应单体 ,以N ,N 亚甲基双丙烯酰胺为交联剂 ,并加入聚乙烯醇 ,在 6 0℃下以过硫酸铵 /亚硫酸氢钠为引发剂合成的吸水性树脂。研究结果表明 :当交联剂质量分数在 0 0 5 %～ 0 10 %范围内时 ,吸水性树脂常温 2 5℃下吸水量较低 (340mL/ g) ,而在高温 90℃下吸水量则升高到 6 4 5g/ g ;当n(AM )∶n(AA)摩尔比在 0～ 0 14范围变化时吸盐量也由 5mL/ g提高到 6 0mL/ g ,这种吸水量依赖于温度而变化的吸水性树脂适合用作油田调驱剂。

Super absorbent resin(SAR),mainly consisting of polyacrylate,is a new kind of oil displacement profile control agent. In this paper, SAR was prepared by copolymerizing partly neutralized acrylic acid(AA), acrylamide(AM) and polyvinyl alcohol(PVA), and N,N′-methylene acrylamide as crosslinking agent with ammonium persulfate/sodium hydrogen sulfite as radical initiator in aqueous solution polymerization. The result shows that the water absorbency (645、g/g) of SAR in 90、℃ is about two times than that (340、mL/g) in 25、℃ when the mass fraction of crosslinking agent ranges from 0.05% to 0.1%. The salt absorbency of SAR rises from 5、mL/g to 60、mL/g when the ratio of n(AM) to n(AA) is from 0 to 0\^14. Thus, the high dependence of its absorbency on temperature makes it suitable to be used as an oil displacement profile control agent in oil fields.