膨润土-聚丙烯酰胺型复合凝胶的合成及性能

SYNTHESIS AND PERFORMANCE EVALUATION OF BENTONITE-PAM COMPOUND GEL GRAIN

吸水性无机/有机复合凝胶调剖堵水剂在地层中吸水膨胀后具有较高强度韧性,可以起到调整吸水剖面和油井堵水的目的。实验以甲基丙烯酸-2-二甲氨基乙酯(DMA)为原料合成一种疏水单体甲基丙烯酰氧乙基二甲基十六烷基溴化铵(简记为DMB),利用化学插层法用DMB对膨润土进行有机改性后与丙烯酰胺进入层间交联共聚,制备了一种膨润土/聚丙烯酰胺型凝胶复合颗粒;采用单因素法优化得到了最适宜的反应条件:膨润土加量40%,AM加量40%,DMB加量1%,引发剂加量0.2%,交联剂加量0.3%时,所制得的凝胶有很好的吸水性及良好的耐温耐盐性能。

Inorganic/organic superabsorbent composite gels can be used in profile control water plugging because of their excellent mechanical property.At first,the montmorillonite minerals were modified by monomer DMB which was synthesized by 2-（Dimethylamino）ethyl methacrylate with 1-Bromohexadecane.In the second step these materials readily reacted with acrylamide to form copolymers covalently bonded to the clay using N,N-methylene-bis-acrylamide（MBA）as a crosslinker and ammonium persulfate（APS）as an initiator in aqueous solution.The results obtained from this study show the optimal synthesis conditions with AM of 40%,MMT of 40%,DMB of 1%,initiator of 0.2%and crosslinker of 0.3%.This kind of gel performs well on water absorption with good heat resistance and salt tolerance.