反相乳液聚合法制备驱油用高分子表面活性剂

采用反相乳液聚合法,以(NH4)2S2O8-NaHSO3为氧化-还原引发剂,Span80/OP-10为复合乳化剂,十二胺为助乳化剂,将一种阴离子型表面活性单体MS(一种分子中具有耐水解的N-烷基丙烯酰胺结构的磺酸盐型单体)、N,N-二异辛烷基丙烯酰胺疏水单体(DiC8AM)与丙烯酰胺(AM)共聚制得AM-MS-DiC8AM(简称PMD)共聚物。实验结果表明,制备PMD共聚物的较佳条件为:反应温度40℃;反应时间5h;n((NH4)2S2O8)∶n(NaHSO3)=1∶1,w(引发剂)=0.10%(基于总单体);控制Span80/OP-10复合乳化剂的亲水亲油值在5～6之间;AM,MS,DiC8AM的用量(基于聚合体系的质量)分别为23.6%,6.0%,0.4%。在较佳条件下制备的PMD共聚物水溶液具有较高的表面活性、表观黏度和抗盐能力(黏度保留率为62.2%)。

Preparation of Polymeric Surfactant Used in Enhanced Oil Recovery by Inverse Emulsion Polymerization

A novel polymeric surfactant—AM-MS-DiC_8AM(AM: acrylamide;MS: a novel sulfonate surfactant monomer;DiC_8AM: N,N-dioctylacrylamide) was synthesized through inverse emulsion polymerization with(NH_4)_2S_2O_8-NaHSO_3 as initiator,and Span80/OP-10 and dodecylamine as composite emulsifier.The effects of reaction temperature,initiator dosage,emulsifier type,monomer concentration,DiC_8AM dosage and MS dosage on the emulsion properties were studied.The results showed the optimal conditions were: reaction temperature 40 ℃,reaction time 5 h,hydrophilic-lipophilic balance 5-6,n((NH_4)_2S_2O_8)∶n(NaHSO_3)1∶1,mass fraction of initiator 0.10%(based on all monomers),and mass fractions of AM,MS and DiC_8AM 23.6%,6.0% and 0.4%(based on polymerization system) respectively.Some properties of the polymeric surfactant synthesized under the optimal conditions were measured,and the results showed that the copolymer exhibited excellent surface/interfacial activity,good salt resistance(viscosity reserve rate 62.2%) and high apparent viscosity.