微胶囊乳液型聚合物对延展型表面活性剂界面张力的影响  

Effects of microcapsulated emulsion polymer on the interfacial tension of extended surfactants

作　　者：徐辉[1] Hui Xu(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《日用化学工业(中英文)》2025年第4期407-414,共8页China Surfactant Detergent & Cosmetics

基　　金：国家自然科学基金资助项目(U21B2070)。

摘　　要：为了设计高效的靶向增黏二元驱油体系,研究了微胶囊乳液型聚合物对延展型表面活性剂界面张力的作用机制。采用旋转滴方法测定了羧酸盐和硫酸盐类延展型表面活性剂(C8PmEnC和C8PmEnS)与正构烷烃间的界面张力,考察了PO数目、EO数目和离子头对延展型表面活性剂界面张力的影响规律。实验结果表明,长PO链的螺旋结构有利于界面张力降低,而长EO链的空间效应不利于降低界面张力,当PO数目≥10且EO数目≤10时,C8PmEnC和C8PmEnS分子才可能达到超低界面张力。水溶性非离子表面活性剂Tween80会增强混合体系的亲水性,明显降低延展型表面活性剂的nmin值;油溶性非离子表面活性剂Span80与延展型表面活性剂分子在溶液中形成混合胶束,不影响nmin值。当延展型表面活性剂的界面活性不够强时,靶向增黏聚合物中非离子表面活性剂与其发生竞争吸附,界面张力升高;对于界面活性较强的延展型表面活性剂,靶向增黏聚合物通过调整亲水亲油平衡影响界面张力。未破壳和破壳靶向增黏聚合物均会进一步降低油溶性较强的延展型表面活性剂的界面张力,维持超低界面张力活性。这对靶向增黏二元驱的体系设计具有指导意义。To design an efficient targeted viscosifying binary flooding system,the mechanism for the effects of microcapsulated emulsion polymer on the interfacial tension of extended surfactants was studied.The interfacial tension of carboxylate-and sulfate-type extended surfactants(C8PmEnC and C8PmEnS)against n-alkanes was measured by spinning drop method.The effects of PO number,EO number and ionic headgroups on the interfacial tension of extended surfactant solutions were investigated.The experimental results showed that the helical structure of long PO chain was beneficial to the reduction of interfacial tension,while the steric effect of long EO chain was unfavorable to the reduction of interfacial tension.Only when PO number≥10 and EO number≤10,C8PmEnC and C8PmEnS could possibly achieve ultralow interfacial tension.The water-soluble nonionic surfactant Tween80 could enhance the hydrophilicity of the mixed system and significantly reduce the nmin value of the extended surfactant.The oil-soluble nonionic surfactant Span80 and the extended surfactant molecules could form mixed micelles in solution,and thus did not affect the nmin value.When the interfacial activity of the extended surfactant was not strong enough,the nonionic surfactant from the“microcapsulated emulsion polymer”would compete with the extended surfactant for adsorption,and the interfacial tension increased.For those extended surfactants with strong interfacial activity,the targeted viscosifying polymer affected the interfacial tension by adjusting the hydrophilic-lipophilic balance.Both unbroken and broken microcapsulated emulsion polymer would further reduce the interfacial tension of those extended surfactants with strong oil solubility and maintain ultra-low interfacial tension.This work could have guiding significance for the design of targeted viscosifying binary flooding system.

关 键 词：延展型表面活性剂 微胶囊乳液型聚合物 界面张力 PO数 EO数 

分 类 号：TQ423[化学工程]