Abstract: Critical micelle concentration (cmc) of molecular deposition filming flooding agent (MDFFA) and sodium dodecyl sulfate (SDS) mixed systems were determined by conductivity method, and the effect of MDFFA on the precipitating behavior of anionic surfactant and multivalent cation was studied by means of light transmission measurement. The results show that MDFFA can decrease the cmc of SDS, the cmc decreases with the increasing of the concentration of MDFFA. With the increasing of temperature from 25 ℃ to 50 ℃, the cmc of  2 mmol/L MDFFA/SDS mixed system decreased. The cmcof 2 mmol/L MDFFA/SDS decreased with the increasing of concentration of NaCl. The precipitating behavior did not happen when MDFFA and SDS were mixed. MDFFA can restrain the precipitating behavior of anionic surfactant and Ca²⁺. The capability of MDFFA restrain the precipitating behavior is better than NaCl, NaOH and NaHCO₃.

Key words: Molecular deposition filming flooding agent (MDFFA) ,   ,  Sodium dodecyl sulfate (SDS)  ,    , Critical micelle concentration   ,  ,  Precipitate

摘要： 通过电导率法测定临界胶束浓度(cmc),研究了MD膜驱剂与阴离子表面活性剂(SDS)混合体系的胶
束性质,通过透光率法研究了MD膜驱剂对阴离子表面活性剂与多价阳离子沉淀行为的影响。结果表明,MD膜驱
剂与SDS混合后可降低SDS的cmc,并且cmc随着MD膜驱剂浓度的增加而减小;温度从25℃升至50℃,2mmol/L
的MD膜驱剂/SDS混合体系的cmc降低;在所考察范围内,NaCl的加入有利于混合体系cmc的降低。MD膜驱剂与
SDS混合后没有发生沉淀现象,且MD膜驱剂可抑制SDS与多价阳离子Ca2+ 的沉淀行为,其效果比NaCl,NaOH 和
NaHCO₃ 抑制SDS与多价阳离子Ca ²⁺ 沉淀的效果好。

关键词: MD膜驱剂  ,   , 十二烷基硫酸钠 ,    , 临界胶束浓度  ,   ,  沉淀