N-月桂酰基谷氨酸钾/芥酸钾复合阴离子表面活性剂蠕虫状胶束及其性能研究

Preparation and Properties of Potassium N-Lauroylglutamate/Potassium Erucate Composite Anionic Surfactant Wormlike Micelles

  • 摘要:N-月桂酰基谷氨酸钾(KLAD)、芥酸钾(KEU)及两者复合体系(KAU)为研究对象,分别考察了KCl及不同有机反离子对KLAD、KEU及KAU水溶液性能的影响,优化出KLAD/KCl、KEU/苄基三丙基氯化铵(BTAC)及KAU/BTAC/KCl3种黏弹性蠕虫状胶束体系. 通过表观黏度法研究了3种体系的耐温及耐剪切性能,并对各体系的破胶性能及携砂性能进行了评价. 结果表明,T=100℃时,KLAD/KCl及KEU/BTAC体系的表观黏度(ηa)仅为19.2和37.7mPa·s,而KAU/BTAC/KCl体系的ηa高达82.5mPa·s;T=100℃且连续剪切60min后,KLAD/KCl及KEU/BTAC体系的ηa分别降至14.0mPa·s和19.3mPa·s,而KAU/BTAC/KCl体系仍保持在52.9mPa·s以上. 携砂比为10%时,3种体系的沉降速度分别为0.294,0.113及0.067cm·min-1. KAU/BTAC/KCl体系耐较高温度、耐剪切,携砂性能优越. 有机反离子BTAC与无机反离子KCl对蠕虫状胶束具有较高表观黏度产生了协同效应.

     

    Abstract: The effect of different counterions, including inorganic salt(KCl) and different organic salts, on the properties of solutions of potassium N-dodecanoyl glutamate (KLAD), potassium erucate (KEU) and their mixed system (KAU) was studied respectively, then three viscoelastic wormlike micelles systems were obtained, including KLAD/KCl, KEU/benzyltripropylammonium chloride(BTAC) and KAU/BTAC/KCl. The temperature (T) and shear resistance of the three systems were compared by viscosimetry method, and their sand-carrying performance and gel breaking property were also investigated. The results showed that the apparent viscosity (ηa) of systems of KLAD/KCl and KEU/BTAC were 19.2mPa·s and 37.7mPa·s at 100℃, but the ηa of KAU/BTAC/KCl solution was up to 82.5mPa·s. After shearing 60 min incessantly at 100℃, the ηa of solutions of KLAD/KCl and KEU/BTAC decreased to 14.0mPa·s and 19.3mPa·s respectively, however, the ηa of KAU/BTAC/KCl solution still maintained at 52.9mPa·s. When the sand carrying ratio was 10%, the sedimentation rates of the seeds in the three systems were about 0.294cm·min-1, 0.113cm·min-1 and 0.067cm·min-1 at 30℃, respectively. For all systems, the viscosity of the gel breaking liquid without residue decreased below 5mPa·s within 2 hours. The better temperature and shear resistance of KAU/BTAC/KCl system indicated that BTAC and KCl produced a synergistic effect on the wormlike micelles with high viscosity.

     

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