Synthesis and properties of sulfonate Gemini surfactants
WANG Jia-xin1,2, TANG Shan-fa1,2, ZHAO Cheng-yang1,2, PU Ming-zheng1,2, FAN Ying-kai1,2, ZHENG Ya-hui1,2
1. College of Petroleum Engineering, Yangtze University, Wuhan 430100, China; 2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 430100, China
Abstract: Using stearic acid,sodium 2-chloroethyl sulfonate and 1,3-propanediamine as main raw materials,a sulfonate-type anion gemini surfactant sodium N,N'-bis-stearoyl 1,3-propanediamine sulfonate (DS18-3-18) is synthesized by sulfonation,amidation and other reactions.The structure of the product is characterized by FT-IR and 1H-NMR and its microstructure is observed through scanning electron microscopy (SEM).The effects of mass fraction,shear rate and temperature on the viscosity of DS18-3-18 solution are investigated.The results show that the higher the mass fraction of DS18-3-18 solution,the stronger the tackifying ability of it;The highest economic efficiency can be achieved when DS18-3-18 solution is 4%;Increasing either shear rate or temperature always cause the viscosity of DS18-3-18 to decline firstly and then tend to be stable,showing a good temperature shear resistance.The microstructure observation for DS18-3-18 reveals that DS18-3-18 can form very dense wormlike micelles in solution through assembling by itself and the micelles entangles with each other to form a net-like structure,which promotes the increase of solution viscosity.