Abstract: A kind of sulfonate type gemini surfactant was synthesized with dimmer acid and sodium N-methyl-β-amino ethyl sulfonate as starting materials via acylation and Schotten-Baumann condensation;and its relevant properties were characterized.Based upon orthogonal designed experiments,the optimum reaction conditions were obtained as:reaction temperature,15 ℃;reaction time,5 h;mass fraction of NaOH,40%;molar ratio of sodium N-methyl-β-amino ethyl sulfonate to dimmer acyl chloride,2.3∶1.The product displays higher surface activities as compared with the conventional surfactants.Its γ_cmc and cmc were determined as 30.4 mN·m^-1 and 3.55×10^-4 mol·L^-1,respectively.In addition,its foaming power and foam stability is good,with foam height and foam half life 1.3-3.2 times and 12-33 times as compared with that of the conventional surfactants respectively.

Key words: gemini surfactant, synthesis, surface activity, foam property