Synthesis and Surface-Active Property of Bis-Quaternary Ammonium Salt-Sulfate Zwitterionic Gemini Surfactant

N,N-dimethyldodecylamine,hydrochloride and epichlohydrin(mole rate is 2∶1∶1) were used to synthesize bis-quaternary ammonium salt Gemini surfactant with a hydroxyl in its space group by a one-pot method.The hydroxyl was sulfonated by chlorosulfonic acid and then neutralized to afford bis-quaternary ammonium salt-sodium sulfate zwitterionic Gemini surfactant with three-head groups.The yield of the last two-step product is 78%,and the melting point of final product is 231~(233℃.) Its structure was characterized by IR(infrared spectrum),~1H NMR(~1H nuclear magnetic resonance),MS(mass spectrum),and EA(elmements analysis).Surface-active property was investigated.Critical micelle concentration and surface tension of the novel zwitterionic Gemini surfactant in aqueous solution at(15℃) are 7.2×10~(-5)mol/L,34.5 mN/m respectively.