Abstract: Two kinds of bis-(nonylphenyl alkyl ether) sulfonate Gemini surfactant were synthesized with nonyl phenol,dibromo alkanes and chloro sulfonic acid as main starting materials.Ultrasonic wave was applied to the synthesis of the intermediates.Reaction conditions of the bis-ether intermediates were optimized by orthogonal designed experiments,and the effect of ultrasonic power on the yield was investigated.Structures of the products were characterized by FTIR,HPLC/MS and ¹HNMR.The surface activity,emulsifying performance and foam performance of the products were studied.Methyl silicone oil was emulsified by a blend emulsifier of the product Gemini A and Span 80.Results showed that the suitable reaction conditions for synthesis of the intermediates are:n(nonyl phenol):n(dibromo alkanes)=2.02:1;alkali dosage,20% (mass fraction);reaction temperature,65 ℃ for 1.5 h and with ultrasonic power of 250 W.Gemini surfactants display a higher surface activity and better emulsification and foam performance.Stable silicone oil emulsion is obtained with blend emulsifier containing the Gemini surfactant.

Key words: Gemini surfactant, ultrasonic wave, critical micelle concentration, performance, methyl silicone oil emulsion