Synthesis of Gemini surfactant with waste polyester

A biquaternaryammonium salt surfactant with ester bond was synthesized using waste polyester,ethylene glycol,chlorinated sulfoxide and N,N-demethyldodecylamine.The optimum reaction conditions obtained by orthogonal experiment are as follows:n(intermediate):n(N,N-demethyldodecylamine)=1:2.1,reacting at 57℃ for 12 h.The product structures were characterized by IR and color reaction.The surface tension,melting point,foaming and solving properties of the product were tested.It was found that its critical micelle concentration value is 1.47×10-4mol/L and the surface tension value is 28.56mN/m.The surface activity is obviously lower than that of commonly used commercial surfactants.