Abstract: Erucic acid and N,N-dimethyl-1,3-propane diamine were used as starting materials for preparation of erucoylamidopropyl dimethylamine via condensation.The latter was further quaterized with sodium 3-chloro-2-hydroxy propane sulfonate,which was formed by reaction between sodium hydrosulfite and epichlorihydrin,for synthesis of the targeted product erucoylamidopropyl hydroxysulfobetaine.Optimization of the synthesis conditions was studied.The targeted product was characterized by IR,and its performance was evaluated.Experimental results showed that the optimum conditions for the condensation are as follows:n(erucic acid)∶n(N,N-dimethyl-1,3-propane diamine)=1∶1.1,reaction temperature 160 ℃,reaction time 10 h,catalyst dosage 1.5%.Under the above mentioned conditions the yield can achieve 82.7%.The optimum conditions for the quaterization are:n(erucoylamidopropyl dimethylamine)∶n(sodium 3-chloro-2-hydroxy propane sulfonate)=1∶1.1,reaction temperature 85 ℃,reaction time 8 h.Under these conditions the yield of the quarterization can achieve 88.1%.The cmc of the targeted product is 1.78×10^-5 mol·L^-1.The γ_cmc achieves 40.1 mN·m^-1 at 30 ℃,and 30.6 mN·m^-1 at 60 ℃.Tolerance to Ca²⁺ achieves 8 g·L^-1.Apparent viscosity of a solution of the targeted product with mass fraction of 2% achieves 204 mPa·s.

Key words: ampholytic surfactant, erucoylamidopropyl hydroxysulfobetaine, surface properties