咪唑啉基季铵盐型双子表面活性剂的合成与性能

Synthesis and Properties of Quaternary Ammonium Imidazolines Gemini Surfactants

摘要:

摘要：以环氧氯丙烷为联接剂，油酸、二乙烯三胺分别为疏水和亲水基团的初始原料合成了一种咪唑啉基季铵盐型双子表面活性剂，通过IR ，1HNMR验证了目标产物结构。研究了其在水溶液中对苯的乳化力、稳泡能力、亲水亲油平衡值、表面张力。动态激光散射法测试了双子咪唑啉基季铵盐乳化制备O/W型乳状液的乳胶粒径尺寸，利用双子表面活性剂作为乳化剂油酸为分散相。静态失重法评价了双子表面活性剂作为缓蚀剂对Q235钢在8 %溶液中的缓蚀性能。结果表明：所合成的双子咪唑啉基季铵盐具有较好的表面活性，临界胶束浓度CMC约为2×10-4 mol/L，γCMC为31.40 mN•m-1，其HLB值为14.2，对苯的乳化能力及稳泡性能良好。其乳液稳定，使用温度在25～50 ℃范围时，O/W的乳液的胶粒尺寸介于216～236nm，是一种性能良好的O/W型乳化剂。失重法测定结果表：这种双子咪唑啉基季铵盐型表面活性剂缓蚀性能优于相应单链咪唑啉季铵盐表面活性剂。

Abstract:

Abstract: Quaternary ammonium imidazoline gemini surfactant was synthesized by using epichlorohydrin as coupling agent, oleic acid as hydrophobic chain diethylenetriamine as hydrophilic chain, and structure of the gemini surfactant was characterized by IR and 1HNMR。Emulsifying power for benzene, foam stability, HLB, aqueous solution surface tension of the gemini surfactant was investigated. Dynamic laser light scattering method was utilized to characterize the particle size distribution of O/W emulsion, in which oleic acid was the dispersed phase using the gemini surfactant as emulsifier. Static weight loss method were used to evaluate the corrosion inhibition performance of the gemini surfactant as corrosion inhibitors for Q235 steel in 8 % HCl. It was shown critical micelle concentration of the gemini surfactant was 2×10-4 mol/L, γCMC was 31.40 mN•m-1, HLB was 14.2, the quaternary ammonium gemini surfactants had good surface activity, steady foam power and excellent emulsifying performance to benzene. The results of particle size distribution indicate that the latex particle dimension of O/W emulsion is between 216～236 nm with narrow distribution at emulsifying temperature 25 ~50℃, and the quaternary ammonium imidazolines gemini surfactant is a good performance O/W emulsifier. The static weight loss tests show that the inhibition efficiency of quaternary ammonium imidazolines gemini surfactant is superior to that of the corresponding single-chain quaternary ammonium imidazolines surfactant.