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分别采用改进的Ross-Miles法及分水时间法,对3种新型孪尾Gemini两性离子表面活性剂(C8C8L3Sz、C8C8L4Sz和C10C8L3Sz)的泡沫性能及乳化性能进行了研究,并考察了表面活性剂浓度、分子结构和温度等对其的影响。结果表明,该系列表面活性剂具有较好的泡沫性能,且随其浓度的增加,泡沫最大高度和半衰期均存在一个稳定值,疏水链越长,其起泡性能越差,泡沫稳定性越好;温度升高,起泡性能变好,泡沫稳定性变差;当表面活性剂浓度一定时,体系中加入低浓度的短链醇及无机盐均能提高泡沫的稳定性;C8C8L3Sz、C8C8L4Sz和C10C8L3Sz作乳化剂的最适宜的用量分别为6×10-4、6×10-4和4×10-4mol/L,疏水基越长,乳化性能越好,而连接基对其影响较小;温度升高,乳化性能变差;当油相烷烃碳数相同时,环烷烃要比直连烷烃更易达到最佳乳化效果,但二者的乳状液稳定时间相当;对于油相烷烃碳数不同时,烷烃的碳链越长,乳状液的稳定性越差,乳化效果越不好。
The foam properties and emulsifying properties of three new twin Gemini amphoteric surfactants (C8C8L3Sz, C8C8L4Sz and C10C8L3Sz) were studied by the improved Ross-Miles method and the time-division method. The effects of surfactant concentration , Molecular structure and temperature on its impact. The results show that the surfactant has good foam properties. With the increase of its concentration, the maximum height and half-life of the foam have a stable value. The longer the hydrophobic chain, the worse the foaming property and the better foam stability When the surfactant concentration is constant, the stability of the foam can be improved by adding low concentration of short-chain alcohols and inorganic salts to the system; the temperature of the foam increases, the foaming performance becomes better and the stability of the foam becomes worse; the stability of the foam is improved by adding C8C8L3Sz, C8C8L4Sz and C10C8L3Sz The optimum dosage of emulsifier was 6 × 10-4, 6 × 10-4 and 4 × 10-4mol / L, respectively. The longer the hydrophobic group, the better the emulsifying property and the less influence of the linker. The temperature When the number of alkanes in the oil phase is the same, naphthenes are easier to achieve the best emulsification effect than the direct paraffins, but the emulsion stability time of the two is quite equivalent. When the carbon number of the oil phase alkanes is different, The longer the carbon chain of the alkane, the poorer the stability of the emulsion is and the worse the emulsifying effect is.