烷基苯磺酸钠长链烷基中二甲基苯取代位置与起泡性的关系

 摘要： 采用改进的Ross-Miles法研究了3种十七烷基芳基磺酸盐表面活性剂（C17-2S、C17-6S、C17-8S）的泡沫性能，重点考察了表面活性剂分子结构、质量浓度、温度、氯化钠对它们的泡沫性能的影响。结果表明，随表面活性剂分子结构中苯环向烷基链中心移动，表面活性剂的泡沫性能变好。随表面活性剂质量浓度的增大，起泡能力增强，当浓度达到1g/L时，发泡高度不再随浓度增大而改变,而是趋于一个稳定值。半衰期也随浓度增大而先下降，达到最低点后又回升到某一稳定值。温度升高，表面活性剂的起泡性能增强；稳泡性能减弱。有盐存时表面活性剂的起泡性能变差，随氯化钠浓度的升高泡沫高度一直下降。

THE RELATIONSHIP BETWEEN FOAMING PROPERTIES AND THE SUBSTITUTED POSITION OF DIMETHYLPHENYL IN LONG ALKYL CHAIN OF SODIUM ALKYL BENZENE SULFONATES

Three sodium branched-alkyl benzene sulfonates were synthesized from m-xylene, fat chloride and alkyl bromide.The effects of the molecular structure, concentration, temperature and sodium chloride on their foam properties were investigated by Ross-Miles method.The results showed that with the dimethylphenyl moving to the center of the long alkyl chain, both foaming power and foam stability of sodium branched-alkyl benzene sulfonates were improved.As the mass concentration of sodium branched-alkyl benzene sulfonate increased, the foaming power increased firstly and then kept steady, while foam stability decreased firstly and then kept steady.As the temperature rose, the foaming power increased and the foam stability decreased.As the concentration of sodium chloride increased, the foaming power weakened.