阴离子乳化沥青稳定性与油水界面张力的关系

采用旋转滴界面张力法和残留物含量差值法考察阴离子乳化剂、助剂和皂液pH值等对皂液-沥青甲苯模拟油界面张力和乳化沥青贮存稳定性的影响。结果表明:乳化剂、助剂和皂液pH值等对油水界面张力和贮存稳定性的影响规律是一致的,两者呈现出较好的相关性;随着乳化剂和羧甲基纤维钠用量的增加,油水界面张力降低,贮存稳定性变好;随着皂液pH值的升高,界面张力和贮存稳定性分别呈现出变小和变好的趋势,在pH=11时,界面张力值最小,贮存稳定性最好;随着缔合型增稠剂T用量的增加,油水界面张力先增加后减小,贮存稳定性先变差后变好,两者最后都趋于稳定;乳化剂和助剂对油水界面张力和贮存稳定性的影响的由大到小顺序为乳化剂SD-2、缔合型增稠剂T、羧甲基纤维素钠。

Relationship between stability of anionic asphalt emulsion and oil-water interfacial tension

The influence of anionic emulsifier,additives and soap solution pH value on the interfacial tension of soap solution-toluene model oil with asphalt and the stability of asphalt emulsion was investigated.The results show that the effect regularities of anionic emulsifier,additives and soap solution pH value on the interfacial tension and the stability have good correlation.The interfacial tension decreases with the emulsifier and CMC content and the pH value of system increasing,which results in higher stability.With the pH value of 11,the interfacial tension is the minimum and the stability is the highest.The interfacial tension decreases first and then increases with associative thickener(T) increasing,while the stability shows an opposite tendency.At last both of them tend towards stability.The emulsifier and additives influencing the interfacial tension and the stability in descending order are emulsifier(SD-2),associative thickener(T),CMC.