Abstract
The surface properties of the binary mixture of cetyl diphenyl ether disulfonate (C16-MADS) and linear alkylbenzene sulfonate (LAS) have been investigated by salinity and hardness tolerance, equilibrium surface tension, wettability, foam and emulsification measurements. The results show that with increasing mass ratio of LAS in the C16-MADS/LAS mixed system, the ability to reduce the surface tension of the solution is improved. The wetting performance is also improved. The critical micelle concentration (CMC) values are increased first, then decreased, and are higher than the ideal CMC values, which indicates that there is an antagonistic effect that is not conducive to the formation of mixed micelles between C16-MADS and LAS. In addition, the C16-MADS/LAS system improves the hard water resistance of LAS and reduces the foam properties of LAS.
Kurzfassung
Die Oberflächeneigenschaften des binären Mischsystems aus Cetyldiphenyletherdisulfonat (C16-MADS) und linearem Alkylbenzensulfonat (LAS) wurden durch Messungen des Salzgehalts, der Härtetoleranz, der Gleichgewichtsoberflächenspannung, der Benetzbarkeit und des Schaum- und Emulgierungvermögens untersucht. Die Ergebnisse zeigen, dass mit zunehmendem Massenverhältnis von LAS im C16-MADS/LAS-Mischsystem sich die Oberflächenspannung der Lösung verringert sowie die Benetzungsleistung verbessert. Die Werte für die kritische Mizellenbildungskonzentration (CMC) nehmen zuerst zu, dann ab, liegen aber über den idealen CMC-Werten. Das weist auf einen antagonistischen Effekt hin, der die Bildung von Mischmizellen zwischen C16-MADS und LAS nicht fördert. Darüber hinaus verbessert das C16-MADS/LAS-Mischsystem die Hartwasserwiderstand von LAS und verringert die Schaumeigenschaften von LAS.
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