摘要
Precipitation of anionic surfactants by calcium ions has always been a major concern in formulations using anionic surfactants in hard water. In our previous work, it was found that the precipitation reaction was delayed when a mixture of anionic surfactants (sodium dodecyl sulfate and sodium octylbenzene sulfonate) was used at a certain mole ratio that would give the minimum in the difference in the supersaturation ratios between the two precipitating surfactants. In this work, the addition of nonylphenol ethoxylate (NP(EO)10) as a nonionic surfactant is shown to delay the onset of precipitation for a longer time. The zeta potential of precipitates reveals that the NP(EO)10 is able to slow down the precipitate growth by adsorbing onto the precipitate crystals and this results in larger mean particle size.
摘要译文
阴离子表面活性剂的钙离子沉淀一直是使用阴离子表面活性剂在硬水配方中的主要问题。在我们以前的工作中，我们发现当阴离子表面活性剂（十二烷基硫酸钠和钠octylbenzene磺酸盐）的混合物中，使用以一定的摩尔比，将得到的最小的差之间的过饱和比率沉淀反应被延迟2沉淀的表面活性剂。在这项工作中，在加入的壬基酚乙氧基化物（NP（EO）10）作为非离子表面活性剂的示延缓沉淀的发作的时间较长。析出物的ζ电位显示，NP（EO）10能够通过吸附在沉淀的晶体，以减慢沉淀生长，这导致较大的平均颗粒尺寸。
Sukhwan Soontravanich [1] John F. Scamehorn [1]. Use of a Nonionic Surfactant to Inhibit Precipitation of Anionic Surfactants by Calcium[J]. Journal of Surfactants and Detergents, 2010,13(1): 13-18