Here, we present results from a systematic study on cleaning of oily deposits from solid surfaces (porcelain and stainless steel) by solutions of fatty acid sulfonated methyl esters (SME), sodium salts. The zwitterionic dodecyldimethylamine oxide (DDAO) has been used as a cosurfactant. As representatives of the vegetable and mineral oils, sunflower seed oil and light mineral oil have been used. The process of oil drop detachment from the solid substrates (roll‐up mechanism) has been monitored. In the case of porcelain, excellent cleaning of oil is achieved by mixed solutions of SME and DDAO. In the case of stainless steel, excellent cleaning (superior than that by linear alkylbenzene sulfonate and sodium lauryl ether sulfate) is provided by binary and ternary mixtures of SME, which may contain also DDAO. For the studied systems, the good cleaning correlates neither with the oil/water interfacial tension, nor with the surfactant chainlength and headgroup type. The data imply that governing factors might be the thickness and morphology of admicelle layers formed on the solid/water interface. The results indicate that the SME mixtures represent a promising system for formulations in house‐hold detergency, having in mind also other useful properties of SME, such as biodegradability, skin compatibility, and hard water tolerance.

中文翻译：

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磺化脂肪酸甲酯混合溶液的清洗能力

在这里，我们介绍了通过脂肪酸磺化甲酯（SME），钠盐溶液清洁固体表面（瓷和不锈钢）上的油性沉积物的系统研究结果。两性离子十二烷基二甲基氧化胺（DDAO）已用作助表面活性剂。作为植物油和矿物油的代表，已经使用了葵花籽油和轻质矿物油。已经监测了油滴从固体基材上脱落的过程（卷绕机制）。对于瓷器，SME和DDAO的混合溶液可实现出色的油污清洁效果。对于不锈钢，SME的二元和三元混合物还可以提供出色的清洁效果（优于线性烷基苯磺酸盐和月桂基醚硫酸钠），其中还可能含有DDAO。对于研究的系统，良好的清洁度与油/水界面张力无关，也与表面活性剂链长和头基类型无关。数据暗示控制因素可能是在固体/水界面上形成的胶束层的厚度和形态。结果表明，SME混合物代表了家用洗涤剂配方的理想系统，同时还考虑了SME的其他有用特性，例如生物降解性，皮肤相容性和硬水耐受性。