The persistence of sebum after low-water-temperature washing can contribute to malodor and microbial growth during subsequent use; thus, this work focuses on improved sebum removal. The detergency of sebum at various hydrophobic–lipophilic deviation (HLD) values was performed using 0.1 w/v% C_12-13-8PO-SO₄Na and C₈-4PO-1EO-SO₄Na at 1:1 molar ratio. The detergency of synthetic sebum on 87/13 polyester/spandex was relatively poor (70% removal) at HLD = 0. Various additives (heptanol, dipropylene glycol n-butyl ether, decyltrimethyl ammonium bromide or sodium benzoate) were explored and it was found that none of them could facilitate sebum removal on the 87/13 polyester/spandex surface. On the other hand, adding low molecular weight primary amines (ethylene diamine, or monoethanolamine [MEA]) in the surfactant system without salt showed sebum removal of 70%–80% depending on the amine molecule. Adding MEA as a detergency additive with salt appeared to achieve good detergency (>80% removal) at all studied HLD numbers between −1.0 and 1.1 and the maximum detergency (approximately 90% removal) was observed at the optimum formulation (HLD = 0). The formulation pH with added MEA decreased from 11 to roughly 9. Detergency performance with added MEA was not dependent on pH within the studied basic conditions. The principal cold water sebum removal mechanism was found to be detachment of solid sebum fractions, dispersed in the detergent bath or floating on the bath surface.

中文翻译：

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改善与亲水-亲油偏差概念相关的恶臭土壤的冷水去污力

低温水洗后皮脂的持续存在会导致后续使用过程中的恶臭和微生物生长；因此，这项工作的重点是改善皮脂去除。使用 0.1 w/v% C _12-13 -8PO-SO ₄ Na 和 C ₈ -4PO-1EO-SO _{4对不同疏水-亲油偏差 (HLD) 值的皮脂去污力进行了测试}摩尔比为 1:1 的钠。在 HLD = 0 时，合成皮脂对 87/13 涤纶/氨纶的去污力相对较差（去除 70%）。探索了各种添加剂（庚醇、二丙二醇正丁醚、癸基三甲基溴化铵或苯甲酸钠），发现它们都不能促进 87/13 涤纶/氨纶表面的皮脂去除。另一方面，在不加盐的表面活性剂体系中添加低分子量伯胺（乙二胺或单乙醇胺 [MEA]），根据胺分子的不同，可以去除 70%–80% 的皮脂。在所有研究的 HLD 数介于 -1.0 和 1.1 之间时，添加 MEA 作为去污添加剂似乎可以实现良好的去污力（>80% 去除），并且在最佳配方（HLD = 0）下观察到最大去污力（大约 90% 去除） . 添加 MEA 的配方 pH 从 11 降低到大约 9。添加 MEA 的去污性能不依赖于所研究的碱性条件内的 pH 值。发现主要的冷水皮脂去除机制是固体皮脂部分的分离，分散在洗涤剂浴中或漂浮在浴表面上。