N-酰基氨基酸型表面活性剂与离子液体表面活性剂复配体系流变性研究

doi:10.3969/j.issn.1001-1803.2020.10.005

摘要/Abstract

摘要：

通过表面张力和流变性的测定研究了离子液体表面活性剂1-十四烷基-3-甲基咪唑溴盐（[C₁₄Mim][Br]）与月桂酰基肌氨酸钠（SLS）、月桂酰基谷氨酸钠（SLGLU）和月桂酰基甘氨酸钠（SLG） 3种N-酰基氨基酸型表面活性剂之间的相互作用和不同复配比例时混合体系的流变特征。除SLG外,SLS和SLGLU与不同摩尔分数（x）的[C₁₄Mim][Br]具有良好的复配稳定性。SLS、SLGLU分别与[C₁₄Mim][Br]复配后降低水溶液表面张力能力具有协同增效作用,SLGLU与[C₁₄Mim][Br]的协同增效作用大于SLS与[C₁₄Mim][Br],其最佳复配x分别为0.7和0.5。SLS与[C₁₄Mim][Br]和SLGLU与[C₁₄Mim][Br]两种混合体系在大部分复配比例时都没有触变环,只有x=0.4~0.5的SLS+[C₁₄Mim][Br]混合溶液和x=0.7的SLGLU+[C₁₄Mim][Br]混合溶液呈现了触变环。两种复配体系都具有剪切变稀的特点,这可能与复配体系中形成了囊泡有关。除了x=0.5的SLS+[C₁₄Mim][Br]混合溶液外,这两种复配体系的黏度基本不随剪切时间而改变,具有良好的耐剪切性。

关键词: 表面活性剂, 离子液体, 氨基酸, 相互作用, 流变性

Abstract:

The interactions between an ionic liquid surfactant （1-tetradecyl-3-methylimidazolium bromine, [C₁₄Mim][Br]） and three N-acyl amino acid surfactants （sodium lauroyl sarcosinate （SLS）, sodium lauroyl glutamate （SLGLU） and sodium lauroyl glycinate （SLG））, and the rheology of the mixed aqueous systems of [C₁₄Mim][Br]/SLS and [C₁₄Mim][Br]/SLGLU with different mole fractions （x） of [C₁₄Mim][Br] were studied by the determination of surface tension and rheology. Except SLG, the N-acyl amino acid surfactants under investigation showed a good formulation stability when mixed with [C₁₄Mim][Br]. The surface tension of mixed solutions of [C₁₄Mim][Br]/SLS and [C₁₄Mim][Br]/SLGLU were both indicative of synergistic effect. The synergistic effect between [C₁₄Mim][Br] and SLGLU was larger than that between [C₁₄Mim][Br] and SLS, and the optimum x were 0.7 and 0.5, respectively. When a series of aqueous solutions of [C₁₄Mim][Br]/SLS and [C₁₄Mim][Br]/SLGLU were tested by thixotropy, there was no thixotropic loop for the mixed solutions except the solutions of [C₁₄Mim][Br]/SLS at x=0.4-0.5 and the solution of [C₁₄Mim][Br]/SLGLU at x=0.7. The two series of aqueous solutions showed the characteristics of shear thinning, which might be related to the formation of vesicles in the mixed systems. Except for the mixed solution of [C₁₄Mim][Br]/SLS at x=0.5, no significant change was observed in the viscosity of the two mixed systems with shear time, indicative of good shear resistance.

Key words: surfactant, ionic liquid, amino acid, interaction, rheology

中图分类号:

TQ423

惠蒙蒙,白亚榕,杨许召,张晨龙,王军. N-酰基氨基酸型表面活性剂与离子液体表面活性剂复配体系流变性研究[J]. 日用化学工业, 2020, 50(10): 681-686.

HUI Meng-meng,BAI Ya-rong,YANG Xu-zhao,ZHANG Chen-long,WANG Jun. Rheology of the mixed aqueous systems of N-acyl amino acid surfactant and ionic liquid surfactant[J]. China Surfactant Detergent & Cosmetics, 2020, 50(10): 681-686.

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	n（AAS）∶n（[C₁₄Mim][Br]）
	0.8∶0.2	0.7∶0.3	0.6∶0.4	0.5∶0.5	0.4∶0.6	0.3∶0.7	0.2∶0.8	0.1∶0.9
SLS	+	+	+	+	+	+	+	+
SLGLU	+	+	+	+	+	+	+	+
SLG	-	-	-	-	-	-	-	+