月桂酸钠对月桂酰基谷氨酸钠的性能影响

doi:10.3969/j.issn.2097-2806.2025.04.006

摘要/Abstract

摘要：

以月桂酰基谷氨酸钠（SLG）为研究对象，分析了月桂酸钠（SL）的含量对其表面活性参数、泡沫性能、润湿性能、乳化性能以及抗硬水能力的综合影响。结果显示，SLG的临界胶束浓度（cmc）为0.30 mmol/L，对应的表面张力（γ_cmc）为34.95 mN/m；随着SL含量的增加，SLG-SL混合溶液降低表面张力的效率下降。在泡沫性能方面，随着SL含量的增加，SLG的起泡性和稳泡性无显著变化。SLG的乳化性和润湿性随SL含量的增加均有所提升；而SL会降低SLG的抗硬水能力。

关键词: 月桂酰基谷氨酸钠, 月桂酸钠, 表面活性, 乳化性能, 润湿性能

Abstract:

In this paper, the effect of sodium laurate （SL） on the properties of sodium lauroyl glutamate （SLG）, such as surface activity, foam, wetting, emulsification, and resistance to hard water, has been systematically investigated. The results showed that the critical micelle concentration （cmc） of SLG was 0.30 mmol/L, and the surface tension at the cmc （γ_cmc） was 34.95 mN/m. With the increase of SL content, the efficiency of SLG solution in reducing the surface tension was decreased. When the SL content was increased, there was no significant change in the foaming ability and foam stability of SLG solutions. The increase of SL content improved both the emulsification and wettability of SLG, but reduced its water resistance.

Key words: sodium lauroyl glutamate, sodium laurate, surface activity, emulsification properties, wetting properties

中图分类号:

TQ423

高国芳, 冯亚丹, 刁梓薇, 孙永强, 胡志勇, 朱海林. 月桂酸钠对月桂酰基谷氨酸钠的性能影响[J]. 日用化学工业（中英文）, 2025, 55(4): 446-452.

Guofang Gao, Yadan Feng, Ziwei Diao, Yongqiang Sun, Zhiyong Hu, Hailin Zhu. Effect of sodium laurate on the properties of sodium lauroyl glutamate[J]. China Surfactant Detergent & Cosmetics, 2025, 55(4): 446-452.

图/表 9

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n（SLG）:n（SL）	cmc/（mmol/L）	γ_cmc/（mN/m）	Г_max/（mmol/m²）	A_min/m²	π_cmc/（mN/m）	?G⁰_mic/（kJ/mol）
1:0	0.30	34.95	2.19×10^-3	7.58×10^-22	37.62	-30.06
1:0.2	0.52	34.12	1.74×10^-3	9.77×10^-22	38.79	-28.70
1:0.4	0.63	33.43	1.13×10^-3	1.46×10^-21	39.38	-28.22
1:0.6	0.74	32.88	1.12×10^-3	1.48×10^-21	39.57	-27.83
1:0.8	0.87	32.71	1.04×10^-3	1.59×10^-21	39.86	-27.42
1:1	1.00	32.32	9.93×10^-4	1.67×10^-21	40.40	-27.08
0:1	2.82	26.22	9.84×10^-4	1.69×10^-21	45.50	-24.51

n（SLG）:n（SL）	0 s foam height/mm	30 s foam height/mm	30 s foam stability/%	5 min foam height/mm	5 min foam stability/%
1:0	177	177	100	173	97.7
1:0.2	171	171	100	168	98.2
1:0.4	172	172	100	167	97.1
1:0.6	178	178	100	173	97.2
1:0.8	179	179	100	174	97.2
1:1	177	177	100	171	96.6
0:1	2	2	100	1	50.0

n（SLG）:n（SL）	t/s
1:0	16.09
1:0.2	10.03
1:0.4	9.94
1:0.6	9.67
1:0.8	9.55
1:1	7.97
0:1	88.00

n（SLG）:n（SL）	Group	1	2	3	4	5	Total value	Total score	Average stability	Differential stability
1:0	S1	5	5	5	5	4	24	67	4	$\overline{444}$
	S2	5	5	5	5	4	24
	S3	5	5	5	2	2	19
1:0.2	S1	3	3	3	3	4	16	42	3	$\overline{333}$
	S2	3	3	3	3	1	13
	S3	3	3	3	3	1	13
1:0.4	S1	3	3	3	4	4	17	42	3	$\overline{332}$
	S2	3	3	3	3	1	13
	S3	3	3	3	2	1	12
1:0.6	S1	3	3	3	3	4	16	41	3	$\overline{332}$
	S2	3	3	3	3	1	13
	S3	3	3	3	2	1	12
1:0.8	S1	3	3	3	3	4	16	41	3	$\overline{332}$
	S2	3	3	3	3	1	13
	S3	3	3	3	2	1	12
1:1	S1	3	3	3	4	4	17	40	3	$\overline{332}$
	S2	3	3	3	2	1	12
	S3	3	3	2	2	1	11