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

Abstract

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

CLC Number:

TQ423

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.

Figures/Tables 9

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Tab. 1

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References 22

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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

Effect of sodium laurate on the properties of sodium lauroyl glutamate

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