月桂酰谷氨酸钠复配体系的泡沫性能研究

doi:10.3969/j.issn.2097-2806.2025.08.010

摘要/Abstract

摘要： 以月桂酰谷氨酸钠（SLG）作为研究对象，采用动态泡沫分析仪对SLG及复配体系的泡沫性能进行研究，分析了复配体系的发泡性能和泡沫稳定性。结果表明，椰油酰甘氨酸钾（PCG）对SLG的泡沫性能有很好的提高作用，表现出良好的协同性。当m（PCG）:m（SLG）=2:8 时最优，其中每平方毫米初始气泡个数（BC_initial）为56.3 mm^-2，约是单一SLG的1.2倍，说明发泡性能明显提高。气泡个数半衰期（t_{BC 1/2}）为434.1 s，约是单一SLG的3.4倍，说明泡沫稳定性显著提升。此外，研究发现复配体系表现出更优异的表面特性，其混合临界胶束浓度（cmc）为0.022 7%，显著低于单一SLG，呈一个数量级减小，表面极限吸附量（Γ_max）明显高于单一SLG。

关键词: 月桂酰谷氨酸钠, 泡沫性能, 氨基酸表面活性剂, 表面极限吸附量

Abstract:

The foam properties of sodium lauroyl glutamate （SLG） and its compounded systems were investigated. The foaming ability and foam stability were measured by using a dynamic foam analyzer. The results showed that potassium cocoyl glycinate （PCG） could significantly enhance the foam properties of SLG due to its synergistic effect with SLG. At the optimum PCG/SLG mass ratio of 2:8, the initial bubble count per square millimeter （BC_initial） was 56.3 mm^-2, which was approximately 1.2 times that of single SLG, and the half-life of bubble count （t_{BC 1/2}） was 434.1 s, which was approximately 3.4 times of single SLG. Furthermore, this compounded system also exhibited excellent surface activity. The critical micelle concentration （cmc） of this surfactant mixture was 0.022 7% and the maximum surface excess （Γ_max） was relatively high. This work could provide important insights into the application of SLG in detergent products.

Key words: sodium lauroyl glutamate, foam property, amino acid surfactant, maximum surface excess

中图分类号:

TQ423

汪哲铖, 郑志辉, 袁旻嘉. 月桂酰谷氨酸钠复配体系的泡沫性能研究[J]. 日用化学工业（中英文）, 2025, 55(8): 1035-1041.

Zhecheng Wang, Zhihui Zheng, Minjia Yuan. Study on the foam properties of mixed systems based on sodium lauroyl glutamate[J]. China Surfactant Detergent & Cosmetics, 2025, 55(8): 1035-1041.

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简称	含义	代表的意义
BC_initial/mm^-2	初始测量时每平方毫米的气泡个数	数值越大说明泡沫越细密，发泡性能越好
t_{BC 1/2}/s	气泡个数减少50%所需要的时间	数值越大说明气泡消亡的速度越慢，泡沫稳定性越好

	50 s	300 s	600 s
SLG
PCG/SLG
SCA/SLG
SMCT/SLG
SLM/SLG
LSA/SLG

	SLG	PCG/SLG	SCA/SLG	SMCT/SLG	SLM/SLG	LSA/SLG
cmc/%	0.378 3	0.035 7	0.095 1	0.091 8	0.256 4	0.280 2
γ_cmc/ （mN/m）	22.67	22.53	22.20	22.65	22.97	22.85

	P1	P2	P3	P4	P5	P6	P7
PCG含量/%	0	1.2	2.4	3.6	6	9.6	12
SLG含量/%	12	10.8	9.6	8.4	6	2.4	0
m（PCG）:m（SLG）	0:10	1:9	2:8	3:7	5:5	8:2	N/A

	m（PCG）:m（SLG）
	0:10	1:9	2:8	3:7	5:5	8:2	10:0
cmc/%	0.378 3	0.035 7	0.022 7	0.029 7	0.032 8	0.032 3	0.030 5
γ_cmc/ （mN/m）	22.67	22.53	22.45	22.3	22.55	22.25	23.42
Γ_max/ （mol/mm²） ×10^-12	1.389 5	1.617 7	1.720 3	1.565 2	1.046 5	1.295 9	1.097 3