pH对脂肪醇醚羧酸盐性能的影响研究

doi:10.3969/j.issn.1001-1803.2022.12.002

摘要/Abstract

摘要：

详细研究了脂肪醇醚羧酸盐（AEC-9Na）在不同质量浓度和不同pH下的平衡表面张力、动态表面张力、吸附动力学、动态接触角、润湿性能、乳化性能和泡沫性能。结果表明，在酸性条件下样品具有更好的表面活性和润湿性能，这都归因于其羧酸头基对pH的高度依赖性。在应用性能方面，碱性条件下，样品表现出良好的泡沫性能，但泡沫稳定性较差，这样的实验结果解释了乳化实验中出现的现象。为其后续的研究和工业应用提供一定的理论支持。

关键词: 脂肪醇醚羧酸盐, pH, 理化性质, 应用性能

Abstract:

The properties of a fatty alcohol ether carboxylate （AEC-9Na） in acidic and alkaline conditions was tested. Its equilibrium surface tension, dynamic surface tension, adsorption kinetics, dynamic contact angle, wetting properties, emulsification properties and foaming properties at different mass concentrations and different pH values were studied. The results show that, the samples have better surface activity and wettability in acidic conditions, which may ascribed to the highly dependence of the ionization of surfactant molecules on pH. In terms of application performance, the samples showed good foamability but poor foam stability in alkaline conditions. In the case of alkaline conditions, the ionization of carboxyl groups was increased and the electrostatic repulsion of ionic headgroups was increased, resulting in more easily broken foams. Such mechanism can also explain the phenomenon observed in emulsification experiments. The present work, indicative of the different behaviors of fatty alcohol ether carboxylates at different pH, may provide some theoretical support for subsequent research and industrial application.

Key words: fatty alcohol ether carboxylate, pH, physicochemical property, application property

中图分类号:

TQ423

孙邦平,张璐,李俊,鞠洪斌,耿涛,姜亚洁. pH对脂肪醇醚羧酸盐性能的影响研究[J]. 日用化学工业（中英文）, 2022, 52(12): 1269-1277.

Sun Bangping,Zhang Lu,Li Jun,Ju Hongbin,Geng Tao,Jiang Yajie. Study on the effects of pH on the properties of a fatty alcohol ether carboxylate[J]. China Surfactant Detergent & Cosmetics, 2022, 52(12): 1269-1277.

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样品	样品质量浓度/（g/L）	测试条件	结果评定（级）
样品	样品质量浓度/（g/L）	测试条件	0.5 h	1.0 h	2.0 h
AEC-9Na	4	a	1	1~2	1~2
		b	1	1~2	1~2
		c	2	2	2~3
	10	a	2	2~3	3
		b	2~3	3	3
		c	2~3	3	3

样品	测试液	结果评定（级）
样品	测试液	0.5 h	1.0 h	2.0 h
AEC-9Na	a	1	1	1
	a	1	1	1
	b	1	1	1
	b	1	1	1
	c	1	1	1
	c	1	1	1
	d	1	1	1
	d	1	1	1

样品	pH	cmc/（g/L）	γ_cmc/（mN/m）	Γ_max/（μmol/m²）	A_min/nm²	pc₂₀
AEC-9Na	1	0.025 4	29.20	3.60	0.46	5.61
	4	0.042 6	28.82	3.83	0.43	5.16
	7	0.100 2	31.89	1.61	1.03	4.69
	10	0.157 7	34.51	1.40	1.19	4.67
	13	0.159 5	35.36	1.35	1.23	4.69

样品	ρ/（g/L）	C	n	lg t^*	t^*/s	R_1/2/（mN/ms）
AEC-9Na	0.001	-1.25	0.10	12.34	2.17×10¹²	9.58×10^-12
	0.01	-1.20	0.35	3.40	2 500.54	0.01
	0.04	-0.95	0.51	1.87	74.34	0.28
	0.1	-0.61	0.49	1.25	17.80	1.17
	0.4	-0.15	0.41	0.36	2.28	9.10
	1.0	0.13	0.32	-0.39	0.41	50.95
	pH	C	n	lg t^*	t^* /s	R_1/2/（mN/ms）
	1	-0.86	0.27	3.22	1 649.86	0.01
	4	-0.63	0.35	1.77	58.67	0.30
	7	-0.41	0.42	0.97	9.39	1.86
	10	0.05	0.41	-0.13	0.75	23.49
	13	0.26	0.29	-0.88	0.13	133.78