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

Abstract

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

CLC Number:

TQ423

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.

Figures/Tables 10

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References 25

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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

Study on the effects of pH on the properties of a fatty alcohol ether carboxylate

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