结晶型氨基酸洁面膏稳定性的条件和机理——多元醇的作用

doi:10.3969/j.issn.1001-1803.2021.05.006

摘要/Abstract

摘要：

研究了4种多元醇（甘油、丁二醇、聚乙二醇400和二丙二醇）对以椰油酰基甘氨酸钾为主表的结晶型洁面膏稳定性的影响及机理。小角度衍射SAXS数据显示,椰油酰基甘氨酸/钾在纯水中可形成层状液晶结构,甘油的加入可使层状液晶结构的层间距增加,使产品微观结构往层间距更宽的层状液晶结构转变。二丙二醇的加入,未发现明显的层间距增加情况。PEG-400的加入,层状液晶结构发生破坏。差示扫描量热法DSC数据结果表明,多元醇的加入可提高产品的结膏温度,对结膏温度的影响依次表现为：丁二醇>甘油>PEG-400>二丙二醇。其中甘油体系中结晶产生的放热峰最干净、尖锐,而丁二醇体系放热峰最平坦不规则,证明了椰油酰基甘氨酸/钾在甘油体系中形成的结晶颗粒最均匀细腻。因此甘油可促进体系形成更加稳定的层状凝胶相与均匀细腻的固体结晶,二者稳定共存,保证了以椰油酰甘氨酸钾为主表的结晶型洁面膏产品的稳定性。

关键词: 椰油酰基甘氨酸钾, 多元醇, 层状液晶, 稳定性

Abstract:

The influences of four polyols （glycerin, 1,3-butylene glycol, PEG-400 and dipropylene glycol） on the stability of crystalline facial cleansing cream based on potassium cocoyl glycinate were investigated. SAXS results displayed lamellar liquid crystal structure of N-cocoyl glycine/potassium N-cocoyl glycinate in aqueous phase. The addition of glycerin increased the interlayer spacing of lamellar, transferring the microstructure towards lamellar liquid crystal structure with broader interlayer spacing. No obvious increasing of the interlayer spacing of lamellar structure was observed with the addition of dipropylene glycol. PEG-400 destroyed the lamellar liquid crystal structure. DSC results revealed that the addition of polyols could elevate the crystallizing temperature. The sequence of impacts was 1,3-butylene glycol>glycerin>PEG-400>dipropylene glycol. In contrast to the rough broad peak of 1,3-butylene glycol system in DSC, the formulation with glycerin showed narrow and clean peak, which indicated that the crystal structure formed with glycerin was uniform and fine. Therefore, glycerin promoted the formation of a more stable layered gel phase and promoted uniform solid crystallization in the system, and the stable coexistence of the two maintained the stability of the crystal-type facial cleansing cream based on potassium cocoyl glycinate.

Key words: potassium N-cocoyl glycinate, polyol, lamellar liquid crystal, stability

中图分类号:

TQ658

汤小芹,陈明华. 结晶型氨基酸洁面膏稳定性的条件和机理——多元醇的作用[J]. 日用化学工业, 2021, 51(5): 408-412.

TANG Xiao-qin,CHEN Ming-hua. Conditions and mechanism for stability of crystalline N-cocoyl glycinate-based facial cleansing cream: Effects of polyols[J]. China Surfactant Detergent & Cosmetics, 2021, 51(5): 408-412.

图/表 8

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参考文献 6

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相	原料名称	w/%
相	原料名称	P-1	P-2	P-3	P-4	P-5
A	去离子水	至100	至100	至100	至100	至100
	EDTA-2Na	0.1	0.1	0.1	0.1	0.1
	柠檬酸	2.8	2.8	2.8	2.8	2.8
B	椰油酰甘氨酸钾	30	30	30	30	30
C	甘油	—	45	—	—	—
	PEG-400	—	—	45	—	—
	二丙二醇	—	—	—	45	—
	丁二醇	—	—	—	—	45

缔合结构		偏光显微镜表征	层间距之比
六角棱形			1：$\frac{1}{\sqrt{3}}$：$\frac{1}{\sqrt{4}}$：$\frac{1}{\sqrt{7}}$
层状			1∶$\frac{1}{2}$∶$\frac{1}{3}$∶$\frac{1}{4}$
反向六角棱形			1：$\frac{1}{\sqrt{3}}$：$\frac{1}{\sqrt{4}}$：$\frac{1}{\sqrt{7}}$

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