Composition containing fatty acyl glutamic acid surfactant as well as preparation method and application of composition

Abstract

The invention discloses a composition containing a fatty acyl glutamic acid surfactant as well as a preparation method and application of the composition. The composition comprises water and the following components in percentage by mass: 10%-30% of a surfactant; 2.5%-10% of a thickening agent; the pH is not higher than 5.7; wherein the surfactant comprises a fatty acyl glutamic acid surfactant; the mass ratio of the fatty acyl glutamic acid surfactant in the surfactant is not less than 48%; the thickening agent comprises propylene glycol laurate. The composition can be prepared by simple mixing. The obtained composition can ensure the mildness and has relatively high viscosity at the same time; in practical application, the skin care product is especially suitable for children and sensitive skin.

Description

Technical Field

[0001] This invention relates to a composition containing fatty acylglutamic acid surfactant, its preparation method, and its application. Background Technology

[0002] Currently, the selection of surfactants for personal care products mainly considers two aspects: (1) whether it is environmentally friendly; and (2) whether it is consumer-friendly. Environmental friendliness mainly refers to the fact that the source of the surfactant is green, natural, renewable, and biodegradable, and in line with the trend of sustainable development. Consumer-friendly mainly refers to the fact that the surfactant's performance meets the requirements of being safe and mild, producing rich foam, providing moderate cleaning, easy rinsing, and leaving the skin feeling refreshed and not tight after washing, thus bringing consumers a better washing experience.

[0003] Studies have shown that the micelle shape and size of surfactants in surfactant systems significantly affect their viscosity. When surfactants exist as monomers or spherical micelles, the system viscosity is low; however, when they exist as worm-like micelles, their intertwining forms a three-dimensional network structure, significantly increasing the system viscosity; and when they exist as layered or vesicular structures, the system viscosity decreases. The micelle shape is primarily related to the critical packing parameter C0. p The formula for calculating the critical packing parameter is shown in formula (1):

[0004]

[0005] In the formula: C P A is the critical packing parameter; c The cross-sectional area of ​​the hydrophilic head group at the interface (nm) 2 ); L c V represents the maximum extension length of the hydrophobic group (chain) (nm); V is the volume of the hydrophobic chain (nm). 3 ).

[0006] When C P When ≤1 / 3, it easily forms spherical micelles with low viscosity; when 1 / 3 < C P When ≤1 / 2, it easily forms worm-like micelles with high viscosity; when 1 / 2 < C P When C ≤ 1, it easily forms vesicle structures; when C P When C ≈ 1, it easily forms a layered structure; when C P When the value is greater than 1, it is easy to form an antimicelle structure.

[0007] N-acyl amino acid surfactants are mild, biodegradable surfactants formed by the reaction of amino acids with a single fatty acid or natural fatty acids. Due to their green and natural origin, and unique properties such as good foaming, wetting, rinsing, and biocompatibility, as well as good compatibility with other surfactants, they are currently widely used in the cosmetics, food, and pharmaceutical industries.

[0008] Fatty acyl glutamate surfactants are a type of N-acyl amino acid surfactant. Taking cocoyl glutamate (TEA) salt as an example, its unique molecular structure—possessing two hydrophilic head groups—gives it better solubility, gentleness, and a moisturizing, non-drying feel after washing compared to other amino acid surfactants, making it particularly suitable for children and those with sensitive skin. However, due to its relatively large hydrophilic head groups, cocoyl glutamate TEA salt has a lower critical stacking parameter, easily forming low-viscosity spherical micelles, thus presenting a problem with thickening. Therefore, products containing cocoyl glutamate TEA salt on the market are currently mainly available in the form of shower / facial foams or low-viscosity cleansing creams.

[0009] Therefore, there is an urgent need to develop a washing and care product with excellent overall performance and high viscosity targeting fatty acylglutamic acid surfactants. Summary of the Invention

[0010] To address the issue of existing products containing fatty acylglutamic acid surfactants being difficult to thicken, this invention provides a composition containing fatty acylglutamic acid surfactants, its preparation method, and its applications. Through optimization of the composition formulation, this invention achieves both mildness and high viscosity; in practical applications, it is particularly suitable for children's and sensitive skin care products.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] This invention provides a composition containing a fatty acylglutamic acid surfactant, comprising water and the following components in weight percentage:

[0013] 10%-30% surfactant;

[0014] 2.5%-10% Thickener;

[0015] pH not higher than 5.7;

[0016] in,

[0017] The surfactant includes fatty acylglutamic acid surfactants; the fatty acylglutamic acid surfactant accounts for no less than 48% of the total surfactant by mass.

[0018] The thickener includes propylene glycol lauryl ester.

[0019] In this field, fatty acylglutamic acid surfactants are widely used due to their excellent properties such as mildness, solubility, foaming, wetting, rinsing, and biocompatibility. Theoretically, within a certain range, the higher the amount of this component used in a washing and care product, the better its performance. However, studies have found that when its proportion in the surfactant is too high, conventional formulations (including those using multiple thickeners) cannot guarantee the high viscosity of the resulting product, thus limiting the practical application of this type of surfactant, such as limiting product formulations. This application unexpectedly discovered that when a certain amount of propylene glycol laurate is added to the formulation as a thickener, the viscosity of the resulting composition can be effectively increased without affecting its mildness and other effects.

[0020] In some embodiments, the surfactant content is 10%-20%, for example 14.4%.

[0021] In some embodiments, the fatty acylglutamate surfactant accounts for 48%-60% of the total surfactant mass, for example, 52%.

[0022] In some embodiments, the fatty acylglutamate surfactant is selected from TEA salts of cocoyl glutamate and / or sodium cocoyl glutamate.

[0023] In some embodiments, the content of the fatty acylglutamic acid surfactant is 6%-15%, for example 7.5%.

[0024] In some embodiments, the surfactant further includes an amino acid surfactant. The amino acid surfactant refers to a non-fatty acylglutamate amino acid surfactant.

[0025] In some preferred embodiments, the amino acid surfactant is selected from one or more of sodium methylcocoyl taurate, potassium cocoyl glycinate, sodium cocoyl glycinate, sodium cocoyl aminopropionate, sodium methyl lauroyl taurate, and sodium lauroyl sarcosinate, for example, sodium methylcocoyl taurate.

[0026] In some preferred embodiments, the content of the amino acid surfactant is 1.5%-6%, for example 2.4%.

[0027] In some more preferred embodiments, the mass ratio of the fatty acylglutamic acid surfactant to the amino acid surfactant is 1:(0.1-1), for example 1:0.32.

[0028] In some embodiments, the surfactant further includes an amphoteric surfactant. The amphoteric surfactant may be conventional in the art.

[0029] In some preferred embodiments, the amphoteric surfactant is selected from one or more of sodium lauroamphoacetate, sodium cocoamphoacetate, cocobetaine, cocamidopropyl hydroxysulfonate, cocamidopropyl betaine, and lauroamidopropyl betaine, for example, sodium lauroamphoacetate.

[0030] In some preferred embodiments, the content of the amphoteric surfactant is 3%-6%, for example 4.5%.

[0031] In some embodiments, the thickener further includes one or more of PEG-150 distearate, cocamide MEA, cocamide methyl MEA, cocamide DEA, PEG-120 methyl glucoside, lauryl ether-3, pentaerythritol tetraisostearate, and sodium chloride, preferably one or more of PEG-150 distearate, cocamide MEA, lauryl ether-3, and sodium chloride.

[0032] In some preferred embodiments, the thickener includes propylene glycol laurate and PEG-150 distearate. Studies have found that when propylene glycol laurate is used as one of the thickeners, further compounding with other thickeners can significantly affect the transparency of the resulting composition. However, by using this preferred combination, the transparency of the resulting composition can be further guaranteed, and it can remain stable after being stored at room temperature (25°C) or low temperature (4°C) for a long time.

[0033] The preferred mass ratio of propylene glycol laurate to PEG-150 distearate is (4-8):1, for example, 6:1.

[0034] In some embodiments, the content of the thickener is 2.5%-3.5%, for example, 3%. Studies have found that when the content of the thickener is controlled within this preferred range, the transparency of the resulting composition can be further guaranteed, and it can be stored stably even after being placed at room temperature or low temperature for a long time.

[0035] In some embodiments, the pH of the composition containing fatty acylglutamic acid surfactants is 5.3-5.7, for example 5.4, 5.5, or 5.6. Studies have found that controlling the pH of the composition within this preferred range further ensures the transparency of the resulting composition and allows for stable storage even after prolonged exposure to room temperature or low temperatures.

[0036] In some embodiments, the composition containing fatty acylglutamic acid surfactants further includes a preservative; the preservative and its content can be conventional in the art.

[0037] The preservative is preferably selected from one or more of p-hydroxyacetophenone, capryloyl hydroxamic acid, glyceryl laurate, glyceryl caprylate, ethylhexylglycerin, 1,2-pentanediol, 1,2-hexanediol and butylene glycol, for example, one or more of p-hydroxyacetophenone, capryloyl hydroxamic acid, glyceryl caprylate and butylene glycol.

[0038] The content of the preservative is preferably 0.1%-1%, for example 0.6%.

[0039] In some preferred embodiments, the composition containing fatty acylglutamic acid surfactants comprises the following components in weight percentage:

[0040] The surfactant comprises 6%-15% fatty acyl glutamic acid surfactant, 1.5%-6% amino acid surfactant, 3%-6% amphoteric surfactant, 2.5%-10% thickener and water; the pH is not higher than 5.7; the fatty acyl glutamic acid surfactant accounts for not less than 48% of the total surfactant by mass; the thickener includes propylene glycol laurate.

[0041] In some preferred embodiments, the composition containing fatty acylglutamate surfactant comprises the following components in weight percentage:

[0042] The surfactant comprises 6%-15% fatty acyl glutamate surfactant, 1.5%-6% amino acid surfactant, 3%-6% amphoteric surfactant, 2.5%-3.5% thickener, 0.1%-1% preservative, and water; pH is 5.3-5.7; wherein the fatty acyl glutamate surfactant is selected from TEA salt of cocoyl glutamate and / or sodium cocoyl glutamate, and its mass percentage in the surfactant is 48%-60%; the thickener includes propylene glycol laurate.

[0043] In some specific embodiments, the composition containing fatty acylglutamate surfactants comprises the following components in weight percentage:

[0044] 7.5% TEA-cocoyl glutamate, 2.4% sodium methyl cocoyl taurate, 4.5% sodium lauroyl amphoteric acid, 3% propylene glycol laurate, 0.6% preservatives and water; pH 5.4, 5.5, 5.6 or 5.7.

[0045] In some specific embodiments, the composition containing fatty acylglutamate surfactants comprises the following components in weight percentage:

[0046] 7.5% TEA-cocoyl glutamate, 2.4% sodium methyl cocoyl taurate, 4.5% sodium lauroyl amphoteric acid, 3% propylene glycol laurate, 0.5% PEG-150 distearate, 0.6% preservatives and water; pH 5.5.

[0047] The present invention also provides a method for preparing a composition containing fatty acylglutamic acid surfactants as described above, comprising:

[0048] The components of the composition containing fatty acylglutamic acid surfactant are mixed and the pH is adjusted to obtain the final product.

[0049] In some embodiments, the preparation method includes the following steps:

[0050] S1. Mix the water and surfactant to obtain a first mixture;

[0051] S2. Mix the first mixture and the thickener to obtain a second mixture;

[0052] S3. Adjust the pH of the second mixture to obtain the final product;

[0053] When the composition containing fatty acylglutamic acid surfactant further includes the preservative, step S3 includes the following steps:

[0054] The second mixture is mixed with the preservative, and the pH is adjusted to obtain the final product.

[0055] In some preferred embodiments, in steps S1 and S2, the mixing temperature is independently 80-85°C.

[0056] In some preferred embodiments, in steps S1 and S2, the mixing is carried out independently under stirring conditions.

[0057] In some preferred embodiments, in steps S1 and S2, the mixing is carried out independently under water bath conditions.

[0058] In some preferred embodiments, in step S3, the pH adjuster used for adjusting the pH is selected from one or more of sodium hydroxide, tromethamine, triethanolamine, arginine, citric acid, and sodium citrate, such as citric acid.

[0059] The present invention also provides the application of the composition containing fatty acylglutamic acid surfactant as described above in personal care products.

[0060] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0061] The reagents and raw materials used in this invention are all commercially available.

[0062] The positive and progressive effects of this invention are as follows:

[0063] The composition of the present invention uses fatty acylglutamic acid surfactants as the main cleaning ingredients. With this component accounting for more than 48% of the surfactant, the defect of its difficulty in thickening is improved through formulation optimization without affecting its mildness and other effects. In practical applications, it is especially suitable for children's and sensitive skin care products.

[0064] Furthermore, the present invention also ensures the transparency of the resulting composition through formulation optimization, and it can still be stored stably at room temperature or low temperature for up to 90 days, which can meet the specific needs of transparent washing and care products. Attached Figure Description

[0065] Figure 1 The viscosity comparison results are shown for the compositions containing fatty acylglutamic acid surfactants obtained in Examples 1-2 and Comparative Examples 1-2.

[0066] Figure 2 The viscosity comparison results are for the compositions containing fatty acylglutamic acid surfactants obtained in Examples 1, 3-6 and Comparative Example 3.

[0067] Figure 3 The viscosity comparison results are for the compositions containing fatty acylglutamic acid surfactants obtained in Examples 3, 7-10 and Comparative Example 4. Detailed Implementation

[0068] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0069] The specific information regarding the raw materials used in the following embodiments and comparative examples is as follows:

[0070] TEA salt of cocoyl glutamate, sodium cocoyl glutamate, and sodium methyl cocoyl taurate were purchased from Changsha Puji Biotechnology Co., Ltd.; sodium lauroyl amphoteric acid was purchased from BASF; propylene glycol laurate was purchased from InterMedEsters Sdn. Bhd; cocoamide MEA was purchased from Clariant Chemical Technology (Shanghai) Co., Ltd.; PEG-150 distearate was purchased from Guangzhou Daoming Chemical Co., Ltd.; lauryl ether-3 was purchased from China National Light Industry Chemical Co., Ltd.; NaCl and citric acid were purchased from Sinopharm Chemical Reagent Co., Ltd.; and preservatives (p-hydroxyacetophenone; Nago AB91: a mixture containing butylene glycol, glyceryl caprylate, and capryloyl hydroxamic acid) were purchased from Guangzhou Aizhuo Biotechnology Co., Ltd.

[0071] Example 1

[0072] In this embodiment, the specific information of the composition containing fatty acylglutamic acid surfactants is as follows:

[0073] 1. Raw material formula (by weight percentage)

[0074] Cocoyl glutamic acid TEA salt (30%, by weight) 25%;

[0075] Sodium methyl cocoyl taurate (30%, mass content) 8%;

[0076] Sodium lauroamphoacetate (30%, mass content) 15%;

[0077] 3% propylene glycol laurate;

[0078] Adjust the pH to 5.5 using a pH adjuster;

[0079] Preservative 0.6;

[0080] Deionized water balance.

[0081] The pH adjuster is citric acid; the preservatives are 0.2% p-hydroxyacetophenone, 0.348% butanediol, 0.048% capryloyl hydroxamic acid and 0.004% glyceryl caprylate.

[0082] 2. Preparation method

[0083] (1) Add deionized water, TEA cocoyl glutamate, sodium methyl cocoyl taurate, and sodium lauroyl amphoteric acid to a mixing pot, heat in a water bath to 80-85°C and stir until completely dissolved;

[0084] (2) Add propylene glycol laurate at 80-85℃ and stir until the system is clear and transparent;

[0085] (3) Add p-hydroxyacetophenone at 80-85℃ to dissolve it, then remove it from the water bath and cool it down while stirring. When the temperature drops below 50℃, add Nago AB91 (i.e., a mixture of butanediol, octanoyl hydroxamic acid and glyceryl caprylate) and stir to disperse evenly.

[0086] (3) Add pH adjuster to adjust the pH of the system to 5.5, stir and disperse evenly before discharging.

[0087] Example 2

[0088] Compared to Example 1, the only difference is that the amount of propylene glycol laurate added is 4%.

[0089] Example 3

[0090] Compared to Example 1, the only difference is:

[0091] (1) PEG-150 distearate (as one of the thickeners) was also added at a concentration of 0.5%;

[0092] (2) In step (2) of the preparation method, propylene glycol laurate and PEG-150 distearate are added and stirred until the system is clear and transparent.

[0093] Example 4

[0094] Compared to Example 1, the only difference is:

[0095] (1) Sodium chloride (as one of the thickeners) was also added, and the amount added was 0.5%;

[0096] (2) In step (2) of the preparation method, propylene glycol laurate and sodium chloride are added and stirred until the system is clear and transparent.

[0097] Example 5

[0098] Compared to Example 1, the only difference is:

[0099] (1) Lauryl alcohol polyether-3 (as one of the thickeners) was also added, and the amount added was 0.5%;

[0100] (2) In step (2) of the preparation method, propylene glycol laurate and lauryl alcohol polyether-3 are added and stirred until the system is clear and transparent.

[0101] Example 6

[0102] Compared to Example 1, the only difference is:

[0103] (1) Cocamide MEA (as one of the thickeners) was also added, and the amount added was 0.5%;

[0104] (2) In step (2) of the preparation method, propylene glycol laurate and cocoamide MEA are added and stirred until the system is clear and transparent.

[0105] Example 7

[0106] Compared to Example 3, the only difference is that the pH of the composition is 5.3.

[0107] Example 8

[0108] Compared to Example 3, the only difference is that the pH of the composition is 5.4.

[0109] Example 9

[0110] Compared to Example 3, the only difference is that the pH of the composition is 5.6.

[0111] Example 10

[0112] Compared to Example 3, the only difference is that the pH of the composition is 5.7.

[0113] Comparative Example 1

[0114] Compared to Example 1, the only difference is that propylene glycol laurate was not added.

[0115] Comparative Example 2

[0116] Compared to Example 1, the only difference is that the amount of propylene glycol laurate added is 2%.

[0117] Comparative Example 3

[0118] Compared to Example 1, the only difference is that propylene glycol laurate is replaced with PEG-150 distearate, and the amount added is 0.5%.

[0119] Comparative Example 4

[0120] Compared to Example 3, the only difference is that the pH of the composition is 5.8.

[0121] Effect Example

[0122] The following performance tests were performed on the compositions containing fatty acylglutamic acid surfactants obtained in Examples 1-10 and Comparative Examples 1-4, respectively.

[0123] 1. Viscosity measurement:

[0124] (1) Test method

[0125] The viscosity of each composition was determined using an IKA rotational viscometer. The test conditions were: SP-10 rotor, rotation speed of 30.0 rpm, and test time of 1 min.

[0126] (2) Test results

[0127] The results are shown in Table 1 and , respectively. Figures 1-3 As shown.

[0128] Table 1

[0129]

[0130] From Table 1 and Figures 1-3The results show that, compared with Comparative Examples 1-4, when a certain amount of propylene glycol laurate is added as a thickener and the pH is controlled at 5.3-5.7, even if the proportion of fatty acylglutamic acid surfactants in the surfactant is as high as 48% or more, the viscosity of the obtained composition can still be significantly increased, and all of them are not less than 400 mPa·s; in particular, when propylene glycol laurate and PEG-150 distearate are used as thickeners, they can have a significant synergistic effect on the viscosity of the composition, which can reach as high as 4613 mPa·s.

[0131] According to Figures 1-3 When no thickener was added in Comparative Example 1, the amount of propylene glycol laurate in Comparative Example 2 was too small, PEG-150 distearate was used instead of propylene glycol laurate in Comparative Example 3, and the pH was too high in Comparative Example 4, the viscosity could not be increased and the actual application requirements could not be met.

[0132] 2. Stability test

[0133] The transparency of the compositions containing fatty acylglutamic acid surfactants obtained in Examples 1-10 and Comparative Examples 1-4 was compared after being placed at different temperatures (4°C, 25°C) for a certain period of time (30 days, 60 days, 90 days).

[0134] The results are shown in Tables 2-4. Among them, the compositions containing fatty acylglutamic acid surfactants obtained in Examples 1, 3 and 8-10 consistently remained clear and transparent, which can further meet the specific needs of transparent personal care products.

[0135] Table 2

[0136]

[0137] Table 3

[0138]

[0139] Table 4

[0140]

[0141] 3. Mildness test

[0142] The mildness of the composition containing fatty acylglutamic acid surfactant obtained in Example 3 was tested as follows.

[0143] (1) Test method

[0144] The corneal cell test is a laboratory testing method used internally by cosmetic companies to verify claims of "mildness (non-irritation)". It has advantages such as low cost, ease of mastery, easy determination of toxicity endpoints, good repeatability, high sensitivity, easy standardization, and readily available materials. The composition of Example 3 was diluted 5 times with deionized water (simulating its use), and the irritation was determined using stable fibroblasts derived from rabbit corneal tissue, referring to SN / T 3084 "Eye Irritation Tests for Imported and Exported Cosmetics," Part II: Corneal Cell Test Methods.

[0145] (2) Criteria for determining irritation

[0146] First round of testing: Using PBS (phosphate buffered saline) as the solvent, the corresponding tests were conducted, and the results were judged according to the standards in Table 5.

[0147] Table 5

[0148]

[0149] The second round of testing: DMEM (high sugar culture medium) was used as the solvent to conduct the corresponding tests, and the results were judged according to the standards in Table 6.

[0150] Table 6

[0151]

[0152] (3) Test results:

[0153] As shown in Table 7.

[0154] Table 7

[0155]

[0156] The data in the table show that the cell survival rate was 101.10% when PBS was used as the solvent in Example 3. According to the irritation determination criteria, the test substance can be determined to be a non-irritating / mildly irritating substance with good mildness.

Claims

1. A composition containing a fatty acylglutamic acid surfactant, characterized in that, The composition containing fatty acylglutamic acid surfactants comprises water and the following components in weight percentage: 10%-30% surfactant; 2.5%-10% Thickener; pH not higher than 5.7; in, The surfactant includes fatty acylglutamic acid surfactants; the fatty acylglutamic acid surfactant accounts for no less than 48% of the total surfactant by mass. The thickener includes propylene glycol lauryl ester.

2. The composition containing fatty acylglutamic acid surfactant as described in claim 1, characterized in that, The composition containing fatty acylglutamic acid surfactants satisfies one or more of the following conditions: (1) The thickener also includes one or more of PEG-150 distearate, cocamide MEA, cocamide methyl MEA, cocamide DEA, PEG-120 methyl glucoside, lauryl ether-3, pentaerythritol tetraisostearate and sodium chloride; (2) The content of the thickener is 2.5%-3.5%; (3) The fatty acylglutamic acid surfactant accounts for 48%-60% of the total surfactant by mass. (4) The fatty acyl glutamate surfactant is selected from TEA salt of cocoyl glutamate and / or sodium cocoyl glutamate; (5) The content of the fatty acylglutamic acid surfactant is 6%-15%; (6) The pH of the composition containing fatty acylglutamic acid surfactant is 5.3-5.7; (7) The content of the surfactant is 10%-20%; (8) The surfactants also include amino acid surfactants; (9) The surfactants also include amphoteric surfactants; (10) The composition containing fatty acylglutamic acid surfactants also includes a preservative.

3. The composition containing fatty acylglutamic acid surfactant as described in claim 2, characterized in that, The composition containing fatty acylglutamic acid surfactants satisfies one or more of the following conditions: (1) The thickener includes propylene glycol laurate and PEG-150 distearate; (2) The amino acid surfactant is selected from one or more of sodium methyl cocoyl taurate, potassium cocoyl glycinate, sodium cocoyl glycinate, sodium cocoyl aminopropionate, sodium methyl lauroyl taurate and sodium lauroyl sarcosinate; (3) The content of the amino acid surfactant is 1.5%-6%; (4) The amphoteric surfactant is selected from one or more of sodium lauroylamphoacetate, sodium cocoamphoacetate, cocoyl betaine, cocamidopropyl hydroxysulfonate, cocamidopropyl betaine, and lauroamide propyl betaine; (5) The content of the amphoteric surfactant is 3%-6%; (6) The preservative is selected from one or more of p-hydroxyacetophenone, capryloyl hydroxamic acid, glyceryl laurate, glyceryl caprylate, ethylhexylglycerin, 1,2-pentanediol, 1,2-hexanediol and butanediol; (7) The content of the preservative is 0.1%-1%; (8) The mass ratio of the fatty acylglutamic acid surfactant to the amino acid surfactant is 1:(0.1-1).

4. The composition containing fatty acylglutamic acid surfactant as described in claim 3, characterized in that, The composition containing fatty acylglutamic acid surfactants satisfies one or more of the following conditions: (1) The mass ratio of propylene glycol laurate to PEG-150 distearate is (4-8):1; (2) The amino acid surfactant is sodium methylcocoyl taurate; (3) The amphoteric surfactant is sodium lauroyl amphoteric acetate; (4) The preservative is selected from one or more of p-hydroxyacetophenone, capryloyl hydroxamic acid, glyceryl caprylate and butylene glycol.

5. The composition containing a fatty acylglutamic acid surfactant as described in any one of claims 1-4, characterized in that, The composition containing fatty acylglutamic acid surfactants comprises the following components in weight percentage: The surfactant comprises 6%-15% fatty acyl glutamate surfactant, 1.5%-6% amino acid surfactant, 3%-6% amphoteric surfactant, 2.5%-10% thickener and water; pH not higher than 5.7; the fatty acyl glutamate surfactant accounts for not less than 48% of the total surfactant by mass; the thickener includes propylene glycol laurate.

6. The composition containing fatty acylglutamic acid surfactant as described in claim 5, characterized in that, The composition containing fatty acylglutamic acid surfactants comprises the following components in weight percentage: The surfactant comprises 6%-15% fatty acyl glutamate surfactant, 1.5%-6% amino acid surfactant, 3%-6% amphoteric surfactant, 2.5%-3.5% thickener, 0.1%-1% preservative, and water; pH is 5.3-5.7; wherein the fatty acyl glutamate surfactant is selected from TEA salt of cocoyl glutamate and / or sodium cocoyl glutamate, and its mass percentage in the surfactant is 48%-60%; the thickener includes propylene glycol laurate.

7. The composition containing a fatty acylglutamic acid surfactant as claimed in claim 6, characterized in that the composition containing a fatty acylglutamic acid surfactant comprises the following components in a weight percentage: 7.5% TEA-cocoyl glutamate, 2.4% sodium methyl cocoyl taurate, 4.5% sodium lauroyl amphoteric acid, 3% propylene glycol laurate, 0.6% preservatives and water; pH 5.4, 5.5, 5.6 or 5.7; Alternatively, the composition containing fatty acylglutamic acid surfactants comprises the following components in weight percentage: 7.5% TEA-cocoyl glutamate, 2.4% sodium methyl cocoyl taurate, 4.5% sodium lauroyl amphoteric acid, 3% propylene glycol laurate, 0.5% PEG-150 distearate, 0.6% preservatives and water; pH 5.

5.

8. A method for preparing a composition containing a fatty acylglutamic acid surfactant as described in any one of claims 1-7, characterized in that, The preparation method includes the following steps: The components of the composition containing fatty acylglutamic acid surfactant are mixed and the pH is adjusted to obtain the final product.

9. The method for preparing the composition containing fatty acylglutamic acid surfactant as described in claim 8, characterized in that, The preparation method includes the following steps: S1. Mix the water and surfactant to obtain a first mixture; S2. Mix the first mixture and the thickener to obtain a second mixture; S3. Adjust the pH of the second mixture to obtain the final product; When the composition containing fatty acylglutamic acid surfactant further includes the preservative, step S3 includes the following steps: The second mixture is mixed with the preservative, and the pH is adjusted to obtain the final product.

10. The method for preparing the composition containing fatty acylglutamic acid surfactant as described in claim 9, characterized in that, The preparation method satisfies one or more of the following conditions: (1) In steps S1 and S2, the mixing temperature is independently 80-85℃; (2) In step S3, the pH adjuster used to adjust the pH is selected from one or more of sodium hydroxide, tromethamine, triethanolamine, arginine, citric acid and sodium citrate.

11. The use of a composition containing a fatty acylglutamic acid surfactant as described in any one of claims 1-7 in a personal care product.

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