An amino acid cleansing product and a method for preparing the same

Abstract

The application discloses an amino acid cleansing product and a preparation method thereof. The amino acid cleansing product comprises the following raw material components in percentage by mass: a surfactant composition 10-30%, an amphoteric or non-ionic surfactant 1-10%, citric acid 0.05-0.5%, a humectant 1-5%, 0.5-2% isostearyl alcohol, 0.1-0.5% phytosteryl dimer dilinoleate, 0.5-5% sodium chloride, 0.3-1% inulin lauryl carbamate, and the balance is water; the surfactant composition comprises long-chain fatty acyl glycolate. The amino acid cleansing product of the application maintains uniform appearance under high temperature, low temperature and repeated freezing and thawing conditions, has good physical and chemical stability and compatibility, and at the same time, realizes sufficient cleaning and has less damage to the stratum corneum structure, thereby showing good cleaning and mildness.

Description

TECHNICAL FIELD

[0001] The present application relates to the cosmetic technology field, in particular to an amino acid cleansing product and a preparation method thereof. BACKGROUND

[0002] At present, the cleansing products on the market can be mainly divided into emulsified cleansing products, surfactant type cleansing products, soap-based cleansing products and amino acid type cleansing products according to their main components and cleaning mechanisms. Among them, the amino acid type cleansing product takes amino acid surfactant as the main cleaning component, and its molecular structure is usually weak anion (such as N-acyl amino acid salt) or is compounded with amphoteric ion type amino acid surfactant (such as cocamidopropyl betaine), both of which together form a mild cleaning system, which can maintain the stratum corneum lipid barrier and skin moisture balance to a certain extent. The appearance of the product can be transparent liquid, liquid with pearl luster or slightly milky system, the foam is delicate, and it is suitable for various skin types, especially for sensitive or dry skin.

[0003] However, the existing amino acid type cleansing product still has some deficiencies: on the one hand, although the amino acid surfactant is mild, its decontamination ability is relatively weak, and it may still be insufficient in removing sebum, makeup or environmental pollutants. In order to balance the flowability, skin feel and foam hand feeling, the existing formula usually adds a high molecular thickening agent (such as polyacrylic acid, hydroxypropyl methyl cellulose, etc.) to adjust the viscosity of the system. However, the high molecular thickening agent has obvious defects in the amino acid type system: its molecular chain is long, and it has strong hydration dependence, is easily affected by temperature, pH and ionic strength, and is prone to form gel, flocculation or precipitation under low temperature or cold and hot cycle conditions, resulting in turbidity, stratification or flowability reduction of the product, affecting the appearance and use experience; in addition, the high molecular thickening agent may compete with the amino acid surfactant for water, reduce the foam delicacy, and produce incomplete rinsing or a sticky skin feel, affecting the consumer satisfaction; at the same time, the high molecular thickening agent has strict requirements on the dissolution, hydration and stirring process, increasing the complexity of the formula and the production cost.

[0004] In summary, the amino acid type cleansing product still has limitations in cleaning power, skin mildness and system stability, and there is an urgent need for an improved amino acid cleansing product that can balance mild cleaning, good foam hand feeling and low temperature stability. SUMMARY

[0005] In view of the problems of low temperature gelation, poor flowability and difficulty in balancing cleaning power and mildness of the amino acid cleansing product in the prior art, the present application provides an amino acid cleansing product and a preparation method thereof.

[0006] The present application provides an amino acid cleansing product, which comprises the following raw material components in terms of mass percentage:

[0007] Surfactant composition 10-30%, amphoteric or nonionic surfactant 1-10%, citric acid 0.05-0.5%, humectant 1-5%, 0.5-2% isostearyl alcohol, 0.1-0.5% phytosteryl dimer dilinoleate, 0.5-5% sodium chloride, 0.3-1% inulin lauryl carbamate, and the balance being water;

[0008] The surfactant composition comprises long-chain fatty acyl glycolate.

[0009] The present application forms a system with multiple synergistic effects. The sterol ester and isostearyl alcohol synergistically form a lamellar liquid crystal structure, which can effectively stabilize surfactant micelles and reduce interfacial tension, thereby improving the stability and mildness of the system. At the same time, inulin lauryl carbamate forms a weak three-dimensional hydrogen bond network in the lamellar liquid crystal structure, which plays a role in flexible thickening and foam stabilization. Unlike traditional thickening methods that rely on rigid gel structures, the system has both flowability and structural stability.

[0010] In the present application, isostearyl alcohol can weaken the excessive association between surfactant molecules, thereby significantly inhibiting low-temperature gelation and maintaining the flowability of the formulation. Phytosteryl dimer dilinoleate can form a "flexible interfacial film" by Van der Waals interaction with the hydrophobic segment of the fatty acyl amido acid salt on one end and providing flowability and sebum similarity with the double bond of linoleic acid on the other end. Inulin lauryl carbamate has a mild rheological control ability in the hydrogel phase, which can improve the viscoelastic stability of the system, prevent gelation, and form a "saccharide moisturizing film" on the skin surface, thereby improving the smoothness and moisturizing durability of the skin after use.

[0011] In some embodiments, the mass ratio of isostearyl alcohol to phytosteryl dimer dilinoleate is 1: (0.1-0.3), which can achieve the best balance between inhibiting gelation, improving system stability, and improving skin feel.

[0012] In some embodiments, the long-chain fatty acyl glycolate is any one of lauroyl glycolate, myristoyl glycolate, or cocoyl glycolate; preferably sodium cocoyl glycolate.

[0013] In some embodiments, the surfactant composition further comprises an amino acid surfactant.

[0014] In some embodiments, the amino acid surfactant is any one or more of sodium lauroyl aspartate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, sodium cocoyl glycinate, potassium cocoyl glycinate, sodium lauroyl glutamate, disodium lauroyl glutamate, sodium cocoyl glutamate, or disodium cocoyl glutamate.

[0015] In some embodiments, the humectant is any one or more of glycerin or hydroxyethyl urea; preferably glycerin.

[0016] In some embodiments, the amphoteric or nonionic surfactant is any one or more of lauryl glucoside, sodium cocoamphoacetate, capryl amido propyl betaine or decyl amido propyl betaine; preferably lauryl glucoside.

[0017] In some embodiments, the amino acid cleansing product has a pH of 4.6-6.0. Controlling the pH in the range of 4.5-6.0 ensures stability and facilitates film formation.

[0018] In some embodiments, the amino acid cleansing product has a viscosity of 3000-30000 mPa·s.

[0019] In some embodiments, the amino acid cleansing product is a cleansing milk or a cleansing cream.

[0020] The present application also provides a preparation method of the amino acid cleansing product, comprising the following steps:

[0021] (1) The surfactant composition, amphoteric or nonionic surfactant, humectant, and citric acid are weighed according to the mass percentage to obtain solution 1;

[0022] (2) Isostearyl alcohol and phytosteryl dimer dilinoleate are weighed according to the mass percentage, heated and dissolved at 70-80°C to obtain solution 2;

[0023] (3) The solution 2 is added to the solution 1 under stirring, the system temperature is maintained at 50-60°C, and the stirring is continued until a uniform emulsion system is formed;

[0024] (4) When the system temperature drops to 35-45°C, inulin lauryl carbamate is added, and the stirring is continued for 10-20 min to obtain the amino acid cleansing product.

[0025] In some embodiments, the alkali solution is a sodium hydroxide solution or a potassium hydroxide solution with a mass fraction of 8%-12%.

[0026] In some embodiments, the reaction step is carried out under nitrogen protection, and the nanofiltration membrane has a pore size of 0.1-0.5 μm.

[0027] In some embodiments, the preparation method of the long-chain fatty acyl glycolate comprises the following steps:

[0028] (1) In a reaction vessel with stirring device and acid gas absorption device, long-chain fatty acid chloride and glycolic acid are added, and the molar ratio of the long-chain fatty acid chloride to the glycolic acid is (0.8-1.2):1;

[0029] (2) heating to 60~75℃ under oil bath condition, stirring and reacting for 1~3 h until the long-chain fatty acyl chloride reaction is complete;

[0030] (3) after the reaction liquid is cooled to room temperature, deionized water is added for dilution, and lye is added to adjust the pH to 8.0~9.5;

[0031] (4) continue to add deionized water to adjust the solid content to 15%~25%, and remove the insoluble substances by filtration;

[0032] (5) the filtrate is subjected to nanofiltration or dialysis to remove inorganic salts and unreacted raw materials, to obtain the long-chain fatty acyl glycolate.

[0033] In summary, compared with the prior art, the present application achieves the following technical effects:

[0034] 1、The amino acid cleansing product of the present application maintains uniform appearance under high temperature, low temperature and repeated freeze-thaw conditions, and has good physical and chemical stability and compatibility.

[0035] 2、The amino acid cleansing product of the present application can restore the skin barrier in a short time after cleaning, and no obvious irritation reaction occurs. Long-term use by volunteers has verified that there is no discomfort such as erythema, dryness or tightness, and it is suitable for people with sensitive skin.

[0036] 3、The amino acid cleansing product of the present application has rich and delicate and stable foam, is easy to rinse and does not leave residues. After cleaning, the skin surface is smooth and delicate, the moisturizing degree is improved, and the overall skin feel is refreshing and not greasy.

[0037] 4、The amino acid cleansing product of the present application can efficiently remove sebum, makeup and external dirt, while causing less damage to the stratum corneum structure under the condition of achieving sufficient cleaning, and exhibits good cleaning and mildness. DETAILED DESCRIPTION

[0038] In order to enable the personnel in the technical field to better understand the present application, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the personnel in the field without creative labor should belong to the scope of protection of the present application.

[0039] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the materials, reagents, etc. used can be obtained from commercial channels.

[0040] Source of raw materials:

[0041] Cocoyl chloride: Liyan Chemical.

[0042] Lauryl glucoside: Weilun Chemical.

[0043] Sodium lauroyl sarcosinate: Guangzhou Baifu Run Chemical Co., Ltd.

[0044] Citric acid: Jinan Chuangshi Chemical Co., Ltd.

[0045] Moisturizer: Glycerin, commercially available.

[0046] Isostearyl alcohol: CAS No. 27458-93-1, Rongsheng New Material.

[0047] Phytosteryl dimer dilinoleate: B30231, Shanghai Yuan Ye Bio.

[0048] Sodium chloride: commercially available.

[0049] Inulin lauryl carbamate: Wuhan Lanna Bai.

[0050] Phenoxyethanol: Hubei Weideli.

[0051] Hydroxypropyl methyl cellulose: Shanghai Kanglang Bio.

[0052] Lavender fragrance: commercially available.

[0053] The preparation method of sodium cocoyl glutamate used in the present application is as follows:

[0054] In a four-necked flask, 958.8 g of cocoyl chloride (4.38 mol) and 400 g of glutamic acid (5.26 mol) were added, and an acid gas absorption device was connected. The temperature of the system was raised to 65-70°C in an oil bath, and stirring was carried out while the temperature was raised. The reaction was carried out for 2 h until the cocoyl chloride was completely reacted. After the reaction was completed, 2500 g of deionized water was added to the solution at room temperature, and stirring was carried out until the solution was homogeneous. 2787 g of 10% sodium hydroxide solution (mass fraction) was added to adjust the pH value to 8.5-9.0, and then 660 g of deionized water was added to adjust the solid content of the solution to 16%-18%. The precipitate was removed by passing through a 0.45 micron filter membrane, and finally the solution was subjected to nanofiltration membrane to remove inorganic salts and sodium glutamate. The solid content of the solution was adjusted to 25%, and sodium cocoyl glutamate was obtained.

[0055] The amino acid cleansing product provided by the embodiments of the present application has the components (mass percentage) shown in Table 1.

[0056] Table 1 Components of the amino acid cleansing products of Examples 1-6 (%)

[0057]

[0058] The preparation method of the amino acid cleansing products of Examples 1-6 includes the following steps:

[0059] (1) Sodium cocoyl glutamate, lauryl glucoside, glycerin, citric acid, (and sodium lauroyl sarcosinate) were weighed according to the mass percentage content to obtain solution 1;

[0060] (2) Isostearyl alcohol, phytosteryl dimerdilinoieate were weighed according to the mass percentage content and heated to melt at 70-80°C to obtain solution 2;

[0061] (3) The solution 2 was added to the solution 1 under the condition of stirring speed 600 rpm, the system temperature was maintained at 50±2°C, the pH was adjusted to 5.5, and the stirring was continued until a uniform emulsion system was formed;

[0062] (4) When the system temperature dropped to 40°C, inulin lauryl carbamate was added, and the stirring was continued for 10-20 min to obtain the amino acid cleansing product.

[0063] Example 7

[0064] On the basis of Example 1, 0.5% phenoxyethanol and 0.001% lavender fragrance were added.

[0065] Comparative Example 1

[0066] The difference between this comparative example and Example 1 is that the amount of sodium cocoyl glutamate is reduced to 5%.

[0067] Comparative Example 2

[0068] The difference between this comparative example and Example 1 is that the amount of sodium cocoyl glutamate is increased to 40%.

[0069] Comparative Example 3

[0070] The difference between this comparative example and Example 1 is that isostearyl alcohol is not added.

[0071] Comparative Example 4

[0072] The difference between this comparative example and Example 1 is that the amount of isostearyl alcohol is increased to 5%.

[0073] Comparative Example 5

[0074] The difference between this comparative example and Example 1 is that phytosteryl dimerdilinoieate is not added.

[0075] Comparative Example 6

[0076] The difference between this comparative example and Example 1 is that the amount of phytosteryl dimerdilinoieate is increased to 1%.

[0077] Comparative Example 7

[0078] The comparative example differs from Example 1 in that inulin lauryl carbamate is not added.

[0079] Comparative Example 8

[0080] The comparative example differs from Example 1 in that inulin lauryl carbamate is replaced by hydroxypropyl methyl cellulose.

[0081] Test Example 1 System stability and low temperature anti-gelling test

[0082] This test example verifies the gelling, delamination or turbidity of Examples 1-7 and Comparative Examples 1-8 under low temperature, freeze-thaw cycle, accelerated aging (high temperature).

[0083] (1) Low temperature storage observation (4°C)

[0084] Each group of samples was divided into transparent test tubes (50 mL) and stored in a 4±2°C refrigerator for 7 days, 14 days and 30 days. The test period was 7 days, 14 days and 30 days, respectively, to observe the appearance and record whether there was delamination, turbidity, crystallization or gelling. At the same time, the transmittance at 500 nm was measured at 25°C using a spectrophotometer to quantitatively evaluate the transparency.

[0085] Acceptance criteria: the transmittance of the sample remains above 70% after 30 days of storage, which is considered to be a stable system.

[0086] The transmittance was measured using a spectrophotometer at 25°C to measure the transmittance at 500 nm.

[0087] Table 2 Low temperature storage observation results (n=3)

[0088]

[0089] The samples of Examples 1-7 all maintained a stable appearance of milky white, and the transmittance remained at a high level (above 70%), showing good low temperature stability. Comparative Example 1 showed slight turbidity, but still maintained stability, with a transmittance of above 74%, meeting the acceptance criteria for low temperature storage. The samples in Comparative Examples 2, 3, 4, 5, 7 and 8 showed obvious turbidity, gelling, delamination or precipitation during low temperature storage, failing to meet the stability requirements, indicating that these formulations have significant stability problems in actual application.

[0090] (2) Freeze-thaw cycle (-5°C, 25°C)

[0091] The samples were placed at -5°C for 24 h, then transferred to 25°C for another 24 h, which was considered as one cycle, and a total of 3 cycles were performed. The appearance change and viscosity change of the samples were recorded during the test.

[0092] Viscosity was measured using a Brookfield rotational viscometer at 25°C.

[0093] The acceptance criteria were that the sample had no irreversible gelation, delamination or precipitation after freeze-thaw cycles, and the viscosity change was no more than ± 25%. The results are shown in Table 3.

[0094] (3) Accelerated aging test (high temperature)

[0095] The samples were placed in a 45°C incubator for 14 days, and samples were taken at 0 days, 7 days and 14 days for determination of appearance, pH value and viscosity change. The pH value was measured using a pH meter, and the viscosity was measured using a Brookfield rotational viscometer (25°C).

[0096] The acceptance criteria were that the sample had no irreversible gelation, delamination or precipitation after freeze-thaw cycles, and the viscosity change was no more than ± 25%. The results are shown in Table 3.

[0097] Table 3 Freeze-thaw cycle and accelerated aging test results (n = 3)

[0098]

[0099] From the above table results, the samples of Examples 1-7 of the present application did not have irreversible gelation or phase separation during the freeze-thaw cycle, the appearance was maintained as milky white or milky, and the viscosity change was within ± 25%, meeting the freeze-thaw stability requirements. This shows that the amino acid cleansing product of the present application can maintain excellent stability under freeze-thaw conditions, meeting the temperature fluctuation requirements in daily use. The formulations of Comparative Examples 2, 3, 4, 5, 7 and 8 had different degrees of stability problems after freeze-thaw cycles, such as gelation, turbidity or delamination, and the viscosity change was more than ± 25%, failing to meet the freeze-thaw stability requirements. This shows that excessive sodium cocoglycinate or improper proportions of auxiliary ingredients can affect the freeze-thaw stability of the product, resulting in a decrease in the performance of the formulation.

[0100] In the accelerated aging test, Examples 1-7 had no significant change in appearance after being stored at 45°C for 14 days, the pH value drift was less than 0.3, and the viscosity change was within ± 30%, indicating that these samples showed good stability in the accelerated aging test. The formulations of Comparative Examples 2, 3, 4, 5, 7 and 8 failed to meet the accelerated aging stability requirements, especially in terms of pH value drift and viscosity change. This shows that improper ingredient ratio or lack of certain stability enhancing ingredients can cause the stability of the product to decrease in a high temperature environment.

[0101] Test Example 2 Foam performance and foam fineness

[0102] This test example is used to evaluate the foam formation, foam fineness and foam stability of the samples of Examples 1-7 and Comparative Examples 1-8.

[0103] The sample was prepared into a hard water solution with a mass concentration of 3% (hard water conductivity 208 μS / cm), and a certain amount of sample was placed into a Kriuger foam instrument to generate foam by stirring. The average particle size, number, foam height and height decay of the foam were monitored in real time by an optical sensor, and the obtained images were quantitatively analyzed by using a foam analysis software. The initial particle size (measured immediately after generation), the final particle size (when stirring for 5 min), the maximum foam volume and the half-life (tBc1 / 2) of the foam were recorded.

[0104] The total test time was 5 min to simulate the foaming and cleaning process during actual cleansing (usually lasting for 2-3 min, not more than 5 min). When the number of bubbles did not decrease by 50% within 5 min, the half-life was recorded as "none". The results obtained are shown in the following table;

[0105] Table 4 Foam performance and foam fineness test results (n = 3)

[0106]

[0107] Examples 1 to 7 all showed a high maximum foam volume, and the initial particle size and the final particle size were close, indicating that the foam was fine and durable. The number of bubbles of all samples did not decrease by more than 50% within 5 min, showing that the foam was relatively stable and suitable for long-term use during the cleaning process.

[0108] Comparative Example 1 and Comparative Example 6 showed relatively poor foam performance, although the maximum foam volume remained at a high level, but the foam particle size was slightly larger, and the half-life was longer, indicating that the foam was relatively coarse and had poor durability. Comparative Example 2 and Comparative Example 3 showed a small maximum foam volume in the foam performance test, and the foam particle size was large, the initial particle size was more than 55 μm, and the final particle size also increased. The half-life was short, indicating that the foam decayed rapidly, and the cleaning effect and user experience were poor. Comparative Example 4 and Comparative Example 5 showed poor foam stability, the initial particle size of the foam was large, and the maximum foam volume was small, indicating that the foam quality and durability were poor, and the fineness and stability of the foam could not be effectively maintained. Comparative Example 7 and Comparative Example 8 showed poor foam performance, the maximum foam volume was the lowest, the foam particle size was large, and the half-life was short. The final foam disappeared quickly, indicating that the foam was unstable, which affected the cleaning effect.

[0109] Test Example 3 Cleaning power and mildness

[0110] (1) Sebum removal amount test and transepidermal water loss (TEWL) recovery test

[0111] Forty-five healthy volunteers (half male and half female) were selected to perform the test on the inner forearm skin. First, an equal amount of artificial sebum (formulation containing mineral oil, fatty acid ester and cholesterol) was evenly applied on the test area. After drying, the sample of Example and the sample of Comparative Example were used to clean for 30 s and rinsed with warm water respectively. The sebum content was measured by Sebumeter SM815 before and after cleaning, and the sebum removal rate was calculated. Then the sample of Example and the sample of Comparative Example were used to clean for 1 min and rinsed, and the Trans Epidermal Water Loss (TEWL) value was measured by Tewameter TM300 instrument before cleaning, immediately after cleaning and 1 h after cleaning.

[0112] The results are shown in Table 5.

[0113] Table 5 Results of sebum removal rate and TEWL change

[0114]

[0115] The results of Table 5 show that Examples 1-7 exhibit a high sebum removal effect in the sebum removal test, with a removal amount of 85-90%, indicating that these samples have strong cleaning power when cleaning sebum. In comparison, Comparative Example 1 shows a removal amount of 78%, which is lower than Example 1, but still achieves a moderate cleaning effect. Comparative Example 2 performs well in sebum removal, with a removal amount of 93%, which is higher than other samples, showing strong cleaning power. The sebum removal effects of Comparative Examples 3 and 4 are 80% and 83% respectively, which belong to moderate cleaning power and are relatively mild, but do not reach the cleaning power of the Examples. Comparative Example 5 is slightly insufficient in sebum removal, with a removal amount of 75%, and the cleaning power is relatively weak. Comparative Examples 7 and 8 have sebum removal effects of 70% and 68% respectively, which are the lowest among all samples, and the cleaning power is weak, making it difficult to completely remove sebum and dirt on the skin.

[0116] The transepidermal water loss (TEWL) recovery test results show that the samples of Examples 1-7 can effectively protect the skin moisture barrier, and the TEWL recovery time after cleaning is shorter, which proves the excellent performance of the formula of the present application in terms of mildness and protection of skin hydration. Comparative Example 2 and Comparative Example 3 show slower recovery time. The hydration of Comparative Example 1, Comparative Example 5 and Comparative Example 7 also shows weaker performance, with longer recovery time, indicating that these formulas have poor skin barrier protection effect. Comparative Example 8 performs the worst, with poor skin hydration after cleaning and longer recovery time, indicating that this formula may not be suitable for daily use that requires protection of skin moisture. In summary, the samples of Examples 1-7 can effectively protect the skin barrier and reduce water loss while cleaning, showing a good balance between mildness and cleaning power. In contrast, the comparative samples show poor performance in terms of hydration, especially the samples with high concentration of cleaning ingredients, which can cause dryness and discomfort of the skin.

[0117] (3) Skin subjective feeling

[0118] Thirty volunteers were recruited to score the skin feeling before and after using the facial cleanser from 0 to 5, and the evaluation indexes were:

[0119] ① The size of skin residue after washing (0 for no residue, 5 for severe residue);

[0120] ② Whether there is irritation;

[0121] ③ Whether it is tight and dry after washing;

[0122] ④ The moisturizing degree after washing;

[0123] ⑤ The willingness of daily use.

[0124] Table 6 Skin subjective feeling score

[0125]

[0126] The results of Table 6 show that Examples 1-7 all show relatively mild subjective scores. Especially in the scores of "moisturizing degree after washing" and "whether it is tight and dry", the average scores are all 3 points or more, indicating that these formulas perform well in terms of skin feeling after washing, and can maintain the moisturizing feeling and comfort of the skin while cleaning. That is, Examples 1-7 achieve a good balance between skin comfort, cleaning power and mildness, and can provide a more pleasant cleansing experience.

[0127] In comparison, Comparative Example 1 and Comparative Example 5 showed lower scores in both the "after-washing residual feeling" and "tight dry feeling" scores, indicating that the skin after cleaning with these two formulations can have a more obvious tightness or discomfort, and lower moisturizing feeling, and lower willingness to use in daily life. Comparative Example 2 showed lower skin moisturizing feeling, stronger tightness, and relatively higher after-washing residual feeling, indicating that too strong detergency can burden the skin and affect the use experience. Although Comparative Example 3 and Comparative Example 4 had lower after-washing residual feeling, due to the poor moisturizing feeling, the use experience of these formulations was not as good as the example group. Comparative Example 7 and Comparative Example 8 had higher after-washing residual feeling and lower moisturizing feeling, and also had a slight irritation feeling. This indicated that these two formulations had obvious deficiencies in the comfort and moisturizing feeling after cleaning, and the use experience was poor. It was indicated that the comparative examples had different degrees of discomfort for use, and were not suitable for long-term or frequent use.

[0128] The above description is merely preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An amino acid facial cleanser, characterized in that, Includes the following raw material components by mass percentage: The composition includes 10-30% surfactant, 1-10% amphoteric or nonionic surfactant, 0.05-0.5% citric acid, 1-5% humectant, 0.5-2% isostearyl alcohol, 0.1-0.5% phytosterol dimer linoleate, 0.5-5% sodium chloride, 0.3-1% inulin lauryl carbamate, and the balance being water. The surfactant composition includes long-chain fatty acyl glycolate; The long-chain fatty acyl glycolate is any one of lauroyl glycolate, myristoyl glycolate, or cocoyl glycolate; The preparation method of the long-chain fatty acyl glycolate includes the following steps: (1) In a reaction vessel equipped with a stirring device and an acid gas absorption device, long-chain fatty acyl chloride and glycolic acid are added, wherein the molar ratio of long-chain fatty acyl chloride to glycolic acid is (0.8~1.2):1; (2) Heat to 60-75°C in an oil bath and react with stirring for 1-3 h until the long-chain fatty acyl chlorides are completely reacted; (3) After cooling the reaction solution to room temperature, dilute it with deionized water and adjust the pH to 8.0~9.5 with alkali solution; (4) Continue to add deionized water to adjust the solid content to 15%~25%, and filter to remove insoluble matter; (5) The filtrate is subjected to nanofiltration or dialysis to remove inorganic salts and unreacted raw materials to obtain the long-chain fatty acyl glycolate; The surfactant composition further includes an amino acid surfactant; The amphoteric or nonionic surfactant is any one or more of lauryl glucoside, sodium cocoamphoacetate, octanoylaminopropyl betaine, or decanoylaminopropyl betaine.

2. The amino acid facial cleanser according to claim 1, characterized in that, The mass ratio of isostearyl alcohol to phytosterol dimer linoleate is 1:(0.1~0.3).

3. The amino acid facial cleanser according to claim 1, characterized in that, The amino acid surfactant is any one or more of sodium lauroyl aspartate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, sodium cocoyl glycinate, potassium cocoyl glycinate, sodium lauroyl glutamate, disodium lauroyl glutamate, sodium cocoyl glutamate, or disodium cocoyl glutamate.

4. The amino acid facial cleanser according to claim 1, characterized in that, The moisturizer is any one or more of glycerin or hydroxyethyl urea.

5. The amino acid facial cleanser according to claim 1, characterized in that, The pH of the amino acid facial cleanser is 4.6~6.

0.

6. The amino acid facial cleanser according to claim 1, characterized in that, The amino acid facial cleanser is a facial cleanser milk or facial cleanser cream.

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