Mild high-moisturizing amino acid facial cleanser and preparation method thereof

Abstract

The invention belongs to the technical field of cosmetics, and particularly relates to a mild high-moisture-retention amino acid facial cleanser and a preparation method thereof. The mild high-moisturizing amino acid facial cleanser is prepared from the following raw material components in percentage by mass: 10 to 20 percent of an amino acid surfactant, 5 to 15 percent of a moisturizing agent, 2 to 6 percent of a cyclodextrin derivative, 0.5 to 2 percent of a pearling agent, 0.05 to 0.2 percent of essence, 0.05 to 0.5 percent of a preservative and the balance of water, the cyclodextrin derivative comprises one or two of hydroxypropyl cyclodextrin and fatty alcohol polyoxyethylene ether modified cyclodextrin. According to the invention, the cyclodextrin derivative is combined with the polyhydroxy humectant to thicken and synergistically moisturize the amino acid surfactant, so that the thickening capacity, foaming performance and cleaning capacity of the amino acid facial cleanser can be remarkably improved, and the use skin feeling is remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cosmetics, and particularly relates to a mild and highly moisturizing amino acid facial cleanser and a preparation method thereof. Background Art

[0002] An amino acid facial cleanser is a facial cosmetic with amino acid surfactants as the main cleaning components. Compared with traditional soap-based facial cleansing products, the amino acid facial cleanser is closer to the pH value of the skin and has lower irritation to the skin, which is deeply favored by users with sensitive and dry skin.

[0003] However, the cleaning performance of amino acid surfactants is slightly poor, and other surfactants often need to be compounded to improve the cleaning performance, which reduces the mildness. At the same time, the thickening performance of amino acid surfactants is slightly poor. The conventional improvement method is to use a high molecular polymer thickener such as acrylic polymer for thickening to reach a paste state for convenient use. However, the addition of the high molecular polymer thickener will reduce the foaming performance of the facial cleanser and affect the use experience.

[0004] The invention patent document with the publication number of CN 112957302 A records an amino acid facial cleanser and a preparation method thereof, which mainly consists of the following components and their weight fractions: 7-20 parts of amino acid surfactant, 3-13 parts of auxiliary surfactant, 2-5 parts of thickener, 4-16 parts of moisturizer, 0.5-2 parts of pearlescent agent, and 38.5-80.5 parts of water. By selecting potassium cocoyl glycinate with high safety, mildness and no irritation as the main surfactant, supplemented by coconut oil amide propyl hydroxysulfobetaine and decyl glucoside, it is in the appropriate pH value range of human skin, gently cleans the dirt and excess oil on the face, and the skin is fresh and non-tight after washing. And through the proper proportion addition of acrylic (ester) copolymer and PEG-120 methyl glucose trioleate, a thickening skeleton is formed to ensure the stability of the formula, and at the same time, the influence on the foam performance is minimized as much as possible, giving the formula fine and elastic foam. However, the composition of this facial cleanser is relatively complex and the cost is high. And it still needs to use acrylic (ester) copolymer as a thickener, which has an adverse effect on the foaming performance.

[0005] Therefore, providing a mild and highly moisturizing amino acid facial cleanser with simple ingredients, strong compatibility, low cost, and good cleaning and foaming performances has good market prospects. Summary of the Invention

[0006] The purpose of the present invention is to solve the above-mentioned disadvantages and deficiencies existing in the prior art, and provide a mild and highly moisturizing amino acid facial cleanser and a preparation method thereof.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A mild and highly moisturizing amino acid facial cleanser, comprising the following raw material components by mass percentage:

[0009] Amino acid surfactant 10 - 20%, humectant 5 - 15%, cyclodextrin derivative 2 - 6%, pearlescent agent 0.5 - 2%, essence 0.05 - 0.2%, preservative 0.05 - 0.5%, the balance being water; the cyclodextrin derivative includes one or two of hydroxypropyl cyclodextrin and fatty alcohol polyoxyethylene ether modified cyclodextrin.

[0010] Furthermore, the amino acid surfactant is one or several of cocoyl glutamate, cocoyl glycinate, lauroyl glutamate, myristoyl glutamate, lauroyl sarcosinate.

[0011] Furthermore, the humectant is one or several of glycerol, sodium hyaluronate, propylene glycol, butylene glycol.

[0012] Furthermore, the hydroxypropyl cyclodextrin is a condensation product of cyclodextrin and propylene oxide, and it can be obtained by market purchase.

[0013] Furthermore, the fatty alcohol polyoxyethylene ether modified cyclodextrin is a condensation product of cyclodextrin and fatty alcohol polyoxyethylene ether glycidyl ether, and it is prepared by the following method:

[0014] Add cyclodextrin to an alkaline aqueous solution, heat to 40 - 60 °C and stir to dissolve, then dropwise add an aqueous solution of fatty alcohol polyoxyethylene ether glycidyl ether for holding reaction, after the reaction is completed, add acid for neutralization, concentrate under reduced pressure, add ethanol for precipitation to remove salts, and perform vacuum spray drying to obtain fatty alcohol polyoxyethylene ether modified cyclodextrin.

[0015] Furthermore, the cyclodextrin is β - cyclodextrin; the alkaline aqueous solution is a sodium hydroxide solution with a mass fraction of 5 - 30%.

[0016] Furthermore, the molecular formula of the fatty alcohol polyoxyethylene ether glycidyl ether is C m H 2m+1 O(CH2CH2O) n CH2CH(O)CH2, where m is an integer from 12 to 18 and n is an integer from 6 to 18. It can be obtained by a conventional capping reaction of fatty alcohol polyoxyethylene ether (AEO) and epichlorohydrin.

[0017] Furthermore, the addition amount of the fatty alcohol polyoxyethylene ether glycidyl ether is 50 - 200% of the mass of cyclodextrin, and the substitution degree of the obtained fatty alcohol polyoxyethylene ether modified cyclodextrin is 0.25 - 1.15.

[0018] Furthermore, the holding reaction time is 2 - 6 h.

[0019] The preparation method of the above-mentioned mild high-moisturizing amino acid facial cleanser includes the following preparation steps:

[0020] Add the amino acid surfactant, moisturizer and cyclodextrin derivative to water, heat and stir at 60-80 °C until evenly mixed, then add the pearlescent agent, essence and preservative, and homogenize and emulsify until a uniform phase is obtained. After cooling to room temperature, a mild high-moisturizing amino acid facial cleanser is obtained.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) The present invention uses a cyclodextrin derivative combined with a polyhydroxy moisturizer to thicken the amino acid surfactant by hydrogen bond association and hydrophobic association thickening. Compared with conventional acrylic polymer thickeners, it can reduce the adverse effects on the foaming performance of the amino acid facial cleanser and improve the use experience.

[0023] (2) The present invention uses a cyclodextrin derivative in combination with a moisturizer to further improve the moisturizing effect, reduce skin tightness after cleansing, and improve the use feel.

[0024] (3) The present invention further uses fatty alcohol polyoxyethylene ether modified cyclodextrin as a thickener and a synergistic moisturizer. While having good thickening performance and synergistic moisturizing effect, it can further improve the foaming performance and cleaning ability of the amino acid facial cleanser. Specific embodiments

[0025] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below, but this is not a limitation of the present invention.

[0026] Example 1

[0027] A mild high-moisturizing amino acid facial cleanser, the raw material composition ratio is as follows:

[0028] Sodium cocoyl glutamate 16%, glycerin 6%, butanediol 4%, sodium hyaluronate 1%, hydroxypropyl cyclodextrin (purchased commercially, the condensation product of β-cyclodextrin and propylene oxide) 4%, pearlescent agent ethylene glycol stearate 1%, essence 0.1%, preservative phenoxyethanol 0.1%, and the balance is water.

[0029] The preparation method of the mild high-moisturizing amino acid facial cleanser is as follows:

[0030] Add sodium cocoyl glutamate, glycerin, butanediol, sodium hyaluronate and hydroxypropyl cyclodextrin to an emulsifying pan with hot water at 60-80 °C, stir and mix evenly, then add the pearlescent agent ethylene glycol stearate, essence and preservative phenoxyethanol, and homogenize and emulsify until a uniform phase is obtained. After cooling to room temperature, a mild high-moisturizing amino acid facial cleanser is obtained.

[0031] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value (measured by a pH meter) is 6.2, and the viscosity (measured by a rotational viscometer) is 25640 mPa·s. After the foaming performance test (using the stirring method (Waring-Blender method): Dilute the obtained facial cleanser sample 50 times with deionized water and add it to a measuring cup. Stir at a constant speed for 60 s and then stop stirring. Record the volume of the generated foam), the initial foam volume is 136 ml, and the foam volume after 10 min is 115 ml.

[0032] Example 2

[0033] A mild and highly moisturizing amino acid facial cleanser, the raw material component ratio is as follows:

[0034] Sodium cocoyl glutamate 10%, glycerin 3%, butylene glycol 2%, sodium hyaluronate 0.5%, hydroxypropyl cyclodextrin 6%, pearlescent agent ethylene glycol stearate 0.5%, essence 0.05%, preservative phenoxyethanol 0.2%, the balance is water.

[0035] The preparation method of the mild and highly moisturizing amino acid facial cleanser is the same as that of Example 1.

[0036] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.5, and the viscosity is 32520 mPa·s. After the foaming performance test, the initial foam volume is 105 ml, and the foam volume after 10 min is 90 ml.

[0037] Example 3

[0038] A mild and highly moisturizing amino acid facial cleanser, the raw material component ratio is as follows:

[0039] Sodium cocoyl glutamate 12%, glycerin 4%, butylene glycol 3%, sodium hyaluronate 0.5%, hydroxypropyl cyclodextrin 5%, pearlescent agent ethylene glycol stearate 0.5%, essence 0.05%, preservative phenoxyethanol 0.15%, the balance is water.

[0040] The preparation method of the mild and highly moisturizing amino acid facial cleanser is the same as that of Example 1.

[0041] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.4, and the viscosity is 29600 mPa·s. After the foaming performance test, the initial foam volume is 120 ml, and the foam volume after 10 min is 103 ml.

[0042] Example 4

[0043] A mild and highly moisturizing amino acid facial cleanser, the raw material component ratio is as follows:

[0044] Sodium cocoyl glycinate 14%, glycerin 5%, butanediol 3%, sodium hyaluronate 1%, hydroxypropyl cyclodextrin 4%, pearlescent agent ethylene glycol stearate 1.5%, essence 0.1%, preservative phenoxyethanol 0.1%, the balance is water.

[0045] The preparation method of the mild highly moisturizing amino acid facial cleanser is the same as that of Example 1.

[0046] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.3 and the viscosity is 27880 mPa·s. After the foaming performance test, the initial foam volume is 126 ml and the foam volume after 10 min is 102 ml.

[0047] Example 5

[0048] A mild highly moisturizing amino acid facial cleanser, and the raw material composition ratio is as follows:

[0049] Sodium lauroyl glutamate 16%, glycerin 5%, propylene glycol 4%, sodium hyaluronate 1%, hydroxypropyl cyclodextrin 4%, pearlescent agent ethylene glycol stearate 1.5%, essence 0.1%, preservative phenoxyethanol 0.1%, the balance is water.

[0050] The preparation method of the mild highly moisturizing amino acid facial cleanser is the same as that of Example 1.

[0051] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.2 and the viscosity is 28520 mPa·s. After the foaming performance test, the initial foam volume is 148 ml and the foam volume after 10 min is 128 ml.

[0052] Example 6

[0053] A mild highly moisturizing amino acid facial cleanser, and the raw material composition ratio is as follows:

[0054] Sodium lauroyl sarcosinate 18%, glycerin 6%, propylene glycol 5%, sodium hyaluronate 1%, hydroxypropyl cyclodextrin 3%, pearlescent agent ethylene glycol stearate 1.5%, essence 0.1%, preservative phenoxyethanol 0.1%, the balance is water.

[0055] The preparation method of the mild highly moisturizing amino acid facial cleanser is the same as that of Example 1.

[0056] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.2 and the viscosity is 25280 mPa·s. After the foaming performance test, the initial foam volume is 160 ml and the foam volume after 10 min is 135 ml.

[0057] Example 7

[0058] A mild and highly moisturizing amino acid facial cleanser, and the raw material components are proportioned as follows:

[0059] Sodium myristoyl glutamate 20%, glycerol 8%, butanediol 4%, sodium hyaluronate 2%, hydroxypropyl cyclodextrin 2%, pearlescent agent ethylene glycol stearate 2%, essence 0.2%, preservative phenoxyethanol 0.05%, and the balance is water.

[0060] The preparation method of the mild and highly moisturizing amino acid facial cleanser is the same as that of Example 1.

[0061] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.3 and the viscosity is 22160 mPa·s. After the foaming performance test, the initial foam volume is 152 ml, and the foam volume after 10 min is 132 ml.

[0062] Example 8

[0063] A mild and highly moisturizing amino acid facial cleanser, compared with Example 1, uses fatty alcohol polyoxyethylene ether modified cyclodextrin to replace hydroxypropyl cyclodextrin, and the rest are the same.

[0064] The fatty alcohol polyoxyethylene ether modified cyclodextrin is prepared by the following method:

[0065] Add β-cyclodextrin to an aqueous sodium hydroxide solution with a mass fraction of 20% and heat it to 50 - 55 °C with stirring for dissolution. Then, dropwise add an aqueous solution of the capped product of fatty alcohol polyoxyethylene ether glycidyl ether (AEO-9 (R-O-(CH2CH2O) n H, R = C12, n = 9) and epichlorohydrin) and keep the reaction at a constant temperature for 4 h. The addition amount of fatty alcohol polyoxyethylene ether glycidyl ether to the mass of β-cyclodextrin is 1:1. The degree of substitution of cyclodextrin is tested by titration method to be 0.52. After the reaction is completed, add hydrochloric acid to neutralize to pH 7, concentrate under reduced pressure to about 1 / 2 volume, then add 2 volumes of anhydrous ethanol for precipitation and filter to remove salts, and spray dry the filtrate under vacuum to obtain fatty alcohol polyoxyethylene ether modified cyclodextrin.

[0066] The amino acid facial cleanser obtained in this example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.6 and the viscosity is 23820 mPa·s. After the foaming performance test, the initial foam volume is 208 ml, and the foam volume after 10 min is 180 ml.

[0067] It can be seen from the comparison results of this example and Example 1 that by using fatty alcohol polyoxyethylene ether modified cyclodextrin instead of hydroxypropyl cyclodextrin, the foaming performance of the obtained amino acid facial cleanser can be further significantly improved.

[0068] Comparative Example 1

[0069] An amino acid facial cleanser, compared with Example 1, does not contain hydroxypropyl cyclodextrin, and the rest is the same.

[0070] The amino acid facial cleanser obtained in this comparative example is a milky white pearlescent emulsion. After testing, the pH value is 6.3 and the viscosity is 9640 mPa·s. Through the foaming performance test, the initial foam volume is 145 ml, and the foam volume after 10 min is 110 ml.

[0071] From the comparison results of this comparative example with Example 1 and 8, it can be seen that by adding cyclodextrin derivatives, the viscosity of the amino acid facial cleanser can be significantly increased, and there is no obvious adverse effect on the foaming performance.

[0072] Comparative Example 2

[0073] An amino acid facial cleanser, compared with Example 1, uses 0.45% carbomer thickener to replace hydroxypropyl cyclodextrin, and the rest is the same.

[0074] The amino acid facial cleanser obtained in this comparative example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.1 and the viscosity is 26200 mPa·s. Through the foaming performance test, the initial foam volume is 75 ml, and the foam volume after 10 min is 52 ml.

[0075] From the comparison results of this comparative example with Example 1 and Comparative Example 1, it can be seen that using a conventional acrylic polymer thickener has an obvious adverse effect on the foaming performance of the amino acid facial cleanser.

[0076] Comparative Example 3

[0077] An amino acid facial cleanser, compared with Example 1, uses an equal amount of β-cyclodextrin to replace hydroxypropyl cyclodextrin.

[0078] The amino acid facial cleanser obtained in this comparative example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.3 and the viscosity is 14860 mPa·s. Through the foaming performance test, the initial foam volume is 116 ml, and the foam volume after 10 min is 90 ml.

[0079] From the comparison results of this comparative example with Example 1 and Comparative Example 1, it can be seen that using unmodified cyclodextrin has a certain adverse effect on the foaming performance of the amino acid facial cleanser, and the thickening performance is significantly reduced. The reason is that unmodified cyclodextrin has poor water solubility, and the hydrogen bond association and hydrophobic association with polyhydroxy humectants and amino acid surfactants are reduced.

[0080] Comparative Example 4

[0081] An amino acid facial cleanser, compared with Example 8, uses a compound of 2% β-cyclodextrin and 2% fatty alcohol polyoxyethylene ether (AEO-9) to replace fatty alcohol polyoxyethylene ether modified cyclodextrin.

[0082] The amino acid facial cleanser obtained in this comparative example is a milky white pearlescent viscous emulsion. After testing, the pH value is 6.3 and the viscosity is 15400 mPa·s. After the foaming performance test, the initial foam volume is 166 ml, and the foam volume after 10 minutes is 125 ml.

[0083] From the comparison results of this comparative example with Example 1 and Example 8, it can be seen that the foaming performance of the amino acid facial cleanser can be improved by using the AEO surfactant compound, but the improvement effect is not as good as that of the fatty alcohol polyoxyethylene ether modified cyclodextrin in Example 8. And the compounding of the AEO surfactant has no obvious improvement on the thickening performance.

[0084] Evaluate the cleansing and moisturizing effects of the amino acid facial cleansers obtained in the above Example 1, Example 8 and Comparative Examples 1-4. Select 60 volunteers aged 20-45. Randomly divide the volunteers into 6 groups evenly, with 10 people in each group. Use the above test samples respectively, and evaluate the moisturizing and cleansing effects after cleansing their faces. The moisturizing effect is scored based on the feeling of no dryness and tightness on the face, with a score of 0-5 points. The better the feeling, the higher the score. After statistics, calculate the average value; the cleansing effect is scored based on the feeling of freshness and non-greasiness on the face, with a score of 0-5 points. The better the feeling, the higher the score. After statistics, calculate the average value. The evaluation results are shown in Table 1 below.

[0085] Table 1

[0086]

[0087] From the comparison results of Example 1 and 8 with Comparative Examples 1-3 in Table 1, it can be seen that the present invention can achieve better moisturizing effects by using specific cyclodextrin derivatives in combination with moisturizer components. From the comparison results of Example 8 and Example 1, it can be seen that compared with hydroxypropyl cyclodextrin, using fatty alcohol polyoxyethylene ether modified cyclodextrin can further improve the cleaning ability of the amino acid facial cleanser and has good mildness. From the results of Comparative Example 4, it can be seen that the compounding of the AEO surfactant can achieve good cleaning effects, but it will cause a feeling of dryness and tightness on the face after cleansing, and the mildness and moisturizing effects are reduced.

[0088] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A mild and highly moisturizing amino acid facial cleanser, characterized in that: The raw material components are as follows: The amino acid surfactant is 10-20%, the moisturizer is 5-15%, the cyclodextrin derivative is 2-6%, the pearlescent agent is 0.5-2%, the flavor is 0.05-0.2%, the preservative is 0.05-0.5%, and the balance is water; the cyclodextrin derivative includes one or two of hydroxypropyl cyclodextrin and fatty alcohol polyoxyethylene ether modified cyclodextrin.

2. A mild and highly moisturizing amino acid facial cleanser according to claim 1, characterized in that: The amino acid surfactant is one or more of cocoyl glutamate, cocoyl glycinate, lauroyl glutamate, myristoyl glutamate and lauroyl sarcosinate.

3. A mild and highly moisturizing amino acid facial cleanser according to claim 1, characterized in that: The moisturizing agent is one or more of glycerin, sodium hyaluronate, propylene glycol, and butylene glycol.

4. A mild and highly moisturizing amino acid facial cleanser according to claim 1, characterized in that: The fatty alcohol polyoxyethylene ether modified cyclodextrin is prepared by the following method: Cyclodextrin is added to an alkaline aqueous solution and heated to 40-60°C and stirred to dissolve, then an aqueous solution of fatty alcohol polyoxyethylene ether glycidyl ether is added dropwise and kept warm for reaction, after the reaction is completed, acid is added for neutralization, the reaction is concentrated under reduced pressure, ethanol is added for precipitation and desalination, and vacuum spray drying is performed to obtain fatty alcohol polyoxyethylene ether modified cyclodextrin.

5. A mild and highly moisturizing amino acid facial cleanser according to claim 4, characterized in that: The cyclodextrin is beta-cyclodextrin; the alkaline aqueous solution is a sodium hydroxide solution with a mass fraction of 5 to 30%.

6. A mild and highly moisturizing amino acid facial cleanser according to claim 4, characterized in that: The molecular formula of the fatty alcohol polyoxyethylene ether glycidyl ether is C m H 2m+1 O(CH2CH2O) n CH2CH(O)CH2, m is an integer of 12-18, and n is an integer of 6-18.

7. The mild and highly moisturizing amino acid facial cleanser according to claim 4, characterized in that: The added amount of the fatty alcohol polyoxyethylene ether glycidyl ether is 50-200% of the mass of the cyclodextrin, and the substitution degree of the obtained fatty alcohol polyoxyethylene ether modified cyclodextrin is 0.25-1.

15.

8. The mild and highly moisturizing amino acid facial cleanser according to claim 4, characterized in that: The insulation reaction time is 2 to 6 hours.

9. A method for preparing a mild and highly moisturizing amino acid facial cleanser according to any one of claims 1 to 8, characterized in that: The method comprises the following preparation steps: Amino acid surfactant, moisturizer and cyclodextrin derivative are added into water, heated to 60-80°C, stirred and mixed evenly, then pearlescent agent, fragrance and preservative are added and emulsified to a uniform phase, and cooled to room temperature to obtain a mild and highly moisturizing amino acid cleanser.

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