Amino acid face cleaning composition and preparation method thereof

Abstract

The invention discloses an amino acid face cleaning composition and a preparation method thereof, the amino acid face cleaning composition comprises the following raw materials by weight: 50-60 parts of corn starch, 15-25 parts of mannitol, 15-20 parts of a composite surfactant, 8-12 parts of modified carbon black, 1-1.5 parts of a composite plant root extract, 0.5-1 part of an osmanthus flower extract, 0.2-0.3 part of sodium benzoate, 0.2-0.3 part of allantoin, and 0.5-0.8 part of a trace component. According to the amino acid cleansing composition, the composite surfactant system, the modified carbon black and the plant extract are synergistically compounded in a matrix formed by the corn starch and the mannitol, so that the potential irritation of the formula of the prepared amino acid cleansing composition is reduced from the source, and the washability of the product is remarkably improved through the modified carbon black; and residues are reduced, so that multiple effects of cleaning, mildness, easiness in washing, few residues, soothing, repairing and the like of the amino acid cleansing composition are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of skin care products, and particularly relates to an amino acid facial cleansing composition and a preparation method thereof. Background Art

[0002] The skin is one of the important organs of the human body and an important symbol of human health and beauty. The surface of the human skin is covered by sebum secreted by sebaceous glands, forming a natural protective film that makes the skin surface soft and smooth. However, due to the daily facial sweat stains, dust and other contaminants on the human body, various skin conditions are brought about. The dirt on the skin surface consists of two parts. One part comes from ourselves, such as oils, sweat, exfoliated keratinocytes and mucosal epithelial cells, microorganisms, etc.; the other part comes from the outside, such as air dust, makeup residues, etc.; these dirt and their metabolites are unstable and can react with oxygen in the air or deposited molecules. When exposed to sunlight or in the presence of bacteria on the skin, various physical, chemical and biochemical reactions occur, forming some irritating substances that may damage the skin. Therefore, skin cleansing is particularly important. Removing facial dirt allows the skin to breathe smoothly, making facial cleansing a cleaning product with a very high daily usage frequency among consumers.

[0003] The main cleanser in facial cleansing products is a surfactant. Although the contact time between the surfactant and the human skin is short, the surfactant's penetration effect on the skin, its interaction with intercellular lipids leading to a decrease in lipids or a change in the composition ratio, as well as its binding to proteins, swelling, and denaturation, these series of negative effects will not only affect the barrier function of the stratum corneum, but also affect the growth and differentiation regulation of keratinocytes, thereby affecting the formation of a healthy stratum corneum, damaging the skin barrier, and causing irritation. Amino acid facial cleansing products are characterized by high mildness, a weak acidic pH value close to that of the human skin, dense and rich foam, excellent skin feel experience, etc. However, amino acid facial cleansing products mostly focus on cleansing and are insufficient in terms of additional skin care effects such as moisturizing, repair, and anti-aging.

[0004] Chinese Patent Application CN106726698A discloses an amino acid-based facial cleanser, the raw materials of which include: 10-30wt% amino acid surfactant, 0.5-2wt% thickener, 0.2-2.5wt% neutralizer, 0.1-1wt% conditioner and deionized water. The amino acid-based facial cleanser provided by this invention is neutral, mild and skin-friendly, safe and non-irritating, does not increase the burden on the skin, can deeply clean the skin, and the skin quickly restores the oil-water balance and pH balance after cleansing. It is suitable for any skin type and can be used for a long time. The product has a lotion texture, excellent appearance and moisturizing property, and excellent high and low temperature stability, with a certain consistency, which can meet a good user experience. However, this amino acid-based facial cleanser only has the functions of cleaning and moisturizing, does not have the functions of repair and nourishment, and includes components such as polyquaternium, which has certain irritation to the currently common sensitive and fragile skin. Chinese Patent Application CN106491380A discloses a facial cleansing instrument special N-acyl amino acid anionic surfactant-based facial cleanser / cream and its preparation method. The facial cleanser / cream includes components such as N-acyl amino acid anionic surfactant, betaine surfactant, sorbitol, sodium lactate, alkyl glycoside, hydroxypropyl methyl cellulose, plant peptide, oil, auxiliary agent and water. This facial cleanser / cream is suitable for use with a facial cleansing instrument, has rich and delicate foam, is mild and skin-friendly, non-irritating, can thoroughly remove dirt, sweat and oil in pores, makes the skin transparent and bright after use, keeps the skin moisturized, and at the same time forms a natural protective film that does not damage the skin, with good stability. However, it does not solve the problem of oil defoaming, and the mass percentage of plant oils such as olive oil, lavender oil and rose oil contained is only 1-3%, without significant repair and nourishment effects.

[0005] Therefore, it is very necessary to develop an amino acid facial cleansing composition with simple ingredients, mild and non-irritating to the skin, and good soothing and repair effects. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an amino acid facial cleansing composition and its preparation method.

[0007] To achieve the above purpose, the present invention provides the following technical solutions: An amino acid facial cleansing composition, by weight, includes the following raw materials: 50-60 parts of corn starch, 15-25 parts of mannitol, 15-20 parts of compound surfactant, 8-12 parts of modified carbon black, 1-1.5 parts of compound plant root extract, 0.5-1 part of osmanthus flower extract, 0.2-0.3 part of sodium benzoate, 0.2-0.3 part of allantoin, 0.5-0.8 part of trace components.

[0008] In the present invention, corn starch is used as the main powder matrix, which has the ability to absorb moisture and oil, helps to absorb excess oil and dirt on the skin surface, and at the same time improves the fluidity and dispersibility of the powder. It forms a soft paste or foam when encountering water; the added mannitol helps the product to disperse and foam in water, and at the same time can provide a smooth skin feel and has a certain moisturizing effect; the composite surfactant has the effects of reducing the surface tension of water, emulsifying oil, dispersing dirt, and generating foam; the modified carbon black has the function of adsorbing surfactants and dirt in the system, and promoting thorough rinsing by releasing the loaded substances during the rinsing process, reducing the residue of surfactants; the composite plant root extract has the functions of soothing, anti-inflammatory, antioxidant and promoting skin repair, and at the same time can reduce the irritation of surfactants to the skin.

[0009] Preferably, an amino acid facial cleansing composition, by weight, comprises the following raw materials: 55 - 60 parts of corn starch, 20 - 25 parts of mannitol, 15 - 18 parts of composite surfactant, 8 - 10 parts of modified carbon black, 1.2 - 1.5 parts of composite plant root extract, 0.7 - 1 part of osmanthus flower extract, 0.2 - 0.25 part of sodium benzoate, 0.25 - 0.3 part of allantoin, 0.6 - 0.8 part of trace components.

[0010] Preferably, the composite surfactant is sodium lauroyl glutamate, decyl glucoside, sodium cocoyl amphoacetate with a mass ratio of 7 - 9:5 - 7:3 - 4; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, essence with a mass ratio of 20 - 25:5 - 10:5 - 10:10 - 15:5 - 10:3 - 5.

[0011] In the present invention, the added composite surfactant is composed of sodium lauroyl glutamate (anionic), decyl glucoside (non - ionic) and sodium cocoyl amphoacetate (amphoteric) in a specific ratio. It can combine the basic cleaning power of anionic surfactants, the extreme mildness and foam - and solubilization - assisting ability of non - ionic surfactants, as well as the foam - stabilizing and irritation - reducing ability of amphoteric surfactants, significantly reducing its interaction with skin keratin and intercellular lipids, thus greatly reducing the irritation of the whole system, being milder than the compound system composed of a single amino acid surfactant, and at the same time can provide a more comprehensive cleaning ability to effectively remove various dirt on the skin surface.

[0012] Preferably, S1: Add carbon black to acidic potassium permanganate solution, stir, and after the treatment is completed, filter, wash, and dry to obtain pretreated carbon black; S2: Add the pretreated carbon black in step S1 to deionized water, then add hydroxypropyl - β - cyclodextrin and glutaraldehyde, adjust the pH to 2 - 3, carry out a heating reaction, and after the reaction is completed, filter, wash, and dry to obtain organically modified carbon black; S3. Add the carbon black after organic treatment in step S2 to deionized water, then add decanol and isopropyl palmitate, carry out constant-temperature stirring, and after the stirring is completed, filter, dry and grind to obtain the modified carbon black.

[0013] Preferably, the mass fraction of the acidic potassium permanganate solution in step S1 is 5-8%, the pH is 1-2, the temperature of the stirring treatment is 40-50 °C, and the time is 2-3 h.

[0014] In the present invention, by carrying out acidification oxidation treatment on carbon black, oxygen-containing functional groups can be introduced on the surface of carbon black, which is beneficial to the subsequent reaction, and at the same time, the dispersibility and wettability of carbon black can be improved, reducing agglomeration and making it easier to be washed away by water.

[0015] Preferably, the mass ratio of the pretreated carbon black, hydroxypropyl-β-cyclodextrin and glutaraldehyde in step S2 is 50-60:10-14:2-3, the temperature of the heating reaction is 80-90 °C, and the time is 1-2 h.

[0016] In the present invention, the pretreated carbon is reacted with hydroxypropyl-β-cyclodextrin, and under the action of glutaraldehyde as a cross-linking agent, hydroxypropyl-β-cyclodextrin molecules with inclusion ability are introduced onto the carbon black. On the one hand, it improves the ability of carbon black to adsorb surfactants and reduces the residue of surfactants. On the other hand, it can also improve the ability of carbon black to load functional small molecules in the subsequent process.

[0017] Preferably, the mass ratio of the carbon black after organic treatment, decanol and isopropyl palmitate in step S3 is 60-70:5-7:2-3, the temperature of the constant-temperature stirring is 50-60 °C, and the time is 3-5 h.

[0018] In the present invention, the carbon black after organic treatment is stirred with deionized water, decanol and isopropyl palmitate at a constant temperature, so that decanol and isopropyl palmitate are included in the hydrophobic cavity of hydroxypropyl-β-cyclodextrin or adsorbed on the surface of the modified carbon black through hydrophobic interaction. The modified carbon black is loaded with these two "washing aid" components, decanol and isopropyl palmitate. Decanol has certain wetting and solubilizing abilities, while isopropyl palmitate has the functions of lubrication and changing the interface properties. Their synergistic effect can change the interaction between the carbon black particles adsorbed with dirt and surfactants and the skin surface, making the particles easier to be washed away by water flow, reducing the slippery or residual feeling after cleansing, thereby improving the skin feel and reducing the residence time of surfactants on the skin, further improving the mildness.

[0019] Preferably, the preparation method of the composite plant root extract is as follows: The Yucca brevifolia root and Polygonum cuspidatum root are pulverized at low temperature and then sieved to obtain a mixed plant powder. Subsequently, it is added to deionized water for impregnation. After the impregnation is completed, an ethanol aqueous solution is added, and extraction is carried out under ultrasonic conditions. After extraction twice, the filtrates are combined, and the filtrate is concentrated to a relative density of 1.15 - 1.2, spray-dried and pulverized to obtain the composite plant root extract.

[0020] Preferably, the mass ratio of the Yucca brevifolia root to the Polygonum cuspidatum root is 7 - 8:2 - 3, the temperature of the low-temperature pulverization is -40~-50°C, the addition amount of deionized water is 2 - 3 times the mass of the mixed plant powder, the temperature of the impregnation is 30 - 40°C, the time is 1 - 2 h, the addition amount of the ethanol aqueous solution is 10 - 15 times the mass of the mixed plant powder, the frequency of the ultrasonic wave is 20 - 30 kHz, the temperature is 50 - 60°C, and the extraction time is 30 - 40 min.

[0021] In the present invention, the composite plant extract is prepared from the Yucca brevifolia root and the Polygonum cuspidatum root in a specific ratio through processes such as low-temperature pulverization and ultrasonic-assisted extraction. The main active ingredient of the Yucca brevifolia root is steroidal saponin. Yucca saponin has natural surface activity, can produce foam, has certain cleaning ability, and has anti-inflammatory and immunomodulatory effects; the main active ingredients of the Polygonum cuspidatum root are resveratrol and anthraquinone compounds (such as emodin, chrysophanol). Resveratrol is a powerful antioxidant and anti-inflammatory agent, and has the potential to protect the skin from environmental damage, soothe redness and promote collagen synthesis; moreover, the saponin in Yucca brevifolia itself has surface activity and can form mixed micelles with other synthetic surfactants in the system. This mixed micellization process may change the CMC of the system, form more stable micelles, reduce the relative concentration of surfactant monomers, and thus reduce the irritation to the skin.

[0022] The present invention also protects a preparation method of the amino acid facial cleansing composition as described above, which includes the following steps: weighing the raw materials according to the formula, adding them to a mixing pot, and stirring and mixing evenly to obtain.

[0023] When using the amino acid facial cleansing composition provided by the present invention, take an appropriate amount of the product, add water and rub it to form foam, place it on the face and gently rub and wash, use the generated foam to massage and clean the face, and then rinse with clean water. It can not only effectively clean the excess oil and dust dirt on the surface of the skin and deep in the pores, but also has anti-inflammatory, antioxidant and skin repair-promoting effects, and there is less residual surfactant, which is very suitable for consumers with high requirements for skin mildness.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) The amino acid facial cleansing composition provided by the present invention reduces the potential irritation of the formula from the source by synergistically compounding a mild composite surfactant system, modified carbon black with special functions, and a variety of active plant extracts in a matrix composed of corn starch and mannitol, ensuring mild cleansing. At the same time, the unique modified carbon black significantly improves the rinsability of the product and reduces residue. In addition, the addition of specific plant extracts endows the product with significant soothing and repair effects, effectively making up for the deficiencies of traditional amino acid facial cleansing products in additional skin care functions. By utilizing the synergistic effect of the composite surfactant, modified carbon black, and composite plant root extracts, multiple effects such as cleansing, mildness, easy rinsability, less residue, soothing, and repair of the amino acid facial cleansing composition are achieved.

[0025] (2) The modified carbon black added to the amino acid facial cleansing composition provided by the present invention is prepared by methods such as acidification oxidation treatment, hydroxypropyl-β-cyclodextrin grafting, and subsequent inclusion of decanol and isopropyl palmitate, endowing the carbon black with unique functions. First, the grafted hydroxypropyl-β-cyclodextrin molecules can effectively adsorb or complex surfactant molecules in the formula, reducing their free concentration on the skin surface, thereby reducing the risk of their penetration and irritation. Second, the included decanol and isopropyl palmitate are released when encountering water during the facial cleansing and rinsing stage. These components can change the physicochemical properties of the particle / skin interface, such as reducing the surface tension or providing lubrication, thereby promoting the detachment of carbon black particles adsorbed with dirt and surfactants from the skin surface, achieving a more thorough and easier rinsing effect, and effectively avoiding the discomfort caused by the residue of powder and surfactant.

[0026] (3) The amino acid facial cleansing composition provided by the present invention uses a composite plant root extract prepared by a specific method and supplemented with allantoin, providing the facial cleansing composition with significant biological activity and multiple skin care effects; the composite plant root extract uses preparation techniques such as low-temperature grinding and ultrasonic-assisted extraction to ensure the maximum retention and synergistic effect of active ingredients such as polysaccharides, saponins, resveratrol, and flavonoids in the plant. The combination of these natural active substances endows the facial cleansing composition with excellent anti-inflammatory, soothing, antioxidant, and skin barrier repair-promoting abilities, effectively improving the shortcomings of existing amino acid facial cleansing products in deep nourishment and repair functions. The saponins in Yucca brevifolia itself have surface activity and can form mixed micelles with other synthetic surfactants in the system. This mixed micellization process may change the CMC of the system, form more stable micelles, reduce the relative concentration of surfactant monomers, and thus reduce the irritation to the skin, especially meeting the needs of consumers with high requirements for skin mildness and those who need soothing and repair effects. Detailed implementation mode

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Unless otherwise specified, the chemical reagents and materials in the present invention are purchased through market channels or synthesized from raw materials purchased through market channels.

[0029] The particle size of the carbon black is 10 - 15 μm.

[0030] Example 1 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 55 parts of corn starch, 20 parts of mannitol, 17 parts of composite surfactant, 10 parts of modified carbon black, 1.3 parts of composite plant root extract, 0.8 part of osmanthus flower extract, 0.25 part of sodium benzoate, 0.25 part of allantoin, 0.7 part of trace components.

[0031] Among them, the composite surfactant is sodium lauroyl glutamate, decyl glucoside, and sodium cocoamphoacetate with a mass ratio of 8:6:3.5; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 23:7:8:12:8:4; The preparation method of the modified carbon black comprises the following steps: S1. Add 55 g of carbon black to 900 mL of acidic potassium permanganate aqueous solution (the mass concentration of potassium permanganate is 7% and the pH is 1), stir at 65 °C for 2.5 h, filter, wash, and dry after the treatment to obtain pretreated carbon black; S2. Add 55 g of the pretreated carbon black in step S1 to 1 L of deionized water, then add 12 g of hydroxypropyl - β - cyclodextrin and 2.5 g of glutaraldehyde, adjust the pH to 2.5, react at 85 °C for 1.5 h under a nitrogen atmosphere, filter, wash, and dry after the reaction to obtain organically modified carbon black; S3. Add 65 g of the organically modified carbon black in step S2 to 1 L of deionized water, then add 6 g of decanol and 2.5 g of isopropyl palmitate, stir at a constant temperature of 55 °C and 130 r / min for 5 h, filter and dry after stirring to obtain the modified carbon black.

[0032] The preparation method of the composite plant root extract is as follows: Crush Yucca brevifolia roots and Polygonum cuspidatum roots with a mass ratio of 7.5:2.5 at -45°C and pass through a 100-mesh sieve to obtain a mixed plant powder. Subsequently, add the mixed plant powder to deionized water at 2.5 times its mass and soak it at a temperature of 35°C for 1.5 h. After soaking, add an ethanol aqueous solution (volume ratio of ethanol to water is 1:1) at 13 times the mass of the mixed plant powder, and perform extraction under ultrasonic conditions. The ultrasonic frequency is 25 kHz, the temperature is 55°C, and the extraction time is 35 min. After extracting twice, combine the filtrates, concentrate the filtrates to a relative density of 1.15, spray dry and pulverize to obtain the composite plant root extract.

[0033] Example 2 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 50 parts of corn starch, 15 parts of mannitol, 15 parts of composite surfactant, 8 parts of modified carbon black, 1 part of composite plant root extract, 0.5 part of osmanthus flower extract, 0.2 part of sodium benzoate, 0.2 part of allantoin, 0.5 part of trace components.

[0034] Among them, the composite surfactant is sodium lauroyl glutamate, decyl glucoside, and sodium cocoyl amphoacetate with a mass ratio of 7:5:3; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 20:5:5:10:5:3; The preparation method of the modified carbon black comprises the following steps: S1. Add 50 g of carbon black to 900 mL of acidic potassium permanganate aqueous solution (mass concentration of potassium permanganate is 5%, pH is 1), stir at 65°C for 2.5 h, filter, wash, and dry after treatment to obtain pretreated carbon black; S2. Add 50 g of the pretreated carbon black in step S1 to 1 L of deionized water, then add 10 g of hydroxypropyl - β - cyclodextrin and 2 g of glutaraldehyde, adjust the pH to 3, react at 80°C for 2 h under a nitrogen atmosphere, filter, wash, and dry after reaction to obtain organically modified carbon black; S3. Add 60 g of the organically modified carbon black in step S2 to 1 L of deionized water, then add 5 g of decanol and 2 g of isopropyl palmitate, stir at a constant temperature of 50°C and 100 r / min for 5 h, filter and dry after stirring to obtain the modified carbon black.

[0035] The preparation method of the composite plant root extract is as follows: The short-leaf yucca root and polygonum cuspidatum root with a mass ratio of 7:3 were crushed at -40°C and then passed through a 100-mesh sieve to obtain a mixed plant powder. Subsequently, the powder was immersed in deionized water with a volume twice that of the mixed plant powder at a temperature of 30°C for 2 h. After immersion, an ethanol aqueous solution (volume ratio of ethanol to water is 1:1) with a volume ten times that of the mixed plant powder was added, and extraction was carried out under ultrasonic conditions with a frequency of 30 kHz and a temperature of 50°C for 40 min. After extraction twice, the filtrates were combined, concentrated to a relative density of 1.15, spray-dried and pulverized to obtain the composite plant root extract.

[0036] Example 3 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 60 parts of corn starch, 25 parts of mannitol, 20 parts of composite surfactant, 12 parts of modified carbon black, 1.5 parts of composite plant root extract, 1 part of osmanthus flower extract, 0.3 part of sodium benzoate, 0.3 part of allantoin, 0.8 part of trace components.

[0037] Among them, the composite surfactant is sodium lauroyl glutamate, decyl glucoside, and sodium cocoamphoacetate with a mass ratio of 9:7:4; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 25:10:10:15:10:5; The preparation method of the modified carbon black comprises the following steps: S1. Add 60 g of carbon black into 900 mL of acidic potassium permanganate aqueous solution (mass concentration of potassium permanganate is 8%, pH is 2), stir at 65°C for 2.5 h, filter, wash, and dry after treatment to obtain pretreated carbon black; S2. Add 60 g of the pretreated carbon black in step S1 into 1 L of deionized water, then add 14 g of hydroxypropyl - β - cyclodextrin and 3 g of glutaraldehyde, adjust the pH to 2, react at 90°C for 1 h under a nitrogen atmosphere, filter, wash, and dry after reaction to obtain organically modified carbon black; S3. Add 70 g of the organically modified carbon black in step S2 into 1 L of deionized water, then add 7 g of decanol and 3 g of isopropyl palmitate, stir at a constant temperature of 60°C and 150 r / min for 3 h, filter and dry after stirring to obtain the modified carbon black.

[0038] The preparation method of the composite plant root extract is as follows: Crush Yucca schidigera roots and Polygonum cuspidatum roots with a mass ratio of 8:2 at -50 °C and then pass through a 100-mesh sieve to obtain a mixed plant powder. Subsequently, add the mixed plant powder to deionized water with a volume three times that of the mixed plant powder and impregnate it at a temperature of 40 °C for 1 h. After impregnation, add an ethanol aqueous solution (volume ratio of ethanol to water is 1:1) with a volume 15 times that of the mixed plant powder, and perform extraction under ultrasonic conditions. The ultrasonic frequency is 20 kHz, the temperature is 60 °C, and the extraction time is 30 min. After extraction twice, combine the filtrates, concentrate the filtrates to a relative density of 1.15, spray dry and pulverize to obtain the composite plant root extract.

[0039] Comparative Example 1 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 55 parts of corn starch, 20 parts of mannitol, 17 parts of composite surfactant, 10 parts of modified carbon black, 1.3 parts of composite plant root extract, 0.8 part of osmanthus flower extract, 0.25 part of sodium benzoate, 0.25 part of allantoin, 0.7 part of trace components.

[0040] Among them, the composite surfactant is sodium lauroyl glutamate, decyl glucoside, and sodium cocoamphoacetate with a mass ratio of 8:6:3.5; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate-60, sodium dihydrogen phosphate, and essence with a mass ratio of 23:7:8:12:8:4; The preparation method of the modified carbon black comprises the following steps: S1. Add 55 g of carbon black to 900 mL of acidic potassium permanganate aqueous solution (mass concentration of potassium permanganate is 7%, pH is 1), stir at 65 °C for 2.5 h, filter, wash, and dry after treatment to obtain pretreated carbon black; S2. Add 55 g of the pretreated carbon black in step S1 to 1 L of deionized water, then add 12 g of hydroxypropyl-β-cyclodextrin and 2.5 g of glutaraldehyde, adjust the pH to 2.5, react at 85 °C for 1.5 h under a nitrogen atmosphere, filter, wash, and dry after reaction to obtain modified carbon black.

[0041] The preparation method of the composite plant root extract is as follows: Crush Yucca filamentosa roots and Polygonum cuspidatum roots with a mass ratio of 7.5:2.5 at -45°C and pass through a 100-mesh sieve to obtain a mixed plant powder. Subsequently, add it to deionized water 2.5 times the mass of the mixed plant powder for impregnation. The impregnation temperature is 35°C and the time is 1.5 h. After impregnation, add an ethanol aqueous solution (volume ratio of ethanol to water is 1:1) 13 times the mass of the mixed plant powder, and perform extraction under ultrasonic conditions. The ultrasonic frequency is 25 kHz, the temperature is 55°C, and the extraction time is 35 min. After extracting twice, combine the filtrates, concentrate the filtrates to a relative density of 1.15, spray dry and pulverize to obtain the composite plant root extract.

[0042] Compared with Example 1, decanol and isopropyl palmitate were not introduced onto the modified carbon black in this comparative example.

[0043] Comparative Example 2 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 55 parts of corn starch, 20 parts of mannitol, 17 parts of composite surfactant, 10 parts of modified carbon black, 0.8 part of osmanthus flower extract, 0.25 part of sodium benzoate, 0.25 part of allantoin, 0.7 part of trace components.

[0044] Among them, the composite surfactant is sodium lauroyl glutamate, decyl glucoside, and sodium cocoamphoacetate with a mass ratio of 8:6:3.5; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 23:7:8:12:8:4; The preparation method of the modified carbon black comprises the following steps: S1. Add 55 g of carbon black to 900 mL of acidic potassium permanganate aqueous solution (mass concentration of potassium permanganate is 7%, pH is 1), stir at 65°C for 2.5 h, filter, wash, and dry after treatment to obtain pretreated carbon black; S2. Add 55 g of the pretreated carbon black in step S1 to 1 L of deionized water, then add 12 g of hydroxypropyl - β - cyclodextrin and 2.5 g of glutaraldehyde, adjust the pH to 2.5, react at 85°C for 1.5 h under a nitrogen atmosphere, filter, wash, and dry after reaction to obtain organically modified carbon black; S3. Add 65 g of the organically modified carbon black in step S2 to 1 L of deionized water, then add 6 g of decanol and 2.5 g of isopropyl palmitate, stir at a constant temperature of 55°C and 130 r / min for 5 h, filter and dry after stirring to obtain the modified carbon black.

[0045] Compared with Example 1, the composite plant root extract was not added in this comparative example.

[0046] Comparative Example 3 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 55 parts of corn starch, 20 parts of mannitol, 17 parts of composite surfactant, 10 parts of modified carbon black, 1.3 parts of composite plant root extract, 0.8 part of osmanthus flower extract, 0.25 part of sodium benzoate, 0.25 part of allantoin, 0.7 part of trace components.

[0047] Among them, the composite surfactant is sodium lauroyl glutamate and decyl glucoside with a mass ratio of 8:9.5; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 23:7:8:12:8:4; The preparation method of the modified carbon black comprises the following steps: S1. Add 55 g of carbon black into 900 mL of acidic potassium permanganate aqueous solution (the mass concentration of potassium permanganate is 7% and the pH is 1), stir at 65 °C for 2.5 h, filter, wash, and dry after the treatment to obtain pretreated carbon black; S2. Add 55 g of the pretreated carbon black in step S1 into 1 L of deionized water, then add 12 g of hydroxypropyl - β - cyclodextrin and 2.5 g of glutaraldehyde, adjust the pH to 2.5, react at 85 °C for 1.5 h under a nitrogen atmosphere, filter, wash, and dry after the reaction to obtain organically modified carbon black; S3. Add 65 g of the organically modified carbon black in step S2 into 1 L of deionized water, then add 6 g of decanol and 2.5 g of isopropyl palmitate, stir at a constant temperature of 55 °C and 130 r / min for 5 h, filter and dry after stirring to obtain the modified carbon black.

[0048] The preparation method of the composite plant root extract is as follows: Crush Yucca brevifolia roots and Polygonum cuspidatum roots with a mass ratio of 7.5:2.5 at - 45 °C and pass through a 100 - mesh sieve to obtain a mixed plant powder. Then add it into deionized water with a volume 2.5 times that of the mixed plant powder and soak it at a temperature of 35 °C for 1.5 h. After soaking, add an ethanol - aqueous solution (the volume ratio of ethanol to water is 1:1) with a volume 13 times that of the mixed plant powder, and perform extraction under ultrasonic conditions. The ultrasonic frequency is 25 kHz, the temperature is 55 °C, and the extraction time is 35 min. After extracting twice, combine the filtrates, concentrate the filtrates to a relative density of 1.15, spray - dry and pulverize to obtain the composite plant root extract.

[0049] Compared with Example 1, cocamidopropyl betaine is not added to the composite surfactant in this comparative example.

[0050] Comparative Example 4 An amino acid facial cleansing composition, by weight, comprises the following raw materials: 55 parts of corn starch, 20 parts of mannitol, 17 parts of compound surfactant, 10 parts of modified carbon black, 1.3 parts of compound plant root extract, 0.8 part of osmanthus flower extract, 0.25 part of sodium benzoate, 0.25 part of allantoin, 0.7 part of trace components.

[0051] Among them, the compound surfactant is sodium lauroyl glutamate and sodium cocoyl amphoacetate with a mass ratio of 14:3.5; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 23:7:8:12:8:4; The preparation method of the modified carbon black includes the following steps: S1. Add 55 g of carbon black into 900 mL of acidic potassium permanganate aqueous solution (the mass concentration of potassium permanganate is 7% and the pH is 1), stir at 65 °C for 2.5 h, filter, wash, and dry after the treatment to obtain pretreated carbon black; S2. Add 55 g of the pretreated carbon black in step S1 into 1 L of deionized water, then add 12 g of hydroxypropyl - β - cyclodextrin and 2.5 g of glutaraldehyde, adjust the pH to 2.5, react at 85 °C for 1.5 h under a nitrogen atmosphere, filter, wash, and dry after the reaction to obtain organically modified carbon black; S3. Add 65 g of the organically modified carbon black in step S2 into 1 L of deionized water, then add 6 g of decanol and 2.5 g of isopropyl palmitate, stir at a constant temperature of 55 °C and 130 r / min for 5 h, filter and dry after stirring to obtain the modified carbon black.

[0052] The preparation method of the compound plant root extract is as follows: Crush Yucca brevifolia root and Polygonum cuspidatum root with a mass ratio of 7.5:2.5 at - 45 °C and pass through a 100 - mesh sieve to obtain a mixed plant powder. Then add deionized water with a volume 2.5 times that of the mixed plant powder for impregnation. The impregnation temperature is 35 °C and the time is 1.5 h. After impregnation, add an ethanol - aqueous solution (the volume ratio of ethanol to water is 1:1) with a volume 13 times that of the mixed plant powder, and carry out extraction under ultrasonic conditions. The ultrasonic frequency is 25 kHz, the temperature is 55 °C, and the extraction time is 35 min. Combine the filtrates after extraction twice, concentrate the filtrate to a relative density of 1.15, spray - dry and pulverize to obtain the compound plant root extract.

[0053] Compared with Example 1, decyl glucoside is not added to the compound surfactant in this comparative example.

[0054] The skin cleansing effects of the amino acid facial cleansing compositions prepared in Examples 1-3 and Comparative Examples 1-4 were evaluated as follows: 70 oily skin volunteers aged between 20 and 45 years old were selected. They were randomly divided into 7 groups, with 5 females and 5 males in each group (meeting the conditions of having no serious systemic diseases, no immunodeficiency or autoimmune diseases, no serious allergic history to skin care cosmetics, not having used hormonal drugs and immunosuppressants within the past month, and not participating in other clinical trials, etc.). The Sebumeter tester was used to analyze the skin oil content of the volunteers. The volunteers could not use cosmetics or topical medications 3 days before the test. Before the test, the volunteers sat quietly in an environment at 22°C and an air humidity of 50% for 30 minutes. The skin oil content at the intersection of the midline between the eyebrows and the parallel line 1 cm away from the upper eyebrow margin on the forehead was measured using the test instrument. Subsequently, the products prepared in Examples 1-3 and Comparative Examples 1-4 were applied at this position, and massaged and rubbed for 3 minutes to help the product absorb. Then, it was rinsed with clean water. After the volunteers sat quietly in a room at 22°C and an air humidity of 50% for 30 minutes, the skin oil content at the same position was measured again using the test instrument. The tests for the same subject were completed by the same measurement personnel, and the skin oil cleaning rate was calculated. Skin oil cleaning rate (%) = (V2 - V1) / V2 × 100%, where V1 is the skin oil content after using the sample, and V2 is the skin oil content before using the sample. DPPH free radical scavenging rate test: The amino acid facial cleansing compositions prepared in Examples 1-3 and Comparative Examples 1-4 were formulated into a test solution with a concentration of 0.5 g / 100 mL. 3 mL of the test solution was taken and added to 3 mL of 0.1 mmol / L DPPH solution (dissolved in absolute ethanol). After mixing evenly, it was placed at room temperature for 30 minutes, and then the absorbance (Ai) of each mass concentration sample was measured at 517 nm. It was determined in parallel 3 times and the average value was taken. At the same time, 3 mL of the test solution was added to 3 mL of absolute ethanol to measure the absorbance (Aj). In addition, 3 mL of absolute ethanol was taken instead of the sample and added to 3 mL of DPPH free radical solution to measure the blank absorbance (Ao). According to the formula: Scavenging rate = (1 - )(×100%), calculate the DPPH free radical scavenging rate. Surfactant residue test: The test results are shown in Table 2 below: Use the amino acid facial cleansing composition solutions (20% wt) of Examples 1-3 and Comparative Examples 1-4 to treat a fixed area on the inner forearm for 2 min, then rinse it clean with deionized water, and dry the area with a clean paper towel; Measure the initial Lab value of the skin with an LS171 color difference meter, take three parallel data, and obtain the average value; Apply 2 mL of 1% aqueous indigo carmine dye solution to the marked area for 1 min for staining treatment; Remove the dye with deionized water and rinse the area, and dry the area with a clean paper towel. Measure the Lab value of the skin with an LS171 color difference meter, record the △E*ab value of the color contrast before and after using the color difference meter, take three parallel data, and obtain the average value. The tests of the same volunteer are completed by the same measurement personnel. Indigo carmine is an acidic dye, which can stain the proteins on the skin surface blue. Therefore, the more surfactant remains on the skin surface, the lower the dyeing intensity. △E*ab represents the total color difference. The larger this value is, the greater the difference from the initial color. The largest △E*ab value indicates that the skin is the bluest at this time, the color difference change is the largest, the most dyeing occurs, and the least surfactant remains on the skin surface; The smallest △E*ab value indicates that the skin color difference change is the smallest at this time, the least dyeing occurs, and the most surfactant remains on the skin surface. The test results are shown in Table 1 below.

[0055] Table 1 As can be seen from Table 1 above, the amino acid facial cleansing composition prepared by the present invention has the functions of cleaning and degreasing, and at the same time has good DPPH free radical scavenging ability. Moreover, after use, the residual amount of surfactant on the skin is small, and it has good application prospects.

[0056] The above content is a further detailed description of the present invention in combination with specific implementation examples. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

[0057] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention should all be included in the protection scope of the present invention.

Claims

1. An amino acid facial cleansing composition, characterized in that, By weight, it includes the following raw materials: 50 - 60 parts of corn starch, 15 - 25 parts of mannitol, 15 - 20 parts of compound surfactant, 8 - 12 parts of modified carbon black, 1 - 1.5 parts of compound plant root extract, 0.5 - 1 part of osmanthus flower extract, 0.2 - 0.3 part of sodium benzoate, 0.2 - 0.3 part of allantoin, 0.5 - 0.8 part of trace components.

2. The amino acid facial cleansing composition according to claim 1, wherein By weight, it includes the following raw materials: 55 - 60 parts of corn starch, 20 - 25 parts of mannitol, 15 - 18 parts of compound surfactant, 8 - 10 parts of modified carbon black, 1.2 - 1.5 parts of compound plant root extract, 0.7 - 1 part of osmanthus flower extract, 0.2 - 0.25 part of sodium benzoate, 0.25 - 0.3 part of allantoin, 0.6 - 0.8 part of trace components.

3. The amino acid facial cleansing composition according to claim 1, characterized in that, The compound surfactant is sodium lauroyl glutamate, decyl glucoside, and sodium cocoamphoacetate with a mass ratio of 7 - 9:5 - 7:3 - 4; the trace components are hydroxyethyl cellulose, arginine, disodium hydrogen phosphate, polysorbate - 60, sodium dihydrogen phosphate, and essence with a mass ratio of 20 - 25:5 - 10:5 - 10:10 - 15:5 - 10:3 - 5.

4. The amino acid facial cleansing composition according to claim 1, wherein The preparation method of the modified carbon black includes the following steps: S1. Add carbon black into an acidic potassium permanganate solution, stir, filter, wash, and dry after completion to obtain pretreated carbon black. S2. Add the pretreated carbon black in step S1 into deionized water, then add hydroxypropyl - β - cyclodextrin and glutaraldehyde, adjust the pH to 2 - 3, and carry out a heating reaction. Filter, wash, and dry after completion to obtain organically modified carbon black. S3. Add the organically modified carbon black in step S2 into deionized water, then add decanol and isopropyl palmitate, carry out constant - temperature stirring, filter, dry, and grind to obtain the modified carbon black.

5. The amino acid facial cleansing composition according to claim 1, wherein In step S1, the mass fraction of the acidic potassium permanganate solution is 5 - 8%, the pH is 1 - 2, the temperature of the stirring treatment is 40 - 50°C, and the time is 2 - 3 h.

6. The amino acid facial cleansing composition according to claim 1, wherein In step S2, the mass ratio of the pretreated carbon black, hydroxypropyl - β - cyclodextrin, and glutaraldehyde is 50 - 60:10 - 14:2 - 3, the temperature of the heating reaction is 80 - 90°C, and the time is 1 - 2 h.

7. The amino acid facial cleansing composition according to claim 1, wherein In step S3, the mass ratio of the organically modified carbon black, decanol, and isopropyl palmitate is 60 - 70:5 - 7:2 - 3, the temperature of the constant - temperature stirring is 50 - 60°C, and the time is 3 - 5 h.

8. The amino acid facial cleansing composition according to claim 1, wherein The preparation method of the compound plant root extract is as follows: Low - temperature crush short - leaf yucca roots and polygonum cuspidatum roots and sieve to obtain a mixed plant powder. Then add it into deionized water for impregnation. After impregnation, add an ethanol aqueous solution and carry out extraction under ultrasonic conditions. Extract twice and combine the filtrates. Concentrate the filtrates to a relative density of 1.15 - 1.2, spray - dry and pulverize to obtain the compound plant root extract.

9. The amino acid facial cleansing composition according to claim 1, characterized in that The mass ratio of the Yucca brevifolia root to the Polygonum cuspidatum root is 7-8:2-3. The temperature of cryogenic grinding is -40~-50°C. The addition amount of deionized water is 2-3 times the mass of the mixed plant powder. The temperature of impregnation is 30-40°C, and the time is 1-2 h. The addition amount of the ethanol aqueous solution is 10-15 times the mass of the mixed plant powder. The frequency of ultrasonic treatment is 20-30 kHz, the temperature is 50-60°C, and the extraction time is 30-40 min.

10. A method for preparing the amino acid facial cleansing composition according to any one of claims 1-9, characterized in that, It includes the following steps: Weigh the raw materials according to the formula, add them to the mixing pot, and stir and mix evenly to obtain the product.

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