Crystalline mild cleansing cream and preparation method thereof

Abstract

The invention relates to a crystal type mild cleansing cream and a preparation method thereof, and belongs to the technical field of cosmetics. The crystalline mild cleansing cream is prepared from the following components: glycerol, a mixed amino acid surfactant, lauryl hydroxyl sulfobetaine, disodium lauryl sulfosuccinate, a chelating agent, citric acid, a preservative, a skin conditioning component and water, wherein the mixed amino acid surfactant is formed by mixing solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and a sodium cocoyl glycinate aqueous solution; the cleansing cream comprises the following components in percentage by mass: 25%-35% of glycerol, 18%-25% of active ingredients of the mixed amino acid surfactant, 3%-4.5% of lauryl hydroxyl sulfobetaine and 1%-3% of disodium lauryl sulfosuccinate. According to the crystal type mild cleansing cream, no extra thickening agent component is used, the cream body which is good in texture and stable is obtained only through synergistic thickening of the three amino acid surfactants, irritation is small, sensitive skin friendliness is achieved, the preparation technology is simple, and cost is low.

Description

Technical Field

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

[0002] Existing facial cleansing products can generally be divided into thickening type and crystalline type. Among them, thickening type facial cleansing products (such as sulfate facial cleansers or APG facial cleansers) provide a certain viscosity to the product through thickeners (such as carbomer and xanthan gum). However, since surfactants have a viscosity-reducing effect, a relatively large amount of thickeners often need to be added to the product, resulting in difficulties in spreading, slow foaming, a feeling of false smoothness, and a feeling of incomplete rinsing, and the acceptance is generally average for Asians; crystalline facial cleansing products usually have advantages such as high cleaning power, easy spreading, rapid foaming, rich foam, and easy rinsing, and have been widely welcomed by Asian consumers in recent years. Soap-based facial cleansers, as typical crystalline facial cleansing products, once dominated the market, but due to their relatively high alkalinity (about pH 9-10), they may damage the skin barrier and cause dryness or sensitivity problems, and have gradually been replaced by mild amino acid surfactant systems in recent years. However, the paste stability of amino acid facial cleansers is poor. It is easy to harden and become rough at low temperatures, and to delaminate or become thin and overflow at high temperatures. How to maintain the paste stability is a technical problem that needs to be solved in the research and development of amino acid facial cleansers.

[0003] Patent CN106726698A discloses an amino acid facial cleanser, which includes 10-30 wt% amino acid surfactant, 0.5-2 wt% thickener, 0.2-2.5 wt% neutralizer, 0.1-1 wt% skin conditioner and deionized water. This formulation adds a macromolecular thickener and a skin conditioner represented by inorganic salts to achieve the stability of the system. However, the addition of the thickener makes it not a pure crystalline system, which not only affects the appearance and foaming performance of the product, but also is not easy to clean and has residues, and the usability is weaker than that of a pure crystalline system, and the addition of inorganic salts has a certain potential irritation to the skin and mucous membranes.

[0004] Patent CN110638679A discloses an amino acid facial cleanser cream prepared by compounding potassium amino acid salt and sodium amino acid salt, and its preparation method. The facial cleanser cream contains the following components: 20-24% of humectant, 8-12% of mixed amino acids, 0.9-1.5% of neutralizer, 20-24% of sodium amino acid salt surfactant, 10-18% of co-surfactant, 0.5-1.5% of emulsifier, 2-3% of auxiliary forming agent, 0-0.5% of fatting agent, 2.5-3.5% of thickener, 0- appropriate amount of essence; the pH is 6.0-6.8. This patent prepares the amino acid facial cleanser cream by compounding potassium amino acid salt surfactant and sodium amino acid salt surfactant, and at the same time adds PEG thickener to improve the stability of the paste. However, in this patent, a strong base is used to react with the mixed amino acids to obtain potassium amino acid salt, and the preparation is cumbersome. In addition, lauric acid, which belongs to the soap-based component, is added to the formula, which has certain irritation to the skin. In addition, a large amount of PEG thickener is added, and it is not a pure crystalline system, which will affect the use experience to a certain extent.

[0005] Patent CN116712345A discloses a pure crystalline acne-removing amino acid facial cleanser cream. By using an amino acid surfactant prepared by compounding amino acid salts a such as potassium cocoyl glycinate, amino acids b such as cocoyl glutamic acid and sodium stearoyl glutamate in a certain ratio, the self-thickening effect is achieved and the stability of the paste is improved. However, although this formula does not use a thickener, it adds a relatively high content of amino acid surfactant and a high content of modified amino acids, and the overall preparation cost is relatively high, and the irritation is relatively strong, which is not friendly to people with sensitive skin. Further, although the paste of this formula can be stable at 45°C, it does not solve the problem that the paste becomes thinner at 45°C, and there is still a certain stability risk. In addition, the crystallization characteristics of glutamate surfactant and glycine surfactant are different. Glutamate surfactant spontaneously forms crystals, while glycine surfactant crystallizes under acidic conditions. Although mixing the two amino acid surfactants helps crystallization, there is a risk of incompatibility, and other stability problems such as the paste becoming coarser and water seeping out may occur during long-term storage at low temperature or normal temperature.

[0006] Patent CN116392400A discloses a crystalline amino acid facial cleanser cream and its preparation method. By appropriately adding a crystallizing agent and a crystallization regulator, the crystal size and morphology of the amino acid surfactant in an alcohol-water system under acidic conditions are adjusted, so as to achieve the purpose of increasing the stability of the paste and improving the appearance of the paste. However, although this formula does not use a large amount of amino acid surfactant and thickener, it adds a high content of glycerol, and the crystallizing agent added is a nano-scale powder raw material, which has a certain safety risk.

[0007] In summary, although the existing amino acid facial cleansers disclosed in the above patents all use amino acid surfactants as the main surfactants, in order to obtain a facial cleanser paste with good consistency and stability, either thickeners are added, or a high content of amino acid surfactants and polyols are used, or a paste texture is obtained through partial neutralization of complex amino acid components. These methods either affect the final use experience of the product, or increase the preparation cost and the preparation process is complex, or the added components have certain irritation, cause greater damage to the skin cutin layer, and are not friendly to sensitive skin. Therefore, how to provide a pure crystalline facial cleanser with low preparation cost, low irritation and stable paste at 50 °C is a technical problem that needs to be solved urgently at present. Summary of the Invention

[0008] In view of the above technical problems, the present invention provides a crystalline mild facial cleanser and a preparation method thereof. The crystalline mild facial cleanser does not use any additional thickening agent components, and only obtains a stable paste texture through the synergistic thickening of three amino acid surfactants. Its paste can still be stable at 50 °C, and the contents of amino acid surfactants and glycerol in its formulation system are relatively low, with low irritation, friendly to sensitive skin, simple preparation process and low preparation cost.

[0009] The present invention provides a crystalline mild facial cleanser, which is composed of the following components: glycerol, mixed amino acid surfactants, lauryl hydroxysulfobetaine, disodium lauryl sulfosuccinate, chelating agent, citric acid, preservative, skin conditioning component and water; wherein, the mixed amino acid surfactants are composed of solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and an aqueous solution of sodium cocoyl glycinate; in the facial cleanser, the mass percentage of glycerol is 25% - 35%, the total mass percentage of the effective components of the mixed amino acid surfactants is 18% - 25%, the mass percentage of lauryl hydroxysulfobetaine is 3% - 4.5%, and the mass percentage of disodium lauryl sulfosuccinate is 1% - 3%; in the mixed amino acid surfactants, the mass ratio of solid potassium cocoyl glycinate to solid sodium cocoyl glycinate is 4:1 - 3:2, and the ratio of the total mass of solid potassium cocoyl glycinate and solid sodium cocoyl glycinate to the mass of sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate is 9:1 - 7:3.

[0010] In some embodiments, in the facial cleanser, the mass percentage of glycerol is 30%, the total mass percentage of the effective components of the mixed amino acid surfactants is 20%, the mass percentage of lauryl hydroxysulfobetaine is 3.6%, and the mass percentage of disodium lauryl sulfosuccinate is 2%.

[0011] In some of these embodiments, in the mixed amino acid surfactant, the mass ratio of solid potassium cocoyl glycinate, solid sodium cocoyl glycinate, and sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate is 21:10:9.

[0012] In some of these embodiments, in the facial cleanser paste, the mass percentage of the chelating agent is 0.05% to 0.1%, the mass percentage of citric acid is 0.5% to 1.5%, the mass percentage of the preservative is 1% to 2%, and the mass percentage of the skin conditioning component is 0.1% to 5%.

[0013] In some of these embodiments, the chelating agent is selected from at least one of disodium EDTA, tetrasodium EDTA, trisodium ethylenediaminedisuccinate, sodium phytate, and tetrasodium glutamate diacetate.

[0014] In some of these embodiments, the preservative is selected from at least one of p - hydroxyacetophenone, 1,2 - hexanediol, pentylene glycol, ethylhexyl glycerin ether, raspberry ketone, and octanoyl hydroxamic acid.

[0015] In some of these embodiments, the skin conditioning component includes a soothing and moisturizing component, and the soothing and moisturizing component includes the following components by mass percentage: squalane 0.1% - 1%, sodium hyaluronate 0.01% - 0.1%, citrus fruit extract 0.01% - 0.1%, and red tangerine peel oil 0.1% - 0.5%.

[0016] In some of these embodiments, the pH of the crystalline mild facial cleanser paste is 6.4 - 6.8.

[0017] The present invention also provides a preparation method of the crystalline mild facial cleanser paste according to any one of the above technical solutions, including the following steps:

[0018] Mix glycerol and the mixed amino acid surfactant, and stir until evenly dispersed to obtain Phase A;

[0019] Dissolve the chelating agent in water to obtain Phase B;

[0020] Heat Phase A, and slowly add Phase B to Phase A with stirring, and stir until evenly mixed to obtain mixture a;

[0021] Maintain the temperature of mixture a, add lauryl hydroxy sulfo betaine with stirring, and stir until completely dissolved to obtain mixture b;

[0022] Maintain the temperature of mixture b, add citric acid to adjust the pH of mixture b, then add disodium lauryl sulfosuccinate, and stir until completely dissolved to obtain mixture c;

[0023] Cool the mixture c initially, add a preservative under stirring, and stir until completely dissolved to obtain a paste d;

[0024] Continue to cool the paste d, add skin conditioning components under stirring, and discharge after stirring until the material is uniform to obtain a crystalline mild facial cleanser paste.

[0025] In some of these embodiments, the phase A is heated to 80 °C and then the phase B is added. The mixture c is initially cooled to 40 °C and then the preservative is added. The paste d is further cooled to 35 °C and then the skin conditioning components are added.

[0026] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0027] 1. The crystalline mild facial cleanser paste provided by the present invention adopts a mixed amino acid surfactant system composed of three different types of glycine surfactants, namely solid potassium cocoyl glycinate, solid sodium cocoyl glycinate, and an aqueous solution of sodium cocoyl glycinate. Without adding a thickener under the conditions of low glycerol content and low amino acid surfactant content, through the compounding of three different types of glycine surfactants in a specific ratio, a crystalline amino acid facial cleanser paste with good texture and stability is obtained. It belongs to a pure crystalline system, has rich foam, is easy to rinse, and has a good use experience;

[0028] 2. The crystalline mild facial cleanser paste provided by the present invention has low glycerol content and low amino acid surfactant content, with little irritation. Moreover, other auxiliary components are used as little as possible, the formula system has fewer components, simplifies skin care, is friendly to sensitive skin, and is conducive to simplifying the preparation process and reducing the preparation cost;

[0029] 3. The three amino acid surfactants used in the compounding of the crystalline mild facial cleanser paste provided by the present invention are all glycine surfactants, which have the same crystallization characteristics and there is no risk of incompatibility. Its paste can still remain in an unmelted state at 50 °C, with high paste stability, can be stored stably for a long time, and can meet the storage and transportation requirements in high-temperature seasons;

[0030] 4. The preparation method of the crystalline mild facial cleanser paste provided by the present invention has simple preparation steps, does not require complex equipment and cumbersome process flows, reduces production costs and energy consumption, is conducive to large-scale industrial production, and has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a photo of the material state of the crystalline mild facial cleanser paste provided in Examples 1-5 of the present invention at 50 °C. Among them, the products represented by (a)-(e) correspond to Examples 1-5 respectively;

[0032] Figure 2Photos of the product states of each test group in the verification test of the present invention at 50°C. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 any creative work shall fall within the protection scope of the present invention.

[0034] The embodiments of the present invention provide a crystalline mild facial cleanser, which is composed of the following components: glycerol, mixed amino acid surfactant, lauryl hydroxysulfobetaine, disodium lauryl sulfosuccinate, chelating agent, citric acid, preservative, skin conditioning component and water; wherein, the mixed amino acid surfactant is composed of solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and an aqueous solution of sodium cocoyl glycinate; in the facial cleanser, the mass percentage of glycerol is 25% - 35%, the total mass percentage of the active ingredients of the mixed amino acid surfactant is 18% - 25%, the mass percentage of lauryl hydroxysulfobetaine is 3% - 4.5%, and the mass percentage of disodium lauryl sulfosuccinate is 1% - 3%; in the mixed amino acid surfactant, the mass ratio of solid potassium cocoyl glycinate to solid sodium cocoyl glycinate is 4:1 - 3:2, and the ratio of the total mass of solid potassium cocoyl glycinate and solid sodium cocoyl glycinate to the mass of sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate is 9:1 - 7:3. It should be noted that the active ingredients of the mixed amino acid surfactant specifically refer to solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate. It should also be noted that the skin conditioning component refers to the general term for the components in cosmetics / skin care products that act on the skin (such as whitening, moisturizing, soothing, anti-aging, anti-wrinkle, acne removal, oil control, sun protection, repair, etc.), and the jargon is also called the active ingredients of cosmetics / skin care products.

[0035] The above-mentioned crystalline mild facial cleanser uses a mixed amino acid surfactant system composed of three different types of glycine surfactants: solid potassium cocoyl glycinate, solid sodium cocoyl glycinate, and an aqueous solution of sodium cocoyl glycinate. Without adding a thickener and with low glycerol content and low amino acid surfactant content, through the compounding of three different types of glycine surfactants in a specific ratio, a crystalline amino acid facial cleanser with good texture and stability is obtained. It belongs to a pure crystalline system, has rich foam, is easy to rinse, and provides a good user experience. At the same time, the above-mentioned crystalline mild facial cleanser has a low glycerol content and a low amino acid surfactant content, with little irritation. Moreover, as few other auxiliary components as possible are used, the formula system has fewer components, simplifies skin care, is friendly to sensitive skin, and is conducive to simplifying the preparation process and reducing the preparation cost. It should be noted that the higher the glycerol content, the easier it is to crystallize, and the higher the amino acid surfactant content, the easier it is to crystallize. Therefore, existing amino acid facial cleansers either contain a high content of glycerol (greater than 35%) or a high content of amino acid surfactants (greater than 25%). Reducing both the glycerol content and the amino acid surfactant content simultaneously will increase the crystallization difficulty. In addition, for the above-mentioned crystalline mild facial cleanser, the three amino acid surfactants used in the compounding are all glycine surfactants, which have the same crystallization characteristics and there is no risk of incompatibility. Its paste can still remain in an unmelted state at 50°C, with high paste stability, can be stored stably for a long time, and can meet the storage and transportation requirements in high-temperature seasons.

[0036] In a preferred embodiment, in the facial cleanser, the mass percentage of glycerol is 30%, the total mass percentage of the effective components of the mixed amino acid surfactant is 20%, the mass percentage of lauryl hydroxysulfobetaine is 3.6%, and the mass percentage of disodium lauryl sulfosuccinate is 2%. This preferred embodiment further defines the optimal contents of glycerol, the effective components of the mixed amino acid surfactant, lauryl hydroxysulfobetaine, and disodium lauryl sulfosuccinate. The crystalline mild facial cleanser obtained at these optimal contents has better texture and stability.

[0037] In a preferred embodiment, in the mixed amino acid surfactant, the mass ratio of solid potassium cocoyl glycinate, solid sodium cocoyl glycinate, and sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate is 21:10:9. This preferred embodiment further defines the optimal ratio of the three different types of glycine surfactants. The crystalline mild facial cleanser obtained at this optimal ratio has better paste stability.

[0038] In a preferred embodiment, in the facial cleanser paste, the mass percentage of the chelating agent is 0.05% - 0.1%, the mass percentage of citric acid is 0.5% - 1.5%, the mass percentage of the preservative is 1% - 2%, and the mass percentage of the skin conditioning component is 0.1% - 5%. This preferred embodiment further defines the preferred contents of the chelating agent, citric acid, preservative, and skin conditioning component. The crystalline mild facial cleanser paste obtained at these preferred contents has a better use experience. It should be noted that the skin conditioning component can be a whitening component, a moisturizing component, a soothing component, an anti-aging component, an anti-wrinkle component, an anti-acne component, an oil-control component, a sunscreen component, a repair component, etc. Its dosage is adjusted according to the dosage required for the specific component to take effect, and can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5%, etc.

[0039] In a preferred embodiment, the chelating agent is selected from at least one of disodium EDTA, tetrasodium EDTA, trisodium ethylenediamine disuccinate, sodium phytate, and tetrasodium glutamate diacetate. This preferred embodiment specifically gives the preferred types of chelating agents, which is beneficial for cooperation with other components. It can be understood that those skilled in the art can also use other chelating agents.

[0040] In a preferred embodiment, the preservative is selected from at least one of p-hydroxyacetophenone, 1,2-hexanediol, pentanediol, ethylhexyl glycerin ether, raspberry ketone, and octanoyl hydroxamic acid. This preferred embodiment specifically gives the preferred types of preservatives, which is beneficial for ensuring product quality while ensuring use safety. It can be understood that those skilled in the art can also use other preservatives.

[0041] In a preferred embodiment, the skin conditioning component includes a soothing and moisturizing component, and the soothing and moisturizing component includes the following components by mass percentage: squalane 0.1%-1%, sodium hyaluronate 0.01%-0.1%, citrus fruit extract 0.01%-0.1%, and tangerine peel oil 0.1%-0.5%. This preferred embodiment further provides a preferred skin conditioning component, which is beneficial to obtaining a better use experience. It should be noted that when the above-mentioned soothing and moisturizing component is adopted, the total content of the skin conditioning component can be 0.24%-1.63%. It should also be noted that among them, the citrus fruit extract and tangerine peel oil can also be replaced by other plant extracts, such as: lime peel extract, citrus peel extract, petitgrain oil, pomelo peel oil, sweet orange peel extract, bitter orange flower water, bitter orange flower extract, etc. In addition, it can be understood that those skilled in the art can also use skin conditioning components with other functions, such as: repair components, whitening components, sunscreen components, acne-removing components, oil-control components, anti-wrinkle components, etc.

[0042] In a preferred embodiment, the pH of the crystalline mild facial cleanser is 6.4-6.8. This preferred embodiment further limits the preferred range of pH. Within this preferred pH range, it is more conducive to the crystallization of glycine surfactants.

[0043] The embodiment of the present invention also provides a preparation method of the above-mentioned crystalline mild facial cleanser, including the following steps:

[0044] S1. Mix glycerol and the mixed amino acid surfactant, and stir until evenly dispersed to obtain phase A;

[0045] S2. Dissolve the chelating agent in water to obtain phase B;

[0046] S3. Heat up phase A, and slowly add phase B to phase A under stirring, and stir until evenly mixed to obtain the mixed liquid a;

[0047] S4. Keep the temperature of the mixed liquid a, add lauryl hydroxy sulfo betaine under stirring, and stir until completely dissolved to obtain the mixed liquid b;

[0048] S5. Keep the temperature of the mixed liquid b, add citric acid to adjust the pH of the mixed liquid b, and then add disodium lauryl sulfosuccinate, and stir until completely dissolved to obtain the mixed liquid c;

[0049] S6. Make the mixed liquid c cool down initially, add the preservative under stirring, and stir until completely dissolved to obtain the paste d;

[0050] S7. Make the paste d continue to cool down, add the skin conditioning component under stirring, and stir until the material is uniform and then discharge to obtain the crystalline mild facial cleanser.

[0051] The preparation method of the above-mentioned crystalline mild facial cleanser has simple preparation steps, does not require complex equipment and cumbersome technological processes, reduces production costs and energy consumption, is conducive to large-scale industrial production, and has good economy.

[0052] In the preparation method of the above-mentioned crystalline mild facial cleanser, it should be noted that in steps S1 to S5, medium-speed stirring is adopted, and the rotation speed is preferably 100 rpm to 300 rpm; in step S6, frame paddle low-speed stirring is adopted, and the rotation speed is preferably 50 rpm to 100 rpm; in step S7, frame paddle low-speed stirring is adopted, and the rotation speed is preferably 30 rpm to 60 rpm.

[0053] In a preferred embodiment, the phase A is heated to 80 °C and then the phase B is added. After the mixed liquid c is preliminarily cooled to 40 °C, a preservative is added. After the paste d is further cooled to 35 °C, a skin conditioning component is added. This preferred embodiment further specifically defines the mixing reaction temperature of steps S3 - S5 and the cooling temperature of steps S6 and S7, which is conducive to preparing a crystalline amino acid facial cleanser with good texture and stability. Specifically: heating the phase A to 80 °C is more conducive to mixing with the phase B; adding the preservative after cooling to 40 °C in step S6 can avoid the decomposition of the preservative; adding the skin conditioning component after cooling to 35 °C in step S7 is conducive to maintaining the activity of the skin conditioning component.

[0054] In order to introduce the crystalline mild facial cleanser and its preparation method provided by the embodiments of the present invention more clearly and in detail, the following will be described in combination with specific embodiments.

[0055] Example 1

[0056] A crystalline mild facial cleanser is composed of the following components and water by mass percentage: glycerol 30%, mixed amino acid surfactant 20% (this mass percentage is calculated according to the total mass of the active ingredients of the mixed amino acid surfactant), lauryl hydroxysulfobetaine 3.6%, disodium laureth sulfosuccinate 2%, chelating agent 0.05%, citric acid 0.9%, preservative 0.6%, soothing and moisturizing component (skin conditioning component) 0.42%; wherein, the mixed amino acid surfactant is composed of solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and an aqueous solution of sodium cocoyl glycinate, the chelating agent is disodium EDTA, the preservative is a mixture of p-hydroxyacetophenone and 1,2-hexanediol in a mass ratio of 5:1, and the soothing and moisturizing component includes 0.01% of squalane, 0.01% of sodium hyaluronate, 0.3% of citrus fruit extract and 0.1% of tangerine peel oil. The specific component mass percentages of the crystalline mild facial cleanser are shown in Table 1.

[0057] Table 1 Composition ratio table of the crystalline mild facial cleanser provided in Examples 1 - 5 (mass percentage)

[0058]

[0059] The preparation method of the above-mentioned crystalline mild facial cleanser cream comprises the following steps:

[0060] S1. Mix glycerol and a mixed amino acid surfactant, and stir at a medium speed (100 rpm - 300 rpm) until evenly dispersed to obtain Phase A;

[0061] S2. Dissolve the chelating agent in water to obtain Phase B;

[0062] S3. Heat Phase A to 80°C, and slowly add Phase B to Phase A under medium-speed stirring (100 rpm - 300 rpm), and stir until evenly mixed to obtain a mixed liquid a;

[0063] S4. Keep the temperature of the mixed liquid a at 80°C, add Phase C under medium-speed stirring, and stir at a medium speed (100 rpm - 300 rpm) for 15 minutes until completely dissolved to obtain a mixed liquid b;

[0064] S5. Keep the temperature of the mixed liquid b at 80°C, add Phase D to adjust the pH of the mixed liquid b within the range of 6.4 - 6.8, stir at a medium speed (100 rpm - 300 rpm) for 15 minutes, then add Phase E, and stir at a medium speed (100 rpm - 300 rpm) until completely dissolved to obtain a mixed liquid c;

[0065] S6. Cool the mixed liquid c to 40°C, add Phase F under low-speed stirring (frame paddle stirring at 50 rpm - 100 rpm), and stir until completely dissolved to obtain a paste d;

[0066] S7. Continue to cool the paste d to 35°C, add Phase G under low-speed stirring (frame paddle stirring at 30 rpm - 60 rpm), and stir until the material is uniform and then discharge to obtain the crystalline mild facial cleanser cream.

[0067] Example 2

[0068] The difference between this example and Example 1 lies in that the dosages of various components are different. For the specific dosages of each component, see Table 1.

[0069] Example 3

[0070] The difference between this example and Example 1 lies in that the dosages of various components are different. For the specific dosages of each component, see Table 1.

[0071] Example 4

[0072] The difference between this example and Example 1 lies in that the dosages of various components are different. For the specific dosages of each component, see Table 1.

[0073] Example 5

[0074] The difference between this example and Example 1 lies in that the dosages of various components are different. For the specific dosages of each component, please refer to Table 1.

[0075] Product paste stability test

[0076] Put the crystalline mild facial cleanser pastes prepared in Examples 1-5 into an oven at 50 °C to test the stability of the product paste at high temperature. The photos of the corresponding paste states of Examples 1-5 are as Figure 1 shown. It can be seen from Figure 1 that the crystalline mild facial cleanser pastes prepared in Examples 1-5 all remained in an unmelted state at 50 °C high temperature.

[0077] Verification test

[0078] This test examines the influence of the ratio of three different types of glycine surfactants in the mixed amino acid surfactant on the stability of the product paste.

[0079] The difference between each test group and Example 1 in this test lies in that the ratio of three different types of glycine surfactants in the mixed amino acid surfactant is different. For the dosages and ratios of the three different types of glycine surfactants, please refer to Table 2.

[0080] Table 2 Ratio table of three different types of glycine surfactants in each test group (mass percentage)

[0081]

[0082]

[0083] Put the products prepared in each test group into an oven at 50 °C to test the stability of the product paste at high temperature. The photos of the corresponding paste states of each test group are as Figure 2 shown. It can be seen from Figure 2 that: Test groups 1-3, 11-18, 22, 26-27 were in a melted state; Test groups 9-10, 21, 25, 30 were not completely melted, but the paste turned yellow; Test groups 4-8, 19-20, 23-24, 28-29 were not melted, and the paste remained white. However, among the test groups that were not melted and the paste remained white, the paste textures of Test groups 4-8, 19, 23-24, 28-29 were relatively hard, with a poor usage experience, and their paste-forming temperatures were relatively high, which was not convenient for preparation. Only Test group 20, in which the mass ratio AK:AS of solid potassium cocoyl glycinate and solid sodium cocoyl glycinate was in the range of 4:1 to 3:2, and the ratio (AK + AS) / ASL of the total mass of solid potassium cocoyl glycinate and solid sodium cocoyl glycinate to the mass of sodium cocoyl glycinate in the sodium cocoyl glycinate aqueous solution was in the range of 9:1 to 7:3, had both good texture and stability.

Claims

1. A crystalline mild facial cleanser, characterized in that, It consists of the following components: glycerin, mixed amino acid surfactant, lauryl hydroxysulfobetaine, disodium lauryl sulfosuccinate, chelating agent, citric acid, preservative, skin conditioning component and water; wherein, the mixed amino acid surfactant is formed by mixing solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and an aqueous solution of sodium cocoyl glycinate; in the facial cleanser cream, the mass percentage of glycerin is 25% - 35%, the total mass percentage of the active ingredients of the mixed amino acid surfactant is 18% - 25%, the mass percentage of lauryl hydroxysulfobetaine is 3% - 4.5%, and the mass percentage of disodium lauryl sulfosuccinate is 1% - 3%; in the mixed amino acid surfactant, the mass ratio of solid potassium cocoyl glycinate to solid sodium cocoyl glycinate is 4:1 - 3:2, and the ratio of the total mass of solid potassium cocoyl glycinate and solid sodium cocoyl glycinate to the mass of sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate is 9:1 - 7:

3.

2. The crystalline mild facial cleanser according to claim 1, characterized in that, In the facial cleanser cream, the mass percentage of glycerin is 30%, the total mass percentage of the active ingredients of the mixed amino acid surfactant is 20%, the mass percentage of lauryl hydroxysulfobetaine is 3.6%, and the mass percentage of disodium lauryl sulfosuccinate is 2%.

3. The crystalline mild facial cleanser according to claim 1 or 2, characterized in that In the said mixed amino acid surfactant, the mass ratio of solid potassium cocoyl glycinate, solid sodium cocoyl glycinate and sodium cocoyl glycinate in the aqueous solution of sodium cocoyl glycinate is 21:10:

9.

4. The crystalline mild facial cleanser according to claim 1, wherein In the facial cleanser cream, the mass percentage of the chelating agent is 0.05% - 0.1%, the mass percentage of citric acid is 0.5% - 1.5%, the mass percentage of the preservative is 1% - 2%, and the mass percentage of the skin conditioning component is 0.1% - 5%.

5. The crystalline mild facial cleanser according to claim 1 or 4, characterized in that, The chelating agent is selected from at least one of disodium EDTA, tetrasodium EDTA, trisodium ethylenediaminedisuccinate, sodium phytate and tetrasodium glutamate diacetate.

6. The crystalline mild facial cleanser according to claim 1 or 4, characterized in that, The preservative is selected from at least one of p - hydroxyacetophenone, 1,2 - hexanediol, pentanediol, ethylhexyl glycerin ether, raspberry ketone and octanoyl hydroxamic acid.

7. The crystalline mild facial cleanser according to claim 1 or 4, characterized in that, The skin conditioning component includes a soothing and moisturizing component, and the soothing and moisturizing component includes the following components by mass percentage: squalane 0.1% - 1%, sodium hyaluronate 0.01% - 0.1%, citrus fruit extract 0.01% - 0.1% and red tangerine peel oil 0.1% - 0.5%.

8. The crystalline mild facial cleanser according to claim 1, wherein, The pH of the crystalline mild facial cleanser cream is 6.4 - 6.

8.

9. The preparation method of the crystalline mild facial cleanser according to any one of claims 1-8, characterized in that, It includes the following steps: Mix glycerin and the mixed amino acid surfactant, and stir until evenly dispersed to obtain Phase A; Dissolve the chelating agent in water to obtain Phase B; Heat up Phase A, and slowly add Phase B to Phase A with stirring, and stir until evenly mixed to obtain mixture a; Maintain the temperature of mixture a, add lauryl hydroxysulfobetaine with stirring, and stir until completely dissolved to obtain mixture b; Maintain the temperature of mixture b, add citric acid to adjust the pH of mixture b, then add disodium lauryl sulfosuccinate, and stir until completely dissolved to obtain mixture c; Cool the mixture c initially, add a preservative under stirring, and stir until completely dissolved to obtain a paste d; Continue to cool the paste d, add skin conditioning components under stirring, and discharge after stirring until the material is uniform to obtain a crystalline mild facial cleanser.

10. The preparation method of the crystalline mild facial cleanser according to claim 9, characterized in that, Heat phase A to 80°C and then add phase B. Cool the mixture c initially to 40°C and then add a preservative. Continue to cool the paste d to 35°C and then add skin conditioning components.

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