Emulsifier-free scrub and preparation method thereof
By using components such as emulsifier-free and hydrophobic filling powder in the scrub, and achieving uniform mixing of components through specific preparation methods, the discomfort caused by the irritation of sensitive skin and large filling powder particles in the existing scrubs, and the stability and use effect are improved.
Patent Information
- Application Number
- CN202510055746.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-04-08
AI Technical Summary
Existing scrubs often contain emulsifiers, which may cause irritation to sensitive skin, large filling powder particles lead to skin discomfort, and the preparation method leads to uneven distribution of components, affecting product stability and use effect.
Develop a scrub without emulsifiers, using hydrophobic filling powder, skin feel conditioner, moisturizing agent, oil and preservatives to achieve uniform mixing of each component through specific preparation methods to ensure the stability and use effect of the product.
The stability and use effect of emulsifier-free scrub is achieved, which reduces the risk of irritation on sensitive skin, improves the skin feeling and comfort of the product, and ensures the wide application prospects and market value of the product.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of cosmetics, in particular to an emulsifier-free scrub and a preparation method thereof. Background Art
[0002] Most scrub products on the market contain emulsifiers. Although these emulsifiers can improve the consistency and stability of the product, they may also cause irritation or allergic reactions to the skin. In addition, the filler powder particles in some scrubs are large, which may cause discomfort to the skin when used. Therefore, the development of an emulsifier-free, gentle and effective scrub has become an urgent need in the cosmetics industry.
[0003] The defects of the existing technology are mainly reflected in the following aspects: first, scrubs containing emulsifiers may irritate sensitive skin; second, the filling powder particles in some scrubs are large, which may cause discomfort to the skin when used; finally, the existing preparation method may lead to uneven distribution of components, affecting the stability and use effect of the product. Summary of the invention
[0004] In order to solve the above technical problems, the present invention provides an emulsifier-free scrub and a preparation method thereof. The scrub of the present invention is composed of filler powder, skin feel regulator, moisturizer, oil and preservative, does not contain conventional surfactant emulsifiers on the market, and achieves uniform mixing of the components through a specific preparation method, aiming to provide a mild and effective exfoliating product.
[0005] The first object of the present invention is to provide an emulsifier-free scrub, comprising 30-40% hydrophobic filler powder, 5-10% skin feel regulator, 15-30% moisturizer, 2-10% oil, 0.5-1% preservative, and the balance being water, calculated by mass fraction;
[0006] The moisturizing agent is one or more of glycerol, propylene glycol, butylene glycol and sorbitol.
[0007] In some embodiments of the present invention, the mass percentage of glycerol and propylene glycol is 15-30%. The present invention utilizes short-chain fatty alcohol moisturizers to reduce the water-oil interfacial tension γ to a certain extent. Increasing the concentration of alcohols will reduce the interfacial tension γ. Because of the surface excess of the solution and the wetting effect between the liquid and the solid, the alcohol moisturizer is adsorbed on the surface of the solid powder, and because of the interfacial tension, the powder can be suspended or floated in the water. Because the surface of the surface-treated powder is hydrophobic, the interfacial tension will cause it to spontaneously form micelles. However, this micelle is unstable, and a stable water-in-oil emulsion will be formed after adding oil.
[0008] Furthermore, the hydrophobic filler powder is preferably 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 31-40%, 32-40%, 33-40%, 34-40%, 35-40%, 36-40%, 37-40%, 38-40%, etc.
[0009] In some embodiments of the present invention, the hydrophobic filler powder is obtained by treating filler powder with a hydrophobic treatment agent, and the treatment agent is selected from one or more of triethoxycaprylylsilane, polydimethylsiloxane, and polymethylsiloxane.
[0010] The hydrophobic filling powder is selected from one or more of hydrophobic silica, hydrophobic mica or hydrophobic boron nitride.
[0011] In some embodiments of the present invention, the filler powder is selected from one or more of silica, mica, and boron nitride.
[0012] In some embodiments of the present invention, the skin feel regulator is one or more of silica, silica silylate, polydimethylsiloxane / polyvinyl dimethylsiloxane cross-linked copolymer, and boron nitride.
[0013] In some embodiments of the present invention, the oil is selected from one or more of isononyl isononanoate, caprylic / capric triglyceride, synthetic squalane, and polydimethylsiloxane.
[0014] In some embodiments of the present invention, the preservative is selected from one or more of phenoxyethanol, caprylyl glycol, ethylhexylglycerin, and hexylene glycol.
[0015] The second object of the present invention is to provide a method for preparing the emulsifier-free scrub, comprising the following steps:
[0016] S1: mixing and dispersing the hydrophobic filler powder and the skin feel regulator evenly to obtain a mixture 1;
[0017] S2: uniformly dispersing part of the oil, part of the preservative and the mixture 1 at high speed to obtain a mixture 2;
[0018] S3: mixing the moisturizer, the remaining preservative and water to obtain a mixture 3;
[0019] S4: Mixing mixture 2 and mixture 3 at high speed and dispersing them uniformly to obtain mixture 4;
[0020] S5: The remaining oil and the mixture 4 are mixed and dispersed uniformly to obtain the emulsifier-free scrub.
[0021] In some embodiments of the present invention, in step S2, the stirring speed of the high-speed dispersion is 100-500 rpm.
[0022] In some embodiments of the present invention, in step S4, the stirring speed of the mixed high-speed dispersion is 500-1000 rpm.
[0023] The above technical solution of the present invention has the following advantages compared with the prior art:
[0024] The present invention does not contain emulsifiers, which reduces the risk of irritation to sensitive skin; secondly, the use of hydrophobically modified filler powder improves the skin feel and comfort of the product; thirdly, the uniform mixing of the components is achieved through a specific preparation method, which ensures the stability and use effect of the product. Therefore, the emulsifier-free scrub of the present invention has broad application prospects and market value.
[0025] According to the Traube rule and the Antonoff rule, the present invention states that amphiphilic molecules can change the interfacial tension γ of water, and short-chain fatty alcohol moisturizers have a certain effect of reducing the interfacial tension γ of water and oil. Increasing the concentration of alcohols will reduce the interfacial tension γ. According to the Gibbs adsorption formula: It can be seen that the gas-liquid interface of the water-alcohol solution is mostly composed of hydrophobic groups. Because of the excess surface of the solution and the wetting effect between the liquid and the solid, the alcohol moisturizer is adsorbed on the surface of the solid powder, and because of the interfacial tension, the powder can be suspended or floated in the water. Because the surface of the surface-treated powder is hydrophobic, the interfacial tension will cause it to spontaneously form micelles. However, this micelle is unstable and will form a stable water-in-oil emulsion after adding oil.
[0026] The emulsifier-free scrub prepared by the above method not only has a good exfoliating effect, but also has a fine texture and is easy to apply and clean. In addition, the present invention also ensures that the product can provide sufficient moisture and protection for the skin during use by selecting appropriate types and proportions of moisturizers and oils. In short, the emulsifier-free scrub and preparation method thereof provided by the present invention effectively solve the problems existing in the prior art and bring consumers a safer and more comfortable skin care experience. DETAILED DESCRIPTION
[0027] The present invention is further described below in conjunction with specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is described in detail below in conjunction with embodiments.
[0029] The raw materials used in the examples are all commercially available common raw materials, and the relevant descriptions are as follows:
[0030] Filler powder: silica, polymethylsiloxane, trade name: Kingsica 5028MS, manufacturer: Jiangxi Liankai Technology Co., Ltd.
[0031] Filler powder: silica, triethoxyoctylsilane, trade name: Kingsica 5028AS, manufacturer: Jiangxi Liankai Technology Co., Ltd.
[0032] Skin feel regulator: silica silylate, trade name: Kingsica K15, manufacturer: Jiangxi Liankai Technology Co., Ltd.
[0033] Skin feel regulator: boron nitride, polydimethylsiloxane, trade name: Kingbornit 500SI, manufacturer: Jiangxi Liankai Technology Co., Ltd.
[0034] Skin feel regulator: polydimethylsiloxane / polyvinyl dimethylsiloxane cross-linked copolymer, silica, trade name: DC 9701 manufacturer: Dow Corning;
[0035] Preservatives: phenoxyethanol, caprylyl glycol = 6.5:3.5, trade name: Microcare PHG Manufacturer: Thor Specialty Chemicals (Zhenjiang) Co., Ltd.
[0036] Examples 1-5
[0037] (1) Raw material composition: including filler powder, oil, preservative, moisturizer, water, see Table 1 below for details. Table 1 Formula of emulsifier-free scrub of Examples 1-7 (mass percentage)
[0038]
[0039]
[0040] (2) This embodiment provides a method for preparing an emulsifier-free scrub, which is as follows:
[0041] S1: Add the formulated amount of phase A materials into a powder mixer and mix them at high speed to obtain mixture 1.
[0042] S2: Add the formulated amount of phase B material into a powder mixer and mix them evenly with mixture 1 to obtain mixture 2.
[0043] S3: Mix the formulated amount of phase C materials uniformly to obtain mixture 3.
[0044] S4: Slowly add mixture 3 to mixture 2, mix them evenly at a stirring speed of 200 RPM in a beaker, and after obtaining mixture 4, increase the stirring speed to 900 RPM and mix until the state of the materials changes and becomes uniform.
[0045] S5: Add the formulated amount of phase D material into mixture 4, and stir evenly at 200 RPM to obtain an emulsifier-free scrub.
[0046] Comparative Example 1
[0047] The difference between Comparative Example 1 and Example 1 is that no Crodaniol GTCC is added, and the default amount is supplemented with water. The rest is the same as Example 1.
[0048] Comparative Example 2
[0049] The difference between Comparative Example 2 and Example 1 is that Kingsica 5028MS is not added, and the default amount is supplemented with water. The rest is the same as Example 1.
[0050] Comparative Example 3
[0051] The difference between Comparative Example 3 and Example 1 is that Kingsica 5028MS is replaced by silica in an amount of 40%. The rest is the same as Example 1.
[0052] Comparative Example 4
[0053] The difference between Comparative Example 4 and Example 1 is that the amount of moisturizer is adjusted to 6% glycerol and 13% propylene glycol, and the missing part is supplemented with water. The rest is the same as Example 1.
[0054] Comparative Example 5
[0055] The difference between Comparative Example 5 and Example 1 is that the amount of Kingsica 5028MS is adjusted to 50%, and the rest is the same as Example 1.
[0056] Comparative Example 6
[0057] The difference between Comparative Example 6 and Example 1 is that the amount of Kingsica 5028MS is adjusted to 30%, and the rest is the same as Example 1.
[0058] Comparative Example 7
[0059] The difference from Example 1 is that the moisturizer is replaced with long-chain alcohols: behenyl alcohol and stearyl alcohol (mass ratio is 8.2:19.4), and the rest is the same as Example 1.
[0060] Effect verification
[0061] 1. Comparative test of cold resistance and heat resistance
[0062] Experimental operation: Pre-adjust the electric constant temperature incubator to 40℃ and the refrigerator to -18℃. Take 10ml of the sample to be tested in a 15ml inspection bottle and put it vertically into the constant temperature incubator or refrigerator. Take it out and observe it within the specified time (the stability is judged by whether it settles and water discharges). The experimental results are shown in Table 2.
[0063] Table 2 Room temperature and high and low temperature inspection results record
[0064] name Room temperature Low temperature high temperature Example 1 Stable 14d Stable 14d Stable 14d Example 2 Stable 14d Stable 14d Stable 14d Example 3 Stable 10d Stable 7d Stable 7d Example 4 Stable 10d Stable 9d Stable 9d Example 5 Stable 12d Stable 12d Stable 9d Comparative Example 1 Stable 14d Stable 10d Stable 3D Comparative Example 2 Water and oil separation Water and oil separation Water and oil separation Comparative Example 3 Water and oil separation Water and oil separation Water and oil separation Comparative Example 4 Stable 5d Stable 3D Water and oil separation Comparative Example 5 Agglomeration Agglomeration Agglomeration Comparative Example 6 Stable 10d Stable 9d Stable 4D Comparative Example 7 Water and oil separation Water and oil separation Water and oil separation
[0065] From the results in Table 2, it can be seen that the scrubs obtained in Examples 1, 2 and 5 have good stability, among which Examples 1 and 2 have the best stability.
[0066] In Comparative Example 1, Crodaniol GTCC was omitted, and only a small amount of oil phase was used as the internal phase in the emulsion, resulting in poor micelle stability.
[0067] Comparative Example 2 omitted Kingsica 5028MS and failed to form emulsified micelles.
[0068] In comparative example 3, Kingsica 5028AS was used to replace Kingsica 5028MS. Different surface treatment agents would change the interfacial tension and skin feel of the solid-liquid interface.
[0069] The humectant content in Comparative Example 4 is relatively low, the interfacial tension is relatively large, and the micelle stability is average.
[0070] The silicon powder content in Comparative Example 5 is too high and an emulsion cannot be formed.
[0071] Comparative Example 6 has a higher water content, a larger interfacial tension, and a general stability of the emulsion micelles.
[0072] Comparative Example 7 uses long-chain fatty alcohols: behenyl alcohol and stearyl alcohol. Long-chain fatty alcohols are lipophilic, have low interfacial tension, and have weak emulsification ability, and cannot form a stable emulsion.
[0073] The above results show that the emulsifier-free scrub provided in the embodiment of the present invention, the filling powder is mainly silica treated with polymethylsiloxane, and the moisturizing agents are glycerin and propylene glycol. The amount of use is strictly controlled, so that the obtained scrub product has good cold and heat resistance stability.
[0074] 2. Volunteer Trial Experiment
[0075] 30 volunteers were selected and divided into 10 groups, 3 people in each group, and the scrub samples of Examples 1-5 and Comparative Examples 1, 4, and 6 were tried respectively. The other unstable samples were not tested. The method of use is as follows: wet the lower arm of the left hand with water, take 3g of the sample, and then apply it on the wet lower wall of the left hand, rub back and forth evenly for 2 minutes, and then wash it with clean water. Record the use experience and score, the full score of each indicator is 10 points, and the average score of the 3 volunteers is taken, as shown in Table 3 below.
[0076] Table 3
[0077]
[0078] From the results in Table 3, it can be seen that the overall use experience of Example 1 and Example 2 is good, and Example 1 is the best example.
[0079] From the results in Table 3, it can be seen that both Example 1 and Example 2 use surface-modified silica, and the silica treated with triethoxycaprylylsilane has a more obvious exfoliating effect, but the smearing feeling, spreading effect, and cleaning and refreshing degree are reduced; the exfoliating effect of the silica treated with polymethylsiloxane is slightly weaker, but the smearing, spreading, and cleaning and refreshing degree are excellent, and it is more popular with users.
[0080] From the results in Table 3, it can be seen that in Example 3, when the silica methide is removed alone, the spreading effect and the cleansing freshness are improved, and the exfoliation effect and the smearing evaluation are reduced, indicating that the addition of silica methide can improve the exfoliation effect and the smearing evaluation.
[0081] From the results in Table 3, it can be seen that when the polydimethylsiloxane-treated boron nitride is removed alone in Example 4, the spreading effect and the smearing evaluation will be significantly reduced, indicating that adding polydimethylsiloxane-treated boron nitride will improve the spreading effect and optimize the smearing evaluation.
[0082] From the results in Table 3, it can be seen that when the polydimethylsiloxane / polyvinyl dimethylsiloxane cross-linked copolymer and silica are removed from Example 5, the cleaning freshness and the spreadability evaluation are significantly reduced, indicating that the addition of polydimethylsiloxane / polyvinyl dimethylsiloxane cross-linked copolymer and silica can improve the cleaning freshness and optimize the spreadability evaluation.
[0083] From the results in Table 3, it can be seen that when the moisturizer ratio in Comparative Example 4 is reduced, the exfoliation effect and the smear evaluation will be reduced, indicating that the moisturizer ratio has an impact on the exfoliation effect and the smear evaluation.
[0084] From the results in Table 3, it can be seen that when the proportion of polymethylsiloxane-treated silica in Comparative Example 6 is reduced, the exfoliating effect will be greatly reduced, indicating that increasing the content of polymethylsiloxane-treated silica within a certain range will significantly improve the exfoliating effect.
[0085] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.
Claims
1. An emulsifier-free scrub, characterized in that: Hydrophobic filler powder: 30-40%, skin feel regulator: 5-10%, moisturizer: 15-30%, oil: 2-10%, preservative: 0.5-1%, the balance is water, calculated by mass fraction.
2. The emulsifier-free scrub according to claim 1, characterized in that: The hydrophobic filling powder is obtained by treating the filling powder with a hydrophobic treatment agent, and the treatment agent is selected from one or more of triethoxyoctylsilane, polydimethylsiloxane, and polymethylsiloxane.
3. The emulsifier-free scrub according to claim 2, characterized in that: The filling powder is selected from one or more of silica, mica or boron nitride.
4. The emulsifier-free scrub according to claim 1, characterized in that: The skin feel regulator is one or more of silica, silica silylate, polydimethylsiloxane / polyvinyl dimethylsiloxane cross-linked copolymer, and boron nitride.
5. The emulsifier-free scrub according to claim 1, characterized in that: The oil is selected from one or more of isononyl isononanoate, caprylic / capric triglyceride, synthetic squalane, and polydimethylsiloxane.
6. The emulsifier-free scrub according to claim 1, characterized in that: The moisturizing agent is one or more of glycerol, propylene glycol, butylene glycol and sorbitol.
7. The emulsifier-free scrub according to claim 1, characterized in that: The preservative is selected from two or more of phenoxyethanol, caprylyl glycol, ethylhexylglycerin and hexylene glycol.
8. A method for preparing the emulsifier-free scrub according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: mixing and dispersing the hydrophobic filler powder and the skin feel regulator evenly to obtain a mixture 1; S2: uniformly dispersing part of the oil, part of the preservative and the mixture 1 at high speed to obtain a mixture 2; S3: mixing the moisturizer, the remaining preservative and water to obtain a mixture 3; S4: Mixing mixture 2 and mixture 3 at high speed and dispersing them uniformly to obtain mixture 4; S5: The remaining oil and the mixture 4 are mixed and dispersed uniformly to obtain the emulsifier-free scrub.
9. The preparation method according to claim 8, characterized in that: In step S2, the stirring speed of the high-speed dispersion is 100 to 500 rpm.
10. The preparation method according to claim 8, characterized in that: In step S4, the stirring speed of the mixed high-speed dispersion is 500 to 1000 rpm.