Oil-control skin-care colloidal sulfur powder cream and preparation method thereof

Abstract

The invention provides oil-control skin-care colloidal sulfur powder cream and a preparation method thereof. The oil-control skin-care colloidal sulfur powder cream comprises the following components in percentage by mass: 5-10% of sulfur, 15-25% of kaolin, 10-20% of silicon dioxide, 3-8% of acacia gum, 10-25% of a wetting agent, 2-7% of an active component, 1-4% of an auxiliary agent and the balance of a solvent. According to the invention, colloidal sulfur with relatively small particle size is used, so that effective delivery is provided, visibility and odor of components are reduced to the greatest extent, and acne and comedo are prevented by a milder method, so that the composition becomes an ideal choice for people with sensitive skin. Besides, silicon dioxide, kaolin, colloidal sulfur and other components are compounded, specific powder-to-cream treatment is carried out, the powder-to-emulsion texture is unique, use is easier, when pressure is applied in the smearing process, the powder is subjected to phase change, light emulsion is formed, and therefore the powder acts on the skin, and the requirements of the market and consumers are met.

Description

Technical Field

[0001] This invention relates to the field of skincare technology, and in particular to an oil-controlling skincare colloidal sulfur powder cream and its preparation method. Background Technology

[0002] Sulfur, a traditional active ingredient in acne treatments, is widely used in acne product formulations due to its excellent effects in inhibiting sebum secretion, killing Propionibacterium acnes, and dissolving keratin. However, existing sulfur-containing acne products still have many technical shortcomings, limiting their application efficacy and target population: On the one hand, the sulfur used in traditional products is mostly ordinary powder with a large particle size, which not only leads to low bioavailability of the active ingredient, making it difficult to effectively penetrate deep into the hair follicles, but also easily leaves residue on the skin surface, causing obvious visual impact and affecting the appearance after product use; on the other hand, large-particle sulfur is highly irritating to the skin and has a strong odor, seriously affecting the user experience and failing to meet the core requirement of gentle products for people with sensitive skin. In addition, some products use complex formulation systems to improve the dispersibility of sulfur, further increasing the risk of skin allergies.

[0003] In recent years, to improve the ease of use and skin feel of products, powder-to-cream emulsions have gradually become a hot research and development area in the industry. These products aim to achieve controllable dosage and portability through their powder form, while transforming into a lotion texture during application through pressure, enhancing the product's integration with the skin. However, existing powder-to-cream emulsion acne treatment products still have significant shortcomings in formulation design and manufacturing processes: First, the compounding systems of most products are unreasonable, failing to effectively combine acne-fighting active ingredients (such as sulfur) with the powder-to-cream function, making it difficult to balance acne-fighting efficacy and gentleness, often resulting in poor acne-fighting effects or strong irritation to sensitive skin; Second, the powder-to-cream effect of some products is unstable, failing to smoothly transform into a uniform, lightweight lotion after pressure, or leaving a heavy, sticky feel that is difficult to integrate naturally into the skin, affecting the user experience; Third, the selection of adjuvants used in existing products to achieve the phase-change function and improve ingredient compatibility is inappropriate, either failing to ensure stable delivery of active ingredients or further exacerbating the burden and irritation on the skin.

[0004] In summary, existing acne treatment products generally have many problems. The market needs an acne treatment product that is gentle and low in irritation, delivers active ingredients efficiently, allows for controllable dosage, is portable and easy to use, and has an excellent skin feel, in order to meet the needs of consumers, especially those with sensitive skin. This is also a technical problem that urgently needs to be solved by those skilled in the art.

[0005] In conclusion, there is an urgent need to develop a new technical solution to address the problems existing in the current technology and meet the needs of the market and consumers. Summary of the Invention

[0006] Based on this, the present invention provides an oil-controlling skincare colloidal sulfur powder cream containing 5-10% sulfur. This not only helps control excess oil and reduce the occurrence of localized blemishes, but the use of colloidal sulfur with a small particle size also facilitates effective delivery and minimizes the visibility and odor of the ingredients, providing a gentler method to prevent acne and pimples, making it ideal for people with sensitive skin. Furthermore, the present invention, through a compounding of silica with kaolin, colloidal sulfur, and other components, and a specific powder-to-cream conversion process, possesses a unique powder-to-emulsion texture. The powder form is easier to use and carry. When pressure is applied during application, the powder undergoes a phase change, forming a lightweight emulsion that acts on the skin, meeting the market and consumer demand for portable skincare products.

[0007] One object of the present invention is to provide an oil-controlling skincare colloidal sulfur powder cream, wherein the oil-controlling skincare colloidal sulfur powder cream comprises the following components by mass fraction: Sulfur 5-10% Kaolin 15-25% 10-20% silicon dioxide Acacia gum 3-8% Wetting agent 10-25% 2-7% of active ingredients Additives 1-4% Solvent balance.

[0008] Furthermore, it also includes modified silica, which is obtained by reacting silica with unsaturated fatty acids, silicone oil, olefins and alkenyl polyethylene glycol, wherein the silicone oil is a hydrogen-containing silicone oil.

[0009] Furthermore, the modified silica has a mass fraction of 1-5%.

[0010] Furthermore, the wetting agent includes glycerin and ethylene glycol.

[0011] Furthermore, the active ingredients include nicotinamide and carnitine.

[0012] Furthermore, the additives include pH adjusters, buffers, and preservatives.

[0013] Another object of the present invention is to provide a method for preparing the above-mentioned oil-controlling skin-care colloidal sulfur powder cream, wherein the method for preparing the oil-controlling skin-care colloidal sulfur powder cream includes the following steps: S1. Mix the solvent and humectant and heat them. Then add acacia gum, stir to dissolve, and then add the active ingredients and additives to obtain the adhesive solution. S2. After pulverizing the sulfur, mix it with kaolin and silica, then spray granulate it and add it to the adhesive solution. After drying, sieving, aging and homogenizing, an oil-controlling and skin-care colloidal sulfur powder cream is obtained.

[0014] Furthermore, it also includes the preparation of modified silica: L1. Unsaturated fatty acids and silicon dioxide are mixed and heated to react, yielding an intermediate product. L2. Mix silicone oil and catalyst, heat, then add olefins to raise the temperature and react, then add alkenyl polyether to continue the reaction, and finally add intermediate products to continue the reaction to obtain modified silica.

[0015] Furthermore, in step L1, the temperature of the heating reaction is 80-110°C.

[0016] Furthermore, in step L2, the temperature of the heating reaction is 100-120°C.

[0017] Furthermore, after the drying process, the moisture content is 2-3 wt%.

[0018] Furthermore, the mass ratio of the unsaturated fatty acid to silicon dioxide is (3-10):1.

[0019] Furthermore, the mass ratio of the silicone oil, olefin, alkenyl polyether, and intermediate product is (60-80):(5-10):(30-40):(20-30).

[0020] The core active ingredient of this invention is colloidal sulfur at a concentration as high as 10%. Colloidal sulfur is specially treated sulfur with a very small particle size, allowing it to be uniformly dispersed in the product in a colloidal state. Compared to traditional sulfur, colloidal sulfur has significant advantages. First, its small particle size increases the contact area with the skin, thereby improving the bioavailability and efficacy of the ingredient. Second, colloidal sulfur is less irritating and has a relatively weaker odor, making the product gentler and safe for even sensitive skin. The selection of colloidal sulfur is not only to ensure the product's effectiveness but also to minimize the potential odor issues caused by sulfur itself, thus achieving a good balance between high efficacy and gentleness.

[0021] This invention's oil-controlling skincare colloidal sulfur powder cream features a unique powder-to-cream texture, breaking the traditional limitations of creams, lotions, and pastes in skincare products and providing users with a completely new experience. The product initially exists as a fine powder, resembling freeze-dried powder in appearance but with a silkier feel. Powdered formulations are generally more stable than high-water-content creams or gels, less prone to microbial growth, thus reducing the amount of preservatives needed and improving the product's gentleness. Simultaneously, the powder texture helps absorb excess oil from the skin's surface, which is undoubtedly an added benefit for oily, acne-prone skin. When the powder comes into contact with the skin and is subjected to slight pressure and friction, it quickly transforms into a light, smooth cream texture, promoting absorption and effectively controlling oil and treating acne. Furthermore, unlike traditional acne products that focus on exfoliation or long-term conditioning, this invention's powder cream focuses on improving the appearance of acne in a short time, particularly reducing redness and swelling caused by inflammation. By combining high levels of colloidal sulfur with ingredients such as niacinamide and L-carnitine, a synergistic effect is achieved, further enhancing the effects of oil control, anti-inflammation, and fading acne scars, making it a multi-functional local care product.

[0022] The present invention has the following beneficial effects: This invention discloses an oil-controlling skincare colloidal sulfur powder cream. The oil-controlling skincare colloidal sulfur powder cream uses specific components and processing techniques to obtain a product with a powder-to-cream effect. This invention contains functional ingredients such as colloidal sulfur and niacinamide, which can effectively remove and alleviate acne, improve skin inflammation, and exert oil-controlling effects. The formula of this invention also contains a large amount of silica and kaolin, which, as the main powder components, ensure the product presents a powder state and has a large specific surface area, enabling the adsorption of active ingredients and wetting agents on the surface. During use, this helps to cleanse the skin, remove dirt from pores, and absorb excess oil. In addition, this invention also uses modified silica as a component. This component first introduces unsaturated fatty acids into the surface of silica, and then reacts with olefins, alkenyl polyethers and hydrogen-containing silicone oils. This introduces siloxane, long alkyl and polyether segments into the product surface, giving the modified silica good emulsifying, dispersing and stabilizing effects. This ensures the uniform dispersion of colloidal sulfur, powder and active ingredients. At the same time, the modified silica has good affinity with the powder, which is conducive to promoting the stable adsorption and binding of other components to the powder surface. When used, it is released by kneading, which promotes a smoother phase transition from powder to cream and further improves the storage stability of the product. After long-term storage, it avoids defects such as phase separation and clumping, and can still achieve the function of powder to cream, exerting unique oil control and acne removal effects. Detailed Implementation

[0023] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0024] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0025] It should be understood that, except in any operational instance or otherwise indicated, all figures representing the amounts of ingredients used, for example, in the specification and claims, should be understood to be modified in all cases by the term "about". Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximations varying with the desired performance to be obtained according to the invention.

[0026] The carnitine used in this embodiment of the invention is L-carnitine.

[0027] The preservatives in this embodiment of the invention are chlorophenylenediene, ε-polylysine, and phenoxyethanol in a mass ratio of 2:3:5.

[0028] The silicon dioxide in this embodiment of the invention undergoes an activation treatment, including the following steps: A mixture of concentrated sulfuric acid (98 wt%) and hydrogen peroxide (30 wt%) in a mass ratio of 70:30 was prepared. Nano-silica in a mass ratio of 1:10 was added to the mixture, and the mixture was activated at 80°C for 1 h. The product was obtained by filtration, washing, and drying.

[0029] The method for preparing modified silica in this embodiment of the invention includes the following steps: L1. Toluene and acetone were mixed in a mass ratio of 1:1 to obtain a solvent. The silica was added to the solvent and ultrasonically dispersed for 0.5 h. Then oleic acid was added (the mass ratio of silica, solvent and oleic acid was 1:10:10). The mixture was heated to reflux temperature and reacted for 4 h. After centrifugation, washing and drying, an intermediate product was obtained. L2. Mix 70 g of hydrogen-containing silicone oil (0.25% hydrogen content) and 0.02 g of chloroplatinic acid hexahydrate, and activate at 90°C for 0.5 h under nitrogen protection. Then add 8 g of 1-dodecene, raise the temperature to 110°C and stir for 0.5 h. Then add 0.03 g of chloroplatinic acid hexahydrate and 38 g of alkenyl polyether (allyl polyethylene glycol APEG-500), and continue stirring at 110°C for 3 h. Finally, add 0.03 g of chloroplatinic acid hexahydrate and 30 g of intermediate product and continue the reaction for 3 h. After filtration, wash and dry to obtain modified silica.

[0030] The raw materials and ingredients in the embodiments of this invention have all met the standards for cosmetic raw materials after testing.

[0031] Example 1 An oil-controlling skincare colloidal sulfur powder cream, wherein the oil-controlling skincare colloidal sulfur powder cream comprises the following ingredients by mass fraction: 10% sulfur 24% Kaolin 20% silicon dioxide Acacia gum 8% 15% glycerin 10% propylene glycol 3% nicotinamide Carnitine 1% Citric acid 0.1% Sodium citrate 0.2% Ethylhexylglycerin 0.5% 1% preservative Water balance; The preparation method of the oil-controlling skincare colloidal sulfur powder cream includes the following steps: S1. According to the above mass fraction, add water, glycerin and propylene glycol to a mixing tank, heat to 50°C, then add acacia gum, stir for 0.5-1 h to dissolve, keep warm and add nicotinamide, carnitine, citric acid and sodium citrate, cool to 35°C, add ethylhexylglycerin and preservative, stir evenly to obtain the glue solution. S2. The sulfur raw material is processed to D90 < 15 μm using an air jet mill. Sulfur, kaolin, and silica are added to a high-efficiency three-dimensional mixer and mixed for 0.5 h to obtain powder. The powder is then transferred to a fluidized bed granulator and granulated by spraying the colloid solution (control parameters: inlet air temperature 50℃, atomization pressure 0.2 MPa, spraying speed 400 mL / min). After granulation, the powder is fluidized and dried at 40℃ until the moisture content is 2-3%. Then, it is granulated by passing it through a 24-mesh vibrating screen to remove excessively large particles and fine powder. After that, it is allowed to stand and mature for 12 h at room temperature with a relative humidity of 25%. Finally, it is mixed and homogenized at low speed in a double cone mixer for 0.5 h to obtain an oil-controlling and skin-care colloidal sulfur powder cream.

[0032] Example 2 An oil-controlling skincare colloidal sulfur powder cream, wherein the oil-controlling skincare colloidal sulfur powder cream comprises the following ingredients by mass fraction: 10% sulfur 24% Kaolin 17% silicon dioxide 3% modified silica Acacia gum 8% 15% glycerin 10% propylene glycol 3% nicotinamide Carnitine 1% Citric acid 0.1% Sodium citrate 0.2% Ethylhexylglycerin 0.5% 1% preservative Water balance; The preparation method of the oil-controlling skincare colloidal sulfur powder cream includes the following steps: S1. According to the above mass fraction, add water, glycerin and propylene glycol to a mixing tank, heat to 50°C, then add acacia gum, stir for 0.5-1 h to dissolve, keep warm and add nicotinamide, carnitine, citric acid and sodium citrate, cool to 35°C, add ethylhexylglycerin and preservative, stir evenly to obtain the glue solution. S2. The sulfur raw material is processed to D90 < 15 μm using an air jet mill. Sulfur, kaolin, modified silica, and silica are added to a high-efficiency three-dimensional mixer and mixed for 0.5 h to obtain powder. The powder is then transferred to a fluidized bed granulator and granulated by spraying the adhesive solution (control parameters: inlet air temperature 50℃, atomization pressure 0.2 MPa, spraying speed 400 mL / min). After granulation, the powder is fluidized and dried at 40℃ until the moisture content is 2-3%. Then, it is granulated by passing it through a 24-mesh vibrating screen to remove excessively large particles and fine powder. After that, it is allowed to stand and mature for 12 h at room temperature with a relative humidity of 25%. Finally, it is mixed and homogenized at low speed in a double cone mixer for 0.5 h to obtain an oil-controlling and skin-care colloidal sulfur powder cream.

[0033] Example 3 An oil-controlling skincare colloidal sulfur powder cream, wherein the oil-controlling skincare colloidal sulfur powder cream comprises the following ingredients by mass fraction: 9% sulfur 22% Kaolin 16% silicon dioxide 3% modified silica Acacia gum 6% 15% glycerin 10% propylene glycol 3% nicotinamide Carnitine 1% Citric acid 0.1% Sodium citrate 0.2% Ethylhexylglycerin 0.5% 1% preservative Water balance; The preparation method of the oil-controlling skincare colloidal sulfur powder cream includes the following steps: S1. According to the above mass fraction, add water, glycerin and propylene glycol to a mixing tank, heat to 50°C, then add acacia gum, stir for 0.5-1 h to dissolve, keep warm and add nicotinamide, carnitine, citric acid and sodium citrate, cool to 35°C, add ethylhexylglycerin and preservative, stir evenly to obtain the glue solution. S2. The sulfur raw material is processed to D90 < 15 μm using an air jet mill. Sulfur, kaolin, modified silica, and silica are added to a high-efficiency three-dimensional mixer and mixed for 0.5 h to obtain powder. The powder is then transferred to a fluidized bed granulator and granulated by spraying the adhesive solution (control parameters: inlet air temperature 50℃, atomization pressure 0.3 MPa, spraying speed 200 mL / min). After granulation, the powder is fluidized and dried at 40℃ until the moisture content is 2-3%. Then, it is granulated by passing it through a 24-mesh vibrating screen to remove excessively large particles and fine powder. After that, it is allowed to stand and mature for 12 h at room temperature with a relative humidity of 25%. Finally, it is mixed and homogenized at low speed in a double cone mixer for 0.5 h to obtain an oil-controlling and skin-care colloidal sulfur powder cream.

[0034] Comparative Example 1 The difference between this comparative example and Example 1 is that in step S2, the powder obtained by mixing sulfur, kaolin and silica is directly mixed with the adhesive solution and stirred at 50°C for 1 h. The subsequent drying, granulation, ripening and homogenization are the same as in Example 1.

[0035] Comparative Example 2 The difference between this comparative example and Example 2 is that the modified silica is replaced with an equal mass of intermediate product, while the other components and preparation methods are the same as in Example 2.

[0036] Test Example 1 Stability testing.

[0037] Test method: The samples were sealed in transparent containers and kept at different temperatures (5℃, 25℃, 48℃) for 3 months. Then the samples were taken out to observe the changes in their appearance and to check the odor.

[0038] The test results are shown in Table 1.

[0039] Table 1 Stability Test Results As shown in Table 1, the oil-controlling skincare colloidal sulfur powder cream prepared in Examples 2-3 of this invention exhibits strong stability, maintaining a uniform powder morphology even after long-term storage under different conditions, while ensuring the stability of colloidal sulfur in the system. Example 1, lacking modified silica, was prone to clumping after long-term storage due to the absence of emulsifying and stabilizing components, leading to an increased odor. Comparative Example 1, without spray granulation treatment, did not achieve sufficient adsorption and mixing of powder and moisturizer components, exacerbating the clumping phenomenon. Comparative Example 2 used oleic acid-modified silica to replace the modified silica, increasing hydrophobicity, but its effect on improving system stability was insufficient, and it also easily led to phase separation and clumping problems.

[0040] Test Example 2 Oil control performance test.

[0041] Test method: Fifty volunteers aged 20-30 with oily skin were selected and divided into 5 groups of 10 each. Each group used the samples prepared in Examples 1-3 and Comparative Examples 1-2, respectively, 0.5 g each morning and evening for 30 consecutive days. The amount of sebum secreted by the skin was measured before use on the morning of the first day and 12 hours after use on the evening of the 30th day. The average value of the results for each group was taken.

[0042] The test results are shown in Table 2.

[0043] Table 2 Oil control effect test results As can be seen from Table 2, the oil-controlling skincare colloidal sulfur powder cream of the present invention has good oil-controlling effects. After long-term use, the amount of sebum secretion of the skin is significantly reduced, especially the reduction in Examples 2-3, which is more than 10%. It has good application prospects for oil control, acne removal and skin care.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oil-controlling skincare colloidal sulfur powder cream, characterized in that, The oil-controlling skincare colloidal sulfur powder cream comprises the following ingredients by mass fraction: Sulfur 5-10% Kaolin 15-25% 10-20% silicon dioxide Acacia gum 3-8% Wetting agent 10-25% 2-7% of active ingredients Additives 1-4% Solvent balance.

2. The oil-controlling skincare colloidal sulfur powder cream according to claim 1, characterized in that, It also includes modified silica; The modified silica is obtained by reacting silica with unsaturated fatty acids, silicone oil, olefins and alkenyl polyethylene glycol; The silicone oil is a hydrogen-containing silicone oil.

3. The oil-controlling skincare colloidal sulfur powder cream according to claim 1, characterized in that, The wetting agent includes glycerin and ethylene glycol.

4. The oil-controlling skincare colloidal sulfur powder cream according to claim 1, characterized in that, The active ingredients include nicotinamide and carnitine.

5. The oil-controlling skincare colloidal sulfur powder cream according to claim 1, characterized in that, The additives include pH adjusters, buffers, and preservatives.

6. The method for preparing the oil-controlling skin-care colloidal sulfur powder cream according to any one of claims 1-5, characterized in that, The preparation method of the oil-controlling skincare colloidal sulfur powder cream includes the following steps: S1. Mix the solvent and humectant and heat them. Then add acacia gum, stir to dissolve, and then add the active ingredients and additives to obtain the adhesive solution. S2. After pulverizing the sulfur, mix it with kaolin and silica, then spray granulate it and add it to the adhesive solution. After drying, sieving, aging and homogenizing, an oil-controlling and skin-care colloidal sulfur powder cream is obtained.

7. The preparation method of the oil-controlling skincare colloidal sulfur powder cream according to claim 6, characterized in that, This also includes the preparation of modified silica: L1. Unsaturated fatty acids and silicon dioxide are mixed and heated to react, yielding an intermediate product. L2. Mix silicone oil and catalyst, heat, then add olefins to raise the temperature and react, then add alkenyl polyether to continue the reaction, and finally add intermediate products to continue the reaction to obtain modified silica.

8. The preparation method of the oil-controlling skincare colloidal sulfur powder cream according to claim 7, characterized in that, In step L1, the temperature of the heating reaction is 80-110℃.

9. The preparation method of the oil-controlling skincare colloidal sulfur powder cream according to claim 7, characterized in that, In step L2, the temperature of the heating reaction is 100-120℃.

10. The preparation method of the oil-controlling skincare colloidal sulfur powder cream according to claim 6, characterized in that, After the drying process, the moisture content is 2-3 wt%.

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