Modified mica, fine powder sunscreen powder and preparation method thereof

Abstract

The present application relates to the technical field of makeup setting products, and specifically discloses a modified mica, a fine-powdered sunscreen powder, and a preparation method thereof. The modified mica comprises: a core material composed of mica / polydimethylsiloxane / triethoxycaprylylsilane, squalane, and meadowfoam seed oil; and a wall material coated on the outer surface of the core material, the raw materials for its preparation including polydimethylsiloxane / vinyl polydimethylsiloxane cross-polymer / silica, trimethylsiloxysilicate, isododecane, and polydimethylsiloxane. The modified mica of the present application can be used to prepare powdered powder, which has the advantages of fine powder and not easy to precipitate, and can improve the problems of coarse powdered powder and easy precipitation of sunscreen.

Description

Technical Field

[0001] The present application relates to the technical field of makeup setting products, and more specifically, to a modified mica, a fine-powdered sunscreen powder and a preparation method thereof. Background Art

[0002] Pressed powder is a mixture of powder and base pressed into a cake-like form. It's primarily used to correct uneven application and patchy areas. In recent years, manufacturers have developed sunscreen pressed powders that also provide sun protection.

[0003] The main ingredients of sunscreen pressed powder include powder, oil, and sunscreen. Sunscreens are mainly divided into two types: sunscreen ingredients and chemical sunscreen ingredients. The addition of different sunscreen ingredients will lead to certain differences in the physical properties of the pressed powder. For example, nano-powders such as mica powder, a physical sunscreen ingredient, can make the pressed powder dry and rough to the touch. Adding large amounts of chemical sunscreen ingredients can cause the pressed powder to become hard, clumping, and unevenly dispersed, leading to sunscreen precipitation. Summary of the Invention

[0004] In order to reduce the problems of coarse powder texture and easy precipitation of sunscreen agents in pressed powder, the present application provides a modified mica, a fine powder texture sunscreen pressed powder and a preparation method thereof.

[0005] In a first aspect, the present application provides a modified mica, which adopts the following technical solution:

[0006] A modified mica, comprising:

[0007] a core material composed of mica / dimethicone / triethoxycaprylylsilane, squalane, and meadowfoam seed oil;

[0008] The wall material is coated on the outer surface of the core material, and its preparation raw materials include polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer / silica, trimethylsiloxysilicate, isododecane, and polydimethylsiloxane.

[0009] By adopting the above technical solution: by using mica to absorb oil components, the oil component squalane has a strong affinity for the skin and can effectively penetrate the skin, and the oil component white meadowfoam seed oil itself has an antioxidant effect, the two give the mica good oiliness; in the wall material, a film-forming component composed of trimethylsiloxysilicate and isododecane is wrapped to give the mica surface a good slippery feel, and polydimethylsiloxane / vinyl polydimethylsiloxane cross-polymer / silica is added to prevent the problem of mica being difficult to push away due to the film-forming agent wrapped, and polydimethylsiloxane dissolves the polymer. In combination with all the above ingredients, a modified mica with good slippery feel, moist powder, and delicate touch is obtained, which reduces the drying of sunscreen in pressed powder and the problem of rough powder in pressed powder, and the modified mica is not easy to precipitate.

[0010] At the same time, modified mica can absorb other sunscreens and other ingredients of powder after the powder solvent evaporates, thereby improving the stability of the powder and reducing the occurrence of sunscreen precipitation problems.

[0011] Optionally, the following components are included in parts by weight:

[0012] Mica / dimethicone / triethoxycaprylylsilane 5-15 parts, squalane 0.1-1 part, meadowfoam seed oil 0.05-0.5 part; dimethicone / vinyl dimethicone crosspolymer / silica 0.1-1 part; trimethylsiloxysilicate 0.05-0.5 part, isododecane 0.5-1.5 parts, dimethicone 0.05-0.5 part.

[0013] By adopting the above technical solution, the properties of the prepared modified mica are optimal, and the usage amount of each component should be within the above range.

[0014] In a second aspect, the present application provides a fine powder sunscreen powder cake, which adopts the following technical solution:

[0015] A fine powder sunscreen powder cake comprising powder, oil, sunscreen, adhesive and isododecane;

[0016] The powder material includes the modified mica mentioned above; the added amount of the modified mica accounts for 17-19% of the total mass of the powder cake.

[0017] By adopting the above technical solution, the current fine powder sunscreen powder has powder, oil and sunscreen as main ingredients. By introducing the modified mica prepared in this application into the powder, it can give the powder better fineness and makeup-setting effect, and adsorb sunscreen, thereby reducing the problem of crystallization of sunscreen in the powder, and increasing the number of crystallizations caused by temperature cycles.

[0018] Optionally, the powder is composed of modified mica, nylon-12, talc / polydimethylsiloxane, silica / polymethylsiloxane, synthetic fluorphlogopite / triethoxyoctylsilane, boron nitride, polymethylsilsesquioxane, calcium aluminum borosilicate / sodium myristoyl glutamate;

[0019] The composition is composed of petrolatum and diisostearyl malate;

[0020] The sunscreen consists of zinc oxide / triethoxycaprylylsilane, titanium dioxide / silica / polydimethylsiloxane, ethylhexyl methoxycinnamate / butylated hydroxytoluene, and hexyl salicylate acetate.

[0021] Optionally, the weight ratio of the modified mica, nylon-12, talc / polydimethylsiloxane, silica / polymethylsiloxane, synthetic fluorphlogopite / triethoxycaprylylsilane, boron nitride, polymethylsilsesquioxane, calcium aluminum borosilicate / sodium myristoyl glutamate is (15-35):(5-15):(20-45):(2-6):(5-15):(1-5):(2-8).

[0022] Optionally, the grease is composed of the following components in percentage by weight:

[0023] Petrolatum 40-60%;

[0024] Diisostearyl Malate 40-60%.

[0025] Optionally, in the powder cake, the weight ratio of the added amount of isododecane to the modified mica is 25:(12.5-13.5).

[0026] By adopting the above technical solution: isododecane is a highly polar solvent, which can improve the dispersion effect of sunscreen and other powders, reduce the agglomeration problem of powder components, and work together with modified mica to reduce the crystallization of sunscreen.

[0027] By controlling the usage amount of isododecane within the above range, the pressed powder is in a loose state before pressing and is easy to shape, and after pressing, the powder is moist and has a better skin feel.

[0028] Optionally, the binder is aluminum stearate.

[0029] By adopting the above technical solution: compared with other adhesives, isododecane and aluminum stearate have a synergistic effect, which can significantly enhance the bonding effect of aluminum stearate and improve the stability of the pressed powder. When the two are used simultaneously in the pressed powder formula, the prepared pressed powder has moderate hardness and small gaps.

[0030] In a third aspect, the present application provides a method for preparing a fine-textured sunscreen powder cake, which adopts the following technical solution:

[0031] A method for preparing a fine powdered sunscreen powder cake comprises the following steps:

[0032] S1. Preparation of raw materials: Mix nylon-12, talc / polydimethylsiloxane, silica / polydimethylsiloxane, synthetic fluorphlogopite / triethoxycaprylylsilane, boron nitride, polymethylsilsesquioxane, aluminum stearate, calcium aluminum borosilicate / sodium myristoyl glutamate, zinc oxide / triethoxycaprylylsilane, titanium dioxide / silica / polydimethylsiloxane to obtain mixture A; mix petrolatum, diisostearyl malate, ethylhexyl methoxycinnamate, ethylhexyl salicylate / butylated hydroxytoluene, and isododecane to obtain mixture B;

[0033] S2. Mixing raw materials: Add mixture A to mixture B, mix well, then add modified mica, mix well, press, and dry to obtain.

[0034] By adopting the above technical solution: the preparation process is simple and efficient, which is conducive to the industrial scale-up of the preparation of pressed powder, and the prepared pressed powder has high fineness, good makeup-setting effect, overall stable powder quality, and the sunscreen agent is not easy to precipitate.

[0035] In summary, this application has the following beneficial effects:

[0036] 1. In this application, mica is adsorbed with grease and coated with a film layer. The grease improves the lubricity and moisturizing properties of the mica, and the film layer imparts a good slippery feel to the mica surface. Silica contained in the film layer reduces the difficulty in spreading the mica due to the coating, thereby producing a modified mica with a fine touch, moist powder, and adsorption properties. This not only reduces the problem of overly dry powder in pressed powder, but also reduces the problem of sunscreen precipitation.

[0037] 2. In this application, by controlling the amount of modified mica used in the pressed powder, not only the pressed powder is made fine and stable, but also the sunscreen is not easy to precipitate crystals;

[0038] 3. In this application, by using isododecane and aluminum stearate, the two have a synergistic effect. Isododecane can significantly increase the viscosity of aluminum stearate. The combination of the two makes the powder cake moderately hard with small gaps, while further improving the fineness and temperature cycle number of the powder cake, and improving the skin feel and stability of the powder cake. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to the embodiments.

[0040] Preparation Examples 1-3, Comparative Preparation Examples 1-5

[0041] A modified mica, the components and their corresponding weights are shown in Table 1, and the specific steps for preparing the modified mica are as follows:

[0042] Mica / polydimethylsiloxane / triethoxycaprylylsilane, squalane, and white meadowfoam seed oil were mixed, stirred and mixed at a speed of 2500 r / min for 1 minute, and the mixing was repeated three times to obtain a core material mixture; isododecane, polydimethylsiloxane, trimethylsiloxysilicate, polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer / silica were mixed to obtain a wall material mixture; the core material mixture was added to the wall material mixture, stirred and mixed at a speed of 2500 r / min for 1 minute, the mixing was repeated three times, and the modified mica was dried at 55°C for 7 hours.

[0043] [Mica / polydimethylsiloxane / triethoxycaprylylsilane were obtained from Shanghai Koufeng Biotechnology Co., Ltd., model UNI-Sericite 2500DAS; polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer / silica were obtained from The Dow Chemical Company, model DOWSIL TM 9701 Cosmetic Powder. 】

[0044] Table 1 Components and their weights (kg) in Preparation Examples 1-3 and Comparative Preparation Examples 1-5

[0045]

[0046]

[0047] Example 1

[0048] A fine powder sunscreen pressed powder, the components and their corresponding weights of which are shown in Table 2, is prepared by the following steps:

[0049] S1. Raw material preparation: Nylon-12, talc / polydimethylsiloxane, silica / polydimethylsiloxane, synthetic fluorphlogopite / triethoxycaprylylsilane, boron nitride, polymethylsilsesquioxane, binder (magnesium stearate), calcium aluminum borosilicate / sodium myristoyl glutamate, zinc oxide / triethoxycaprylylsilane, titanium dioxide / silica / polydimethylsiloxane, CI77891 / aluminum hydroxide / triethoxycaprylylsilane, CI 77491 / triethoxycaprylylsilane, CI 77492 / triethoxycaprylylsilane, CI 77499 / triethoxycaprylylsilane were mixed at a speed of 2500 r / min for 1.5 min, and the mixing was repeated 3 times to obtain a mixture A; petrolatum, diisostearyl malate, ethylhexyl methoxycinnamate / butylated hydroxytoluene, ethylhexyl salicylate, isododecane, and phenoxyethanol / caprylyl glycol were mixed at a speed of 2500 r / min for 2 min to obtain a mixture B;

[0050] S2. Raw material mixing: Add mixture A to mixture B, mix at a speed of 2500 r / min for 1.5 min, repeat mixing twice, then add modified mica, mix at a speed of 2500 r / min for 1 min, repeat mixing twice, press, and dry at 40°C for 9 h to obtain.

[0051] [The modified mica was prepared by Preparation Example 1; CI 77891 / aluminum hydroxide / triethoxycaprylylsilane was obtained from Shanghai Koufeng Biotechnology Co., Ltd., model Ti-18 AS; CI 77491 / triethoxycaprylylsilane was obtained from United Micropowder, model RP-29AS; CI 77492 / triethoxycaprylylsilane was obtained from United Micropowder, model YP-75AS; CI 77499 / triethoxycaprylylsilane was obtained from United Micropowder, model BP-50AS MHT; ethylhexyl methoxycinnamate / butylated hydroxytoluene was obtained from BASF (China) Co., Ltd., model MC80; phenoxyethanol / caprylyl glycol were purchased from Shanghai Qianyi Chemical Co., Ltd., model number Microcare PHG.

[0052] Table 2 Components and their weights (kg) in Examples 1-3 and Comparative Examples 1-2

[0053]

[0054]

[0055]

[0056] Comparative Example 3

[0057] A fine-textured sunscreen powder foundation, which differs from Example 2 in that equal amounts of mica / polydimethylsiloxane / triethoxycaprylylsilane are used instead of modified mica.

[0058] Mica / polydimethylsiloxane / triethoxycaprylylsilane was purchased from Shanghai Koufeng Biotechnology Co., Ltd., model UNI-Sericite 2500DAS.

[0059] Examples 4-5, Comparative Examples 4-8

[0060] A fine powder sunscreen powder foundation, which differs from Example 2 in that the usage of modified mica is shown in Table 3, and an equal amount of the following substances are used instead of the modified mica.

[0061] Table 3 Usage of modified mica in Examples 2, 4, 5 and Comparative Examples 4-8

[0062] Example 2 4 5 \ \ Preparation example of modified mica 1 2 3 \ \ Comparative Example 4 5 6 7 8 Comparative preparation example of modified mica 1 2 3 4 5

[0063] Examples 6-9

[0064] A fine powder sunscreen powder cake, which differs from Example 4 in that the amounts of the components used are different, see Table 4 for details;

[0065] The difference between Examples 6 and 7 and Example 4 is that the amounts of petrolatum and diisostearyl malate used are different, but the total amount of oil remains unchanged.

[0066] The difference between Examples 8 and 9 and Example 4 is that the amount of isododecane used is different.

[0067] Table 4 Components and their weights in Examples 4, 6-9 (kg)

[0068]

[0069]

[0070] Example 10

[0071] A fine powder sunscreen pressed powder, which differs from Example 4 in that the use of the adhesive is different, and an equal amount of aluminum stearate is used instead of magnesium stearate.

[0072] Performance testing

[0073] The following performance tests were performed on the sunscreen powder foundations prepared in the Examples and Comparative Examples. The test results are recorded in Table 5.

[0074] Detection method

[0075] 1. Skin feel test: 18 volunteers were selected, and each of them used the pressed powder in turn and scored the pressed powder's fineness, oil control ability, and makeup staying power according to Table 6. The higher the score, the better the skin feel.

[0076] Table 6 Skin feel evaluation test indicators

[0077]

[0078]

[0079] 2. Stability: Place the powder compact at 50°C for 90 days to see if there are any crystals on the surface. If no crystals are found, place it at -18°C for another 90 days to see if there are any crystals on the surface. If no crystals are found, place it at -18°C to 48°C and record the number of cycles in which crystals are produced. A higher number indicates that the sunscreen in the compact is less likely to precipitate.

[0080] 3. SPF value: tested according to the "Determination Method of Sun Protection Index (SPF Value) of Sunscreen Cosmetics".

[0081] Table 5 Performance test results

[0082]

[0083] As shown in Table 5, the use of the modified mica prepared in Preparation Example 1 in Examples 1-3 resulted in a pressed powder with a fineness of 9.0 or higher, significantly superior to the 7.6 achieved by the pressed powder prepared in Comparative Example 2 using an equal amount of mica in place of the modified mica. Furthermore, the oil control and makeup staying power of the two pressed powders were similar, demonstrating that the modified mica prepared in this application not only ensures excellent makeup setting and staying power, but also significantly improves the fineness and enhances skin feel of the pressed powder. Furthermore, crystallization occurred after six temperature cycles in Examples 1-3, while crystallization occurred after one temperature cycle in Comparative Example 2. This indicates that the use of modified mica significantly improves the stability of the pressed powder and reduces the problem of sunscreen precipitation.

[0084] Analysis suggests this may be due to the modified mica's core material, which absorbs squalane and meadowfoam seed oil, giving it both a firm hold and a soft feel. Furthermore, the wall material, composed of trimethylsiloxysilicate, isododecane, silica, and polydimethylsiloxane, creates a smooth, non-drying surface that spreads easily. This combination of core and wall materials imparts a moist, smooth feel to pressed powder, enhancing its finish. Furthermore, the modified mica absorbs sunscreen, reducing the risk of crystallization.

[0085] The difference between Example 4-5 and Example 2 is that the usage of modified mica is different. Specifically, the usage amounts of the various components in the modified mica are different. The performance of the powder cakes prepared are all better.

[0086] The difference between Comparative Examples 4-8 and Example 2 is that the use of modified mica is different. Specifically, in the preparation process of the modified mica, one of squalane, white meadowfoam seed oil, polydimethylsiloxane, polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer / silica, and trimethylsiloxysilicate is missing, and the performance of the prepared powder cake is reduced, indicating that only when the modified mica has the above components at the same time can the fineness and other properties of the powder cake be improved.

[0087] The difference between Example 10 and Example 4 is that the use of the adhesive is different, which further improves the fineness of the powder cake and the number of temperature cycles. The reason for this may be that, compared with magnesium stearate, isododecane and aluminum stearate have a synergistic effect, significantly enhancing the adhesion of aluminum stearate and the stability of the powder cake. Therefore, the use of both in the powder cake formula not only makes the powder cake in a loose state before pressing for easy molding, but also makes the pressing surface moist, and the powder cake has moderate hardness and small gaps.

[0088] The embodiments are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the embodiments as needed, but as long as they are within the scope of the claims of the present application, they are protected by patent law.

Claims

1. A fine powder sunscreen powder cake, characterized in that: Including powders, oils, sunscreens, adhesives, and isododecane; The powder material includes modified mica; the added amount of the modified mica accounts for 17-19% of the total mass of the powder cake; The modified mica is prepared by mixing 5-15 parts of mica / polydimethylsiloxane / triethoxyoctylsilane, 0.1-1 parts of squalane, and 0.05-0.5 parts of meadowfoam seed oil, and stirring to obtain a core material mixture; mixing 0.5-1.5 parts of isododecane, 0.05-0.5 parts of polydimethylsiloxane, 0.05-0.5 parts of trimethylsiloxysilicate, and 0.1-1 parts of polydimethylsiloxane / vinyl polydimethylsiloxane cross-polymer / silica to obtain a wall material mixture; and adding the core material mixture to the wall material mixture, stirring, and drying to obtain the modified mica.

2. The fine powder sunscreen pressed powder according to claim 1, characterized in that: The powder is composed of modified mica, nylon-12, talc / polydimethylsiloxane, silica / polymethylsiloxane, synthetic fluorphlogopite / triethoxyoctylsilane, boron nitride, polymethylsilsesquioxane, calcium aluminum borosilicate / sodium myristoyl glutamate; The oil is composed of petrolatum and diisostearyl malate; The sunscreen consists of zinc oxide / triethoxycaprylylsilane, titanium dioxide / silica / polydimethylsiloxane, ethylhexyl methoxycinnamate / butylated hydroxytoluene, and hexyl salicylate acetate.

3. The fine powder sunscreen pressed powder according to claim 2, characterized in that: The weight ratio of the modified mica, nylon-12, talc / polydimethylsiloxane, silica / polymethylsiloxane, synthetic fluorphlogopite / triethoxyoctylsilane, boron nitride, polymethylsilsesquioxane, calcium aluminum borosilicate / sodium myristoyl glutamate is: （15-35）:（5-15）:（20-45）:（2-6）:（5-15）:（1-5）:（2-8）:2 or (15-35): (5-15): (20-45): (2-6): (5-15): (1-5): (2-8): 5 Or (15-35): (5-15): (20-45): (2-6): (5-15): (1-5): (2-8):

8.

4. The fine powder sunscreen pressed powder according to claim 1, characterized in that: The grease is composed of the following components in percentage by weight: Petrolatum 40-60%; Diisostearyl Malate 40-60%.

5. The fine powder sunscreen pressed powder according to claim 1, characterized in that: In the powder cake, the weight ratio of the added amount of isododecane to the modified mica is 25:(12.5-13.5).

6. The fine powder sunscreen pressed powder according to claim 1, characterized in that: The binder is aluminum stearate.

7. A method for preparing the fine-textured sunscreen pressed powder according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preparation of raw materials: Mix nylon-12, talc / polydimethylsiloxane, silica / polydimethylsiloxane, synthetic fluorphlogopite / triethoxycaprylylsilane, boron nitride, polymethylsilsesquioxane, aluminum stearate, calcium aluminum borosilicate / sodium myristoyl glutamate, zinc oxide / triethoxycaprylylsilane, and titanium dioxide / silica / polydimethylsiloxane to obtain a mixture A; petrolatum, diisostearyl malate, ethylhexyl methoxycinnamate, ethylhexyl salicylate / butylated hydroxytoluene, and isododecane were mixed to obtain a mixture B; S2. Mixing raw materials: Add mixture A to mixture B, mix well, then add modified mica, mix well, press, and dry to obtain.

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