Oil-absorbing silica which changes color after oil absorption, and a method for producing and use thereof

Abstract

The application relates to the field of inorganic particle preparation, and particularly discloses a silicon stone capable of changing color after oil absorption as well as a preparation method and application thereof. In the application, hydrogenated lecithin is used to coat lithospermum oil, the lithospermum oil is dispersed in a sodium hyaluronate water film, the water film is stably covered on the silicon stone, and then silane modification treatment is carried out, so that the powder is white, the powder is purple when being soaked by silicone oil, and the powder is pink when being soaked by oleic acid. By using the color changing characteristics, the silicon stone can control oil and keep makeup without being dark, and the color changing is further beneficial to brightening skin color, so that the skin color is more uniform.

Description

Technical Field

[0001] This application relates to the field of inorganic particle preparation, and more specifically, to a silica that changes color after absorbing oil, its preparation method, and its application. Background Technology

[0002] Spherical porous silica is often used in makeup to improve skin feel and control oil. However, spherical silica becomes transparent after controlling oil, which makes it unable to achieve long-lasting makeup. How to retain the skin feel and oil control properties of spherical silica while also achieving its makeup-holding ability has become a need.

[0003] The current mainstream improvement solution in the market is to combine spherical silica with soft-focus powder, utilizing the non-absorbent nature of the soft-focus powder to suppress the transparency of silica after absorbing oil. However, this hybrid approach does not fundamentally address the inherent properties of silica, often resulting in unsatisfactory product effects due to the mixing process. Furthermore, due to constantly changing regulations, mainstream soft-focus powders such as PMMA and nylon powder are restricted from use because they are microplastics. Therefore, finding a spherical porous silica that alters the property of becoming transparent after absorbing oil, and further enhances complexion and evens out skin tone, has become a problem to be solved. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a silica that changes color after absorbing oil, its preparation method, and its application.

[0005] In a first aspect, this application provides a silica that changes color after absorbing oil, the raw materials for which are prepared include the following components by weight: Component 1 includes: 100 parts of spherical porous silica; Component 2 includes at least one of hydrolyzed hyaluronic acid, sodium hyaluronate, and zinc hyaluronate, in amounts of 0.5-5 parts; Component 3 includes: hydrogenated lecithin, 1-5 parts Component 4 includes: Comfrey oil, 0.5-5 parts; Component 5 includes at least one of triethoxyoctylsilane and polydimethylsiloxane, in 1-10 parts; The preparation process includes: dispersing component 4 in a solution of component 3 to prepare an emulsion; mixing the emulsion and a solution of component 2 to obtain a mixed solution; dispersing the mixed solution in a dispersion slurry of component 1; then pressing, drying, and pulverizing to obtain a semi-finished product; and treating the semi-finished product with component 5 to obtain silica that changes color after absorbing oil.

[0006] Understandably, component 1 includes: spherical porous silica, 100 parts; this means that the total number of parts of component 1 is 100 parts. If component 1 includes other components besides spherical porous silica, the total number of parts of component 1 is still 100 parts. The weight parts of other components 2-5 also refer to the total weight parts of the corresponding components.

[0007] This application utilizes a colored oily active ingredient, Lithospermum erythrozhizon root extract, to form Lithospermum erythrozhizon oil, which is then coated with hydrogenated lecithin to form an emulsion. This emulsion is then dispersed in a solution of hyaluronic acid derivative to create an emulsion hydrogel membrane. This emulsion hydrogel membrane is then coated onto the surface of spherical porous silica and subjected to hydrophobic treatment. The finished product made using this technology has visible light that cannot pass through to reveal its color because the oily active ingredients are double-layered with hydrogenated lecithin and a hydrogel film. This masks the color of the comfrey root extract, so the appearance remains the white of porous silica. When it is moistened with oil, the oily active ingredients move towards the interface, thus revealing the original purple color of the comfrey root extract. If it is moistened with acidic oils such as sebum, the shikonin in the comfrey root extract will change towards the red hue under acidic conditions, thus showing a flesh-pink color close to human skin tone. It is this dual color-changing effect of silica that solves the transparency problem after silicone oil is moistened, and at the same time can adjust skin tone, thus effectively prolonging the makeup's durability. It can be considered as a second makeup application after oil control, making the makeup not only longer-lasting, but also making the skin tone more radiant after wearing makeup. In addition, shikonin in Lithospermum thorhizon root extract can promote the repair of damaged skin and reduce inflammation and swelling. However, it has poor photostability and is easily photodegraded, leading to its inactivation and fading color after discoloration. By using oil to stabilize and dissolve Lithospermum thorhizon root extract, the oxidation of shikonin is prevented from being precipitated. Furthermore, the encapsulation of hydrogenated lecithin and hyaluronic acid emulsified hydrogel film forms a strengthened physical barrier, which greatly improves the stability of shikonin. This effectively enhances its activity, exerts the color-changing effect, prolongs makeup wear, and improves skin tone plumpness.

[0008] In component 1, spherical porous silica serves as the main ingredient, improving skin feel and achieving oil control. In component 2, at least one of hydrolyzed hyaluronic acid, sodium hyaluronate, and zinc hyaluronate (a hyaluronic acid derivative) in the above proportions can effectively form an emulsified hydrogel film, enhancing the coating effect. Compared to other amphiphilic substances, this application prefers hydrogenated lecithin to coat comfrey oil, achieving a better color-changing effect. Hydrogenated lecithin has a hydrophilic head group and a lipophilic tail group in its structure. The lipophilic tail group is a long, hydrophobic double-chain structure that can spontaneously aggregate on the surface of hydrophobic comfrey oil to form a coating, which has better coating properties than single-chain amphiphilic substances. Its hydrophilic head group ensures that it is dispersed in hyaluronic acid solution. In addition, the hydrogenated lecithin structure is a saturated alkane chain, which is more tightly packed and has a denser coating than natural lecithin molecules containing double bonds. The molecules are also more stable and less prone to oxidation. Therefore, compared with other amphiphilic substances or natural lecithin, this application chose hydrogenated lecithin to achieve better discoloration effect and aging resistance of silica.

[0009] In some embodiments, the molecular weight of the hydrolyzed hyaluronic acid, sodium hyaluronate, or zinc hyaluronate is 200,000-400,000 Da.

[0010] The selection of hydrolyzed hyaluronic acid, sodium hyaluronate, or zinc hyaluronate in this application should facilitate the formation of a stable emulsion hydrogel film and enhance the stability of shikonin. Choosing a hyaluronic acid derivative with a more reasonable molecular weight can optimize performance. If the molecular weight is too small, there is less intermolecular entanglement, resulting in a weak hydrogel film with poor film-forming stability. Conversely, if the molecular weight is too large, there is greater steric hindrance, leading to poor coating density and affecting the stability of shikonin, resulting in a poor skin feel. Therefore, within the aforementioned molecular weight range, a better balance between film-forming stability and shikonin coating effect is achieved.

[0011] In some embodiments, the comfrey oil comprises, by weight percentage, the following components: 0.2-20% comfrey root extract and 80-99.8% oil.

[0012] Preferably, the mass percentage of the Lithospermum erythrozhizon root extract is 8-18%.

[0013] Preferably, the oil includes caprylic / capric triglycerides.

[0014] Caprylic / capric triglycerides possess excellent stability. By dissolving Lithospermum erythrozhizon root extract to form comfrey oil, they effectively enhance the anti-aging properties of shikonin and fully realize its color-changing effect. The optimal mass percentage of Lithospermum erythrozhizon root extract is within the range of 8-18% to achieve a good color-changing effect. Too low a percentage will weaken the color-changing effect, thus diminishing its skin-brightening properties; too high a percentage will result in unstable comfrey oil, poor encapsulation, and potential inactivation, also affecting its color-changing effect.

[0015] In some embodiments, the oil is caprylic / capric triglyceride and isopropyl palmitate in a mass ratio of 8-12:1; more preferably, 10:1.

[0016] The stability of comfrey oil was improved by encapsulating comfrey root extract with oil. Further optimization of the discoloration stability of porous silica was achieved by selecting a mixture of caprylic / capric triglycerides and isopropyl palmitate at a mass ratio of 8-12:1. This may be because both caprylic / capric triglyceride and isopropyl palmitate have a good dissolving effect on shikonin. Among them, caprylic / capric triglyceride is chemically inert and can provide an excellent antioxidant protection barrier for shikonin. Its molecular structure contains medium-long chains (C8-C10). Although isopropyl palmitate has slightly worse oxidative stability than caprylic / capric triglyceride, its molecular structure contains longer carbon chains. The number of carbon atoms in this long chain is close to that of hydrogenated lecithin and is also highly similar to the molecular skeleton of oleic acid. This makes oleic acid more attractive to isopropyl palmitate. When oleic acid wets, it is easier to carry shikonin out of the hydrogel and onto the surface, thus producing color.

[0017] Therefore, when caprylic / capric triglycerides and isopropyl palmitate are co-dissolved in Lithospermum thorhizon root extract to form Lithospermum thorhizon oil, on the one hand, the long chain of isopropyl palmitate and the long chain of hydrogenated lecithin have similar numbers of carbon atoms, making it easier for hydrogenated lecithin to approach the Lithospermum thorhizon oil. On the other hand, the caprylic / capric triglycerides in the oil matrix have a branched molecular structure, which can be more loosely arranged at the oil-water interface, which is more conducive to the insertion of the hydrophobic tail of hydrogenated lecithin. The two work together to achieve stable coating of Lithospermum thorhizon oil by hydrogenated lecithin, and the coating effect is good. On the other hand, the coated caprylic / capric triglycerides play a stable antioxidant protective barrier role, maintaining the long-lasting effectiveness of shikonin, while isopropyl palmitate helps to optimize the color development of shikonin desorption from the hydrogel membrane, so that the prepared porous silica has better color change stability.

[0018] The optimal color-changing stability was achieved when the mass ratio of caprylic / capric triglyceride to isopropyl palmitate was 8-12:1. Insufficient isopropyl palmitate reduced the attraction to hydrogenated lecithin, affecting coating and deteriorating the surface enrichment and color-changing effect after oleic acid impregnation. Conversely, excessive isopropyl palmitate and insufficient caprylic / capric triglyceride reduced the antioxidant properties of comfrey oil, and the excessive and densely packed mono-chain isopropyl palmitate also hindered the orderly arrangement of hydrogenated lecithin, thus affecting coating. Therefore, the oil-to-oil ratio specified in this application yielded the best results.

[0019] In some embodiments, component 2 is sodium hyaluronate and aminopropanol ascorbate phosphate.

[0020] Preferably, the mass percentage of aminopropanol ascorbate phosphate is 3-8% based on the total mass of component 2.

[0021] Component 2 is a crucial component in the formation of the emulsified hydrogel film. Hyaluronic acid derivatives such as hydrolyzed hyaluronic acid, sodium hyaluronate, and zinc hyaluronate are all excellent choices for film formation. In the development of color-changing silica, the inventors further used sodium hyaluronate and aminopropanol ascorbate phosphate together as component 2. Sodium hyaluronate accounts for over 90% to ensure effective film formation, while a small amount of aminopropanol ascorbate phosphate replacing sodium hyaluronate not only did not affect the film but also unexpectedly improved color-changing stability. The inventors believe this may be due to several factors. First, the hydrogen bonding between aminopropanol ascorbate phosphate and hyaluronic acid enhances the cohesiveness of the hydrogel film. Furthermore, the presence of phosphate ester structures in the film facilitates the stable and uniform dispersion of hydrogenated lecithin-encapsulated comfrey oil within the water film, preventing detachment and aggregation. This also helps the water film spread and adhere better to the silica surface, thus promoting initial encapsulation and subsequent color stability. Second, the dispersion of aminopropanol ascorbate phosphate in the water film helps scavenge free radicals, protecting comfrey extract and preventing oxidation or inactivation. Comfrey extract's stability is effectively enhanced through multi-layer encapsulation and the synergistic antioxidant effect of aminopropanol ascorbate phosphate. Additionally, aminopropanol ascorbate phosphate's whitening and brightening properties, combined with the soothing, repairing, and skin-brightening effects of comfrey extract, further enhance the efficacy of cosmetic products.

[0022] Secondly, this application provides a method for preparing silica that changes color after absorbing oil, comprising the raw materials described in the first aspect, thus possessing the corresponding excellent effect of silica that changes color after absorbing oil as described in the first aspect. The preparation method includes the following steps: Step 1: Dissolve component 2 in 30-50 times its own weight in deionized water at 50-80℃, and stir thoroughly to obtain a solution; Step 2: Dissolve component 3 in 5-15 times its own weight of deionized water at 50-80℃ to prepare a solution, then add component 4 to the solution and stir thoroughly for 20-40 minutes to prepare an emulsion. Step 3: Mix the emulsion obtained in Step 2 with the solution obtained in Step 1, stir until they are evenly mixed, and control the temperature at 50-80℃. Step 4: Add 5-10 times its own weight of 50-80℃ deionized water to component 1, mix and stir evenly to form a dispersion slurry, and disperse at a speed of 1500-2500 rpm to form a vortex. Step 5: Add the mixture obtained in Step 3 into the vortex-forming dispersion slurry for dispersion. Disperse at a temperature of 50-80℃ and a rotation speed of 2000-3000 rpm for 20-50 minutes to make it uniformly mixed to obtain a slurry. Step 6: Press the slurry to make a filter cake, and then dry it to obtain a dried filter cake; Step 7: The obtained dried filter cake is crushed to obtain a semi-finished product; Step 8: Put the semi-finished product into the high-speed mixing equipment, set the speed to 1500-2000 rpm, and spray component 5 into it using the nozzle; Step 9: Mix for 20-40 minutes, then dry for 8-14 hours to obtain dry powder; Step 10: The obtained dry powder is then pulverized to obtain the finished product.

[0023] Preferably, in step six, the drying process is set to 70-90°C for 10-20 hours, and then the temperature is increased to 95-110°C for another 10-20 hours.

[0024] Thirdly, this application provides an application of silica that changes color after absorbing oil, wherein the silica is used in cosmetic products and the amount added is 20-100% of the total mass of the cosmetic products. Preferably, the amount added is 20-80%.

[0025] The silica in this application that changes color after absorbing oil can effectively control oil and maintain makeup. By utilizing the color-changing properties of powder when it comes into contact with sebum, it can create long-lasting and anti-dullness makeup. The product can be in powder or cream form and is especially suitable for setting cosmetics.

[0026] In summary, this application has at least the following beneficial effects: 1. This application uses hydrogenated lecithin to encapsulate comfrey oil, disperses it in a sodium hyaluronate aqueous film, and then stabilizes it on silica. The powder obtained by silane modification is white. When it is soaked in silicone oil, it turns purple, and when it is soaked in oleic acid, it turns pink. Both color changes effectively brighten the skin tone and make the skin tone more even. At the same time, by utilizing its color-changing properties, it can control oil and prevent the makeup from becoming dull.

[0027] 2. This application improves the stability of comfrey oil by encapsulating comfrey root extract with oil. Further optimization of the discoloration stability of porous silica can be achieved by selecting a mixture of caprylic / capric triglyceride and isopropyl palmitate as the oil and controlling the mass ratio of the two to 8-12:1.

[0028] 3. This application uses hyaluronic acid derivatives and aminopropanol ascorbate phosphate as important components in the formation of emulsion hydrogel films, achieving unexpectedly improved color change stability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the silica that changes color after absorbing oil, as described in Embodiment 1 of this application. Figure 2 This is a photograph of the silica that changed color after absorbing oil, as described in Example 1 of this application. Figure 3 This is an SEM image of the discolored silica after oil absorption, as described in Example 1 of this application. Figure 4 This is a schematic diagram illustrating the color-changing principle of silica that changes color after absorbing oil, as described in this application. Figure 5 This is a diagram of the color change experiment of silica that changes color after absorbing oil, as described in Example 1 of this application. Figure 6 These are physical images of the color change stability experiment 1 of Examples 1-3 of this application; Figure 7 These are physical images of the color change stability experiment 2 of Examples 3 and 4 of this application; Detailed Implementation

[0030] To further aid in understanding the technical solution of the present invention, several specific embodiments are provided to describe the technical solution of the present invention in more detail. All described embodiments are only some embodiments of the present invention, not all of them; embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following embodiments are further illustrations of the present invention, but the present invention is not limited thereto.

[0031] The raw materials used in the embodiments of this application are all conventional commercially available brands, or can be obtained according to conventional processes. The spherical porous silica is SILIA LX-7, sodium hyaluronate HA-TLM 20-40, hydrogenated lecithin is Nikko S-10 from Japan, the root extract of Lithospermum erythrorrhizon is Arnebia euchroma extract from Xinjiang, produced by Guangzhou Luojie Biotechnology Co., Ltd., and the polydimethylsiloxane is Dow Corning PMX-200. Example 1

[0032] Raw material weight parts: Component 1: Spherical porous silica, 100 parts; Component 2: Sodium hyaluronate, 4 parts; Component 3: Hydrogenated lecithin, 2 parts Component 4: Comfrey oil, 1 part; Component 5: Polydimethylsiloxane, 5 parts; The oil is composed of 10% (by weight) Lithospermum erythrozhizon root extract and 90% caprylic / capric triglyceride mixture. Processing methods Step 1: Dissolve component 2 in 40 times its own weight of deionized water at 65°C, and stir thoroughly to obtain a solution; Step 2: Dissolve component 3 in 10 times its own weight of 65°C deionized water to prepare a solution. Set the stirrer to 2000 rpm, add component 4, and stir thoroughly for 30 minutes. Use a water bath to maintain the temperature at 65°C to prepare an emulsion.

[0033] Step 3: Mix the emulsion obtained in Step 2 with the solution in Step 1, stir until they are evenly mixed to obtain a mixture, and control the temperature at 65℃.

[0034] Step 4: Add 8 times its own weight of 65°C deionized water to component 1, mix and stir evenly to make a dispersion slurry, control the temperature at 65°C, and disperse it in a disperser at 2000 rpm to form a vortex. Step 5: Add the mixture obtained in Step 3 into the dispersion slurry and disperse it at 65℃ and 2500rpm for 30 minutes to make it evenly mixed and obtain the slurry.

[0035] Step 6: Press the slurry to make filter cake, and put it into a hot air circulating oven for drying. Set the drying temperature to 80℃ for 15 hours, then increase the temperature to 105℃ and dry for another 15 hours.

[0036] Step 7: The obtained dried filter cake is crushed to obtain a semi-finished product.

[0037] Step 8: Put the semi-finished product into the high-speed mixing equipment, set the speed to 1800 rpm, and spray component 5 into it through the nozzle. This component should be completely added within 60 seconds.

[0038] Step 9: Mix for 30 minutes to finish mixing. Then, put the resulting powder into an oven, set it to 105℃, and dry for 11 hours to obtain the dried powder.

[0039] Step 10: The obtained dry powder is then pulverized to obtain the finished product.

[0040] Appendix Figure 1 This is a schematic diagram of the structure of the silica that changes color after absorbing oil, as shown in Example 1; (Attached) Figure 2 The image shown is of the silica powder that changed color after oil absorption in Example 1. It can be seen that the process described in this application successfully prepared a white powder of color-changing silica, effectively masking the color of the comfrey root extract. (Attached image) Figure 3 This is an SEM image of the silica that changed color after absorbing oil in Example 1. It can be seen that this application successfully obtained coated spherical silica.

[0041] Color change experiment: The silica treated with triethoxyoctylsilane and the silica that changed color after absorbing oil in Example 1 of this application were subjected to color change experiments by being impregnated with D5 silicone oil and oleic acid, respectively. The specific experimental method was as follows: 3g of powder was weighed on a glass plate, and oil was added drop by drop to the powder while stirring with a stainless steel spatula until the powder was completely clumped together.

[0042] Appendix Figure 4 This is a schematic diagram illustrating the color-changing principle. Comfrey oil is lipophilic. When wetted by external agents such as D5 silicone oil and oleic acid, according to the principle of "like dissolves like," the comfrey oil, due to the change in the external wetting environment, will detach from the emulsified hydrogel film and accumulate on the surface of the hydrogel film, thus appearing purple. Because the emulsified hydrogel film contains water, when the oil or external solvent contains acid radicals, the acid radicals ionize, causing the pH of the encapsulating environment to change to acidic, resulting in a flesh-pink color. (Attached) Figure 5 The image shows a color-changing experiment. It can be seen that the silica treated with triethoxyoctylsilane did not achieve a color-changing effect after being soaked in D5 and oleic acid. However, the silica in this application turned purple after being soaked in D5 and turned pink after being soaked in oleic acid. Both colors can effectively brighten the skin tone, making the skin tone more even, and while controlling oil, it can also keep the makeup in place for a long time without dulling.

[0043] In summary, Example 1 of this application successfully prepared a silica powder that changes color after absorbing oil. Example 2

[0044] Raw material weight parts: Component 1: Spherical porous silica, 100 parts; Component 2: Sodium hyaluronate, 4 parts; Component 3: Hydrogenated lecithin, 2 parts Component 4: Comfrey oil, 1 part; Component 5: Polydimethylsiloxane, 5 parts; The oil is a mixture of 10% Lithospermum erythrozhizon root extract and 90% oil (by weight); the oil is a mixture of caprylic / capric triglycerides and isopropyl palmitate in a 1:1 weight ratio. Processing methods Step 1: Dissolve component 2 in 40 times its own weight of deionized water at 65°C, and stir thoroughly to obtain a solution.

[0045] Step 2: Dissolve component 3 in 10 times its own weight of 65°C deionized water to prepare a solution. Set the stirrer to 2000 rpm, add component 4, and stir thoroughly for 30 minutes. Use a water bath to maintain the temperature at 65°C to prepare an emulsion.

[0046] Step 3: Mix the emulsion obtained in Step 2 with the solution in Step 1, stir until they are evenly mixed to obtain a mixture, and control the temperature at 65℃.

[0047] Step 4: Add 8 times its own weight of 65°C deionized water to component 1, mix and stir evenly to make a dispersion slurry, control the temperature at 65°C, and disperse it in a disperser at 2000 rpm to form a vortex. Step 5: Add the mixture obtained in Step 3 into the dispersion slurry and disperse it at 65℃ and 2500rpm for 30 minutes to make it evenly mixed and obtain the slurry.

[0048] Step 6: Press the slurry to make filter cake, and put it into a hot air circulating oven for drying. Set the drying temperature to 80℃ for 15 hours, then increase the temperature to 105℃ and dry for another 15 hours.

[0049] Step 7: The obtained dried filter cake is crushed to obtain a semi-finished product.

[0050] Step 8: Put the semi-finished product into the high-speed mixing equipment, set the speed to 1800 rpm, and spray component 5 into it through the nozzle. This component should be completely added within 60 seconds.

[0051] Step 9: Mix for 30 minutes to finish mixing. Then, put the resulting powder into an oven, set it to 105℃, and dry for 11 hours to obtain the dried powder.

[0052] Step 10: The obtained dry powder is then pulverized to obtain the finished product. Example 3

[0053] Raw material weight parts: Component 1: Spherical porous silica, 100 parts; Component 2: Sodium hyaluronate, 4 parts; Component 3: Hydrogenated lecithin, 2 parts Component 4: Comfrey oil, 1 part; Component 5: Polydimethylsiloxane, 5 parts; The oil is a mixture of 10% Lithospermum erythrozhizon root extract and 90% oil (by weight); the oil is a mixture of caprylic / capric triglyceride and isopropyl palmitate in a weight ratio of 10:1. Processing methods Step 1: Dissolve component 2 in 40 times its own weight of deionized water at 65°C, and stir thoroughly to obtain a solution.

[0054] Step 2: Dissolve component 3 in 10 times its own weight of 65°C deionized water to prepare a solution. Set the stirrer to 2000 rpm, add component 4, and stir thoroughly for 30 minutes. Use a water bath to maintain the temperature at 65°C to prepare an emulsion.

[0055] Step 3: Mix the emulsion obtained in Step 2 with the solution in Step 1, stir until they are evenly mixed to obtain a mixture, and control the temperature at 65℃.

[0056] Step 4: Add 8 times its own weight of 65°C deionized water to component 1, mix and stir evenly to make a dispersion slurry, control the temperature at 65°C, and disperse it in a disperser at 2000 rpm to form a vortex. Step 5: Add the mixture obtained in Step 3 into the dispersion slurry and disperse it at 65℃ and 2500rpm for 30 minutes to make it evenly mixed and obtain the slurry.

[0057] Step 6: Press the slurry to make filter cake, and put it into a hot air circulating oven for drying. Set the drying temperature to 80℃ for 15 hours, then increase the temperature to 105℃ and dry for another 15 hours.

[0058] Step 7: The obtained dried filter cake is crushed to obtain a semi-finished product.

[0059] Step 8: Put the semi-finished product into the high-speed mixing equipment, set the speed to 1800 rpm, and spray component 5 into it through the nozzle. This component should be completely added within 60 seconds.

[0060] Step 9: Mix for 30 minutes to finish mixing. Then, put the resulting powder into an oven, set it to 105℃, and dry for 11 hours to obtain the dried powder.

[0061] Step 10: The obtained dry powder is then pulverized to obtain the finished product. Color change stability experiment 1

[0062] The finished dry powders from Examples 1-3 were continuously irradiated with 1.5KW ultraviolet light for 5 hours, followed by immersion in oleic acid for a color change experiment. 50g of powder was placed in a 500ml beaker, and the work surface was kept dark and sealed. The powder was continuously irradiated under a 1.5KW ultraviolet lamp. The color change experiment procedure was the same as in Example 1. Figure 6 These are experimental diagrams illustrating the color change stability of Examples 1-3. (From...) Figure 6It can be seen that Examples 1-3 can all effectively achieve color change, presenting a flesh-pink effect. Example 1 shows minimal color change before and after irradiation, indicating that this application effectively protects shikonin from light-induced inactivation through multiple effects such as oil dispersion, hydrogenated lecithin coating, and sodium hyaluronate film formation, demonstrating a stable color-changing effect. Furthermore, it can be seen that compared to Example 3, the colors of Examples 1 and 2 are lighter, and Example 2 is also slightly lighter than Example 1. The difference between Examples 1-3 lies only in the different oils in the shikonin oil. When the same mass of oil is used to prepare shikonin oil, the mixed oil with a mass ratio of caprylic / capric triglyceride and isopropyl palmitate of 10:1 exhibits a more significant color-changing effect. This indicates that caprylic / capric triglyceride and isopropyl palmitate, under certain proportions, synergistically improve the color-changing stability of the shikonin from multiple angles, such as protecting shikonin and assisting in surface enrichment after shikonin oil infiltration. Example 4

[0063] Raw material weight parts: Component 1: Spherical porous silica, 100 parts; Component 2: A mixture of sodium hyaluronate and aminopropanol ascorbate phosphate, 4 parts; Component 3: Hydrogenated lecithin, 2 parts Component 4: Comfrey oil, 1 part; Component 5: Polydimethylsiloxane, 5 parts; The oil is a mixture of 10% Lithospermum erythrozhizon root extract and 90% oil (by weight); the oil is a mixture of caprylic / capric triglyceride and isopropyl palmitate in a weight ratio of 10:1. Of which, based on the total mass of component 2, aminopropanol ascorbate phosphate accounts for 5% by mass and sodium hyaluronate accounts for 95%, and the two are physically mixed as component 2.

[0064] Processing methods Step 1: Dissolve component 2 in 40 times its own weight of deionized water at 65°C, and stir thoroughly to obtain a solution.

[0065] Step 2: Dissolve component 3 in 10 times its own weight of 65°C deionized water to prepare a solution. Set the stirrer to 2000 rpm, add component 4, and stir thoroughly for 30 minutes. Use a water bath to maintain the temperature at 65°C to prepare an emulsion.

[0066] Step 3: Mix the emulsion obtained in Step 2 with the solution in Step 1, stir until they are evenly mixed to obtain a mixture, and control the temperature at 65℃.

[0067] Step 4: Add 8 times its own weight of 65°C deionized water to component 1, mix and stir evenly to make a dispersion slurry, control the temperature at 65°C, and disperse it in a disperser at 2000 rpm to form a vortex. Step 5: Add the mixture obtained in Step 3 into the dispersion slurry and disperse it at 65℃ and 2500rpm for 30 minutes to make it evenly mixed and obtain the slurry.

[0068] Step 6: Press the slurry to make filter cake, and put it into a hot air circulating oven for drying. Set the drying temperature to 80℃ for 15 hours, then increase the temperature to 105℃ and dry for another 15 hours.

[0069] Step 7: The obtained dried filter cake is crushed to obtain a semi-finished product.

[0070] Step 8: Put the semi-finished product into the high-speed mixing equipment, set the speed to 1800 rpm, and spray component 5 into it through the nozzle. This component should be completely added within 60 seconds.

[0071] Step 9: Mix for 30 minutes to finish mixing. Then, put the resulting powder into an oven, set it to 105℃, and dry for 11 hours to obtain the dried powder.

[0072] Step 10: The obtained dry powder is then pulverized to obtain the finished product. Color change stability experiment 2

[0073] The finished dry powders from Examples 3 and 4 were placed under natural direct sunlight for two months, and then subjected to a color change experiment by immersion in oleic acid. 50g of the powder was placed in a 500ml beaker, covered with a glass protective cover, and placed under natural sunlight on a sunny operating platform for two months. The color change experiment procedure was the same as in Example 1. Figure 7 These are the color-changing stability test diagrams for Examples 3 and 4. It can be seen that the finished products of Examples 3 and 4 still achieve the color-changing effect after being exposed to natural light for two months, demonstrating the stability of shikonin. Example 4 has a more vibrant color than Example 3, while Example 3's color is slightly lighter than Example 4's. The only difference between Examples 3 and 4 is the composition of component 2, indicating that sodium hyaluronate and aminopropanol ascorbate phosphate are used together as component 2. Sodium hyaluronate accounts for 95% to ensure effective water film formation. A small amount of aminopropanol ascorbate phosphate, if used to replace 5% of sodium hyaluronate, can improve color-changing stability, demonstrating the synergistic effect of both in enhancing the color-changing stability of silica in this application.

[0074] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A type of silica that changes color after absorbing oil, characterized in that, Its preparation raw materials include the following components in parts by weight: Component 1 includes: 100 parts of spherical porous silica; Component 2 includes at least one of hydrolyzed hyaluronic acid, sodium hyaluronate, and zinc hyaluronate, in amounts of 0.5-5 parts; Component 3 includes: hydrogenated lecithin, 1-5 parts Component 4 includes: Comfrey oil, 0.5-5 parts; Component 5 includes at least one of triethoxyoctylsilane and polydimethylsiloxane, in 1-10 parts; The preparation process includes: dispersing component 4 in a solution of component 3 to prepare an emulsion; mixing the emulsion and solution of component 2 to obtain a mixed solution; dispersing the mixed solution in a dispersion slurry of component 1; then pressing, drying, and pulverizing to obtain a semi-finished product; and treating the semi-finished product with component 5 to obtain silica that changes color after absorbing oil.

2. The silica that changes color after absorbing oil according to claim 1, characterized in that, The molecular weight of the hydrolyzed hyaluronic acid, sodium hyaluronate, or zinc hyaluronate is 200,000-400,000 Da.

3. The silica that changes color after absorbing oil according to claim 1, characterized in that, The comfrey oil, based on the total mass of the comfrey oil, comprises the following components by mass percentage: 0.2-20% comfrey root extract and 80-99.8% oil.

4. The silica that changes color after absorbing oil according to claim 3, characterized in that, The root extract of Lithospermum erythrhizon is 8-18% by weight, and / or the oils include caprylic / capric triglycerides.

5. The silica that changes color after absorbing oil according to claim 3, characterized in that, The oil is composed of caprylic / capric triglyceride and isopropyl palmitate in a mass ratio of 8-12:

1.

6. The silica that changes color after absorbing oil according to claim 1, characterized in that, Component 2 is sodium hyaluronate and aminopropanol ascorbate phosphate.

7. The silica that changes color after absorbing oil according to claim 6, characterized in that, The mass percentage of aminopropanol ascorbate phosphate is 3-8% based on the total mass of component 2.

8. A method for preparing silica that changes color after absorbing oil, as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Dissolve component 2 in 30-50 times its own weight in deionized water at 50-80℃, and stir thoroughly to obtain a solution; Step 2: Dissolve component 3 in 5-15 times its own weight of deionized water at 50-80℃ to prepare a solution, then add component 4 to the solution and stir thoroughly for 20-40 minutes to prepare an emulsion. Step 3: Mix the emulsion obtained in Step 2 with the solution obtained in Step 1, stir until they are evenly mixed, and control the temperature at 50-80℃. Step 4: Add 5-10 times its own weight of 50-80℃ deionized water to component 1, mix and stir evenly to form a dispersion slurry, and disperse at a speed of 1500-2500 rpm to form a vortex. Step 5: Add the mixture obtained in Step 3 into the vortex-forming dispersion slurry for dispersion. Disperse at a temperature of 50-80℃ and a rotation speed of 2000-3000 rpm for 20-50 minutes to make it uniformly mixed to obtain a slurry. Step 6: Press the slurry to make a filter cake, and then dry it to obtain a dried filter cake; Step 7: The obtained dried filter cake is crushed to obtain a semi-finished product; Step 8: Put the semi-finished product into the high-speed mixing equipment, set the speed to 1500-2000 rpm, and spray component 5 into it using the nozzle; Step 9: Mix for 20-40 minutes, then dry for 8-14 hours to obtain dry powder; Step 10: The obtained dry powder is then pulverized to obtain the finished product.

9. The method for preparing silica that changes color after absorbing oil according to claim 8, characterized in that, In step six, the drying temperature is set to 70-90℃ for 10-20 hours, and then the temperature is increased to 95-110℃ for another 10-20 hours.

10. An application of silica that changes color after absorbing oil as described in any one of claims 1-8, characterized in that, The silica is used in cosmetic products, and the amount added is 20-100% of the total mass of the cosmetic product.

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