A sunscreen film composition co-assembled with film-forming agent and powder and its application

Abstract

This invention discloses a sunscreen film composition co-assembled with film-forming agents and powders and its application. The composition comprises the following raw materials in parts by weight: 0.5-2.9 parts of trimethylsiloxysilicate, 0.4-2.1 parts of polysiloxane-15, 0.2-1.2 parts of silica, and 0.3-1.4 parts of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer. This invention employs a co-assembly strategy of film-forming agents and powders. By selecting and combining film-forming agents and powders with silicon-oxygen bonding structures, a sunscreen film with tensile strength, friction resistance, and migration resistance is constructed from both molecular and particle dimensions, solving the problems existing in current sunscreen film-forming technologies. At the same time, when the composition is applied to sunscreen products, it can effectively improve the whitening and oily shine of the products.

Description

Technical Field

[0001] This invention relates to the field of cosmetic sunscreens, and in particular to a sunscreen film composition composed of a film-forming agent and powder co-assembled and its application. Technical Background

[0002] Physical sun protection (such as parasols) alone cannot provide comprehensive UV protection because they cannot block light reflected from the ground onto the skin's surface. This has led to a growing demand for sunscreen cosmetics and a growing awareness of sun protection among consumers, making it an essential step in skincare.

[0003] Existing sunscreen products typically require high doses of sunscreen agents to achieve better sun protection. However, the excessive addition of physical and chemical sunscreen agents can lead to skin whitening and noticeable oiliness, respectively. Choosing a suitable film-forming agent can effectively disperse powder and enhance its diffuse reflectance, while simultaneously providing the sunscreen with a long-lasting UV shielding effect. CN116035948A discloses a waterproof and long-lasting film-forming cosmetic composition and its application. By using a specific polyurethane, it effectively prevents secondary emulsification of the formulation upon contact with water after film formation on the skin, significantly enhancing water resistance and film-forming properties. This allows the physical sunscreen agent to be evenly dispersed in the film, thereby effectively extending the sunscreen's longevity. CN115089505A discloses a synergistic film-forming agent composition and its application. The film-forming agent includes at least two of poly(C10-30) alkanol acrylate, triacontadecyl PVP, and trimethylsiloxysilicate. By combining different film-forming agents and utilizing their structural characteristics, a synergistic sun protection effect is achieved, improving water resistance and optimizing formulation performance.

[0004] However, current research on film-forming technology mainly focuses on improving the water resistance and sun protection efficacy of sunscreen films, neglecting the toughness and film-forming strength of the films. When the skin moves or experiences friction, the structure of the sunscreen film on the skin surface can be damaged, resulting in defects in the dense protective network formed by the sunscreen film and its inability to provide long-lasting UV shielding. Sunscreen films with both excellent toughness and film-forming strength can effectively resist the stretching of the skin during movement and external friction. Furthermore, sunscreen films with excellent film-forming strength can effectively anchor the material during the product drying process, reducing the aggregation of powders such as physical sunscreens, thereby forming a uniform sunscreen coating. Studies have shown that a complete and uniform sunscreen film can maximize UV ​​protection efficiency. Therefore, there is an urgent need to develop film-forming technologies that combine excellent toughness and strength to meet consumer demand for sunscreen products. Summary of the Invention

[0005] The purpose of this invention is to provide a sunscreen film composition co-assembled with a film-forming agent and powder, and its application. When the sunscreen film composition of this invention is applied to sunscreen products, it can effectively improve the tensile strength, abrasion resistance, and migration resistance of the sunscreen coating, thereby providing long-lasting and durable UV protection.

[0006] The technical solution of the present invention is a sunscreen film composition co-assembled with film-forming agent and powder, which is composed of the following raw materials in parts by weight: 0.5 to 2.9 parts of trimethylsiloxysilicate, 0.4 to 2.1 parts of polysiloxane-15, 0.2 to 1.2 parts of silica, and 0.3 to 1.4 parts of vinyl polydimethylsiloxane / polymethylsiloxane sesquioxane crosslinked polymer.

[0007] The aforementioned sunscreen film composition, which is a film-forming agent-powder co-assembled, comprises the following raw materials in parts by weight: 0.8 to 2.3 parts of trimethylsiloxysilicate, 0.5 to 1.6 parts of polysiloxane-15, 0.3 to 1.0 parts of silica, and 0.4 to 1.2 parts of vinyl polydimethylsiloxane / polymethylsiloxane sesquioxane crosslinked polymer.

[0008] In the aforementioned sunscreen film composition co-assembled with film-forming agent and powder, the film-forming agent includes trimethylsiloxysilicate and polysiloxane-15.

[0009] In the aforementioned sunscreen film composition co-assembled with film-forming agent and powder, the powder comprises silica and vinyl polydimethylsiloxane / polymethylsiloxane sesquioxane crosslinked polymer.

[0010] In the aforementioned sunscreen film composition assembled from film-forming agent and powder, the silica has a particle size of 6-8 μm and its morphology exhibits a porous microsphere structure.

[0011] In the aforementioned sunscreen film composition co-assembled with film-forming agent and powder, the particle size of the vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer is 4-6 μm, and its morphology presents a multi-level microsphere structure with nano-"tentacles" attached to the surface.

[0012] In the aforementioned sunscreen film composition co-assembled with film-forming agent and powder, both the film-forming agent and the powder have similar silicon-oxygen bonding structures and exhibit high compatibility.

[0013] Preferably, in the aforementioned sunscreen film composition assembled from film-forming agent and powder, the mass ratio of the film-forming agent to the powder is 1:(0.43 to 0.78).

[0014] Preferably, in the aforementioned sunscreen film composition co-assembled with film-forming agent and powder, the mass ratio of trimethylsiloxysilicate to polysiloxane-15 is 1:(0.53-0.86).

[0015] Preferably, in the aforementioned sunscreen film composition co-assembled with film-forming agent and powder, the mass ratio of the vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer to silica is 1:(0.37-0.65).

[0016] A second aspect of the invention provides the use of the sunscreen film composition in the preparation of a sunscreen product, the sunscreen product comprising both the aforementioned sunscreen film composition and additives.

[0017] The aforementioned sunscreen film composition accounts for 2.5 to 8.5% of the mass of the sunscreen product; the additives are additives that can be used in cosmetics, including one or more of sunscreens, emollients, emulsifiers, moisturizers, fillers, thickeners, pH adjusters, preservatives, antioxidants, skin conditioning agents, dispersants, fragrances, and deionized water.

[0018] The method for preparing the sunscreen product includes the following steps:

[0019] Deionized water, thickener, humectant and other water-soluble ingredients are mixed, heated to 75-85°C and stirred evenly to obtain an aqueous mixture;

[0020] The physical sunscreen and some moisturizer are ground evenly to obtain a grinding liquid;

[0021] The abrasive liquid, sunscreen film composition, chemical sunscreen agent, some emollients and other oil-soluble ingredients are mixed, heated to 75-85°C, and stirred evenly to obtain an oil phase mixture;

[0022] Slowly add the aqueous phase mixture to the oil phase mixture, homogenize for 10-15 minutes, and wait for the temperature to drop to 35-40℃. Add preservatives, fragrances and other additives, and stir well.

[0023] Vacuum degassing is performed to obtain the sunscreen product.

[0024] Compared with existing technologies, this invention employs a co-assembly strategy of film-forming agents and powders. By selecting and combining film-forming agents and powders with silicon-oxygen bonding structures, a sunscreen film with tensile strength, friction resistance, and migration resistance is constructed from both molecular and particle dimensions, solving the problems existing in current sunscreen film-forming technologies. Furthermore, when the composition is applied to sunscreen products, it effectively improves the whitening and oily shine phenomena of the products. Specifically:

[0025] This invention uses trimethylsiloxane-15 as a film-forming agent, which can form a relatively hard film on the skin to resist damage to the sunscreen film from external substances. At the same time, it anchors the physical sunscreen particles in the formula, reducing the reduction in sunscreen effect and whitening caused by powder aggregation during the volatilization process. Through selection, it was found that polysiloxane-15, in addition to being a chemical sunscreen agent, also has unique soft film properties. By combining polysiloxane-15 and trimethylsiloxane-15 in a specific ratio to form a soft and hard film, the two exhibit high compatibility due to their similar silicon-oxygen bonding structure. The introduction of polysiloxane-15 can effectively improve the elongation at break of trimethylsiloxane-15, resulting in a sunscreen film with strong elasticity, which shows superior film-forming toughness compared to existing sunscreen film technologies.

[0026] This invention uses porous silica with a particle size of 6–8 μm to enhance the toughness and strength of soft and hard film assemblies. Due to its similar silicon-oxygen bonding structure, it exhibits high compatibility with film-forming agents. Its porous interior can enhance the bonding between polysiloxane-15 and trimethylsiloxysilicate under external force through interlocking, thereby reinforcing the sunscreen film. Simultaneously, it is combined with a 4–6 μm vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer with a silicon-oxygen structure. The rough edges of the nanoparticles of this powder can act as "tentacles" to firmly grasp the film layer provided by the film-forming agent, further enhancing the tensile, abrasion, and migration resistance of the sunscreen film. By selecting two powders with specific structures and morphologies to co-assemble with the film-forming agent, it exhibits significantly enhanced toughness and film strength compared to existing film-forming technologies. Attached Figure Description

[0027] Figure 1 Field emission scanning electron microscope image of a trimethylsiloxysilicate sample after drying and stretching;

[0028] Figure 2 Field emission scanning electron microscope image of polysiloxane-15 sample after drying and stretching;

[0029] Figure 3 Field emission scanning electron microscope image of a compound sample of trimethylsiloxysilicate and polysiloxane-15 after drying and stretching.

[0030] Figure 4 This is a flowchart illustrating the testing process for film toughness in various application examples of the present invention.

[0031] Figure 5 The graph shows the film toughness test results of blank application example, application example 1 and comparative application examples 1 to 4 of the present invention.

[0032] Figure 6 This is a flowchart illustrating the anti-friction test process for various application examples of the present invention;

[0033] Figure 7The figures show the anti-friction test results of blank application examples, application example 1, and comparative application examples 1 to 4 of the present invention.

[0034] Figure 8 The graph shows the anti-migration test results of the blank application example, application example 1, and comparative application examples 1 to 4 of the present invention. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0036] Example 1

[0037] A sunscreen film composition co-assembled with a film-forming agent and powder, wherein, based on the total mass of the sunscreen product, the mass content of trimethylsiloxysilicate is 1.4%, the mass content of polysiloxane-15 is 1.1%, the mass content of silica is 0.6%, and the mass content of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer is 1.0%.

[0038] Example 2

[0039] A sunscreen film composition co-assembled with a film-forming agent and powder, wherein, based on the total mass of the sunscreen product, the mass content of trimethylsiloxysilicate is 1.6%, the mass content of polysiloxane-15 is 1.2%, the mass content of silica is 0.7%, and the mass content of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer is 1.1%.

[0040] Example 3

[0041] A sunscreen film composition co-assembled with a film-forming agent and powder, wherein, based on the total mass of the sunscreen product, the mass content of trimethylsiloxysilicate is 1.3%, the mass content of polysiloxane-15 is 1.1%, the mass content of silica is 0.6%, and the mass content of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer is 1.1%.

[0042] Example 4

[0043] A sunscreen film composition co-assembled with a film-forming agent and powder, wherein, based on the total mass of the sunscreen product, the composition comprises 1.4% by mass of trimethylsiloxysilicate, 0.9% by mass of polysiloxane-15, 0.4% by mass of silica, and 0.8% by mass of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer.

[0044] Example 5

[0045] A sunscreen film composition co-assembled with a film-forming agent and powder, wherein, based on the total mass of the sunscreen product, the mass content of trimethylsiloxysilicate is 1.7%, the mass content of polysiloxane-15 is 1.1%, the mass content of silica is 0.6%, and the mass content of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer is 1.1%.

[0046] Comparative Example 1

[0047] Compared with Example 1, the difference is that trimethylsiloxysilicate is not added to the sunscreen film composition, while the other components and proportions are the same as in Example 1.

[0048] Comparative Example 2

[0049] Compared with Example 1, the difference is that polysiloxane-15 is not added to the sunscreen film composition, while the other components and proportions are the same as in Example 1.

[0050] Comparative Example 3

[0051] Compared with Example 1, the difference is that the sunscreen film composition does not contain silica and vinyl polydimethylsiloxane / polymethylsiloxane sesquioxane crosslinked polymer, while the other components and proportions are the same as in Example 1.

[0052] Comparative Example 4

[0053] Compared with Example 1, the difference is that the silica and vinyl polydimethylsiloxane / polymethylsiloxane sesquioxane crosslinked polymer in the sunscreen film composition are replaced with talc, while the other components and proportions are the same as in Example 1.

[0054] The formulations of the compositions provided in Examples 1-5 and Comparative Examples 1-4 are shown in Table 1.

[0055] Table 1: Specific composition of Examples 1-5 and Comparative Examples 1-4

[0056]

[0057] Application examples

[0058] Application Examples 1-5 provide a sunscreen product, corresponding to the application of the sunscreen film composition in Examples 1-5 in the sunscreen product. The sunscreen film composition in the formula is the composition and proportion described in Examples 1-5, and the specific formula is shown in Table 2.

[0059] Table 2: Specific formulation composition of application examples 1-5

[0060]

[0061]

[0062] The preparation method of the sunscreen products corresponding to Examples 1-5 includes the following steps:

[0063] (1) Mix deionized water, thickener, humectant and other water-soluble components in phase A, heat to 75°C, stir evenly to obtain an aqueous mixture;

[0064] (2) Grind the physical sunscreen and part of the emollient in phase B evenly to obtain a grinding liquid;

[0065] (3) Mix the abrasive liquid, sunscreen film composition, chemical sunscreen agent, some emollient and other oil-soluble components of phase B, heat to 80°C, and stir evenly to obtain an oil phase mixture;

[0066] (4) Slowly add the aqueous phase mixture to the oil phase mixture, homogenize for 10 minutes, wait for the temperature to drop to 38°C, add the C phase component, and stir evenly.

[0067] (5) Vacuum degassing to obtain sunscreen product.

[0068] Comparative application examples

[0069] Comparative Application Examples 1-4 also provide a sunscreen product. The difference between the product and Application Example 1 is that the sunscreen film composition added to the formula is the same as the components and proportions described in Comparative Examples 1-4. The other components, amounts added, and preparation methods in the formula are the same as in Application Example 1.

[0070] Blank application example

[0071] The difference between the blank application example and application example 1 is that no film-forming agent or powder is added to the sunscreen film composition in the formulation, while the other components, addition amounts and preparation methods in the formulation are the same as in application example 1.

[0072] To verify the beneficial effects of the sunscreen film composition co-assembled with film-forming agent and powder described in this invention, the following experiments were conducted.

[0073] 1. Film toughness test

[0074] Before evaluating the film toughness of each application example, the microstructure of trimethylsiloxysilicate (hard film), polysiloxane-15 (soft film), and mixed hard and soft film samples were analyzed. The test method was as follows: an appropriate amount of trimethylsiloxysilicate, polysiloxane-15, and mixed hard and soft film samples were coated on conductive adhesive and dried in a 60°C oven. The dried conductive adhesive was then stretched with the same force, and the microstructure of the stretched samples was observed using a FEIApreo S HiVac field emission scanning electron microscope (SEM) to evaluate the fracture of the soft and hard film samples. Figure 1The image shows a SEM image of trimethylsiloxysilicate after stretching. It can be seen that the film has crisscrossing cracks, indicating that trimethylsiloxysilicate, as a hard film, is a brittle material. When subjected to external tensile force, it is easy to reach the failure strain, resulting in the fragmentation and fracture of the film. Figure 2 SEM images of polysiloxane-15 after stretching were presented. It was found that the film damage mode of polysiloxane-15 was different from that of trimethylsiloxysilicate, showing localized porous fractures (the exposed black area is the conductive adhesive substrate). This was attributed to the fact that although polysiloxane-15, as a soft film, has strong toughness, its own strength is insufficient, which leads to the formation of pores during stretching. Figure 3 The image shows a SEM image of the hard and soft membrane composite sample after stretching. It can be seen that the large area of ​​the membrane remains intact, with only a small number of small pores. This indicates that the combination of polysiloxane-15 and trimethylsiloxysilicate significantly improves the integrity of the film after stretching, and preliminarily verifies the beneficial effect of hard and soft membrane composite on enhancing toughness.

[0075] Next, the film-forming toughness of each application example of the present invention was tested. The test procedure is as follows: Figure 4 As shown, the specific method is as follows: Black elastic rubber of the same specification is used as the test carrier. 0.2g of the sunscreen product corresponding to each application example (Application Examples 1-5, Comparative Application Examples 1-4, and Blank Application Example) is evenly applied to the elastic rubber, with an application area of ​​1.5cm × 4cm. After the coating dries and forms a film, the elastic rubber is stretched laterally to a length of 7.4-7.5cm. After holding for 3 seconds, the appearance of the film is recorded. The presence of holes and cracks in the sunscreen film during the stretching process is observed to evaluate the film-forming toughness of the sunscreen product corresponding to each application example. Based on... Figure 5 The film toughness test results of blank application examples, application example 1, and comparative application examples 1-4 were used to evaluate the degree of coating damage. A 5-point scale was used, where 1 point represents no obvious damage to the film layer and 5 points represents severe damage to the film layer. Any value between 1 and 5 points can be selected. The results are shown in Table 3.

[0076] Table 3: Assessment Results of Coating Damage

[0077] project Application Example 1 Application Example 2 Application Example 3 Application Example 4 Application Example 5 Score 1.3 1.5 1.4 1.3 1.5 project Comparative Application Example 1 Comparative Application Example 2 Comparative Application Example 3 Comparative Application Example 4 Blank application example Score 3.1 2.9 2.4 3.6 4.3

[0078] according to Figure 5As shown in Table 3, the film-forming toughness test results indicate that the blank application example suffered severe damage to the sunscreen coating under stretching, exhibiting dense and obvious cracks. However, application example 1, containing the sunscreen film composition with the specific ratio described in this invention, maintained a uniform and intact coating during stretching, without any holes or cracks. This indicates that the co-assembled sunscreen film constructed by the specific film-forming agent and powder can effectively enhance the toughness of the sunscreen product and resist damage from facial skin movement. When the specific combination in the sunscreen film composition was changed, it was found that the coatings of each comparative application example showed varying degrees of damage. When the hard and soft films were removed, comparative application examples 1 and 2 showed hole and crack-like damage, respectively, which is consistent with the previous SEM images of the hard and soft films. When the powder was removed and replaced, dense spots and pores appeared in the coatings of Comparative Application Example 3 and Comparative Application Example 4, respectively. This indicates that the toughness enhancement effect imparted by the sunscreen film composition is not only due to the action of the film-forming agent, but also because the powder of the specific combination of the present invention can strengthen the film layer and synergistically enhance the film-forming toughness of the sunscreen film, resisting the damage of the sunscreen product to the movement of facial skin.

[0079] 2. Friction Resistance Test

[0080] This invention reflects film strength by performing anti-friction and anti-migration tests. The anti-friction test procedures for each application example are as follows: Figure 6 As shown, the specific test method is as follows: Apply the same amount of sunscreen evenly to the inside of the arm, covering an area of ​​2.5cm × 2.5cm. After leaving it for 15 minutes, rub the area twice with a tissue using the same force. Observe the scratch area at the edge of the area after rubbing and the residue on the tissue surface using a ULM-01 sunscreen camera (the sunscreen area is shown as gray / black). Figure 7 The scratch resistance test results of each application example are used to evaluate the degree of scratches on the coating edge. A 5-point scale is used, where 1 point represents no obvious scratches on the coating edge and 5 points represents severe scratches on the coating edge. Any value between 1 and 5 points can be selected. The results are shown in Table 4.

[0081] Table 4: Evaluation Results of Coating Edge Scratches

[0082] project Application Example 1 Application Example 2 Application Example 3 Application Example 4 Application Example 5 Score 1.4 1.5 1.4 1.4 1.5 project Comparative Application Example 1 Comparative Application Example 2 Comparative Application Example 3 Comparative Application Example 4 Blank application example Score 3.9 2.9 2.6 3.4 4.6

[0083] according to Figure 7As shown in Table 4, the friction test results indicate that in the blank application example, a large amount of sunscreen product was removed when rubbed with a tissue, the coating was severely damaged, and obvious scratches appeared at the edges. However, in application example 1 containing the sunscreen film composition, the initial distribution of the sunscreen coating was well maintained after friction treatment, significantly improving the friction resistance of the film. After removing the hard and soft films, it was found that the coating edges of comparative application examples 1 and 2 also showed different degrees of scratches after friction, and the friction resistance provided by trimethylsiloxysilicate was better than that of polysiloxane-15. When the powder in the sunscreen film composition was removed and replaced, in Comparative Application Examples 3 and 4, a large amount of the coating material was carried away after friction, and scratches appeared at the coating edges. Furthermore, replacing the powder with a silicon-oxygen bonded structure worsened the anti-friction effect of the sunscreen film. This may be due to the poor compatibility of talc with both soft and hard films. During drying, the film-forming agent and talc not only failed to provide good mutual reinforcement, but the poor dispersibility of the powder resulted in a rough film coating. Under friction, the powder was more easily carried away with the sunscreen product, leading to scratches at the edges. These results indicate that the sunscreen film composition exhibits excellent anti-friction performance. This beneficial effect stems from the similar silicon-oxygen bonded structure of the film-forming agent and the film-forming reinforcement effect imparted by the special morphology of the powder.

[0084] 3. Anti-migration test

[0085] This study analyzes the uniformity of sunscreen product distribution during the drying and film-forming process by testing the anti-migration properties of sunscreen products in various application examples, and evaluates the impact of the sunscreen film on film uniformity during evaporation. The test method involves placing two drops (approximately 0.05g) of each application example sunscreen product onto a polymethyl methacrylate (PMMA) plate, spreading it evenly with a scraper, and observing the distribution of the product during evaporation to assess the anti-migration properties of the sunscreen film. Figure 8 The anti-migration test results of each application example are used to evaluate the degree of material aggregation during the volatilization process. A 5-point scale is used, where 1 point represents uniform coating distribution and no obvious material aggregation, and 5 points represents severe material aggregation. Any value can be taken between 1 and 5 points. The results are shown in Table 5.

[0086] Table 5: Evaluation Results of Aggregation Degree During Material Volatilization

[0087] project Application Example 1 Application Example 2 Application Example 3 Application Example 4 Application Example 5 Score 1.4 1.6 1.5 1.5 1.4 project Comparative Application Example 1 Comparative Application Example 2 Comparative Application Example 3 Comparative Application Example 4 Blank application example Score 3.8 2.1 2.5 3.4 4.7

[0088] Figure 8Table 5 shows the anti-migration performance evaluation results for each application example. It can be seen that in the blank application example, the coating distribution cracked during the evaporation process, and the material exhibited severe aggregation, attributed to the lack of anti-migration effect of the sunscreen film during coating evaporation. In contrast, for application example 1 containing the sunscreen film composition, the coating maintained a uniform distribution throughout the drying process, without significant material agglomeration. This indicates that the sunscreen film composition with the specific formulation described in this invention has excellent anti-migration properties, and its structure can highly anchor the coating material during the evaporation process and ensure its uniform distribution. When components in the sunscreen film composition with the specific formulation are removed or replaced, the anti-migration effect imparted by the composition is weakened to varying degrees. The results of the comparative application example 1 show that trimethylsiloxysilicate plays an important role in improving the anti-migration effect of the sunscreen film. The lack of a soft film and specific powder also affects the anti-migration properties of the sunscreen film. After replacing the specific powder with talc, it was found that the material also showed more severe aggregation and cracking during the drying process. This may be because talc does not have a silicon-oxygen structure and has poor compatibility with soft and hard film-forming agents, resulting in the sunscreen film not being able to effectively anchor the powder during the volatilization process, thus causing the talc to migrate with the material. This further demonstrates the key role of powder in improving the anti-migration properties of the sunscreen film. The excellent anti-migration properties of the sunscreen film composition of the present invention are attributed to the combined effect of the film-forming agent and the powder.

[0089] 4. Makeup Effect Evaluation

[0090] Evaluation Method: Five volunteers were randomly selected to try sunscreen products from Application Examples 1-5, Control Application Examples 1-4, and a blank application example. Rubber carriers coated with each application example were prepared for volunteers to directly evaluate the appearance of the sunscreen products after drying. Each volunteer evaluated the degree of whitening and shine of each application example based on their human trial results and their perceived appearance. A 5-point scale was used, with 1 point representing the least noticeable whitening and shine, and 5 points representing the most noticeable whitening and shine. Any value between 1 and 5 was acceptable. The evaluation results for each application example were the average of the five volunteers' scores. The results are shown in Table 6.

[0091] Table 6: Evaluation Results of Whitening and Glossiness in Various Application Examples

[0092] project Application Example 1 Application Example 2 Application Example 3 Application Example 4 Application Example 5 Pale 1.8 1.7 2.1 1.9 1.8 oily sheen 1.6 1.8 1.9 1.8 2.0 project Comparative Application Example 1 Comparative Application Example 2 Comparative Application Example 3 Comparative Application Example 4 Blank application example Pale 2.6 2.3 3.3 3.2 4.3 oily sheen 2.3 2.5 3.4 3.0 4.2

[0093] Based on the volunteers' evaluations of whitening and shine in various application examples, it can be concluded that the improvement effect of the sunscreen film composition on makeup performance mainly stems from the specific combination of powders. Their special morphology enables the powders to exert diffuse reflection properties to achieve a soft-focus effect, reducing the whiteness and shine of the sunscreen product after application. At the same time, the presence of specific film-forming agents in the sunscreen film composition also affects the sensory evaluation results. This is because the selected film-forming agents can anchor the powders they are paired with during the drying and film-forming process, preventing powder agglomeration and deposition, thereby allowing the powders to better exert their soft-focus effect and providing consumers with an ideal sunscreen product experience.

[0094] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A sunscreen film composition co-assembled with a film-forming agent and powder, characterized in that: The product comprises a film-forming agent and a powder, wherein the mass ratio of the film-forming agent to the powder is 1:(0.43~0.78); the film-forming agent comprises trimethylsiloxysilicate and polysiloxane-15, wherein the mass ratio of trimethylsiloxysilicate and polysiloxane-15 is 1:(0.53~0.86); the powder comprises vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer and silica, wherein the mass ratio of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer and silica is 1:(0.37~0.65); The silica has a particle size of 6-8 μm, and the vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer has a particle size of 4-6 μm. Both the film-forming agent and the powder have a silicon-oxygen bonded structure.

2. The sunscreen film composition of film-forming agent-powder co-assembled according to claim 1, characterized in that, The raw material composition includes the following parts by weight: 0.5 to 2.9 parts of trimethylsiloxysilicate, 0.4 to 2.1 parts of polysiloxane-15, 0.2 to 1.2 parts of silica, and 0.3 to 1.4 parts of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer.

3. A sunscreen film composition co-assembled with a film-forming agent and powder according to claim 1 or 2, characterized in that, The raw material composition includes the following parts by weight: 0.8 to 2.3 parts of trimethylsiloxysilicate, 0.5 to 1.6 parts of polysiloxane-15, 0.3 to 1.0 parts of silica, and 0.4 to 1.2 parts of vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer.

4. A sunscreen product, characterized in that: The product includes a sunscreen film composition and additives; the sunscreen film composition is a film-forming agent-powder co-assembled sunscreen film composition according to any one of claims 1-3, and the sunscreen film composition accounts for 2.5-8.5% of the mass of the sunscreen product; the additives include one or more of the following: sunscreen agent, emollient, emulsifier, humectant, filler, thickener, pH adjuster, preservative, antioxidant, skin conditioning agent, dispersant, fragrance, and deionized water.

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