Composite film-forming agent as well as preparation method and application thereof

Abstract

The invention discloses a composite film-forming agent as well as a preparation method and application thereof, and aims to provide a composite film-forming agent which can remarkably improve the fitting degree and tensile property of base makeup on the skin surface, enhance the glossiness of the makeup surface, improve the hydration degree of the skin, strengthen the moisturizing effect and form a layer of oleophylic makeup-holding film and a moisturizing film with enhanced hydrophilic capacity. Therefore, a dual film forming effect is achieved; according to the technical scheme, the cleaning agent comprises 4-14% of isododecane; the invention relates to a silicone sealant which is prepared from the following components in percentage by weight: 5 to 40 percent of trimethylsiloxane silicate, 5 to 40 percent of hydrogenated (styrene / methyl styrene) indene copolymer, 30 to 40 percent of cyclopentasiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane, 0 to 12 percent of polyvinyl pyrrolidone, 0 to 1 percent of polyquaternium-51 solution and 10 percent of water, wherein the sum of the components is 100 percent. The invention belongs to the technical field of cosmetics.

Description

Technical Field

[0001] This invention relates to a composite film-forming agent, and also to a method for preparing the composite film-forming agent, belonging to the field of cosmetic technology. Background Technology

[0002] As people's demand for beauty products continues to grow, the cosmetics industry is developing more and more advanced base makeup products. As a crucial step in daily makeup, the performance of base makeup products directly affects the makeup's longevity, naturalness, and skin comfort. While traditional liquid foundations offer some coverage and staying power, their makeup-holding and moisturizing properties still need improvement. Especially when wearing makeup for extended periods or in dry environments, skin is prone to dryness and makeup smudging, affecting the overall makeup effect.

[0003] Therefore, the research and development of base makeup products has always been a hot topic in the industry. For example, CN118845515A proposes a composite film-forming agent and a base makeup cosmetic and its preparation method. The components include: trimethylsiloxysilicate, acrylate / polytrimethylsiloxane methacrylate copolymer, and bis-hydroxyethoxypropylpolydimethylsiloxane / IPDI copolymer urethane. These components work synergistically to significantly improve makeup staying power, achieving a makeup staying factor of approximately 80% after 12 hours, effectively solving the technical problem of poor film-forming agent performance in existing color makeup technologies.

[0004] CN117503640A discloses an anti-dullness base makeup composition, its preparation method, and its application. The anti-dullness base makeup composition comprises the following components by mass fraction: 0.01%–20% functional powder, 0.01%–40% film-forming agent, 0.01%–20% oil-controlling powder, and the balance being polydimethylsiloxane; wherein the functional powder is a mixture of triethoxyoctylsilane, barium sulfate, titanium dioxide, and mica. This invention employs a formulation in which the film-forming agent, oil-controlling powder, and functional powder are mixed in polydimethylsiloxane. This effectively reduces the contact between the base makeup product and the outer air, while simultaneously absorbing oil from the skin's surface, thereby reducing the rate of base makeup dulling and fading, extending the product's effective time, and exhibiting stronger stability and durability. It overcomes the shortcomings of existing technologies and has promising application prospects.

[0005] CN118845515A proposes a composite film-forming agent, a base makeup cosmetic, and its preparation method. The product is composed of trimethylsiloxysilicate, acrylic (ester) / polytrimethylsiloxane methacrylate copolymer, and bis-hydroxyethoxypropyl polydimethylsiloxane / IPDI copolymer urethane. Although this product solves the problem of long-lasting makeup to some extent, all components of the composition are lipophilic and it is difficult to solve the problem of skin dryness after film formation.

[0006] CN117503640A discloses an anti-dullness base makeup composition, its preparation method, and its application, comprising 0.01%–20% functional powder, 0.01%–40% film-forming agent, 0.01%–20% oil-controlling powder, and the balance being polydimethylsiloxane; wherein, the functional powder is a mixture of triethoxyaminosilane, barium sulfate, titanium dioxide, and mica. The components for solving dullness are mainly powder raw materials. Adding too much powder will result in poor spreadability of the base makeup product, and at the same time, excessive powder adsorption of oil will lead to dry skin, thus causing powder to cake.

[0007] In summary, most common film-forming agents in liquid foundations on the market suffer from poor film-forming properties, poor breathability, and a tendency to cause breakouts. While some film-forming agents can improve the staying power of liquid foundation to some extent, they sacrifice skin comfort, and long-term use may have adverse effects on the skin. Summary of the Invention

[0008] To address the aforementioned shortcomings, the first objective of this invention is to provide a composite film-forming agent that can significantly improve the adhesion of base makeup products to the skin, enhance the tensile strength and gloss of the makeup, improve skin hydration, and strengthen moisturizing effects. This agent forms an oil-loving makeup-holding film and a water-loving moisturizing film, i.e., a dual film-forming effect, thereby solving the adverse effects of base makeup products caused by facial expressions, wrinkles, etc.

[0009] A second objective of this invention is to provide a method for preparing the above-mentioned composite film-forming agent, which is simple to operate and operates under mild conditions.

[0010] Another object of the present invention is to provide the application of the above-mentioned composite film-forming agent and its foundation liquid.

[0011] Therefore, the first technical solution provided by this invention is as follows:

[0012] A composite film-forming agent is made from the following components in weight percentage: isododecane 4-14%; trimethylsiloxane silicate 5-40%; hydrogenated (styrene / methylstyrene) indene copolymer 5-40%; cyclopentadimethylsiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane 30-40%; polyvinylpyrrolidone 0%-12%; polyquaternium-51 solution 0-1%; and water 10%, the sum of which is 100%.

[0013] Furthermore, the aforementioned composite film-forming agent is characterized by being made from the following components in the indicated mass percentages: isododecane 4-14%; trimethylsiloxane silicate 5-40%; hydrogenated (styrene / methylstyrene) indene copolymer 5-40%; cyclopentamethoxysiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane 30-40%; polyvinylpyrrolidone 5%-12%; polyquaternium-51 solution 0.2-1%; water 10%, with the sum of all components being 100%.

[0014] Furthermore, in the aforementioned composite film-forming agent, the polyquaternary ammonium salt-51 solution is BIOEXY PQ-51 produced by Shandong Borun Biotechnology Co., Ltd.

[0015] Furthermore, in the aforementioned composite film-forming agent, the cyclopentamethoxysiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane is DOWSIL 5225C FORMULATION AID manufactured by Dow Chemical.

[0016] Furthermore, in the aforementioned composite film-forming agent, the sum of the masses of the trimethylsiloxane silicate, hydrogenated (styrene / methylstyrene) indene copolymer, and polyvinylpyrrolidone accounts for 45% of the total mass of the composite film-forming agent.

[0017] Furthermore, in the above-mentioned composite film-forming agent, the polyvinylpyrrolidone is polyvinylpyrrolidone-K-30.

[0018] The second technical solution provided by this invention is a method for preparing the above-mentioned composite film-forming agent, which includes the following steps in sequence:

[0019] 1) Weigh each component;

[0020] 2) The isododecane weighed in step 1) and the hydrogenated (styrene / methylstyrene) indene copolymer are heated to 110-120℃ to dissolve and become transparent, and then cooled to room temperature, which is recorded as phase A.

[0021] 3) Under stirring conditions, add the cyclopentamethoxysiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane weighed in step 1) to phase A and stir until homogeneous;

[0022] 4) Mix the polyvinylpyrrolidone weighed in step 1) with water, heat to 80-90℃, stir until dissolved and transparent, cool to room temperature, and record as phase B;

[0023] 5) Add the polyquaternium-51 weighed in step 1) to phase B and stir until homogeneous;

[0024] 6) Add the trimethylsiloxane silicate weighed in step 1) to phase A in step 1) under stirring, and stir until dissolved and transparent;

[0025] 7) Under stirring conditions, slowly add phase B to phase A, homogenize the mixture for 10 minutes under homogenization conditions, then homogenize it for 20 minutes using a high-pressure homogenizer. After refining the composite film-forming agent emulsion through a micro-jet device, the composite film-forming agent is obtained.

[0026] The present invention also provides the application of the above-mentioned composite film-forming agent as a foundation additive.

[0027] The present invention also provides a foundation liquid, which is composed of 5-15 wt% of the composite film-forming agent as described in claim 1 and 85-95 wt% of the foundation liquid matrix.

[0028] Compared with the prior art, the present invention has the following beneficial effects.

[0029] 1. The technical solution provided by this invention uses trimethylsiloxane silicate, hydrogenated (styrene / methylstyrene) indene copolymer, and cyclopentamethoxysilane (and) PEG / PPG-18 / 18 polydimethylsiloxane in a specific ratio. The linear silicone-in-water emulsifier is embedded in the spatial structure of trimethylsiloxane silicate, thereby enhancing the film-forming effect during the crosslinking and film-forming process of trimethylsiloxane silicate. Furthermore, the linear silicone-in-water emulsifier contains PEG chains, which can increase the flexibility of the film-forming agent and effectively solve the problems of fragile and weak tensile strength of the film formed by trimethylsiloxane silicate.

[0030] 2. In the technical solution provided by this invention, the film formed by trimethylsiloxane silicate is generally matte. When a good gloss is required in a base makeup formula, the common practice is to add oils with high refractive index to the formula. However, the technical solution provided in this application uses a high-gloss film-forming agent, hydrogenated (styrene / methylstyrene) indene copolymer, which can better avoid the problem of high-refractive index oils migrating and being absorbed on the skin, thus causing changes in the makeup effect.

[0031] 3. The technical solution provided by this invention combines some water molecules of the film-forming agent in the formula with polyvinylpyrrolidone in the form of hydrogen bonds, thereby increasing the film's moisturizing effect and forming a water-containing layer on the makeup surface to resist the evaporation of skin moisture; effectively overcoming the shortcomings of pure oil-based film-forming agents that usually cause the foundation to be thick and dry after film formation, and improving the film's flexibility.

[0032] 4. The technical solution provided by this invention incorporates polyquaternium-51 in the formula, which makes the membrane positively charged and able to bond well with the skin (under normal circumstances, human skin is weakly acidic, and under certain external conditions, the skin generally carries a negative charge, especially in a dry environment), thus solving the problem of incomplete makeup due to dry skin after wearing makeup for a long time.

[0033] 5. The technical solution provided by this invention fully emulsifies the material using a high-pressure homogenizer, allowing the film-forming agent molecules to mix thoroughly. Then, a microfluidic device reduces the emulsion particle size, achieving a uniform and stable state. This process ensures thorough fusion of the components, preventing uneven component distribution and instability during use.

[0034] In summary, the technical solution provided by this invention employs a formulation of isododecane, trimethylsiloxane silicate, hydrogenated styrene / methylstyrene-indene copolymer, polyquaternium-51 solution, PEG / PPG18-18 polydimethylsiloxane, and polyvinylpyrrolidone. This formulation can significantly improve the adhesion of base makeup products to the skin, enhance the tensile strength of base makeup products, resolve adverse effects caused by facial wrinkles, improve the gloss of the makeup, reduce dullness, improve skin hydration, enhance moisturizing effects, and form a dual film-forming effect: an oleophilic makeup-holding film and a hydrophilic moisturizing film. This improves the weather resistance of base makeup products. Attached Figure Description

[0035] Figure 1 The example provided in Example 4 is a VISIA photo taken by a user before applying makeup.

[0036] Figure 2 The technical solution provided in Example 4 allows users to take photos immediately after applying makeup using VISIA.

[0037] Figure 3 This is a VISIA photo taken 8 hours after the user applied makeup, based on the technical solution provided in Example 4.

[0038] Figure 4 The example provided in Example 5 is a VISIA photo taken by a user before applying makeup.

[0039] Figure 5 The technical solution provided in Example 5 allows users to take photos immediately after applying makeup using VISIA.

[0040] Figure 6 This is a VISIA photo taken 8 hours after the user applies makeup, using the technical solution provided in Example 5.

[0041] Figure 7 This is a comparison of the technical solution provided in Application Example 1, showing a user's VISIA photo taken before applying makeup;

[0042] Figure 8 This is a comparison of the technical solution provided in Application Example 1, which allows users to take photos immediately after applying makeup using VISIA.

[0043] Figure 9 The image shown is a VISIA photo taken 8 hours after the user applied makeup, based on the technical solution provided in Example 1. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, preferred embodiments are selected below to further describe the present invention in detail. However, the scope of protection of the present invention is not limited to the scope shown in the embodiments.

[0045] Table 1 shows the raw materials and their sources used in the preparation of composite film-forming agents in Examples 1-12 and Comparative Examples 1-2.

[0046] Table 1

[0047] Raw material serial number Raw material product name INCI factory 1 ISODODECANE Isododecane Ineos Singapore Pte. Ltd. 2 BELSIL® TMS 803 Trimethylsiloxane silicate Wacker Chemie AG 3 R1100 Hydrogenated (styrene / methylstyrene) indene copolymer Eastman 4 DC-5225C Cyclopentadimethylsiloxane (and) PEG / PPG-18 / 18 dimethylsiloxane DOW 5 K-30 Polyvinylpyrrolidone Ashland 6 BIOEXY PQ-51 Polyquaternium-51, water, 1,2-hexanediol Shandong Borun Biotechnology Co., Ltd. 7 Deionized water water self made

[0048] The raw materials and their contents used in the preparation of composite films in Examples 1-12 and Comparative Examples 1-2 are shown in Table 2 below.

[0049] Table 2

[0050] Trimethylsiloxane silicate (%) Hydrogenated (styrene / methylstyrene)indene copolymer (%) Polyvinylpyrrolidone (%) Polyquaternium-51 solution (%) Isododecane (%) Cyclopentadimethylsiloxane (and) PEG / PPG-18 / 18 dimethylsiloxane (%) water(%) Example 1 40 5 0 1 4 40 10 Example 2 30 10 5 1 6 38 10 Example 3 25 15 5 1 8 36 10 Example 4 20 20 5 1 14 30 10 Example 5 18.5 18.5 8 1 10 34 10 Example 6 17.5 17.5 10 1 10 34 10 Example 7 16.6 16.5 12 1 10 33.9 10 Example 8 20 20 5 0.2 10 34.8 10 Example 9 20 20 5 0.5 10 34.5 10 Example 10 5 40 0 1 10 34 10 Example 11 10 30 5 1 10 34 10 Example 12 15 25 5 1 10 34 10 Comparative Example 1 45 0 0 0 10 35 10 Comparative Example 2 0 45 0 0 10 35 10

[0051] The preparation methods of the composite film-forming agents described in Examples 1-12 and Comparative Examples 1-2 are as follows:

[0052] 1) Weigh each component;

[0053] 2) The isododecane weighed in step 1) and the hydrogenated (styrene / methylstyrene) indene copolymer are heated to 110-120℃ to dissolve and become transparent, and then cooled to room temperature, which is recorded as phase A.

[0054] 3) Under stirring conditions, add the cyclopentamethoxysiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane weighed in step 1) to phase A and stir until homogeneous;

[0055] 4) Mix the polyvinylpyrrolidone weighed in step 1) with water, heat to 80-90℃, stir until dissolved and transparent, cool to room temperature, and record as phase B;

[0056] 5) Add the polyquaternium-51 weighed in step 1) to phase B and stir until homogeneous;

[0057] 6) Add the trimethylsiloxane silicate weighed in step 1) to phase A in step 1) under stirring, and stir until dissolved and transparent;

[0058] 7) Under stirring conditions, slowly add phase B to phase A, and homogenize the mixture for 10 minutes. Observe the state of the mixture. If there are no abnormalities, homogenize it for 20 minutes using a high-pressure homogenizer. Then, refine the emulsion at a pressure of 3000 bar using a microjet device to obtain the composite film-forming agent.

[0059] Note: If no component needs to be added during the preparation of the above comparative examples, the corresponding steps can be omitted.

[0060] Application Example 1-12 and Comparative Application Example 1-2 provide a long-lasting makeup foundation, the components and raw materials of which are shown in Table 3.

[0061] The raw materials, their contents, and their sources used in the following examples are shown in Table 3.

[0062] Table 3

[0063] Raw material serial number Raw material product name INICI factory content 1 KF 995 Cyclopentadimethylsiloxane (and) PEG / PPG-18 / 18 dimethylsiloxane Shin-Etsu Silicones(Thailand) Limited 25wt% 2 KF-6038 Lauryl PEG-9 polydimethylsiloxane (and) tocopherol Shin-Etsu Silicones(Thailand) Limited 2.5wt% 3 KF-6017 PEG-10 polydimethylsiloxane Shin-Etsu Silicones(Thailand) Limited 1.2wt% 4 Composite film-forming agent self made 10wt% 5 Mixed color powder / self made 8wt% 6 BENTONE® 38 V CG Distearate dimethylammonium lithium montmorillonite / 1wt% 7 Butylene glycol Butylene glycol / 6wt% 8 Deionized water water self made 43.8wt% 9 Sodium chloride Sodium chloride / 1wt% 10 preservative / / 1.5wt%

[0064] In Table 3, the mixed color powder is composed of CI77891, CI77492, CI77491, and CI77499 mixed in a mass ratio of 9:0.8:0.2:0.1.

[0065] The preservative is composed of butanediol, 1,2-hexanediol and p-hydroxyacetophenone in equal mass ratios.

[0066] The composite film-forming agent is one of the composite film-forming agents provided in Examples 1-12 and Comparative Examples 1-2.

[0067] Application Example 1-12, Comparative Application Example 1-2

[0068] In Application Examples 1-12 and Comparative Application Examples 1-2, the only difference is the composite film-forming agent used; all other components and their contents are the same. The correspondence between the composite film-forming agent and the long-lasting makeup foundation is shown in Table 4.

[0069] Table 4

[0070] Application examples product Film-forming agent Content wt% Application Example 1 Long-lasting foundation 1 The composite film-forming agent provided in Example 1 10 Application Example 2 Long-lasting foundation 2 The composite film-forming agent provided in Example 2 10 Application Example 3 Long-lasting foundation 3 The composite film-forming agent provided in Example 3 10 Application Example 4 Long-lasting foundation 4 The composite film-forming agent provided in Example 4 10 Application Example 5 Long-lasting foundation 5 The composite film-forming agent provided in Example 5 10 Application Example 6 Long-lasting foundation 6 The composite film-forming agent provided in Example 6 10 Application Example 7 Long-lasting foundation 7 The composite film-forming agent provided in Example 7 10 Application Example 8 Long-lasting foundation 8 The composite film-forming agent provided in Example 8 10 Application Example 9 Long-lasting foundation 9 The composite film-forming agent provided in Example 9 10 Application Example 10 Long-lasting foundation 10 The composite film-forming agent provided in Example 10 10 Application Example 11 Long-lasting foundation 11 The composite film-forming agent provided in Example 11 10 Application Example 12 Long-lasting foundation 12 The composite film-forming agent provided in Example 12 10 Comparative Application Example 1 Comparison of long-lasting foundation 1 The composite film-forming agent provided in Comparative Example 1 10 Comparative Application Example 2 Comparison of long-lasting foundation 2 The composite film-forming agent provided in Comparative Example 2 10

[0071] The preparation process is as follows:

[0072] 1) Weigh each component;

[0073] 2) Add raw materials 1-6 (cyclopentamethoxysiloxane (and) PEG / PPG-18 / 18 polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane ethyl polydimethylsiloxane (and) tocopherol, PEG-10 polydimethylsiloxane, composite film-forming agent, distearate dimethylammonium lithium montmorillonite) into a beaker, and label it as the oil phase. Homogenize for 3-5 minutes at room temperature.

[0074] 3) Add raw materials 7-9 (butanediol, deionized water, sodium chloride) to a beaker and stir until dissolved. This is the aqueous phase.

[0075] 4) Add the aqueous phase to the oil phase under stirring conditions, stir until uniform, and homogenize the mixture at an appropriate homogenization speed for 3-5 minutes.

[0076] 5) After homogenization, stir for 10-15 minutes, add raw material No. 10 (preservative), stir for 3 minutes, and complete sample preparation after the physicochemical test is qualified.

[0077] To verify the effectiveness of the technical solution provided in this application, the following are application examples 1-12 and comparative application examples 1-2, performance test experiments of long-lasting makeup foundation liquid and their results.

[0078] I. Makeup-holding performance test

[0079] Expert rating for makeup staying power - Refer to Table 5 for the 8-hour makeup staying power rating criteria.

[0080] Table 5

[0081] Score 1 2 3 4 5 Whiteness Compared to immediately after applying makeup, the skin's whiteness is noticeably worse, the complexion becomes dull, and it loses its luster. Compared to immediately after applying makeup, the skin's whiteness is slightly reduced and the skin tone is slightly darker, but it still maintains a bright appearance. Compared to immediately after applying makeup, there is a slight change in skin whiteness, but it is acceptable, and the overall skin tone is natural. Compared to immediately after applying makeup, there was no significant change in skin whiteness, and skin tone remained stable. Compared to immediately after applying makeup, the skin's whiteness remained unchanged, or even improved, and the skin tone remained good. Uniformity Uniformity 20% uneven Uniformity 40% Uniformity 60% Uniformity 80% 100% uniformity Concealing power With only 20% coverage, there are obvious and numerous flaws, and almost no coverage at all. It has 40% coverage, but has many flaws. It has 60% coverage, but there are some minor flaws. It has 80% coverage and a few minor imperfections. It has 100% coverage and is flawless.

[0082] The evaluation results are shown in Table 6. Figures 1-9 .

[0083] Table 6

[0084] Test Project Whiteness Uniformity Concealing power Application Example 1 2 1 1 Application Example 2 2 2 2 Application Example 3 2 3 1 Application Example 4 4 5 5 Application Example 5 3 4 3 Application Example 6 3 3 3 Application Example 7 3 3 2 Application Example 8 4 4 4 Application Example 9 4 4 4 Application Example 10 4 1 1 Application Example 11 3 2 2 Application Example 12 2 3 2 Comparative Application Example 1 1 1 1 Comparative Application Example 2 3 1 1

[0085] According to Table 5, expert ratings evaluated the product's makeup-holding performance based on three aspects: coverage, evenness, and concealing power. Based on the data in Table 6, comparing it with Table 2, it can be seen that polyvinylpyrrolidone and polyquaternium-51 solution significantly improve film-forming flexibility and adherence. However, trimethylsiloxane silicate, an oil-based film-forming agent, is relatively hard; increasing its amount can worsen powder settling and may create lines on the makeup surface, leading to a lower expert rating. Hydrogenated (styrene / methylstyrene)indene copolymer is an oil-based and flexible film-forming agent that can enhance the formula's flexibility and gloss, simultaneously improving the expert rating. Therefore, the ranking of expert ratings for makeup-holding performance is: Application Example 4 > Application Example 9 ≈ Application Example 8 > Application Example 5 > Application Example 6 > Application Example 7 > Application Example 12 > Application Example 3 > Application Example 11 > Application Example 2 ≈ Application Example 10 > Comparative Application Example 2 > Application Example 1 ≈ Comparative Application Example 1.

[0086] Combination Figure 1-9 VISIA image observation, using the product from Application Example 4 8 hours after makeup application ( Figure 3 ) skin whiteness, evenness, and immediate makeup application ( Figure 2Compared to Example 5, there was almost no change, and the coverage remained at a high level; after 8 hours of makeup application using the product in Example 5 ( Figure 6 Whiteness, evenness, and coverage are all improved with immediate makeup application. Figure 5 Although there was a slight decrease, the overall makeup remained largely intact, with no noticeable powder settling or caking; while the comparison application Example 1, which involved immediate makeup application (…), showed… Figure 8 ) also showed obvious powdery and cakey appearance, even after 8 hours of makeup application ( Figure 9 The makeup showed severe powdering and caking.

[0087] These VISIA image results are highly consistent with the expert rating results in Table 6, which directly confirms that the synergistic effect of each component in the composite film-forming agent has a significant effect on improving the makeup-holding performance of the foundation.

[0088] In summary, it can be seen that the total amount of trimethylsiloxane silicate, hydrogenated (styrene / methylstyrene) indene copolymer, and polyvinylpyrrolidone provided in this application is always maintained at 45%. The reasonable combination of film-forming agents can improve the overall performance of makeup retention.

[0089] II. ΔE value tested by CM-600 / 700d spectrophotometer - 8h makeup retention.

[0090] The test results are shown in Table 7:

[0091] Table 7

[0092]

[0093] ∆E represents the color change of facial skin immediately after makeup application and 8 hours later (the smaller the ∆E value, the smaller the skin color change). Based on the data in Table 7 and comparing it with Table 2, it can be seen that trimethylsiloxane silicate (an oily film-forming agent) has a color-fixing effect; the higher its content, the stronger the color-fixing effect, which can reduce ∆E. Hydrogenated (styrene / methylstyrene) indene copolymer has an extremely high refractive index, which can improve the film's gloss; increasing its content can reduce the facial color ∆E. Furthermore, polyvinylpyrrolidone and polyquaternium-51 solution have no significant effect on the change in ∆E. Therefore, the ranking of facial skin color change ∆E is as follows: Application Example 4 ≈ Application Example 8 ≈ Application Example 9 > Application Example 11 ≈ Application Example 10 > Application Example 12 ≈ Application Example 5 > Application Example 3 ≈ Application Example 6 > Application Example 2 ≈ Application Example 7 > Application Example 1 > Comparative Application Example 2 > Comparative Application Example 1.

[0094] II. Moisturizing properties

[0095] Moisturizing performance will be evaluated based on the water content of the stratum corneum of the skin, following the standardized procedures outlined in QB / T 4256-2011 "Guidelines for Evaluating the Moisturizing Efficacy of Cosmetics".

[0096] Test participants: 20 people, divided into two groups of 10 people each, aged 25-40.

[0097] Test sites: inner arm, 7 different sites were taken from each person, corresponding to different products in the test group.

[0098] Testing instrument: CM825 probe.

[0099] in:

[0100] The formula for calculating the rate of change is as follows:

[0101]

[0102] The results are shown in Table 8-10.

[0103] Table 8

[0104]

[0105] Table 9

[0106]

[0107] Table 10

[0108]

[0109] Note: P>0.05 indicates no significant difference (ns); * indicates a significant difference at the 0.05 level; ** indicates a significant difference at the 0.01 level; *** indicates a significant difference at the 0.001 level; **** indicates a significant difference at the 0.0001 level. The smaller the P value, the greater the significance of the difference.

[0110] Table 8 shows the stratum corneum moisture content data before and after product use; Table 9 shows the rate of change in stratum corneum moisture content after 4 hours of product use; and Table 10 shows the rate of change in stratum corneum moisture content after 8 hours of product use. Based on the data in Tables 8-10, and comparing with Table 2, it can be seen that higher concentrations of polyvinylpyrrolidone and polyquaternium-51 solution resulted in higher stratum corneum moisture content. Conversely, higher concentrations of trimethylsiloxane silicate (%) resulted in lower stratum corneum moisture content. The concentration of hydrogenated (styrene / methylstyrene)indene copolymer (%) had no significant effect on stratum corneum moisture content. Therefore, the moisturizing performance ranking of each application example and the comparative application example is as follows: Application Example 7 > Application Example 6 > Application Example 5 > Application Example 11 > Application Example 4 ≈ Application Example 9 ≈ Application Example 8 > Application Example 12 > Application Example 3 > Application Example 2 > Application Example 10 ≈ Application Example 1 ≈ Comparative Application Example 1 ≈ Comparative Application Example 2.

Claims

1. A composite film-forming agent, characterized by comprising: Isododecane 4-14%; Trimethylsiloxysilicate 5-40%, Hydrogenated (styrene / methylstyrene) indene copolymer 5-40%, Cyclopentasiloxane (and) PEG / PPG-18 / 18 dimethicone 30-40%, Polyvinylpyrrolidone 0%-12%, Polyquaternium-51 solution 0-1%, Water 10%, the sum of each component is 100%.

2. The film-forming agent according to claim 1, wherein Isododecane 4-14%; Trimethylsiloxysilicate 5-40%, Hydrogenated (styrene / methylstyrene) indene copolymer 5-40%, Cyclopentasiloxane (and) PEG / PPG-18 / 18 dimethicone 30-40%, Polyvinylpyrrolidone 5%-12%, Polyquaternium-51 solution 0.2-1%, Water 10%, the sum of each component is 100%.

3. The film-forming agent according to claim 1, wherein The sum of the mass of the trimethylsiloxysilicate, hydrogenated (styrene / methylstyrene) indene copolymer, and polyvinylpyrrolidone is 45% of the total mass of the composite film forming agent.

4. The film-forming agent according to claim 1, wherein The polyquaternium-51 solution is BIOEXY PQ-51 produced by Shandong Pluton Biotechnology Co., Ltd.

5. The film-forming agent according to claim 1, wherein The cyclopentasiloxane (and) PEG / PPG-18 / 18 dimethicone is DOWSIL 5225C FORMULATION AID produced by Dow Chemical.

6. The film-forming agent according to claim 1, wherein The polyvinylpyrrolidone is polyvinylpyrrolidone-K-30.

7. The method of claim 1, wherein the composite film forming agent is prepared by the steps of: Sequentially comprising the following steps: 1) weighing each component according to the mass percentage of claim 1; 2) dissolving and transparentizing isododecane and hydrogenated (styrene / methylstyrene) indene copolymer weighed in step 1) by heating to 110-120°C, and then cooling to room temperature, denoted as phase A; 3) adding cyclopentasiloxane (and) PEG / PPG-18 / 18 dimethicone weighed in step 1) to phase A under stirring and stirring uniformly; 4) mixing polyvinylpyrrolidone weighed in step 1) with water, heating to 80-90°C, stirring and dissolving transparently, and cooling to room temperature, denoted as phase B; 5) adding polyquaternium-51 weighed in step 1) to phase B and stirring uniformly; 6) adding trimethylsiloxysilicate weighed in step 1) to phase A of step 1) under stirring and stirring until dissolving and transparentizing; 7) slowly adding phase B to phase A under stirring, homogenizing the mixture under homogenization for 10 minutes, homogenizing for 20 minutes using a high-pressure homogenizer, and refining the composite film forming agent emulsion through a microfluidic device to obtain the composite film forming agent.

8. Application of the composite film forming agent of claim 1 as a foundation liquid additive.

9. A liquid foundation, characterized by Composed of 5-15 wt% of the composite film forming agent of claim 1 and 85-95 wt% of a foundation liquid base.

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