Synergistic film-forming agent composition and application thereof in sunscreen preparation

Abstract

The invention discloses a synergistic film-forming agent composition and application thereof in a sunscreen preparation, and belongs to the technical field of sunscreen cosmetics. According to the synergistic film-forming agent composition, the oily film-forming agent and the water-based film-forming agent are matched, so that a sunscreen product contains the film-forming agents in a water phase and an oil phase, a film formed on skin is more complete, and the sunscreen performance of the sunscreen product is improved.

Description

Technical Field

[0001] This invention relates to the technical field of sunscreen cosmetics, specifically to a synergistic film-forming agent composition and its use in sunscreen formulations. Background Technology

[0002] The sun protection ability of sunscreen products can usually be enhanced through film-forming agents, active ingredients, and sunscreen agents to improve their ability to resist ultraviolet rays. Film-forming agents can enhance sun protection by increasing the time the sunscreen film stays on the skin, improving the uniformity of sunscreen dispersion, and providing waterproof and sweat-proof effects. Active ingredients mainly enhance the sun protection ability by immediately soothing the damage caused by ultraviolet rays and immediately scavenging free radicals. Sunscreen agents rely on their ability to absorb ultraviolet rays to improve the product's sun protection ability; however, the amount of sunscreen agent added is not necessarily better the higher it is, as adding too much sunscreen agent may bring a series of new problems.

[0003] Therefore, achieving higher SPF with less sunscreen agent has become a pressing issue. One approach is to add film-forming agents to allow the sunscreen agents to disperse more evenly and persistently on the skin, thus achieving better protection. For example, CN116035948A discloses a waterproof, long-lasting film-forming cosmetic composition and its application. By using specific polyurethane, it effectively prevents secondary emulsification of the formulation upon contact with water after film formation on the skin, significantly enhancing waterproofness and film-forming properties, and ensuring uniform dispersion of physical sunscreen agents within the film. This improves sun protection by altering the composition of the film-forming agent; however, adding new ingredients may introduce new risks and is generally not easily accepted by consumers in practical applications. Furthermore, currently, adding film-forming agents at low concentrations does not significantly improve SPF. Summary of the Invention

[0004] In response to the lack of effective solutions for improving the SPF of sunscreen products, this invention provides a sunscreen composition that combines oil-based and water-based film-forming agents, ensuring that the sunscreen product contains film-forming agents in both the aqueous and oil phases, resulting in a more complete film formation on the skin and thus improving its sun protection performance.

[0005] This invention discloses a synergistic film-forming agent composition, wherein the film-forming agent comprises an oil-based film-forming agent and an aqueous film-forming agent; the mass ratio of the oil-based film-forming agent to the aqueous film-forming agent is 0.5-6:0.01-1.

[0006] The inventors discovered during their research and development that to improve the performance of sunscreen products, film-forming agents can be added or the amount of sunscreen agent can be increased. However, as the content of sunscreen agent or film-forming agent increases, the product becomes thicker and harder to apply, which also affects the product's sun protection ability.

[0007] This invention, by combining water-soluble and oil-soluble film-forming agents, reduces the amount of sunscreen agent added, lowers the amount of film-forming agent used, improves the application feel of the product, increases product comfort, and reduces product cost. Furthermore, because the aforementioned synergistic film-forming agent composition combines multiple film-forming agents, the sunscreen product contains film-forming agents in both the aqueous and oil phases, resulting in a more complete film formation on the skin. Additionally, using this film-forming agent combination also enhances the product's water and sweat resistance, providing excellent UV protection even when sweating, thus addressing the need for water and sweat resistance in sunscreen products.

[0008] In summary, this invention develops a film-forming agent combination that has enhanced sun protection capabilities, a pleasant skin feel, and waterproof and sweatproof effects by optimizing the combination of aqueous and oil-phase film-forming agents.

[0009] In some embodiments, the mass ratio of the oily film-forming agent to the aqueous film-forming agent is 0.5-4:0.1-0.7, preferably, the mass ratio of the oily film-forming agent to the aqueous film-forming agent is 4:0.5.

[0010] In some embodiments, the oily film-forming agent is selected from one or more of trimethylsiloxysilicate, acrylic (ester) copolymers, VP / eicosene copolymers, triacontyl PVP and poly(C10-30) alkanol acrylates, preferably trimethylsiloxysilicate and acrylic (ester) copolymers, more preferably trimethylsiloxysilicate and acrylic (ester) copolymers in a mass ratio of 0.5-3.5:0.5-3.5, for example, trimethylsiloxysilicate and acrylic (ester) copolymers in a mass ratio of 2:2.

[0011] In some embodiments, the aqueous film-forming agent is selected from one or more of polyvinylpyrrolidone, VP / VA copolymer and VP / acrylate / lauryl methacrylate copolymer, preferably polyvinylpyrrolidone.

[0012] In some embodiments, the synergistic film-forming agent composition is trimethylsiloxysilicate, acrylate copolymer and polyvinylpyrrolidone in a mass ratio of 0.5-3.5:0.5-3.5:0.1-0.7, preferably in a mass ratio of 1-2:1-2:0.3-0.7, and more preferably in a mass ratio of 2:2:0.5.

[0013] On the other hand, the present invention also discloses the use of the above-mentioned synergistic film-forming agent composition in improving the sun protection performance of skin sunscreen formulations, preferably, the sun protection performance is the SPF value.

[0014] On the other hand, the present invention also discloses a sunscreen composition comprising the following raw materials in parts by weight: 16-25 parts of sunscreen agent, 4-8 parts of the above-mentioned synergistic film-forming agent composition, 2-5 parts of emulsifier, and 55.5-83 parts of skin conditioning agent.

[0015] Understandably, the aforementioned skin conditioning agents refer to a general term for ingredients in cosmetics that have effects on the skin, such as whitening, moisturizing, anti-aging, and acne-reducing effects. The specific types or amounts of these ingredients can be adjusted according to needs.

[0016] In some embodiments, the skin conditioning agent is selected from: moisturizers, emollients, and skin feel modifiers;

[0017] The sunscreen agent is 16-23 parts, the film-forming synergist composition is 4-6 parts, the emulsifier is 2-4 parts, the moisturizer is 25-35 parts, the emollient is 35-48 parts, and the skin feel modifier is 0.1-5 parts.

[0018] Preferably, the sunscreen is 16.5-22 parts, the film-forming synergist composition is 4-5 parts, the emulsifier is 2-3 parts, the moisturizer is 28-33 parts, the emollient is 40-45 parts, and the skin feel modifier is 0.5-2 parts.

[0019] More preferably, the sunscreen agent is 18 parts, the film-forming synergist composition is 4.5 parts, the emulsifier is 2 parts, the moisturizer is 31.5 parts, the emollient is 43 parts, and the skin feel modifier is 1 part.

[0020] In some embodiments, the sunscreen agent is selected from one or more of zinc oxide, titanium dioxide, ethylhexyl salicylate and isoamyl p-methoxycinnamate, preferably zinc oxide, more preferably 16.5-22 parts by weight, for example 17-19 parts, and most preferably 18 parts.

[0021] In some embodiments, the emulsifier is selected from one or more of the following: polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, polyglycerol-4 diisostearate / polyhydroxystearate / sebacate, and polyglycerol-2 dihydroxystearate.

[0022] In some embodiments, the emulsifier is a mixture of polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, and polyglycerol-4 diisostearate / polyhydroxystearate / sebacate.

[0023] In some embodiments, the emulsifier is a mixture of polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, and polyglycerol-4 diisostearate / polyhydroxystearate / sebacate in a mass ratio of 0.5-2.5:0.1-1.5:0.1-1.5, for example, a mixture of polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, and polyglycerol-4 diisostearate / polyhydroxystearate / sebacate in a mass ratio of 1:0.5:0.5.

[0024] In some embodiments, the moisturizer is selected from one or more of water, glycerin, butylene glycol, p-hydroxyacetophenone, 1,2-pentanediol, and 1,3-propanediol; preferably, the moisturizer is a mixture of water, glycerin, and p-hydroxyacetophenone; more preferably, the moisturizer is a mixture of water, glycerin, and p-hydroxyacetophenone in a mass ratio of 20-40:1-10:0.1-1.0, for example, a mixture of water, glycerin, and p-hydroxyacetophenone in a mass ratio of 28:3:0.5.

[0025] In some embodiments, the emollient is selected from one or more of polydimethylsiloxane, butyl octyl salicylate, isododecane, octyl polymethylsiloxane, and caprylic / capric triglycerides; preferably, the emollient is a mixture of polydimethylsiloxane, butyl octyl salicylate, isododecane, and octyl polymethylsiloxane; more preferably, the emollient is a mixture of polydimethylsiloxane, butyl octyl salicylate, isododecane, and octyl polymethylsiloxane in a mass ratio of 1-40:1-20:1-10:1-10, for example, a mixture of polydimethylsiloxane, butyl octyl salicylate, isododecane, and octyl polymethylsiloxane in a mass ratio of 25:8:5:5.

[0026] In some embodiments, the skin feel modifier is selected from polymethylsilsesquioxane; preferably, the polymethylsilsesquioxane is present in a weight ratio of 0.5-1.5, for example, 1 part.

[0027] In some embodiments, the sunscreen composition described above comprises the following raw materials in parts by weight: 10-30 parts of polydimethylsiloxane, 1-10 parts of butyl octyl salicylate, 1-10 parts of isododecane, 1-10 parts of octyl polymethylsiloxane, 16.5-22 parts of zinc oxide, 1-8 parts of polymethylsilsesquioxane, 0.5-3.5 parts of trimethylsilkoxysilicate, 0.5-3.5 parts of acrylate copolymer, 0.2-3 parts of polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.1-1 part of lauryl polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.1-1 part of polyglycerol-4 diisostearate / polyhydroxystearate / sebacate, 10-40 parts of water, 1-10 parts of glycerin, 0.1-2 parts of p-hydroxyacetophenone, and 0.1-2 parts of polyvinylpyrrolidone.

[0028] In some embodiments, the sunscreen composition comprises the following raw materials in parts by weight: 25 parts polydimethylsiloxane, 8 parts butyl octyl salicylate, 5 parts isododecane, 5 parts octyl polymethylsiloxane, 18 parts zinc oxide, 1 part polymethylsilsesquioxane, 2 parts trimethylsilkoxysilicate, 2 parts acrylic (ester) copolymer, 1 part polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.5 parts lauryl polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.5 parts polyglycerol-4 diisostearate / polyhydroxystearate / sebate, 28 parts water, 3 parts glycerin, 0.5 parts p-hydroxyacetophenone, and 0.5 parts polyvinylpyrrolidone.

[0029] On the other hand, the present invention also discloses a method for preparing the above-mentioned sunscreen composition, comprising the following steps: mixing sunscreen agent, oil-soluble raw material and emulsifier evenly, adding oil-based film-forming agent, then adding water-soluble raw material and water-based film-forming agent, mixing evenly to obtain the sunscreen composition.

[0030] In some embodiments, the above preparation method includes the following steps:

[0031] Preparation of the first phase: Stir and disperse the sunscreen agent, liquid raw material from the oil-soluble raw material and emulsifier evenly, add the solid raw material from the oil-soluble raw material, mix evenly, then add the oily film-forming agent and disperse evenly to obtain the first phase, for later use;

[0032] Preparation of the second phase: Dissolve the water-soluble raw material evenly, add the water-based film-forming agent, disperse evenly to obtain the second phase, and set aside for later use;

[0033] Mixing: Add the second phase to the first phase and homogenize to obtain the final product.

[0034] In some embodiments, during the preparation of the first phase step, the sunscreen agent, the liquid raw material in the oil-soluble raw material, and the emulsifier are stirred and dispersed at room temperature.

[0035] In some embodiments, during the second phase preparation step, the water-soluble raw material is dissolved uniformly at 80-90°C; furthermore, the second phase is cooled to room temperature for later use.

[0036] In some embodiments, the homogenization conditions in the mixing step are emulsification and homogenization at a homogenization speed of 3000-6000 rpm for 5-15 min.

[0037] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0038] The reagents and raw materials used in this invention are all commercially available.

[0039] The positive and progressive effects of this invention are as follows:

[0040] The synergistic film-forming agent composition of the present invention, when used in sunscreen products, has sun protection enhancement capabilities, can reduce the use of sunscreen agents, improves skin feel, has waterproof effect, and improves product adherence to the skin.

[0041] In particular, it can effectively increase the product's SPF without changing the sunscreen agents, allowing for a reduction in the amount of sunscreen agent used while achieving the same SPF, improving the product's feel on the skin, and saving costs. It also has good water resistance, blocking sweat and extending the product's UV protection time, providing long-lasting sun protection. Detailed Implementation

[0042] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0043] All raw materials used in the following examples are commercially available, for example:

[0044] Polydimethylsiloxane, purchased from Ximei (Shanghai) Chemical Technology Co., Ltd.;

[0045] Butyl octyl salicylate, purchased from Shandong New Future System Integration Co., Ltd.;

[0046] Isododecane, purchased from Shandong New Future System Integration Co., Ltd.;

[0047] Octyl polymethylsiloxane, purchased from Ximei (Shanghai) Chemical Technology Co., Ltd.;

[0048] Zinc oxide, purchased from BASF (China) Co., Ltd.

[0049] Polymethylsilsesquioxane, with an average particle size of 3-7 μm, was purchased from Shanghai Tushang Industrial Co., Ltd.

[0050] Trimethylsilyloxysilicate was purchased from Ximei (Shanghai) Chemical Technology Co., Ltd.

[0051] VP / eicosene copolymer (CAS: 28211-18-9) was purchased from Shanghai Baihaobo Biotechnology Co., Ltd.

[0052] Triacontaneyl PVP (CAS: 136445-69-7) was purchased from Shandong New Future System Integration Co., Ltd.

[0053] Poly(C10-30) alkyl acrylate was purchased from Ximei (Shanghai) Chemical Technology Co., Ltd.

[0054] Acrylic (ester) copolymers, AvoBrite, HallStar Corporation;

[0055] Polyglycerol-3-dimethylsilylhydroxyethyl polydimethylsiloxane, listed as ingredient No. 03833 in the Catalogue of Cosmetic Raw Materials Used in China (IECIC), was purchased from Shandong New Future System Integration Co., Ltd.

[0056] Lauryl polyglycerol-3-dimethylsiloxane, ingredient number 08370 in the China Catalogue of Used Cosmetic Ingredients (IECIC), purchased from KCC SILICONE CORPORATION;

[0057] Polyglycerol-4 diisostearate / polyhydroxystearate / sepiacetate, ingredient number 03844 in the China Catalogue of Used Cosmetic Ingredients (IECIC), purchased from Shandong New Future System Integration Co., Ltd.

[0058] Glycerin, purchased from Mustim Mas;

[0059] p-Hydroxyacetophenone was purchased from Shanghai Haotai Biotechnology Co., Ltd.

[0060] Polyvinylpyrrolidone (PVP) was purchased from Shanghai Baihaobo Biotechnology Co., Ltd.

[0061] Example 1

[0062] This embodiment prepares different sunscreen liquids and screens and compares the sunscreen liquid formulations.

[0063] I. Sunscreen Lotion A

[0064] Prepare a sunscreen liquid A, the formulation of which includes the following raw materials in weight percentages:

[0065] The composition is as follows: 25% polydimethylsiloxane, 8% butyl octyl salicylate, 5% isododecane, 5% octyl polymethylsiloxane, 18% zinc oxide, 1% polymethyl silsesquioxane, 2% trimethylsilkoxysilicate, 2% acrylic (ester) copolymer, 1% polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.5% lauryl polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.5% polyglycerol-4 diisostearate / polyhydroxystearate / sebacic acid ester, 28% water, 3% glycerol, 0.5% p-hydroxyacetophenone, and 0.5% polyvinylpyrrolidone.

[0066] The preparation method of this sunscreen is as follows:

[0067] 1) Weigh out each of the above raw materials according to the corresponding weight percentage and set aside.

[0068] 2) The sunscreen (zinc oxide), emollient (polydimethylsiloxane, butyl octyl salicylate, isododecane, octyl polymethylsiloxane), emulsifier (polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, polyglycerol-4 diisostearate / polyhydroxystearate / sebate) are stirred and dispersed evenly at room temperature. Then, the skin feel modifier (polymethylsilsesquioxane) and the oily film-forming agent (trimethylsiloxysilicate and acrylic (ester) copolymer) are added and stirred and dispersed evenly to obtain the first phase, which is set aside for later use.

[0069] 3) Heat the humectant portion (water, glycerin, p-hydroxyacetophenone) to 80-90℃ and dissolve it evenly. Add polyvinylpyrrolidone (aqueous film-forming agent), stir and disperse evenly, and then cool to room temperature to obtain the second phase for later use.

[0070] 4) Add the second phase to the first phase, turn on the homogenizer, homogenize at 3000-6000 rpm, and emulsify and homogenize for 5-15 minutes to obtain the final product sunscreen liquid, which is called sunscreen liquid A.

[0071] II. Comparison of the effects of using oil-based film-forming agents and water-based film-forming agents in combination.

[0072] 1. Preparation of sunscreen liquid AD

[0073] Prepare sunscreen liquid AD according to the formulas listed in Table 1 below and the methods described above.

[0074] Table 1. Sunscreen Liquid AD Formula (Unit: wt%)

[0075]

[0076] 2. SPF value test

[0077] The SPF value of the sunscreen liquid AD prepared above was tested using the following method:

[0078] 1) Apply each of the above samples evenly onto a PMMA (polymethyl methacrylate) plate, with a coating amount of 1.3 mg / cm². 2 .

[0079] 2) Equilibrate the PMMA plate with the smeared sample in the dark for at least 15 minutes.

[0080] 3) The SPF value of the PMMA plate with the smeared sample was measured using a Labsphere SPF analyzer (UV2000S).

[0081] Four parallel samples were prepared for each sample, and the average value of the measurement results was taken. Blank measurements were also performed on the glycerol-treated PMMA plates, and the test results were read directly from the Labsphere SPF analyzer.

[0082] The test results are shown in Table 2 below:

[0083] Table 2. SPF values ​​of sunscreen lotion AD

[0084] Sunscreen A Sunscreen Liquid B Sunscreen C Sunscreen Lotion D SPF value 69.08 32.74 27.87 29.52

[0085] The above results indicate that, compared to sunscreen C without added film-forming agents, sunscreen B with added oil-based film-forming agents or sunscreen D with added water-based film-forming agents can both improve the SPF value of the sunscreen to a certain extent. Sunscreen A with both oil-based and water-based film-forming agents can significantly improve the SPF value of the sunscreen.

[0086] III. Screening the amount of sunscreen added

[0087] Based on sunscreen formula A, the effects of different amounts of sunscreen agents added on sun protection performance were compared.

[0088] 1. Preparation of sunscreen liquid EH

[0089] Prepare sunscreen liquid EH according to the formulas listed in Table 3 below and refer to the methods described above.

[0090] Table 3. Sunscreen Lotion A and EH Formulas (Unit: wt%)

[0091]

[0092]

[0093] 2. SPF value test

[0094] The SPF value of the prepared sunscreen liquid EH was tested according to the above method, and the test results are shown in Table 4 below:

[0095] Table 4. SPF values ​​of sunscreens A and EH

[0096] Sunscreen E Sunscreen A Sunscreen Liquid F Sunscreen G Sunscreen Liquid H SPF value 46.97 69.08 68.38 70.5 72.63

[0097] The above results indicate that as the content of zinc oxide, a sunscreen agent, increases, the SPF value of the sunscreen product also increases. However, the higher the content of sunscreen agent, the higher the cost, the more obvious the whitening effect, and the worse the user experience. Therefore, sunscreen A with an added amount of 18 parts of sunscreen agent is the optimal addition amount for overall effect.

[0098] IV. Screening Film-Forming Agent Types

[0099] This embodiment uses sunscreen formulas C and D as a basis to compare the effects of adding different film-forming agents on sunscreen performance.

[0100] 1. Preparation of sunscreen liquid HL

[0101] Sunscreen liquid HL was prepared according to the formulations listed in Table 5 below and the preparation method described above.

[0102] Table 5. Formulations of CD and HL sunscreen liquids (unit: wt%)

[0103]

[0104] 2. SPF value test

[0105] The SPF value of the sunscreen liquid HL prepared above was tested according to the above method, and the test results are shown in Table 6 below:

[0106] Table 6. SPF values ​​of sunscreens CD and HL

[0107]

[0108] The above results indicate that adding a single film-forming agent does not significantly improve the SPF value. Although the SPF values ​​of sunscreens H, I, J, and L are improved to some extent, the stability of sunscreens I and J is affected in the later stability observation, manifested as rough texture and unstable emulsion system.

[0109] V. Screening the Dosage of Water-Based Film-Forming Agents

[0110] Based on the sunscreen formula D, the effects of different amounts of water-based film-forming agents on sunscreen performance were compared.

[0111] 1. Preparation of sunscreen liquid MR

[0112] Prepare sunscreen liquid MR according to the formulas listed in Table 7 below and the preparation methods described above.

[0113] Table 7. Formulations of Sunscreen Lotions D and MR (Unit: wt%)

[0114]

[0115] 2. SPF value test

[0116] The SPF value of the sunscreen liquid MR prepared above was tested according to the above method, and the test results are shown in Table 8 below:

[0117] Table 8. SPF values ​​of sunscreens D and MR

[0118]

[0119] The above results indicate that as the content of the aqueous film-forming agent increases, the SPF value of the sunscreen product generally increases as well, but the improvement effect has reached the required level. Based on a comprehensive performance evaluation of product stability, sensory experience, and formulation compatibility, this embodiment selects 0.5% as the optimized addition amount of polyvinylpyrrolidone.

[0120] VI. Screening the Dosage of Trimethylsiloxysilicate

[0121] The effects of different amounts of the oil-based film-forming agent trimethylsiloxysilicate added on sun protection performance were compared.

[0122] 1. Preparation of sunscreen liquid SY

[0123] Prepare sunscreen liquid SY according to the formulas listed in Table 9 below and the preparation methods described above.

[0124] Table 9. SY Sunscreen Liquid Formula (Unit: wt%)

[0125]

[0126]

[0127] 2. SPF value test

[0128] The SPF value of the sunscreen liquid SY prepared above was tested using the method described above, and the test results are shown in Table 10 below:

[0129] Table 10. SPF values ​​of sunscreen liquid QW

[0130]

[0131] The above results indicate that as the content of the oily film-forming agent trimethylsiloxysilicate increases, the SPF value of the sunscreen product also increases. However, the higher the content of the oily film-forming agent, the oilier and heavier the skin feel. Based on a comprehensive performance evaluation of product stability, sensory experience, formulation compatibility, and technical effects, this embodiment selects 2% as the optimized addition amount.

[0132] VII. Screening the amount of acrylic (ester) copolymer added

[0133] The effects of different amounts of oil-based film-forming agents, such as acrylate copolymers, on sun protection performance were compared.

[0134] Prepare sunscreen liquids AA-AG according to the formulas listed in Table 11 below and the preparation methods described above.

[0135] Table 11. AA-AG Sunscreen Formula (Unit: wt%)

[0136]

[0137]

[0138] The SPF value of the prepared sunscreen liquid AA-AG was tested according to the above method, and the test results are shown in Table 12 below:

[0139] Table 12. SPF values ​​of AA-AG sunscreen

[0140]

[0141] The above results indicate that as the content of the oily film-forming agent, acrylate copolymer, increases, the SPF value of the sunscreen product also increases. The synergistic mechanism lies in preventing the generation of ROS free radicals and improving the efficiency of the sunscreen agent. However, the higher the content of the oily film-forming agent, the oilier and heavier the skin feel. Based on the comprehensive performance evaluation of product stability, sensory experience, formulation compatibility, and technical effect, this embodiment selects 2.0% as the optimized addition amount.

[0142] In summary, the above results indicate that using oil-based or water-based film-forming agents alone is less effective at improving sun protection performance than using them in combination. Different oil-based film-forming agents result in varying degrees of improvement in sun protection performance and may exhibit poor compatibility with the formulation system, leading to a rough texture and unstable emulsion system. Experiments show that using trimethylsiloxysilicate and acrylic (ester) copolymers together as oil-based film-forming agents can significantly improve the SPF value of sunscreen products.

[0143] Example 2

[0144] This embodiment conducts sensory tests on sunscreens A and B, and the experimental methods are as follows:

[0145] Test products: Sunscreen A; Sunscreen B.

[0146] Experimental Methods: Ten participants were included in the experiment. Sensory questionnaires were developed according to GB / T 12310-2012 Sensory Analysis Methods Paired Comparison Test (ISO 5495:2005, MOD) and GB / T 12311-2012 Sensory Analysis Methods Three-Point Test (ISO 4120:2004, MOD). Different sensory indicators were tested and scored. The test data for each sensory indicator were statistically analyzed to obtain quantitative descriptive sensory analysis results for sunscreen A and sunscreen B. The mean and standard deviation were calculated, and the results are shown in the table below.

[0147] Table 13. Average values ​​and statistical analysis results of sunscreen A and sunscreen B

[0148]

[0149]

[0150] Quantitative descriptive analysis of sensory test results showed that there were no statistically significant differences between test products A and B in terms of overall preference before use, during use, after use, and 2 minutes after use.

[0151] The above experimental results show that the combination of oil-based and water-based film-forming agents can significantly improve the sun protection effect (the SPF value of sunscreen A is 69.08, and that of sunscreen B is 32.74), and the skin feel is not significantly affected.

[0152] Example 3

[0153] This embodiment tests the sun protection duration of sunscreen liquid A. The experimental method is as follows:

[0154] The SPF value of the product was evaluated through human efficacy trials. Subjects were placed in a prone position, and their backs were irradiated. The minimum erythema dose (MED) of the subject's skin to ultraviolet radiation was predicted 24 hours prior to the trial, and the ultraviolet radiation dose was adjusted based on the prediction results for use in the test sample.

[0155] On the day of the experiment, a spot no less than 30cm long was first placed on the subject's back. 2 In normal skin areas, at (2.00±0.05) mg / cm² 2 Apply sunscreen A or the standard control (SPF = 16.1) evenly to the above-mentioned area and wait 15 minutes or as per the label instructions. Then, select an appropriate UV irradiation dose and irradiate the subject's skin under three conditions: ① no sample applied; ② standard control sample applied; ③ test sample (sunscreen A) applied. Observe the experimental results after 16-24 hours and record the MED values ​​under each of the three conditions.

[0156] Testing instruments: Solar Light 601 UV-Sunlight Simulator, Colormeter CL400, Benchtop Magnifier, GILSON M250 Pipette (50-250μL), Electronic Analytical Balance, Wood's Lamp.

[0157] Sun Protection Factor (SPF): The SPF of a sunscreen is the ratio of the Medium Effort Damage (MED) required to cause erythema on skin protected by sunscreen to the MED required to cause erythema on unprotected skin. It can be expressed as: SPF = MED of skin protected by sunscreen / MED of unprotected skin. This experiment involved a small sample size for SPF value determination, with only 3 valid cases. The results are for reference only. The experimental results are shown in Table 14.

[0158] Table 14. SPF results for sunscreen A on human skin

[0159]

[0160] The test results showed that, through testing the sun protection factor (SPF) of sunscreen cosmetics on three Asian adult subjects aged 21-35, the SPF value of the tested sample, sunscreen liquid A, was 51.3.

[0161] According to the SPF formula, if prolonged exposure to sunlight of a certain intensity will cause sunburn, then a proper and sufficient application of SPF (2 mg / cm²) is recommended. 2 Applying SPF 50 sunscreen can extend the sun protection time by up to 50 times (actual effectiveness may vary due to environmental and individual factors).

Claims

1. A synergistic film-forming agent composition, characterized in that, The film-forming agent comprises an oil-based film-forming agent and an aqueous film-forming agent; the mass ratio of the oil-based film-forming agent to the aqueous film-forming agent is 0.5-6:0.01-1.

2. The film-forming agent composition according to claim 1, characterized in that, Meets one or more of the following conditions: (1) The mass ratio of the oily film-forming agent to the watery film-forming agent is 0.5-4:0.1-0.7, preferably, the mass ratio of the oily film-forming agent to the watery film-forming agent is 4:0.5; (2) The oily film-forming agent is selected from one or more of the following: trimethylsiloxysilicate, acrylic (ester) copolymer, VP / eicosene copolymer, triacontyl PVP and polyC10-30 alkanol acrylate, preferably trimethylsiloxysilicate and acrylic (ester) copolymer, more preferably trimethylsiloxysilicate and acrylic (ester) copolymer with a mass ratio of 0.5-3.5:0.5-3.5, for example trimethylsiloxysilicate and acrylic (ester) copolymer with a mass ratio of 2:2; (3) The aqueous film-forming agent is selected from one or more of polyvinylpyrrolidone, VP / VA copolymer and VP / acrylate / lauryl methacrylate copolymer, preferably polyvinylpyrrolidone; (4) The film-forming synergist composition is trimethylsiloxysilicate, acrylic (ester) copolymer and polyvinylpyrrolidone in a mass ratio of 0.5-3.5:0.5-3.5:0.1-0.7, preferably in a mass ratio of 1-2:1-2:0.3-0.7, and more preferably in a mass ratio of 2:2:0.

5.

3. Use of the synergistic film-forming agent composition according to claim 1 or 2 in improving the sun protection performance of skin sunscreen formulations, preferably, the sun protection performance is an SPF value.

4. A sunscreen composition, characterized in that, It contains the following raw materials in parts by weight: 16-25 parts of sunscreen, 4-8 parts of the synergistic film-forming agent composition as described in claim 1 or 2, 2-5 parts of emulsifier, and 55.5-83 parts of skin conditioning agent.

5. The sunscreen composition according to claim 4, characterized in that, The skin conditioning agent is selected from: moisturizers, emollients, and skin feel modifiers; The sunscreen agent is 16-23 parts, the film-forming synergist composition is 4-6 parts, the emulsifier is 2-4 parts, the moisturizer is 25-35 parts, the emollient is 35-48 parts, and the skin feel modifier is 0.1-5 parts. Preferably, the sunscreen is 16.5-22 parts, the film-forming synergist composition is 4-5 parts, the emulsifier is 2-3 parts, the moisturizer is 28-33 parts, the emollient is 40-45 parts, and the skin feel modifier is 0.5-2 parts. More preferably, the sunscreen agent is 18 parts, the film-forming synergist composition is 4.5 parts, the emulsifier is 2 parts, the moisturizer is 31.5 parts, the emollient is 43 parts, and the skin feel modifier is 1 part.

6. The sunscreen composition according to claim 4, characterized in that, The sunscreen composition meets one or more of the following conditions: (1) The sunscreen agent is selected from one or more of zinc oxide, titanium dioxide, ethylhexyl salicylate and isoamyl p-methoxycinnamate, preferably zinc oxide, more preferably, the zinc oxide is 16.5-22 parts by weight, for example 17-19 parts, and most preferably 18 parts. (2) The emulsifier is selected from one or more of the following: polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, polyglycerol-4 diisostearate / polyhydroxystearate / sebacate and polyglycerol-2 dihydroxystearate; Preferably, the emulsifier is a mixture of polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, and polyglycerol-4 diisostearate / polyhydroxystearate / sebacate; More preferably, the emulsifier is a mixture of polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, and polyglycerol-4 diisostearate / polyhydroxystearate / sepiacetate in a mass ratio of 0.5-2.5:0.1-1.5:0.1-1.5, for example, a mixture of polyglycerol-3 polydimethylsiloxane, lauryl polyglycerol-3 polydimethylsiloxane, and polyglycerol-4 diisostearate / polyhydroxystearate / sepiacetate in a mass ratio of 1:0.5:0.5; (3) The moisturizer is selected from one or more of water, glycerin, butylene glycol, p-hydroxyacetophenone, 1,2-pentanediol and 1,3-propanediol; preferably, the moisturizer is a mixture of water, glycerin and p-hydroxyacetophenone; more preferably, the moisturizer is a mixture of water, glycerin and p-hydroxyacetophenone in a mass ratio of 20-40:1-10:0.1-1.0, for example, a mixture of water, glycerin and p-hydroxyacetophenone in a mass ratio of 28:3:0.5; (4) The emollient is selected from one or more of the following: polydimethylsiloxane, butyl octyl salicylate, isododecane, octyl polymethylsiloxane and caprylic / capric triglyceride; preferably, the emollient is a mixture of polydimethylsiloxane, butyl octyl salicylate, isododecane and octyl polymethylsiloxane; more preferably, the emollient is a mixture of polydimethylsiloxane, butyl octyl salicylate, isododecane and octyl polymethylsiloxane in a mass ratio of 1-40:1-20:1-10:1-10, for example, a mixture of polydimethylsiloxane, butyl octyl salicylate, isododecane and octyl polymethylsiloxane in a mass ratio of 25:8:5:5; (5) The skin feel modifier is selected from polymethylsilsesquioxane; preferably, the polymethylsilsesquioxane is 0.5-1.5 parts by weight, for example, 1 part.

7. The sunscreen composition according to claim 4, characterized in that, The raw materials contain the following parts by weight: 10-30 parts of polydimethylsiloxane, 1-10 parts of butyl octyl salicylate, 1-10 parts of isododecane, 1-10 parts of octyl polymethylsiloxane, 16.5-22 parts of zinc oxide, 1-8 parts of polymethylsilsesquioxane, 0.5-3.5 parts of trimethylsiloxysilicate, 0.5-3.5 parts of acrylic (ester) copolymer, 0.2-3 parts of polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.1-1 part of lauryl polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.1-1 part of polyglycerol-4 diisostearate / polyhydroxystearate / sebacate, 10-40 parts of water, 1-10 parts of glycerol, 0.1-2 parts of p-hydroxyacetophenone, and 0.1-2 parts of polyvinylpyrrolidone; Preferably, the sunscreen composition comprises the following raw materials in parts by weight: 25 parts polydimethylsiloxane, 8 parts butyl octyl salicylate, 5 parts isododecane, 5 parts octyl polymethylsiloxane, 18 parts zinc oxide, 1 part polymethylsilsesquioxane, 2 parts trimethylsilkoxysilicate, 2 parts acrylic (ester) copolymer, 1 part polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.5 parts lauryl polyglycerol-3 polydimethylsiloxyethyl polydimethylsiloxane, 0.5 parts polyglycerol-4 diisostearate / polyhydroxystearate / sebate, 28 parts water, 3 parts glycerin, 0.5 parts p-hydroxyacetophenone, and 0.5 parts polyvinylpyrrolidone.

8. A method for preparing the sunscreen composition according to any one of claims 4-7, characterized in that, The process includes the following steps: mixing sunscreen, oil-soluble raw materials, and emulsifier evenly, adding an oil-based film-forming agent, then adding water-soluble raw materials and an aqueous film-forming agent, mixing evenly to obtain the final product.

9. The method for preparing the sunscreen composition according to claim 8, characterized in that, Includes the following steps: Preparation of the first phase: Stir and disperse the sunscreen agent, liquid raw material from the oil-soluble raw material and emulsifier evenly, add the solid raw material from the oil-soluble raw material, mix evenly, then add the oily film-forming agent and disperse evenly to obtain the first phase, for later use; Preparation of the second phase: Dissolve the water-soluble raw material evenly, add the water-based film-forming agent, disperse evenly to obtain the second phase, and set aside for later use; Mixing: Add the second phase to the first phase and homogenize to obtain the final product.

10. The method for preparing the sunscreen composition according to claim 9, characterized in that, Meets at least one of the following conditions: (1) In the step of preparing the first phase, the sunscreen agent, the liquid raw material in the oil-soluble raw material, and the emulsifier are stirred and dispersed at room temperature; (2) In the step of preparing the second phase, the water-soluble raw material is dissolved uniformly at 80-90℃; further, the second phase is cooled to room temperature and then used for later use. (3) In the mixing step, the homogenization conditions are emulsification and homogenization at a homogenization speed of 3000-6000 rpm for 5-15 min.

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