Composition enabling O / W sunscreen product to have air feeling and application

Abstract

The invention relates to a composition enabling an O / W sunscreen product to have an air feeling and application. The composition is prepared from the following components in parts by weight: 0.1 to 5 parts of a compound water-phase thickening agent, 0.1 to 20 parts of a micromolecular humectant and 3 to 50 parts of light grease, wherein the compound water-phase thickening agent comprises a small-molecular low-viscosity thickening agent xanthan gum and a macromolecular high-viscosity thickening agent. The xanthan gum with specific viscosity is selected as a micromolecular low-viscosity thickening agent and is compounded with a macromolecular high-viscosity thickening agent, steric hindrance is formed by utilizing a rigid spiral structure of the xanthan gum, a synthesized polymer flexible network is prevented from being excessively wound, the problem that the network of the xanthan gum is easy to loosen at high temperature is solved, and the viscosity of the polymer is improved. And the short plate that a macromolecular high-viscosity thickening agent is too high in viscosity and easy to layer in a centrifugal manner when being independently used is avoided, and the sunscreen preparation which is stable and fresh and cool in use feeling is prepared. In addition, by adding light grease and a small molecule humectant, the decorous feeling of sunscreen is further reduced, and a fresh and soft skin feeling is provided for sunscreen.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology and relates to a composition that gives O / W sunscreen products an airy feel and its application. Background Technology

[0002] With societal development, people have gradually become aware of the harmful effects of ultraviolet (UV) radiation on the skin. UV radiation, as a major cause of photoaging, sunburn, and skin cancer, has become a global public health concern. Therefore, the importance of sunscreen has evolved from a cosmetic need to a basic health necessity. However, existing sunscreen products present a significant contradiction between protective efficacy and user experience, failing to meet consumers' dual demands for effective protection and a comfortable feel.

[0003] Currently, the preparation method for sunscreens with a refreshing and non-sticky feel uses PEG-12 polydimethylsiloxane / PPG-20 cross-linked copolymer as a thickener. A commercially available product is Dow Corning EL-7040 (containing 20% ​​of this copolymer and 80% octyl polymethylsiloxane), which is significantly more expensive than ordinary thickeners (see Chinese patent application number 201210551769.3, which discloses a transparent sunscreen cosmetic that refracts neon light). While the thickener polyquaternium-37 is labeled as electrolyte-resistant and water-resistant, it is essentially a cationic polymer, primarily used in hair care products to provide a smooth feel. However, it may cause skin irritation, leading to symptoms such as redness, swelling, pain, and itching. This may be due to the interaction between polyquaternium and skin cells, resulting in impaired skin barrier function and triggering inflammatory reactions (see Chinese patent application number 202010118276.5, which discloses a sunscreen cosmetic and its preparation method). Patent CN109453064A discloses a waterproof, sweat-resistant, and easily removable sunscreen cosmetic composition. It achieves waterproof and sweat-resistant properties at room temperature and easy washing in warm water by using water-soluble polymers (such as acrylic (ester) copolymers) with a glass transition temperature (Tg) of 0-45℃. However, this technical solution still has the following drawbacks: First, it focuses on film-forming properties and waterproof performance, without specifically optimizing for a lightweight and breathable feel. The amount of polymer used is relatively high (0.1-20.00%), and the selected emollient oils (such as mineral oil and silicone oil) are mostly conventional ingredients, which can easily lead to a sticky and heavy feel, lacking the "airy" feel consumers expect. Second, the solution does not synergistically design the thickener system, failing to solve stability issues such as network relaxation or centrifugal separation at high temperatures, affecting the long-term storage and performance of the product. Furthermore, the large amount of polymer used also leads to higher costs.

[0004] Therefore, there is an urgent need for a sunscreen product that is refreshing, non-sticky, low-cost, and non-irritating. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a composition and application that gives O / W sunscreen products an airy feel. This invention designs a preferred composition by selecting a compound aqueous thickener, a small-molecule moisturizer, and light oils in the O / W sunscreen formulation. By combining thickeners with different molecular weights and viscosities, the viscosity of the sunscreen product is improved. The addition of light oils reduces the heaviness of the sunscreen. Simultaneously, the composition contains small-molecule moisturizers, providing a refreshing and soft feel to the skin. This composition enhances the airy feel of O / W sunscreen products during application, making the product feel light, moisturizing, and breathable.

[0006] The objective of this invention can be achieved through the following methods:

[0007] In a first aspect, the present invention provides a composition for giving an airy feel to an O / W sunscreen product, comprising the following components in parts by weight: 0.1-5 parts of a compound aqueous thickener; Small molecule moisturizer, 0.1-20 parts; Light oils, 3-50 parts; The compound aqueous thickener includes a small molecule low-viscosity thickener and a large molecule high-viscosity thickener.

[0008] As one embodiment of the present invention, the small molecule low viscosity thickener includes xanthan gum; the large molecule high viscosity thickener includes one or more of the following: acrylate / C10-30 alkanol acrylate crosspolymer, ammonium acryloyl dimethyl taurate / VP copolymer, and VP / acrylate / lauryl methacrylate copolymer.

[0009] Furthermore, the xanthan gum is heated at 20°C. A 1% viscosity range is 800-1300 mPa·s, and a molecular weight of 2 million-3 million. Viscosities below this range result in uneven emulsified particle size in the sunscreen system, leading to poor product stability; viscosities above this range result in a thick, sticky sunscreen product, affecting the skin feel.

[0010] Furthermore, the acrylate / C10-30 alkanol acrylate crosspolymer is subjected to a temperature of 25°C. The viscosity of 0.2% is 6500-15000 mPa·s, and the acryloyldimethyl taurate / VP copolymer is at 20°C. The viscosity of 1% is 48000-65000 mPa·s, and the VP / acrylate / lauryl methacrylate copolymer has a viscosity of 20°C. The viscosity of 1% is 4000-5000 mPa·s.

[0011] In one embodiment of the present invention, the mass ratio of the small-molecule low-viscosity thickener to the large-molecule high-viscosity thickener in the compound aqueous thickener is 0.05-0.2:0.1-1; the viscosity of the compound aqueous thickener is 34000-38000 mPa·s. Viscosities below this range result in uneven emulsified particle size in the sunscreen system, leading to poor product stability; viscosities above this range result in a thick and sticky sunscreen product, affecting the skin feel. Preferably, the mass ratio of the small-molecule low-viscosity thickener to the large-molecule high-viscosity thickener is 0.1-0.4:0.8-1.1. More preferably, the mass ratio of the small-molecule low-viscosity thickener to the large-molecule high-viscosity thickener is 0.1-0.2:1-1.1.

[0012] Preferably, in the compound aqueous thickener, the mass ratio of xanthan gum, acrylate / C10-30 alkanol acrylate crosspolymer and ammonium acryloyl dimethyl taurate / VP copolymer is 0.1:0.5:0.5.

[0013] As one embodiment of the present invention, the small molecule moisturizer includes one or more of glycerin, 1,3-propanediol, 1,3-butanediol, sodium hyaluronate, panthenol, and sodium PCA.

[0014] Furthermore, the molecular weight of the sodium hyaluronate is 1000-5000 Da.

[0015] As one embodiment of the present invention, the light oil includes at least one of light synthetic oil and light vegetable oil; wherein, the light synthetic oil includes at least one of dioctyl carbonate and polydimethylsiloxane, and the light vegetable oil includes at least one of fermented camellia seed oil, enzymatically hydrolyzed camellia seed oil, and pre-emulsified camellia seed oil.

[0016] Preferably, the mass ratio of dioctyl carbonate, polydimethylsiloxane, fermented camellia seed oil, and enzymatically hydrolyzed camellia seed oil is 8:6.5:0.25:0.25.

[0017] Furthermore, the fermented red camellia seed oil is prepared according to the fermented red camellia seed oil in Example 2 of patent CN118813428A.

[0018] Furthermore, the average molecular weight of the enzymatically hydrolyzed camellia seed oil is less than 1000 Da.

[0019] Furthermore, the preparation method of the pre-emulsified red camellia seed oil is as follows: preheat the camellia seed oil, add hydrogenated lecithin and stir until completely dissolved, and homogenize at 1300-1600 rpm / min for 3-5 min to obtain the product; wherein, the mass ratio of camellia seed oil to hydrogenated lecithin is 10:0.3-10, and the preheating temperature is 70-80℃.

[0020] Secondly, the present invention provides a method for preparing a composition that gives an O / W sunscreen product an airy feel, comprising the following steps: S1. Mix the aqueous matrix, compounded aqueous thickener, and small molecule moisturizer as phase A, and heat and stir to dissolve; S2. Mix the oil phase matrix and light oil as phase B, and heat and stir to dissolve; S3. After mixing and homogenizing phases A and B, add phase C neutralizer after cooling and continue stirring to obtain the final product.

[0021] In one embodiment of the present invention, in step S1, the heating temperature is 88-95°C.

[0022] In one embodiment of the present invention, in step S2, the heating temperature is 80-86°C.

[0023] In one embodiment of the present invention, in step S3, the homogenization frequency is 35-50Hz and the time is 5-10min.

[0024] In one embodiment of the present invention, in step S3, the temperature is reduced to 45-55°C.

[0025] Thirdly, the present invention provides a sunscreen product, characterized in that it comprises 5-50% of the composition that gives the O / W sunscreen product an airy feel, 5-30% of a sunscreen agent, and the remainder being a sunscreen product matrix; the sunscreen product matrix comprises at least one of a solvent, a film-forming agent, an antioxidant, a preservative, a chelating agent, an emulsifying stabilizer, an emulsifier, a moisturizer, a skin-nourishing agent, and an oil solvent.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention selects xanthan gum of a specific viscosity as a low-viscosity, low-molecular-weight thickener, and combines it with a high-viscosity, high-molecular-weight thickener. The rigid helical structure of xanthan gum creates steric hindrance, preventing excessive entanglement of the synthetic polymer's flexible network. The high-viscosity, high-molecular-weight thickener's cross-linking points can reform after shearing, restoring system stability. The two work synergistically to construct a "rigid support-flexible cross-linking" composite structure. This avoids the high viscosity and heaviness caused by excessive cross-linking, while simultaneously improving the system's resistance to centrifugation and temperature changes, resulting in good stability. It solves the problem of xanthan gum's network loosening at high temperatures and avoids the shortcomings of synthetic polymers used alone, such as excessive viscosity and easy delamination during centrifugation. This allows for the production of stable, refreshing sunscreen formulations. The resulting composition improves the stickiness, heaviness, and lack of breathability of o / w sunscreens, giving them a light and breathable feel. Furthermore, this invention further enhances the stability of the composition and improves its airy feel by controlling the viscosity of the combined aqueous thickener.

[0027] 2. This invention selects a combination of high and low molecular weight thickeners. The high molecular weight thickener forms the main network, while the low molecular weight thickener fills the gaps in the network, reduces inter-chain entanglement, and lowers internal friction. This compounding optimizes the rheological properties of the high molecular weight thickener, thereby improving the thick and sticky feel of sunscreen products.

[0028] 3. This invention selects small-molecule lightweight moisturizers. Compared with large-molecule moisturizers, small-molecule moisturizers are absorbed quickly, have the advantages of a refreshing and non-sticky feel when applied, a light and thin feel on the skin, and no film-forming sensation, thus enhancing the skin's ability to breathe.

[0029] 4. This invention selects a combination of light oils - light synthetic oils + light vegetable oils, to avoid the heaviness of traditional oils and retain the functionality of vegetable oils. Attached Figure Description

[0030] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 The microstructure of the sunscreen product in Example 1; Figure 2 The microstructure of the sunscreen product in Example 2; Figure 3 The microstructure of the sunscreen product in Example 3; Figure 4 The microstructure of the sunscreen product in Comparative Example 1; Figure 5 The microstructure of the sunscreen product in Comparative Example 2; Figure 6 The microstructure of the sunscreen product in Comparative Example 3; Figure 7 The microstructure of the sunscreen product in Comparative Example 4 is shown. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following examples are implemented under the premise of the technical solution of the present invention, providing detailed implementation methods and specific operating procedures, which will help those skilled in the art to further understand the present invention. It should be noted that the scope of protection of the present invention is not limited to the following embodiments; any adjustments and improvements made under the concept of the present invention are all within the scope of protection of the present invention.

[0032] The raw materials used in this invention include: Xanthan Gum: Keltrol CG SFT, Azeles; Acrylic (ester) crosspolymers / C10-30 alkanol acrylate crosspolymers: CARBOPOL® Ultrez 20 Polymer, Lubrizol; Acryloyldimethyl taurate ammonium / VP copolymer: Aristoflex AVC, Clariant; VP / Acrylic (Ester) / Lauryl Methacrylate Copolymer: Antaron™ Sensory Polymer, Ashland; Sodium hyaluronate: molecular weight 2000 Da; Polydimethylsiloxane: XIAMETER™ PMX-200 Silicone Fluid 100 cSt, Dow; Fermented camellia seed oil: Preparation of fermented red camellia seed oil as described in Example 2 of patent CN118813428A.

[0033] Enzymatic hydrolysis of camellia seed oil: prepared according to the literature "Comparative Study on Physicochemical Properties and Efficacy of Camellia Seed Oil Before and After Enzymatic Hydrolysis", Chinese Wild Plant Resources, 2025, No. 4.

[0034] Pre-emulsified camellia seed oil: 10 parts of camellia seed oil were preheated to 75°C, 0.5 parts of hydrogenated lecithin were added and stirred until completely dissolved, and then homogenized at 1600 rpm / min for 5 min to obtain the product.

[0035] Example 1 An airy, open-ended (O / W) sunscreen composition comprising the following components in parts by weight: Three parts of a compound aqueous thickener; 8 parts of small molecule moisturizer; 30 parts of light oils; The compound aqueous thickener is: xanthan gum at a mass ratio of 1:11 (at 20℃). A mixture of 1% (viscosity 800 mPa·s) and acrylate / C10-30 alkanol acrylate crosslinked polymer, the viscosity of the mixture is 34000 mPa·s; The small molecule moisturizer is sodium hyaluronate. The light oil is a mixture of dioctyl carbonate, polydimethylsiloxane, fermented camellia seed oil, and enzymatically hydrolyzed camellia seed oil in a mass ratio of 8:6.5:0.25:0.25.

[0036] The airy O / W sunscreen composition from Example 1 is used to prepare a sunscreen product, comprising the following: The raw materials are shown in Table 1.

[0037] Table 1

[0038] The preparation method is as follows: 1) Add the aqueous matrix, compounded aqueous thickener, and small molecule moisturizer sequentially to a water pot as phase A, heat to 90°C, stir until dissolved and free of particles, and then transfer to an emulsification pot; wherein, the aqueous matrix includes solvent water, emulsifier, antioxidant, and chelating agent; 2) Add the oil phase matrix and light oil to the oil pan in sequence as phase B, heat to 85°C, stir and dissolve until there are no particles, and then pump into the emulsification pan; wherein, the oil phase matrix includes emulsifier, emulsion stabilizer and sunscreen.

[0039] 3) Keep the emulsifying pot temperature at 85℃, stir and mix A and B, then homogenize at a frequency of 40Hz for 7 minutes. 4) Cool the mixture to 50°C, add the C phase neutralizer (pH adjuster), stir thoroughly, and then cool to room temperature to obtain the final product.

[0040] Example 2 An airy, open-ended (O / W) sunscreen composition comprising the following components in parts by weight: Four parts of a compound aqueous thickener; 10 parts of small molecule moisturizer; 40 parts of light oils; The compound aqueous thickener is xanthan gum in a mass ratio of 2:6:5 (at 20℃). A mixture of 1% of an acrylic (ester) / C10-30 alkanol acrylate crosspolymer and an ammonium acryloyl dimethyl taurate / VP copolymer, with a viscosity of 36000 mPa·s. The small molecule moisturizer is sodium hyaluronate. The light oil is a mixture of dioctyl carbonate, polydimethylsiloxane, fermented camellia seed oil, enzymatically hydrolyzed camellia seed oil, and pre-emulsified camellia seed oil in a mass ratio of 7.0:5.0:0.25:0.25:0.5.

[0041] The airy O / W sunscreen composition differs from Example 1 in that: the weight parts of the compounded aqueous thickener xanthan gum, acrylate / C10-30 alkanol acrylate crosspolymer, and ammonium acryloyl dimethyl taurate / VP copolymer are 0.08, 0.24, and 0.2, respectively; the weight part of the small molecule moisturizer sodium hyaluronate is 1.3; and the weight parts of the light oils dioctyl carbonate, polydimethylsiloxane, fermented camellia seed oil, enzymatically hydrolyzed camellia seed oil, and pre-emulsified camellia seed oil are 2.8, 2.0, 0.1, 0.1, and 0.2, respectively. The other raw materials and preparation methods of the sunscreen product are the same as in Example 1.

[0042] Example 3 An airy, open-ended (O / W) sunscreen composition comprising the following components in parts by weight: Five parts of a compound aqueous thickener; 20 parts of small molecule moisturizer; 40 parts of light oils; The compound aqueous thickener is xanthan gum in a mass ratio of 2:7:3 (at 20℃). A mixture of 1% (viscosity 1300 mPa·s), ammonium acryloyl dimethyl taurate / VP copolymer, and VP / acrylate / lauryl methacrylate copolymer, with a viscosity of 38000 Pa·s; The small molecule moisturizer is glycerin. The light oil is a mixture of dioctyl carbonate, polydimethylsiloxane, and pre-emulsified camellia seed oil in a mass ratio of 10:5:1.

[0043] The airy O / W sunscreen composition differs from Example 1 in that: the weight parts of the aqueous thickener xanthan gum, ammonium acryloyl dimethyl taurate / VP copolymer, and VP / acrylate / lauryl methacrylate copolymer are 0.16, 0.56, and 0.24, respectively; the weight part of the small molecule moisturizer glycerin is 3.2; and the weight parts of the light oils dioctyl carbonate, polydimethylsiloxane, and pre-emulsified camellia seed oil are 4, 2, and 0.4, respectively. The other raw materials and preparation method of the sunscreen product are the same as in Example 1.

[0044] Comparative Example 1 The composition and preparation method of this comparative example are basically the same as those of Example 2, except that the viscosity of xanthan gum in the aqueous thickener is adjusted to 500 mPa·s (Jungbunzlauer).

[0045] Comparative Example 2 The composition and preparation method of this comparative example are basically the same as those of Example 2, except that the viscosity of xanthan gum in the aqueous thickener is adjusted to 1000 mPa·s (Ningxia Shangfang Biotechnology Co., Ltd.).

[0046] Comparative Example 3 The composition and preparation method of this comparative example are basically the same as those of Example 2, except that the xanthan gum in the aqueous thickener (at 20°C) is added. The viscosity of 1% is 1000 mPa·s, and the mass ratio of acrylic (ester) / C10-30 alkanol acrylate crosspolymer and ammonium acryloyl dimethyl taurate / VP copolymer is adjusted to 6:6:1, with a viscosity of 20000 mPa·s.

[0047] Comparative Example 4 The composition and preparation method of this comparative example are basically the same as those of Example 2, except that the xanthan gum in the aqueous thickener (at 20°C) is added. The viscosity of 1% is 1000 mPa·s, and the mass ratio of acrylic (ester) / C10-30 alkanol acrylate crosspolymer and ammonium acryloyl dimethyl taurate / VP copolymer is adjusted to 1:5:7, resulting in a viscosity of 60000 mPa·s.

[0048] Efficacy verification experiment: Test Example 1 Viscosity Table 2

[0049] The viscosity of the sunscreen products prepared by O / W in Examples 1-3 and Comparative Examples 1-4 was tested using a BROOKFIELD viscometer with RV (6) rotor at a speed of 6 rpm. The results are shown in Table 2.

[0050] Test Example 2: Centrifugal Stability and Storage Stability Table 3

[0051] The suspension force of each emulsion was observed by centrifugation. Specifically, centrifugal stability was determined by placing the sunscreen products prepared in Examples 1-3 and Comparative Examples 1-4 in a benchtop centrifuge, selecting a centrifugation speed of 3000 r / min, and centrifuging for 30 min. The system was then observed for stratification. If no stratification occurred, the system was considered stable; otherwise, it was considered unstable.

[0052] Storage tests were conducted using constant-temperature incubators at different temperatures. Test conditions included 48℃, 40℃, cyclic incubation, refrigeration (4℃), room temperature, light exposure, and freezing (-18℃), with a testing period of 3 months. The presence of stratification, flocculation, or demulsification was observed. If none of these phenomena occurred, the system was considered stable; otherwise, it was considered unstable.

[0053] The results are shown in Table 3. Compared with Examples 1-3, the centrifugation results of Comparative Examples 1 and 3 showed different degrees of oil floating, while no significant changes were found in Comparative Examples 2 and 4. Regarding temperature stability, Examples 1-3 all exhibited good temperature stability, while Comparative Examples 1-4 showed varying degrees of oil seepage, thinning of the material, and coarsening of the material. Comparative Example 1 used lower viscosity xanthan gum, and Comparative Example 3 reduced the viscosity of the acrylate / C10-30 alkanol acrylate cross-linked polymer. Therefore, while using low-viscosity xanthan gum and acrylate / C10-30 alkanol acrylate cross-linked polymer resulted in a lightweight sunscreen formulation, it was not stable. Comparative Example 2 used high-viscosity xanthan gum, and Comparative Example 4 increased the viscosity of the acrylate / C10-30 alkanol acrylate cross-linked polymer. Compared with the examples, the texture was thicker, and the material showed varying degrees of coarsening during the temperature change test, making it unsuitable for creating an airy sunscreen product.

[0054] Examples 1-3, using xanthan gum of suitable viscosity and acrylate / C10-30 alkanol acrylate crosslinking polymers, all yielded stable sunscreen formulations with different viscosities. This indicates that the combination of the two can achieve a compound system with a moderate viscosity range. The rigid helical structure of xanthan gum forms steric hindrance, preventing the flexible network of the synthetic polymer from becoming excessively entangled. The crosslinking points of the C10-30 alkanol acrylate crosslinking polymer can reform after shearing, restoring the stability of the system. The two work together to construct a "rigid support-flexible crosslinking" composite structure, avoiding the high viscosity and heaviness caused by excessive crosslinking, while improving the system's resistance to centrifugation and temperature changes, resulting in good stability. This solves the problem of xanthan gum's network easily relaxing at high temperatures and avoids the shortcomings of synthetic polymers being too viscous and prone to separation by centrifugation when used alone, resulting in a stable sunscreen formulation with a refreshing feel.

[0055] Test Example 3: Micromorphology Testing instrument: OLYMPUS BX43P polarizing microscope; Observation ratio: 400x The results are as follows: Figure 1-3As shown, the sunscreen products prepared in Examples 1-3 all have a microscopic particle size of 1.8-2.2 micrometers. The small and uniform average droplet size indicates a greater number of droplets per unit volume. When dispersed in the system, the scattering of light is gentler, avoiding the "heavy" feeling caused by large particle aggregation. Application is also lighter, forming an airy protective film. Simultaneously, the droplet size distribution is uniform, with no obviously oversized or undersized particles. This uniform particle size distribution makes the physical and chemical properties of each part of the system more consistent, reducing instability factors such as phase separation caused by large particle size differences, and contributing to the long-term stability of the system. Xanthan gum and polymers can more effectively form a steric hindrance layer around the droplets. These steric hindrance layers prevent the aggregation and fusion of droplets, avoiding the formation of large particles. This ensures the system is not "heavy" and enhances stability, making the system less prone to delamination and emulsification during storage and use, thus enhancing the durability of the airy protective film.

[0056] The results are as follows: Figure 4-7 As shown, the sunscreen products prepared in Comparative Examples 1-4 have relatively large average droplet sizes, with some significantly larger droplets. These large droplets may be incompletely emulsified oil droplets. Large droplets tend to aggregate strongly in the system and are also more prone to settling due to gravity and other factors. The droplet size distribution is uneven, with large and small particles mixed together. This inhomogeneity creates different phase regions within the system, with significant differences in the forces between these regions, easily leading to phase separation, disrupting the system's stability, and causing stratification and precipitation. Due to the large and unevenly distributed particle size, the polymer on the droplet surface cannot form an effective and uniform steric hindrance layer. The steric hindrance around some large particles is weak, making it easy for droplets to overcome the steric hindrance and aggregate, further increasing the particle size and greatly reducing stability, thus failing to provide a good protective film effect during use.

[0057] Test Example 4: Sensory Test Table 4

[0058] Rating criteria: 1-10 indicates the degree of agreement, such as 1 indicating strong disagreement and 10 indicating strong agreement.

[0059] Sixteen volunteers were selected, eight men and eight women, aged 24-35, with skin types including dry, oily, combination, and sensitive skin. They rated the sunscreen products based on smoothness, lightness, breathability, moisturizing, adherence, lasting power, and overall satisfaction. Higher scores indicated better performance for that indicator, and the final result was the average of the volunteers' scores.

[0060] The results are shown in Table 4, indicating that the sunscreen products of Examples 1-3 scored significantly better than those of Comparative Examples 1-4. This shows that the airy O / W sunscreen composition provided by the present invention is more in line with the needs of the subjects in terms of user experience, and has good lightweight breathability, moisturizing effect and application feel.

[0061] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A composition for giving O / W sunscreen products an airy feel, characterized in that, The components include the following parts by weight: 0.1-5 parts of a compound aqueous thickener; Small molecule moisturizer, 0.1-20 parts; Light oils, 3-50 parts; The compounded aqueous thickener includes a small-molecule low-viscosity thickener and a large-molecule high-viscosity thickener, wherein the small-molecule low-viscosity thickener includes xanthan gum; the xanthan gum is used at 20°C. The viscosity of 1% is 800-1300 mPa·s.

2. The composition according to claim 1, characterized in that, The xanthan gum has a molecular weight of 2 million to 3 million.

3. The composition according to claim 1, characterized in that, The macromolecular high-viscosity thickener includes one or more of the following: acrylate / C10-30 alkanol acrylate crosslinking polymer, ammonium acryloyl dimethyl taurate / VP copolymer, and VP / acrylate / lauryl methacrylate copolymer; wherein the acrylate / C10-30 alkanol acrylate crosslinking polymer is used at 25°C. The viscosity of 0.2% is 6500-15000 mPa·s, and the ammonium acryloyldimethyl taurate / VP copolymer is [not specified] at 20°C. The viscosity of 1% is 48000-65000 mPa·s, and the VP / acrylate / lauryl methacrylate copolymer has a viscosity of 20°C. The viscosity of 1% is 4000-5000 mPa·s.

4. The composition according to claim 1, characterized in that, In the compound aqueous thickener, the mass ratio of small molecule low viscosity thickener to large molecule high viscosity thickener is 0.05-0.2:0.1-1; the viscosity of the compound aqueous thickener is 34000-38000 mPa·s.

5. The composition according to claim 1, characterized in that, The small molecule moisturizer includes one or more of glycerin, 1,3-propanediol, 1,3-butanediol, sodium hyaluronate, panthenol, and sodium PCA; the molecular weight of the sodium hyaluronate is 1000-5000 Da.

6. The composition according to claim 1, characterized in that, The light oils include at least one of light synthetic oils and light vegetable oils; wherein the light synthetic oils include at least one of dioctyl carbonate and polydimethylsiloxane, and the light vegetable oils include at least one of fermented camellia seed oil, enzymatically hydrolyzed camellia seed oil, and pre-emulsified camellia seed oil.

7. The composition according to claim 6, characterized in that, The preparation method of the pre-emulsified red camellia seed oil is as follows: preheat the camellia seed oil, add hydrogenated lecithin and stir until completely dissolved, and homogenize at 1300-1600 rpm / min for 3-5 min to obtain the oil; wherein, the mass ratio of camellia seed oil to hydrogenated lecithin is 10:0.3-10, and the preheating temperature is 70-80℃.

8. A method for preparing a composition according to any one of claims 1-7 that gives an O / W sunscreen product an airy feel, characterized in that, Includes the following steps: S1. Mix the aqueous matrix, compounded aqueous thickener, and small molecule moisturizer as phase A, and heat and stir to dissolve; S2. Mix the oil phase matrix and light oil as phase B, and heat and stir to dissolve; S3. After mixing and homogenizing phases A and B, add phase C neutralizer after cooling and continue stirring to obtain the final product.

9. The preparation method according to claim 8, characterized in that, In step S1, the heating temperature is 88-95℃; And / or, in step S2, the heating temperature is 80-86°C; And / or, in step S3, the homogenization frequency is 35-50Hz and the time is 5-10min.

10. A sunscreen product, characterized in that, The product comprises 5-50% of the composition for giving O / W sunscreen products an airy feel as described in any one of claims 1-7, 5-30% of the sunscreen agent, and the remainder being the sunscreen product base; the sunscreen product base includes at least one of solvent, film-forming agent, antioxidant, preservative, chelating agent, emulsifying stabilizer, emulsifier, moisturizer, skin moisturizer, and oil solvent.

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