Air soft mist lip cosmetic having long-lasting moisturizing effect and preparation method thereof

Abstract

The application discloses an air soft mist lip cosmetic with long-acting moisturizing effect and a preparation method thereof, and relates to the technical field of lip cosmetics. The air soft mist lip cosmetic with long-acting moisturizing effect comprises the following components: water-dispersed silicone elastomer 75-85 wt%; and polyhydric alcohol 3-10 wt%. The application controls the content of the water-dispersed silicone elastomer within the range of 75-85 wt% and the content of the polyhydric alcohol within the range of 3-10 wt%, and utilizes the three-dimensional network structure formed by the water-dispersed silicone elastomer through an emulsification process to embed the polyhydric alcohol in the three-dimensional network structure, thereby constructing a long-acting moisturizing system of the'storage-release' type. The three-dimensional network structure forms a continuous and flexible film structure on the surface of the lips, effectively slows down the evaporation speed of water, and realizes the technical effect of significantly prolonging the moisturizing duration of the lip product while maintaining the air soft mist light and thin feeling.

Description

Technical Field

[0001] This invention relates to lip cosmetics technology, specifically to an air-soft matte lip cosmetic with long-lasting moisturizing effect and its preparation method. Background Technology

[0002] As consumers' demands for lip makeup products continue to rise, lip cosmetics that combine excellent makeup effects with comfortable application have become the mainstream market demand. In recent years, lip products based on water-dispersible silicone elastomers have received widespread attention for their ability to achieve a lightweight, soft-matte finish. These products typically rely on volatile carrier systems to achieve an airy, lightweight, and non-sticky user experience, quickly forming a soft-matte effect after application, satisfying consumers' pursuit of a matte texture.

[0003] However, existing lip products based on water-dispersed silicone elastomers have significant technical shortcomings in practical use. Studies have shown that these products tend to cause dryness within 5-10 minutes after application, primarily due to the lack of an effective, sustained moisturizing mechanism after water evaporation. Specifically, after application to the lips, the water and volatile components in the water-dispersed silicone elastomer system evaporate rapidly, leading to accelerated moisture loss from the lip surface. Simultaneously, traditional formulations often contain low levels of polyol moisturizers or have unstable distribution within the system, making it difficult to maintain a long-lasting moisturizing effect after water evaporation. Furthermore, while some existing technologies attempt to improve moisturization by adding oil-based ingredients, this often results in a thicker, stickier texture, sacrificing the inherent airy and lightweight advantage of water-dispersed silicone elastomer systems.

[0004] Therefore, achieving long-lasting moisturizing effects while maintaining the airy, lightweight, and non-sticky feel characteristic of water-dispersed silicone elastomer systems remains a key technical challenge in the field of lip cosmetics. This invention addresses the shortcomings of the prior art by providing a cosmetic composition and its preparation method that significantly prolongs lip moisturizing duration while maintaining an airy, soft-matte feel. Summary of the Invention

[0005] The purpose of this invention is to provide an air-soft mist lip cosmetic with long-lasting moisturizing effect and its preparation method, so as to solve the problem that water-dispersible silicone elastomer lip products in the prior art lack a continuous moisturizing mechanism after the water evaporates and are prone to dryness within 5 to 10 minutes after use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an air-soft matte lip cosmetic with long-lasting moisturizing effect, wherein the total weight of the lip cosmetic comprises the following components:

[0007] Water-dispersed silicone elastomer: 75–85 wt%;

[0008] Polyols: 3–10 wt%

[0009] The water-dispersible silicone elastomer comprises a polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, polydimethylsiloxane, and water, wherein the polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer is present in a content of 10-15 wt%, the polydimethylsiloxane is present in a content of 40-70 wt%, and the water is present in a content of 20-40 wt%.

[0010] The polyol is selected from one or more of glycerol, butanediol, and propylene glycol;

[0011] The water-dispersed silicone elastomer is a silicone elastomer dispersion system with a three-dimensional network structure formed by emulsifying polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, polydimethylsiloxane, water and emulsifier at a temperature of 20-40°C and a rotation speed of 1000-5000 rpm for 10-60 minutes. The polyol is at least partially embedded in the pores of the three-dimensional network structure, so that the polyol is continuously released under the constraint of the three-dimensional network structure.

[0012] Furthermore, the water-dispersible silicone elastomer also contains an emulsifier, the content of which in the water-dispersible silicone elastomer is 0.5 to 5 wt%.

[0013] Furthermore, the polyol is butanediol.

[0014] Furthermore, the content of the water-dispersible silicone elastomer is 78-82 wt%, and the content of the polyol is 4-6 wt%.

[0015] Further, the content of the polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer in the water-dispersed silicone elastomer is 12-14 wt%, the content of polydimethylsiloxane in the water-dispersed silicone elastomer is 50-60 wt%, and the content of water in the water-dispersed silicone elastomer is 25-35 wt%.

[0016] Furthermore, the content of the water-dispersible silicone elastomer is 80 wt%, the content of the polyol is 5 wt%, and the polyol is butanediol.

[0017] Furthermore, after the lip cosmetic is applied to the lips, it forms a continuous and flexible film structure. The polyol in the film structure is continuously and slowly released under the constraint of the three-dimensional network structure, so that the lip cosmetic maintains a moisturizing feel for 60 minutes after application.

[0018] A method for preparing an air-soft matte lip cosmetic with long-lasting moisturizing effects includes the following steps:

[0019] Step 1: Preparation of water-dispersed silicone elastomer: 10-15 wt parts of polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, 40-70 wt parts of polydimethylsiloxane, 20-40 wt parts of water and 0.5-5 wt parts of emulsifier are mixed and emulsified through an emulsification process to form a silicone elastomer dispersion system with a three-dimensional network structure, thus obtaining the water-dispersed silicone elastomer;

[0020] Step 2: Mix 75-85 wt parts of the water-dispersible silicone elastomer obtained in Step 1 with 3-10 wt parts of a polyol, wherein the polyol is selected from one or more of glycerin, butylene glycol and propylene glycol, and stir evenly to obtain the lip cosmetic.

[0021] Furthermore, in step one, the emulsification temperature is 20–40°C, the emulsification time is 10–60 minutes, and the emulsification speed is 1000–5000 rpm.

[0022] Furthermore, in step two, the stirring temperature is 20–40°C, the stirring time is 5–30 minutes, and the stirring speed is 200–1000 rpm.

[0023] Compared with the prior art, the air-soft matte lip cosmetic and its preparation method provided by the present invention have the following beneficial effects:

[0024] By controlling the content of water-dispersible silicone elastomer within a specific ratio range of 75–85 wt% and the content of polyol within a range of 3–10 wt%, a "storage-slow-release" long-lasting moisturizing system is constructed by utilizing the three-dimensional network structure formed by the emulsification process of the water-dispersible silicone elastomer, allowing the polyol to be at least partially embedded in this three-dimensional network structure. In this system, the three-dimensional network structure forms a continuous and flexible film structure on the lip surface, effectively slowing down the rate of moisture evaporation; on the other hand, it stably embeds the polyol within the network, allowing it to be released continuously and evenly under the constraint of the network. This achieves the technical effect of significantly extending the duration of lip moisturizing while maintaining the light and airy feel of the lip product.

[0025] Simultaneously, while achieving long-lasting moisturizing, the product of this invention, through the synergistic effect of water-dispersed silicone elastomer and polyol within a specific ratio range, does not compromise the original airy, lightweight texture and soft-matte finish of the water-dispersed silicone elastomer system. By increasing the polyol content to 3-10 wt%, no stickiness, heaviness, or decreased adhesion due to the increased moisturizing ingredients occurred. Instead, the polyol's embedding in the three-dimensional network forms a stable, sustained-release system, allowing the product to maintain its airy, lightweight feel and soft-matte finish for 60 minutes, achieving a synergistic improvement in both moisturizing performance and user experience. Furthermore, the choice of polyol is flexible, with glycerin, butylene glycol, and propylene glycol all suitable, demonstrating good formulation adaptability and promising prospects for industrial application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a flowchart illustrating the preparation method of an air-soft mist lip cosmetic with long-lasting moisturizing effect according to the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] In each embodiment, the water-dispersed silicone elastomer is prepared by the following method: a polydimethylsiloxane / vinyl polydimethylsiloxane crosslinking polymer, polydimethylsiloxane, water, and an emulsifier are mixed in proportion, and emulsified at 20–40°C and 1000–5000 rpm for 10–60 minutes to obtain a silicone elastomer dispersion system with a three-dimensional network structure. The emulsifier is selected from one or more of polyglycerol-3 polyricinoleate, PEG-10 polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane, polysorbate-20, polysorbate-80, and cetyl PEG / PPG-10 / 1 polydimethylsiloxane. Preferably, the emulsifier is PEG-10 polydimethylsiloxane.

[0030] Example 1

[0031] Please see Figure 1 As shown, this embodiment provides an air-soft mist lip cosmetic with long-lasting moisturizing effect and its preparation method.

[0032] The lip cosmetic product of this embodiment, based on the total weight of the lip cosmetic product, comprises the following components:

[0033] Water-dispersed silicone elastomer: 80wt%

[0034] Butylene glycol: 5 wt%

[0035] The remainder consists of excipients acceptable in the cosmetics industry (such as preservatives, fragrances, etc.).

[0036] The water-dispersed silicone elastomer comprises, by weight, 12 wt% polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, 55 wt% polydimethylsiloxane, 30 wt% water, and 3 wt% emulsifier.

[0037] The preparation method of this embodiment includes the following steps:

[0038] Step 1: Preparation of water-dispersed silicone elastomer: 12 wt parts of polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, 55 wt parts of polydimethylsiloxane, 30 wt parts of water and 3 wt parts of emulsifier are mixed and emulsified at 25°C and 3000 rpm for 30 minutes to form a silicone elastomer dispersion system with a three-dimensional network structure, which is the water-dispersed silicone elastomer.

[0039] Step 2, Preparation of the composition: Mix 80 wt parts of the water-dispersible silicone elastomer obtained in Step 1 with 5 wt parts of butylene glycol, and stir at 500 rpm for 15 minutes at 25°C until homogeneous to obtain the lip cosmetic.

[0040] The product obtained in this embodiment has a soft, airy matte texture when applied to the lips, and is lightweight and non-sticky. Testing showed that the lips remained noticeably moisturized for up to 60 minutes after application, significantly reducing the drying speed compared to traditional water-dispersed silicone elastomer products.

[0041] Characterization methods:

[0042] (1) Characterization of the three-dimensional network structure: The microstructure of the water-dispersed silicon elastomer was observed using scanning electron microscopy (SEM). After freeze-drying the sample, it was sputter-coated with gold and observed under an accelerating voltage of 5 kV. A distinct three-dimensional porous network structure was visible, with pore sizes ranging from 0.5 to 5 μm.

[0043] (2) Verification of the polyol intercalation state: Differential scanning calorimetry (DSC) was used to perform thermal analysis on the water-dispersed silicone elastomer system containing polyols. The temperature was increased from -80℃ to 50℃ at a rate of 10℃ / min. Pure polyols showed melting peaks at specific temperatures, while the melting peaks of polyols intercalated into the three-dimensional network disappeared or were significantly weakened, indicating that the molecular motion of polyols was restricted by the network structure.

[0044] (3) Verification of the sustained-release behavior of polyols: The release kinetics of polyols were determined using the Franz diffusion cell method. Samples were uniformly coated onto an artificial membrane, and phosphate-buffered saline (PBS, pH 7.4) was used as the receiving medium. Samples were taken at different time points at 37°C, and the cumulative release of polyols in the receiving solution was determined by high-performance liquid chromatography (HPLC). The results showed that the cumulative release rate of polyols in the product of this invention did not exceed 40% within 60 minutes, exhibiting a sustained-release characteristic.

[0045] (4) Characterization of membrane structure: The product obtained in Example 1 was uniformly coated onto a glass plate at a coating amount of 2 mg / cm² and dried under constant temperature and humidity conditions (25℃, RH 50%) to form a film. The surface and cross-sectional morphology of the membrane were observed using a scanning electron microscope, and the membrane structure was found to be continuous and free of cracks or pores. The mechanical properties of the membrane were measured using a micro tensile tester, and the results showed that the elongation at break of the membrane was ≥50%, indicating that the membrane has flexibility.

[0046] Example 2

[0047] Please see Figure 1 As shown, this embodiment provides an air-soft mist lip cosmetic with long-lasting moisturizing effect and its preparation method.

[0048] The lip cosmetic product of this embodiment, based on the total weight of the lip cosmetic product, comprises the following components:

[0049] Water-dispersed silicone elastomer: 75wt%

[0050] Glycerin: 8wt%

[0051] The remainder is an excipient acceptable for use in the cosmetics industry.

[0052] The water-dispersed silicone elastomer comprises, by weight, 10 wt% polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, 60 wt% polydimethylsiloxane, 28 wt% water, and 2 wt% emulsifier.

[0053] The preparation method of this embodiment includes the following steps:

[0054] Step 1: Preparation of water-dispersed silicone elastomer: 10 wt parts of polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, 60 wt parts of polydimethylsiloxane, 28 wt parts of water and 2 wt parts of emulsifier are mixed and emulsified at 30°C and 2000 rpm for 45 minutes to form a silicone elastomer dispersion system with a three-dimensional network structure, which is the water-dispersed silicone elastomer.

[0055] Step 2, Preparation of the composition: Mix 75 wt parts of the water-dispersible silicone elastomer obtained in Step 1 with 8 wt parts of glycerin, and stir at 400 rpm for 20 minutes at 30°C until homogeneous to obtain the lip cosmetic.

[0056] The product obtained in this embodiment provides a good soft matte finish when applied to the lips, while also offering significant moisturizing effects. Testing showed that the lips remained well-hydrated for up to 60 minutes after application, and the texture was light and non-sticky.

[0057] Example 3

[0058] Please see Figure 1 As shown, this embodiment provides an air-soft mist lip cosmetic with long-lasting moisturizing effect and its preparation method.

[0059] The lip cosmetic product of this embodiment, based on the total weight of the lip cosmetic product, comprises the following components:

[0060] Water-dispersed silicone elastomer: 85 wt%

[0061] Propylene glycol: 3wt%

[0062] The remainder is an excipient acceptable for use in the cosmetics industry.

[0063] The water-dispersed silicone elastomer comprises, by weight, 15 wt% polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, 45 wt% polydimethylsiloxane, 35 wt% water, and 5 wt% emulsifier.

[0064] The preparation method of this embodiment includes the following steps:

[0065] Step 1: Preparation of water-dispersed silicone elastomer: 15 wt parts of polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, 45 wt parts of polydimethylsiloxane, 35 wt parts of water and 5 wt parts of emulsifier are mixed and emulsified at 35°C and 4000 rpm for 20 minutes to form a silicone elastomer dispersion system with a three-dimensional network structure, which is the water-dispersed silicone elastomer.

[0066] Step 2, Preparation of the composition: Mix 85 wt parts of the water-dispersible silicone elastomer obtained in Step 1 with 3 wt parts of propylene glycol, and stir at 600 rpm for 10 minutes at 35°C until homogeneous to obtain the lip cosmetic.

[0067] The product obtained in this embodiment has an excellent airy, lightweight texture and a soft matte finish. Testing showed that although the polyol content is relatively low (3wt%), the high content of water-dispersible silicone elastomer (85wt%) and the denser three-dimensional network structure result in a more prolonged sustained-release effect of the polyol, achieving a continuous moisturizing effect for over 60 minutes.

[0068] Comparison Example

[0069] To more clearly illustrate the improvements of this invention over the prior art, a representative prior art solution is provided below as a comparative example.

[0070] This comparative example provides a typical air-soft matte lip cosmetic based on a water-dispersible silicone elastomer in the prior art.

[0071] The lip cosmetic product of this comparative example, based on the total weight of the lip cosmetic product, contains the following components:

[0072] Water-dispersed silicone elastomer: 85 wt%

[0073] Butylene glycol: 1.5 wt%

[0074] The remainder is for excipients (including colorants, preservatives, fragrances, etc.) that are acceptable in the cosmetics industry.

[0075] The water-dispersed silicone elastomer comprises, by weight, 12 wt% polydimethylsiloxane / vinyl polydimethylsiloxane crosspolymer, 55 wt% polydimethylsiloxane, 30 wt% water, and 3 wt% emulsifier.

[0076] The preparation method of this comparative example includes the following steps:

[0077] Step 1: Preparation of water-dispersed silicone elastomer: 12 wt parts of polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, 55 wt parts of polydimethylsiloxane, 30 wt parts of water and 3 wt parts of emulsifier are mixed and emulsified at 25°C and 3000 rpm for 30 minutes to form a water-dispersed silicone elastomer system.

[0078] Step 2, Preparation of the composition: Mix 85 wt parts of the water-dispersible silicone elastomer obtained in Step 1 with 1.5 wt parts of butylene glycol, and stir at 500 rpm for 15 minutes at 25°C until homogeneous to obtain the lip cosmetic.

[0079] This comparative example represents a common formulation approach for lip products based on water-dispersed silicone elastomers in the prior art. This type of formulation primarily relies on the water-dispersed silicone elastomer system to achieve a lightweight, airy feel and a soft-matte finish upon application, while adding a small amount of polyol (typically 1–3 wt%) to provide basic moisturizing effects. The water-dispersed silicone elastomer forms a dispersion system during emulsification, which can form a film on the lip surface, giving the product a silky application feel and a matte finish.

[0080] However, this comparative example has the following technical defects:

[0081] (1) Insufficient duration of moisturizing. Since the polyol content is only 1.5wt%, which is far below the content threshold (above 3wt%) required to form an effective "storage-slow release" system, the polyol is difficult to form a stable distribution in the system and exert a sustained moisturizing effect. According to the test, after the product of this control example was applied to the lips, a noticeable dryness appeared within 5 to 10 minutes, and there was no effective sustained moisturizing mechanism after the moisture evaporated.

[0082] (2) The silicone elastomer network structure cannot effectively encapsulate polyols. Although the water-dispersible silicone elastomer content is high (85wt%), the polyol content is too low to achieve the effect of partially embedding polyols into the three-dimensional network structure of silicone elastomers, thus failing to form a "storage-slow release" moisturizing system. Polyols are rapidly lost along with water during the evaporation process, making it difficult to maintain lip hydration for a long time.

[0083] (3) Imbalance between moisturizing performance and user experience. Although the product in this comparison case has a good airy and light feel and a soft matte finish when applied, the lack of a long-lasting moisturizing mechanism causes the lips to feel dry shortly after use, which seriously affects the overall comfort of the product and the consumer experience.

[0084] The root cause of the aforementioned shortcomings lies in the fact that while existing technologies recognize the moisturizing effect of polyols, they have not yet realized that the content of polyols in water-dispersed silicone elastomer systems needs to reach a specific threshold (3–10 wt%), and that they need to synergize with the three-dimensional network structure of the water-dispersed silicone elastomer to achieve a "storage-slow-release" type of long-lasting moisturizing effect. When the polyol content is too low, it cannot maintain a stable distribution in the system, nor can it achieve continuous release under the constraint of the silicone elastomer network, thus making it difficult to solve the drying problem after water evaporation.

[0085] The effects of an air-soft matte lip cosmetic product with long-lasting moisturizing effect from Examples 1 to 3 and its preparation method were compared with those of a control example, and the results are shown in the table below:

[0086] Comparison Projects Example 1 (80% silicone elastomer + 5% butanediol) Example 2 (75% silicone elastomer + 8% glycerin) Example 3 (85% silicone elastomer + 3% propylene glycol) Comparative example (85% silicone elastomer + 1.5% butanediol) Moisturizing duration Even 60 minutes after application, the skin remains noticeably hydrated, with a moisture content 139% of its initial level. The moisturizing effect lasted for 60 minutes after application. It can maintain hydration for up to 60 minutes after application. A noticeable dryness sensation appears 5-10 minutes after application. Improved dryness Significant improvement, no dryness or discomfort. Significant improvement, no dryness or tightness. Significant improvement, drying speed significantly reduced The dryness is noticeable and it cannot meet the need for long-lasting hydration. User experience (lightweight / soft matte / sticky) Lightweight and airy feel, soft matte finish, non-sticky The soft matte finish is pleasant, lightweight, and non-sticky. The lightweight, airy texture provides an excellent soft matte finish. It applies a light, soft mist immediately upon application, but then becomes drying, resulting in poor overall comfort. Effect of polyol content on the system With a moderate amount of polyols, they are stably embedded in the network, forming a "storage-slow release" system. Despite its high polyol content, it can still form a stable sustained-release system with good adhesion. The polyol content was low but still reached the threshold; the high-silicone elastomer network compensated for the sustained-release effect. If the polyol content is too low, it cannot be effectively embedded in the network and will be quickly lost with water. Synergistic effect of film-forming properties and moisturizing The three-dimensional network is dense, the film is flexible, and the slow release is uniform. The network structure is intact, and the release of polyols is stable. The network is denser, the release is prolonged, and it compensates for the low amount of polyols. Although it forms a film, it lacks a sustained-release mechanism, resulting in ineffective moisturizing. Formulation adaptability and industrialization value The formula is simple and easy to scale up for production. Glycerin is widely available and its cost is controllable. Propylene glycol offers flexibility in selection, adapting to different formulation needs. Traditional formulas are insufficient in moisturizing and fail to meet the market's demand for long-lasting hydration.

[0087] Compared to the control example, Examples 1-3 of the present invention, by controlling the polyol content within a specific range of 3-10 wt%, and synergizing it with the three-dimensional network structure of water-dispersible silicone elastomer (75-85 wt%), form a "storage-slow-release" long-lasting moisturizing system. In the control example, only 1.5 wt% of polyol was added, far below the effective threshold, and it could not be embedded in the silicone elastomer network, resulting in rapid loss of polyol after water evaporation, causing a noticeable dryness within 5-10 minutes. In the embodiments of the present invention, the polyol is partially embedded in the three-dimensional network. On the one hand, the network structure slows down water evaporation, and on the other hand, the polyol is continuously released under the constraint of the network, so that the lips still maintain a significant moisturizing feeling within 60 minutes after application, completely improving the defect of traditional products that are prone to drying. At the same time, all embodiments of the present invention maintain an airy and light texture and a soft matte finish, without the stickiness or heaviness caused by the increase of moisturizing ingredients. The best balance is achieved between moisturizing performance and user experience, and the choice of polyol type is flexible (glycerin, butylene glycol, and propylene glycol are all applicable), which has good prospects for industrial application.

[0088] Application examples

[0089] The lip cosmetics obtained in Example 1 were applied to actual lip makeup products for consumer use testing and instrument evaluation.

[0090] Test Method: Thirty healthy female volunteers, aged 20-45 years, were selected. The product of Example 1 was evenly applied to the lips in a constant temperature and humidity environment (temperature 25±1℃, relative humidity 50±5%). The lip skin moisture content was measured using a skin moisture meter before application, immediately after application, 30 minutes after application, and 60 minutes after application. Subjective evaluations of the user experience (including lightness, soft matte finish, and stickiness) were also conducted simultaneously.

[0091] Test Result Table

[0092] Test time point Moisture content of lip skin (relative value) User experience review Before applying 100% — Immediately after application 168% Lightweight and airy feel, with a noticeable soft matte finish. 30 minutes after application 152% It retains a soft matte finish and has no noticeable dryness. 60 minutes after application 139% The hydration lasts without any stickiness or discomfort.

[0093] Results Analysis: The test results above show that the product of Example 1 of this invention significantly increased the moisture content of the lip skin immediately after application (by 68%); 30 minutes after application, the moisture content remained at 152% of the level before application; and 60 minutes after application, the moisture content remained at 139% of the level before application. These data fully demonstrate that the product of this invention can continuously provide moisturizing effects to the lips for up to 60 minutes.

[0094] Meanwhile, all volunteers reported that the product of this invention has an excellent airy and lightweight user experience and a soft matte finish, with no stickiness or discomfort after application, achieving a good balance between moisturizing performance and user experience. This indicates that the present invention, by embedding polyols into the three-dimensional network structure of water-dispersed silicone elastomers within a specific ratio range to form a "storage-slow-release" moisturizing system, effectively solves the technical problems of traditional water-dispersed silicone elastomer products being prone to drying and having insufficient moisturizing duration, and has good practical application value.

[0095] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A soft-focus lip cosmetic with long-lasting moisturizing effect, characterized in that, The total weight of the lip cosmetic product comprises the following components: Water-dispersed silicone elastomer: 75–85 wt%; Polyols: 3–10 wt% The water-dispersible silicone elastomer comprises a polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, polydimethylsiloxane, and water, wherein the polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer is present in a content of 10-15 wt%, the polydimethylsiloxane is present in a content of 40-70 wt%, and the water is present in a content of 20-40 wt%. The polyol is selected from one or more of glycerol, butanediol, and propylene glycol; The water-dispersible silicone elastomer is formed into a silicone elastomer dispersion system with a three-dimensional network structure through an emulsification process. The polyol is at least partially embedded in the pores of the three-dimensional network structure, so that the polyol can be continuously released under the constraint of the three-dimensional network structure.

2. The air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 1, characterized in that, The water-dispersible silicone elastomer further comprises an emulsifier, the content of which in the water-dispersible silicone elastomer is 0.5 to 5 wt%.

3. The air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 1, characterized in that, The polyol is butanediol.

4. The air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 1, characterized in that, The content of the water-dispersible silicone elastomer is 78-82 wt%, and the content of the polyol is 4-6 wt%.

5. The air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 1, characterized in that, The content of the polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer in the water-dispersed silicone elastomer is 12-14 wt%, the content of polydimethylsiloxane in the water-dispersed silicone elastomer is 50-60 wt%, and the content of water in the water-dispersed silicone elastomer is 25-35 wt%.

6. The air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 1, characterized in that, The water-dispersible silicone elastomer has a content of 80 wt%, the polyol has a content of 5 wt%, and the polyol is butanediol.

7. The air-soft matte lip cosmetic with long-lasting moisturizing effect according to any one of claims 1 to 6, characterized in that, The lip cosmetic forms a continuous and flexible membrane structure after being applied to the lips.

8. A method for preparing an air-soft matte lip cosmetic with long-lasting moisturizing effect, adapted to the air-soft matte lip cosmetic with long-lasting moisturizing effect according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Preparation of water-dispersible silicone elastomer: 10-15 wt parts of polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, 40-70 wt parts of polydimethylsiloxane, 20-40 wt parts of water and 0.5-5 wt parts of emulsifier are mixed and emulsified through an emulsification process to form a silicone elastomer dispersion system with a three-dimensional network structure, thus obtaining the water-dispersible silicone elastomer; Step 2, Preparation of the composition: Mix 75-85 wt parts of the water-dispersible silicone elastomer obtained in Step 1 with 3-10 wt parts of a polyol, wherein the polyol is selected from one or more of glycerin, butylene glycol and propylene glycol, and stir evenly to obtain the lip cosmetic.

9. A method for preparing an air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 8, characterized in that, In step one, the emulsification temperature is 20–40°C, the emulsification time is 10–60 minutes, and the emulsification speed is 1000–5000 rpm.

10. A method for preparing an air-soft matte lip cosmetic with long-lasting moisturizing effect according to claim 8, characterized in that, In step two, the stirring temperature is 20–40°C, the stirring time is 5–30 minutes, and the stirring speed is 200–1000 rpm.

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