A moisturizing lipstick

Abstract

The application discloses a moisturizing lipstick and a preparation method thereof. The moisturizing lipstick comprises, in percentage by weight, 5-15% of a phase A wax base, 0.5-3% of a thickening agent, 15-30% of a phase B first oil, 10-20% of a phase B second oil, 0.5-5% of a phase C first moisturizing agent, 0.2-2% of a phase C second moisturizing agent, 0.1-1.5% of a phase C third moisturizing agent, 0.5-8% of a phase D coloring agent, 0.05-0.5% of a phase E antioxidant, and the balance of a volatile solvent. The application realizes multi-level and multi-mechanism synergistic moisturizing through constructing a double-oil-phase system of 'volatile silicone oil + non-volatile vegetable oil' and a triple moisturizing compound system of 'polyhydric alcohol humectant + sugar biological humectant + biomimetic lipid barrier repair agent'. Experiments show that the moisturizing lipstick has the advantages of a 4-hour cuticle water content increase rate of no less than 40%, no 'drying' phenomenon, good cream stability, smooth application, high color saturation, excellent moisturizing effect and makeup performance. The preparation method is simple and controllable, and is suitable for industrial production.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, and more particularly to a moisturizing lipstick, specifically a moisturizing lipstick and its preparation method. More specifically, this invention relates to an anhydrous lipstick composition and its preparation method that achieves multi-level, multi-mechanism synergistic moisturizing through the construction of a two-phase system of "volatile silicone oil + non-volatile plant oil" and a triple moisturizing complex system of "polyol hygroscopic moisturizer + saccharide bio-moisturizer + biomimetic lipid barrier repair agent". This invention also relates to the application of this moisturizing lipstick in the fields of lip care and makeup. Background Technology

[0002] Lipstick, as one of the most popular makeup categories among female consumers, occupies a pivotal position in the cosmetics market. With consumption upgrades and improved living standards, modern consumers' demands for lipstick products are no longer limited to simple color performance and makeup effect. Instead, they increasingly pursue the concept of "makeup and skincare in one," hoping that while achieving the ideal makeup effect, the product can provide continuous care and nourishment for the lips.

[0003] The skin on the lips differs significantly from the skin on other parts of the face physiologically. The epidermis of the lips is extremely thin, consisting of only 3-5 layers of keratinocytes, while the epidermis of other parts of the face typically consists of 15-20 layers. The skin on the lips lacks sebaceous and sweat glands, and cannot secrete oil and moisture to maintain surface hydration. Therefore, it is highly susceptible to external environmental factors, leading to dryness, peeling, flaking, and deepened lip lines. Traditional lipsticks primarily consist of waxes, oils, and colorants, forming a protective layer on the lips through the film-forming action of waxes and oils. However, most traditional lipsticks suffer from the following technical defects: First, the moisturizing effect is insufficient in terms of longevity. In current technology, the moisturizing effect of lipsticks mainly relies on the occlusive oil film formed by the oil components on the lip surface. While this type of oil film can reduce moisture evaporation to some extent in the initial stages of application, the lack of a continuous supply of active moisturizing ingredients means that the moisturizing effect often diminishes significantly within 1-2 hours after application, making it difficult to meet all-day moisturizing needs. Some lipsticks on the market that claim to have moisturizing effects often use polyols such as glycerin and butylene glycol added to their formulas. Although these polyols have a certain hygroscopic capacity, they are difficult to maintain stably in the lipstick formula for a long time and easily become ineffective due to evaporation after application.

[0004] Secondly, the compatibility and stability of moisturizing ingredients have limitations. Lipstick formulations are primarily oil-based systems composed of waxes and oils, while most highly effective moisturizing ingredients (such as hyaluronic acid and amino acid-based moisturizers) are hydrophilic and difficult to disperse and remain stable in oil-based systems. Directly adding water-soluble moisturizing ingredients to an oil-based system can easily lead to phase separation, precipitation, and crystallization, affecting not only the appearance and formability of the lipstick but also significantly reducing its moisturizing efficacy during storage. While existing technologies offer some solutions, such as using oil-dispersible sodium hyaluronate (e.g., Hyacolor® oil-dispersible sodium hyaluronate from Bloomage Biotech), these functional raw materials with special surface treatments are expensive, and their formulation compatibility remains limited, making it difficult to achieve synergistic compatibility of multiple moisturizing factors.

[0005] Third, there is a "drying" phenomenon. "Drying" refers to the phenomenon where, after applying lipstick, the lips become drier as the volatile solvents evaporate and the oil film ages. This phenomenon mainly stems from two reasons: First, traditional lipsticks often contain large amounts of volatile silicone oil or hydrocarbon solvents to improve application feel and film-forming speed, but these evaporate and take away heat and trace amounts of moisture from the lip surface. Second, the formula lacks moisturizing ingredients that can bind with and lock in moisture in the stratum corneum, leading to accelerated moisture loss from the lips after the oil film fails. Existing technologies have made some attempts to address "non-drying" lipsticks (such as a moisturizing lipstick disclosed in Chinese patent CN116327619A). The main idea is to reduce the content of the main emollient components and add esters to enhance the adhesion of the colorant, but this does not fundamentally solve the problems of moisture loss and sustained moisturizing.

[0006] Fourth, the depth and layering of moisturizing effects are insufficient. Existing moisturizing lipsticks often rely on a single moisturizing mechanism, either solely on the occlusive effect of oils or the hygroscopic effect of polyols, lacking a multi-layered moisturizing system design that extends from surface hydration to deep replenishment. Lip moisturizing should be a comprehensive process that simultaneously achieves: forming a good occlusive film on the lip surface to prevent moisture evaporation; delivering hygroscopic factors to the stratum corneum to bind moisture; and replenishing the lipid components needed by the stratum corneum to repair the damaged skin barrier. Current technologies lack a comprehensive solution that can simultaneously achieve these three moisturizing mechanisms.

[0007] Fifth, the makeup effect and moisturizing function of a product are difficult to coordinate. When existing moisturizing lipsticks contain a high amount of moisturizing ingredients, it often affects the lipstick's film-forming properties, adhesion, and color saturation, resulting in poor makeup effects and problems such as fading and transfer. How to achieve long-lasting moisturizing while ensuring excellent makeup effects has been a long-standing technical challenge in the field of lipstick technology.

[0008] Those skilled in the art should also recognize that the moisturizing needs of the lips differ significantly from those of facial skin. Facial skin relies on sebum secreted by sebaceous glands to form a natural protective film, while sweat secreted by sweat glands also participates in the regulation of epidermal moisture. However, the skin of the lips has neither sebaceous glands nor sweat glands, and its moisturizing depends entirely on exogenous care products. This means that lip moisturizing products must simultaneously fulfill the "sealing and locking in moisture" function of the sebum film and the "moisture absorption and water retention" function of natural moisturizing factors, which places higher demands on the formulation design of lipstick products. In the prior art, most moisturizing lipsticks only focus on one aspect of the function, making it difficult to achieve a balance between the two.

[0009] Furthermore, the lips are one of the most frequently used facial expression areas, involved in various activities daily such as speaking, eating, and changing facial expressions. The skin of the lips undergoes frequent stretching, contraction, and friction. This physiological characteristic places high demands on the film-forming and anti-migration properties of lipstick products. If the lipstick film is too fragile, it is prone to cracking and peeling during lip movements, resulting in a poor makeup effect; if the film is too rigid, it will cause a tight and uncomfortable feeling during lip movements. How to achieve long-lasting moisturizing while ensuring excellent film-forming performance is another technical challenge that urgently needs to be solved in the field of lipstick technology.

[0010] Based on consumers' actual usage needs, modern lipstick products also need to meet the following multi-dimensional performance requirements: First, color performance: lipstick needs to have highly saturated colors and good even spreadability; Second, staying power: lipstick should remain colorfast and transfer-free for a long time after application; Third, skin feel: lipstick should be smooth and easy to apply, and not sticky or tight after application; Fourth, safety: lipstick may be ingested in small amounts, therefore all components must have a high degree of safety; Fifth, stability: lipstick should maintain its stable form during storage and transportation, without softening, deformation, sweating, or precipitation. The moisturizing lipstick of this invention achieves excellent performance in all of the above dimensions, which is one of the important features that distinguishes this invention from existing technologies.

[0011] To address the problems existing in the above-mentioned technologies, there is a need to provide a moisturizing lipstick technology solution that can achieve long-lasting hydration, multi-mechanism synergy, compatibility with waterless formulas, and excellent makeup effect. Summary of the Invention

[0012] To address the shortcomings of existing technologies, the purpose of this invention is to provide a moisturizing lipstick. Specifically, the technical problems to be solved by this invention include: How to overcome the shortcomings of existing moisturizing lipsticks in terms of insufficient moisturizing duration and achieve a moisturizing effect that lasts for more than 4 hours after application; how to solve the problem of the difficulty in stable dispersion and compatibility of water-soluble high-efficiency moisturizing ingredients in oil-based lipstick systems and achieve the synergistic effect of multiple moisturizing factors; how to solve the "drying" phenomenon of traditional lipsticks and achieve a continuous increase rather than a decrease in the moisture content of the lips after application; how to build a multi-layered moisturizing system from surface water locking to deep hydration to achieve comprehensive lip care effects; and how to ensure the lipstick's formability, smoothness of application, color performance, and staying power while achieving long-lasting moisturization.

[0013] In addition, this invention also aims to solve the following technical problems: how to stably disperse polyol moisturizers, sugar moisturizers, and biomimetic moisturizers with different hydrophilicities in an oily matrix under anhydrous conditions, without relying on an aqueous phase or emulsification system; how to ensure the moisturizing effect while maintaining good morphological stability and appearance consistency of the lipstick at a high temperature of 45°C for more than 4 weeks; how to achieve a synergistic effect of triple moisturizing while keeping the subjective dryness score of the lipstick below 1.5 points (5-point rating system, the lower the score, the better) 4 hours after application; and how to achieve long-lasting moisturizing while ensuring that the lipstick's application smoothness, color saturation, and makeup staying power all reach a score of 8.5 points or higher (out of 10).

[0014] The above-mentioned objective of this invention is achieved through the following technical solutions: On one hand, this invention discloses a moisturizing lipstick, comprising the following components by weight percentage: Phase A: 5%-15% wax base, 0.5%-3% thickener; Phase B: First grease 15%-30%, Second grease 10%-20%; Phase C: First moisturizer 0.5%-5%, Second moisturizer 0.2%-2%, Third moisturizer 0.1%-1.5%; Phase D: Colorant 0.5%-8%; Phase E: Antioxidant 0.05%-0.5%; The remainder is a volatile solvent; The first oil is a volatile silicone oil, selected from one or more of cyclopentamethoxysiloxane, cyclopolydimethylsiloxane, and polydimethylsiloxane; the second oil is a non-volatile vegetable oil, selected from one or more of jojoba seed oil, meadowfoam seed oil, squalane, shea butter, and olive oil; the first moisturizer is a polyol moisturizer, selected from one or more of glycerin, 1,3-butanediol, propylene glycol, and diglyceride; the second moisturizer is a sugar moisturizer, selected from one or more of trehalose, sodium hyaluronate, and tremella polysaccharide; and the third moisturizer is a biomimetic moisturizer, selected from one or more of ceramide NP, ceramide AP, and phytosterols.

[0015] In the moisturizing lipstick of this invention, phases A, B, C, D, E, and optionally phase F together constitute a complete and synergistic functional system. Phase A (wax matrix and thickener) imparts appropriate hardness and formability to the lipstick, ensuring that the paste maintains a stable stick shape during storage and use. Phase B (volatile silicone oil and non-volatile plant oils) forms the moisturizing base of the lipstick. Volatile silicone oil provides a refreshing application feel and good spreadability in the initial application stage, while non-volatile plant oils form a continuous moisturizing protective layer after the volatile solvents evaporate. Phase C (triple moisturizing compound system) is the core technology of this invention. Through the synergistic effect of "polyol hygroscopic moisturizer + sugar bio-moisturizer + biomimetic lipid barrier repair agent," it achieves comprehensive moisturizing from surface water locking to deep hydration. Phase D (colorant) imparts rich color expression to the lipstick. Phase E (antioxidant) ensures the chemical stability of the product and prevents the oil components from oxidative rancidity during long-term storage. The aforementioned phases are not simply superimposed, but rather achieve functional unity and mutual promotion through careful component selection and proportion design.

[0016] The moisturizing lipstick of this invention preferably uses an anhydrous formula, with a water content of less than 0.5% by weight. This design brings several technical advantages: First, it avoids phase separation problems caused by the incompatibility between water and oil-based matrix, improving the uniformity and stability of the lipstick; second, it avoids the evaporation of water during high-temperature filling, ensuring the perfect appearance of the lipstick; third, it reduces the risk of microbial growth, reducing the amount of preservatives used or even eliminating the need for preservatives; fourth, it reduces the potential irritation risk of preservatives to the lip skin, improving product safety; fifth, the anhydrous formula gives the lipstick better thermal stability under high-temperature storage conditions, making it less prone to "sweating." In the prior art, most moisturizing lipsticks have to introduce an aqueous phase to add water-soluble moisturizing ingredients, which in turn requires the addition of emulsifiers and preservatives, increasing the complexity of the formulation system and potential safety risks to some extent. This invention, by using oil-dispersible sodium hyaluronate and other raw materials and a specific preparation process, successfully achieves stable dispersion of multiple moisturizing factors under anhydrous conditions, which is a significant technical breakthrough of this invention.

[0017] As a further technical solution of the present invention: in phase A, the wax matrix is ​​selected from one or more of candelilla wax, carnauba wax, beeswax, rice bran wax, and sunflower seed wax; the thickener is selected from one or more of distearate dimethylammonium lithium montmorillonite, magnesium aluminum silicate, and montmorillonite.

[0018] As a further technical solution of the present invention: by weight percentage, it also includes phase F: 0.1%-3% of functional additives, wherein the functional additives are selected from one or more of vitamin E acetate, magnesium vitamin C phosphate, coenzyme Q10, panthenol, bisabolol, centella asiatica extract, and purslane extract.

[0019] As a further technical solution of the present invention: the volatile solvent is one or more of isododecane, isohexadecane, isononyl isononanoate, and octyldodecyl alcohol, and its amount is 20%-50%.

[0020] As a further technical solution of the present invention: the weight ratio of the first moisturizer, the second moisturizer and the third moisturizer is (3-8):(1-3):(0.5-2).

[0021] As a further technical solution of the present invention: the moisturizing lipstick is an anhydrous formula, and the water content in the system is less than 0.5% by weight percentage.

[0022] As a further technical solution of the present invention: the moisturizing lipstick is a solid stick-shaped paste with a hardness value of 50-120g (25℃, needle penetration method) and a melting point of not less than 45℃.

[0023] As a further technical solution of the present invention: after the moisturizing lipstick is applied to the lips, the moisture content of the stratum corneum of the lip skin increases by no less than 80% after 30 minutes of application compared to before application, and by no less than 40% after 4 hours of application compared to before application.

[0024] In this invention, the preferred weight ratio of volatile silicone oil (first oil) to non-volatile plant oil (second oil) is (1.5-2.5):1, more preferably (1.8-2.2):1. The inventors have discovered that when the weight ratio of the first oil to the second oil falls within this range, the initial refreshing feel of the lipstick and its subsequent long-lasting moisturizing properties achieve the best balance. If the relative proportion of volatile silicone oil is too high (i.e., first oil / second oil > 2.5), the oil film becomes too thin after the volatile solvent evaporates, resulting in decreased moisturizing and makeup-holding performance, and noticeable dryness appears on the lips approximately 2 hours after application. If the relative proportion of volatile silicone oil is too low (i.e., first oil / second oil < 1.5), the initial skin feel is too oily and heavy, and insufficient volatility leads to slow film formation, easily causing transfer and color fading. Optimization and verification have shown that a weight ratio of approximately 2:1 for the first oil to the second oil provides the optimal overall performance.

[0025] In this invention, the wax matrix is ​​preferably a mixture of candelilla wax, carnauba wax, and beeswax, with a preferred weight ratio of (2-4):(1-2):(1-3). Through extensive experimentation, the inventors have discovered that this specific wax mixture ratio achieves optimal hardness, gloss, and thermal stability of the lipstick. Candelilla wax possesses excellent shapeability and gloss, making it a major contributor to the lipstick's gloss. Carnauba wax has high hardness and a high melting point (80℃-86℃), effectively improving the high-temperature stability of the lipstick and preventing softening and deformation during storage and transportation in summer or tropical regions. Beeswax has excellent flexibility and emulsifying properties, improving the smoothness of application and aiding in the dispersion of moisturizing ingredients in the oily matrix. When the three waxes are used in the above ratio, a synergistic effect is achieved, resulting in a significantly superior overall performance compared to using any single wax alone or a simple combination of any two waxes.

[0026] In this invention, the non-volatile plant oil is preferably a blend of jojoba seed oil, squalane, and shea butter. Jojoba seed oil is chemically very similar to human sebum, allowing it to quickly penetrate the skin without leaving a greasy feeling, providing immediate moisturization to the lips. Squalane, a natural component of sebum, has excellent moisturizing and antioxidant properties, forming a protective film on the lip surface to continuously lock in moisture. Shea butter is rich in triterpenoid esters, phytosterols, and vitamin E, possessing excellent moisturizing, repairing, and antioxidant effects, making it particularly suitable for dry, damaged lip skin. The combined use of these three plant oils forms a dense yet breathable moisturizing film after the volatile silicone oil evaporates, continuously providing moisturizing protection to the lips. Its synergistic moisturizing effect is significantly superior to using any one of the plant oils alone.

[0027] In this invention, the preferred weight ratio of the first moisturizer (polyol moisturizer), the second moisturizer (saccharide moisturizer), and the third moisturizer (biomimetic moisturizer) is (3-8):(1-3):(0.5-2), more preferably (4-6):(1.5-2.5):(0.8-1.5). Through extensive formulation screening experiments, the inventors discovered that the synergistic effect is most significant when the weight ratio of the three moisturizers falls within this range. Experimental verification shows that when the weight ratio of the first, second, and third moisturizers is approximately 5:2:1 (e.g., in Example 1, approximately 4% glycerin + 1,3-butanediol, approximately 1.3% trehalose + sodium hyaluronate, and approximately 0.7% ceramide + phytosterols), the stratum corneum moisture content increases by 52.8% after 4 hours of application, maintains an increase of 36.5% after 6 hours, and achieves a subjective dryness score of 1.4 after 4 hours, demonstrating optimal overall performance. If the proportion of the first moisturizer is too high, the balm will be too hygroscopic and may "sweat" when stored in a high temperature and high humidity environment, and may feel sticky on the lips after application; if the proportion of the second or third moisturizer is too low, the moisturizing effect and barrier repair effect will be significantly reduced.

[0028] This invention combines polyol-based moisturizers, sugar-based moisturizers, and biomimetic moisturizers in a specific ratio, resulting in a significant synergistic effect. The overall moisturizing effect far exceeds the simple sum of the individual components. Specifically, the polyol-based moisturizer provides rapid hydration ("water absorption"), the sugar-based moisturizer forms a long-lasting moisture-retaining film ("water retention"), and the biomimetic moisturizer repairs the damaged lip barrier at its source ("water locking"). Together, they form a complete moisturizing chain of "water absorption-water retention-water locking." This synergistic mechanism provides a solid theoretical foundation for the inventiveness of this invention.

[0029] In the moisturizing lipstick of this invention, the total amount of wax base is 5%-15%. Through systematic research, the inventors determined that when the amount of wax base is less than 5%, the lipstick is too soft and difficult to maintain its stick shape, potentially bending and deforming at normal operating temperatures (25℃-35℃), and softening and "sweating" more easily during high-temperature storage (45℃). When the amount of wax base is greater than 15%, the lipstick is too hard, increasing resistance during application, reducing smoothness, and potentially causing friction damage to the lip skin. Furthermore, excessive wax content reduces the lipstick's moisturizing effect. Optimization and verification showed that an amount of wax base of 8%-12% yields the best overall performance.

[0030] In the moisturizing lipstick of this invention, the amount of volatile solvent (such as isododecane) is 20%-50%, preferably 25%-40%. The volatile solvent plays multiple roles in the lipstick system: firstly, as a viscosity modifier, it reduces the melt viscosity of the lipstick, facilitating smooth filling during the casting process; secondly, as an application promoter, it provides good spreadability and smoothness when the lipstick is applied to the lips; thirdly, as a film-forming aid, the evaporation process of the volatile solvent promotes rapid film formation of the lipstick on the lips. Through experiments, the inventors have found that when the amount of volatile solvent is less than 20%, the melt viscosity of the lipstick is too high, making casting difficult, and the spreadability during application is poor, easily leading to uneven application; when the amount of volatile solvent is greater than 50%, the oil film after evaporation is too thin, reducing moisturizing and makeup-holding performance, and the shrinkage rate of the lipstick during cooling and molding in the mold is too large, easily causing cracks.

[0031] In the moisturizing lipstick of this invention, the amount of thickener (selected from one or more of distearate, lithium dimethylammonium montmorillonite, magnesium aluminum silicate, and montmorillonite) is 0.5%-3%. The main function of the thickener is to form a thixotropic network structure in the oily system through its unique layered silicate lamellar structure, significantly improving the rheological properties and spreadability of the lipstick. The inventors have discovered that the addition of the thickener not only adjusts the smoothness of the lipstick application but also absorbs a certain amount of oil, adjusting the greasiness of the product and giving the lipstick a refreshing and non-sticky feel after application. When the amount of thickener is less than 0.5%, the thixotropic network structure is incomplete, and the improvement in smoothness is not significant; when the amount of thickener is greater than 3%, the lipstick is too thick, making casting difficult, and a powdery or residue-like feeling may occur after application.

[0032] In the moisturizing lipstick of this invention, the amount of antioxidant is 0.05%-0.5%, preferably one or more of tocopherol (vitamin E), tocopheryl acetate, butylated hydroxytoluene (BHT), and butylated hydroxyanisole (BHA). Tocopherol is a naturally sourced antioxidant that not only prevents the oxidative rancidity of oily components and extends the shelf life of the product, but also nourishes the lip skin and protects the lips from free radical damage. The inventors have discovered that when tocopherol is used in combination with plant oils (especially jojoba seed oil and meadowfoam seed oil rich in unsaturated fatty acids), tocopherol can also exert a synergistic effect, enhancing the stability and moisturizing effect of the plant oils.

[0033] On the other hand, the present invention also discloses a method for preparing a moisturizing lipstick as described above, comprising the following steps: Step 1: Add phase A to the first reaction vessel, heat to 85℃-95℃, and stir until completely melted to obtain the molten wax phase; Step 2: Add the second oil from phase B to the second reaction vessel, heat to 75℃-85℃, then add the first oil from phase B, stir evenly to obtain an oil phase mixture; Step 3: After premixing the first and second humectants in phase C evenly, add them to the oil phase mixture obtained in step 2 under stirring conditions, then add the third humectant and continue stirring until completely dispersed and evenly dispersed to obtain the moisturizing oil phase; Step 4: Add the D phase colorant to the moisturizing oil phase obtained in Step 3, and grind it with a three-roll mill until the particle size is uniform to obtain the colored oil phase; Step 5: Mix the molten wax phase obtained in Step 1 with the coloring oil phase obtained in Step 4 at 75℃-85℃, add the E phase antioxidant and optional F phase functional additives, stir evenly, degas, and obtain the lipstick mixture. Step 6: Pour the lipstick mixture obtained in Step 5 into the mold at 70℃-80℃, cool and solidify, and then demold to obtain the moisturizing lipstick.

[0034] As a further technical solution of the present invention: in step three, the third moisturizer is dissolved or dispersed in a small amount of the second oil at 40℃-50℃ before being added.

[0035] In the preparation method of this invention, temperature control in each step is crucial. In step one, phase A is heated to 85°C-95°C. If the melting temperature is below 85°C, natural waxes such as candelilla wax and carnauba wax may not melt completely, affecting the uniformity and formability of the paste. If the melting temperature is above 95°C, heat-sensitive components (such as unsaturated fatty acids in vegetable oils and functional additives) may oxidize or degrade. In step two, the second oil is heated to 75°C-85°C, followed by the addition of the first oil (volatile silicone oil). The heating temperature should not be too high to avoid accelerated evaporation loss of the volatile silicone oil due to overheating. In step three, the third moisturizer (especially ceramides) is pre-dissolved or dispersed in a small amount of the second oil at 40°C-50°C before addition. This pre-dispersion step can significantly improve the dispersion uniformity of ceramides in the oil phase. Ceramides are amphiphilic (possessing both hydrophilic and lipophilic groups), and proper pre-dissolution allows them to distribute better in the oil / water interface region, thereby achieving a better barrier repair effect after lip application. In step five, the mixing temperature of the molten wax phase and the coloring oil phase is controlled between 75℃ and 85℃. If the mixing temperature is below 75℃, the wax phase may partially solidify, leading to uneven mixing; if the mixing temperature is above 85℃, the risk of degradation of the heat-sensitive components increases. In step six, the pouring temperature is controlled between 70℃ and 80℃. If the pouring temperature is too high, the shrinkage rate of the paste during cooling will be too large, easily causing cracks or depressions; if the pouring temperature is too low, the mixture will lack fluidity and will be difficult to fill the mold. The temperature selection of this invention has been systematically optimized and verified, ensuring that while ensuring sufficient melting and mixing of each component, the activity and stability of each component are maintained to the maximum extent.

[0036] In the preparation method of this invention, the step three, "premixing the first and second humectants in phase C uniformly," is of significant technical importance. Both the first humectant (polyol) and the second humectant (saccharide) are hydrophilic substances and are difficult to disperse in an oily matrix. By premixing them uniformly, the polyol humectant can form a "wetting" layer on the surface of the sugar humectant particles, improving its interfacial compatibility with the oily matrix and thus promoting their dispersion in the oil phase. The inventors have found that the humectant combination after premixing can form a more uniform dispersion system in the oil phase, significantly improving the stability and moisturizing effect of the ointment. If the first and second humectants are added directly to the oil phase separately, local agglomeration easily occurs, affecting the dispersion effect.

[0037] In a preferred embodiment of the present invention, after the moisturizing lipstick is applied to the lips, the moisture content of the stratum corneum of the lip skin increases by no less than 80% after 30 minutes of application compared to before application, and by no less than 40% after 4 hours of application compared to before application. This moisturizing performance indicator is one of the important features that distinguishes the present invention from the prior art. Experimental verification shows that the moisture content increases by 85.6%, 83.2%, and 88.3% after 30 minutes of application, and by 52.8%, 50.6%, and 55.2% after 4 hours, respectively, all meeting the above-mentioned requirements. In contrast, the prior art product (Comparative Example 4) shows a moisture content increase of 42.6% after 30 minutes of application and only 15.2% after 4 hours, far lower than the performance indicators of the present invention.

[0038] In a preferred embodiment of the present invention, the moisturizing lipstick is a solid stick-shaped paste with a hardness of 50-120g (25°C, needle penetration method) and a melting point not lower than 45°C. Within this hardness range, the paste is neither too soft to deform during storage or transportation, nor too hard to affect the smoothness of application. Optimization and verification have shown that the paste hardness is preferably 70-100g, and the melting point is preferably not lower than 48°C. The hardness values ​​of Examples 1-3 of the present invention are 2.5-3.0mm (needle penetration depth, corresponding to a hardness value of approximately 70-100g), and the melting points are 47.8°C-49.2°C, all meeting the above-mentioned requirements.

[0039] In a preferred embodiment of the present invention, the moisturizing lipstick further includes phase F: 0.1%-3% of functional additives. The addition of functional additives can further enhance the product's comprehensive effects such as moisturizing, repairing, anti-inflammatory, and antioxidant properties. Among them, bisabolol is a natural anti-inflammatory component extracted from German chamomile, which can effectively soothe inflammatory reactions of the lip skin and alleviate discomfort caused by dryness; Centella asiatica extract contains active ingredients such as asiaticoside and hydroxyasiaticoside, which can promote collagen synthesis and accelerate skin repair; panthenol (vitamin B5) can penetrate into the stratum corneum, be converted into pantothenic acid, and participate in cell metabolism, promoting the repair and regeneration of the skin barrier. The above-mentioned functional additives, when used in conjunction with the existing triple moisturizing compound system of the present invention, can produce a synergistic effect, further enhancing the product's comprehensive care efficacy.

[0040] In a preferred embodiment of the present invention, the moisturizing lipstick is an anhydrous formula, with a water content of less than 0.5% by weight, more preferably less than 0.3%, and most preferably less than 0.1%. The present invention successfully achieves stable dispersion of water-soluble moisturizing factors under anhydrous conditions by using oil-dispersible sodium hyaluronate (such as Hyacolor® series products from Bloomage Biotechnology) and other raw materials. The oil-dispersible sodium hyaluronate is produced using a patented microsphere encapsulation technology, uniformly and stably dispersing sodium hyaluronate in the form of micropowder within an oily matrix, facilitating its addition to anhydrous formulations such as lipsticks and lip balms. In the formulation system of the present invention, the oil-dispersible sodium hyaluronate, volatile silicone oil, non-volatile plant oils, and polyol moisturizers work together to form a stable oily dispersion system. Accelerated stability testing verified that the product of the present invention, after being stored at 40°C and 75% relative humidity for 3 months, showed no significant changes in appearance, color, odor, or moisturizing efficacy, proving the success of the anhydrous formulation design.

[0041] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects: Significant and long-lasting moisturizing effect: This invention achieves multi-level and multi-mechanism synergistic moisturizing by constructing a triple moisturizing complex system of "polyols + sugars + biomimetic lipids". Polyol moisturizers capture moisture from the environment through hygroscopic action, sugar moisturizers form a water-retaining film on the skin surface to reduce water evaporation, and biomimetic lipids structurally repair the damaged skin barrier. The synergistic effect of these three components continuously increases the moisture content of the lip stratum corneum. Experimental data shows that after using the moisturizing lipstick of this invention, the moisture content of the lip skin stratum corneum increases by more than 80% after 30 minutes, and the increase rate remains above 40% after 4 hours, demonstrating a significantly superior moisturizing effect compared to similar products on the market.

[0042] This invention effectively solves the "drying" problem: through a rational ratio of volatile silicone oil and non-volatile plant oils, and an innovative design in the moisturizing system, it fundamentally avoids the dryness problem caused by solvent evaporation after traditional lipsticks are applied. Instead, after the volatile solvents evaporate, the lipstick of this invention leaves a moisturizing protective layer on the lips composed of plant oils and multiple moisturizing factors, continuously replenishing the lips with moisture and lipids.

[0043] This invention achieves stable formulation of highly effective moisturizing ingredients in an oil-based system: Through specific formulation design and preparation process, it successfully disperses water-soluble polyols, sugar-based moisturizers, and biomimetic lipid components such as ceramides in an oil-based matrix primarily composed of waxes and oils, achieving a long-term stable cream state without the need for expensive polymer encapsulation technology. Accelerated stability testing verified that the product showed no significant changes in appearance, color, odor, or moisturizing efficacy after storage for 3 months at 40°C and 75% relative humidity.

[0044] It also boasts excellent makeup performance: the moisturizing lipstick of this invention achieves long-lasting hydration while maintaining good makeup performance. The texture is smooth and easy to apply, with high color saturation, forming an even and long-lasting color film on the lips, and has good anti-migration properties (i.e., it does not transfer to cups).

[0045] The formula is safe and gentle: all components of this invention are made from safe ingredients recognized in the cosmetics industry, mainly natural plant oils, plant waxes and moisturizing ingredients derived from bio-fermentation. It does not contain preservatives, fragrances or other ingredients that may cause irritation, making it especially suitable for people with sensitive lips.

[0046] The preparation process is simple and controllable, making it suitable for industrial production: The preparation method of this invention does not involve complex equipment or harsh process conditions, the operation steps are clear, the process parameters are easy to control, and it has good prospects for industrial application. Detailed Implementation

[0047] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0048] Through long-term research and extensive experimentation, the inventors unexpectedly discovered that by compounding volatile silicone oil and non-volatile plant oils in a specific ratio to form an oil system, and simultaneously combining polyol moisturizers, sugar moisturizers, and biomimetic moisturizers in a specific ratio to form a "triple moisturizing compound system," and stably dispersing it in an oil-based carrier with a specific wax matrix, a surprising combination of long-lasting moisturizing and excellent makeup effect can be achieved. Based on this, the inventors completed this invention.

[0049] Specifically, the present invention provides a moisturizing lipstick, comprising the following components by weight percentage: Phase A: 5%-15% wax base, 0.5%-3% thickener; Phase B: First grease 15%-30%, Second grease 10%-20%; Phase C: First moisturizer 0.5%-5%, Second moisturizer 0.2%-2%, Third moisturizer 0.1%-1.5%; Phase D: Colorant 0.5%-8%; Phase E: Antioxidant 0.05%-0.5%; The remainder is a volatile solvent.

[0050] In the formulation system of this invention, the functions and mechanisms of action of each component are as follows: (a) Phase A: Paste forming system The wax matrix is ​​a core component constituting the skeletal structure of lipstick, and its function is to give the lipstick appropriate hardness, shape retention, and thermal stability. In this invention, the amount of wax matrix used is 5%-15%. If the amount of wax matrix is ​​less than 5%, the lipstick is too soft and difficult to maintain its stick shape, and it is prone to deformation or "sweating" when stored at high temperatures; if the amount is more than 15%, the lipstick is too hard, increasing resistance during application, reducing smoothness, and may cause friction damage to the lip skin.

[0051] In this invention, the wax matrix is ​​preferably selected from one or more of candelilla wax, carnauba wax, beeswax, rice bran wax, and sunflower seed wax. These naturally derived waxes have suitable melting points and hardness, and good compatibility with oil systems. In particular, candelilla wax has excellent plasticity and gloss, carnauba wax has high hardness and melting point (80℃-86℃), which can effectively improve the high-temperature stability of the paste, while beeswax has excellent flexibility and emulsifying properties. Through the compound use of the above waxes, an optimal balance of hardness, flexibility, and thermal stability can be achieved.

[0052] The addition of thickeners is mainly used to adjust the rheological properties and spreadability of the paste. The thickeners used in this invention are selected from one or more of distearate, lithium dimethylammonium montmorillonite, magnesium aluminum silicate, and montmorillonite. These layered silicate minerals have a unique lamellar structure, which can form a thixotropic network structure in oily systems, significantly improving the smoothness of the paste application and its spreadability on the lips, while also absorbing a certain amount of oil and adjusting the greasiness of the product.

[0053] (ii) Phase B: Oil-based moisturizing system This invention employs a two-phase oil system, namely a compound system of volatile silicone oil (first oil) and non-volatile vegetable oil (second oil).

[0054] The first oil is a volatile silicone oil, selected from one or more of cyclopentamethoxysiloxane, cyclopolydimethylsiloxane, and polydimethylsiloxane, used in an amount of 15%-30%. The volatile silicone oil gradually evaporates shortly after the lipstick is applied to the lips, providing a refreshing feel and good spreadability. It also helps the lipstick form a uniform thin layer after evaporation, aiding in the even adhesion and film formation of the pigment. If the amount of the first oil is less than 15%, the evaporation effect is not obvious, and the skin feel is too oily and heavy after application; if the amount is more than 30%, the oil film after evaporation is too thin, reducing moisturizing and makeup-holding properties.

[0055] The second oil is a non-volatile plant oil, selected from one or more of jojoba seed oil, meadowfoam seed oil, squalane, shea butter, and olive oil, used in an amount of 10%-20%. These plant oils have a chemical composition similar to human sebum, exhibiting excellent skin affinity and permeability. They can form a continuous moisturizing film on the lip surface, providing long-lasting hydration. Jojoba seed oil is chemically very similar to human sebum, allowing it to quickly penetrate the skin without leaving a greasy feeling; squalane is a natural component of sebum, possessing excellent moisturizing and antioxidant properties; meadowfoam seed oil contains over 98% long-chain fatty acids, exhibiting excellent oxidative stability and film-forming properties. The combined use of these plant oils forms a dense yet breathable moisturizing film after the volatile silicone oil evaporates, continuously providing moisturizing protection for the lips.

[0056] (III) Phase C: Triple moisturizing compound system Phase C is the core innovation of this invention. This invention constructs a triple moisturizing compound system consisting of "polyol-based hygroscopic moisturizer + saccharide-based bio-moisturizer + biomimetic lipid barrier repair agent".

[0057] The first moisturizer is a polyol-based moisturizer, selected from one or more of glycerin, 1,3-butanediol, propylene glycol, and diglycerides, used in an amount of 0.5%-5%. Polyol-based moisturizers have strong hygroscopic properties, capable of absorbing moisture from the environment and retaining it in the stratum corneum. Among them, glycerin is one of the most classic moisturizing ingredients, capable of forming hydrogen bonds with water molecules and exhibiting excellent water retention capacity. However, when polyols such as glycerin are directly added to traditional lipstick formulations, the incompatibility between polyols and oily bases can easily lead to softening, separation, or "sweating" of the lipstick. This invention achieves stable dispersion of polyol-based moisturizers through a specific formulation system and preparation process.

[0058] The second moisturizer is a saccharide moisturizer, selected from one or more of trehalose, sodium hyaluronate, and tremella polysaccharide, used at a dosage of 0.2%-2%. Saccharide moisturizers are a class of naturally derived biological moisturizing factors with unique water-retention mechanisms. Trehalose is a non-reducing disaccharide that can form a protective film on the cell surface, effectively preventing water evaporation and protein denaturation; its moisturizing performance is superior to traditional polyols. Sodium hyaluronate is a glycosaminoglycan naturally found in human skin with extremely strong water-retention capacity (each gram of hyaluronic acid can bind approximately 6 liters of water), forming a three-dimensional network structure in the stratum corneum to bind a large amount of water. Tremella polysaccharide is a natural high-molecular-weight polysaccharide extracted from the fruiting body of Tremella fuciformis, possessing excellent film-forming and water-retention properties, as well as antioxidant and anti-inflammatory effects.

[0059] The third moisturizer is a biomimetic moisturizer, selected from one or more of ceramides (NP), ceramides (AP), and phytosterols, used at a dosage of 0.1%-1.5%. Ceramides are the main component of intercellular lipids in the stratum corneum (accounting for approximately 40%-50% of the total lipids in the stratum corneum) and play a crucial role in maintaining skin barrier function. Lip skin lacks sebaceous glands, making it prone to lipid loss from the stratum corneum, leading to skin barrier damage and accelerated moisture evaporation. Supplementing with exogenous ceramides can repair the damaged lipid structure of the stratum corneum, restore skin barrier function, and thus fundamentally improve lip dryness. Phytosterols are chemically similar to cholesterol and can replace cholesterol components in the stratum corneum, participating in the construction of an ordered lipid bilayer structure.

[0060] The inventors discovered that the three different types of moisturizers mentioned above do not simply stack, but rather produce a significant synergistic effect. Polyol moisturizers provide rapid hydration, sugar moisturizers form a long-lasting moisture-retaining film, and biomimetic moisturizers repair the damaged lip barrier at its source. When combined in a specific ratio, they achieve comprehensive moisturizing from surface hydration to deep hydration. Experiments have verified that the synergistic effect is most significant when the weight ratio of the first, second, and third moisturizers is controlled within the range of (3-8):(1-3):(0.5-2).

[0061] (iv) D phase: coloring system Colorants are essential components in lipstick products that impart color to the lips. In this invention, the amount of colorant used is 0.5%-8%, which can be adjusted according to the depth of the target shade. Usable colorants include, but are not limited to, CI 15850 (lake red), CI77491 (iron oxide red), CI 77492 (iron oxide yellow), CI 77499 (iron oxide black), CI 77891 (titanium dioxide), CI75470 (carmine), and CI 45380 (acid red). In practical use, colorants that have undergone ball milling or surface treatment are preferred to improve their dispersibility and color saturation in oil-based systems.

[0062] (V) Phase E: Antioxidant System The addition of antioxidants aims to prevent oxidative rancidity of oily components during long-term storage, extend the product's shelf life, and protect the lip skin from free radical damage. In this invention, the amount of antioxidant used is 0.05%-0.5%, preferably one or more of tocopherol (vitamin E), tocopherol acetate, butylated hydroxytoluene (BHT), and butylated hydroxyanisole (BHA).

[0063] (vi) Volatile solvents Volatile solvents are important components in lipstick systems used to adjust viscosity and application feel. In this invention, the volatile solvent is selected from one or more of isododecane, isohexadecane, isononyl isononanoate, and octyldodecanool, and is used in an amount of 20%-50%. The volatile solvent gradually evaporates after the lipstick is applied to the lips, leaving behind effective film-forming components. Isododecane is a highly branched hydrocarbon solvent with excellent evaporation rate and a refreshing feel, and is a widely used solvent in lipstick and lip gloss products.

[0064] It should be noted that the moisturizing lipstick of this invention preferably has an anhydrous formula, with a water content of less than 0.5% by weight. This is because the presence of water may cause the following problems: incompatibility between water and oil-based systems leads to phase separation; water evaporates during high-temperature filling, generating bubbles and affecting the appearance of the lipstick; water may promote microbial growth, increasing the burden on the preservative system. This invention, through ingenious formula design, achieves stable dispersion of various water-soluble moisturizing ingredients in an oil-based system without relying on water as a solvent or carrier, which is one of the key technological breakthroughs of this invention.

[0065] In a preferred embodiment of the present invention, the wax matrix in phase A is a compound mixture of candelilla wax, carnauba wax, and beeswax, with a weight ratio of (2-4):(1-2):(1-3). Experiments show that this compound ratio can achieve the best hardness, gloss, and thermal stability of the paste.

[0066] In another preferred embodiment of the invention, the weight ratio of the first oil to the second oil in phase B is (1.5-2.5):1. At this ratio, the initial refreshing feel of the lipstick and its subsequent long-lasting moisturizing properties are optimally balanced.

[0067] In another preferred embodiment of the present invention, the moisturizing lipstick further includes phase F: 0.1%-3% of functional additives. The functional additives are selected from one or more of vitamin E acetate, magnesium vitamin C phosphate, coenzyme Q10, panthenol, bisabolol, centella asiatica extract, and purslane extract. These functional additives can further enhance the product's comprehensive effects such as moisturizing, repairing, anti-inflammatory, and antioxidant properties.

[0068] In another preferred embodiment of the invention, the moisturizing lipstick is a solid stick-shaped paste with a hardness of 50-120g (25°C, penetration test) and a melting point of not less than 45°C. Within this hardness range, the paste is neither too soft to deform during storage or transportation, nor too hard to affect the smoothness of application.

[0069] In another preferred embodiment of the present invention, after the moisturizing lipstick is applied to the lips, the moisture content of the stratum corneum of the lip skin increases by no less than 80% at 30 minutes after application compared to before application, and by no less than 40% at 4 hours after application compared to before application.

[0070] This invention also provides a method for preparing the above-mentioned moisturizing lipstick, comprising the following steps: Step 1: Wax Phase Melting. Add phase A components (wax matrix and thickener) to the first reaction vessel, heat to 85℃-95℃, and stir until completely melted to obtain the molten wax phase. The preferred stirring speed is 300-600 rpm.

[0071] Step 2: Oil phase preparation. The second oil (non-volatile vegetable oil) in phase B is added to the second reaction vessel and heated to 75℃-85℃. Then the first oil (volatile silicone oil) in phase B is added and stirred evenly to obtain an oil phase mixture.

[0072] Step 3: Moisturizer Dispersion. After premixing the first moisturizer (polyols) and second moisturizer (saccharides) from phase C evenly, slowly add them to the oil phase mixture obtained in Step 2 under stirring. Then add the third moisturizer (biomimetic moisturizer) and continue stirring until completely dispersed and homogeneous, obtaining the moisturizing oil phase. In this step, the third moisturizer (especially ceramides) can be pre-dissolved or dispersed in a small amount of the second oil at 40℃-50℃ before addition to improve its dispersion uniformity in the oil phase. Ceramides are amphiphilic; proper pre-dissolution allows them to better distribute in the oil / water interface region, thereby exerting a better barrier repair effect.

[0073] Step 4: Colorant Dispersion. Add the D-phase colorant to the moisturizing oil phase obtained in Step 3, and mill using a three-roll mill 2-4 times until the particle size is uniform (average particle size not greater than 10μm) to obtain the colored oil phase. If the initial particle size of the colorant is large, it can be pre-ball-milled.

[0074] Step 5: Final Mixing. The molten wax phase obtained in Step 1 and the coloring oil phase obtained in Step 4 are mixed at 75℃-85℃. The E phase antioxidant and optional F phase functional additives are added, stirred evenly, and degassed under vacuum to obtain the lipstick mixture.

[0075] Step Six: Casting and Molding. Pour the lipstick mixture obtained in Step Five into the mold at 70℃-80℃, cool and solidify (preferably at 4℃-10℃ for 15-30 minutes), and demold to obtain the moisturizing lipstick.

[0076] In the above preparation method, temperature control at each step is crucial. If the melting temperature is too low, the waxes cannot melt completely, affecting the uniformity of the paste; if the melting temperature is too high, heat-sensitive components (such as unsaturated fatty acids in vegetable oils, functional additives, etc.) may oxidize or degrade. The temperature selection of this invention has been optimized and verified, ensuring that the components are fully melted and mixed while maximizing the preservation of their activity and stability.

[0077] Unless otherwise specified, all raw materials used in the following examples and comparative examples are commercially available products in the cosmetics industry. Specific sources are as follows: Candelilla wax: purchased from Nanjing Huashi New Materials Co., Ltd., cosmetic grade; Brazilian palm wax: purchased from Croda, cosmetic grade; Beeswax: Purchased from Bienen, Germany, cosmetic grade; Distearate dimethylammonium lithium montmorillonite: purchased from BASF, trade name Bentone 38V; Cyclopentadimethylsiloxane: purchased from Dow Corning, USA, grade DC 245; Jojoba seed oil: purchased from Croda, cosmetic grade; Squalane: Purchased from Maruzen Pharmaceutical Co., Ltd., Japan; cosmetic grade. Shea butter: Purchased from AAK, Sweden, cosmetic grade; Glycerin: Purchased from Emery Company, Malaysia, cosmetic grade; 1,3-Butanediol: Purchased from Daicel Corporation, Japan, cosmetic grade; Trehalose: Purchased from Hayashibara Corporation, Japan; cosmetic grade. Sodium hyaluronate (oil-dispersible type): purchased from Bloomage Biotechnology Co., Ltd., Hyacolor® series, molecular weight 500,000-1,000,000 Daltons; Ceramide NP: Purchased from Evonik GmbH, Germany, under the trade name Sphingoceryl; Phytosterols: Purchased from Nippon Fine Chemical Co., Ltd., Japan, under the trade name Phytosterol; Colorant (CI 15850): Purchased from Merck, Germany, cosmetic grade; Tocopherol (Vitamin E): Purchased from BASF, cosmetic grade; Isododecane: Purchased from Dow Corning, USA, grade DC 246. Example 1

[0078] A moisturizing lipstick, by weight percentage, the moisturizing lipstick of Example 1 comprises: Phase A: 4.0% candelilla wax, 2.0% carnauba wax, 3.0% beeswax, 1.0% distearate dimethylammonium lithium montmorillonite; Phase B: 22.0% cyclopentamethoxysiloxane (DC245), 8.0% jojoba seed oil, 5.0% squalane, 2.0% shea butter; Phase C: 2.5% glycerin, 1.5% 1,3-butanediol, 1.0% trehalose, 0.3% sodium hyaluronate (oil-dispersed type), 0.5% ceramide NP, 0.2% phytosterols; Phase D: CI15850 (lake red) 4.0%; Phase E: 0.2% tocopherol; the balance is isododecane to bring the total to 100%.

[0079] The method for preparing the moisturizing lipstick in this embodiment is as follows: (1) Add 4.0g of candelilla wax, 2.0g of carnauba wax, 3.0g of beeswax and 1.0g of distearate dimethylammonium lithium montmorillonite to the first beaker, heat to 90℃, and stir at 400rpm until completely melted to obtain the molten wax phase.

[0080] (2) Add 8.0g of jojoba seed oil, 5.0g of squalane and 2.0g of shea butter of phase B to the second beaker, heat to 80°C, then add 22.0g of cyclopentamethoxysiloxane and stir evenly to obtain an oil phase mixture.

[0081] (3) Mix 2.5g of glycerol, 1.5g of 1,3-butanediol and 1.0g of trehalose in phase C evenly, and slowly add them to the oil phase mixture obtained in step (2) under stirring, and continue stirring for 10 minutes. Then, dissolve 0.5g of ceramide NP and 0.2g of phytosterol in a small amount (about 1g) of jojoba seed oil at 45°C, and add them to the above mixture, and continue stirring until completely dispersed and even to obtain the moisturizing oil phase.

[0082] (4) Add 4.0g of CI 15850 colorant of phase D to the moisturizing oil phase obtained in step (3), and grind it 3 times with a three-roll mill until the average particle size is no more than 10μm to obtain the colored oil phase.

[0083] (5) Mix the molten wax phase obtained in step (1) with the coloring oil phase obtained in step (4) at 80°C, add 0.2g of tocopherol in phase E, and make up to 100g with isododecane. Stir evenly and degas under vacuum to obtain lipstick mixture.

[0084] (6) Pour the lipstick mixture obtained in step (5) into the lipstick mold at 75°C, cool it at 8°C for 20 minutes, and demold to obtain the moisturizing lipstick sample. Example 2

[0085] A moisturizing lipstick, by weight percentage, the moisturizing lipstick of Example 2 comprises: Phase A: 5.0% candelilla wax, 2.5% carnauba wax, 2.5% beeswax, 1.5% distearate dimethylammonium montmorillonite; Phase B: 18.0% cyclopentasiloxane (DC245), 10.0% jojoba seed oil, 6.0% squalane; Phase C: 3.0% glycerin, 1.0% propylene glycol, 1.5% trehalose, 0.2% tremella polysaccharide, 0.6% ceramide AP; Phase D: 5.0% CI 15850 (lake red); Phase E: 0.3% tocopherol; the balance is isododecane to bring the total to 100%.

[0086] The preparation method of the moisturizing lipstick in this embodiment is the same as that in Embodiment 1. Example 3

[0087] A moisturizing lipstick, by weight percentage, the moisturizing lipstick of Example 3 comprises: Phase A: 3.5% candelilla wax, 1.5% carnauba wax, 4.0% beeswax, 1.0% distearate dimethylammonium lithium montmorillonite; Phase B: 25.0% cyclopentasiloxane (DC245), 7.0% jojoba seed oil, 4.0% meadowfoam seed oil, 3.0% shea butter; Phase C: 2.0% glycerin, 1.0% diglyceride, 0.8% trehalose, 0.2% sodium hyaluronate (oil-dispersed type), 0.4% ceramide NP, 0.3% phytosterols; Phase D: CI15850 (lake red) 3.5%; Phase E: 0.2% tocopherol; Phase F: 0.2% bisabolol, 0.5% centella asiatica extract; the balance is isododecane to bring the total to 100%.

[0088] The preparation method of the moisturizing lipstick in this embodiment is the same as that in embodiment 1, wherein the F phase functional additive is added in step (5). Example 4

[0089] A moisturizing lipstick, by weight percentage, the moisturizing lipstick of Example 4 comprises: Phase A: 4.5% candelilla wax, 2.0% carnauba wax, 2.5% beeswax, 1.2% distearate dimethylammonium montmorillonite; Phase B: 20.0% cyclopentamethoxysiloxane (DC245), 5.0% cyclopentamethoxysiloxane, 7.0% jojoba seed oil, 5.0% squalane, 3.0% meadowfoam seed oil; Phase C: 2.0% glycerin, 1.5% 1,3-butanediol, 1.0% propylene glycol, 1.2% trehalose, 0.3% sodium hyaluronate (oil-dispersed type), 0.2% tremella polysaccharide, 0.4% ceramide NP, 0.2% ceramide AP, 0.3% phytosterols; Phase D: 3.0% CI 15850 (lake red), CI... 77491 (iron oxide red) 0.5%; Phase E: tocopherol 0.2%, butylated hydroxytoluene (BHT) 0.05%; Phase F: panthenol 0.5%, bisabolol 0.2%, centella asiatica extract 0.3%; the balance is isododecane to bring the total to 100%.

[0090] The preparation method of the moisturizing lipstick in this embodiment is the same as that in Example 1, except that the F-phase functional additive is added in step (5). This embodiment further verifies the feasibility of the formulation within a wider range of components, and the results show that the formulation also has good lipstick forming properties, smooth application, moisturizing effect and stability. Example 5

[0091] A moisturizing lipstick, by weight percentage, the moisturizing lipstick of Example 5 comprises: Phase A: rice bran wax 3.0%, sunflower seed wax 3.0%, beeswax 4.0%, magnesium aluminum silicate 1.0%, montmorillonite 0.5%; Phase B: cyclopentamethoxysilane (DC 245) 18.0%, polydimethylsiloxane 7.0%, jojoba seed oil 6.0%, squalane 6.0%, olive fruit oil 3.0%; Phase C: glycerin 2.0%, diglyceride 1.0%, propylene glycol 1.0%, trehalose 1.0%, sodium hyaluronate (oil-dispersed type) 0.2%, ceramide NP 0.5%, phytosterols 0.3%; Phase D: CI 15850 (lake red) 4.0%; Phase E: tocopherol 0.2%; Phase F: vitamin E acetate 0.5%, coenzyme Q10 0.1%; the balance is isohexadecane to bring the total to 100%.

[0092] The preparation method of the moisturizing lipstick in this embodiment is the same as in Example 1. This embodiment verifies the feasibility of the formulation under different combinations of wax bases, different thickeners, and different volatile solvents. The results show that the technical solution of the present invention has good formulation compatibility and universality.

[0093] Comparative Example 1 This comparative example provides a control lipstick formula, which differs from Example 1 in that: the sugar-based moisturizers (trehalose and sodium hyaluronate) in phase C are not added; only polyol-based moisturizers and biomimetic moisturizers are retained. The remaining components and preparation methods are the same as in Example 1. Specifically, the phase C components are: glycerin 2.5g, 1,3-butanediol 1.5g, ceramide NP 0.5g, and phytosterol 0.2g.

[0094] Comparative Example 2 This comparative example provides a control lipstick formula, which differs from Example 1 in that: the biomimetic moisturizers (ceramide NP and phytosterols) in phase C are not added; only polyol moisturizers and sugar moisturizers are retained. The remaining components and preparation method are the same as in Example 1. Specifically, the phase C components are: glycerin 2.5g, 1,3-butanediol 1.5g, trehalose 1.0g, and sodium hyaluronate 0.3g.

[0095] Comparative Example 3 This comparative example provides a control lipstick formula, which differs from Example 1 in that the weight ratio of each component in phase C is different, the amount of the first moisturizer (glycerin + 1,3-butanediol) is 0.2%, the amount of the second moisturizer (trehalose + sodium hyaluronate) is 0.05%, the amount of the third moisturizer (ceramide NP + phytosterol) is 0.03%, and the remaining components and preparation methods are the same as in Example 1.

[0096] Comparative Example 4 This comparative example provides a control lipstick formula prepared according to the formula of Example 1 of Chinese Patent CN112957285A: 4g beeswax, 8g glycolipid, 1g phytosterol isostearate, 2g shea butter resin, 0.5g sodium hyaluronate, 0.3g tocopheryl acetate, and the balance being a mixture of olive fruit oil and castor oil.

[0097] Effect verification The following tests were conducted on the performance and efficacy of the lipstick samples prepared in Examples 1-3 and Comparative Examples 1-4.

[0098] I. Physical and chemical properties testing of the ointment 1. Hardness test The hardness of the paste was determined using the penetration test. Test conditions: temperature 25℃±1℃, relative humidity 50%±5%, probe mass 50g, penetration time 5 seconds. The penetration depth (mm) of the probe in the paste was recorded. Each sample was tested three times, and the average value was taken. A smaller penetration depth indicates greater hardness.

[0099] 2. Melting point determination The melting point of the paste was determined using the capillary method. The sample was placed in a capillary tube sealed at one end and placed in a melting point apparatus. The temperature was increased at a rate of 1℃ / min, and the temperature at which the paste completely melted was recorded.

[0100] 3. High-temperature stability test The lipstick samples were stored in a 45℃ constant temperature chamber for 4 weeks, and the appearance of the lipstick was observed weekly (whether softening, deformation, sweating, oil seepage, etc. occurred).

[0101] The test results are shown in Table 1.

[0102]

[0103] As can be seen from the data in Table 1, the hardness and melting point of the pastes in Examples 1-3 are all within a suitable range (penetration depth 2.5-3.0 mm, melting point 47.8℃-49.2℃), and they exhibit good high-temperature stability. Comparative Example 3, due to its low total C phase content, has a softer paste and decreased high-temperature stability. Comparative Example 4, due to a lack of thickener and an unsatisfactory wax phase ratio, has excessively low hardness and a low melting point (44.2℃), and exhibits significant softening and sweating when stored at 45℃.

[0104] II. Sensory Evaluation Test Thirty healthy female volunteers (aged 25-45) were recruited to conduct sensory evaluations of the lipstick samples from Examples 1-3 and Comparative Examples 1-4 using a double-blind method. Evaluation dimensions included: smoothness of application, lip hydration, stickiness, color saturation, and staying power (4 hours). Each indicator was scored on a 10-point scale (1 being the worst and 10 being the best), and the average score was taken.

[0105] The test results are shown in Table 2.

[0106]

[0107] *Note: The lower the stickiness score, the less sticky it is and the better the experience.

[0108] As shown in Table 2, Examples 1-3 significantly outperformed Comparative Examples 1-4 in all sensory evaluation indicators. Specifically, the lip moisturizing scores of Examples 1-3 all exceeded 9.0 points, while the moisturizing scores of Comparative Examples 1-4 were all below 8.0 points. This demonstrates that the triple moisturizing compound system of the present invention has a significant advantage in improving lip moisturizing. Comparative Example 1 lacked a saccharide moisturizer, and Comparative Example 2 lacked a biomimetic moisturizer; both showed a significant decrease in moisturizing effect and makeup retention, verifying the indispensability of saccharide and biomimetic moisturizers and their synergistic effect with polyol moisturizers. Comparative Example 3 had poor performance in all indicators due to its low total amount of moisturizer. Comparative Example 4, being a prior art formulation, performed the worst overall, especially in makeup retention (6.0 points), significantly inferior to the present invention.

[0109] III. Skin Moisture Content Test The skin moisture analyzer, Corneometer CM825 from CK (Germany), was used for testing under constant temperature and humidity conditions (temperature 22℃±1℃, relative humidity 50%±5%). Thirty healthy female volunteers (with a basic stratum corneum moisture content of 30-50 AU on their lips) were selected, and test areas were marked on both lips. The basic stratum corneum moisture content (T0) was measured before lipstick application. Lipstick samples from Examples 1-3 and Comparative Examples 1-4 were then applied (approximately 10 mg per lip). The stratum corneum moisture content was measured at 30 minutes (T1), 2 hours (T2), 4 hours (T3), and 6 hours (T4) after application. The increase in moisture content relative to the baseline value (T0) at each time point was calculated as follows: Increase rate (%) = (Tx - T0) / T0 × 100%.

[0110] The test results are shown in Table 3.

[0111]

[0112] As can be seen from the data in Table 3: Examples 1-3 all showed an increase in stratum corneum moisture content of over 80% 30 minutes after application (Example 3 reached 88.3%), and maintained an increase of no less than 50% 4 hours after application and no less than 34% 6 hours after application, demonstrating excellent immediate moisturizing effect and outstanding moisturizing long-lasting effect.

[0113] Comparative Example 1 (lacking sugar humectants) showed a 62.3% increase in moisture content 30 minutes after application, significantly lower than Example 1 (85.6%), and rapidly decreased to 28.4% after 4 hours, indicating that the lack of sugar humectants led to a significant decrease in moisturizing durability.

[0114] The moisturizing effect of Comparative Example 2 (lacking biomimetic moisturizer) was even worse than that of Comparative Example 1, with only 58.7% after 30 minutes of application and dropping to 26.8% after 4 hours. This indicates that biomimetic moisturizer plays an irreplaceable role in repairing the lip barrier and maintaining long-lasting hydration.

[0115] Comparative Example 3 (with insufficient moisturizer) had the worst moisturizing effect, with only 45.2% remaining after 30 minutes and only 18.6% remaining after 4 hours, failing to meet the moisturizing standard required by this invention.

[0116] Comparative Example 4 (existing technology) showed the worst overall moisturizing effect, with an improvement rate of only 15.2% after 4 hours of application, which is significantly different from Examples 1-3 of this invention (p<0.01). This result indicates that existing moisturizing lipsticks are difficult to achieve truly long-lasting moisturizing effects, and the lip moisture content drops back to near the baseline value after 2-3 hours of application.

[0117] The above data fully demonstrates the synergistic effect of the "polyol + sugar + biomimetic lipid" triple moisturizing compound system of the present invention. The three moisturizing mechanisms complement and promote each other, and together achieve significant moisturizing effect and excellent moisturizing long-lasting effect.

[0118] IV. Evaluation of the "Uprooting" Phenomenon The degree of "dryness" of lipsticks was evaluated using a combination of subjective evaluation and objective instrument testing.

[0119] Subjective evaluation: Thirty volunteers were asked to rate their lip dryness at 1, 2, 3, and 4 hours after applying lipstick, using a 5-point rating system: 1 point for no dryness (lips felt moisturized), 2 point for slight dryness (negligible), 3 point for moderate dryness (perceptible but not affecting comfort), 4 point for noticeable dryness (tightness and discomfort), and 5 point for severe dryness (peeling and flaking). Lower scores indicated less dryness.

[0120] Objective test: Four hours after lipstick application, the transepidermal water loss (TEWL) value of the lips was measured using the Tewameter TM300 transepidermal water loss tester. The lower the TEWL value, the better the skin barrier function, the less water loss, and the milder the "dryness".

[0121] The test results are shown in Table 4.

[0122]

[0123] As shown in Table 4, the subjective scores of Examples 1-3 remained between 1.0 and 1.5 1-4 hours after application, and at 4 hours, the dryness sensation ranged from slight to no dryness. Furthermore, the TEWL values ​​were all below 9.0 g / h·m², indicating good lip skin barrier function and almost no "drying" phenomenon. In contrast, Comparative Examples 1-4 showed obvious moderate to obvious dryness starting 2 hours after application, with subjective scores reaching 3.2-4.2 points at 4 hours and TEWL values ​​as high as 12.6-15.8 g / h·m², indicating damaged lip skin barrier, significant moisture loss, and a typical "drying" phenomenon.

[0124] This result further confirms that the present invention, through a dual-oil-phase design of "volatile silicone oil + non-volatile plant oil" and a triple moisturizing compound system of "polyol + sugar + biomimetic lipids", can fundamentally prevent the occurrence of "dryness".

[0125] V. Stability Testing In accordance with the requirements for cosmetic stability testing in the "Cosmetic Safety Technical Specifications" (2015 edition), accelerated stability tests and long-term stability tests were conducted on Examples 1-3 and Comparative Examples 1-4.

[0126] Accelerated stability test conditions: temperature 40℃±2℃, relative humidity 75%±5%, storage period 12 weeks (84 days). Samples were taken at weeks 0, 4, 8, and 12 during the storage period to observe changes in the appearance (color, odor, and form) of the cream, and the increase rate of stratum corneum moisture content of each sample was measured 4 hours after application.

[0127] Long-term stability test conditions: temperature 25℃±2℃, relative humidity 60%±5%, storage period 12 months. Samples were taken at months 0, 3, 6, 9, and 12 during the storage period to observe changes in the appearance of the paste.

[0128] The test results are shown in Table 5.

[0129]

[0130] *Note: Moisturizing rate refers to the increase in the moisture content of the stratum corneum 4 hours after application compared to before application.

[0131] As shown in Table 5, after 12 weeks of storage at 40℃ / 75%RH, Examples 1-3 showed no significant changes in appearance, and the reduction in moisturizing efficacy was minimal (the decrease in moisturizing rate did not exceed 5 percentage points), demonstrating excellent stability. In contrast, Comparative Examples 1-4 exhibited varying degrees of discoloration, softening, oil seepage, and even off-odors under accelerated conditions, with a significant reduction in moisturizing efficacy. This result indicates that the formulation system of this invention possesses good thermal and chemical stability.

[0132] VI. Synergistic Effect Verification Experiment of Triple Moisturizing Compound System To further verify the synergistic effect of the "polyol + sugar + biomimetic lipid" triple moisturizing compound system of the present invention, the inventors conducted systematic single-factor loss experiments and orthogonal optimization experiments.

[0133] 1. Single-factor missing data experiment The following experimental groups were designed: (1) Full formulation group (Example 1); (2) Group lacking the first moisturizer (i.e., no glycerin and 1,3-butanediol added, the rest is the same as in Example 1); (3) Group lacking the second moisturizer (i.e., no trehalose and sodium hyaluronate added, the rest is the same as in Example 1); (4) Group lacking the third moisturizer (i.e., no ceramide NP and phytosterol added, the rest is the same as in Example 1); (5) Group with only oil base (i.e., no C-phase moisturizing ingredients added, the rest is the same as in Example 1). Samples of each group were prepared according to the preparation method of Example 1, and the increase rate of stratum corneum moisture content at each time point after application was measured according to the aforementioned skin moisture content test method. The results are shown in Table 6 below:

[0134] The data above shows that the moisturizing effect of the full-formula group was significantly better than any experimental group lacking one moisturizer at any time point. Particularly noteworthy is that, after omitting any moisturizer, the moisture content increase rate 4 hours after application decreased from 52.8% to approximately 30%, a drop of over 40%; and 6 hours after application, the moisture content increase rate decreased from 36.5% to approximately 20%, a drop of approximately 45%. A mathematical decomposition of the contributions of each moisturizer reveals the following: the individual contribution of the first moisturizer is approximately 14.2% (52.8% for the full formula minus 28.9% for the group lacking the first moisturizer, approximately 23.9%, but considering the interaction effect, the actual contribution needs further decomposition); the individual contribution of the second moisturizer is approximately 22.6%; and the individual contribution of the third moisturizer is approximately 20.3%. The sum of their individual contributions is 57.1%, far exceeding the measured value of 52.8% for the full-formula group. However, considering only the additive contribution, the decrease in moisturizing effect when the first, second, and third moisturizers are missing is 23.9%, 22.6%, and 20.3%, respectively, with a simple sum of 66.8%. The actual effect of the complete formula is 34.3% higher than the formula retaining only the oil base. This data indicates a complex interaction between the three moisturizers, with a synergistic effect: when all three coexist, not only is a complete moisturizing chain of "water absorption-water retention-water locking" achieved, but also a 1+1+1>3 effect is produced in terms of cream stability and moisture retention duration.

[0135] 2. Orthogonal optimization experiment of humectant ratio The inventors further conducted a three-factor, three-level orthogonal optimization experiment (L9(3³) orthogonal array) using the dosage of the first moisturizer (glycerin + 1,3-butanediol) (A), the dosage of the second moisturizer (trehalose + sodium hyaluronate) (B), and the dosage of the third moisturizer (ceramide NP + phytosterol) (C) as factors, with the increase in stratum corneum moisture content 4 hours after application as the indicator. The results are shown in Table 7 below:

[0136] The orthogonal experimental results show that when A = 4%-5%, B = 1.3%-1.5%, and C = 0.7%-0.8% (i.e., the weight ratio of the three moisturizers is approximately (4-5):(1.3-1.5):(0.7-0.8), which is approximately (6-7):2:1), the moisturizing rate reaches its optimal value 4 hours after application. This indicates that there is an optimal ratio range among the three moisturizers, and exceeding this range will lead to a weakening of the synergistic effect.

[0137] VII. Evaluation of the effect of repairing the skin barrier function of the lips In addition to testing the stratum corneum moisture content using a Corneometer, the inventors also used a Tewameter TM300 transepidermal water loss analyzer to measure the change in transepidermal water loss (TEWL) values ​​before and after applying lipstick to evaluate the product's repair effect on the lip skin barrier function. A lower TEWL value indicates better skin barrier function and less moisture loss. Test conditions: constant temperature and humidity (temperature 22℃±1℃, relative humidity 50%±5%), 30 subjects. Baseline TEWL values ​​were measured before applying lipstick, and TEWL values ​​were measured again 4 hours after application. The results are shown in Table 8 below:

[0138] The above data shows that the TEWL value of the moisturizing lipstick of the present invention (Examples 1-3) decreased significantly after 4 hours of application, with a reduction of more than 35%, indicating that the lip skin barrier function was effectively repaired and strengthened. In contrast, the TEWL values ​​of existing technology products (Comparative Examples 1-4) remained basically unchanged or even increased significantly after 4 hours of application (Comparative Example 3 increased by 14.2%, Comparative Example 4 increased by 19.7%), indicating that the lip skin barrier function was not only not repaired, but was further damaged by the application of lipstick, and moisture loss was aggravated. This result fully demonstrates the unique contribution of the third moisturizer (biomimetic moisturizer) in the present invention in repairing the lip skin barrier, and the key role played by the triple moisturizing compound system in the "water-locking" process.

[0139] VIII. Evaluation of the effect of improving lip lines High-resolution images of the subjects' lips were taken using the Visia-CR facial imaging system, and lip wrinkle parameters were quantitatively analyzed using Image-ProPlus image analysis software. Evaluation indicators included the number of lip wrinkles, lip wrinkle depth, and lip wrinkle area. Test conditions: constant temperature and humidity (temperature 22℃±1℃, relative humidity 50%±5%), 30 subjects, continuous product use for 14 days (once in the morning and once in the evening), lip imaging and analysis were performed at D0 (before use), D7 (7 days after use), and D14 (14 days after use). Results are shown in Table 9 below:

[0140] The above data shows that after 14 days of continuous use, the moisturizing lipstick of this invention significantly improves the number, depth, and area of ​​lip lines (reduction rates all exceeding 25%, reaching a maximum of 38.4%), while the improvement effect of existing technology products is limited (reduction rates are all below 15%). This difference in effect is attributed to the synergistic effect of the triple moisturizing compound system of this invention: polyol moisturizers provide immediate hydration to the lips, making the stratum corneum plump and temporarily smoothing superficial lip lines; sugar moisturizers form a water-retaining film on the lip surface, continuously maintaining the moisture of the stratum corneum; and biomimetic moisturizers structurally repair the damaged lipid bilayer of the stratum corneum, restoring the skin barrier function and fundamentally improving the microstructure of the lip skin, resulting in a sustained improvement in deep lip lines. The synergistic effect of these three components achieves lip line improvement from immediate smoothing to long-term repair.

[0141] IX. Evaluation of Moisturizing Effect under Different Environmental Humidity Conditions To verify the adaptability of the moisturizing lipstick of the present invention under different environmental conditions, the inventors tested the stratum corneum moisture content enhancement rate (4 hours after application) of Examples 1 and Comparative Example 4 under low humidity (30%±5%), medium humidity (50%±5%), and high humidity (70%±5%) conditions. The results are shown in Table 10 below:

[0142] The above data shows that the moisturizing lipstick of the present invention maintains excellent moisturizing effects under different environmental humidity conditions. Even under low humidity (30% RH) conditions, the increase rate of stratum corneum moisture content after 4 hours of application can still reach 48.6%, only about 6.6 percentage points lower than under high humidity conditions. This is due to the complementary effects of the components in the triple moisturizing compound system of the present invention: under low humidity conditions, the ability of polyol moisturizers to absorb moisture from the environment is limited, but the water-retaining film effect of sugar moisturizers and the barrier repair effect of biomimetic moisturizers are basically unaffected by environmental humidity, and can still effectively reduce the passive evaporation of lip moisture, thereby maintaining a high stratum corneum moisture content. In contrast, the moisturizing effect of the prior art product (comparative example 4) is greatly affected by environmental humidity. Under low humidity conditions, the increase rate of moisture content after 4 hours of application is only 8.5%, almost losing its moisturizing effect. This result shows that the moisturizing lipstick of the present invention has excellent environmental adaptability and can meet the usage needs of consumers under different climatic conditions.

[0143] 10. Safety Evaluation In accordance with the relevant requirements of the "Cosmetic Safety Technical Specifications" (2015 edition), occlusive patch tests were conducted on Examples 1-3. Thirty subjects participated. The sample was placed in a patch applicator and applied to the back of each subject. After 24 hours, the patch applicator was removed, and skin reactions were observed at 0.5 hours, 24 hours, and 48 hours after removal. Results showed that no adverse skin reactions such as erythema or edema occurred in any of the subjects at any of the observation time points, and the skin reaction grade was 0 (negative). This indicates that the moisturizing lipstick of the present invention has good skin safety and is suitable for use by a wide range of people, including those with sensitive skin.

[0144] XI. Microbial Testing In accordance with the requirements of the "Cosmetic Safety Technical Specifications" (2015 edition), microbiological indicators were tested for Examples 1-3. The test items included: total bacterial count, total mold and yeast count, thermotolerant coliforms, Staphylococcus aureus, and Pseudomonas aeruginosa. The test results are shown in Table 11 below:

[0145] The above test results show that all microbial indicators of the moisturizing lipstick of this invention meet the requirements of the "Cosmetic Safety Technical Specifications". The anhydrous formula design of this invention (water content less than 0.5%) greatly reduces the risk of microbial growth, and meets the microbial indicator requirements without the need for additional preservatives, further improving the safety of the product.

[0146] 12. User Satisfaction Survey A large-scale user satisfaction survey was conducted on Examples 1-3 and Comparative Examples 1-4. Two hundred participants (female, aged 20-50 years) used the product continuously for 14 days (twice daily) and completed a satisfaction questionnaire afterward. The questionnaire included satisfaction with the product texture, smoothness of application, moisturizing effect, makeup lasting effect, non-transfer effect, scent, packaging design, and overall satisfaction. Each satisfaction rating was based on a 5-point scale (1 point for very dissatisfied, 5 points for very satisfied). The results are shown in Table 12 below.

[0147] The survey results above show that the moisturizing lipstick of this invention significantly outperforms existing products in all satisfaction indicators, achieving a comprehensive satisfaction score of 4.72-4.76 out of 5, while existing products only score 3.18-3.75. This result fully demonstrates that the product of this invention can meet consumers' comprehensive needs for moisturizing, makeup effect, and skin feel in actual use, and has a promising market prospect.

[0148] The technical advantages of this invention can be theoretically explained from the following perspectives: This invention combines polyol moisturizers, sugar moisturizers, and biomimetic moisturizers to achieve synergistic effects of three different moisturizing mechanisms.

[0149] Polyol moisturizers (glycerin, butylene glycol, etc.) have strong hygroscopic properties, enabling them to actively absorb moisture from the environment and retain it on the surface of the stratum corneum, providing immediate hydration to the lips. However, the water-retention capacity of polyols is greatly affected by environmental humidity; their moisturizing effect decreases significantly in low-humidity environments.

[0150] Sugar-based moisturizers (such as trehalose, hyaluronic acid, and tremella polysaccharide) possess unique water-retention mechanisms. Trehalose can form a protective film on the skin surface, preventing moisture evaporation and stabilizing protein structures. Hyaluronic acid has extremely strong hydration capabilities, forming a three-dimensional network structure in the stratum corneum to bind and store large amounts of water. The water-retention capacity of sugar-based moisturizers is less affected by environmental humidity, maintaining a stable water-retention effect even in low to medium humidity environments.

[0151] The mechanism of action of biomimetic moisturizers (ceramides, phytosterols, etc.) is completely different from the former two. Ceramides are the main component of intercellular lipids in the stratum corneum. Supplementing with exogenous ceramides can repair the damaged lipid structure of the stratum corneum and restore the skin barrier function. After the skin barrier is repaired, it can effectively prevent the passive evaporation of moisture in the stratum corneum and enhance the skin's tolerance to external stimuli.

[0152] When the three moisturizers mentioned above coexist in the same formulation, they act on different stages of the moisturizing process: polyols are responsible for active water absorption, sugars for water retention and film formation, and biomimetic lipids for barrier repair. Together, they form a complete moisturizing chain of "water absorption-water retention-water locking," with a combined effect far exceeding the simple sum of the effects of each component. This synergistic mechanism provides a solid theoretical foundation for the inventiveness of this invention.

[0153] This invention preferably employs an anhydrous formulation (water content less than 0.5%). This design brings several technical advantages: First, it avoids phase separation problems caused by the incompatibility between water and oil-based matrices, improving the uniformity and stability of the paste; second, it avoids the evaporation of water during high-temperature filling, ensuring the perfect appearance of the paste; third, it reduces the risk of microbial growth, reducing the amount of preservatives used or even eliminating the need for preservatives; fourth, it reduces the potential irritation risk of preservatives to the lip skin, improving product safety. In existing technologies, most moisturizing lipsticks have to introduce an aqueous phase to add water-soluble moisturizing ingredients, which in turn requires the addition of emulsifiers and preservatives, increasing the complexity of the formulation system and potential safety risks to some extent. This invention, by using oil-dispersible sodium hyaluronate and other raw materials and a specific preparation process, successfully achieves stable dispersion of multiple moisturizing factors under anhydrous conditions, which is a significant technical breakthrough of this invention.

[0154] The main reason for the "drying" phenomenon in traditional lipsticks is that the evaporation of volatile solvents takes away heat and moisture, while there is a lack of continuous moisture replenishment afterward. This invention fundamentally solves the "drying" problem through the following mechanism: First, this invention employs a two-phase design of volatile silicone oil and non-volatile plant oils. The volatile silicone oil evaporates in the initial stage of application, providing a refreshing application experience; while the non-volatile plant oils remain on the lips, providing continuous moisturizing protection.

[0155] Secondly, after the volatile solvents evaporate, the triple moisturizing complex system continuously replenishes and retains moisture in the stratum corneum with polyol and sugar moisturizers, while biomimetic moisturizers repair the skin barrier and reduce moisture loss.

[0156] Third, after the volatile solvents of the moisturizing lipstick of the present invention have completely evaporated, what remains on the surface of the lips is not a simple oil film, but a composite protective layer composed of plant oils, moisturizing factors, and waxes. This protective layer has good moisture permeability and breathability, which can effectively prevent excessive moisture evaporation without causing a stuffy feeling due to excessive occlusion.

[0157] Compared with the prior art, the present invention has the following beneficial technical effects: Synergistic Effect of Moisturizing: This invention achieves a complete moisturizing chain of "water absorption-water retention-water locking" by compounding polyol moisturizers, sugar moisturizers, and biomimetic moisturizers in a specific ratio. Polyol moisturizers actively absorb moisture from the environment ("water absorption"), sugar moisturizers form a water-retaining film on the lip surface to reduce moisture evaporation ("water retention"), and biomimetic moisturizers structurally repair the damaged skin barrier ("water locking"). These three moisturizing mechanisms complement and promote each other, producing a significant synergistic effect. Experimental data shows that the increase in stratum corneum moisture content 4 hours after application of the full-formula group (52.8%) is far greater than the sum of the oil-based group (18.5%) and the individual contributions of each moisturizer (approximately 30%), demonstrating a synergistic effect of 1+1+1>3. This synergistic mechanism is one of the core innovations that distinguishes this invention from existing technologies.

[0158] Significantly improved moisturizing longevity: The product of this invention increases the stratum corneum moisture content by no less than 80% after 30 minutes of application, no less than 40% after 4 hours, and no less than 34% after 6 hours, demonstrating significantly superior moisturizing longevity compared to existing products. In contrast, the existing product (Comparative Example 4) only increased the moisture content by 42.6% after 30 minutes, decreasing to 15.2% after 4 hours and 8.5% after 6 hours, exhibiting rapid decline in moisturizing effect. This invention, through the organic combination of a two-phase oil system (volatile silicone oil + non-volatile plant oils) and a triple moisturizing complex system, achieves a complete moisturizing process from initial rapid hydration to long-term continuous moisture retention, fundamentally solving the technical problem of insufficient moisturizing longevity in traditional lipsticks.

[0159] The fundamental solution to the "drying" problem: Four hours after application, the subjective dryness score of this invention is only 1.3-1.5 points (1 point for no dryness), while existing products under the same conditions score 3.2-4.2 points (3 points for moderate dryness, 4 points for significant dryness). This invention, through a rational ratio of volatile silicone oil and non-volatile plant oils, and the continuous moisture replenishment and barrier repair effect of a triple moisturizing complex system, fundamentally avoids the dryness problem caused by solvent evaporation after traditional lipstick application. Transepidermal water loss (TEWL) testing further confirms that the TEWL value of this invention decreases by more than 35% after 4 hours, effectively repairing the lip skin barrier function, while the TEWL value of existing products increases instead of decreasing, exacerbating lip moisture loss.

[0160] Repairing effect on the lip skin barrier: After application of this invention, the TEWL value decreased by more than 35% within 4 hours. After 14 days of continuous use, the number of lip lines decreased by 30%-35%, the depth of lip lines decreased by 25%-30%, and the area of ​​lip lines decreased by 33%-38%. This effect is mainly attributed to the third moisturizer in this invention (a biomimetic moisturizer, including ceramides and phytosterols). Ceramides are the main component of intercellular lipids in the stratum corneum. Supplementing with exogenous ceramides can repair the damaged lipid structure of the stratum corneum and restore the skin barrier function. Phytosterols are chemically similar to cholesterol and can replace cholesterol components in the stratum corneum, participating in the construction of an ordered lipid bilayer structure. The two work synergistically to improve the condition of the lip skin from a microstructural perspective.

[0161] The stability advantages of the anhydrous formulation: This invention employs an anhydrous formulation design (water content less than 0.5%), effectively avoiding the incompatibility issues between the aqueous and oil phases, and improving the uniformity and stability of the cream. Accelerated stability testing verified that after 12 weeks of storage at 40℃ / 75%RH, the appearance of the cream showed no significant change, and the moisturizing efficacy decreased by no more than 5 percentage points. In contrast, existing products exhibit varying degrees of discoloration, softening, oil seepage, and even off-odors under the same conditions, resulting in a significant reduction in moisturizing efficacy. The anhydrous formulation design of this invention also reduces the risk of microbial growth, meeting microbiological requirements without the need for preservatives, further improving product safety.

[0162] Synergistic Enhancement of Makeup Efficacy: This invention achieves long-lasting hydration and barrier repair while maintaining excellent makeup efficacy. The smoothness of application scores 9.0-9.3 out of 10, color saturation 9.0-9.3, and staying power 8.6-8.9, all significantly superior to existing technologies. This invention, through a rational ratio of volatile silicone oil and non-volatile plant oils, and an optimized combination of wax-based matrices, ensures moisturizing effects while giving the cream excellent formability, spreadability, and color performance.

[0163] Adaptability to different environmental conditions: The moisturizing lipstick of this invention maintains excellent moisturizing effects under different environmental humidity conditions. Even under low humidity (30% RH) conditions, the stratum corneum moisture content still increases by 48.6% after 4 hours of application, while existing products only increase by 8.5% under the same conditions. This environmental adaptability advantage is due to the complementary effects of the components in the triple moisturizing compound system of this invention, which can meet the usage needs of consumers under different climatic conditions.

[0164] Excellent safety and user satisfaction: Skin patch testing has verified that the product of this invention has excellent skin safety and is suitable for a wide range of people, including those with sensitive skin. Large-scale user satisfaction surveys show that the overall satisfaction score of the product of this invention is as high as 4.72-4.76 points (out of 5), significantly better than existing technology products (3.18-3.75 points), indicating that the product of this invention can meet the comprehensive needs of consumers in actual use and has good market prospects.

[0165] The moisturizing lipstick and its preparation method provided by this invention have the following industrial application prospects: First, this invention successfully solves the technical problem of stable dispersion of highly effective moisturizing ingredients in oily lipstick systems through specific formula design and preparation process. The product has good stability and consistency and is suitable for large-scale industrial production.

[0166] Secondly, the preparation method of the present invention does not involve complex equipment and harsh process conditions, has good compatibility with existing lipstick production lines, can be produced based on existing production facilities and processes, has low investment costs, and is easy to promote.

[0167] Third, the product of this invention is significantly superior to existing products in terms of moisturizing effect, which can meet consumers' demand for "makeup and skincare in one" and has broad market prospects and commercial value.

[0168] Fourth, the core technology of this invention: the triple moisturizing compound system, can not only be used in lipstick products, but can also be extended to other lip care products and makeup products such as lipsticks, lip glosses, and lip balms, and has significant technological extension value.

[0169] Through a detailed comparison of the above embodiments and comparative examples, the following conclusions can be drawn: (1) The moisturizing lipstick of the present invention exhibits excellent performance in terms of physicochemical properties of the paste, sensory evaluation, moisturizing effect, anti-drying performance and stability, which is significantly better than the prior art represented by Comparative Examples 1-4.

[0170] (2) The triple moisturizing compound system (polyols + sugars + biomimetic lipids) of the present invention produced a significant synergistic effect. The three moisturizing mechanisms complemented and promoted each other, and together achieved excellent moisturizing effect and long-lasting moisturizing effect.

[0171] (3) The dual-oil phase design of the present invention (volatile silicone oil + non-volatile plant oil) takes into account both the refreshing feeling when applying and the long-lasting moisturizing effect after application, effectively avoiding the problem of "drying".

[0172] (4) The anhydrous formulation design and specific preparation process of the present invention ensure the stable dispersion of various moisturizing factors in the oily matrix, thus ensuring the long-term storage stability of the product.

[0173] In summary, this invention provides a complete and effective moisturizing lipstick and its preparation method, solving key technical problems that have long existed in existing technologies, such as insufficient moisturizing duration, significant dryness, and poor compatibility of moisturizing ingredients. By constructing a two-phase system of "volatile silicone oil + non-volatile plant oil" and a triple moisturizing compound system of "polyol hygroscopic moisturizer + sugar-based biological moisturizer + biomimetic lipid barrier repair agent," multi-level and multi-mechanism synergistic moisturizing is achieved. Experimental data show that the moisturizing lipstick of this invention increases the stratum corneum moisture content by no less than 40% after 4 hours of application, no less than 34% after 6 hours, reduces the TEWL value by more than 35% after 4 hours, and achieves a subjective dryness score of less than 1.5 after 4 hours. The stability of the lipstick and its makeup effect are significantly better than existing products.

[0174] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A moisturizing lipstick, characterized in that, By weight percentage, it includes the following components: Phase A: 5%-15% wax base, 0.5%-3% thickener; Phase B: First grease 15%-30%, Second grease 10%-20%; Phase C: First moisturizer 0.5%-5%, Second moisturizer 0.2%-2%, Third moisturizer 0.1%-1.5%; Phase D: Colorant 0.5%-8%; Phase E: Antioxidant 0.05%-0.5%; The remainder is a volatile solvent; The first oil is a volatile silicone oil, selected from one or more of cyclopentamethoxysiloxane, cyclopolydimethylsiloxane, and polydimethylsiloxane; the second oil is a non-volatile vegetable oil, selected from one or more of jojoba seed oil, meadowfoam seed oil, squalane, shea butter, and olive oil; the first moisturizer is a polyol moisturizer, selected from one or more of glycerin, 1,3-butanediol, propylene glycol, and diglyceride; the second moisturizer is a sugar moisturizer, selected from one or more of trehalose, sodium hyaluronate, and tremella polysaccharide; and the third moisturizer is a biomimetic moisturizer, selected from one or more of ceramide NP, ceramide AP, and phytosterols.

2. The moisturizing lipstick according to claim 1, characterized in that, In phase A, the wax matrix is ​​selected from one or more of candelilla wax, carnauba wax, beeswax, rice bran wax, and sunflower seed wax; the thickener is selected from one or more of distearate, lithium dimethylammonium montmorillonite, magnesium aluminum silicate, and montmorillonite.

3. The moisturizing lipstick according to claim 1, characterized in that, By weight percentage, it also includes phase F: 0.1%-3% of functional additives, said functional additives being selected from one or more of vitamin E acetate, magnesium vitamin C phosphate, coenzyme Q10, panthenol, bisabolol, centella asiatica extract, and purslane extract.

4. A moisturizing lipstick according to claim 1, characterized in that, The volatile solvent is one or more of isododecane, isohexadecane, isononyl isononanoate, and octyldodecyl alcohol, and its amount is 20%-50%.

5. A moisturizing lipstick according to claim 1, characterized in that, The weight ratio of the first moisturizer, the second moisturizer, and the third moisturizer is (3-8):(1-3):(0.5-2).

6. A moisturizing lipstick according to claim 1, characterized in that, The moisturizing lipstick has an anhydrous formula, with a water content of less than 0.5% by weight.

7. A moisturizing lipstick according to claim 1, characterized in that, The moisturizing lipstick is a solid stick-shaped paste with a hardness of 50-120g and a melting point of not less than 45℃.

8. A moisturizing lipstick according to claim 1, characterized in that, After the moisturizing lipstick is applied to the lips, the moisture content of the stratum corneum of the lip skin increases by no less than 80% 30 minutes after application compared to before application, and by no less than 40% 4 hours after application compared to before application.

9. A method for preparing a moisturizing lipstick according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Add phase A to the first reaction vessel, heat to 85℃-95℃, and stir until completely melted to obtain the molten wax phase; Step 2: Add the second oil from phase B to the second reaction vessel, heat to 75℃-85℃, then add the first oil from phase B, stir evenly to obtain an oil phase mixture; Step 3: After premixing the first and second humectants in phase C evenly, add them to the oil phase mixture obtained in step 2 under stirring conditions, then add the third humectant and continue stirring until completely dispersed and evenly dispersed to obtain the moisturizing oil phase; Step 4: Add the D phase colorant to the moisturizing oil phase obtained in Step 3, and grind it with a three-roll mill until the particle size is uniform to obtain the colored oil phase; Step 5: Mix the molten wax phase obtained in Step 1 with the coloring oil phase obtained in Step 4 at 75℃-85℃, add the E phase antioxidant and optional F phase functional additives, stir evenly, degas, and obtain the lipstick mixture. Step 6: Pour the lipstick mixture obtained in Step 5 into the mold at 70℃-80℃, cool and solidify, and then demold to obtain the moisturizing lipstick.

10. A method for preparing a moisturizing lipstick according to claim 9, characterized in that, In step three, the third moisturizer is dissolved or dispersed in a small amount of the second oil at 40°C-50°C before being added.

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