Concealer and skin-attaching foundation make-up rod and preparation process

Abstract

The invention provides a concealing and skin-attaching foundation make-up rod and a preparation process, and belongs to the technical field of cosmetics. The foundation make-up stick is prepared by compounding kaolin, silicon dioxide, synthetic fluorophlogopite, silicone oil, wax, a skin conditioner, a coloring agent, a humectant and other components according to a specific proportion, the concealing power is enhanced through powder compounding, and the skin feeling and stability are adjusted through grease and wax; the triethoxyoctyl silane and the C30-45 alkyl cetearyl polydimethylsiloxane cross-linked polymer synergistically improve the film-forming property and the makeup keeping ability, and meanwhile, the skin conditioner and the humectant are added, so that the skin nourishing effect is achieved. Experimental results show that the foundation make-up rod is good in stability under high and low temperature tests, has excellent concealing, skin attaching and make-up holding performance through skin safety tests, can achieve the effects of one rod in place and instant melting skin attaching, and is suitable for being used as professional make-up or daily make-up product development.

Description

Technical Field

[0001] This invention relates to the field of cosmetics technology, specifically to a concealing and skin-adhering foundation stick and its preparation process. Background Technology

[0002] In the modern beauty industry, foundation products, as the foundation for achieving a flawless makeup look, have always held a crucial position. Foundation sticks, as an important member of the foundation product family, have emerged in the market thanks to their unique advantages. They often employ low-water formulas with a high powder content, rich in low-viscosity oils, esters, and solid waxes, offering high coverage, long-lasting wear, and portability, making them a powerful tool for many consumers to create a refined makeup look. However, current foundation sticks on the market still have some problems that urgently need to be addressed. On the one hand, regarding coverage, although most foundation sticks claim to have concealing properties, they often fail to provide satisfactory coverage for stubborn skin imperfections such as dark acne scars, severe dark circles, and noticeable blemishes, thus failing to meet the needs of consumers who require high levels of coverage. On the other hand, their adherence to the skin also needs improvement. Some foundation sticks are prone to creasing and fading after application, especially after the skin becomes oily or sweaty, significantly reducing the makeup's effectiveness and making it difficult to maintain a long-lasting, seamless fit, thus affecting the overall aesthetics and durability of the makeup. As consumers continue to demand higher quality and better results from beauty products, developing a foundation stick with excellent coverage, superior skin adhesion, and a simple and efficient manufacturing process has become an urgent need for the industry. Summary of the Invention

[0003] The purpose of this invention is to provide a concealing and skin-adhering foundation stick and its preparation process. The foundation stick provided by this invention has the effects of concealing blemishes, adhering to the skin, long-lasting makeup, and easy application.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a concealing and skin-adhering foundation stick, comprising the following components in parts by weight: 15-20 parts kaolin, 5-10 parts silica, 1-3 parts synthetic fluorophlogopite, 6-12 parts polydimethylsiloxane, 4-8 parts hydrogenated polyisobutylene, 3-6 parts isononyl isononanoate, 2-5 parts squalane, 6-8 parts candelilla wax, 3-5 parts microcrystalline wax, 1-2 parts polyglycerol-10 myristate, 1-2 parts triethoxyoctylsilane, 1-2 parts C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, 2-5 parts skin conditioning agent, 8-12 parts colorant, 5-8 parts moisturizer, 0.1-0.4 parts preservative, and 5-10 parts water.

[0005] Preferably, the skin conditioning agent is at least one of palmitoyl tripeptide-1, white willow bark extract, chamomile extract, centella asiatica extract, and echinacea extract.

[0006] Preferably, the colorant is at least one selected from titanium dioxide, iron oxide yellow, iron oxide red, and iron oxide black.

[0007] Preferably, the moisturizer is at least one selected from hydrolyzed sodium hyaluronate, glycerin, 1,2-butanediol, and panthenol.

[0008] Preferably, the preservative is at least one selected from phenoxyethanol, 1,2-pentanediol, and octyl glycol.

[0009] This invention also provides a method for preparing the aforementioned concealer / adhesive foundation stick, comprising: heating and stirring polydimethylsiloxane, hydrogenated polyisobutylene, isononyl isononanoate, squalane, candelilla wax, and microcrystalline wax to obtain an oil phase; mixing kaolin, silica, synthetic fluorophlogopite, and a colorant, and grinding them to obtain a powder phase; mixing a moisturizer with water to obtain an aqueous phase; mixing the powder phase, aqueous phase, and oil phase, and homogenizing them to obtain a mixture; mixing the mixture with polyglycerol-10 myristate, triethoxyoctylsilane, C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, a skin conditioning agent, and a preservative, and then molding and cooling to obtain the aforementioned concealer / adhesive foundation stick.

[0010] Preferably, the heating and stirring temperature is 80-85℃, the rotation speed is 200-300rpm, and the time is 20-30min.

[0011] Preferably, the vibration frequency of the grinding process is 15-35Hz, the amplitude is 4-7mm, and the time is 15-20min.

[0012] Preferably, the homogenization pressure is 20-25 MPa and the time is 10-15 min.

[0013] Preferably, the mixing speed is 200-300 rpm and the time is 30-40 min.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a blend of kaolin, silica, and synthetic fluorophlogopite to enhance coverage while maintaining a natural makeup look. The combination of triethoxyoctylsilane and C30-45 alkyl cetearyl polydimethylsiloxane crosspolymers enhances film-forming properties and staying power, improves the stability of the foundation stick, increases smoothness and spreadability, improves waterproof and oil-resistant performance, reduces stickiness, and enhances the matte finish. Polydimethylsiloxane imparts a lightweight and smooth spreadability to the product, allowing it to adhere closely to the skin and prevent creasing or settling. Microcrystalline wax and candelilla wax ensure the foundation stick has appropriate hardness, preventing cracking at high temperatures and deterioration at low temperatures. This foundation stick solves the problems of traditional products, such as difficulty in balancing coverage and lightweight feel, insufficient staying power, and dryness. It achieves a balance between coverage, skin adherence, staying power, and spreadability, enabling a one-stick application and instant skin-blend effect, making it suitable for development as a professional makeup or everyday base makeup product. Attached Figure Description

[0015] Figure 1 The images show the effects of using the product in Example 1 before and after. Detailed Implementation

[0016] This invention provides a concealing and skin-adhering foundation stick, comprising the following components in parts by weight: 15-20 parts kaolin, 5-10 parts silica, 1-3 parts synthetic fluorophlogopite, 6-12 parts polydimethylsiloxane, 4-8 parts hydrogenated polyisobutylene, 3-6 parts isononyl isononanoate, 2-5 parts squalane, 6-8 parts candelilla wax, 3-5 parts microcrystalline wax, 1-2 parts polyglycerol-10 myristate, 1-2 parts triethoxyoctylsilane, 1-2 parts C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, 2-5 parts skin conditioning agent, 8-12 parts colorant, 5-8 parts moisturizer, 0.1-0.4 parts preservative, and 5-10 parts water.

[0017] The foundation stick of this invention comprises kaolin, silica, synthetic fluorophlogopite, and colorants. Kaolin, a natural mineral powder, has strong oil-absorbing properties, effectively absorbing skin oil and reducing shine while providing basic coverage, making it suitable for concealing pores and blemishes. Silica, a porous powder with fine particles, has a strong ability to fill pores, enhancing the smoothness of the powder and improving application. It also achieves a soft-focus, blurring effect through light scattering, softening skin texture. Synthetic fluorophlogopite has a refractive index close to that of skin, improving powder spreadability and adhesion, while also giving the product a subtle sheen, preventing a dry or cakey finish. This combination of three powders balances coverage, skin feel, and adherence, evenly covering blemishes, acne scars, and other imperfections while delivering a natural, translucent finish. The colorants are stably dispersed through powder adsorption and oil encapsulation, ensuring rich, full color to meet high-coverage needs.

[0018] This invention employs a combination of volatile silicone oil and non-volatile oils: polydimethylsiloxane is a low-viscosity volatile silicone oil that improves the spreadability of the foundation stick, forms a thin and breathable silicone film, reduces greasiness, and leaves behind powder and wax-based structures after evaporation, enhancing makeup longevity; hydrogenated polyisobutylene and isononyl isononanoate have a refreshing and non-sticky feel, good permeability, can soften the stratum corneum, promote the adhesion of powder to the skin, and reduce caking; at the same time, they act as solvents to dissolve waxes and active ingredients, improving system compatibility; squalane (2-5 parts): similar to the structure of human sebum, has excellent skin affinity, strong moisturizing power, can improve dry skin, enhance the moisturizing feel of the foundation stick, and is especially suitable for dry and normal skin types, avoiding makeup smudging caused by dryness.

[0019] This invention employs a multi-component wax blend: combining plant-based candelilla wax and mineral microcrystalline wax to provide a rigid structure, ensuring stable molding of the foundation stick and preventing breakage. Simultaneously, it regulates the melting point, allowing the product to soften appropriately at body temperature. The balanced ratio of waxes and oils ensures a solid form (suitable for stick formulations) while avoiding excessive wax content that would result in a hard texture and difficulty in spreading.

[0020] The emulsifier of this invention is a cross-linked polymer of polyglycerol-10 myristate, triethoxyoctylsilane, and C30-45 alkyl cetearyl polydimethylsiloxane, which can enhance the compatibility of the aqueous and oil phases and improve stability. The triethoxyoctylsilane and C30-45 alkyl cetearyl polydimethylsiloxane cross-linked polymer have a synergistic effect. When used together, they can encapsulate and fix the dispersed colorant particles, prevent sedimentation, make the foundation stick more evenly colored, improve the binding ability of colorant and matrix, enhance the smoothness during application, closely adhere to the skin texture, prolong the makeup time, and avoid the stickiness problem of traditional all-oil systems.

[0021] The skin conditioning agent of this invention is preferably at least one selected from palmitoyl tripeptide-1, white willow bark extract, chamomile extract, centella asiatica extract, and purple echinacea extract. This skin conditioning agent not only enhances the finishing effect of makeup but also provides skincare benefits such as soothing, repairing, anti-oxidation, anti-aging, improving skin elasticity, and brightening, giving the foundation stick the dual functions of makeup and skincare.

[0022] The colorant of this invention is at least one selected from titanium dioxide, iron oxide yellow, iron oxide red, and iron oxide black. The colorant of this invention can be formulated in different proportions to obtain foundation shades of various colors, enabling the foundation stick to have the functions of skin tone correction, concealing blemishes, and evening out skin tone.

[0023] The moisturizer described in this invention is preferably at least one selected from hydrolyzed sodium hyaluronate, glycerin, 1,2-butanediol, and panthenol. This moisturizer deeply hydrates, improves skin texture, repairs the skin barrier, and promotes absorption. It balances the moisturizing and makeup-holding properties of foundation sticks, avoiding the dryness and caking issues common with traditional foundations, while also enhancing the skincare properties of foundation sticks.

[0024] The preservative described in this invention is preferably at least one of phenoxyethanol, 1,2-pentanediol, and octyl glycol.

[0025] The preparation method of the concealer and skin-adhering foundation stick of the present invention includes: heating and stirring polydimethylsiloxane, hydrogenated polyisobutylene, isononyl isononanoate, squalane, candelilla wax and microcrystalline wax to obtain an oil phase; mixing kaolin, silica, synthetic fluorophlogopite and colorant, and grinding them to obtain a powder phase; mixing a moisturizer with water to obtain an aqueous phase; mixing the powder phase, aqueous phase and oil phase, and homogenizing them to obtain a mixture; mixing the mixture with polyglycerol-10 myristate, triethoxyoctylsilane, C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, skin conditioning agent and preservative, and then molding and cooling to obtain the concealer and skin-adhering foundation stick.

[0026] The preferred heating and stirring temperature of the present invention is 80-85℃, more preferably 82℃; the preferred rotation speed is 200-300 rpm, more preferably 250 rpm; and the preferred time is 20-30 min, more preferably 25 min.

[0027] The preferred vibration frequency for the grinding process described in this invention is 15-35Hz, more preferably 20Hz; the preferred amplitude is 4-7mm, more preferably 5mm; and the preferred time is 15-20min, more preferably 18min. The grinding process of this invention can achieve a powder particle size of 1-10μm. Insufficient grinding not only causes large particles in the foundation stick to easily settle or aggregate, disrupting the oil-powder homogeneity and leading to layering or cracking of the cream, but also results in a noticeable grainy texture, increased friction coefficient, increased resistance when applying the foundation stick, affecting skin adhesion, and causing reduced coverage, creasing, and patchiness. Excessive grinding easily causes powder agglomeration, resulting in a dull makeup effect, and excessive absorption of oils in the formula, leading to dryness or cracking of the cream after application.

[0028] The homogenization pressure described in this invention is preferably 20-25 MPa, more preferably 23 MPa, and the time is preferably 10-15 min, more preferably 12 min.

[0029] The mixing speed of the present invention is preferably 200-300 rpm, more preferably 250 rpm, and the mixing time is preferably 30-40 min, more preferably 35 min.

[0030] This invention's foundation stick features a double-ended design. One end contains the foundation stick ingredients, while the other end is a 100,000-bristle M-shaped brush. It provides a delicate, soft finish, evenly distributes color, and quickly completes makeup, achieving a 10-second makeup application. This foundation stick achieves a one-touch application and an instant, seamless blending effect.

[0031] The method of using the foundation stick product of this invention is as follows: After cleansing and performing basic skin care, draw 3-4 lines on each cheek, and one line each on the forehead, nose, and chin. Use an M-shaped brush to evenly blend and spread the foundation stick. The whole process is mess-free and can be carried in a bag for touch-ups at any time.

[0032] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] Unless otherwise specified, the following embodiments are all conventional methods.

[0034] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0035] Synthetic fluorophlogopite was purchased from Hebei Jinghang Mineral Products Co., Ltd., item number hcym; polydimethylsiloxane was purchased from Shandong Yousuo Chemical Technology Co., Ltd., item number U31101145; hydrogenated polyisobutylene was purchased from Shanghai Gaoming Chemical Co., Ltd., item number 162224; isononyl isononanoate was purchased from Guangzhou Ruixin Chemical Co., Ltd., item number RX126; squalane was purchased from Xi'an Haoyu Kangze Biotechnology Co., Ltd., item number HY-698522; candelilla wax was purchased from Dongguang County Qingfeng Wax Products Factory, item number 1-11; microcrystalline wax was purchased from Dongguang County Qingfeng Wax Products Factory, item number WJL-08; polyglycerol-10 myristate was purchased from Shandong Binzhou Jinsheng New Material Technology Co., Ltd., item number SOL-1001R; triethoxyoctylsilane was purchased from Guangzhou Zhongjie Chemical Technology Co., Ltd., item number 308; C30-45 Alkyl cetearyl polydimethylsiloxane crosslinked polymer was purchased from Wuhan Kemike Biomedical Technology Co., Ltd., catalog number kmk165; white willow bark extract was purchased from Shaanxi Langde Biotechnology Co., Ltd., catalog number LDSW-2024; chamomile extract was purchased from Shaanxi Baichuan Biotechnology Co., Ltd., catalog number BCSW20180413-1; centella asiatica extract was purchased from Shaanxi Baichuan Biotechnology Co., Ltd., catalog number bc20180526-1; purple coneflower extract was purchased from Xi'an Ruien Biotechnology Co., Ltd., catalog number rn0096; hydrolyzed sodium hyaluronate was purchased from Shandong Runxin Biotechnology Co., Ltd., catalog number RX250111.

[0036] The components and their weight percentages in the foundation sticks of the examples and comparative examples are shown in Table 1.

[0037] Table 1. Composition and percentage of foundation sticks in the examples and comparative examples.

[0038] Continued from Table 1

[0039] The skin conditioning agent in Example 1 consists of equal weights of palmitoyl tripeptide-1, white willow bark extract, and chamomile extract; the colorant consists of titanium dioxide, iron oxide yellow, iron oxide red, and iron oxide black in a weight ratio of 12:1.5:0.5:0.2; the moisturizer consists of hydrolyzed sodium hyaluronate, glycerin, and 1,2-butanediol in a weight ratio of 1:7:3; and the preservative consists of phenoxyethanol and caprylyl glycol in a weight ratio of 2:1.

[0040] The skin conditioning agent in Example 2 is composed of palmitoyl tripeptide-1, centella asiatica extract and echinacea extract in a weight ratio of 2:1:1; the colorant is composed of titanium dioxide, iron oxide yellow, iron oxide red and iron oxide black in a weight ratio of 102:1.2:0.2:0.1; the moisturizer is composed of hydrolyzed sodium hyaluronate, glycerin and panthenol in a weight ratio of 1:2:1; and the preservative is 1,2-pentanediol.

[0041] The skin conditioning agent in Example 3 consists of equal weights of palmitoyl tripeptide, white willow bark extract, and centella asiatica extract; the colorant consists of titanium dioxide, iron oxide yellow, iron oxide red, and iron oxide black in a weight ratio of 12:1.7:0.6:0.3; the moisturizer consists of hydrolyzed sodium hyaluronate, glycerin, and 1,2-butanediol in a weight ratio of 1:7:3; and the preservative consists of phenoxyethanol and 1,2-pentanediol in a weight ratio of 3:2.

[0042] Comparative Examples 1-7 contain the same skin conditioning agents, colorants, moisturizers, and preservatives as in Example 1.

[0043] The preparation methods of the foundation sticks in Examples 1-3, Comparative Examples 1-3, and Comparative Examples 6-7 are as follows: Polydimethylsiloxane, hydrogenated polyisobutylene, isononyl isononanoate, squalane, candelilla wax, and microcrystalline wax are stirred at 82°C and 250 rpm for 25 min to obtain an oil phase; Kaolin, silica, synthetic fluorophlogopite, and colorant are mixed and ground with a vibratory mill at a vibration frequency of 20 Hz and an amplitude of 5 mm for 18 min to obtain a powder phase; Moisturizer and water are mixed to obtain an aqueous phase; The powder phase, aqueous phase, and oil phase are mixed and homogenized at 23 MPa for 12 min to obtain a mixture; The mixture is mixed with polyglycerol-10 myristate, triethoxyoctylsilane, C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, skin conditioning agent, and preservative and stirred at 250 rpm for 35 min, then molded and cooled to obtain a concealing and skin-adhering foundation stick.

[0044] The difference between the foundation stick in Comparative Example 4 and the preparation method described above is that the powder phase is prepared by mixing kaolin, silica, synthetic fluorophlogopite and colorant, and grinding it for 10 minutes using a vibratory mill at a vibration frequency of 10 Hz and an amplitude of 3 mm.

[0045] The difference between the foundation stick in Comparative Example 5 and the preparation method described above is that the powder phase is prepared by mixing kaolin, silica, synthetic fluorophlogopite and colorant, and grinding it for 20 minutes using a vibratory mill at a vibration frequency of 40 Hz and an amplitude of 8 mm.

[0046] Experimental Example 1 stability The stability of the foundation sticks in Examples 1-3 and Comparative Examples 1-7 were tested respectively, and the specific results are shown in Table 2.

[0047] Take 50g of foundation stick and perform the following stability tests: High temperature test: Place at 50℃ for 1 month, and observe whether deformation or oil seepage occurs after returning to room temperature.

[0048] Low temperature test: Placed at -12℃ for 1 month, and then checked for crystallization after returning to room temperature.

[0049] High and low temperature cycle test: alternating high and low temperature cycles (12 hours at 50℃, 12 hours at -12℃), after returning to room temperature, observe whether there is stratification, deformation, oil seepage, crystallization or particle precipitation.

[0050] Table 2. Stability of foundation sticks in each group

[0051] As shown in Table 2, the foundation stick prepared using the methods described in the examples exhibits excellent heat resistance, cold resistance, and stability under alternating high and low temperatures. Examples 1 and Comparative Examples 1-3 demonstrate that the triethoxyoctylsilane and C30-45 alkyl cetearyl polydimethylsiloxane crosslinked polymer are key components in maintaining the stability of the foundation stick. Examples 1 and Comparative Examples 6-7 show that when the weight ratio of triethoxyoctylsilane to C30-45 alkyl cetearyl polydimethylsiloxane crosslinked polymer is 1-2:1-2, it has a synergistic effect on the stability of the foundation stick, resulting in excellent heat resistance, cold resistance, and stability under alternating high and low temperatures. Examples 1 and Comparative Examples 4-5 indicate that the grinding frequency and time of the powder phase affect the stability of the foundation stick.

[0052] Experimental Example 2 Human skin patch experiment The test was conducted according to the human skin patch test in accordance with the "Cosmetic Safety Technical Specifications".

[0053] Subjects selected in accordance with the "Cosmetic Safety Technical Specifications" were randomly divided into 10 groups of 10 people each. There were no significant differences in age, skin condition, etc. among the groups.

[0054] 0.025g of foundation sticks from Examples 1-3 and Comparative Examples 1-7 were placed into 12mm diameter patch chambers, respectively. A control chamber without any substance was used as a blank control group. The patch chambers containing the foundation sticks were applied to the backs of the subjects using hypoallergenic adhesive tape, and gently pressed with the palm of the hand to ensure even application to the skin for 24 hours. Skin reactions were observed according to the standards in Table 3 at 30 minutes (after the indentation disappeared), 24 hours, and 48 hours after the foundation sticks were removed, and the results were recorded.

[0055] Table 3. Grading Criteria for Skin Reactions in Occlusive Patch Tests

[0056] Observation results: 30 min, 24 h and 48 h after removing the foundation stick from the patch chamber, the foundation sticks of Examples 1-3 and Comparative Examples 1-7 as well as the blank control groups of each group had a score of 0, that is, the foundation sticks of the Examples and Comparative Examples had no adverse reactions and were safe.

[0057] Experimental Example 3 Concealer and skin-adhesion test The subjects in Experiment 1 were randomly divided into 10 groups of 10 people each. There were no significant differences in age, skin condition, etc. among the groups. Subjects used foundation sticks from Examples 1-3 and Comparative Examples 1-7 for 10 hours. The results were evaluated on four indicators: coverage, adherence to skin, staying power, and ease of application. Each indicator was scored out of 10, from 1 (poor) to 10 (excellent). The sensory evaluations of the foundation sticks for each group are shown in Table 4.

[0058] The method of use is as follows: After cleansing and performing basic skin care, draw 3-4 lines on each cheek with the foundation stick, and one line each on the forehead, sides of the nose and chin. Use an M-shaped brush to blend it evenly.

[0059] A woman aged 35 was randomly selected, and her eyes and face were photographed before and after use in natural light. The results are as follows. Figure 1 As shown.

[0060] Table 4 Sensory evaluation scores for each group of foundation sticks

[0061] As shown in Table 4, the examples significantly outperformed the comparative examples in terms of coverage, skin adherence, makeup lasting power, and blendability. This is due to the complete formulation design, including the rational ratio of key ingredients (triethoxyoctylsilane and C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer) and the optimized powder phase preparation process. Comparative Examples 1-7: Sensory scores varied due to the lack of key ingredients or different preparation processes. Comparative Example 3 was the worst, indicating that the lack of key ingredients significantly reduced the sensory evaluation of the foundation stick, demonstrating that the synergistic effect of triethoxyoctylsilane and C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer is crucial for product stability and sensory performance. A comparison of Example 1 and Comparative Examples 4-5 shows that the grinding frequency and time of the powder phase affect product stability, but have a relatively small impact on sensory performance.

[0062] From three aspects: concealing effect, skin adherence and makeup evenness, and skin tone correction effect. Figure 1 Analysis: Concealing effect: Before use, the subject had obvious blemishes on the face, moderate dark circles under the eyes, uneven skin tone and clear blemish outlines; after use, the blemishes and dark circles were evenly covered, and the blemish area transitioned naturally with the surrounding skin tone, without any mask-like or heavy accumulation. This indicates that the present invention, through the compound system of kaolin, silica and synthetic fluorophlogopite, achieves a balance between high concealing power and natural makeup effect, and can effectively modify stubborn skin blemishes.

[0063] Adhesion and evenness of makeup effect: Before use, the subjects' facial skin texture was more obvious. After use, the foundation adhered closely to the skin without any powdery or creasing phenomenon. Pores were naturally filled, and the skin presented a delicate soft-focus texture. Moreover, the makeup effect of the whole face was even and consistent, without any local patchiness or color difference. This confirms the synergistic effect of polydimethylsiloxane and multi-oil, which significantly improved the product's adherence and spreadability.

[0064] Skin tone correction effect: Before use, the subject's skin tone was dull with some yellowish deposits; after use, the skin tone was evenly brightened, presenting a clear and natural healthy glow. Moreover, the skin tone correction effect closely matched the original skin texture, without any fake white or grayish appearance. This reflects the scientific ratio of the colorant, which can accurately adjust the skin tone and achieve the dual effect of natural concealing and skin tone optimization.

[0065] Figure 1 The invention directly verifies the core efficacy of the foundation stick, which provides one-touch application and instant skin-feeling. It also demonstrates excellent performance in terms of high coverage, superior skin adherence, even makeup effect, and skin tone correction.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A concealing and skin-adhering foundation stick, characterized in that, It comprises the following components in parts by weight: 15-20 parts kaolin, 5-10 parts silica, 1-3 parts synthetic fluorophlogopite, 6-12 parts polydimethylsiloxane, 4-8 parts hydrogenated polyisobutylene, 3-6 parts isononyl isononanoate, 2-5 parts squalane, 6-8 parts candelilla wax, 3-5 parts microcrystalline wax, 1-2 parts polyglycerol-10 myristate, 1-2 parts triethoxyoctylsilane, 1-2 parts C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, 2-5 parts skin conditioning agent, 8-12 parts colorant, 5-8 parts moisturizer, 0.1-0.4 parts preservative, and 5-10 parts water.

2. The concealer and skin-adhering foundation stick according to claim 1, characterized in that, The skin conditioning agent is at least one of palmitoyl tripeptide-1, white willow bark extract, chamomile extract, centella asiatica extract, and purple echinacea extract.

3. The concealer and skin-adhering foundation stick according to claim 1, characterized in that, The colorant is at least one of titanium dioxide, iron oxide yellow, iron oxide red, and iron oxide black.

4. The concealer and skin-adhering foundation stick according to claim 1, characterized in that, The moisturizer is at least one of hydrolyzed sodium hyaluronate, glycerin, 1,2-butanediol and panthenol.

5. The concealer and skin-adhering foundation stick according to claim 1, characterized in that, The preservative is at least one of phenoxyethanol, 1,2-pentanediol, and octyl glycol.

6. A method for preparing a concealing and skin-adhering foundation stick according to any one of claims 1-5, characterized in that, include: Polydimethylsiloxane, hydrogenated polyisobutylene, isononyl isononate, squalane, candelilla wax, and microcrystalline wax are heated and stirred to obtain an oil phase; kaolin, silica, synthetic fluorophlogopite, and colorant are mixed and ground to obtain a powder phase; a moisturizer is mixed with water to obtain an aqueous phase; the powder phase, aqueous phase, and oil phase are mixed and homogenized to obtain a mixture; the mixture is then mixed and stirred with polyglycerol-10 myristate, triethoxyoctylsilane, C30-45 alkyl cetearyl polydimethylsiloxane crosspolymer, skin conditioning agent, and preservative, and then molded and cooled to obtain the concealer / skin-adhering foundation stick.

7. The preparation method according to claim 6, characterized in that, The heating and stirring temperature is 80-85℃, the rotation speed is 200-300rpm, and the time is 20-30min.

8. The preparation method according to claim 6, characterized in that, The grinding process involves a vibration frequency of 15-35Hz, an amplitude of 4-7mm, and a duration of 15-20min.

9. The preparation method according to claim 6, characterized in that, The homogenization pressure is 20-25 MPa, and the time is 10-15 min.

10. The preparation method according to claim 6, characterized in that, The mixing speed is 200-300 rpm, and the time is 30-40 min.

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