Preservative-free cosmetic composition for barrier repair as well as preparation method and application of preservative-free cosmetic composition

Abstract

The invention relates to the technical field of cosmetics, in particular to a preservative-free cosmetic composition for barrier repair as well as a preparation method and application of the preservative-free cosmetic composition. The invention relates to a preservative-free cosmetic composition for barrier repair, which comprises the following components in percentage by weight: 4.0-6.0% of 1, 2-pentanediol; 0.5% to 1.0% of 1, 2-hexanediol; 0.1% to 0.5% of cerayl; 0.5%-1.0% of phytosterol; 4.0%-6.0% of stearic acid; 4.0%-7.0% of hydrogenated lecithin; 0 to 0.3 percent of caryophylline; 0-0.2% of a eucommia ulmoides bark extract; and the balance of water. The composition of 1, 2-pentanediol and 1, 2-hexanediol is adopted to replace a traditional chemical preservative, and on the premise that the preservative effect is achieved, the possibility of causing skin irritation and allergy risks is reduced; ceramide and phytosterol can participate in construction of a skin barrier and supplement and repair a lipid structure of the skin barrier; stearic acid and hydrogenated lecithin form a stable emulsification basis, so that the two long-term contradictory requirements of no chemical preservative stimulation and effective barrier repair are met, and the unification of product safety and efficacy is realized.

Description

Technical Field

[0001] This application relates to the field of cosmetic technology, and in particular to a preservative-free cosmetic composition for barrier repair, its preparation method, and its application. Background Technology

[0002] The skin is the body's first physiological barrier. The integrity of its barrier function is crucial for maintaining skin health, preventing excessive moisture loss, and resisting external irritants and microbial invasion. Damage to the skin barrier is closely related to a variety of skin problems, such as dryness, sensitivity, and atopic dermatitis. Therefore, repairing the skin barrier has become one of the core goals of functional cosmetics research and development.

[0003] To achieve this goal, product formulations often need to add active ingredients with clear repair effects, such as ceramides and cholesterol. However, these nutrient-rich matrices are also prone to microbial growth. Therefore, chemical preservatives, such as parabens and phenoxyethanol, are often added to cosmetics to ensure the safety of the product during use. However, commonly used chemical preservatives can cause skin irritation, allergies, and even disrupt the stability of the skin's microecological system, making it difficult to achieve a balance between safety and efficacy.

[0004] Therefore, there is an urgent need for an innovative formulation technology that enables products to achieve excellent biostability and skin barrier repair function without relying on chemical preservatives. Summary of the Invention

[0005] In order to ensure the microbial stability of cosmetics without adding chemical preservatives, this application provides a preservative-free cosmetic composition for barrier repair, its preparation method and application.

[0006] In a first aspect, this application provides a preservative-free cosmetic composition for barrier repair, employing the following technical solution: A preservative-free cosmetic composition for barrier repair comprises the following components by weight percentage: 1,2-Pentanediol 4.0%-6.0%; 1,2-Hexanediol 0.5%-1.0%; Ceramide 0.1%-0.5%; Phytosterols 0.5%-1.0%; Stearic acid 4.0%-6.0%; Hydrogenated lecithin 4.0%-7.0%; Caryophyllin 0-0.3%; Eucommia bark extract 0-0.2%; Glycerin 0-8.0%; The remainder is water.

[0007] By adopting the above technical solution, a combination of 1,2-pentanediol and 1,2-hexanediol is used to replace traditional chemical preservatives. While maintaining preservative effects, this reduces the possibility of skin irritation and allergic reactions. Ceramides and phytosterols can participate in the construction of the skin barrier, supplementing and repairing the lipid structure of the skin barrier. Stearic acid and hydrogenated lecithin form a stable emulsification basis, simultaneously and effectively solving the long-standing conflict between the needs of "no chemical preservative irritation" and "effective barrier repair," thus achieving a balance between product safety and efficacy.

[0008] Preferably, the weight ratio of the ceramide to the phytosterol is 1:(2.5-5).

[0009] By adopting the above technical solution and controlling the weight ratio of ceramide to phytosterol at 1:(2.5-5), the two can work synergistically. Ceramide can fill intercellular lipids, enhance skin barrier function, and reduce moisture loss; phytosterol has anti-inflammatory and soothing effects, can regulate skin metabolism, and together help repair the skin barrier, thereby enhancing the repair effect of cosmetic compositions on the skin barrier.

[0010] Preferably, the weight ratio of 1,2-pentanediol to 1,2-hexanediol is (5-10):1.

[0011] By adopting the above technical solution, the synergistic effect of the two can be better utilized. When the two are combined in this ratio, not only can a traditional preservative-free preservation system be constructed, avoiding the irritation risk brought by chemical preservatives, but the stability and safety of the composition can also be improved while ensuring the microbial safety of the product. This enhances the moisturizing and antibacterial properties of the cosmetic composition and helps to better achieve the skin barrier repair effect.

[0012] Preferably, the ceramide is selected from either ceramide NS or ceramide NP.

[0013] By adopting the above technical solution and selecting ceramide NS or ceramide NP as the ceramide component, it is possible to better mimic the lipid composition of the skin itself, enhance the affinity with the skin barrier, thereby more effectively filling intercellular lipids, improving the integrity and stability of the skin barrier, and thus enhancing the skin barrier repair ability of the cosmetic composition.

[0014] Preferably, the phytosterol is selected from any one of campesterol, stigmasterol, and β-sitosterol.

[0015] By adopting the above technical solution, phytosterols have good skin affinity and stability, can enhance the skin barrier function, promote skin cell metabolism, improve the skin's moisturizing ability, and reduce moisture loss, thereby better exerting the skin barrier repair effect of cosmetic compositions.

[0016] Preferably, the content of caryophyllin is 0.05%-0.3% of the total weight of the composition.

[0017] By adopting the above technical solution, caryophyllin is added to the preservative-free cosmetic composition at a content of 0.05%-0.3% of the total weight of the composition. Caryophyllin has certain biological activity, which can promote the metabolism of skin cells, enhance the vitality of skin cells, thereby enhancing the self-repair ability of the skin barrier and thus enhancing the barrier repair effect.

[0018] Preferably, the content of the Eucommia bark extract is 0.05%-0.2% of the total weight of the composition.

[0019] By adopting the above technical solution, adding 0.05%-0.2% of Eucommia bark extract to the composition can further synergistically enhance the barrier repair effect. Eucommia bark extract is rich in active ingredients such as flavonoids and iridoids, which can promote skin metabolism and enhance self-repair ability, thereby helping to improve the overall repair efficiency of the skin barrier.

[0020] Preferably, the content of glycerol is 2.0%-8.0% of the total weight of the composition.

[0021] By adopting the above technical solution, adding glycerin to the composition can enhance the synergistic effect of moisturizing and repair. Glycerin has excellent hygroscopic properties, which can effectively increase the water content of the stratum corneum, maintain the skin's hydration environment, and provide favorable conditions for barrier repair.

[0022] Secondly, this application provides a method for preparing a preservative-free cosmetic composition for barrier repair, employing the following technical solution: A method for preparing a preservative-free cosmetic composition for barrier repair includes the following steps: (1) mixing stearic acid, hydrogenated lecithin, phytosterol, ceramide, and caryophyllin and heating to 75-80°C to dissolve and obtain an oil phase; (2) Glycerin, 1,2-pentanediol, 1,2-hexanediol, Eucommia bark extract and water were mixed and heated to 75-80℃ to obtain an aqueous phase; (3) Add the oil phase to the aqueous phase, homogenize and emulsify at 75-80°C, and then cool to obtain the composition.

[0023] By adopting the above technical solution, the components are fully mixed to form a stable preservative-free cosmetic composition, effectively obtaining a preservative-free cosmetic composition for barrier repair, ensuring that the components are evenly dispersed, which is conducive to the composition's efficacy in repairing the skin barrier.

[0024] Thirdly, this application provides the use of a preservative-free cosmetic composition for barrier repair in the preparation of cosmetics for repairing the skin barrier.

[0025] By adopting the above technical solution, the composition combines a preservative-free safety system with highly effective barrier repair active ingredients, which can be applied to the preparation of cosmetics. While ensuring product stability, it can quickly replenish lipids, enhance the hydration capacity of the stratum corneum, and promote skin self-repair, thus achieving rapid repair of the skin barrier.

[0026] In summary, this application has the following beneficial effects: 1. Because this application uses a specific ratio of 1,2-pentanediol and 1,2-hexanediol to construct the system's own intrinsic preservative ability, replacing traditional chemical preservatives, it fundamentally reduces the potential irritation and allergy risk of the product. At the same time, by introducing ceramides and phytosterols, it directly replenishes and repairs the key lipid structure of the skin barrier, while stearic acid and hydrogenated lecithin form a stable emulsion matrix. The specific combination of the above components works synergistically to simultaneously achieve the two major functions of no irritation from traditional preservatives and efficient barrier repair, effectively solving the long-standing contradiction in the cosmetics field of difficulty in simultaneously achieving both preservation and repair. 2. This application successfully prepared a preservative-free cosmetic composition with a stable structure by fully mixing and emulsifying the components under specific temperature and homogenization conditions. This process ensures that all components, including active lipids, are uniformly dispersed and form a stable microstructure, which provides a guarantee for the stable and uniform performance of the composition in repairing the skin barrier. 3. The composition of this application combines a preservative-free safety system with highly effective barrier repair active ingredients and is applied to the preparation of cosmetics. It not only has good product stability, but also can quickly replenish skin lipids, enhance the hydration capacity of the stratum corneum, and promote the skin's self-repair process, thereby achieving rapid and effective repair of the skin barrier. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments.

[0028] Performance testing 1. Anti-corrosion challenge test Test Method: The test used five standard challenge strains specified in the "Technical Guidelines for Cosmetic Preservative Challenge Testing and Evaluation": Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa (three bacteria), and Candida albicans and Aspergillus niger (two fungi). First, the neutralizing agent was tested to verify its effectiveness in neutralizing the antibacterial activity of the samples. Suspensions of each strain were inoculated into the samples to achieve an initial bacterial concentration (N0) of 1.0 × 10⁻⁶. 5 -1.0×10 6 CFU / g, fungi reached 1.0×10 4 -1.0×10 5 CFU / g, the inoculated samples were incubated at 25±1℃, and samples were taken on day 28 (D28). After recovery with a proven effective neutralizing agent, plate counts were performed, and the log reduction value (R value) of microorganisms on day 28 (D28) was calculated. The calculation formula is R28=lg(N0)−lg(N28).

[0029] Evaluation criteria: Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa, R28 ≥ 3.0; R28 ≥ 1.0 for Candida albicans and Aspergillus niger.

[0030] 2. Evaluation of the efficacy of external barrier repair Test conditions and methods: The test was conducted in a constant temperature and humidity laboratory (temperature 20±1°C, relative humidity 50±5%). Healthy volunteers with mild skin barrier dysfunction were recruited and measured on the flexor side of their forearms. A professional TEWL tester (Tewameter® TM 300) was used. First, the baseline value (T0) was measured when no sample was applied. Then, the sample was evenly applied at the standard dosage (2.0 mg / cm²), and the TEWL value (g / m²·h) was measured at 4 hours after application (T4) to evaluate the immediate repair and water-locking effect. Each data point is the average of 3 measurements.

[0031] Evaluation criterion: The decrease in TEWL (Δ) between T4 and T0. Excellent repair: Δ≥6.0g / m².h; Significant repair: 5.0 ≤ Δ < 6.0 g / m².h; Effective repair: 3.0 ≤ Δ < 5.0 g / m².h; Moderate repair effect: 2.0 ≤ Δ < 3.0 g / m².h; The repair effect is weak: 1.0 ≤ Δ < 2.0 g / m².h; Repair effect ineffective: Δ<1.0g / m².h.

[0032] Examples 1-3 A preservative-free cosmetic composition for barrier repair, the raw materials and their amounts are shown in Table 1 (kg) below, and it is prepared using the following steps: (1) Stearic acid, hydrogenated lecithin, phytosterol, ceramide and caryophyllin are mixed and heated to 78°C to dissolve and obtain the oil phase; (2) Glycerin, 1,2-pentanediol, 1,2-hexanediol, Eucommia bark extract and water were mixed and heated to 78°C to obtain an aqueous phase; (3) Add the oil phase to the water phase stirred at 800 rpm, keep the temperature at 78°C, homogenize and emulsify for 4 minutes at 3000 rpm using a homogenizer, and cool to 30°C to obtain a white and delicate cream.

[0033]

[0034] In the table above, ceramide refers to ceramide NS, which was purchased from Wuhan Nengren Pharmaceutical Chemical Co., Ltd. The phytosterol was campesterol, purchased from Shanghai Huayuan Biochemical Technology Co., Ltd. Hydrogenated lecithin was purchased from Shanghai Huayuan Biochemical Technology Co., Ltd.

[0035] Comparative Example 1 A cosmetic composition for barrier repair, differing from Example 1 in that it does not contain 1,2-pentanediol, and its proportion is made up by water.

[0036] Comparative Example 2 A cosmetic composition for barrier repair, differing from Example 1 in that it does not contain 1,2-hexanediol, and its proportion is made up by water.

[0037] Comparative Example 3 A cosmetic composition for barrier repair, differing from Example 1 in that it does not contain 1,2-pentanediol and 1,2-hexanediol, and the proportions are made up by water.

[0038] Comparative Example 4 A cosmetic composition for barrier repair differs from Example 1 in that 0.4% phenoxyethanol and 0.2% methylparaben are used instead of 1,2-pentanediol and 1,2-hexanediol, with any shortfall made up by water.

[0039] Comparative Example 5 A preservative-free cosmetic composition differs from Example 1 in that it does not contain ceramides, and the proportion is made up by water.

[0040] Comparative Example 6 A preservative-free cosmetic composition, which differs from Example 1 in that it does not contain phytosterols, and the proportion is made up by water.

[0041] Comparative Example 7 A preservative-free cosmetic composition differs from Example 1 in that it does not contain phytosterols or ceramides, and the proportions are made up by water.

[0042] Test samples corresponding to Examples 1-3 and Comparative Examples 1-7 were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms R28 on day 28 (D28) was calculated. The average value of the test results was recorded in Table 2 below.

[0043]

[0044] As shown in Table 2, for one of the preservative-free cosmetic compositions for barrier repair in Examples 1-3, the TEWL reduction value at T4 compared to T0 was Δ = 5.2-5.9 g / m². 2 The barrier repair capability was significant, and all comprehensive anti-corrosion evaluations were passed, demonstrating excellent barrier repair and sufficient self-preservation capabilities, achieving outstanding microbial stability. In comparative examples 1-3 and 5-7, the TEWL reduction value of T4 compared to T0 was Δ = 0.7-2.5 g / m. 2 The barrier repair ability of Example 1 was moderate, weak or even ineffective, and the overall anti-corrosion evaluation was not passed. In Comparative Example 4, a traditional anti-corrosion agent was used and the overall anti-corrosion evaluation was passed, but its barrier repair ability was effective, and the repair effect was far inferior to that of Examples 1-3.

[0045] As shown in Examples 1-3, Comparative Examples 1-7, and Table 2, the specific quaternary synergistic system composed of 1,2-pentanediol, 1,2-hexanediol, ceramide, and phytosterol exhibits a unique characteristic. In this system, the polyols not only exert antibacterial effects but may also promote the penetration and arrangement of lipid components. Simultaneously, the lipids, while replenishing the skin barrier, work with the polyols to form a stable structure unfavorable to microbial colonization. Through intermolecular synergy, significant barrier repair and self-preservation capabilities are simultaneously achieved, providing reliable microbial stability. The absence of any core component or its replacement with a traditional preservative would lead to a significant reduction or loss of these dual effects.

[0046] Examples 4-7 A preservative-free cosmetic composition for barrier repair differs from Example 1 in that, while maintaining the same weight of ceramide, the weight ratio of ceramide to phytosterols is different, as shown in Table 3 below:

[0047] Test samples corresponding to Examples 4-7 above were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms on day 28 (D28) was calculated. The average value of the test results was recorded in Table 4 below.

[0048]

[0049] Combining Examples 1 and 4-7 with Table 4, it can be seen that the TEWL of T4 is reduced by Δ = 4.5-7.1 g / m³ compared to T0. 2 The barrier repair capability demonstrated in the .h example is effective, excellent, and significant. It passed the comprehensive anti-corrosion evaluation and showed excellent barrier repair capability and sufficient self-anti-corrosion capability, achieving excellent microbial stability.

[0050] The TEWL reduction values ​​Δ in Examples 1, 4, and 5 were 5.2-7.1 g / m³. 2 The reduction values ​​of ceramide to phytosterol were higher than those of Examples 6 and 7, and the reduction values ​​for 3 bacteria and 2 fungi were also higher, at 3.3-4.7 and 1.3-2.8 respectively, indicating that the optimal weight ratio of ceramide to phytosterol is 1:(2.5-5).

[0051] The TEWL reduction value in Example 5 was Δ = 7.1 g / m³. 2 The TEWL reduction values ​​were the highest for .h compared to Examples 1, 4, 6, and 7, and the reduction values ​​for 3 bacteria and 2 fungi were also the highest, at 4.3-4.7 and 2.0-2.8 respectively, indicating that the optimal weight ratio of ceramide to phytosterol is 1:3.75.

[0052] Examples 8-11 A preservative-free cosmetic composition for barrier repair differs from Example 1 in that, while maintaining the same weight of 1,2-hexanediol, the weight ratio of 1,2-pentanediol to 1,2-hexanediol is different, as shown in Table 5 below:

[0053] Test samples corresponding to Examples 8-11 above were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms on day 28 (D28) was calculated. The average value of the test results was recorded in Table 6 below.

[0054]

[0055] Combining Examples 1, 8-11, and Table 6, it can be seen that the TEWL reduction value of T4 compared to T0 is Δ = 4.5-5.2 g / m³. 2 The barrier repair capability demonstrated in the .h example was effective and significant, and all comprehensive anti-corrosion evaluations were passed, exhibiting excellent barrier repair capability and sufficient self-anti-corrosion capability, achieving outstanding microbial stability.

[0056] The TEWL reduction values ​​Δ for Examples 1, 8, and 9 were 4.8-5.2 g / m³. 2 The TEWL reduction values ​​of .h are higher than those of Examples 10 and 11, and the reduction values ​​for 3 bacteria and 2 fungi are also higher, at 3.1-4.0 and 1.1-1.8 respectively, indicating that the optimal weight ratio range of ceramide to phytosterol is (5-10):1.

[0057] The TEWL reduction value in Example 1 was Δ = 5.2 g / m³. 2 The TEWL reduction values ​​were the highest for .h compared to Examples 1, 8, 10, and 11, and the reduction values ​​for 3 bacteria and 2 fungi were also the highest, at 3.3-3.8 and 1.3-1.8 respectively, indicating that the optimal weight ratio of ceramide to phytosterol is 8:1. Example

[0058] A preservative-free cosmetic composition for barrier repair, differing from Example 1 in that the ceramide is ceramide NP, which was purchased from Hangzhou Weibaolai Biotechnology Co., Ltd.

[0059] Examples 13-14 A preservative-free cosmetic composition for barrier repair differs from Example 1 in that it contains different types of phytosterols, as detailed in Table 7 below:

[0060] Test samples corresponding to Examples 12-14 above were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms on day 28 (D28) was calculated. The average value of the test results was recorded in Table 8 below.

[0061]

[0062] As can be seen from Examples 12-14 and Table 8, the TEWL reduction value of T4 compared to T0 is Δ = 4.8-5.1 g / m³. 2The barrier repair capability demonstrated in the .h example was effective and significant, and all comprehensive anti-corrosion evaluations were passed, exhibiting excellent barrier repair capability and sufficient self-preservation capability, achieving outstanding microbial stability. This indicates that selecting different types of ceramides and phytosterols can achieve excellent barrier repair and self-preservation capabilities.

[0063] Examples 15-17 A preservative-free cosmetic composition for barrier repair differs from Example 1 in that it contains different amounts of caryophyllin. The specific components and their weights in Examples 15-17 are shown in Table 9 below.

[0064]

[0065] Test samples corresponding to Examples 15-17 above were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms on day 28 (D28) was calculated. The average value of the test results was recorded in Table 10 below.

[0066]

[0067] Based on Examples 1 and 15-17, and referring to Table 10, it can be seen that the TEWL reduction value of T4 compared to T0 is Δ = 5.2-6.3 g / m³. 2 The barrier repair capabilities of the examples were significant and excellent, and all of them passed the comprehensive anti-corrosion evaluation, demonstrating excellent barrier repair capabilities and sufficient self-preservation capabilities, achieving excellent microbial stability. The TEWL reduction values ​​and immediate repair evaluations of Examples 15-17 were higher than those of Example 1, indicating that the addition of caryophyllin further improved the repair effect and had a good synergistic effect with the system.

[0068] Examples 18-20 A preservative-free cosmetic composition for barrier repair differs from Example 15 in that it contains a different amount of Eucommia ulmoides bark extract. The specific components and their weights in Examples 18-20 are shown in Table 11 below.

[0069] Test samples corresponding to Examples 18-20 above were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms on day 28 (D28) was calculated. The average value of the test results was recorded in Table 12 below.

[0070]

[0071] Based on Examples 15, 18-20, and Table 12, it can be seen that the TEWL reduction value of T4 compared to T0 is Δ = 5.6-6.5 g / m³. 2 The barrier repair capabilities of the .h examples were significant and excellent, and all passed the comprehensive antiseptic evaluation, demonstrating excellent barrier repair capabilities and sufficient self-preservation capabilities, achieving excellent microbial stability. The TEWL reduction values ​​and immediate repair evaluations of Examples 18-20 were higher than those of Example 15, indicating that Eucommia bark extract can effectively enhance the system's repair capabilities, promote deeper skin health, and thus provide additional support for the long-term stability of barrier function.

[0072] Examples 21-23 A preservative-free cosmetic composition for barrier repair differs from Example 18 in that it contains a different amount of glycerin. The specific components and their weights in Examples 21-23 are shown in Table 13 below.

[0073] Test samples corresponding to Examples 21-23 above were extracted and tested according to the aforementioned performance testing method. The baseline value (T0) and the TEWL value 4 hours after coating (T4) were measured respectively. The log reduction value of microorganisms on day 28 (D28) was calculated. The average value of the test results was recorded in Table 14 below.

[0074]

[0075] Combining Examples 21-23 and Example 18 with Table 14, it can be seen that the TEWL reduction value of T4 compared to T0 is Δ = 3.8-5.7 g / m³. 2 In the embodiments, the barrier repair ability is effective and significant, and the comprehensive evaluation of antiseptic properties is passed, demonstrating excellent barrier repair ability and sufficient self-preservation ability, achieving excellent microbial stability. Glycerin is a recognized hygroscopic moisturizer in the field. Experiments show that when its content is controlled at 2.0%-8.0%, it can give the product a good moisturizing feel while ensuring that the product's barrier repair and self-preservation efficacy are maintained, achieving a balance between efficacy and user experience.

[0076] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A preservative-free cosmetic composition for barrier repair, characterized in that: Includes the following components by weight percentage: 1,2-Pentanediol 4.0%-6.0%; 1,2-Hexanediol 0.5%-1.0%; Ceramide 0.1%-0.5%; Phytosterols 0.5%-1.0%; Stearic acid 4.0%-6.0%; Hydrogenated lecithin 4.0%-7.0%; Caryophyllin 0-0.3%; Eucommia bark extract 0-0.2%; Glycerin 0-8.0%; The remainder is water.

2. The preservative-free cosmetic composition for barrier repair according to claim 1, characterized in that: The weight ratio of the ceramide to the phytosterol is 1:(2.5-5).

3. The preservative-free cosmetic composition for barrier repair according to claim 1, characterized in that: The weight ratio of 1,2-pentanediol to 1,2-hexanediol is (5-10):

1.

4. The preservative-free cosmetic composition for barrier repair according to claim 1, characterized in that: The ceramide is selected from either ceramide NS or ceramide NP.

5. The preservative-free cosmetic composition for barrier repair according to claim 1, characterized in that: The phytosterols are selected from any one of campesterol, stigmasterol, and β-sitosterol.

6. The preservative-free cosmetic composition for barrier repair according to claim 1, characterized in that: The content of caryophyllin is 0.05%-0.3% of the total weight of the composition.

7. A preservative-free cosmetic composition for barrier repair according to claim 6, characterized in that: The content of the Eucommia bark extract is 0.05%-0.2% of the total weight of the composition.

8. A preservative-free cosmetic composition for barrier repair according to claim 7, characterized in that: The content of glycerol is 2.0%-8.0% of the total weight of the composition.

9. A method for preparing a preservative-free cosmetic composition for barrier repair as described in any one of claims 1-8, characterized in that: Includes the following steps: (1) Stearic acid, hydrogenated lecithin, phytosterol, ceramide and caryophyllin are mixed and heated to 75-80℃ to dissolve and obtain the oil phase; (2) Glycerin, 1,2-pentanediol, 1,2-hexanediol, Eucommia bark extract and water were mixed and heated to 75-80℃ to obtain an aqueous phase; (3) Add the oil phase to the aqueous phase, homogenize and emulsify at 75-80°C, and then cool to obtain the composition.

10. The use of the preservative-free cosmetic composition for barrier repair according to any one of claims 1-8 in the preparation of cosmetics for repairing the skin barrier.

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