Pre-makeup cream with ultrahigh water content and preparation method of pre-makeup cream

Abstract

The invention provides pre-makeup cream with ultrahigh water content and a preparation method of the pre-makeup cream. The formula comprises 75-80% of water, 0.5-1% of an emulsifier, 1-10% of polydimethylsiloxane, 1-10% of isononyl isononanoate, 1-10% of linear synthetic wax, 0.5-1% of microcrystalline wax, 1-30% of a humectant and 0.5-1% of a stabilizer, wherein the mass ratio of the synthetic wax to the polydimethylsiloxane is 1: 3. The preparation method comprises the following steps: preparing an external phase: mixing synthetic wax and the like, heating to 90 DEG C and dissolving; preparing an inner phase: mixing water and the like, heating to 80 DEG C, and dissolving; emulsifying: adding the internal phase into the external phase, and homogenizing and emulsifying; and molding, filling the material into a mold, cooling and demolding. The synthetic wax with a straight chain structure and polydimethylsiloxane with the viscosity of 1000cst are compounded to form a closed film, so that moisture volatilization is reduced, and the makeup effect is improved; and the high-isomerism microcrystalline wax improves the hardness of the paste and is convenient to dip. The unique formula enables the water content to be far higher than that of a traditional system, the multi-layer humectants cooperate for long-acting moisturizing, the skin problem is improved, and make-up bottoming is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of cosmetics, and more particularly to a primer with ultra-high water content and a preparation method thereof. Background Art

[0002] Primer is a key product in modern makeup, used to optimize base makeup and improve the compatibility of skin with cosmetics. As a pre-treatment before base makeup application, it fills in minor surface irregularities, regulates oil secretion, and enhances the adhesion and long-lasting properties of subsequent makeup products, such as foundation, creating a more natural, smooth, and long-lasting appearance.

[0003] Currently available primers are typically water-in-oil (W / O) systems. Microstructurally, these systems consist of a continuous oil phase and dispersed aqueous droplets. The aqueous phase typically accounts for 40-60% of the total oil phase, and hydrophilic moisturizing ingredients such as hyaluronic acid and polyols are often added to the aqueous phase. These ingredients, with their strong water absorption and water retention properties, are designed to replenish moisture and improve hydration, thereby enhancing skin softness and elasticity, and providing a good foundation for subsequent makeup application.

[0004] However, during actual use, due to the inherent characteristics of the oil-in-water system and the influence of external environmental factors, most of the water in the aqueous phase is evaporated. On the one hand, the external phase of the oil-in-water system is the oil phase, which has certain hydrophobic and closed properties. Although it can prevent water from penetrating deep into the skin too quickly, it also limits the effective retention of water. On the other hand, factors such as the temperature, humidity, and air flow rate of the external environment can accelerate the evaporation of water. When a large amount of water in the aqueous phase evaporates, the hydrating effect originally expected to be achieved by the primer is significantly weakened. The skin may not receive sufficient moisture nourishment, which in turn affects the adherence and durability of subsequent makeup, and may even cause adverse phenomena such as dryness and flaking of the skin.

[0005] Therefore, how to optimize the formula and system of primer, reduce water volatilization, and improve its hydrating and moisturizing effect is an urgent problem to be solved in the current research and development of primer. Summary of the Invention

[0006] In order to solve the above-mentioned problems, the present application provides a primer with ultra-high water content and a preparation method thereof.

[0007] In the first aspect, the present application provides a primer with ultra-high water content using the following technical solutions: A makeup base cream with ultra-high water content, comprising the following components by weight percentage: Water 75-80%, emulsifier 0.5-1%, polydimethylsiloxane 1-10%, isononyl isononanoate 1-10%, synthetic wax 1-10%, microcrystalline wax 0.5-1%, humectant 1-30%, stabilizer 0.5-1%; The synthetic wax is a linear structured synthetic wax with a melting point ranging from 84°C to 87°C; the viscosity specification of the polydimethylsiloxane is 1000 cst; and the mass ratio of the synthetic wax to the polydimethylsiloxane in the formula is 1:3.

[0008] By adopting the above technical solution, the water content of the primer is significantly increased to 75-80%, far exceeding the 40-60% of the traditional oil-in-water system. The skin's hydration state is enhanced through the synergistic effect of moisturizers and hydrophilic ingredients. Combined with the compounding of linear synthetic wax and polydimethylsiloxane in a 1:3 ratio and the design of an emulsification stabilization system, it reduces water evaporation while ensuring high water content, ultimately improving the adhesion, durability and naturalness of the makeup, and effectively improving skin dryness, peeling and other problems, providing a better skin foundation for subsequent makeup application.

[0009] Analyze the possible reasons: The linear structure of synthetic wax molecules is relatively regular, and the intermolecular forces are relatively uniform. When forming a film, the molecules can be tightly arranged, reducing the gaps between molecules, thereby effectively blocking the escape path of water molecules and enhancing the sealing of the film. In contrast, the branched structure of synthetic wax has more branches in the molecular chain, the molecules are relatively loosely arranged, the gaps between molecules are larger, and the sealing is poor, making it difficult to effectively prevent water volatilization; The specific melting point of 85°C allows this synthetic wax to be solid at room temperature, allowing it to be fully mixed with other ingredients after melting at 90°C. Upon application to the skin and cooling, it quickly solidifies to form a stable film. If the melting point is too low, the wax may be semi-solid or liquid at room temperature, making it difficult to form an effective film structure. If the melting point is too high, it requires melting at a higher temperature, which not only increases the difficulty and energy consumption of the preparation process, but may also damage other heat-sensitive ingredients in the formula, affecting the overall performance of the product.

[0010] Polydimethylsiloxane with a viscosity of 1000 cst has a moderate viscosity. After melting at high temperature, it can fully blend with synthetic wax to form a uniform oil-wax mixture. This moderate viscosity makes the mixture have good spreadability when applied, and can evenly cover the skin surface to form a continuous and dense film. If the viscosity is too low, the fluidity of polydimethylsiloxane will be too strong, making it difficult to form a stable mixture with synthetic wax, resulting in a decrease in the uniformity and stability of the film; if the viscosity is too high, the fluidity of the mixture will deteriorate, making it difficult to spread when applied, and it will be difficult to form a complete film. It may also cause the product texture to be too thick, affecting the user experience. The viscosity of 1000 cst achieves a good balance between skin feel and closure, which can effectively reduce moisture volatilization and provide a comfortable user experience.

[0011] Linear synthetic wax and 1000 cSt polydimethylsiloxane exhibit excellent compatibility at a ratio of 1:3. During the high-temperature melting process, they mix thoroughly to form a uniform oil-wax mixture. Upon application to the skin and cooling, the two interact synergistically, with the synthetic wax providing a skeletal support and the polydimethylsiloxane filling the gaps between them. Together, they form a transparent, dense, and flexible closed film. This synergistic film-forming effect enhances the film's sealing properties, effectively preventing internal moisture from contacting the external environment and reducing water evaporation.

[0012] Furthermore, the emulsifier is cetyl PEG / PPG-10 / 1 polydimethylsiloxane.

[0013] Furthermore, the moisturizing agent is selected from one or more of glycerin, 1,3-propylene glycol / caprylyl glycol / ethylhexylglycerin, and butylene glycol.

[0014] Furthermore, the moisturizing agent consists of 1-10% of glycerin, 1-10% of 1,3-propylene glycol / caprylyl glycol / ethylhexylglycerin, and 1-10% of butylene glycol.

[0015] Furthermore, the isomerization degree of the microcrystalline wax is 100%.

[0016] Furthermore, the stabilizer is sodium chloride.

[0017] By adopting the above technical solution, a stable emulsification system for primer at a high water content of 80% was achieved. By utilizing the strong compatibility of emulsifiers and oil phase components, the synergistic water-locking mechanism of multiple moisturizers, the dense film-forming effect of high-isomerization microcrystalline wax and synthetic wax, and the precise regulation of the viscosity and charge of the system by sodium chloride, the product can be given a silky skin feel, good ductility and long-lasting moisturizing effect while ensuring its long-term stability and reducing water volatilization.

[0018] In a second aspect, the present application provides a method for preparing a primer with ultra-high water content using the following technical solutions: S1. Mixing synthetic wax, emulsifier, polydimethylsiloxane, isononyl isononanoate, and microcrystalline wax and heating to 90° C. until dissolved to obtain an external phase; S2, mixing water, a humectant, and a stabilizer and heating to 80° C. until dissolved to obtain an inner phase; S3, adding the internal phase mixed in S2 to the external phase mixed in S1, and emulsifying into a uniform material; S4. Prepare the corresponding mold, pour the dissolved material into the mold, wait for it to solidify and form, prepare the corresponding packaging material, and wait until the material is completely cooled and formed.

[0019] Furthermore, in the step S4, the temperature for solidification molding is 22-25°C, and the temperature for cooling molding is 16-18°C.

[0020] By adopting the above technical solution, the stable preparation and performance optimization of high-water-content primer are achieved: by heating and dissolving the oil phase and the water phase separately and then mixing and emulsifying them, the full fusion and emulsification stability of the oil and water phases at high water content are ensured, and phase separation or demulsification is avoided; through staged temperature control, the full dissolution and reactivity of each ingredient are guaranteed, and the gradual cooling promotes uniform solidification of the material, avoiding uneven crystallization or cracking of the paste due to sudden temperature changes, and finally forming a primer product with a fine texture, silky skin feel and excellent moisture retention.

[0021] In summary, this application has the following beneficial effects: 1. This application utilizes a linear synthetic wax and 1000 cSt polydimethylsiloxane in a 1:3 ratio to form a transparent, dense, and flexible closed film. This film significantly reduces the contact of moisture within the internal phase with the external environment, allowing for rapid evaporation, enhancing the adhesion, durability, and naturalness of the makeup. Furthermore, the high isomerization of the microcrystalline wax further improves the hardness of the paste, making it easier to dip into. 2. This application uses a unique formula design to increase the water content of the primer to 75-80%, far exceeding the traditional water-in-oil system. Combined with the synergistic effect of multiple moisturizers, it significantly enhances skin hydration, provides long-lasting moisturizing effects, effectively improves skin dryness and flaking, and provides a better skin foundation for subsequent makeup application. 3. This application achieves long-term stability of the emulsion system at high water content and avoids phase separation or demulsification through the strong compatibility of the cetyl PEG / PPG-10 / 1 polydimethylsiloxane emulsifier with the oil phase components, as well as the precise control of the viscosity and charge of the system by the sodium chloride stabilizer. At the same time, the staged temperature control ensures uniform solidification of the material, giving the product a silky skin feel and good ductility, thereby improving the user experience. DETAILED DESCRIPTION

[0022] To more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments. It should be understood that the embodiments described are only a portion of the present invention, not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0023] The purpose of the present invention is illustrated by the following examples. The components of the composition are illustrated in parts by weight as a general standard. Unless otherwise specified, for the sake of simplicity, the "parts" described in the examples of the present invention have the same meaning as parts by weight.

[0024] Unless otherwise specified, all reagents and instruments used were commercially available.

[0025] Performance testing (1) Physical and chemical performance testing The following primer products prepared in each embodiment and comparative example were subjected to various physical and chemical performance tests in accordance with the Q / SHMHT 002-2021 standard, including heat resistance at 50°C, cold resistance at -18°C, cold (-18°C) and hot (50°C) cycles, microbial detection, heavy metal detection, and other tests.

[0026] (2) Moisturizing performance test 1. Water evaporation The primers prepared in the examples and comparative examples were used as samples and applied to artificial skin membranes, with a single application amount of 10 g. The artificial skin membranes were then placed in a constant temperature and humidity chamber at 25°C and a relative humidity of 50%. The membranes were weighed after 4 hours and 24 hours, and the amount of water evaporated within 20 hours was calculated.

[0027] 2. Moisturizing effect The sample was applied to the skin on the inner side of the volunteer's arm, and a skin moisture tester was used to measure the skin moisture content before use, 1 hour after use, and 8 hours after use to evaluate the effect of hydrating and moisturizing the skin.

[0028] Example 1 A makeup base cream with ultra-high water content, consisting of the following components: The above-mentioned primer with ultra-high water content is prepared by the following method: S1. Mixing synthetic wax, emulsifier, polydimethylsiloxane, isononyl isononanoate, and microcrystalline wax and heating to 90° C. until dissolved to obtain an external phase; S2, mixing water, a humectant, and a stabilizer and heating to 80° C. until dissolved to obtain an inner phase; S3, adding the internal phase mixed in S2 to the external phase mixed in S1, and emulsifying into a uniform material; S4. Prepare the corresponding mold, pour the dissolved material into the mold, solidify and shape it at 25°C, prepare the corresponding packaging material, and wait until the material is completely cooled and formed at 18°C.

[0029] The synthetic wax is a linear structured synthetic wax with a melting point of 85° C. The viscosity of the polydimethylsiloxane is 1000 cst. The isomerization degree of the microcrystalline wax is 100%.

[0030] Various performance tests were carried out according to the above test methods, and the test results are shown in the table below.

[0031] As can be seen from the table above, the primer prepared in Example 1 performed well in all performance tests. It passed the heat resistance, cold resistance, and hot and cold cycle tests, indicating that the product remains stable under different temperature conditions and is not prone to performance changes or damage, demonstrating good environmental adaptability. It also passed the microbial and heavy metal tests, indicating that the product meets hygiene and safety standards and does not pose a potential threat to human health. In addition, the amount of water volatilization is only 1.92g, indicating that the product evaporates less water during use, which helps to maintain the skin's moisture. The skin's moisture content was 32.5% before use, and increased to 48.2% one hour after use. It still remained at 42.1% eight hours after use, showing that the product has a good moisturizing effect and can maintain the skin's moisture content for a longer period of time.

[0032] Examples 2-7 A primer with ultra-high water content is prepared by a method substantially similar to that of Example 1, with the only difference being that the amounts of the components used are different. The specific details are shown in the table below.

[0033] The primer samples prepared in Examples 2-7 were tested for various properties according to the above test methods. The test results are shown in the table below.

[0034] As can be seen from the table above, all examples passed the heat resistance, cold resistance, hot and cold cycle tests, microbial and heavy metal tests, indicating that these primer samples can remain stable under different temperature conditions and meet hygiene and safety standards. In terms of water volatilization, Example 7 performed best, with a volume of only 1.26 g, indicating that it evaporated the least during use and had a longer-lasting moisturizing effect. In terms of skin moisture content before use, 1 hour after use, and 8 hours after use, Example 7 also performed well. The skin moisture content increased to 51.5% 1 hour after use and remained at 47.7% 8 hours after use. It has the best moisturizing effect among all the examples and can therefore be used as a preferred example.

[0035] Example 8 A primer with ultra-high water content, the dosage of each component and the preparation method thereof are basically the same as those in Example 1, the only difference being that the emulsifier is PEG-10 polydimethylsiloxane.

[0036] Examples 9-14 A primer with ultra-high water content is prepared by the same method as in Example 1, with the only difference being that the amounts of the various components in the moisturizing agent are different. The specific details are shown in the table below.

[0037] The performance of the primer samples prepared in Examples 8-14 was tested according to the above test methods. The test results are shown in the table below.

[0038] According to the data in the table above, the primers prepared in Examples 8-14 all passed the benchmark physical and chemical performance tests. In terms of water retention and moisturizing performance, the water volatilization of these primers within 20 hours was in the range of 2.11-2.48g, which is slightly higher than that of Example 1. However, the primers of Examples 8-14 were able to increase skin moisture content to 48.3%-51.4% one hour after use, with most examples achieving skin moisture content close to or exceeding 50%, demonstrating a relatively excellent instant moisturizing effect. Although this difference is not very significant compared to the 48.2% in Example 1, it still demonstrates a certain instant moisturizing advantage.

[0039] Furthermore, eight hours after application, the primers in Examples 8-14 maintained skin moisture at 36.5%-40.4%. Although skin moisture decreased over time, overall, these primers maintained a moderate moisturizing effect for an extended period. However, compared to Example 1, the moisturizing durability of Examples 8-14 was slightly insufficient. This further demonstrates that the optimal moisturizing performance of the primer is achieved when the moisturizer is a combination of glycerin, 1,3-propylene glycol / caprylyl glycol / ethylhexylglycerin, and butylene glycol, and the emulsifier is cetyl PEG / PPG-10 / 1 polydimethicone.

[0040] Comparative Example 1 A primer with ultra-high water content is prepared by the same method as in Example 1, with the only difference being that the synthetic wax, one of its components, is a branched-chain synthetic wax having a melting point of 85°C.

[0041] Comparative Example 2 A primer with ultra-high water content is prepared by the same method as in Example 1, with the only difference being that the synthetic wax, one of its components, is a cyclic synthetic wax with a melting point of 85°C.

[0042] Comparative Example 3 A primer with ultra-high water content is prepared by the same method as in Example 1, with the only difference being that the synthetic wax, one of its components, is a linear synthetic wax with a melting point of 90°C.

[0043] Comparative Example 4 A primer with ultra-high water content is prepared by the same method as in Example 1, with the only difference being that the viscosity specification of polydimethylsiloxane, one of its components, is 1500 cst.

[0044] Comparative Example 5 A primer with ultra-high water content is prepared by the same method as in Example 1, with the only difference being that the viscosity specification of polydimethylsiloxane, one of its components, is 500 cst.

[0045] Comparative Examples 6-7 A primer with ultra-high water content is prepared by a method substantially the same as in Example 1, the only difference being that the mass ratio of synthetic wax to polydimethylsiloxane in the formula is different. The specific details are shown in the table below.

[0046] The performance tests of the primer samples prepared in Comparative Examples 1-7 were performed according to the above test methods. The test results are shown in the table below.

[0047] Compared to Example 1, the primer products prepared in Comparative Examples 1-7 showed significant differences in physical and chemical properties and moisturizing performance. Comparative Example 1 used a branched synthetic wax, which had irregular molecular chain arrangement and poor stability, failing the heat resistance, cold resistance, and hot and cold cycle tests. Comparative Example 2 used a cyclic synthetic wax, which had a relatively low melting point. Although it passed the cold resistance test, it failed the heat resistance and hot and cold cycle tests, indicating that it was unable to cope with large temperature fluctuations. One hour after use, the skin moisture content of Comparative Examples 1 and 2 was relatively high, at 40.6% and 40.4%, respectively, though not significantly different from the other comparative examples. One hour after use, the skin moisture content of Comparative Example 7 was the lowest, at 32.8%, indicating weak immediate moisturizing effect. Eight hours after use, although the skin moisture content of Comparative Example 1 was the highest, at 35.8%, this high water evaporation suggests that this moisturizing effect was only short-term, with rapid water loss. Eight hours after use, the skin moisture content of Comparative Example 7 was the lowest, at 31.5%, indicating poor long-term moisturizing effect. Comparative Examples 3 and 4 performed well in the heat resistance and cold resistance tests, but failed the hot and cold cycle test; Comparative Example 5 failed both the heat resistance and cold resistance tests due to the use of low-viscosity polydimethylsiloxane, and its stability deteriorated when the temperature changed. Comparative Examples 6 and 7 passed the heat resistance, cold resistance, and hot and cold cycle tests, and their formula stability was excellent, but both had high water volatilization rates, and their water retention and moisturizing properties were probably inferior to those of Example 1.

[0048] In general, the key performances of the comparative examples are different from those of Example 1, which fully demonstrates that different ingredient selections and ratios have a significant impact on the performance of primers.

[0049] The above are all modifications that a person skilled in the art can make to this embodiment as needed after reading this specification, which do not contribute creatively or solutions that obviously constitute technical inspiration. However, as long as they are within the scope of the claims of this application, they should be protected by patent law.

Claims

1. A makeup base cream with ultra-high water content, characterized in that: According to weight percentage, it comprises the following components: Water 75-80%, emulsifier 0.5-1%, polydimethylsiloxane 1-10%, isononyl isononanoate 1-10%, synthetic wax 1-10%, microcrystalline wax 0.5-1%, humectant 1-30%, stabilizer 0.5-1%; The synthetic wax is a linear structured synthetic wax with a melting point ranging from 84°C to 87°C; the viscosity specification of the polydimethylsiloxane is 1000 cst; and the mass ratio of the synthetic wax to the polydimethylsiloxane in the formula is 1:

3.

2. The primer with ultra-high water content according to claim 1, characterized in that: The emulsifier is cetyl PEG / PPG-10 / 1 polydimethylsiloxane.

3. The primer with ultra-high water content according to claim 1, characterized in that: The moisturizing agent is selected from one or more of glycerin, 1,3-propylene glycol / caprylyl glycol / ethylhexylglycerin, and butylene glycol.

4. The primer with ultra-high water content according to claim 3, characterized in that: The moisturizing agent consists of 1-10% glycerin, 1-10% 1,3-propylene glycol / caprylyl glycol / ethylhexylglycerin, and 1-10% butylene glycol.

5. The primer with ultra-high water content according to claim 1, characterized in that: The isomerization degree of the microcrystalline wax is 100%.

6. The primer with ultra-high water content according to claim 1, characterized in that: The stabilizer is sodium chloride.

7. The method for preparing the primer with ultra-high water content according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Mixing synthetic wax, emulsifier, polydimethylsiloxane, isononyl isononanoate, and microcrystalline wax and heating to 90° C. until dissolved to obtain an external phase; S2, mixing water, a humectant, and a stabilizer and heating to 80° C. until dissolved to obtain an inner phase; S3, adding the internal phase mixed in S2 to the external phase mixed in S1, and emulsifying into a uniform material; S4. Prepare the corresponding mold, pour the dissolved material into the mold, wait for it to solidify and form, prepare the corresponding packaging material, and wait until the material is completely cooled and formed.

8. The method for preparing a primer with ultra-high water content according to claim 7, characterized in that: The temperature for solidification molding in step S4 is 22-25°C, and the temperature for cooling molding is 16-18°C.

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