Solid-gel mask and preparation method thereof

Abstract

The invention discloses a solid-gel mask and a preparation method thereof, and belongs to the technical field of cosmetics, and the solid-gel mask comprises mask base cloth, essence and soak solution. The mask body is made of a biodegradable material, through electron beam irradiation grafting modification treatment, the surface groups and the structure of the mask material are changed, and then the water-retaining property of the mask is improved. The essence is not added with surfactants, preservatives and other components which may cause skin problems, is safe and non-irritant, has no toxic or side effect, and is suitable for any skin types including sensitive skin. According to the facial mask, moisturizing, soothing and other effective components in the facial mask are effectively stored in the facial mask through a freeze-drying process, the preservation safety of the facial mask is greatly improved, the preservation time of the facial mask is greatly prolonged in a liquid-free environment, and therefore the use effect of the facial mask is improved.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a solid-gel mask and its preparation method. Background Technology

[0002] Skincare products have developed rapidly with economic growth, and facial masks are among the most popular. Sheet masks dominate the market due to their advantages such as quick skincare and portability. According to the QB / T-2872-2017 standard, facial masks can be categorized by their form into cream / lotion masks, gel masks, sheet masks, and powder masks. Traditional sheet masks on the market consist of a mask base and an essence. The mask base is soaked in a beauty essence composed of various surfactants, preservatives, film-forming agents, and active ingredients. While the antibacterial agents and preservatives added to cosmetics can effectively inhibit the growth of microorganisms, they may also disrupt or inhibit the resident microbial community on the skin during use, thereby disturbing the skin's microecological balance, inducing various skin problems, posing a potential threat to skin health, and causing skin irritation. Furthermore, sheet masks often result in wasted essence.

[0003] The base material of sheet masks is mainly cellulose. Cellulose is the most abundant natural polymer compound in the world and a component of plant cell walls. As a renewable resource, it is widely available, environmentally friendly, and non-toxic to the human body. Therefore, it can be used as a base material for sheet masks, which aligns with the concept of green and sustainable development. Electron beam irradiation technology is an energy-saving, pollution-free processing technique that can be carried out at room temperature and has simple process control. Electron beam irradiation treats cellulose, modifying the fiber surface through graft copolymerization. This alters the fiber structure and increases the number of water-absorbing groups, thereby giving the mask a super absorbent capacity and improving its water retention.

[0004] Patent CN108743456A discloses a preservative-free irradiated face mask and its preparation method. The method involves irradiating a face mask containing essence, but this cannot avoid the effect of irradiation on the essence. Moreover, this invention is still a traditional face mask, and the essence still contains thickeners, emulsifiers, and other ingredients that pose potential risks to the skin, thus retaining many of the shortcomings of traditional face masks.

[0005] Cellulose, after being processed to absorb water, forms a natural hydrogel. Through physical and crystal cross-linking, it creates a gel network that slowly decomposes and releases the essence during use. There is no evaporation or back-absorption. Furthermore, the hydrogel adheres well to the skin, doesn't easily fall off, and provides long-lasting absorption with a high absorption rate. Hydrogel masks contain a large number of water molecules, offering a level of moisturizing that traditional masks cannot achieve.

[0006] Freeze-dried masks are produced by rapidly freezing the water in a mask using a freeze-drying process, then sublimating it into a gaseous state under vacuum conditions. This process dehydrates the mask while retaining its original active ingredients, resulting in a solid, dry mask. CN202010470269.1 discloses a mask essence and a freeze-dried crystal mask containing the mask essence. This invention only freeze-dries the mask and its essence, without making any innovative innovations to the mask's base material.

[0007] The present invention aims to solve the above problems by inventing a face mask that is free of surfactants, preservatives, and irritants, is solid-dry, easy to carry, can be effectively preserved for a long time, has significant effects, and has the comfort of hydrogel. Summary of the Invention

[0008] The purpose of this invention is to provide a solid-gel facial mask and its preparation method. The solid-gel facial mask of this invention is solid when prepared, and transforms into a hydrogel state upon soaking during use.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a solid-gel facial mask. The mask body is made of a biodegradable material, and the super-absorbent mask base fabric is obtained through electron beam irradiation grafting modification. The mask essence is free of surfactants, preservatives, and bactericides. The mask utilizes a freeze-drying process to preserve the moisturizing, soothing, and other effective ingredients within the mask for a long period.

[0010] A method for preparing a solid-gel facial mask includes the following steps: (1) The mask base fabric is grafted with electron beam irradiation to make a super absorbent mask substrate; (2) Prepare the essence, which, by weight percentage, consists of: 0.1% to 5% polyol, 0.1% to 5% moisturizer, 0% to 3% other ingredients, and the remainder is deionized water; (3) After fully immersing the mask substrate in step (1) in the essence in step (2), freeze-dry it to make a solid mask.

[0011] Preferably, the mask base fabric is one or more of cotton fiber, silk fiber, viscose fiber, Tencel fiber, and cupro fiber.

[0012] Preferably, in step (1), the irradiation voltage during electron beam irradiation is 100 KeV ~ 160 KeV, and the irradiation dose is 10 kGy ~ 50 kGy.

[0013] Further, in step (2), the polyol is one or more of butanediol, propylene glycol, pentanediol, and hexanediol. Preferably, the polyol is one or more of 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, 1,3-propanediol, 1,2-propanediol, 1,2-pentanediol, 1,5-pentanediol, 1,2-hexanediol, and 1,6-hexanediol. The moisturizer is one or more of glycerin, sodium hyaluronate, ethylhexylglycerin, dipropylene glycol, and squalane. Other ingredients are one or more of panthenol, trehalose, nicotinamide, carnosine, and aloe vera leaf juice.

[0014] Preferably, in step (2), 0.2~2.5g of mask base fabric is soaked in 6~20mL of essence.

[0015] Preferably, in step (3), the freeze-drying temperature is -30℃ to -60℃ and the freezing time is 24h to 48h.

[0016] The solid-gel mask prepared by the above method.

[0017] Preferably, the solid-gel mask prepared by the present invention is soaked in 4-20 mL of soaking solution at room temperature for 1-10 min when used, depending on the needs of use.

[0018] Preferably, the solid mask soaking solution is one or more of purified water, rose water, and aloe vera leaf water.

[0019] The beneficial effects of this invention are: 1. The mask base fabric included in this invention uses an electron beam irradiation method to change its structural properties. By bombarding the cellulose material of the mask fabric with an electron beam, highly active intermediates such as free radicals are generated. The modified grafting gives the material surface a super strong adsorption capacity, thereby improving the absorption rate of the mask. After the mask base fabric absorbs water and swells, it becomes gel-like and will not separate, thus achieving the super moisturizing ability of the mask.

[0020] 2. The essence contained in this invention does not contain any surfactants, preservatives, bactericides, or other skin-irritating ingredients, thus reducing the risk of skin allergies, inflammation, and other adverse reactions caused by face masks.

[0021] 3. The process technology included in this invention employs freeze-drying technology to transform liquid masks, which are difficult to preserve, into solid masks. This not only improves the shelf life of the mask but also effectively preserves the active ingredients of the essence, thereby enhancing the mask's efficacy. The solid form is foldable and easy to carry.

[0022] 4. The solid mask included in this invention allows users to select different soaking solutions and soaking times according to their preferences, resulting in varying degrees of natural hydrogel state after soaking, achieving long-lasting hydration. The ingredients are safe, and the mask has a gentle and comfortable feel on the skin. Attached Figure Description

[0023] Figure 1 The results of the heat resistance and cold resistance tests of the mask of this invention are shown. Figure 2 The results are the water retention test results of Comparative Examples 1-2 and Examples 1-5. Detailed Implementation

[0024] The present invention will be further described below with reference to some specific embodiments, but the implementation of the present invention is not limited thereto.

[0025] The present invention includes a solid-gel facial mask, comprising the following methods for its manufacture, processing, and use: A fiber mask base fabric with an area of ​​11cm × 9cm, a thickness of 0.05~0.18mm, and a weight of 0.2~0.9g is modified by electron beam irradiation at a voltage of 100 keV~160 keV and a dose of 10 kGy~50 kGy. After irradiation, it is fully immersed in 6~20mL of essence, and then placed in a low-temperature freeze dryer at a temperature of -30℃~-60℃ for 28h~48h. After freeze-drying, the dried solid mask is immersed in 4~20mL of purified water or rose water at room temperature and left to stand for 1~10 minutes to obtain the final product.

[0026] Example 1 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of Tencel fiber. The essence, by weight percentage, comprises: 2% glycerin, 1% 1,4-butanediol, 0.15% sodium hyaluronate, and the remainder being deionized water. The soaking solution is purified water.

[0027] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 110 keV and a dose of 10 kGy. S2. After irradiation, soak thoroughly in 6mL of essence; S3. Then place it in a low-temperature freeze dryer at -50°C for 30 hours.

[0028] S4. After freeze-drying, at room temperature, immerse the dried solid mask in 6 mL of soaking solution and let it stand for 1 minute to obtain the final product.

[0029] Example 2 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of viscose fiber. The essence, by weight percentage, comprises: 2% glycerin, 1% 1,3-propanediol, 0.1% sodium hyaluronate, and the remainder being deionized water. The soaking solution is purified water.

[0030] The preparation process includes the following steps: S1. Modify the fiber mask base fabric by electron beam irradiation with an irradiation voltage of 120 keV and a dose of 20 kGy. S2. After irradiation, soak thoroughly in 8mL of essence; S3. Then place it in a low-temperature freeze dryer at -50°C for 30 hours.

[0031] S4. After freeze-drying, at room temperature, soak the dried solid mask in 8 mL of soaking solution and let it stand for 2 minutes to obtain the final product.

[0032] Example 3 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of viscose fiber. The essence, by weight percentage, comprises: 1.5% glycerin, 1.5% 1,4-butanediol, 0.3% trehalose, and the remainder being deionized water. The soaking solution is purified water.

[0033] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 130 keV and a dose of 30 kGy. S2. After irradiation, soak thoroughly in 10mL of essence; S3. Then place it in a low-temperature freeze dryer at -50°C for 30 hours.

[0034] S4. After freeze-drying, at room temperature, soak the dried solid mask in 10mL of soaking solution and let it stand for 4 minutes to obtain the final product.

[0035] Example 4 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of Tencel fiber. The essence, by weight percentage, comprises: 1.5% glycerin, 1.5% 1,3-propanediol, 0.1% sodium hyaluronate, 1% panthenol, and the remainder being deionized water. The soaking solution is purified water.

[0036] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 140 keV and a dose of 40 kGy. S2. After irradiation, soak thoroughly in 8mL of essence; S3. Then place it in a low-temperature freeze dryer at -50°C for 35 hours.

[0037] S4. After freeze-drying, at room temperature, soak the dried solid mask in 8 mL of soaking solution and let it stand for 2 minutes to obtain the final product.

[0038] Example 5 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of Tencel fiber. The essence, by weight percentage, comprises: 2% glycerin, 1% 1,4-butanediol, 0.15% sodium hyaluronate, and the remainder being deionized water. The soaking solution is purified water.

[0039] The preparation process includes the following steps: S1. Modify the fiber mask base fabric by electron beam irradiation with an irradiation voltage of 150 keV and a dose of 50 kGy. S2. After irradiation, soak thoroughly in 10mL of essence; S3. Then place it in a low-temperature freeze dryer at -50°C for 35 hours.

[0040] S4. After freeze-drying, at room temperature, soak the dried solid mask in 10mL of purified water and let it stand for 4 minutes to obtain the final product.

[0041] Example 6 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of viscose fiber. The essence, by weight percentage, comprises: 2% glycerin, 1% 1,3-propanediol, 0.1% sodium hyaluronate, and the remainder being deionized water. The soaking solution is rose water.

[0042] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 140 keV and a dose of 30 kGy. S2. After irradiation, soak thoroughly in 6mL of essence; S3. Then place it in a low-temperature freeze dryer at -40℃ for 40 hours.

[0043] S4. After freeze-drying, at room temperature, immerse the dried solid mask in 6 mL of soaking solution and let it stand for 1 minute to obtain the final product.

[0044] Example 7 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of viscose fiber. The essence, by weight percentage, comprises: 1.5% glycerin, 1.5% 1,4-butanediol, 0.3% trehalose, and the remainder being deionized water. The soaking solution is purified water.

[0045] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 140 keV and a dose of 30 kGy. S2. After irradiation, soak thoroughly in 8mL of essence; S3. Then place it in a low-temperature freeze dryer at -40℃ for 40 hours.

[0046] S4. After freeze-drying, at room temperature, soak the dried solid mask in 8 mL of soaking solution and let it stand for 2 minutes to obtain the final product.

[0047] Example 8 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of Tencel fiber. The essence, by weight percentage, comprises: 1.5% glycerin, 1.5% 1,3-propanediol, 0.1% sodium hyaluronate, 1% panthenol, and the remainder being deionized water. The soaking solution is rose water.

[0048] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 150 keV and a dose of 40 kGy. S2. After irradiation, soak thoroughly in 6mL of essence; S3. Then place it in a low-temperature freeze dryer at -45°C for 35 hours.

[0049] S4. After freeze-drying, at room temperature, immerse the dried solid mask in 6 mL of soaking solution and let it stand for 1 minute to obtain the final product.

[0050] Example 9 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of Tencel fiber. The essence, by weight percentage, comprises: 1.5% glycerin, 1.5% 1,3-propanediol, 0.2% trehalose, and the remainder being deionized water. The soaking solution is purified water.

[0051] The preparation process includes the following steps: S1. The fiber mask base fabric is modified by electron beam irradiation with an irradiation voltage of 150 keV and a dose of 40 kGy. S2. After irradiation, soak thoroughly in 8mL of essence; S3. Then place it in a low-temperature freeze dryer at -45°C for 35 hours.

[0052] S4. After freeze-drying, at room temperature, soak the dried solid mask in 8 mL of soaking solution and let it stand for 2 minutes to obtain the final product.

[0053] Comparative Example 1 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of Tencel fiber. The essence, by weight percentage, comprises: 2% glycerin, 1% 1,4-butanediol, 0.1% sodium hyaluronate, and the remainder being deionized water. The soaking solution is purified water.

[0054] The preparation process includes the following steps: S1. The mask base sheet is fully soaked in 8mL of essence; S2. Then place it in a low-temperature freeze dryer at -50°C for 30 hours.

[0055] S3. After freeze-drying, at room temperature, immerse the dried solid mask in 8 mL of soaking solution and let it stand for 2 minutes to obtain the final product.

[0056] Comparative Example 2 A solid-gel facial mask includes a mask base fabric, an essence, and an soaking solution. The mask base fabric is made of viscose fiber. The essence, by weight percentage, comprises 1.5% glycerin, 1% 1,3-propanediol, 0.1% sodium hyaluronate, and the remainder being deionized water. The soaking solution is purified water.

[0057] The preparation process includes the following steps: S1. The mask base sheet is fully soaked in 8mL of essence; S2. Then place it in a low-temperature freeze dryer at -50°C for 30 hours.

[0058] S3. After freeze-drying, at room temperature, immerse the dried solid mask in 8 mL of soaking solution and let it stand for 2 minutes to obtain the final product.

[0059] The above embodiments and comparative examples were tested, and the experimental content, methods, and results are as follows: Physicochemical index testing Heat resistance test According to the facial mask standard QB-T 2872-2017, the prepared solid facial mask was packaged in a self-sealing bag and placed in a constant temperature incubator at 40±1℃. After 24 hours, the mask was taken out and observed for any obvious changes.

[0060] The test results showed no significant change in the face mask. Figure 1The experimental results of Example 5 demonstrate that the heat resistance of the mask involved in this invention meets the standards.

[0061] Cold resistance test According to the facial mask standard QB-T 2872-2017, the prepared solid facial mask was packaged in a self-sealing bag and placed in a constant temperature incubator at -8±2℃. After 24 hours, the mask was taken out and observed for any obvious changes.

[0062] The test results showed no significant change in the face mask. Figure 1 The experimental results of Example 5 demonstrate that the cold resistance of the mask involved in this invention meets the standards.

[0063] test The serum test results were between 3.5 and 8.5, and the mask test results were between 3.5 and 8.5, both conforming to standard QB-T2872-2017.

[0064] Liquid carryover rate test The freeze-dried solid masks prepared in the examples and comparative examples were humidified and weighed. Immerse the samples in a sealed petri dish containing 10 mL of deionized water for 5 minutes. Then, suspend the samples vertically in sequence for 120 ± 3 seconds, remove excess liquid, and weigh them again. Formula for calculating liquid carryover rate: 𝐿𝐴𝐶: Liquid carrying rate; : Dry weight of the sample after humidification; Weight of the sample after it has been soaked and suspended vertically for 120±3 seconds.

[0065] L1 to L7 represent Comparative Examples 1 to 2 and Examples 1 to 5, respectively.

[0066] Table 1 As shown in Table 1, the initial liquid carrying rate of the experimental group increased with the increase of electron beam irradiation dose. When the irradiation conditions reached an irradiation voltage of 150 keV and a dose of 50 kGy, the initial liquid carrying rates of the experimental group and the control group reached the same range within 120 ± 3 s.

[0067] Water retention test The water retention of a face mask refers to how effectively the mask base can lock in the essence as the application time increases, slowing down the evaporation of the essence and keeping the mask base moist to prevent it from drying out and drawing moisture from the skin.

[0068] The testing method and calculation formula are the same as those for the liquid retention rate test, but the testing time is different. For the water retention test, the weight of the mask base fabric is measured every 10 minutes for a total of 120 minutes.

[0069] L1 to L7 represent Comparative Examples 1 to 2 and Examples 1 to 5, respectively.

[0070] Depend on Figure 2 It can be seen that, compared with Examples 1-5, the water absorbed by Comparative Examples 1-2 evaporates faster. At around 80-100 minutes, the control group contains almost no water, and almost all of the water it contains evaporates, while the experimental group still retains some water after 120 minutes.

[0071] Examples 1-5 show that, with the same material, as the degree of irradiation increases, the water retention rate of the mask increases, the water retention capacity increases, which can slow down the volatilization of the mask's effective ingredients and maintain the moisture of the mask base fabric for a long time.

[0072] In summary, the solid-gel mask provided by this invention has the physicochemical properties to withstand high temperature (40±1℃) and low temperature (-8±2℃) environments, which slows down the volatilization of the active ingredients in the mask, maintains the mask's moisture state for a long time, achieves ultra-long-lasting water retention and locking, and thus enhances the mask's effect.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a solid-gel mask, characterized in that, Includes the following steps: (1) The mask base fabric is grafted with electron beam irradiation to make a super absorbent mask substrate; (2) Prepare the essence, which, by weight percentage, consists of: 0.1% to 5% polyol, 0.1% to 5% moisturizer, 0% to 3% other ingredients, and the remainder is deionized water; (3) After fully immersing the mask substrate in step (1) in the essence in step (2), freeze-dry it to make a solid mask.

2. The method for preparing a solid-gel mask according to claim 1, characterized in that, The mask base fabric is one or more of cotton fiber, silk fiber, viscose fiber, Tencel fiber, and cupro fiber.

3. The solid-gel mask and its preparation method according to claim 1, characterized in that, In step (1), the irradiation voltage during electron beam irradiation is 100 KeV ~ 160 KeV, and the irradiation dose is 10 kGy ~ 50 kGy.

4. The solid-gel mask and its preparation method according to claim 1, characterized in that, In step (2), the polyol is one or more of butylene glycol, propylene glycol, pentane glycol and hexanediol, the moisturizer is one or more of glycerin, sodium hyaluronate, ethylhexylglycerin, dipropylene glycol and squalane, and the other ingredients are one or more of panthenol, trehalose, nicotinamide, carnosine and aloe vera leaf juice.

5. The solid-gel mask and its preparation method according to claim 1, characterized in that, In step (2), 0.2~2.5g of mask base fabric is soaked in 6~20mL of essence.

6. The solid-gel mask and its preparation method according to claim 1, characterized in that, In step (3), the freeze-drying temperature is -30℃ to -60℃, and the freezing time is 24h to 48h.

7. A solid-gel mask prepared by the preparation method according to any one of claims 1 to 6.

8. The solid-gel mask according to claim 7, characterized in that, When using the solid-gel mask, soak it in 4-20 mL of soaking solution for 1-10 minutes.

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