Preparation method of a solid instant facial mask without a base material and a facial mask thereof

Abstract

The application provides a preparation method of a substrate-free solid instant facial mask, comprising the following steps: S1, taking a natural high molecular material, stirring and dispersing to prepare a facial mask base solution; S2, performing molecular degradation treatment and film strengthening treatment on the facial mask base solution obtained in the step S1; S3, adding a humectant, a surfactant and a biological efficacy component into the facial mask base solution, and stirring to obtain a facial mask film forming solution; and S4, drying and shaping the facial mask film forming solution obtained in the step S3 to obtain a solid instant facial mask. The solid instant facial mask prepared by the method does not contain a similar substrate structure in a traditional facial mask, so that no waste is generated during use, the environment is friendly, and the use is more convenient and easier to absorb. The application further provides a solid instant facial mask.

Description

Technical Field

[0001] This invention relates to the field of solid mask preparation technology, specifically to a substrate-free solid instant-dissolving mask preparation method and the mask thereof. Background Technology

[0002] Facial masks are important functional cosmetics for facial skin care. The ordinary sheet masks that account for 70% of the market are mainly made of spunlace nonwoven fabric as the base fabric, and the materials are mainly pure cotton and regenerated cellulose fibers. When using them, there are the following problems: (1) The mask sheet does not fit the skin or the size is not suitable. There are defects in the essence penetration, breathability and thickness of the mask sheet; (2) The essence cannot be fully absorbed, the essence is unevenly distributed, it is slippery, not moisturizing enough and easy to lose; (3) Wet mask products contain preservatives and other substances. Preservatives may be allergens and are not friendly to sensitive skin, pregnant women and other special groups; (4) The transdermal absorption capacity of active substances in this type of mask is uncertain. More active substances have the disadvantages of being easy to change and difficult to preserve; (5) The use time is long, ranging from 15 to 30 minutes, which is less efficient for busy working women. With the fast pace of life and societal demands on women's multifaceted roles, consumers not only expect better absorption of face masks, but also increasingly demand convenience and safety. Shorter usage time, fewer steps, time savings, and the absence of preservatives have become key areas for value-added innovation in face mask products. Existing solid, instant-dissolving face masks can address these issues to some extent. They are safe, preservative-free, dissolve quickly in water, are easy to use, and require no rinsing after use, making them readily accepted by consumers and possessing broad application prospects.

[0003] Currently, the preparation method of solid instant-dissolving facial masks mostly adopts electrospinning. Electrospinning is a special method of electrostatic atomization of polymer fluids, and the prepared facial masks have properties such as nano-size, high specific surface area, and high surface activity. Chinese Patent 201910053466.0 prepares a collagen nano-instant-dissolving facial mask with budding short-stalk enzyme polysaccharide as the backbone, including a non-woven fabric substrate layer and a nanofiber layer. The spinning solution is prepared using budding short-stalk enzyme polysaccharide, hydrolyzed collagen (different molecular weights), polyglutamic acid, etc., and the spun film is prepared by electrospinning and received on the non-woven fabric substrate layer. The resulting facial mask material is water-soluble and has a good wrinkle-removing effect. Chinese Patent 202110372668.9 uses a solution of silk fibroin, sodium hyaluronate, budding short-stalk enzyme, etc., to form densely distributed nanofibers by electrospinning, and uses aluminum foil as the substrate to receive the electrospun film to prepare a solid facial mask.

[0004] However, the electrospinning process is complex, and because electrospinned membranes lack internal chemical bonds, their strength is often poor. Additional non-woven fabrics or padding materials are needed to receive the electrospinned membrane and ensure processability and usability. The mask substrate is discarded after use and cannot be reused, increasing the consumption of petroleum-based chemicals and putting pressure on the environment. Furthermore, most electrospinning methods require organic solvents; otherwise, high-quality nanofibers cannot be obtained. In addition, electrospinned membranes may suffer from high production costs, low production efficiency, poor mechanical properties, and susceptibility to breakage. Summary of the Invention

[0005] To address the technical defects and shortcomings of existing technologies, this invention provides a method for preparing a substrate-free solid instant-dissolving facial mask, comprising the following preparation steps:

[0006] Step S1: Take a certain amount of natural polymer material, stir and disperse it to prepare the mask base liquid;

[0007] Step S2: Perform molecular degradation treatment and film-forming enhancement treatment on the mask base liquid obtained in step S1;

[0008] Step S3: Add moisturizer, surfactant and bioactive components to the mask base liquid after step S2, stir for a certain time to obtain the mask film-forming liquid.

[0009] Step S4: The mask-forming liquid obtained in step S3 is formed into a film, and after drying and shaping, a substrate-free solid instant-dissolving mask is obtained.

[0010] The solid, fast-dissolving facial mask prepared according to this method uses natural polymer materials as its skeletal structure. The mask is directly formed into a film from the film-forming solution, and after drying and setting, it becomes a solid, fast-dissolving facial mask. It does not contain a substrate layer similar to a pad or sheet in existing facial masks, therefore it generates no waste during use, is environmentally friendly, and is more convenient and easily absorbed. Furthermore, because the natural polymers in the mask base solution form hydrogen bonds through chemical cross-linking, the solid, fast-dissolving facial mask prepared according to this method also has better strength and toughness. In addition, compared with existing electrospinning methods, the preparation method provided by this invention has a simpler process, lower equipment requirements, reduces production costs, and significantly improves production efficiency and product yield.

[0011] Optionally, in step S1, the stirring and dispersion time is 10-120 minutes, and the stirring and dispersion method includes ultrasonic dispersion, stirring dispersion with a stirrer, or stirring dispersion with a magnetic rotor.

[0012] Optionally, the natural polymeric material in step S1 may include one or more combinations of methylcellulose, sodium carboxymethylcellulose, starch, sodium alginate, chitosan, konjac glucomannan, and pullulan.

[0013] Preferably, in step S2, the mask base liquid obtained in step S1 is treated for a certain period of time using an ultrasonic cell disruption device at a certain power to perform molecular degradation treatment and film-forming enhancement treatment.

[0014] Optionally, the molecular degradation treatment and film-forming enhancement treatment in step S2 may be performed by acid treatment or microwave treatment.

[0015] Optionally, in step S3, the stirring time is 20-90 minutes.

[0016] Optionally, the humectant in step S3 may be one or more of the following: glycerin, hydroxyethyl urea, methyl propylene glycol, glycerin polyether-26, polyglycerol-10, D-panthenol, succinopolysaccharide, 1,3-butanediol, caprylyl glycol, PEG-400, jojoba oil, sorbitol, betaine, allantoin, and plant extracts.

[0017] Optionally, the surfactant in step S3 may be one or a combination of hydroxyethyl cellulose, polysorbate 80, polysorbate 60, and sodium dodecyl sulfate.

[0018] Optionally, the bioactive substances in step S3 include one or more of the following: purslane extract, centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptides, and sodium hyaluronate.

[0019] Optionally, the mass percentages of all components of the mask film-forming liquid after step S3 are as follows: 0.5-10% natural polymer materials, 1-25% moisturizer, 0.1-2% surfactant, and 0.05%-2% bioactive substances; wherein the ratio of moisturizer to natural polymer materials is 3.7-9.2, and the pH value of the mask film-forming liquid is 5.0-8.0.

[0020] Optionally, in step S4, the method of forming the mask film-forming liquid into a film may include casting or coating release, wherein the casting method may be a mold method or a casting machine method.

[0021] Optionally, in step S4, the drying method includes oven drying, ultrasonic heating or radiation drying, and the drying temperature is controlled between 20-80℃.

[0022] On the other hand, the present invention also provides a solid instant-dissolving facial mask prepared according to the above method.

[0023] Compared to existing face masks, solid, instant-dissolving masks use bio-based materials and a small amount of petroleum-based chemicals. They contain no base material, generate no solid waste, reduce environmental impact, and minimize essence waste. Furthermore, they do not require prolonged application; simply spray water on the face after application to dissolve and allow for absorption, effectively improving skincare efficiency and providing moisturizing and anti-aging benefits. Attached Figure Description

[0024] Figure 1 This is a flowchart of a method for preparing a substrate-free solid instant-dissolving face mask according to an embodiment of the present invention;

[0025] Figure 2 The image shows the infrared spectrum of the solid, fast-dissolving face mask prepared according to the method of the present invention.

[0026] Figure 3 This is a scanning electron microscope image of the surface of a solid instant-dissolving facial mask obtained by the preparation method of the present invention without the addition of active ingredients;

[0027] Figure 4 These are scanning electron microscope images of the surface of a solid, fast-dissolving facial mask prepared according to the method of the present invention when active ingredients are added;

[0028] Figure 5 The image shows a scanning electron microscope (SEM) image of a cross-section of a solid, fast-dissolving facial mask prepared according to the method of the present invention without the addition of active ingredients.

[0029] Figure 6 The image shows a scanning electron microscope (SEM) image of a cross-section of a solid, fast-dissolving facial mask prepared according to the method of the present invention after the addition of active ingredients. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] To make the purpose, technical solution, and advantages of this invention patent application clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below.

[0032] Figure 1 A flowchart illustrating a substrate-free solid instant facial mask preparation method according to an embodiment of the present invention is shown. (See attached diagram) Figure 1 As shown, the method for preparing a substrate-free solid instant-dissolving facial mask provided by the present invention includes the following preparation steps:

[0033] Step S1: Take a certain amount of natural polymer material, stir and disperse it to prepare the mask base liquid.

[0034] Step S2 involves subjecting the mask base obtained in step S1 to molecular degradation and film-forming strengthening treatments. The purpose of these treatments is to allow the natural polymers in the mask base to form hydrogen bonds through chemical cross-linking, resulting in a film-forming material with higher strength and toughness to meet the requirements of mask processing and use. Furthermore, the molecular weight of the natural polymers is reduced, improving the water solubility of the film-forming material. After film formation, it becomes soft, water-soluble, and adheres well to the skin, playing a positive role in skin repair and protection.

[0035] Step S3: Add moisturizer, surfactant, and bioactive components to the mask base liquid after step S2, and stir for a certain period of time to obtain the mask film-forming liquid.

[0036] Step S4: The mask-forming liquid obtained in step S3 is formed into a film, and after drying and shaping, a substrate-free solid instant-dissolving mask is obtained.

[0037] The solid, quick-dissolving facial mask prepared according to this method uses natural polymer materials as its skeletal structure. The mask-forming solution is directly molded into a film, which is then dried and set to form a solid, quick-dissolving facial mask. It does not contain a substrate layer similar to a pad or sheet in existing facial masks, therefore it generates no waste during use, is environmentally friendly, and is more convenient and easily absorbed. Furthermore, because the natural polymers in the mask base solution form hydrogen bonds through chemical cross-linking, the solid, quick-dissolving facial mask prepared according to this method also has better strength and toughness. In addition, compared with the electrospinning method used in the prior art for preparing solid facial masks, the preparation method provided by this invention has a simpler process, lower equipment requirements, reduces production costs, and significantly improves production efficiency and product yield.

[0038] Specifically, in one embodiment of the present invention, in step S1, a certain amount of natural polymer materials, such as sodium alginate and starch, are taken and stirred and dispersed for 10-120 minutes to prepare a mask base liquid. The stirring and dispersing methods include ultrasonic dispersion, stirring dispersion with a stirrer or magnetic rotor stirring dispersion.

[0039] The natural polymeric material in step S1 may include one or more combinations of methylcellulose, sodium carboxymethylcellulose, starch, sodium alginate, chitosan, konjac glucomannan, and pullulan.

[0040] In one embodiment of the present invention, in step S3, the moisturizer, surfactant, and bioactive components are mixed with the mask base liquid treated in step S2 in a certain proportion and stirred for 20-90 minutes to form a mask film-forming liquid.

[0041] In one embodiment of the present invention, in step S2, the mask base liquid obtained in step S1 is treated for a certain period of time using an ultrasonic cell disruption device at a certain power to perform molecular degradation and film-forming enhancement treatment. The energy generated by the cavitation effect of ultrasound forces the liquid to flow and generate pressure, and promotes the formation of cavitation bubbles. The energy absorbed by the cavitation bubbles is released in a very short time, forming a high-temperature and high-pressure environment. This cavitation effect accelerates particle movement, destroys the particle crystal structure, and increases molecular reactivity in the subsequent film-forming reaction, thereby improving the strength of the membrane material. At the same time, ultrasonic treatment will accelerate molecular degradation, reduce molecular weight and particle size, and improve the water solubility of the membrane material.

[0042] By analyzing the structure of the membrane material using Fourier transform infrared spectroscopy (FT-IR), it can be found that the membrane formed by natural polymer materials has a stable structure formed through hydrogen bonds. Figure 2 These are infrared spectra of solid, fast-dissolving facial masks prepared according to the method of this invention. Curve (a) shows the spectrum of a film formed by combining natural polymer materials without molecular degradation treatment with active ingredients. Curve (b) shows the spectrum of a film formed by combining natural polymer materials with moisturizing substances such as hyaluronic acid after molecular degradation treatment. Curve (c) shows the spectrum of a film formed by combining natural polymer materials with active ingredients such as hydrolyzed collagen peptides after molecular degradation treatment. Curve (a) shows that the characteristic peaks of the undegraded membrane material are obvious, indicating that the functional groups of the polymer materials were not destroyed during film formation and still exist in the membrane material. Curves (b) and (c) show that the intensity of the characteristic peaks of the functional groups of the natural polymer materials is significantly weakened after molecular degradation treatment, indicating that molecular degradation treatment partially destroys the original groups of the polymer materials. Furthermore, no new characteristic peaks appear, indicating that no new chemical bonds are formed after film formation, and a stable structure is formed inside the membrane material through hydrogen bonds.

[0043] Figure 3 and Figure 5 The images shown are scanning electron microscope (SEM) images of the surface and cross-section of the solid instant-dissolving face mask prepared according to the method of the present invention without the addition of active ingredients. The SEM images show that the surface of the film is flat and smooth, indicating that the surface flatness of the film material is good. Therefore, the hydroxyl groups of the natural polymer material form hydrogen bonds inside the film, thereby obtaining a stable film structure.

[0044] Figure 4 and Figure 6The images show the results of scanning electron microscopy (SEM) observations of the surface and cross-section of a mask formulated with hyaluronic acid and other active ingredients. The images show that the mask surface remains smooth and even, but some wrinkles and small particles are present. This is because the addition of moisturizing substances enhances the hygroscopicity of the membrane material, increasing its water content and softness. The cross-sectional image shows a film thickness of approximately 50 μm, and that the film is uniform and dense, indicating that the film-forming substances and active ingredients have formed a stable and uniform composite film through a chemical cross-linking reaction.

[0045] In other embodiments of the present invention, acid treatment and microwave treatment under appropriate conditions can achieve the purpose of molecular degradation treatment and film-forming enhancement treatment in step S2.

[0046] In step S4 of the above preparation method, the method for forming the film-forming liquid into a film can include casting or coating release. Casting can be implemented using two specific methods: mold casting and casting machine casting. Mold casting involves pouring the film-forming liquid into a mold, and adjusting the quantitative, thickness, and uniformity of the finished film based on factors such as the concentration and amount of the film-forming liquid. The mold must have a certain depth and shape. Casting machine casting refers to injecting the film-forming liquid into a casting machine for casting, also known as belt casting or doctor blade casting. The film-forming liquid flows from the bottom of the hopper onto a forward-moving film carrier (such as cellulose acetate, polyester, polypropylene, polytetrafluoroethylene, steel belt, etc.), and the film thickness is controlled by the height of the doctor blade. After drying, the film is formed. The coating release method involves coating a film-forming liquid onto release paper. After drying, the finished mask is peeled off from the release paper and wound up separately. The release paper can be reused. By controlling factors such as the concentration of the film-forming liquid, the type of the yarn, the pressure of the yarn, and the coating speed, the amount of adhesive applied can be controlled, thereby regulating parameters such as the quality and thickness of the mask product.

[0047] Drying and shaping methods can include oven drying (vacuum drying, low-temperature drying), ultrasonic heating, radiation drying, etc., with the temperature controlled between 20-80℃, to obtain a solid, quick-dissolving face mask.

[0048] In this invention, the thickness of the solid mask obtained according to the above preparation method can be flexibly determined based on user needs and is not limited by the preparation conditions in the prior art. However, after multiple experiments by the R&D personnel, considering both user experience and mask absorbency, the mask thickness is best determined to be between 40-1000 μm. When using a mask, users prefer a thin mask that dissolves easily after spraying water to improve skincare efficiency; therefore, the mask needs to be relatively thin. However, if the mask is too thin, it will inevitably reduce the amount of effective skincare substances added, weakening its efficacy. In addition, for masks that are too thin, the process of applying them to the face becomes difficult due to the lack of a backing or other substrate, affecting the user experience.

[0049] Specifically, the moisturizer in step S3 may be one or more of the following: glycerin, hydroxyethyl urea, methyl propylene glycol, glycerin polyether-26, polyglycerol-10, D-panthenol, succinopolysaccharide, 1,3-butanediol, caprylyl glycol, PEG-400, jojoba oil, sorbitol, betaine, allantoin, and plant extracts.

[0050] In one embodiment of the present invention, the surfactant may be one or a combination of hydroxyethyl cellulose, polysorbate 80, polysorbate 60, and sodium dodecyl sulfate.

[0051] In one embodiment of the present invention, the bioactive substances include one or more of the following: purslane extract, centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptides, and sodium hyaluronate.

[0052] Natural polymers need to be compatible with the moisturizers, surfactants, and bioactive substances added to the mask base, and must not compromise the effectiveness of the active ingredients. Therefore, optimized selection is necessary. In one embodiment of the present invention, the mass percentages of all components in the mask film-forming liquid after step S3 are as follows: natural polymer 0.5-10%, moisturizer 1-25%, surfactant 0.1-2%, and bioactive substances 0.05%-5%. The ratio of moisturizer to natural polymer is between 3.7 and 9.2, and the pH value of the mask film-forming liquid is 5.0-8.0. This ratio of moisturizer to natural polymer ensures both the film-forming properties of the mask and the amount of moisturizing substances added, thus ensuring the mask's usability.

[0053] In one embodiment of the present invention, the components added in step S3 further include an acid-base regulator. The acid-base regulator includes an acidic regulator and / or an alkaline regulator. The acidic regulator may be one or a combination of several selected from citric acid, phosphoric acid, tartaric acid, and sodium dihydrogen phosphate. The alkaline regulator may be one or a combination of several selected from diethanolamine, triethanolamine, sodium hydroxide, sodium carbonate, and sodium bicarbonate.

[0054] In one embodiment of the present invention, the mass percentage of pH adjuster in the mask film-forming solution after step S3 is 0.005-0.2%.

[0055] The solid, quick-dissolving facial mask prepared according to the method provided by this invention can be used as a cosmetic for beauty care on multiple areas such as the face, eyes, and neck. This mask has a certain shape, tensile strength, and elasticity. After being sprayed with water, it transforms into a liquid that is absorbed by the skin, providing excellent skin adhesion and a pleasant feel as a beauty mask. The active ingredients are one or more of the following: purslane extract, centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptides, and sodium hyaluronate. Their inclusion can better protect skin cells. These ingredients can penetrate deep into the skin to replenish moisture, enhance skin hydration, delay skin aging, protect the skin from external stimuli, soothe and moisturize, resist damage from external stimuli, and improve the skin's resistance.

[0056] Furthermore, the solid instant-dissolving mask prepared by the method provided by this invention has a unique instant solubility that greatly improves the usability of the mask. Unlike ordinary masks, it does not need to be in contact with the skin for a certain period of time. Simply spray water on the surface of the mask after it is applied to the skin, and the mask will dissolve and be absorbed to achieve its effects.

[0057] Compared to existing face masks that use base materials, solid instant-dissolving face masks use bio-based materials, employ a small amount of petroleum-based chemicals, and generate no solid waste, reducing environmental impact and minimizing essence waste. Furthermore, they do not require prolonged application; simply spray water on the face after application to dissolve and allow for absorption, effectively improving skincare efficiency and providing moisturizing and anti-aging benefits.

[0058] Example 1

[0059] A solid, fast-dissolving facial mask is prepared by: dissolving chitosan in a certain concentration of acetic acid solution in a 45°C water bath and stirring until completely dissolved to obtain a chitosan solution; treating the prepared chitosan solution in an ultrasonic cell disruptor at 600W for 20 minutes; and then preparing the mask base solution according to the following proportions: chitosan 0.7%, glycerin 1.0%, D-panthenol 2.0%, propylene glycol 2.5%, sodium hyaluronate 0.05%, purslane extract 0.05%, allantoin 1.0%, citric acid 0.01%, and hydroxyethyl cellulose 0.5%. The mixed solution is stirred at 600 rpm for 30 minutes. The mask solution is then poured into a polytetrafluoroethylene square mold and dried at 40°C to form the final shape.

[0060] Example 2

[0061] A solid, instant facial mask is prepared by using a 2.0% cationic starch solution: Cationic starch is dissolved in water and gelatinized in a 90°C water bath for 30 minutes, followed by incubation in a 60°C water bath for 30 minutes. The prepared cationic starch solution is then treated in an ultrasonic cell disruptor at 400W for 30 minutes. The mask base is then prepared according to the following proportions: 1.0% cationic starch, 2.0% glycerin, 1.0% 1,3-butanediol, 0.1% sodium hyaluronate, 0.02% Centella asiatica extract, 2.0% betaine, and 0.01% citric acid. The mixed solution is stirred at 600 rpm for 30 minutes. The mask solution is then poured into a plastic square mold and dried at 40°C to form the final shape.

[0062] Example 3

[0063] A solid, instant-dissolving facial mask is prepared using a 2.0% sodium alginate solution. The prepared sodium alginate solution is reacted in an 80°C water bath with a 2% dilute acid concentration for 1 hour. Other mask components are added in the following proportions: sodium alginate 1.0%, propylene glycol 2.0%, polyglycerol-10 1.0%, hydroxyethyl urea 1.5%, sorbitol 2.0%, sodium hyaluronate 0.05%, bio-based hydrolyzed collagen peptides 0.05%, grape seed extract 0.08%, and triethanolamine 0.05%. The mixed solution is stirred at 500 rpm for 20 minutes. The mask solution is poured into a glass circular mold and dried at 60°C to form the final shape.

[0064] Example 4

[0065] A solid, instant facial mask is prepared using a 2.0% sodium carboxymethyl cellulose solution. The prepared sodium carboxymethyl cellulose solution is treated in an ultrasonic cell disruptor at 800W for 10 minutes. The mask base is then prepared according to the following proportions: sodium carboxymethyl cellulose 1.0%, glycerin 2.0%, 1,3-butanediol 1.5%, sodium hyaluronate 0.1%, Centella asiatica extract 0.05%, grape seed extract 0.05%, betaine 2.0%, and citric acid 0.01%. The mixed solution is stirred at 600 rpm for 30 minutes. The mask solution is then poured into a rectangular plastic mold and dried at 40°C to form the final shape.

[0066] Example 5

[0067] A solid, instant facial mask is prepared using a 2.0% pullulan polysaccharide solution. The prepared pullulan polysaccharide solution is processed in a microwave reactor at 200W for 60 seconds. The mask base is prepared in the following proportions: pullulan polysaccharide 1.5%, glycerin 2.0%, D-panthenol 1.0%, 1,3-butanediol 0.5%, polysorbate alcohol 0.05%, sodium hyaluronate 0.03%, Centella asiatica extract 0.02%, bio-based hydrolyzed collagen peptides 0.06%, betaine 2.0%, and citric acid 0.01%. The mixed solution is stirred at 500 rpm for 40 minutes. The mask solution is poured into a plastic circular mold and dried at 40°C to form the final shape.

[0068]

[0069] Table 1 Comparison of detection results and target values ​​in Examples 1-5

[0070] As can be seen from Table 1, the main performance indicators of the solid instant-dissolving masks prepared in the above embodiments meet the target value requirements, indicating that the solid instant-dissolving masks developed by the present invention have a short dissolving time, excellent moisture absorption, moisturizing properties and skin absorption, and can achieve good skin care effects.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for preparing a substrate-free solid instant-dissolving facial mask, characterized in that, The preparation steps include the following: Step S1: Take a certain amount of natural polymer material, stir and disperse it to prepare the mask base liquid; Step S2: The mask base liquid obtained in step S1 is subjected to molecular degradation treatment and film-forming enhancement treatment; Step S3: Add moisturizer, surfactant, and bioactive substances to the mask base liquid after step S2, and stir for a certain time to obtain the mask film-forming liquid. Step S4: The mask-forming liquid obtained in step S3 is molded into a film, and after drying and setting, a substrate-free solid instant-dissolving mask is obtained; wherein, In step S2, the mask base liquid obtained in step S1 is subjected to molecular degradation treatment and film-forming enhancement treatment using an ultrasonic cell disruption device. The molecular degradation treatment and film-forming enhancement treatment methods include acid treatment or microwave treatment. The mass percentages of all components of the mask film-forming liquid after step S3 are as follows: 0.5-10% of the natural polymer material, 1-25% of the moisturizer, 0.1-2% of the surfactant, and 0.05%-2% of the bioactive substances.

2. The preparation method according to claim 1, characterized in that, In step S1, the stirring and dispersion time is 10-120 minutes, and the stirring and dispersion methods include ultrasonic dispersion, stirring dispersion with a stirrer, or stirring dispersion with a magnetic rotor.

3. The preparation method according to claim 1, characterized in that, The natural polymeric material mentioned in step S1 includes one or more combinations of methylcellulose, sodium carboxymethylcellulose, starch, sodium alginate, chitosan, konjac glucomannan, and pullulan.

4. The preparation method according to claim 1, characterized in that, The moisturizer in step S3 is one or more of the following: glycerin, hydroxyethyl urea, methyl propylene glycol, glycerin polyether-26, polyglycerol-10, D-panthenol, succinyl polysaccharide, 1,3-butanediol, caprylyl glycol, PEG-400, jojoba oil, sorbitol, betaine, allantoin, and plant extracts. The surfactant is one or more of hydroxyethyl cellulose, polysorbate alcohol 80, polysorbate alcohol 60, and sodium dodecyl sulfate; The bioactive substances include one or more of the following: purslane extract, centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptides, and sodium hyaluronate.

5. The preparation method according to claim 1, characterized in that, The pH value of the film-forming solution of the mask is 5.0-8.

0.

6. The preparation method according to claim 1, characterized in that, In step S4, the method of forming the mask film-forming liquid into a film includes casting method or coating release method, wherein the casting method uses a mold method or a casting machine to form the film.

7. The preparation method according to claim 1, characterized in that, In step S4, the drying methods include oven drying, ultrasonic heating or radiation drying, and the drying temperature is controlled between 20-80℃.

8. A solid, instant-dissolving facial mask, characterized in that, The solid instant-dissolving face mask is prepared by the preparation method according to any one of claims 1-7.

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