Preparation method for base-material-free new solid instant facial mask, and facial mask prepared thereby

Abstract

Provided in the present invention is a preparation method for a base-material-free new solid instant facial mask. The preparation method comprises: step S1, taking a natural polymer material, and stirring and dispersing same to formulate a facial mask base solution; step S2, subjecting the facial mask base solution obtained in step S1 to a molecular degradation treatment and a film-forming strengthening treatment; step S3, adding a humectant, a surfactant and a biological functional component to the facial mask base solution, and stirring same to obtain a facial mask film-forming solution; and step S4, drying and forming the facial mask film-forming solution obtained in step S3 to obtain a new solid instant facial mask. The new solid instant facial mask prepared according to the present method does not contain a similar base material structure as in a traditional facial mask, such that no waste is generated during use, and the facial mask is environmentally friendly, is more convenient to use and is easier to absorb. Further provided in the present invention is a new solid instant facial mask.

Description

A novel solid instant facial mask preparation method without substrate and the facial mask Technical Field

[0001] The present invention relates to the technical field of solid facial mask preparation, and in particular to a method for preparing a novel solid instant facial mask without a substrate and the facial mask. Background Art

[0002] Facial masks are important functional cosmetics for facial skin care. Ordinary sheet masks, which account for 70% of the market, are mainly made of spunlace non-woven fabrics and are mainly made of pure cotton and regenerated cellulose fibers. They have the following problems when used: (1) The mask fabric does not fit the skin or is not the right size, and the essence penetration, breathability, and thickness of the mask fabric are defective; (2) The essence cannot be fully absorbed, the essence is unevenly distributed, the mask is slippery, not moisturizing enough, and easily lost; (3) Wet mask products contain preservatives and other substances, which may be allergens and are not friendly to special groups such as sensitive skin and pregnant women; (4) The transdermal absorption capacity of the active substances in this type of mask is uncertain, and the more active 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 effective for busy working women in skin care. With the accelerating pace of life and society's demands for women to fulfill multiple roles, consumers are increasingly demanding not only better absorbency but also greater ease of use and safety. Added features such as shortened application time, fewer steps, reduced time and costs, and no preservatives are becoming key value-added innovations in facial mask products. Existing solid instant masks can address these challenges to a certain extent. They are safe, preservative-free, dissolve quickly in water, are easy to use, and require no washing after use. They are readily accepted by consumers and hold broad application prospects.

[0003] At present, the preparation method of solid instant facial mask mostly adopts electrospinning method, which is a special method of electrostatic atomization of polymer fluid. The prepared facial mask has properties such as nano size, high specific surface area and high surface activity. Chinese Patent 201910053466.0 uses budding short stalk enzyme polysaccharide as the skeleton to prepare collagen nano instant facial mask, including a non-woven fabric substrate layer and a nanofiber layer, and uses budding short stalk enzyme polysaccharide, hydrolyzed collagen (different molecular weights), polyglutamic acid, etc. as raw materials to prepare spinning solution, and uses electrospinning to prepare spinning membrane and receive it on the non-woven fabric substrate layer. The formed facial mask material is soluble in water and has a good wrinkle removal effect. Chinese Patent 202110372668.9 uses solutions of silk fibroin, sodium hyaluronate, budding short stalk enzyme, etc. to electrospin to form densely distributed nano-scale fibers, and uses aluminum foil as the substrate for receiving the electrospinning membrane to prepare a solid facial mask.

[0004] However, the electrospinning method has a complicated production process, and since there is no chemical bond formed inside the electrospinning membrane material, the strength is often poor. It is necessary to add additional substrates such as non-woven fabrics and pads to receive the electrospinning membrane in order to meet the processability and usability. The mask substrate will be discarded during use and cannot be reused, which will increase the consumption of petroleum-based chemicals and put pressure on environmental protection. In addition, most electrospinning methods require the use of organic solvents, otherwise high-quality nanofibers cannot be obtained. In addition, electrospinning membranes may also have defects such as high preparation cost, low preparation efficiency, poor mechanical properties, and easy damage to the membrane.

[0005] Summary of the Invention

[0006] In order to solve the technical defects and shortcomings of the prior art, on the one hand, the present invention provides a method for preparing a novel solid instant facial mask without a substrate, comprising the following preparation steps:

[0007] Step S1, taking a certain amount of natural polymer material, stirring and dispersing it to prepare a facial mask base liquid;

[0008] Step S2, subjecting the facial mask base liquid obtained in step S1 to molecular degradation treatment and film-forming strengthening treatment;

[0009] Step S3, adding a moisturizer, a surfactant, and a biologically effective component into the facial mask base liquid treated in step S2, and stirring for a certain period of time to obtain a facial mask film-forming liquid;

[0010] Step S4, shaping the facial mask forming liquid obtained in step S3 into a film shape, and drying and shaping it to obtain a novel solid instant facial mask without a substrate.

[0011] The novel solid instant facial mask prepared by the present method uses natural polymer materials as the skeleton structure of the solid instant facial mask, and is directly formed into a film shape with a facial mask forming liquid. After drying and shaping, a novel solid instant facial mask is formed. It does not contain a base material layer similar to a pad cloth or a film cloth in existing facial masks, so no waste is generated during use, which is environmentally friendly, more convenient to use, and easier to absorb. Moreover, since hydrogen bonds are formed between the natural polymers in the facial mask base liquid through chemical cross-linking, the novel solid instant facial mask prepared by the present method also has better strength and toughness. In addition, compared with the existing electrospinning method, the preparation method provided by the present invention has a simple process, lower requirements on equipment, and significantly improves production efficiency and product yield while reducing production costs.

[0012] Optionally, in step S1, the stirring and dispersing time is 10-120 minutes, and the stirring and dispersing method includes ultrasonic dispersion, stirrer stirring and dispersing, or magnetic rotor stirring and dispersing.

[0013] Optionally, the natural polymer material in step S1 may include one or more combinations of methyl cellulose, sodium carboxymethyl cellulose, starch, sodium alginate, chitosan, konjac glucomannan, and pullulan.

[0014] Preferably, in step S2, the facial mask base liquid obtained in step S1 is treated with an ultrasonic cell disruption device at a certain power for a certain time to perform molecular degradation treatment and film formation strengthening treatment.

[0015] Optionally, the molecular degradation treatment and film formation strengthening treatment in step S2 may include acid treatment or microwave treatment.

[0016] Optionally, in step S3, the stirring time is 20-90 minutes.

[0017] Optionally, the moisturizing agent in step S3 can be one or more of glycerin, hydroxyethyl urea, methylpropylene glycol, glyceryl polyether-26, polyglyceryl-10, D-panthenol, succinoglycan, 1,3-butylene glycol, caprylyl glycol, PEG-400, lubricating oil, sorbitol, betaine, allantoin and plant extract.

[0018] Optionally, the surfactant in step S3 may be a combination of one or more of hydroxyethyl cellulose, polysorbate 80, polysorbate 60, and sodium lauryl sulfate.

[0019] Optionally, the biologically effective substance in step S3 includes one or more combinations of purslane extract, Centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptide, and sodium hyaluronate.

[0020] Optionally, the mass percentages of all components of the facial mask forming liquid after treatment in step S3 are as follows: 0.5-10% natural polymer material, 1-25% moisturizer, 0.1-2% surfactant, and 0.05%-2% biologically effective substance; wherein the ratio of moisturizer to natural polymer material is 0.25-2, and the pH value of the facial mask forming liquid is 5.0-8.0.

[0021] Optionally, in step S4, the method of forming the facial mask film-forming liquid into a film may include a casting method or a coating release method, wherein the casting method may adopt a mold method or a casting machine method to form a film.

[0022] Optionally, in step S4, the drying method includes oven drying, ultrasonic heating or radiation drying, and the drying temperature is controlled at 20-80°C.

[0023] On the other hand, the present invention also provides a novel solid instant facial mask prepared according to the above method.

[0024] Compared to existing facial masks, the new solid instant mask uses bio-based materials and minimal petroleum-based chemicals. It contains no base material, produces no solid waste, reduces environmental pressure, and virtually eliminates essence waste. Furthermore, it eliminates the need for prolonged application; simply apply it to the face, spray it with water, and it dissolves, allowing it to be absorbed instantly. This effectively improves skincare effectiveness, moisturizing the skin and delaying aging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a flow chart of a method for preparing a novel solid instant facial mask without a substrate according to one embodiment of the present invention;

[0026] FIG2 is an infrared spectrum of a novel solid instant facial mask prepared according to the preparation method of the present invention;

[0027] FIG3 is a scanning electron microscope image of the surface of the novel solid instant facial mask obtained according to the preparation method of the present invention without adding any functional components;

[0028] FIG4 is a scanning electron microscope image of the surface of the novel solid instant facial mask obtained by the preparation method of the present invention when functional substances are added;

[0029] FIG5 is a scanning electron micrograph of a cross-section of a novel solid instant facial mask obtained according to the preparation method of the present invention without adding any functional components;

[0030] FIG6 is a scanning electron microscope image of a cross section of the novel solid instant facial mask obtained by the preparation method of the present invention when functional substances are added. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In order to make the purpose, technical solutions and advantages of the patent application of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below.

[0033] FIG1 shows a flow chart of a method for preparing a novel solid-state instant facial mask without a substrate according to an embodiment of the present invention. As shown in FIG1 , the method for preparing a novel solid-state instant facial mask without a substrate provided by the present invention comprises the following steps:

[0034] Step S1: taking a certain amount of natural polymer material, stirring and dispersing it to prepare a facial mask base liquid.

[0035] Step S2, subjecting the facial mask base liquid obtained in step S1 to molecular degradation treatment and film strengthening treatment. The purpose of subjecting the facial mask base liquid to molecular degradation treatment and film strengthening treatment is to form hydrogen bonds between the natural polymers in the facial mask base liquid through chemical cross-linking, so that the film-forming material has higher strength and toughness, meeting the processing and use performance of the facial mask, and reducing the molecular weight of the natural polymer material, improving the water solubility of the film-forming material, so that the film has softness and water solubility after formation, can adhere to the skin, and play a positive role in skin repair and protection.

[0036] Step S3, adding the moisturizer, surfactant, and biological efficacy component into the facial mask base liquid treated in step S2, stirring for a certain period of time, and obtaining the facial mask film-forming liquid.

[0037] Step S4, shaping the facial mask forming liquid obtained in step S3 into a film shape, and drying and shaping it to obtain a novel solid instant facial mask without a substrate.

[0038] The novel solid instant facial mask prepared according to the present method uses natural polymer materials as the skeleton structure of the solid instant facial mask, and is directly formed into a film shape with a facial mask forming liquid. After drying and shaping, a novel solid instant facial mask is formed. It does not contain a base material layer similar to a pad cloth or a film cloth in existing facial masks, so no waste is generated during use, which is environmentally friendly, more convenient to use, and easier to absorb. Moreover, since hydrogen bonds are formed between the natural polymers in the facial mask base liquid through chemical cross-linking, the novel solid instant facial mask prepared according to the present method also has better strength and toughness. In addition, compared with the electrospinning method used in the prior art to prepare solid facial masks, the preparation method provided by the present invention has a simple process, lower requirements on equipment, and significantly improves production efficiency and product yield while reducing production costs.

[0039] 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 form a facial mask base liquid. The stirring and dispersion methods include ultrasonic dispersion, stirrer stirring and dispersion, or magnetic rotor stirring and dispersion.

[0040] The natural polymer material in step S1 may include one or more combinations of methyl cellulose, sodium carboxymethyl cellulose, starch, sodium alginate, chitosan, konjac glucomannan, and pullulan.

[0041] In one embodiment of the present invention, in step S3, the moisturizer, surfactant, and biological efficacy component are mixed with the facial mask base liquid processed in step S2 in a certain proportion and stirred for 20-90 minutes to form a facial mask film-forming liquid.

[0042] In one embodiment of the present invention, in step S2, the facial 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 strengthening treatment. The energy generated by the cavitation effect of ultrasound forces the liquid to flow, generating pressure and promoting the formation of cavitation bubbles. The energy absorbed by the cavitation bubbles is released in a very short time, creating 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 film material. At the same time, ultrasonic treatment will accelerate molecular degradation, reduce molecular weight and particle size, and improve the water solubility of the film material.

[0043] Using Fourier transform infrared spectrometer (FT-IR) to analyze the structure of the membrane material, it can be found that the membrane formed by the natural polymer material forms a stable structure through hydrogen bonds. Figure 2 is an infrared spectrum of the new solid instant facial mask obtained according to the preparation method of the present invention, wherein curve (a) is a spectrum of the natural polymer material without molecular degradation treatment and compounded with functional substances to form a film, curve (b) is a spectrum of the natural polymer material after molecular degradation treatment and compounded with moisturizing substances such as hyaluronic acid to form a film, and curve (c) is a spectrum of the natural polymer material after molecular degradation treatment and compounded with functional substances such as hydrolyzed collagen peptides to form a film. It can be seen from curve (a) that the characteristic peaks of the membrane material that has not been molecularly degraded are obvious, indicating that the functional groups of the polymer material are not destroyed during film formation and are still present in the membrane material. It can be seen from curves (b) and (c) that after the natural polymer material undergoes molecular degradation treatment, the intensity of the functional group characteristic peak is significantly weakened, indicating that the molecular degradation treatment will partially destroy the original groups of the polymer material, and no new characteristic peaks appear, indicating that no new chemical bonds are generated after film formation, and a stable structure is formed inside the membrane material through hydrogen bonds.

[0044] Figures 3 and 5 are scanning electron microscope (SEM) images of the surface and cross-section of the novel solid instant facial mask obtained by the preparation method of the present invention when no functional components are added. From the scanning electron microscope images, it can be seen that the surface of the membrane is flat and smooth, indicating that the surface flatness of the membrane material is good. Therefore, the hydroxyl groups of the natural polymer material form hydrogen bonds inside the membrane, thereby obtaining a stable membrane structure.

[0045] Figures 4 and 6 show scanning electron microscopic observations of the surface and cross-section of a facial mask formulated with hyaluronic acid and other active ingredients, respectively. While the surface remains smooth, it exhibits some wrinkles and small particles. This is due to the enhanced hygroscopicity of the membrane material after the addition of moisturizing agents, which increases the water content and flexibility. The cross-sectional image shows a uniform, dense film thickness of approximately 50 μm, demonstrating that the chemical cross-linking reaction between the film-forming and active ingredients has produced a stable, uniform composite membrane.

[0046] 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 formation enhancement treatment in step S2.

[0047] In the step S4 of the above-mentioned preparation method, the method that facial mask film-forming liquid is shaped into film-like can comprise tape casting method or coating release method.The tape casting method can adopt two specific modes of mold method film forming and tape casting machine film forming, wherein the mold method is to pour facial mask film-forming liquid into mold, and the performances such as finished film quantitative, thickness, uniformity are regulated and controlled according to factors such as film-forming liquid concentration, addition, requiring mold to have certain depth and shape.The tape casting machine film forming refers to that film-forming liquid is injected into tape casting machine and casts and forms, also known as belt casting method, scraper method, film-forming liquid is flowed from the bottom of hopper to the film carrier (such as cellulose acetate, polyester, polypropylene, polytetrafluoroethylene, steel belt etc.) moving forward, by scraper height regulation film thickness, dry post-forming. The coating release method is to apply the film-forming liquid on the release paper by coating. After drying, the finished mask is peeled off from the release paper and rolled up separately. The release paper can be reused. By controlling the concentration of the film-forming liquid, the wire rod model, the wire rod pressure, the coating speed and other factors, the amount of coating glue can be controlled to adjust the quality, thickness and other parameters of the mask product.

[0048] The drying and shaping methods can be oven drying (vacuum drying, low temperature drying), ultrasonic heating, radiation drying, etc., and the temperature is controlled at 20-80°C to obtain a new solid instant facial mask.

[0049] In the present invention, the thickness of the new solid facial mask obtained according to the above-mentioned preparation method can be flexibly determined based on user needs and is not limited by the preparation conditions in the prior art. However, after many experiments by R&D personnel, considering both the user's feeling of use and the mask's absorbency, the thickness of the mask is preferably determined between 40-1000 μm. When using a facial mask, users hope that the mask is light and thin, and can be dissolved after spraying water to improve skin care efficiency. Therefore, the mask needs to be made relatively thin. However, if the mask is too thin, it is bound to reduce the amount of effective skin care substances added to the mask, weakening the efficacy. In addition, for a mask that is too thin, since there is no base material such as a lining cloth, the step of sticking it on the face will become difficult, affecting the user's feeling of use.

[0050] Specifically, the moisturizing agent in step S3 can be one or more of glycerin, hydroxyethyl urea, methylpropylene glycol, glyceryl polyether-26, polyglyceryl-10, D-panthenol, succinoglycan, 1,3-butylene glycol, caprylyl glycol, PEG-400, lubricating oil, sorbitol, betaine, allantoin, and plant extracts.

[0051] In one embodiment of the present invention, the surfactant may be a combination of one or more of hydroxyethyl cellulose, polysorbate 80, polysorbate 60, and sodium lauryl sulfate.

[0052] In one embodiment of the present invention, the biologically effective substance includes a combination of one or more of purslane extract, Centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptides, and sodium hyaluronate.

[0053] Natural polymers need to have a certain compatibility with the ingredients such as moisturizers, surfactants, and biological efficacy substances added to the facial mask base liquid, and cannot destroy the effects of the efficacy substances, so they need to be optimized and selected. In one embodiment of the present invention, the mass percentages of all components of the facial mask film-forming liquid after processing by step S3 are as follows: 0.5-10% natural polymer materials, 1-25% moisturizers, 0.1-2% surfactants, and 0.05%-5% biological efficacy substances; wherein, the ratio of moisturizers to natural polymers is between 0.25-2, and the pH value of the facial mask film-forming liquid is 5.0-8.0. The ratio of moisturizers to natural polymers is between 0.25-2, which can not only ensure the film-forming properties of the facial mask, but also ensure the amount of moisturizing substances added to the facial mask, thereby ensuring the usability of the facial mask.

[0054] In one embodiment of the present invention, the ingredients 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 can be one or a combination of citric acid, phosphoric acid, tartaric acid, and sodium dihydrogen phosphate. The alkaline regulator can be one or a combination of diethanolamine, triethanolamine, sodium hydroxide, sodium carbonate, and sodium bicarbonate.

[0055] In one embodiment of the present invention, the mass percentage of the pH regulator in the facial mask forming liquid after being processed in step S3 is 0.005-0.2%.

[0056] The novel solid instant facial mask prepared by the method provided by the present invention can be used as a cosmetic for beauty care of multiple parts of the face, eyes, neck, etc. The facial mask has a certain shape, tensile strength and elasticity. After being sprayed with water, it is converted into a liquid and absorbed by the skin. As a beauty facial mask, it has good skin-adhering performance and good skin feel. The effective ingredients are one or more of purslane extract, Centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptide, and sodium hyaluronate. Their addition can better protect skin cells. These ingredients can penetrate into the bottom layer of the skin to replenish moisture, enhance the skin's moisturizing ability, delay skin aging, protect the skin from external stimuli, soothe and moisturize, resist the damage of external stimuli to the skin, and improve the skin's resistance.

[0057] In addition, the unique instant solubility of the new solid instant facial mask prepared by the method provided by the present invention greatly improves the usability of the facial mask. When used, it does not need to be in contact with the skin for a certain period of time like an ordinary facial mask. It only needs to spray water on the surface of the facial mask after it is in contact with the skin, and the facial mask will dissolve and absorb to achieve its effect.

[0058] Compared to existing face masks that use bio-based materials, the new solid instant-dissolving mask uses bio-based materials and minimal petroleum-based chemicals. It produces no solid waste, reducing environmental pressure and virtually eliminating the waste of essence. Furthermore, it eliminates the need for prolonged application; simply apply it to the face, spray it with water, and it dissolves, allowing it to be absorbed instantly. This effectively improves skincare efficiency, moisturizing the skin and delaying aging.

[0059] Example 1

[0060] A solid instant facial mask comprises a 1.0% chitosan solution prepared by dissolving chitosan in an acetic acid solution of a certain concentration in a 45°C water bath and stirring until completely dissolved to obtain a chitosan solution. The prepared chitosan solution is then treated in an ultrasonic cell disruptor at 600W for 20 minutes. A facial mask base liquid is then prepared according to the following proportions: 0.7% chitosan, 1.0% glycerin, 2.0% D-panthenol, 2.5% propylene glycol, 0.05% sodium hyaluronate, 0.05% purslane extract, 1.0% allantoin, 0.01% citric acid, and 0.5% hydroxyethyl cellulose. The mixed solution is stirred at 600 rpm for 30 minutes, poured into a polytetrafluoroethylene square mold, and dried at 40°C to form a mask.

[0061] Example 2

[0062] A solid instant facial mask is prepared by preparing a 2.0% cationic starch solution: the cationic starch is dissolved in water, gelatinized in a 90°C waterbath for 30 minutes, and then kept in a 60°C waterbath for 30 minutes. The prepared cationic starch solution is treated in an ultrasonic cell disruptor at 400W for 30 minutes. The mask base liquid is then prepared according to the following proportions: 1.0% cationic starch, 2.0% glycerin, 1.0% 1,3-butylene glycol, 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, poured into a square plastic mold, and dried at 40°C to form the mask.

[0063] Example 3

[0064] A solid instant facial mask is prepared by preparing a 2.0% sodium alginate solution. The prepared sodium alginate solution is reacted in a 2% dilute acid solution at 80°C in a water bath for one hour. The remaining mask components are then added in the following proportions: 1.0% sodium alginate, 2.0% propylene glycol, 1.0% polyglycerol-10, 1.5% hydroxyethyl urea, 2.0% sorbitol, 0.05% sodium hyaluronate, 0.05% bio-based hydrolyzed collagen peptide, 0.08% grape seed extract, and 0.05% triethanolamine. The mixed solution is stirred at 500 rpm for 20 minutes, poured into a circular glass mold, and dried at 60°C to form the mask.

[0065] Example 4

[0066] A solid instant facial mask is prepared by preparing a 2.0% sodium carboxymethylcellulose solution. The prepared sodium carboxymethylcellulose solution is treated in an ultrasonic cell disruptor at 800W for 10 minutes, and then a facial mask base liquid is prepared according to the following proportions: 1.0% sodium carboxymethylcellulose, 2.0% glycerin, 1.5% 1,3-butylene glycol, 0.1% sodium hyaluronate, 0.05% Centella asiatica extract, 0.05% grape seed extract, 2.0% betaine, and 0.01% citric acid. The mixed solution is stirred at 600 rpm for 30 minutes, poured into a plastic rectangular mold, and dried at 40°C to form a mask.

[0067] Example 5

[0068] A solid instant facial mask is prepared by preparing a 2.0% pullulan solution. The prepared pullulan solution is treated in a microwave reactor at a microwave power of 200W for 60 seconds. A facial mask base liquid is prepared according to the following proportions: 1.5% pullulan, 2.0% glycerin, 1.0% D-panthenol, 0.5% 1,3-butylene glycol, 0.05% polysorbate, 0.03% sodium hyaluronate, 0.02% Centella asiatica extract, 0.06% bio-based hydrolyzed collagen peptide, 2.0% betaine, and 0.01% citric acid. The mixed solution is stirred at 500 rpm for 40 minutes, poured into a plastic circular mold, and dried at 40°C to form a mask.

[0069] Table 1 Comparison of the test results of Examples 1-5 with the target values

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

[0071] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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 above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for preparing a novel solid instant facial mask without a substrate, characterized in that: The method comprises the following preparation steps: Step S1, taking a certain amount of natural polymer material, stirring and dispersing it to prepare a facial mask base liquid; Step S2, subjecting the facial mask base liquid obtained in step S1 to molecular degradation treatment and film-forming strengthening treatment; Step S3, adding a moisturizer, a surfactant, and a biologically effective component into the facial mask base liquid treated in step S2, and stirring for a certain period of time to obtain a facial mask film-forming liquid; Step S4, forming the facial mask forming liquid obtained in step S3 into a film shape, and after drying and shaping, obtaining a novel solid instant facial mask without a substrate.

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

3. The preparation method according to claim 1, characterized in that: The natural polymer material in step S1 may include one or more combinations of methyl cellulose, sodium carboxymethyl cellulose, starch, sodium alginate, chitosan, konjac glucomannan, and pullulan.

4. The preparation method according to claim 1, characterized in that: In step S2, the facial mask base liquid obtained in step S1 is subjected to molecular degradation treatment and film-forming strengthening treatment using an ultrasonic cell disruption device.

5. The preparation method according to claim 1, characterized in that: In step S2, the molecular degradation treatment and film formation enhancement treatment may include acid treatment or microwave treatment.

6. The preparation method according to claim 1, characterized in that: The moisturizing agent in step S3 may be one or more of glycerin, hydroxyethyl urea, methylpropylene glycol, glyceryl polyether-26, polyglyceryl-10, D-panthenol, succinoglycan, 1,3-butylene glycol, caprylyl glycol, PEG-400, lubric acid oil, sorbitol, betaine, allantoin and plant extract; The surfactant may be a combination of one or more of hydroxyethyl cellulose, polysorbate 80, polysorbate 60, and sodium lauryl sulfate; The biologically effective substance comprises one or more combinations of purslane extract, Centella asiatica extract, grape seed extract, collagen, bio-based hydrolyzed collagen peptide, and sodium hyaluronate.

7. The preparation method according to claim 1, characterized in that: The mass percentages of all components of the facial mask film-forming liquid after being processed in step S3 are: 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 biologically effective substance; Among them, the ratio of the moisturizer to the natural polymer material is 0.25-2, and the pH value of the facial mask forming liquid is 5.0-8.

0.

8. The preparation method according to claim 1, characterized in that: In step S4, the method of forming the facial mask forming liquid into a film may include a casting method or a coating release method, wherein the casting method may adopt a mold method or a casting machine method.

9. The preparation method according to claim 1, characterized in that: In step S4, the drying method includes oven drying, ultrasonic heating or radiation drying, and the drying temperature is controlled at 20-80°C.

10. A novel solid instant facial mask, characterized in that: The novel solid instant facial mask is prepared by the preparation method according to any one of claims 1-9.

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