Hydrogel mask material, preparation method thereof and hydrogel mask

Abstract

The invention relates to the technical field of cosmetics, in particular to a hydrogel mask material, a preparation method of the hydrogel mask material and a hydrogel mask.The preparation method of the hydrogel mask material comprises the following steps that S1, base collagen liquid is prepared; s2, preparing liquid crystals: dispersing sodium alginate in deionized water to obtain the liquid crystals; s3, liquid crystal loading: uniformly mixing the base membrane stock solution and the liquid crystal to obtain a base membrane stock solution; s4, coating to form a film: coating the base material raw liquid to prepare a wet film; s5, laminating a pearlized film backing: after the wet film is cured and molded, paving the cured wet film on the pearlized film to obtain a laminated film; s6, drying and cutting: drying the laminated film to obtain a dry film, and cutting the dry film to obtain a hydrogel mask material; the method has the advantages that the production method of the hydrogel mask material can be improved, and market popularization and large-scale application are expanded.

Description

Technical Field

[0001] This application relates to the technical field of cosmetics, and in particular to a hydrogel facial mask material, its preparation method, and a hydrogel facial mask. Background Technology

[0002] Hydrogel masks, due to their excellent skin affinity, superior water retention, and efficient capacity for carrying and releasing active nutrients, offer longer-lasting hydration and a gentler user experience compared to traditional non-woven masks, making them a popular choice in the cosmetics industry. However, existing hydrogel masks still have significant shortcomings: firstly, industrial production commonly employs a "wet" production method, which is not only inefficient but also makes the masks susceptible to microbial contamination, requiring the addition of large amounts of preservatives to ensure product safety. This increases production costs and poses potential risks of skin irritation. Secondly, the mask material often has a rubbery feel, resulting in poor adherence to the skin and a less than ideal sensory experience. Therefore, these factors severely restrict the market promotion and large-scale application of hydrogel masks. Summary of the Invention

[0003] In order to improve the production method of hydrogel mask material and expand its market promotion and large-scale application, this application provides a hydrogel mask material, its preparation method and a hydrogel mask.

[0004] In a first aspect, this application provides a method for preparing a hydrogel facial mask material, employing the following technical solution: A method for preparing a hydrogel facial mask material, comprising the following steps: S1. Preparation of base collagen solution The base collagen solution includes potassium chloride, glycerol, propylene glycol, carrageenan, glucomannan and deionized water. After the raw materials except for deionized water are evenly dispersed, deionized water is added, and the mixture is heated and stirred until the powder dissolves to obtain the base collagen solution. S2, Preparation of liquid crystal Sodium alginate was dispersed in deionized water to obtain a liquid crystal. S3, LCD loading After the base collagen solution and liquid crystal are mixed evenly, the base film solution is obtained; S4, Coating to form a film A wet film is prepared by coating the base film stock solution; S5, Pearl film backing After the wet film has cured and solidified, it is laid on the pearlescent film to obtain the laminated film; S6. Drying and Cutting The laminating film is dried to obtain a dry film, which is then cut to obtain the hydrogel mask material.

[0005] By adopting the above technical solution, this application provides a process method for the industrialized and standardized production of dry hydrogel mask materials. This innovative process employs a stepwise preparation and composite molding approach for the base collagen solution (skeleton) and liquid crystal (functional unit), which significantly improves the thickness retention capability of the dry film after rehydration. Its maximum reabsorption thickness loss rate is only 5.77%, far lower than the 30.77% loss rate of existing wet gel films after drying.

[0006] This process, with its core steps of preparing a base collagen solution, liquid crystal preparation, liquid crystal loading, coating and film formation, pearlescent film backing lamination, drying, and cutting, produces a dry film product with significantly reduced water activity. This effectively inhibits microbial growth at its source, greatly improving storage and transportation convenience. Simultaneously, this process addresses the industry pain points of traditional "wet" production methods, which heavily rely on casting for shaping, resulting in low production efficiency, susceptibility to contamination, and the need for large amounts of preservatives, thus significantly improving economic efficiency.

[0007] When traditional wet films are dried, the hydrophilic polymer chains inside the hydrogel undergo irreversible entanglement and collapse, physical cross-linking points break, and the three-dimensional network pores shrink significantly. This results in a decreased liquid absorption rate and insufficient expansion of the dry film during rehydration, with the reabsorbed thickness only about 70% of the original wet film. Furthermore, the inherent rubbery feel of hydrogel masks is difficult to eliminate, severely limiting the final product's usability and efficacy. This application innovatively introduces "3D liquid crystal loading composite molding technology." This technology integrates highly absorbent essence liquid crystals into the plant polymer gel film through a liquid crystal loading system in a way that embeds and embeds them, constructing a novel "skeleton-functional dual-element" composite film structure. This structure not only greatly reduces the thickness loss during dry film reabsorption but also significantly improves the film's flexibility and dynamic adhesion, allowing it to adhere tightly to facial expressions and greatly eliminating the "floating film feel" and edge lifting problems.

[0008] In summary, this application is the first to achieve structural reversibility of drying and rehydration at the materials science level, breaking the industrial paradox that "efficient production" and "superior experience" of hydrogel masks cannot be achieved simultaneously, and providing high-performance, standardized basic materials for the functional dressing market.

[0009] Preferably, the weight percentage of each raw material in the base collagen solution is as follows: potassium chloride 0.1-0.5%, glycerol 2-5%, propylene glycol 1-4%, carrageenan 1-2%, glucomannan 0.5-1.5%, and the balance is deionized water.

[0010] By employing the above technical solution and limiting the proportions of each raw material in the base collagen solution, a dry film can be made to have excellent three-dimensional skeletal support. Specifically, carrageenan and glucomannan, in this specific ratio, can form a three-dimensional gel network with moderate strength and stable structure, serving as the "skeleton" of the film material and ensuring the mechanical strength of the dry film and its shape retention after rehydration. Potassium chloride, as an ionic crosslinking agent, promotes the gel formation of carrageenan, making the network structure denser and more stable. Glycerin and propylene glycol, as humectants and plasticizers, prevent the dry film from becoming excessively brittle, improving flexibility and user comfort. This ratio range ensures that the base collagen solution has a suitable viscosity, facilitating subsequent mixing, coating, and other processing operations, while providing an ideal environment for the uniform loading of liquid crystals.

[0011] Preferably, the sodium alginate in the liquid crystal has a weight percentage of <4.5%.

[0012] By adopting the above technical solution, this limitation sets an upper limit for the concentration of sodium alginate in the liquid crystal. This prevents the liquid crystal from having excessively high viscosity, which would make mixing with the base colloidal solution difficult, hindering uniform dispersion, easily leading to clumping, affecting the uniformity of the final film material and the formation of the "skeleton-functional dual-component integrated" structure, thereby impairing rehydration performance and sensory experience. This upper limit ensures that the liquid crystal has good flowability and miscibility.

[0013] Preferably, the sodium alginate in the liquid crystal has a weight percentage of 0.5-3.0%.

[0014] By adopting the above technical solution and optimizing the content, the mechanical properties of hydrogel masks can be further effectively guaranteed, and the user experience can be improved.

[0015] Preferably, the feed flow ratio of the base collagen solution to the liquid crystal is (7-10):(0.5-2.5).

[0016] By adopting the above technical solution, this flow ratio ensures that the membrane material is primarily composed of a stable gel "skeleton" while simultaneously loading a sufficient amount of functional "liquid crystal units." If the ratio is too high (too few liquid crystals), the rehydration enhancement effect will be insignificant; if the ratio is too low (too many liquid crystals), it may weaken the integrity of the gel skeleton and affect the membrane material's strength. Within this preferred range, the membrane material can simultaneously possess excellent rehydration thickness, good softness and conformability, and sufficient mechanical strength, achieving a perfect balance between sensory experience and practical performance.

[0017] Preferably, in the S3 liquid crystal loading step, the base collagen solution and the liquid crystal are mixed by a dynamic mixer or mechanical stirring.

[0018] By adopting the above technical solutions, the spiked dynamic mixer is suitable for continuous, high-efficiency, large-scale production, producing uniform and rapid mixing; mechanical stirring is more suitable for batch production or R&D stages, with relatively simple equipment requirements. These two options give manufacturers the flexibility to choose the most suitable process based on their own equipment and capacity.

[0019] Preferably, in step S1, the powder is heated to 70-90°C and then stirred at this temperature until it dissolves.

[0020] By adopting the above technical solutions, the powder dissolution rate can be accelerated.

[0021] Secondly, this application provides a hydrogel mask material, which adopts the following technical solution: A hydrogel facial mask material is prepared by the method for preparing the hydrogel facial mask material.

[0022] Secondly, this application provides a hydrogel facial mask, which adopts the following technical solution: A hydrogel face mask, wherein the hydrogel face mask material is the hydrogel face mask material as described in claim 7.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This application provides a process for the industrial-scale, standardized production of dry hydrogel facial mask materials. This innovative process employs a step-by-step preparation and composite molding approach using a base collagen solution (skeleton) and liquid crystal (functional unit), which significantly improves the thickness retention capability of the dry film after rehydration. Its maximum reabsorption thickness loss rate is only 5.77%, far lower than the 30.77% loss rate of existing wet gel films after drying. Simultaneously, the flexibility and facial fit of the film material are significantly enhanced, greatly optimizing the user experience of hydrogel facial masks.

[0024] 2. This process uses the following core steps: preparation of base collagen solution → liquid crystal preparation → liquid crystal loading → coating and film formation → pearlescent film backing → drying → cutting. The resulting dry film product has a significantly reduced water activity (<0.6 Aw), which can inhibit microbial growth at the source and greatly improve the convenience of storage and transportation. At the same time, this process also solves the industry pain points of traditional "wet" production mode, which relies heavily on casting and shaping, has low production efficiency, is susceptible to contamination, and requires the addition of large amounts of preservatives, thus significantly improving production economic efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a hydrogel mask material in Example 2. Detailed Implementation

[0026] The following provides a more detailed description of this application in conjunction with specific details.

[0027] raw material All raw materials used in the embodiments of this application are common commercially available products. Among them, carrageenan is of the κ-type, and the viscosity of a 1.5% mass fraction solution is 100 mPa·s; glucomannan has a viscosity of 20000 mPa·s at a mass fraction of 1%; and sodium alginate has a viscosity of 250 mPa·s at a mass fraction of 1%. Example

[0028] Examples 1-3 A hydrogel mask material, the structure of which is as follows: Figure 1 As shown, the hydrogel mask material is made from a base collagen solution, liquid crystal, and pearlescent film. The raw materials for the base collagen solution and liquid crystal are shown in Tables 1 and 2. The preparation method of the hydrogel mask material is as follows: S1. Preparation of base collagen solution Weigh out carrageenan, glucomannan, and potassium chloride according to the formula and put them into the mixing container; Add the specified amounts of glycerin and propylene glycol, and stir thoroughly to ensure the powder is evenly dispersed. Add deionized water, heat in a water bath to 85°C, stir at a constant temperature for 90 minutes until the powder is completely dissolved to prepare the base collagen solution; S2, Preparation of liquid crystal Weigh out sodium alginate and deionized water according to the formula, and stir them thoroughly to form a uniform colloidal liquid crystal. S3, LCD loading The base collagen solution and liquid crystal were mixed using a spiked dynamic mixer. The flow rate ratio of the spiked dynamic mixer was 8.5:1.5. The rotation speed was set to 50, 100 and 150 rpm respectively. The mixture was then discharged to obtain the base film stock solution. S4, Coating to form a film Pour the base film stock solution onto the coating machine and coat it into a wet film with a thickness of 0.52 mm; S5, Pearl film backing After the wet film has cured and formed, it is evenly spread on the pearlescent film, ensuring that the two are tightly bonded together to obtain the laminated film; S6. Drying and Cutting The laminating film is placed in an 80℃ constant temperature forced-air drying oven and dried for 40 minutes to make it completely dry, resulting in a dry film. The dry film is then cut into a mask face shape that conforms to the standard of human facial contours using a laser cutting machine, thus producing the hydrogel mask material.

[0029] Table 1. Weight percentage (%) of each raw material in the collagen solutions of Examples 1-3

[0030] Table 2. Weight percentage (%) of each raw material in the liquid crystals of Examples 1-3

[0031] Example 4 A hydrogel mask material differs from Example 2 in that, in its S3 liquid crystal loading process, mechanical stirring is used for mixing. The flow ratio of the base gel and the liquid crystal is 8.5:1.5, and the mixture is stirred at a constant speed of 100 rpm for 50 minutes. The mixture is then discharged to obtain the base film stock solution. The remaining steps are the same as in Example 2.

[0032] Example 5 A hydrogel mask material differs from Example 2 in that, in the preparation of liquid crystal in S2, the weight percentage of sodium alginate added is 0.5%, while the remaining steps are the same as in Example 2.

[0033] Example 6 A hydrogel mask material differs from Example 2 in that the weight percentage of sodium alginate added in the liquid crystal preparation process S2 is 1.0%, while the remaining steps are the same as in Example 2.

[0034] Example 7 A hydrogel mask material differs from Example 2 in that the sodium alginate added in the S2 liquid crystal preparation process is 3.0% by weight, while the remaining steps are the same as in Example 2.

[0035] Example 8 A hydrogel mask material differs from Example 2 in that, in its S4 coating process, the thickness of the wet film is 0.4 mm, while the remaining steps are the same as in Example 2.

[0036] Example 9 A hydrogel mask material differs from Example 2 in that, in its S4 coating process, the thickness of the wet film is 0.7 mm, while the remaining steps are the same as in Example 2.

[0037] Comparative Example Comparative Example 1 A hydrogel facial mask material is prepared from a base collagen solution and a pearlescent film. The raw materials of the base collagen solution are shown in Example 2 of Table 1. The preparation method of the hydrogel facial mask material is as follows: S1. Preparation of base collagen solution Weigh out carrageenan, glucomannan, and potassium chloride according to the formula and put them into the mixing container; Add the specified amounts of glycerin and propylene glycol, and stir thoroughly to ensure the powder is evenly dispersed. Add deionized water, heat in a water bath to 85°C, stir at a constant temperature for 90 minutes until the powder is completely dissolved to prepare the base collagen solution; S2, Coating to form a film Pour the base film stock solution onto the coating machine and coat it into a wet film with a thickness of 0.52 mm; S3, Adhesive pearlescent film backing After the wet film has cured and formed, it is evenly spread on the pearlescent film, ensuring that the two are tightly bonded together to obtain the laminated film; S4. Drying and Cutting The laminating film is placed in an 80℃ constant temperature forced-air drying oven and dried for 40 minutes to make it completely dry, resulting in a dry film. The dry film is then cut into a mask face shape that conforms to the standard of human facial contours using a laser cutting machine, thus producing the hydrogel mask material.

[0038] Comparative Example 2 A hydrogel mask material differs from Example 2 in that, in the preparation of liquid crystal in S2, the weight percentage of sodium alginate added is 4.5%, while the remaining steps are the same as in Example 2.

[0039] Performance testing Detection methods / test methods Hydrogel mask materials were prepared according to the preparation methods of Examples 1-9 and Comparative Examples 1-2, and then tested according to the following testing methods. The test results are as follows.

[0040] The hydrogel mask material was fully reabsorbed, and then the following tests were performed. The reabsorption process for the hydrogel mask material is as follows: The hydrogel mask materials from Examples 1-9 and Comparative Examples 1-2 were placed in a flat mask bag, and 30 mL of deionized water (containing 0.5% p-hydroxyacetophenone preservative by mass) was injected into the bag. The bag was then sealed tightly. After the hydrogel mask material was allowed to stand and fully absorb the deionized water for 72 hours, the mask was removed and the pearlescent backing was removed to complete the reabsorption process, resulting in a hydrogel mask.

[0041] I. Sensory Evaluation Experiment Twelve individuals familiar with the feel of hydrogel masks and trained in sensory evaluation were selected as evaluators to conduct sensory evaluations on the softness and fit of the hydrogel masks to the T-zone. Scores were given based on the index definitions in Tables 3 and 4, and the test results are shown in Table 5.

[0042] (1) Sample preparation Five samples of the corresponding examples or comparative examples were taken for each test item and then tested. (2) Experimental environment Temperature 25±2℃, humidity 50±10%, quiet and odorless environment, sufficient light (for easy observation); (3) Sensory Experiment Procedure Before evaluation: Sensory testers need to clean their face with unscented facial cleanser and dry their face to ensure that there is no oil or moisture residue on the face; Sample allocation: Each evaluator will receive two samples of the same example or comparative example, one for softness evaluation and the other for T-zone conformity evaluation. The order of sample presentation will be randomly assigned to each evaluator (to avoid order effect). Evaluation content: The softness and T-zone conformity of the face mask are scored according to the evaluation index definitions in Tables 3 and 4; Evaluation interval requirements: After evaluating each sample, rest for at least 30 minutes before evaluating the next sample to eliminate sensory fatigue.

[0043] Table 3 Sensory Evaluation Table of Mask Softness

[0044] Table 4 Sensory Evaluation Table of Mask Adhesion in the T-zone

[0045] Table 5 Sensory evaluation results of softness

[0046] Table 6 Sensory evaluation results of T-zone conformity

[0047] Based on the test results in Tables 5 and 6, the hydrogel mask prepared in this application showed significantly better scores (mean ± standard deviation) than the control group in terms of softness and T-zone conformity. Furthermore, the evaluation scores were highly consistent (with small deviations), indicating that the experience of "softer" and "more conforming" is highly reproducible.

[0048] Combining Examples 2 and 4, the liquid crystal loading can be uniformly mixed with the base collagen solution and the liquid crystal by mechanical stirring or by a serrated dynamic mixer.

[0049] In conjunction with Examples 2 and 5-7, under the condition that the flow ratio of the base collagen solution to the liquid crystal is constant, as the concentration of sodium alginate in the liquid crystal increases, the sensory evaluation of the softness of the obtained hydrogel mask shows a gradual increasing trend in all tests of the sensory evaluation of softness and the sensory evaluation of T-zone conformity.

[0050] II. Dry film reabsorption thickness The pearlescent film backing was removed from the corresponding hydrogel mask samples of each embodiment and comparative example, and the thickness of the hydrogel film was then measured. Five parallel tests were performed on each sample of each embodiment, and the average value was recorded as shown in Table 7.

[0051] Table 7 Reabsorption Thickness Test Results

[0052] As shown in Table 7, compared with hydrogel masks prepared by traditional drying methods, this application, by adding superabsorbent liquid crystals and integrating them into the plant polymer gel membrane system in an embedded manner, can construct a novel "skeleton-functional dual-component" composite membrane structure, which significantly reduces the reabsorption thickness loss rate. Specifically, the reabsorption thickness loss rate of the hydrogel masks prepared by this application is less than 17.31%, and can reach as low as 3.85%, which can significantly reduce the thickness loss rate (30.77%) of hydrogel masks prepared by traditional drying methods.

[0053] III. Mechanical Property Testing The testing was conducted according to the methods in Q / SS01-2025 (Enterprise Standard), and the mechanical performance standards are shown in Table 8. The measured mechanical performance data are shown in Table 9. The specific test methods are as follows: (1) Wet film sampling: First, take a wet film of sufficient size (after reabsorption), and use a 15mm sampler to take 10 samples of about 15cm each. After sampling, test the mechanical properties of the samples using a tensile testing machine and record the experimental data. (2) Tensile testing conditions: The distance between the two clamps of the tensile testing machine is 100mm, and the tensile speed is 100±10mm / min; (3) Sample thickness test: The sample thickness shall be measured in accordance with the test method requirements of GB / T7125 tape thickness. When measuring the thickness of the film, at least five points at different locations shall be tested for each sample. The thickness of the thinnest point among the five test points shall be taken as the thickness of the sample. (4) Sample inspection: If the membrane sample is found to be damaged before testing, the sample is invalid and needs to be resampled; if the membrane is found to be damaged during testing and the final membrane performance data deviates significantly from other samples, the sample is invalid and needs to be resampled and retested. (5) Data calculation formula: Tensile strength (force per unit area) σ = F / (b*d); Where σ: tensile strength (MPa); F: force (N); b: width (mm); d: thickness (mm); Tensile strength (force per unit width) σ = F / b; Where σ: tensile strength (kN / m); F: force (N); b: width (mm); Elongation: ε = l1 / l0 * 100; Where ε: deformation rate or elongation at break (%); l1: tensile length (mm); l0: distance between clamps (mm); (6) Data selection criteria: After the wet film sample is tested, 10 sets of data are obtained. An average value is obtained and compared with the inspection standard to determine whether the film is qualified. The operation of taking the average value is as follows: if there are no data with particularly large deviations in the 10 sets of data, remove the highest value and the lowest value, and take the average value of the remaining eight sets of data; if there are data with particularly large deviations, discard the data first, and then calculate the average value through the above steps.

[0054] Table 8 Mechanical Performance Standards

[0055] Table 9 Mechanical property test results The sample width is 15mm, the thickness is calculated by actual measurement, and the length is 12.5mm.

[0056] As shown in Table 9, the force, tensile strength, elongation, and tensile strength of the hydrogel mask prepared in this application all meet the mechanical performance standards. This indicates that the experimental group samples possess sufficient resistance to breakage under normal tearing forces, supporting the mechanical needs of users in daily application. Furthermore, the lower tensile strength and moderate tensile strength of the experimental group, from a material properties perspective, support its "softer and more conforming" sensory performance.

[0057] In conjunction with Examples 2, 5-7, and Comparative Example 2, the mechanical properties of the hydrogel mask tend to decrease as the concentration of sodium alginate increases; therefore, its concentration should not be too high.

[0058] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for preparing a hydrogel facial mask material, characterized in that: It includes the following steps: S1. Preparation of base collagen solution The base collagen solution includes potassium chloride, glycerol, propylene glycol, carrageenan, glucomannan and deionized water. After the raw materials except for deionized water are evenly dispersed, deionized water is added, and the mixture is heated and stirred until the powder dissolves to obtain the base collagen solution. S2, Preparation of liquid crystal Sodium alginate was dispersed in deionized water to obtain a liquid crystal. S3, LCD loading After the base collagen solution and liquid crystal are mixed evenly, the base film solution is obtained; S4, Coating to form a film A wet film is prepared by coating the base film stock solution; S5, Pearl film backing After the wet film has cured and solidified, it is laid on the pearlescent film to obtain the laminated film; S6. Drying and Cutting The laminating film is dried to obtain a dry film, which is then cut to obtain the hydrogel mask material.

2. The method for preparing a hydrogel mask material according to claim 1, characterized in that: The weight percentages of each raw material in the base collagen solution are as follows: potassium chloride 0.1-0.5%, glycerol 2-5%, propylene glycol 1-4%, carrageenan 1-2%, glucomannan 0.5-1.5%, with the remainder being deionized water.

3. The method for preparing a hydrogel mask material according to claim 2, characterized in that: In the liquid crystal, the sodium alginate has a weight percentage of <4.5%.

4. The method for preparing a hydrogel mask material according to claim 3, characterized in that: In the liquid crystal, the sodium alginate has a weight percentage of 0.5-3.0%.

5. The method for preparing a hydrogel mask material according to claim 3, characterized in that: The feed flow ratio of the base collagen solution and the liquid crystal is (7-10):(0.5-2.5).

6. The method for preparing a hydrogel facial mask material according to claim 1, characterized in that: In the S3 liquid crystal loading step, the base collagen solution and the liquid crystal are mixed by a dynamic mixer or mechanical stirring.

7. The method for preparing a hydrogel mask material according to claim 1, characterized in that: In step S1, the powder is heated to 70-90°C and then stirred at this temperature until it dissolves.

8. A hydrogel facial mask material, characterized in that: It is prepared by the method of any one of claims 1-7 for preparing the hydrogel mask material.

9. A hydrogel face mask, characterized in that: The hydrogel mask material used is the hydrogel mask material as described in claim 8.

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