Black alginate fiber mask and preparation method thereof

Abstract

The invention relates to the field of masks, in particular to a black alginate fiber mask and a preparation method thereof.The preparation method comprises the steps of S1, S2, S3, S4 and S5, S2, superfine carbon powder is dissolved in a modifier solution, ultrasonic dispersion is performed to obtain a modified carbon powder suspension, the modified carbon powder suspension is centrifuged, then solid precipitates are collected, the solid precipitates are washed and dried, and modified carbon powder is obtained; and S3, adding the modified carbon powder into the dispersant solution, and carrying out high-speed shearing dispersion and ultrasonic treatment to obtain the modified carbon powder dispersion liquid. The carbon powder is added to adsorb grease on the skin, the sodium alginate has the effects of moisturizing, relieving and releasing mineral elements, the dual effects of purification and maintenance are achieved, then the carbon powder is modified and dispersed, the modified carbon powder can be evenly dispersed in the sodium alginate, and the skin care effect is achieved. The probability that the black color is easy to fall off and contaminates the skin and clothes is reduced.

Description

Technical Field

[0001] This application relates to the field of facial masks, and more particularly to a black seaweed fiber facial mask and a method for preparing the same. Background Technology

[0002] As consumers become increasingly skincare conscious, the functional needs of face masks, as a convenient and effective skincare product, are gradually becoming more diversified and multifaceted. Among these, cleansing and moisturizing, as the core requirements of basic skincare, have become important factors for consumers when choosing face mask products.

[0003] In existing technologies, cleansing masks often use absorbent substances such as activated charcoal to absorb oil from the skin, thus achieving a cleansing effect. However, these ingredients often have a drying effect, easily leading to moisture loss and a tight feeling after use, making it difficult to achieve a moisturizing effect. On the other hand, moisturizing masks usually use hyaluronic acid, glycerin, ceramides, etc. as their main active ingredients, replenishing moisture by forming a moisturizing film on the skin surface or penetrating deep into the skin. However, their cleansing ability is weak and cannot meet the skin's need for deep cleansing. Summary of the Invention

[0004] To achieve the dual effects of cleansing and moisturizing in a facial mask, this application provides a black seaweed fiber facial mask and its preparation method.

[0005] Firstly, this application provides a method for preparing a black seaweed fiber facial mask, which adopts the following technical solution: A method for preparing a black seaweed fiber facial mask includes the following steps: S1. Mechanically grind and filter the toner to obtain ultrafine toner; S2. Dissolve ultrafine toner in a modifier solution and disperse it by ultrasonication to obtain a modified toner suspension. Centrifuge the modified toner suspension and collect the solid precipitate. Wash and dry the solid precipitate to obtain modified toner powder. S3. Add the modified toner powder to the dispersant solution, and after high-speed shear dispersion and ultrasonic treatment, obtain the modified toner dispersion. S4. Dissolve sodium alginate powder in deionized water and stir until completely dissolved to obtain sodium alginate spinning solution. Slowly add modified carbon powder dispersion to sodium alginate spinning solution and stir continuously for 6-12 hours under light-protected conditions to obtain black sodium alginate spinning solution. S5. The black seaweed fiber spinning solution is wet-spun to obtain black sodium alginate fiber, and the black sodium alginate fiber is made into a black sodium alginate fiber mask base fabric by hydroentangling.

[0006] By adopting the above technical solution, the particle size of the toner is first refined by mechanical grinding. Then, the ultrafine toner is modified by adding a modifier. The modifier can be introduced on the surface of the toner to improve the compatibility between the toner and sodium alginate, so that the modified toner can form a stronger physical or chemical bond with the sodium alginate molecular chain, preventing the toner from falling off the sodium alginate fiber during use. Then, through "high-speed shear dispersion + ultrasonic treatment", the modified toner can form a highly uniform and stable suspension in the dispersant solution. The modified toner dispersion is then mixed with the sodium alginate spinning solution, and the black sodium alginate fiber mask base fabric is obtained by wet spinning.

[0007] This application utilizes the addition of toner to effectively absorb oil on the skin, thereby cleaning pores. Sodium alginate itself has moisturizing, soothing, and mineral-releasing effects. Through the combination of the two, a dual effect of "purification + care" is achieved. Furthermore, by modifying and dispersing the toner, the compatibility between the toner and sodium alginate is improved, allowing the modified toner to be evenly dispersed in sodium alginate. Moreover, the modified toner can be "embedded" inside the sodium alginate fibers, reducing the probability of black residue easily falling off and staining the skin and clothing.

[0008] Preferably, the modifier is at least one of dopamine, 2,3-epoxypropyltrimethylammonium chloride, and KH-550.

[0009] Preferably, the modifier is dopamine.

[0010] By employing the above technical solution, dopamine undergoes oxidative self-polymerization in a dopamine solution to generate polydopamine. The polydopamine molecule contains a large number of catechol groups, which can firmly coat the surface of the toner particles through non-covalent bonding interactions such as π-π conjugation and van der Waals forces, forming a polydopamine film. The surface of the polydopamine film is rich in active functional groups such as catechol, amino, and imino groups, transforming the originally hydrophobic toner surface into a hydrophilic and highly reactive surface capable of forming hydrogen bonds with the carboxyl groups of sodium alginate, thereby achieving strong interfacial bonding.

[0011] The molecule of 2,3-epoxypropyltrimethylammonium chloride contains epoxy groups and quaternary ammonium salt groups. The epoxy groups can undergo ring-opening reactions with the carboxyl or hydroxyl groups on the surface of the toner and be grafted onto the toner in the form of covalent bonds. At this time, the quaternary ammonium salt groups of 2,3-epoxypropyltrimethylammonium chloride will be exposed on the surface and carry a permanent positive charge, thereby generating a strong electrostatic attraction with the carboxyl groups on the sodium alginate molecular chain, so that the two can be tightly bonded together.

[0012] The KH-550 molecule contains ethoxy and amino groups. After hydrolysis, the ethoxy group generates silanol groups, which can undergo dehydration condensation with the hydroxyl groups on the surface of the toner to form a strong Si-OC covalent bond, thereby anchoring KH-550 to the surface of the toner. The amino group can form ionic bonds with the carboxyl groups on the sodium alginate molecular chain, thereby achieving a strong connection between the toner and sodium alginate.

[0013] Dopamine is a precursor to neurotransmitters that the human body can synthesize, exhibiting extremely low skin irritation and good biocompatibility. Furthermore, the polydopamine formed by the oxidative self-polymerization of dopamine creates a high-molecular-weight film on the surface of the toner, possessing a certain degree of toughness and thickness. When coated on the toner surface, it effectively adds a soft transition layer between the rigid toner particles and the flexible sodium alginate fibers, thereby reducing the brittleness of the black sodium alginate fiber mask base fabric and improving its flexibility. Therefore, dopamine is preferred as a modifier.

[0014] Preferably, the dispersant is at least one of maleic acylated chitosan and polyvinylpyrrolidone.

[0015] Preferably, the dispersant is maleylated chitosan.

[0016] By employing the above technical solution, the chitosan in maleylated chitosan contains acetyl groups and sugar rings, exhibiting a certain degree of hydrophobicity. It can be firmly adsorbed onto the surface of toner particles through hydrophobic interactions and van der Waals forces. The presence of maleyl groups brings a large number of carboxyl groups, which ionize in aqueous solution, causing the entire maleylated chitosan molecular chain to extend highly in water, forming a hydrophilic shell. Since all the modified toner particles coated with maleylated chitosan carry a negative charge, the particles are difficult to aggregate due to charge repulsion, achieving particle dispersion. Simultaneously, the hydrophilic polymer chains extending in water can also prevent particles from approaching each other through steric hindrance. Furthermore, chitosan and sodium alginate are both natural polysaccharides, but they have opposite polarities. Therefore, when negatively charged maleylated chitosan-dispersed toner is added to negatively charged sodium alginate spinning solution, no violent electrostatic interaction occurs, demonstrating good compatibility.

[0017] The strongly polar lactam ring in the polyvinylpyrrolidone (PVP) molecule can strongly adsorb onto the oxygen-containing functional groups on the toner surface through hydrogen bonding and dipole-dipole interactions. Simultaneously, its hydrophobic methylene chain can also adsorb onto the toner surface through hydrophobic interactions, thus enabling PPVP to be firmly adsorbed onto the toner particles. Furthermore, PPVP itself has good film-forming properties, capable of forming a uniform coating film on the surface of the toner particles, which helps protect the dispersion of the toner during subsequent spinning.

[0018] The carboxyl groups of maleic acid-modified chitosan can form a strong electrostatic attraction with the amino groups of dopamine, allowing the maleic acid-modified chitosan to be more firmly adsorbed onto the surface of dopamine-modified toner. The catechol hydroxyl and amino groups of dopamine can form dense hydrogen bonds with the hydroxyl and carboxyl groups of maleic acid-modified chitosan, further strengthening the binding force and preventing the dispersant from detaching from the toner surface. Simultaneously, maleic acid-modified chitosan, being a linear polysaccharide derivative with a relatively long molecular chain, can interact with the dopamine-modified layer to entwine itself on the surface of the toner, forming a composite structure of "rigid modified layer + flexible dispersant," thus enhancing the steric hindrance effect of the toner within the dispersant.

[0019] Furthermore, maleylated chitosan and sodium alginate are both natural polysaccharide derivatives with high molecular structural similarity and good compatibility. The amino group of dopamine can act as a "bridge," connecting with the carboxyl group of sodium alginate and the functional group of maleylated chitosan, respectively, further weakening the interfacial tension between the toner and sodium alginate, resulting in more uniform dispersion of the modified toner in the sodium alginate spinning solution. Therefore, maleylated chitosan is preferred as a dispersant.

[0020] Preferably, in step S2, the modified toner powder is added to a hyaluronic acid aqueous solution, stirred for 1-2 hours, and then ultrasonically treated to obtain a mixture. The mixture is then centrifuged to collect the solid precipitate, which is then washed and dried to obtain hyaluronic acid-coated modified toner powder.

[0021] By employing the aforementioned technical solution, the toner's strong adsorption properties may indiscriminately adsorb both beneficial and excess oils on the skin's surface, leading to dryness and tightness after cleansing. Hyaluronic acid, a hydrophilic linear polysaccharide with its own "hygroscopic-water-locking" ability, forms a hydrophilic buffer layer on the surface of the toner after encapsulation. This not only creates a "flexible buffer layer" between the toner and skin, reducing direct friction and physical irritation, but also reduces the adsorption of the skin's natural moisturizing factors and beneficial oils by the toner through its hydrophilic groups, making the cleansing process gentler. The porous structure of the toner also acts as a "water-retaining carrier" for hyaluronic acid, slowly releasing hyaluronic acid and bound water, upgrading the moisturizing effect from "instant hydration" to "long-lasting water retention."

[0022] Furthermore, hyaluronic acid can synergistically enhance the moisturizing effect of sodium alginate. Sodium alginate can bind to water molecules through its carboxyl groups, while the addition of hyaluronic acid can further prolong the time that moisture stays on the base fabric and skin surface, improving the skin's hydration after cleansing.

[0023] In addition, the amino and catechol hydroxyl groups on the surface of the dopamine-modified layer in the dopamine-modified toner can form hydrogen bonds and electrostatic attraction with the carboxyl groups of hyaluronic acid, allowing hyaluronic acid to be tightly wrapped around the surface of the "dopamine-toner" composite, forming a stable three-layer structure of "toner-dopamine layer-hyaluronic acid layer," preventing the coating layer from falling off during dispersion. The hyaluronic acid molecular chains are highly extended in aqueous solution, and their hydrophilic groups cause the coated toner particles to carry a negative charge on their surface, further preventing particle aggregation through the "charge repulsion effect." Simultaneously, the extended molecular chains can form a "steric barrier," ensuring the uniform dispersion of the toner particles.

[0024] Preferably, the mass ratio of the hyaluronic acid to the modified carbon powder is 7-20:1.

[0025] By adopting the above technical solution, when the proportion of hyaluronic acid is too small, a small amount of hyaluronic acid can only form a discontinuous and very thin coating film, which cannot completely cover all the toner particles. This will cause some toner particles to remain directly exposed, making the hard toner particles directly contact the stratum corneum of the skin and aggravating the irritation to the skin.

[0026] When the proportion of hyaluronic acid is too high, a large amount of hyaluronic acid will form an "overly thick hydrophilic layer" on the surface of the toner, completely enveloping the porous adsorption sites of the toner. This prevents the toner from contacting excess oil on the skin's surface, resulting in a decrease in the cleansing effect of the black seaweed fiber mask.

[0027] Preferably, the particle size of the ultrafine carbon powder is 100-500 nm.

[0028] By adopting the above technical solution, when the particle size of ultrafine toner is too large, the specific surface area per unit mass of toner will decrease sharply, resulting in a reduction of adsorption sites that can contact oils. Furthermore, large-particle toner is prone to "sedimentation and aggregation" in the spinning solution, making it impossible to mix evenly with sodium alginate molecular chains, resulting in "uneven particle size" in the spinning solution. The mask base fabric is prone to breakage during stretching and cutting. Large-particle toner will also cause "physical friction" with the stratum corneum of the skin, scratching the stratum corneum barrier and causing skin redness and stinging.

[0029] When the particle size of ultrafine toner is too small, the surface energy of the nanoparticles is extremely high, and the van der Waals forces and hydrophobic interactions between molecules are significantly enhanced. This makes the toner very prone to irreversible agglomeration in modifier solutions, dispersant solutions, and sodium alginate spinning solutions. This leads to the destruction of the uniformity of the spinning solution, the appearance of agglomerated particles inside the fibers, a decrease in the strength of the mask base fabric, and an excessively large specific surface area of ​​the toner. Its adsorption capacity will break through the "selective cleaning of excess oil" and turn into "indiscriminate adsorption", resulting in dry and tight skin.

[0030] Preferably, the mass ratio of the modified carbon powder to sodium alginate is 1:5-20.

[0031] By employing the above technical solution, when the proportion of modified toner is too high, a large number of toner particles will fill the gaps between the sodium alginate molecular chains, disrupting the "viscosity and uniformity" of the spinning solution. Furthermore, the toner particles will act as "rigid impurities," breaking the continuity of the sodium alginate molecular chains and causing the seaweed fibers to lose their flexibility. Consequently, when the mask base fabric is subsequently made using the hydroentangling method, the mask base fabric is prone to cracking and shedding during stretching, cutting, or application. Simultaneously, excessive modified toner not only strongly absorbs excess oil from the skin's surface but also absorbs a large amount of the skin's own "natural moisturizing factors" and "beneficial oils," leading to noticeable dryness, tightness, and flaking after cleansing.

[0032] When the proportion of modified toner is too small, the specific surface area and adsorption sites provided by the small amount of modified toner are very small, which cannot effectively contact and adsorb excess oil on the skin surface, let alone penetrate deep into the pores to remove oil and dirt, thus reducing the cleansing effect of the black seaweed fiber mask.

[0033] Secondly, the black seaweed fiber facial mask provided in this application adopts the following technical solution: A black seaweed fiber facial mask is prepared by the method for preparing a black seaweed fiber facial mask according to any one of claims 1-9.

[0034] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes the addition of toner to effectively absorb oil on the skin, thereby cleaning pores. Sodium alginate itself has moisturizing, soothing, and mineral-releasing effects. Through the combination of the two, a dual effect of "purification + maintenance" is achieved. Furthermore, by modifying and dispersing the toner, the compatibility between the toner and sodium alginate is improved, allowing the modified toner to be evenly dispersed in sodium alginate. Moreover, the modified toner can be "embedded" inside the sodium alginate fibers, reducing the probability of black residue easily falling off and staining the skin and clothing. 2. This application utilizes the synergistic effect between maleylated chitosan and dopamine. The carboxyl groups of maleylated chitosan can form a strong electrostatic attraction with the amino groups of dopamine, allowing maleylated chitosan to be more firmly adsorbed onto the surface of dopamine-modified toner. The catechol hydroxyl and amino groups of dopamine can form dense hydrogen bonds with the hydroxyl and carboxyl groups of maleylated chitosan, further strengthening the binding force between the two and preventing the dispersant from detaching from the toner surface. Simultaneously, maleylated chitosan, being a linear polysaccharide derivative with a relatively long molecular chain, can entwine itself on the surface of the toner through interaction with the dopamine-modified layer, forming a composite structure of "rigid modified layer + flexible dispersant," thereby enhancing the steric hindrance effect of the toner within the dispersant. 3. This application involves coating the surface of modified toner with hyaluronic acid. Hyaluronic acid is a hydrophilic linear polysaccharide with the ability to absorb and retain moisture. After coating, a hydrophilic buffer layer is formed on the surface of the toner. This not only creates a flexible buffer layer between the toner and the skin, reducing direct friction and physical irritation, but also reduces the adsorption of natural moisturizing factors and beneficial oils from the skin by the hydrophilic groups, making the cleansing process gentler. The porous structure of the toner also acts as a water-retaining carrier for hyaluronic acid, slowly releasing the hyaluronic acid and bound water, thus upgrading the moisturizing effect from "instant hydration" to "long-lasting moisture retention." Detailed Implementation

[0035] The raw materials in this application include the following: Dopamine: Uses commercially available products with CAS number 51-61-6; 2,3-Epoxypropyltrimethylammonium chloride: Use a commercially available product with CAS number 3033-77-0; KH-550: Uses a commercially available product with CAS number 919-30-2; Chitosan: The product used is a commercially available product with CAS number 9012-76-4; Maleic anhydride: Use commercially available product with CAS number 108-31-6; Dimethyl sulfoxide: Use commercially available products with CAS number 67-68-5; Polyvinylpyrrolidone: Use commercially available products with CAS number 9003-39-8; Hyaluronic acid: Uses commercially available products with CAS number 9004-61-9.

[0036] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0037] Preparation Example 1 1 g of chitosan was dissolved in 100 mL of dimethyl sulfoxide to prepare a chitosan solution; 4 g of maleic anhydride was dissolved in 10 mL of dimethyl sulfoxide to prepare a maleic anhydride solution; the maleic anhydride solution was added to the chitosan solution at a rate of 1 drop / s to carry out the acylation reaction. After reacting at 50 °C for 24 h, the pH of the solution was adjusted to 8-9 using sodium bicarbonate solution to obtain a mixed solution; anhydrous acetone was then added to the mixed solution until the product was completely precipitated. The precipitate was filtered and collected, dialyzed against deionized water for 2 days, and then freeze-dried at -50 °C for 48 h to obtain maleacylated chitosan.

[0038] Example 1 A method for preparing a black seaweed fiber facial mask includes the following steps: S1. The carbon powder is mechanically ground and filtered through a sieve to obtain ultrafine carbon powder with a particle size of 300nm. S2. Dissolve ultrafine toner in a modifier solution and disperse it by ultrasonication to obtain a modified toner suspension. Centrifuge the modified toner suspension and collect the solid precipitate. Wash and dry the solid precipitate to obtain modified toner powder. S3. Add the modified toner powder to the dispersant solution, and after high-speed shear dispersion and ultrasonic treatment, obtain the modified toner dispersion. S4. Dissolve sodium alginate powder in deionized water and stir until completely dissolved to obtain sodium alginate spinning solution. Slowly add modified carbon powder dispersion to sodium alginate spinning solution and stir continuously for 6-12 hours under light-protected conditions to obtain black sodium alginate spinning solution. S5. The black seaweed fiber spinning solution is wet-spun to obtain black sodium alginate fiber, and the black sodium alginate fiber is made into a black sodium alginate fiber mask base fabric by hydroentangling.

[0039] The modifier is dopamine, and the modifier solution is a Tris-HCl buffer solution containing 0.5% dopamine, with the pH adjusted to 8.5. The dispersant is maleylated chitosan.

[0040] Comparative Example 1 Comparative Example 1 is based on the preparation method of Example 1, but the order of S2 and S3 is changed. That is, the ultrafine carbon powder is first added to the dispersant solution, and after high-speed shear dispersion and ultrasonic treatment, a primary suspension is obtained. Then, the modifier solution is added to the primary suspension, and the mixture is stirred at 70°C for 3 hours to obtain a modified carbon powder dispersion. All other conditions remain unchanged.

[0041] Performance testing The black seaweed fiber masks of Example 1 and Comparative Example 1 were analyzed using the following specific testing methods: 1. Cleaning effect For Example 1 and Comparative Example 1, 20 volunteers aged 20 to 40 years old were selected for each group to try the product. After use, the cleansing effect of the black seaweed fiber mask was tested, with 10 points being the maximum score. The volunteers' experience was recorded.

[0042] 1. Moisturizing properties Referring to the test methods in QB / T 4256-2011 "Guidelines for Evaluation of Moisturizing Efficacy of Cosmetics", a capacitive skin moisture meter was used. After the black seaweed fiber masks of Example 1 and Comparative Example 1 were moistened with water, 30 volunteers aged 20-40 years were selected for each group to try the product. Skin moisture was tested on the volunteers before and after using the black seaweed fiber mask (three areas were measured on each volunteer's forehead and both cheeks, and the average value was taken). The moisturizing effect was expressed as skin moisture content.

[0043] 3. Toner shedding rate First, weigh the dried black seaweed fiber mask as W1. Directly rub the black seaweed fiber mask and collect the detached material. Weigh the detached material as W2. The dry toner detachment rate (%) = (M2 / M1) × 100%. The wet toner detachment rate is obtained by soaking the black seaweed fiber mask in essence for 30 minutes, draining the excess essence from the surface, weighing the mask as W3, rubbing the black seaweed fiber mask, collecting the detached material, and weighing the detached material as W4. The wet toner detachment rate (%) = (M4 / M3) × 100%.

[0044] Based on the above detection method, the test results of Example 1 and Comparative Example 1 were obtained, as shown in Table 1 below.

[0045] Table 1 Performance test results for Example 1 and Comparative Example 1 Referring to Table 1, comparing Example 1 and Comparative Example 1, it can be seen that the step of modifying and then dispersing the ultrafine toner used in this application helps to significantly improve the cleaning effect and moisturizing properties of the black seaweed fiber mask and reduce the toner shedding rate. This may be because the modification can transform the hydrophobic toner surface into a polar surface, weaken the interaction force between particles, reduce the "driving force" for toner agglomeration from the root, and make the toner dispersible. Furthermore, the modification helps to remove excess modifier in advance, reducing the impact of residual impurities on the performance of the black seaweed fiber mask.

[0046] Example 2-3 Examples 2-3 are based on the preparation method of Example 1, but the types of modifiers are adjusted, as shown in Table 1.

[0047] Performance testing The black seaweed fiber masks from Examples 1-3 were analyzed using the following specific testing methods: 1. Flexibility The flexibility of the black seaweed fiber mask was tested according to the standard test method specified in GB / T 18318.1-2009.

[0048] Based on the above detection method, the test results of Examples 1-3 were obtained, as shown in Table 1 below.

[0049] Table 2 Modifiers and Performance Test Results for Examples 1-3 Referring to Table 2, a comparison of Examples 1-3 shows that the performance of the black seaweed fiber mask in Example 1 is significantly better than that in Examples 2-3. This may be because dopamine is a precursor to a neurotransmitter that the human body can synthesize, and it has extremely low skin irritation and good biocompatibility. Furthermore, the polydopamine formed by the oxidation and self-polymerization of dopamine forms a polymer film on the surface of the toner, which has a certain toughness and thickness. When it coats the surface of the toner, it is equivalent to adding a soft transition layer between the hard toner particles and the soft sodium alginate fibers, thereby reducing the brittleness of the black sodium alginate fiber mask base fabric and improving its flexibility.

[0050] Example 4 Example 4 is based on the preparation method of Example 1, but the type of dispersant is adjusted, as shown in Table 3.

[0051] Performance testing The black seaweed fiber masks from Examples 1 and 4 were analyzed using the following specific testing methods: 1. Tensile strength The tensile strength of the black seaweed fiber mask was tested according to the standard test method specified in GB / T 3923.1-2013.

[0052] Based on the above detection method, the test results of Examples 1 and 4 were obtained, as shown in Table 1 below.

[0053] Table 3. Dispersants and performance test results for Examples 1 and 4. project Example 1 Example 4 dispersant Maleic acylated chitosan Polyvinylpyrrolidone Cleaning effect 9.4 9.1 Dry toner shedding rate (%) 94.1 92.4 Wet toner shedding rate (%) 90.4 88.5 Tensile strength (MPa) 2.8 2.4 Referring to Table 3, a comparison of Examples 1 and 4 shows that the performance of the black seaweed fiber mask in Example 1 is significantly better than that in Example 4. This may be because the carboxyl groups of maleic acid chitosan can form a strong electrostatic attraction with the amino groups of dopamine, allowing maleic acid chitosan to be more firmly adsorbed onto the surface of the dopamine-modified toner. The catechol hydroxyl and amino groups of dopamine can form dense hydrogen bonds with the hydroxyl and carboxyl groups of maleic acid chitosan, further strengthening the binding force between the two and preventing the dispersant from falling off the toner surface. Simultaneously, maleic acid chitosan is a linear polysaccharide derivative with a relatively long molecular chain, which can interact with the dopamine-modified layer to entwine around the surface of the toner, forming a composite structure of "rigid modified layer + flexible dispersant," thus enhancing the steric hindrance effect of the toner in the dispersant.

[0054] Furthermore, maleylated chitosan and sodium alginate are both natural polysaccharide derivatives with high molecular structural similarity and good compatibility. The amino group of dopamine can act as a "bridge," connecting with the carboxyl group of sodium alginate and the functional group of maleylated chitosan, respectively, further weakening the interfacial tension between the toner and sodium alginate, resulting in more uniform dispersion of the modified toner in the sodium alginate spinning solution. Therefore, maleylated chitosan is preferred as a dispersant.

[0055] Example 5 Example 5, based on the preparation method of Example 1, further includes adding modified toner powder to a hyaluronic acid aqueous solution in step S2, stirring for 2 hours, and then ultrasonically treating to obtain a mixture. The mixture is then centrifuged to collect the solid precipitate, which is then washed and dried to obtain hyaluronic acid-coated modified toner powder. The mass ratio of hyaluronic acid to modified toner powder is 15:1, and the other conditions remain unchanged.

[0056] Performance testing The black seaweed fiber masks from Examples 1 and 5 were analyzed using the following specific testing methods: 1. Anti-irritant performance test Twenty male and twenty female volunteers with sensitive skin were selected for each group. Each group of volunteers used the black seaweed fiber masks from Examples 1 and 5 for seven consecutive days, once in the morning and once in the evening. On the eighth day, the irritation level of the masks was tested, and the results are shown in Table 2. The irritation coefficient R value was calculated as 100% * number of people experiencing discomfort or allergic symptoms / number of test participants; a higher coefficient indicates stronger irritation.

[0057] Based on the above detection method, the test results of Example 1 and Example 5 were obtained, as shown in Table 1 below.

[0058] Table 4 Performance test results for Examples 1 and 5 Referring to Table 4, comparing Example 1 and Example 5, it can be seen that the addition of hyaluronic acid can significantly improve the performance of the black seaweed fiber mask. This may be because after hyaluronic acid is coated, a hydrophilic buffer layer is formed on the surface of the toner. This not only forms a "flexible buffer layer" between the toner and the skin, reducing direct friction between the toner and the skin and reducing physical irritation, but also reduces the adsorption of the skin's natural moisturizing factors and beneficial oils by the toner through the hydrophilic groups.

[0059] Furthermore, hyaluronic acid can synergistically enhance the moisturizing effect of sodium alginate. Sodium alginate can bind to water molecules through its carboxyl groups, while the addition of hyaluronic acid can further prolong the time that moisture stays on the base fabric and skin surface, improving the skin's hydration after cleansing.

[0060] Hyaluronic acid can also combine with the amino and catechol hydroxyl groups on the surface of the dopamine-modified layer in dopamine-modified toner to further promote particle dispersion.

[0061] Examples 6-9 Examples 6-9 are based on the preparation method of Example 5, but the mixing mass ratio of hyaluronic acid and modified carbon powder is adjusted as shown in Table 5.

[0062] The black seaweed fiber masks of Examples 6-9 were subjected to the above-mentioned performance tests, and the test results are shown in Table 5.

[0063] Table 5. Mixing mass ratio and performance test results of hyaluronic acid and modified carbon powder in Examples 5-9. Referring to Table 5, and comparing Examples 5-9, it can be seen that when the mass ratio of hyaluronic acid to modified carbon powder is between 7 and 20:1, especially when the mass ratio is 15:1, the resulting black seaweed fiber mask exhibits the best performance. This may be because when the proportion of hyaluronic acid is too small, a small amount of hyaluronic acid can only form a discontinuous and very thin coating film, which cannot completely cover all carbon powder particles. This results in some carbon powder particles remaining directly exposed, causing the hard carbon powder particles to directly contact the stratum corneum of the skin, exacerbating skin irritation. When the proportion of hyaluronic acid is too high, a large amount of hyaluronic acid will form an "overly thick hydrophilic layer" on the carbon powder surface, completely encapsulating the porous adsorption sites of the carbon powder. This prevents the carbon powder from contacting excess oil on the skin surface, leading to a decrease in the cleansing effect of the black seaweed fiber mask.

[0064] Examples 10-13 Examples 10-13 are based on the preparation method of Example 5, but the particle size of the ultrafine carbon powder is adjusted, as shown in Table 6.

[0065] The black seaweed fiber masks of Examples 10-13 were subjected to the above-mentioned performance tests, and the test results are shown in Table 6.

[0066] Table 6. Particle size and performance test results of ultrafine carbon powder in Examples 1 and 10-13. Referring to Table 6, a comparison of Examples 1 and 10-13 shows that the black seaweed fiber mask exhibits the best performance when the particle size of the ultrafine toner is between 100-500 nm, especially when the particle size is 300 nm. This may be because when the particle size of the ultrafine toner is too large, the specific surface area per unit mass of toner decreases sharply, leading to a reduction in adsorption sites that can contact oils. Furthermore, large-particle toner is prone to "sedimentation and aggregation" in the spinning solution, failing to mix uniformly with the sodium alginate molecular chains, resulting in "uneven particle size" in the spinning solution. Consequently, the mask base fabric is prone to breakage during stretching and cutting, and the large-particle toner will... Physical friction with the skin's stratum corneum can scratch the stratum corneum barrier, leading to redness and stinging. When the particle size of ultrafine carbon powder is too small, the surface energy of the nanoparticles is extremely high, and the van der Waals forces and hydrophobic interactions between molecules are significantly enhanced. This causes the carbon powder to easily undergo irreversible aggregation in the modifier solution, dispersant solution, and sodium alginate spinning solution, resulting in the destruction of the spinning solution's uniformity, the formation of aggregated particles within the fibers, and a decrease in the strength of the mask's base fabric. Furthermore, the excessively large specific surface area of ​​the carbon powder causes its adsorption capacity to shift from selectively cleaning excess oil to indiscriminate adsorption, leading to dry and tight skin. Examples 14-17 Examples 14-17 are based on the preparation method of Example 1, but the mixing mass ratio of modified carbon powder and sodium alginate is adjusted as shown in Table 7.

[0067] The black seaweed fiber masks of Examples 14-17 were subjected to the above-mentioned performance tests, and the test results are shown in Table 7.

[0068] Table 7. Mixing mass ratio and performance test results of modified carbon powder and sodium alginate in Examples 1 and 14-17. Referring to Table 7, a comparison of Examples 1 and 14-17 shows that when the mass ratio of modified toner to sodium alginate is between 1:5 and 20, especially when the mass ratio is 1:12, the resulting black seaweed fiber mask exhibits the best performance. This may be because when the proportion of modified toner is too high, a large number of toner particles will fill the gaps in the sodium alginate molecular chains, disrupting the "viscosity and uniformity" of the spinning solution. Furthermore, the toner particles will become "rigid impurity points," breaking the continuity of the sodium alginate molecular chains and causing the seaweed fiber to lose its flexibility. Consequently, when the mask base fabric is subsequently made using the hydroentangling method, the mask base fabric is prone to cracking and shedding during stretching, cutting, or application. Meanwhile, excessive modified toner not only strongly absorbs excess oil from the skin surface, but also absorbs a large amount of the skin's own "natural moisturizing factors" and "beneficial oils," leading to obvious dryness, tightness, and flaking after cleansing. When the proportion of modified toner is too small, the specific surface area and adsorption sites provided by a small amount of modified toner are extremely limited, making it unable to effectively contact and absorb excess oil from the skin surface, let alone penetrate deep into the pores to remove oil and dirt, thus reducing the cleansing effect of the black seaweed fiber mask. This specific embodiment is merely an explanation of this application and is not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of this application, they are protected by patent law.

Claims

1. A method for preparing a black seaweed fiber facial mask, characterized in that, Includes the following steps: S1. Mechanically grind and filter the toner to obtain ultrafine toner; S2. Dissolve ultrafine toner in a modifier solution and disperse it by ultrasonication to obtain a modified toner suspension. Centrifuge the modified toner suspension and collect the solid precipitate. Wash and dry the solid precipitate to obtain modified toner powder. S3. Add the modified toner powder to the dispersant solution, and after high-speed shear dispersion and ultrasonic treatment, obtain the modified toner dispersion. S4. Dissolve sodium alginate powder in deionized water and stir until completely dissolved to obtain sodium alginate spinning solution. Slowly add modified carbon powder dispersion to sodium alginate spinning solution and stir continuously for 6-12 hours under light-protected conditions to obtain black sodium alginate spinning solution. S5. The black seaweed fiber spinning solution is wet-spun to obtain black sodium alginate fiber, and the black sodium alginate fiber is made into a black sodium alginate fiber mask base fabric by hydroentangling.

2. The method for preparing a black seaweed fiber facial mask according to claim 1, characterized in that, The modifier is at least one of dopamine, 2,3-epoxypropyltrimethylammonium chloride, and KH-550.

3. The method for preparing a black seaweed fiber facial mask according to claim 2, characterized in that, The modifier is dopamine.

4. The method for preparing a black seaweed fiber facial mask according to claim 3, characterized in that, The dispersant is at least one of maleic acylated chitosan and polyvinylpyrrolidone.

5. The method for preparing a black seaweed fiber facial mask according to claim 4, characterized in that, The dispersant is maleylated chitosan.

6. The method for preparing a black seaweed fiber facial mask according to claim 1, characterized in that, In step S2, the modified toner powder is added to a hyaluronic acid aqueous solution, stirred for 1-2 hours, and then ultrasonically treated to obtain a mixture. The mixture is then centrifuged to collect the solid precipitate, which is then washed and dried to obtain hyaluronic acid-coated modified toner powder.

7. The method for preparing a black seaweed fiber facial mask according to claim 1, characterized in that, The mass ratio of the hyaluronic acid to the modified carbon powder is 7-20:

1.

8. The method for preparing a black seaweed fiber facial mask according to claim 1, characterized in that, The particle size of the ultrafine carbon powder is 100-500 nm.

9. The method for preparing a black seaweed fiber facial mask according to claim 1, characterized in that, The mass ratio of the modified carbon powder to sodium alginate is 1:5-20.

10. A black seaweed fiber facial mask, characterized in that, The black seaweed fiber mask is prepared by the preparation method according to any one of claims 1-9.

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