A hydroxyl-modified toughened and moisturizing spunlace mask base fabric and its preparation method

Abstract

This invention discloses a hydroxyl-modified toughened and moisturizing spunlace mask base fabric and its preparation method, belonging to the field of mask base fabric technology. It addresses the technical problem that the toughness, moisture absorption and retention properties, and water permeability and shrinkage properties of existing mask base fabrics need further improvement. The hydroxyl-modified toughened and moisturizing spunlace mask base fabric includes a skin-friendly layer, a reinforcing layer, and a liquid-retaining layer. The mask base fabric is obtained by stacking the skin-friendly layer, reinforcing layer, and liquid-retaining layer from top to bottom, fixing them with hydroentangling, and then undergoing ion beam orientation treatment. This invention, through layered composite processing of modified sodium alginate fiber, hydroxylated cotton fiber, and dopamine-modified polylactic acid fiber, combined with high-pressure hydroentangling and electric field orientation treatment, not only effectively improves the toughness and moisture absorption and retention properties of the mask base fabric, but also enhances its dimensional stability and water permeability and shrinkage properties after moisture absorption.

Description

Technical Field

[0001] This invention relates to the field of mask base fabric processing technology, specifically to a hydroxyl-modified toughened and moisturizing spunlace mask base fabric and its preparation method. Background Technology

[0002] In the cosmetics industry, facial masks are a popular and highly effective skincare product. As a core component of facial masks, the mask base fabric directly impacts the mask's effectiveness and user experience. With consumers increasingly demanding higher skincare results, higher requirements are being placed on the performance of mask base fabrics. High toughness is one of the key performance indicators for mask base fabrics. High-toughness mask base fabrics can better adapt to different face shapes and usage scenarios, and are less prone to damage during stretching and bending, improving convenience and safety. Simultaneously, high-toughness mask base fabrics can increase the contact area with the skin, improving the absorption efficiency of the essence.

[0003] In the prior art, an invention patent with publication number CN110143022A discloses a high-moisturizing elastic wet-laid spunlace mask base fabric. The mask base fabric, from bottom to top, consists of an elastic base fabric lining, a high-moisturizing filling layer, and a kapok / PP absorption and release control layer. The elastic base fabric lining is made by warp knitting nylon filaments. The high-moisturizing filling layer is composed of wood pulp / viscose, and the kapok / PP absorption and release control layer is composed of kapok / PP. The kapok fibers undergo preliminary processing... After dewaxing, the material is uniformly mixed with PP fibers and wet-laid onto a high-moisture-retaining layer. The elastic base fabric lining, high-moisture-retaining layer, and kapok / PP absorbent / release control layer are treated as a whole and reinforced with 3-5 layers of hydroentangling. Finally, the reinforced mask base fabric is dried using a combination of drying cylinder and hot air. This invention improves the tensile elasticity of the mask base fabric, ensuring the material's skin-fit; increases liquid retention, enhancing the mask's moisturizing ability; and possesses natural antibacterial and antimicrobial functions.

[0004] However, cotton fibers have limited hydrophilic groups, resulting in poor liquid absorption and retention, and a significant decrease in wet strength. Although some fibers have high water absorption, they tend to swell and expand after absorbing moisture, leading to insufficient dimensional stability of the mask base fabric. Furthermore, the inter-fiber forces mainly rely on physical entanglement; after absorbing moisture, the entanglement force decreases under the lubrication of water, reducing tensile strength. Therefore, the toughness after moisture absorption needs further improvement. Additionally, traditional mask base fabrics have weak liquid absorption and retention capabilities, meaning they cannot fully absorb and retain liquid when the mask is applied. The traditional mask's base fabric has a non-directional, irregular arrangement of hydroxyl groups, causing moisture to evaporate easily during use and preventing it from retaining sufficient moisture and nutrients for the skin. This reduces the mask's effectiveness. Furthermore, the hydroxyl groups on the base fabric are easily lost during use, preventing the mask from retaining moisture and reducing the activity of the essence. In summer, sweat from the skin can accumulate between the skin and the mask, creating a stuffy, hot, and unbreathable feeling, which negatively impacts the mask's application experience.

[0005] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a hydroxyl-modified toughened and moisturizing spunlace mask base fabric and its preparation method, which solves the technical problem that the toughness, liquid absorption and moisturizing performance and moisture permeability and shrinkage performance of mask base fabrics in the prior art need to be further improved.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A hydroxyl-modified toughened and moisturizing spunlace mask base fabric includes a skin-friendly layer, a reinforcing layer and a liquid-retaining layer. The mask base fabric is obtained by stacking the skin-friendly layer, the reinforcing layer and the liquid-retaining layer from top to bottom and fixing them by spunlace, and then undergoing ion beam orientation treatment.

[0009] The skin-friendly layer is composed of hydroxylated cotton fibers at a concentration of 10-12 g / m². 2 After being laid out, the mesh is rolled into shape under a pressure of 0.1-0.2 kPa.

[0010] The reinforcing layer is made of dopamine-modified polylactic acid fiber at a concentration of 18-22 g / m². 2 After being laid out, the mesh is rolled into shape under a pressure of 0.1-0.2 kPa.

[0011] The liquid-retaining layer is a blend of hydroxylated cotton fiber and modified sodium alginate-based fiber in a weight ratio of 1:(3-4) at a concentration of 35-45 g / m³. 2After being laid out, the fiber is rolled into shape under a pressure of 0.1-0.2 kPa. The modified sodium alginate-based fiber is prepared by wet spinning of a spinning solution, which includes modified sodium alginate, silk fibroin, and collagen peptides.

[0012] The preparation method of modified sodium alginate is as follows: Sodium alginate, accelerator, and deionized water are mixed, the reaction system temperature is raised to 60-70℃, and stirred for 80-100 min. An emulsion is added to the reaction system, and the mixture is stirred for 20-30 min. Then, a shell solution is added to the reaction system, and the reaction is kept at the temperature for 90-120 min. After post-treatment, core-shell modified sodium alginate is obtained. Alternatively, core-shell modified sodium alginate, 80 vol% ethanol aqueous solution, and triethoxysilylbutyraldehyde are mixed and stirred, the reaction system temperature is raised to 45-55℃, and the reaction is kept at the temperature for 140-160 min. After post-treatment, modified sodium alginate is obtained.

[0013] The synthesis reaction mechanism of modified sodium alginate is as follows:

[0014] During the reaction, nano-calcium carbonate can react with the -COO group on the sodium alginate chain. - The group undergoes coordination / ion exchange, partially replacing the original Na. + Forming ionic crosslinking points enhances fiber strength and structural stability; glycerol acts as a plasticizer and dispersant, improving calcium content. 2+ The dispersion of sodium alginate and the formation of hydrogen bonds with hydroxyl groups reduce hardness and brittleness. In an emulsified environment, sodium alginate emulsifies to form emulsion particles. In the shell solution, tetraethyl orthosilicate and glycidyltrimethoxysilane undergo hydrolysis and condensation to form a Si-O-Si network, which is then covalently bonded to sodium alginate through epoxy ring-opening to form core-shell modified sodium alginate. Triethoxysilylbutyraldehyde undergoes hydrolysis and condensation to form aldehyde groups on the core-shell modified sodium alginate particles, thus preparing modified sodium alginate.

[0015] Furthermore, the preparation method of hydroxylated cotton fiber is as follows: cotton fiber and sodium hydroxide solution are mixed, the temperature of the reaction system is raised to 70-80℃, and the mixture is kept at this temperature for 40-60 min. Epichlorohydrin is added to the reaction system, and the reaction is kept at this temperature for 2-3 h. 1-Amino-1-deoxy-D-arabinitol is added to the reaction system, and the reaction is kept at this temperature for 60-80 min. After treatment, hydroxylated cotton fiber is obtained.

[0016] The synthesis mechanism of hydroxylated cotton fibers is as follows:

[0017]

[0018] In the formula, the value of n ranges from 6000 to 11000;

[0019] The main component of cotton fiber is cellulose. During the reaction, the hydroxyl groups present in the cellulose molecules will disrupt the intramolecular and intermolecular hydrogen bond network under alkaline conditions, making the structure of cellulose loose and increasing its reactivity. This causes lone pairs of electrons to form on the oxygen atoms of the hydroxyl groups in the cotton fiber molecules, giving them strong nucleophilicity. They undergo ring-opening condensation with epichlorohydrin to form an intermediate product. Under alkaline conditions, the chlorine atom in the intermediate product undergoes an elimination reaction with the hydroxyl groups on its molecules to form an epoxy group, while simultaneously generating the byproduct hydrochloric acid. Then, the epoxy group undergoes ring-opening condensation with the amino group on the 1-amino-1-deoxy-D-arabinitol molecule to prepare hydroxylated cotton fibers modified with multiple hydroxyl groups.

[0020] Furthermore, the ratio of cotton fiber, sodium hydroxide solution, epichlorohydrin, and 1-amino-1-deoxy-D-arabinitol is 10g:500mL:(1.2-1.5g):3g, the concentration of sodium hydroxide solution is 8-9mol / L, and the post-treatment includes: after the reaction is completed, the temperature of the reaction system is lowered to room temperature, filtered, the filter cake is washed with purified water until neutral and then dried, the filter cake is transferred to a drying oven at a temperature of 60-70℃ and dried to constant weight to obtain hydroxylated cotton fiber.

[0021] Furthermore, the preparation method of dopamine-modified polylactic acid fiber is as follows: dopamine hydrochloride and buffer solution are mixed and stirred until the system is dissolved, polylactic acid fiber is added to the reaction system, the temperature of the reaction system is raised to 40-50℃, the reaction is kept at the temperature for 4-6 hours, and then post-treatment is performed to obtain dopamine-modified polylactic acid fiber.

[0022] The synthesis reaction mechanism of dopamine-modified polylactic acid fiber is as follows:

[0023] During the reaction, dopamine undergoes self-polymerization and deposition under weakly alkaline conditions to form polydopamine, which is then deposited on the surface of polylactic acid fibers, resulting in dopamine-modified polylactic acid fibers.

[0024] Furthermore, the ratio of dopamine hydrochloride, buffer solution, and polylactic acid fiber is (2-3g):80mL:7g, the buffer solution is a 0.1mol / L Tirs-HCl solution with pH=8.5, and the post-treatment includes: after the reaction is completed, the temperature of the reaction system is lowered to room temperature, filtered, the filter cake is washed with purified water until neutral and then dried, the filter cake is transferred to a drying oven at a temperature of 70-80℃ and dried to constant weight to obtain dopamine-modified polylactic acid fiber.

[0025] Furthermore, the modified sodium alginate-based fiber is obtained by the following steps:

[0026] A1. Mix modified sodium alginate, silk fibroin, collagen peptides and sodium hydroxide solution, raise the temperature of the reaction system to 50-60℃, keep the reaction at this temperature for 2-3 hours, and then perform post-treatment to obtain the spinning solution.

[0027] A2. Add the spinning solution to the spinning needle tube, set the gap between the spinning needle tube and the surface of the coagulation bath to be 15-25 mm, and extrude the spinning solution into the coagulation bath at 0.2-0.3 mL / min to solidify. After post-treatment, the modified sodium alginate-based fiber is obtained.

[0028] The synthesis reaction mechanism of modified sodium alginate-based fibers is as follows:

[0029] During the reaction, the aldehyde groups on the modified sodium alginate molecules cross-link with the amino and imino groups on the silk fibroin or collagen peptide molecules, forming a coating of silk fibroin or collagen peptide molecules on the outside of the modified sodium alginate molecules.

[0030] Further, in step A1, the ratio of the modified sodium alginate, silk fibroin, collagen peptide, and sodium hydroxide solution is (10-12g):(7-8g):(4-5g):90mL, and the concentration of the sodium hydroxide solution is 1.2-1.5mol / L. The post-treatment includes: after the reaction is completed, the temperature of the reaction system is lowered to room temperature, hydrochloric acid is added to the reaction system to adjust the pH of the system to 7, and the system is allowed to stand to remove bubbles to obtain the spinning solution.

[0031] Further, in step A2, the inner diameter of the spinning needle is 80-100 μm, the coagulation bath is composed of calcium chloride, anhydrous ethanol and deionized water in the ratio of (3-5 g):(25-28 mL):(80-90 mL), the temperature of the coagulation bath is 25-30℃, the curing time of the coagulation bath is 60-80 s, and the post-treatment includes: after curing, the fiber is taken out of the coagulation bath, washed 3 times with deionized water, wet-stretched at 1.3-1.5 times, and then transferred to a drying oven at a temperature of 70-80℃ to dry to constant weight, cut, and obtained modified sodium alginate-based fibers with a length of 3-8 mm.

[0032] Furthermore, the ratio of sodium alginate, accelerator, deionized water, emulsion, and shell solution is 5g:(0.1-0.2g):500mL:500mL:(2.5-3g). The accelerator is composed of nano-calcium carbonate and glycerol in a weight ratio of 1:3. The emulsion is composed of isopropanol, Span-80, sodium dodecylbenzenesulfonate, and gluconolactone in a ratio of 100mL:(2-3g):(1-2g):0.12g. The shell solution is composed of tetraethyl orthosilicate and glycidyltrimethoxysilane in a weight ratio of 3:1. The emulsification stirring speed is 8000-10000 r / min. The post-treatment includes: after the reaction is completed, the temperature of the reaction system is reduced to room temperature, allowed to stand and age for 20-22 h, filtered, the filter cake is washed 3 times with purified water and then dried, the filter cake is transferred to a drying oven at a temperature of 70-80℃ and dried to constant weight to obtain core-shell modified sodium alginate.

[0033] Furthermore, the ratio of the core-shell modified sodium alginate, 80 vol% ethanol aqueous solution, and triethoxysilyl butyraldehyde is 10 g: 500 mL: (1.5-1.7 g). The post-treatment includes: after the reaction is completed, the temperature of the reaction system is lowered to room temperature, anhydrous ethanol is added to the reaction system, the mixture is stirred and dispersed for 20-30 min, filtered, and the filter cake is transferred to a drying oven at a temperature of 60-70℃ and vacuum dried to constant weight to obtain modified sodium alginate.

[0034] A method for preparing a hydroxyl-modified toughened and moisturizing spunlace mask base fabric includes the following steps:

[0035] S1. After stacking the skin-friendly layer, the reinforcing layer and the liquid-retaining layer from top to bottom, wet them, and then use multiple high-pressure hydroentangling on both sides to fix them. After negative pressure suction, remove excess water and transfer the fiber web to a drying oven at a temperature of 70-80℃. Dry it to constant weight to obtain the hydroentangled mask base fabric blank.

[0036] S2. Lay the spunlace mask base fabric blank with a water content of 20-30wt% between two electrode plates with the skin-friendly layer facing up. Use the electrode plate under the spunlace mask base fabric blank as the negative electrode and the electrode plate on the spunlace mask base fabric blank as the positive electrode. Apply direct current to the two electrode plates to form a direct current electric field between the two electrode plates. Maintain the treatment for 20-30 minutes, cool down and dry to constant weight to obtain the spunlace mask base fabric.

[0037] The ion beam directional treatment molding mechanism of spunlace mask base fabric is as follows:

[0038] During the ion beam orientation process, the bottom of the spunlace mask base fabric is attached to the negative electrode. Under the influence of a DC electric field, the ion beam in the electric field lines points from the positive electrode to the negative electrode, causing the hydroxyl oxygen atoms in the base fabric to be attracted by the negative electrode, forming a negative charge accumulation layer. The hydroxyl hydrogen atoms on the surface of the base fabric are attracted by the positive electrode, forming a positive charge accumulation layer. An electric potential gradient from the positive electrode to the negative electrode is formed inside the base fabric, driving the hydroxyl groups to migrate along the direction of the electric field. This results in the hydroxyl groups on the spunlace mask base fabric exhibiting an overall directional arrangement from the skin-friendly layer towards the liquid-retaining layer, thus preparing the spunlace mask base fabric.

[0039] Furthermore, in step S1, the forward and reverse multi-stage high-pressure channels are as follows: the first channel is a forward-facing hydroentangled channel with a water pressure of 25-30 bar; the second channel is a reverse-facing hydroentangled channel with a water pressure of 35-60 bar; the third channel is a forward-facing hydroentangled channel with a water pressure of 35-60 bar; the fourth channel is a reverse-facing hydroentangled channel with a water pressure of 40-50 bar; the fifth channel is a forward-facing hydroentangled channel with a water pressure of 60-80 bar; and the sixth channel is a reverse-facing hydroentangled channel with a water pressure of 55-65 bar.

[0040] Furthermore, in step S2, the bottom of the spunlace mask base fabric is attached to the top of the negative electrode plate, the distance between the top of the spunlace mask base fabric and the positive electrode plate is 8-12mm, and the DC electric field strength between the two electrode plates is 1.3-1.6MV / m.

[0041] The present invention has the following beneficial effects:

[0042] 1. This invention uses a combination of a skin-friendly layer, a reinforcing layer, and a liquid-retaining layer, which are then fixed with hydroentanglement and subjected to ion beam orientation treatment. This causes a large number of hydroxyl groups on the mask base fabric to align with the liquid-retaining layer, making it easier for moisture to permeate from the skin-friendly layer to the liquid-retaining layer. This also allows moisture evaporated from the skin during application to more easily pass through the mask fabric, preventing localized liquid accumulation between the skin and the mask that could cause stuffiness, heat, or a feeling of not being able to breathe. Excess moisture is directed to the air side for expulsion, while the essence remains on the skin side, continuously releasing and fully contacting the skin. In the air side, the essence and moisture are blocked and do not easily evaporate. The skin-friendly layer is made of hydroxylated cotton fibers, which increases the number of hydroxyl groups on the cotton fibers, enhancing the hydrogen bonding between the skin-friendly layer and the skin surface, making it more closely adhered to the skin, reducing gaps, and improving the penetration rate of the essence.

[0043] 2. This invention uses a skin-friendly layer, a reinforcing layer, and a liquid-retaining layer stacked from top to bottom to form the mask base fabric. The skin-friendly layer directly contacts the skin, providing a comfortable feel. The reinforcing layer uses dopamine-modified polylactic acid fiber, which has high strength and modulus, effectively resisting external tensile forces and preventing deformation of the mask base fabric. The liquid-retaining layer is a blend of hydroxylated cotton fiber and modified sodium alginate-based fiber, possessing excellent liquid absorption and retention properties. Simultaneously, the interaction between fibers helps maintain the stability of the layer structure. This layered structure allows each layer to complement each other's functions, collectively improving the overall dimensional stability of the mask base fabric. The fibers in each layer are evenly distributed during the web-laying process, and then rolled to form a tight arrangement and intertwining of the fibers, creating a stable three-dimensional network structure. This effectively disperses external forces, reduces local stress concentration, and prevents fiber slippage and dimensional changes. Multiple high-pressure hydroentangling passes are used for fixation, with the water pressure gradually increasing in each pass. This progressive hydroentangling method makes the bonding between fibers tighter and more uniform, forming a robust fiber network structure. Meanwhile, the high-pressure water flow during the hydroentangling process can comb and orient the fibers, further improving the fiber orientation and structural stability, and reducing the shrinkage or expansion of the mask base fabric during hydroentangling and drying.

[0044] 3. This invention prepares modified sodium alginate by using sodium alginate as a raw material, modifying its core-shell structure, and then modifying it with aldehyde groups. This modified sodium alginate is then mixed with silk fibroin and collagen peptides. The β-sheet crystalline region of silk fibroin provides high modulus, while the amorphous region imparts elasticity, forming a "hard-soft" phase separation structure with sodium alginate, thus improving the fiber's impact resistance. The triple helix structure of collagen peptides interacts with the hydrogen bonds of sodium alginate, enhancing the interfacial bonding force of the fiber, reducing stress concentration points, and improving the performance of the modified sodium alginate-based fiber. Toughness: After silk fibroin and collagen peptides bond with the aldehyde groups on the modified sodium alginate particles, they form a chemically bonded cross-linked network, which further enhances the toughness of the modified sodium alginate-based fibers. By coating the outside of sodium alginate, the movement of molecular chains can be effectively restricted, reducing water absorption and swelling. Silk fibroin and collagen peptides have good hygroscopic and moisturizing properties and can form a hygroscopic and moisturizing system with modified sodium alginate. While improving the hygroscopic and moisturizing properties of modified sodium alginate-based fibers, the dimensional stability of the fiber material is also improved.

[0045] 4. This invention modifies polylactic acid (PLA) fibers by depositing polydopamine, introducing a large number of catechol and amino groups onto the PLA fibers. These groups form strong hydrogen bonds with the active groups such as hydroxyl groups on cotton fibers or modified sodium alginate-based fibers, resulting in a tighter bond between fibers and a more stable fiber network structure. This effectively resists external stretching and deformation, reduces fiber slippage, and maintains the dimensional stability of the mask base fabric. In the mask base fabric, hydroxylated cotton fibers provide a certain degree of softness and hydrophilicity, while dopamine-modified PLA fibers enhance the strength and stability of the structure and assist in the transfer and diffusion of moisture within the mask base fabric. Modified sodium alginate-based fibers further enrich the performance of the fiber network. This synergistic effect allows the mask base fabric to better maintain its size and shape when subjected to external forces or environmental changes, improving dimensional stability. It also remains intact and less prone to breakage when subjected to external stretching or bending, improving the comfort and resilience of the mask. The synergistic effect of multiple fiber groups also enables rapid absorption, even distribution, and long-term retention of moisture, thus providing a good moisturizing environment for the skin. Detailed Implementation

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In this invention, polylactic acid fiber is a commercially available material selected from Jiangsu Wanrun New Material Technology Co., Ltd., under the brand name Wanrun, with a fineness of 2-5D and a length of 18-34mm.

[0048] In this invention, the silk fibroin is a commercially available material, selected from Hubei Maidehao Biotechnology Co., Ltd., with product number Maidehao MDH2549, an effective ingredient content of 90%, and conforms to the national standard.

[0049] In this invention, the collagen peptides are commercially available materials selected from Xi'an Tianfeng Biotechnology Co., Ltd., with an effective ingredient content of 90% and a food-grade raw material level.

[0050] In this invention, the cotton fiber is pure cotton wadding from Xinjiang, selected from Shandong Aorong Garment Co., Ltd., brand name Aobo, product name pure cotton wadding, width 1-3.2m, thickness 3-30mm, roll length 40-100m;

[0051] In this invention, the nano-calcium carbonate is a commercially available material selected from Shijiazhuang Supermicro New Materials Technology Co., Ltd., with a purity of 99.9%, a particle size of 0.005 mm, a content of 99.9%, a particle size of 10 μm, and a density of 1.7 g / cm³. 3 ;

[0052] In this invention, glycerol is glycerol, CAS number 56-81-5;

[0053] In this invention, sodium alginate is a commercially available material selected from Guangzhou Huayu Biotechnology Co., Ltd., with an effective ingredient content of 99%, a food grade, and conforming to national standards.

[0054] Example 1

[0055] This embodiment provides a method for preparing modified sodium alginate-based fibers, including the following steps:

[0056] Step 1: Preparation of core-shell modified sodium alginate

[0057] Nano-calcium carbonate and glycerol are mixed in a weight ratio of 1:3 to obtain an accelerator;

[0058] Isopropanol, Span-80, sodium dodecylbenzenesulfonate and gluconolactone were mixed evenly at a ratio of 100 mL: 2 g: 1 g: 0.12 g to obtain an emulsion;

[0059] Tetraethyl orthosilicate and glycidyltrimethoxysilane were mixed evenly at a weight ratio of 3:1 to obtain a shell solution.

[0060] Weigh out 50g of sodium alginate, 1g of accelerator, and 5000mL of deionized water and add them to a reaction flask. Stir the mixture and raise the temperature of the reaction flask to 60℃. Stir for 80min. Add 5000mL of emulsion to the reaction flask and set the stirring speed to 10000r / min. Emulsify and disperse for 20min. Then add 25g of shell solution to the reaction flask and keep it at the temperature for 90min. Lower the temperature of the reaction flask to room temperature and let it stand for 20h. Filter the mixture and wash the filter cake three times with purified water. Dry the filter cake and transfer it to a drying oven at 70℃. Dry it to constant weight to obtain core-shell modified sodium alginate.

[0061] Step 2: Preparation of modified sodium alginate

[0062] Weigh out 50g of core-shell modified sodium alginate, 2500mL of 80vol% ethanol aqueous solution and 7.5g of triethoxysilylbutyraldehyde and add them to the reaction flask. Stir the mixture and raise the temperature of the reaction flask to 45℃. Keep the temperature at this temperature for 140min. Lower the temperature of the reaction flask to room temperature and add 1000mL of anhydrous ethanol to the reaction flask. Stir and disperse for 20min. Filter the mixture and transfer the filter cake to a drying oven at 60℃. Dry the cake under vacuum to constant weight to obtain modified sodium alginate.

[0063] Step 3: Prepare spinning solution

[0064] Weigh out 50g of modified sodium alginate, 35g of silk fibroin, 20g of collagen peptide, and 450mL of 1.2mol / L sodium hydroxide solution and add them to the reaction flask. Stir the mixture and raise the temperature of the reaction flask to 50℃. Keep the mixture at this temperature for 2 hours. Then lower the temperature of the reaction flask to room temperature and add 2mol / L hydrochloric acid to the reaction flask to adjust the pH of the system to 7. Let the mixture stand to remove bubbles and obtain the spinning solution.

[0065] Step 4: Preparation of modified sodium alginate-based fibers

[0066] Calcium chloride, anhydrous ethanol and deionized water were mixed evenly at a ratio of 3g:25mL:80mL to obtain a coagulation bath.

[0067] The spinning solution was added into a spinning needle with an inner diameter of 80 μm. The gap between the spinning needle and the surface of the coagulation bath was set to 15 mm. The spinning solution was extruded into a coagulation bath at a temperature of 25 °C at a rate of 0.2 mL / min and solidified for 60 s. The fiber was taken out of the coagulation bath, washed three times with deionized water, wet-stretched at a ratio of 1.3, and then transferred to a drying oven at a temperature of 70 °C to dry to constant weight. The fiber was then cut to obtain modified sodium alginate-based fibers with a length of 3-8 mm.

[0068] Example 2

[0069] This embodiment provides a method for preparing modified sodium alginate-based fibers, including the following steps:

[0070] Step 1: Preparation of core-shell modified sodium alginate

[0071] Nano-calcium carbonate and glycerol are mixed in a weight ratio of 1:3 to obtain an accelerator;

[0072] Isopropanol, Span-80, sodium dodecylbenzenesulfonate and gluconolactone were mixed evenly at a ratio of 100 mL: 2.5 g: 1.5 g: 0.12 g to obtain an emulsion;

[0073] Tetraethyl orthosilicate and glycidyltrimethoxysilane were mixed evenly at a weight ratio of 3:1 to obtain a shell solution.

[0074] Weigh out 50g of sodium alginate, 1.5g of accelerator, and 5000mL of deionized water and add them to a reaction flask. Stir the mixture and raise the temperature of the reaction flask to 65℃. Stir for 90min. Add 5000mL of emulsion to the reaction flask and set the stirring speed to 9000r / min. Emulsify and disperse for 25min. Then add 27g of shell solution to the reaction flask and keep it at the temperature for 105min. Lower the temperature of the reaction flask to room temperature and let it stand for 21h. Filter the mixture and wash the filter cake three times with purified water. Dry the filter cake and transfer it to a drying oven at 75℃. Dry it to constant weight to obtain core-shell modified sodium alginate.

[0075] Step 2: Preparation of modified sodium alginate

[0076] Weigh out 50g of core-shell modified sodium alginate, 2500mL of 80vol% ethanol aqueous solution and 8g of triethoxysilylbutyraldehyde and add them to the reaction flask. Stir and raise the temperature of the reaction flask to 50℃ and keep it at that temperature for 150min. Then lower the temperature of the reaction flask to room temperature, add 1000mL of anhydrous ethanol to the reaction flask, stir and disperse for 25min, filter, and transfer the filter cake to a drying oven at 65℃. Dry it under vacuum to constant weight to obtain modified sodium alginate.

[0077] Step 3: Prepare spinning solution

[0078] Weigh out 55g of modified sodium alginate, 37g of silk fibroin, 23g of collagen peptide, and 450mL of 1.4mol / L sodium hydroxide solution and add them to the reaction flask. Stir the mixture and raise the temperature of the reaction flask to 55℃. Keep the mixture at this temperature for 2.5h. Then lower the temperature of the reaction flask to room temperature and add 2.5mol / L hydrochloric acid to the reaction flask to adjust the pH of the system to 7. Let the mixture stand to remove bubbles and obtain the spinning solution.

[0079] Step 4: Preparation of modified sodium alginate-based fibers

[0080] Calcium chloride, anhydrous ethanol and deionized water were mixed evenly at a ratio of 4g:26mL:85mL to obtain a coagulation bath.

[0081] The spinning solution was added into a spinning needle with an inner diameter of 90 μm. The gap between the spinning needle and the surface of the coagulation bath was set to 20 mm. The spinning solution was extruded into a coagulation bath at a temperature of 27 °C at a rate of 0.25 mL / min and solidified for 70 s. The fiber was taken out of the coagulation bath, washed three times with deionized water, wet-stretched at a ratio of 1.4, and then transferred to a drying oven at a temperature of 75 °C to dry to constant weight. The fiber was then cut to obtain modified sodium alginate-based fibers with a length of 3-8 mm.

[0082] Example 3

[0083] This embodiment provides a method for preparing modified sodium alginate-based fibers, including the following steps:

[0084] Step 1: Preparation of core-shell modified sodium alginate

[0085] Nano-calcium carbonate and glycerol are mixed in a weight ratio of 1:3 to obtain an accelerator;

[0086] Isopropanol, Span-80, sodium dodecylbenzenesulfonate and gluconolactone were mixed evenly at a ratio of 100 mL: 3 g: 2 g: 0.12 g to obtain an emulsion;

[0087] Tetraethyl orthosilicate and glycidyltrimethoxysilane were mixed evenly at a weight ratio of 3:1 to obtain a shell solution.

[0088] Weigh out 50g of sodium alginate, 2g of accelerator, and 5000mL of deionized water and add them to a reaction flask. Stir the mixture and raise the temperature of the reaction flask to 70℃. Stir for 100min. Add 5000mL of emulsion to the reaction flask and set the stirring speed to 8000r / min. Emulsify and disperse for 30min. Then add 30g of shell solution to the reaction flask and keep it at the temperature for 120min. Lower the temperature of the reaction flask to room temperature and let it stand for 22h. Filter the mixture and wash the filter cake three times with purified water. Dry the filter cake and transfer it to a drying oven at 80℃. Dry it to constant weight to obtain core-shell modified sodium alginate.

[0089] Step 2: Preparation of modified sodium alginate

[0090] Weigh out 50g of core-shell modified sodium alginate, 2500mL of 80vol% ethanol aqueous solution and 8.5g of triethoxysilylbutyraldehyde and add them to the reaction flask. Stir the mixture and raise the temperature of the reaction flask to 55℃. Keep the mixture at this temperature for 160min. Lower the temperature of the reaction flask to room temperature and add 1000mL of anhydrous ethanol to the reaction flask. Stir and disperse the mixture for 30min. Filter the mixture and transfer the filter cake to a drying oven at 70℃. Dry the cake under vacuum until constant weight to obtain modified sodium alginate.

[0091] Step 3: Prepare spinning solution

[0092] Weigh out 60g of modified sodium alginate, 40g of silk fibroin, 25g of collagen peptide, and 450mL of 1.5mol / L sodium hydroxide solution and add them to the reaction flask. Stir the mixture and raise the temperature of the reaction flask to 60℃. Keep the mixture at this temperature for 3 hours. Then lower the temperature of the reaction flask to room temperature and add 3mol / L hydrochloric acid to the reaction flask to adjust the pH of the system to 7. Let the mixture stand to remove bubbles and obtain the spinning solution.

[0093] Step 4: Preparation of modified sodium alginate-based fibers

[0094] Calcium chloride, anhydrous ethanol and deionized water were mixed evenly at a ratio of 5g:28mL:90mL to obtain a coagulation bath.

[0095] The spinning solution was added into a spinning needle with an inner diameter of 100 μm. The gap between the spinning needle and the surface of the coagulation bath was set to 25 mm. The spinning solution was extruded into a coagulation bath at a temperature of 30 °C at a rate of 0.3 mL / min and solidified for 80 s. The fiber was taken out of the coagulation bath, washed three times with deionized water, wet-stretched at a ratio of 1.5, and then transferred to a drying oven at a temperature of 80 °C to dry to constant weight. The fiber was then cut to obtain modified sodium alginate-based fibers with a length of 3-8 mm.

[0096] Example 4

[0097] This embodiment provides a method for preparing a hydroxyl-modified toughened and moisturizing spunlace mask base fabric, including the following steps:

[0098] Step 1: Preparation of hydroxylated cotton fibers

[0099] Weigh out 100g of cotton fiber and 5000mL of 8mol / L sodium hydroxide solution and add them to a reaction flask for impregnation. Raise the temperature of the reaction flask to 70℃ and keep it at this temperature for 40min. Stir the mixture and add 12g of epichlorohydrin to the reaction flask. Keep the mixture at this temperature for 2h. Add 30g of 1-amino-1-deoxy-D-arabinitol to the reaction flask and keep the mixture at this temperature for 60min. Lower the temperature of the reaction flask to room temperature, filter the mixture, wash the filter cake with purified water until neutral, and then dry it. Transfer the filter cake to a drying oven at 60℃ and dry it to constant weight to obtain hydroxylated cotton fiber.

[0100] Step 2: Preparation of dopamine-modified polylactic acid fibers

[0101] Weigh out 20g of dopamine hydrochloride and 800mL of 0.1mol / L Tirs-HCl solution (pH=8.5) and add them to a reaction flask. Stir until the system is dissolved. Add 70g of polylactic acid fiber to the reaction flask. Raise the temperature of the reaction flask to 40℃ and keep it at that temperature for 4h. Then lower the temperature of the reaction flask to room temperature, filter, wash the filter cake with purified water until neutral, and then dry it. Transfer the filter cake to a drying oven at 70℃ and dry it to constant weight to obtain dopamine-modified polylactic acid fiber.

[0102] Step 3: Prepare the spunlace mask base fabric blank

[0103] Hydroxylated cotton fibers at 10g / m 2 After the mesh is laid, it is rolled at 0.1 kPa to obtain the skin-friendly layer;

[0104] Dopamine-modified polylactic acid fiber was applied at 18 g / m². 2 After the mesh is laid, it is rolled at 0.1 kPa to obtain the reinforcing layer;

[0105] A blended fiber composed of hydroxylated cotton fiber and modified sodium alginate-based fiber prepared in Example 1 at a weight ratio of 1:3;

[0106] The blended fiber is 35g / m 2 After the mesh is laid, it is rolled at 0.1 kPa to obtain the liquid-retaining layer;

[0107] After layering the skin-friendly layer, reinforcing layer, and liquid-retaining layer from top to bottom, the fabric is moistened to a moisture content of 80%. Then, it undergoes multiple high-pressure hydroentangling processes on both sides for fixation. Excess moisture is removed by negative pressure suction, and the fiber web is transferred to a drying oven at 70°C and dried to constant weight to obtain the hydroentangled mask base fabric preform. The first hydroentangling process is on the front side at a water pressure of 25 bar; the second is on the back side at a water pressure of 35 bar; the third is on the front side at a water pressure of 35 bar; the fourth is on the back side at a water pressure of 40 bar; the fifth is on the front side at a water pressure of 60 bar; and the sixth is on the back side at a water pressure of 55 bar.

[0108] Step 4: Prepare the base fabric for the spunlace mask.

[0109] A spunlace mask base fabric blank with a water content of 20wt% was laid flat between two electrode plates with the skin-friendly layer facing upwards. The electrode plate under the spunlace mask base fabric blank was used as the negative electrode, and the electrode plate on the spunlace mask base fabric blank was used as the positive electrode. The bottom of the spunlace mask base fabric blank was attached to the top of the negative electrode plate, and the distance between the top of the spunlace mask base fabric blank and the positive electrode plate was 8mm. A direct current was applied to the two electrode plates to form a direct current electric field with an electric field strength of 1.6MV / m between the two electrode plates. The treatment was maintained for 20min, and after cooling, it was dried to constant weight to obtain the spunlace mask base fabric.

[0110] Example 5

[0111] This embodiment provides a method for preparing a hydroxyl-modified toughened and moisturizing spunlace mask base fabric, including the following steps:

[0112] Step 1: Preparation of hydroxylated cotton fibers

[0113] Weigh out 100g of cotton fiber and 5000mL of 8.5mol / L sodium hydroxide solution and add them to a reaction flask for impregnation. Raise the temperature of the reaction flask to 75℃ and keep it at this temperature for 50min. Stir the mixture and add 13.5g of epichlorohydrin to the reaction flask. Keep the mixture at this temperature for 2.5h. Add 30g of 1-amino-1-deoxy-D-arabinitol to the reaction flask and keep the mixture at this temperature for 70min. Lower the temperature of the reaction flask to room temperature, filter the mixture, wash the filter cake with purified water until neutral, and then dry it. Transfer the filter cake to a drying oven at 65℃ and dry it to constant weight to obtain hydroxylated cotton fiber.

[0114] Step 2: Preparation of dopamine-modified polylactic acid fibers

[0115] Weigh out 25g of dopamine hydrochloride and 800mL of 0.1mol / L Tirs-HCl solution (pH=8.5) and add them to a reaction flask. Stir until the system is dissolved. Add 70g of polylactic acid fiber to the reaction flask. Raise the temperature of the reaction flask to 45℃ and keep it at that temperature for 5h. Then lower the temperature of the reaction flask to room temperature, filter, wash the filter cake with purified water until neutral, and then dry it. Transfer the filter cake to a drying oven at 75℃ and dry it to constant weight to obtain dopamine-modified polylactic acid fiber.

[0116] Step 3: Prepare the spunlace mask base fabric blank

[0117] Hydroxylated cotton fibers were processed at 11 g / m 2 After the mesh is laid, it is rolled at 0.15 kPa to obtain the skin-friendly layer;

[0118] Dopamine-modified polylactic acid fiber at 20 g / m 2 After the mesh is laid, it is rolled at 0.15 kPa to obtain the reinforcing layer;

[0119] A blended fiber composed of hydroxylated cotton fiber and modified sodium alginate-based fiber prepared in Example 2 at a weight ratio of 1:3.5;

[0120] The blended fiber is 40g / m 2 After the mesh is laid, it is rolled at 0.15 kPa to obtain the liquid-retaining layer;

[0121] After layering the skin-friendly layer, reinforcing layer, and liquid-retaining layer from top to bottom, the fabric is moistened to a moisture content of 80%. Then, it undergoes multiple high-pressure hydroentangling processes on both sides for fixation. Excess moisture is removed by negative pressure suction, and the fiber web is transferred to a drying oven at 75°C and dried to constant weight to obtain the hydroentangled mask base fabric preform. The first pass is front-side hydroentangling at a water pressure of 27 bar; the second pass is back-side hydroentangling at a water pressure of 45 bar; the third pass is front-side hydroentangling at a water pressure of 45 bar; the fourth pass is back-side hydroentangling at a water pressure of 45 bar; the fifth pass is front-side hydroentangling at a water pressure of 70 bar; and the sixth pass is back-side hydroentangling at a water pressure of 60 bar.

[0122] Step 4: Prepare the base fabric for the spunlace mask.

[0123] A spunlace mask base fabric blank with a water content of 25wt% was laid flat between two electrode plates with the skin-friendly layer facing upwards. The electrode plate under the spunlace mask base fabric blank was used as the negative electrode, and the electrode plate on the spunlace mask base fabric blank was used as the positive electrode. The bottom of the spunlace mask base fabric blank was attached to the top of the negative electrode plate, and the distance between the top of the spunlace mask base fabric blank and the positive electrode plate was 10mm. A direct current was applied to the two electrode plates to form a direct current electric field with an electric field strength of 1.5MV / m between the two electrode plates. The treatment was maintained for 25min, and after cooling, it was dried to constant weight to obtain the spunlace mask base fabric.

[0124] Example 6

[0125] This embodiment provides a method for preparing a hydroxyl-modified toughened and moisturizing spunlace mask base fabric, including the following steps:

[0126] Step 1: Preparation of hydroxylated cotton fibers

[0127] Weigh out 100g of cotton fiber and 5000mL of 9mol / L sodium hydroxide solution and add them to a reaction flask for impregnation. Raise the temperature of the reaction flask to 80℃ and keep it at this temperature for 60min. Stir the mixture and add 15g of epichlorohydrin to the reaction flask. Keep the mixture at this temperature for 3h. Add 30g of 1-amino-1-deoxy-D-arabinitol to the reaction flask and keep the mixture at this temperature for 80min. Lower the temperature of the reaction flask to room temperature, filter the mixture, wash the filter cake with purified water until neutral, and then dry it. Transfer the filter cake to a drying oven at 70℃ and dry it to constant weight to obtain hydroxylated cotton fiber.

[0128] Step 2: Preparation of dopamine-modified polylactic acid fibers

[0129] Weigh out 30g of dopamine hydrochloride and 800mL of 0.1mol / L Tirs-HCl solution (pH=8.5) and add them to a reaction flask. Stir until the system is dissolved. Add 70g of polylactic acid fiber to the reaction flask. Raise the temperature of the reaction flask to 50℃ and keep it at that temperature for 6h. Then lower the temperature of the reaction flask to room temperature, filter, wash the filter cake with purified water until neutral, and then dry it. Transfer the filter cake to a drying oven at 80℃ and dry it to constant weight to obtain dopamine-modified polylactic acid fiber.

[0130] Step 3: Prepare the spunlace mask base fabric blank

[0131] Hydroxylated cotton fibers were applied at a concentration of 12 g / m 2 After the mesh is laid, it is rolled at 0.2 kPa to obtain the skin-friendly layer;

[0132] Dopamine-modified polylactic acid fiber was applied at 22 g / m². 2 After the mesh is laid, it is rolled at 0.2 kPa to obtain the reinforcing layer;

[0133] A blended fiber composed of hydroxylated cotton fiber and modified sodium alginate-based fiber prepared in Example 3 at a weight ratio of 1:4;

[0134] The blended fiber was 45g / m 2 After the mesh is laid, it is rolled at 0.2 kPa to obtain the liquid-retaining layer;

[0135] After layering the skin-friendly layer, reinforcing layer, and liquid-retaining layer from top to bottom, the fabric is moistened to a moisture content of 80%. Then, it undergoes multiple high-pressure hydroentangling processes on both sides for fixation. Excess moisture is removed by negative pressure suction, and the fiber web is transferred to a drying oven at 80°C and dried to constant weight to obtain the hydroentangled mask base fabric preform. The first hydroentangling process is on the front side at a water pressure of 30 bar; the second is on the back side at a water pressure of 60 bar; the third is on the front side at a water pressure of 60 bar; the fourth is on the back side at a water pressure of 50 bar; the fifth is on the front side at a water pressure of 80 bar; and the sixth is on the back side at a water pressure of 65 bar.

[0136] Step 4: Prepare the base fabric for the spunlace mask.

[0137] A spunlace mask base fabric blank with a water content of 30wt% was laid flat between two electrode plates with the skin-friendly layer facing upwards. The electrode plate under the spunlace mask base fabric blank was used as the negative electrode, and the electrode plate on the spunlace mask base fabric blank was used as the positive electrode. The bottom of the spunlace mask base fabric blank was attached to the top of the negative electrode plate, and the distance between the top of the spunlace mask base fabric blank and the positive electrode plate was 12mm. A direct current was applied to the two electrode plates to form a direct current electric field with an electric field strength of 1.3MV / m between the two electrode plates. The treatment was maintained for 30min, and after cooling, it was dried to constant weight to obtain the spunlace mask base fabric.

[0138] Comparative Example 1

[0139] The difference between this comparative example and Example 6 is that step four is omitted, and the spunlace mask base fabric blank prepared in step three is used as the spunlace mask base fabric.

[0140] Comparative Example 2

[0141] The difference between this comparative example and Example 6 is that step one is omitted, and the cotton fiber in step one is used instead of the hydroxylated cotton fiber in step three.

[0142] Comparative Example 3

[0143] The difference between this comparative example and Example 6 is that step two is omitted, and the polylactic acid fiber in step two is used instead of the dopamine-modified polylactic acid fiber in step three.

[0144] Comparative Example 4

[0145] The difference between this comparative example and Example 6 is that, in the preparation of the modified sodium alginate-based fiber, step 2 is omitted, and the core-shell modified sodium alginate in step 1 is used instead of the modified sodium alginate in step 3.

[0146] Performance testing:

[0147] The spunlace mask base fabrics prepared in Examples 4-6 and Comparative Examples 1-4 were completely immersed in the aqueous solution for 10 minutes to prepare test samples. The breaking strength and elongation at break of the test samples before and after wetting were determined in accordance with the standard GB / T 24218.18-2014 "Textiles - Nonwovens - Test Methods - Part 18: Determination of breaking strength and elongation at break (grab method)".

[0148] The mass of the spunlace mask base fabrics prepared in Examples 4-6 and Comparative Examples 1-4 before and after liquid absorption was determined according to standard GB / T 24218.6-2010 "Textiles - Nonwovens - Test Methods - Part 6: Determination of Absorbency". The results were obtained using the formula... Calculate the moisture absorption of the sample, where m1 is the weight of the sample after moisture absorption and m0 is the weight of the sample before moisture absorption. After moisture absorption, suspend the sample for another 20 minutes according to the standard and measure the weight m2 of the sample, using the formula... Calculate the liquid retention rate of the sample, where m2 is the weight of the sample after 20 minutes of suspension following liquid absorption.

[0149] The mask substrates prepared in Examples 4-6 and Comparative Examples 1-4 were placed in purified water at a temperature of 60°C and kept completely submerged for 30 minutes. The dimensions of the mask substrates before and after submersion were measured, and the results were calculated according to the formula. Calculate the dimensional change rate of the sample, where S1 is the surface area of ​​the film substrate after immersion and S0 is the surface area of ​​the film substrate after immersion.

[0150] Referring to standard GB / T 12704.1-2009 "Textiles - Test Methods for Moisture Permeability of Fabrics - Part 1: Moisture Absorption Method", the forward and reverse moisture permeability of the mask substrate samples prepared in Examples 4-6 and Comparative Examples 1-4 were determined. Forward moisture permeability is the rate of moisture permeability measured from the skin-friendly layer to the liquid-retaining layer, and reverse moisture permeability is the rate of moisture permeability measured from the liquid-retaining layer to the skin-friendly layer. The results were then calculated according to the formula... Calculate the difference in moisture permeability between forward and reverse directions, where... Positive moisture permeability This refers to reverse moisture permeability;

[0151] The specific test data is shown in Table 1-2 below.

[0152] Table 1 - Test data of toughness properties of the specimens

[0153]

[0154] Table 2 - Test data on the moisturizing performance of the samples

[0155]

[0156] Data Analysis:

[0157] Comparative analysis of the data in Tables 1-2 shows that the spunlace mask base fabric prepared by this invention has a tensile strength of 137 N and an elongation at break of 38% before wetting, and a tensile strength of 105 N and an elongation at break of 44% after wetting. The moisture absorption of the spunlace mask base fabric reaches 15.3 g / g, the liquid retention rate reaches 86.7%, the dimensional change rate is reduced to 2.11%, and the forward and reverse moisture permeability difference reaches 1350 g / (m²). 2 •24h) All performance test data were better than the comparative example, indicating that the present invention, through the layered composite of modified sodium alginate fiber, hydroxylated cotton fiber, and dopamine-modified polylactic acid fiber, combined with the technical solution of high-pressure hydroentangling and electric field orientation treatment, not only effectively improves the toughness and moisture absorption and liquid retention performance of the mask base fabric, but also improves the dimensional stability and moisture permeability and shrinkage performance of the mask base fabric after moisture absorption, avoiding excessive moisture on the skin or loss of nutrient solution through evaporation, thereby improving the skin care effect.

[0158] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0159] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0160] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A hydroxyl-modified, toughened, and moisturizing spunlace mask base fabric, comprising a skin-friendly layer, a reinforcing layer, and a liquid-retaining layer, characterized in that, The mask base fabric is obtained by layering a skin-friendly layer, a reinforcing layer and a liquid-retaining layer from top to bottom, fixing them by hydroentangling, and then undergoing ion beam orientation treatment; The skin-friendly layer is composed of hydroxylated cotton fibers at a concentration of 10-12 g / m². 2 After being laid out, the mesh is rolled into shape under a pressure of 0.1-0.2 kPa. The reinforcing layer is made of dopamine-modified polylactic acid fiber at a concentration of 18-22 g / m². 2 After being laid out, the mesh is rolled into shape under a pressure of 0.1-0.2 kPa. The liquid-retaining layer is formed by rolling a blend of hydroxylated cotton fiber and modified sodium alginate-based fiber in a weight ratio of 1:(3-4) at a density of 35-45 g / m². The rolling pressure is 0.1-0.2 kPa. The modified sodium alginate-based fiber is prepared by wet spinning of a spinning solution, which includes modified sodium alginate, silk fibroin, and collagen peptides. Modified sodium alginate is obtained through the following steps: Sodium alginate, an accelerator, and deionized water are mixed, the reaction system temperature is raised to 60-70℃, and the mixture is stirred for 80-100 minutes. An emulsion is added to the reaction system, and the mixture is stirred and emulsified for 20-30 minutes. Then, a shell solution is added to the reaction system, and the mixture is kept at this temperature for 90-120 minutes. After post-treatment, core-shell modified sodium alginate is obtained. Alternatively, core-shell modified sodium alginate, 80 vol% ethanol aqueous solution, and triethoxysilylbutyraldehyde are mixed and stirred, the reaction system temperature is raised to 45-55℃, and the mixture is kept at this temperature for 140-160 minutes. After post-treatment, modified sodium alginate is obtained. The use of sodium alginate, accelerator, deionized water, emulsion, and shell solution is... The mass ratio is 5g:(0.1-0.2g):500mL:500mL:(2.5-3g). The accelerator is composed of nano-calcium carbonate and glycerol in a weight ratio of 1:

3. The emulsion is composed of isopropanol, Span-80, sodium dodecylbenzenesulfonate, and gluconolactone in a weight ratio of 100mL:(2-3g):(1-2g):0.12g. The shell solution is composed of tetraethyl orthosilicate and glycidyltrimethoxysilane in a weight ratio of 3:

1. The emulsification stirring speed is 8000-10000r / min. The mass ratio of core-shell modified sodium alginate, 80vol% ethanol aqueous solution, and triethoxysilylbutyraldehyde is 10g:500mL:(1.5-1.7g). The preparation method of hydroxylated cotton fiber is as follows: cotton fiber and sodium hydroxide solution are mixed, the temperature of the reaction system is raised to 70-80℃, and the mixture is kept at this temperature for 40-60 min. Epichlorohydrin is added to the reaction system, and the reaction is kept at this temperature for 2-3 h. 1-Amino-1-deoxy-D-arabinitol is added to the reaction system, and the reaction is kept at this temperature for 60-80 min. After treatment, hydroxylated cotton fiber is obtained. The ratio of the amount of cotton fiber, sodium hydroxide solution, epichlorohydrin and 1-amino-1-deoxy-D-arabinitol is 10g:500mL:(1.2-1.5g):3g, and the concentration of the sodium hydroxide solution is 8-9mol / L.

2. The hydroxyl-modified toughened and moisturizing spunlace mask base fabric according to claim 1, characterized in that, The preparation method of dopamine-modified polylactic acid fiber is as follows: Dopamine hydrochloride and buffer solution are mixed and stirred until the system is dissolved. Polylactic acid fiber is added to the reaction system. The temperature of the reaction system is raised to 40-50℃ and kept at the temperature for 4-6 hours. After post-treatment, dopamine-modified polylactic acid fiber is obtained.

3. The hydroxyl-modified toughened and moisturizing spunlace mask base fabric according to claim 2, characterized in that, The ratio of dopamine hydrochloride, buffer solution, and polylactic acid cellulose is (2-3g):80mL:7g, and the buffer solution is a 0.1mol / L Tirs-HCl solution with pH=8.

5.

4. The hydroxyl-modified toughened and moisturizing spunlace mask base fabric according to claim 1, characterized in that, Modified sodium alginate-based fibers are obtained through the following steps: A1. Mix modified sodium alginate, silk fibroin, collagen peptides and sodium hydroxide solution, raise the temperature of the reaction system to 50-60℃, keep the reaction at this temperature for 2-3 hours, and then perform post-treatment to obtain the spinning solution. A2. Add the spinning solution to the spinning needle tube, set the gap between the spinning needle tube and the surface of the coagulation bath to be 15-25 mm, and extrude the spinning solution into the coagulation bath at 0.2-0.3 mL / min to solidify. After post-treatment, the modified sodium alginate-based fiber is obtained.

5. The hydroxyl-modified toughened and moisturizing spunlace mask base fabric according to claim 4, characterized in that, In step A1, the ratio of modified sodium alginate, silk fibroin, collagen peptide, and sodium hydroxide solution is (10-12g):(7-8g):(4-5g):90mL, and the concentration of the sodium hydroxide solution is 1.2-1.5mol / L. In step A2, the inner diameter of the spinning needle is 80-100μm, the coagulation bath is composed of calcium chloride, anhydrous ethanol, and deionized water in the ratio of (3-5g):(25-28mL):(80-90mL), the temperature of the coagulation bath is 25-30℃, and the solidification time of the coagulation bath is 60-80s.

Images