A double-layer mask base cloth with high absorption, high permeability and high moisturizing capacity

Abstract

The application discloses a double-layer mask base cloth with high absorption, high permeability and high moisturizing capacity, and relates to the technical field of mask base cloth.The preparation process of the double-layer mask base cloth comprises the following operation steps: step A: mixing modified cuprammonium fibers, lyocell fibers and PLA fibers, opening and carding into a web to obtain a unidirectional flow fiber web; step B: modifying hollow nanoparticles by means of an imidazole-based silane coupling agent, ultrasonic dispersion in an ethanol aqueous solution to obtain a modified hollow nanoparticle solution; mixing the modified cuprammonium fibers, fine denier lyocell fibers and viscose fibers, opening and carding into a web, immersing the web in the modified hollow nanoparticle solution, taking out and drying to obtain a hydrophilic liquid storage fiber web; laminating the unidirectional flow fiber web and the hydrophilic liquid storage fiber web, and then performing water jet reinforcement to obtain a composite base cloth; and performing pressure impregnation of the composite base cloth in a metal salt solution, washing and drying to obtain the double-layer mask base cloth; and the double-layer mask base cloth has good air permeability and moisturizing property.

Description

Technical Field

[0001] This invention relates to the field of mask base fabric technology, specifically a double-layer mask base fabric with high absorption, high penetration and moisturizing capabilities. Background Technology

[0002] As consumers' demands for the efficacy and skin feel of face masks continue to rise, traditional single-layer non-woven fabrics and modified silk mask bases are no longer adequate to meet current market needs. The mainstream mask bases on the market generally suffer from two technical shortcomings: First, the single-layer structure has insufficient liquid retention capacity, making it prone to essence dripping and loss during application. Many skincare active ingredients evaporate and are lost before even reaching the skin, resulting in low raw material utilization. Second, the fiber pore structure is difficult to precisely control. If the fibers are too dense, they will block airflow, hindering the expulsion of moisture from the skin and causing a stuffy feeling. If the fibers are loose and the pores are too large, airflow is too fast, causing the essence inside the mask to evaporate quickly and dry prematurely.

[0003] In summary, it is of great significance to prepare a double-layer membrane base fabric with high absorption, high permeability and moisturizing ability. Summary of the Invention

[0004] The purpose of this invention is to provide a solution to the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A double-layer membrane base fabric with high absorption, high permeability, and moisturizing capabilities, the preparation process of which includes the following steps: Step A: A1: Butanetetracarboxylic acid undergoes an amide condensation reaction with 1-(3-aminopropyl)imidazolium to obtain a modified butanetetracarboxylic acid crosslinking agent; this agent is then used to modify cuprammonium fiber to obtain modified cuprammonium fiber. A2: Mix modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber, open and card them into a web to obtain a unidirectional flow fiber web; Step B: B1: Hollow nanoparticles are modified with imidazole silane coupling agent and ultrasonically dispersed in an ethanol aqueous solution to obtain a modified hollow nanoparticle solution; modified cuprammonium fiber, fine denier lyocell fiber and viscose fiber are mixed, opened and combed into a web, immersed in the modified hollow nanoparticle solution, taken out and dried to obtain a hydrophilic liquid storage fiber web; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is impregnated in a metal salt solution under pressure, washed and dried to obtain the double-layer membrane base fabric.

[0006] A more optimized method for preparing the modified cuprammonium fiber is as follows: butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to N,N-dimethylformamide and mixed evenly. 1-(3-aminopropyl)imidazolium is added and stirred overnight. The mixture is then washed and dried to obtain the modified butanetetracarboxylic acid crosslinking agent. Cuprammonium fiber is then added to N,N-dimethylformamide and mixed. Modified butanetetracarboxylic acid and sodium hypophosphite are added, and the mixture is heated and stirred. The mixture is then washed and dried to obtain the modified cuprammonium fiber.

[0007] In a more optimized manner, the molar ratio of butanetetracarboxylic acid to 1-(3-aminopropyl)imidazole is 1:1.1; the modified cuprammonium fiber and the raw materials for the modified cuprammonium fiber include the following components: by mass parts, 60-90 parts cuprammonium fiber, 10-15 parts modified butanetetracarboxylic acid crosslinking agent, and 0.8-2.5 parts sodium hypophosphite.

[0008] In a more optimized configuration, the modified cuprammonium fiber has a fineness of 1.0~1.3 dtex; the coarse denier lyocell fiber has a fineness of 1.2~1.7 dtex; the PLA fiber has a fineness of 1.5~2.0 dtex; the fine denier lyocell fiber has a fineness of 0.3~0.9 dtex; and the viscose fiber has a fineness of 1.3~1.7 dtex.

[0009] In a more optimized configuration, the mass ratio of the hollow nanoparticles to the imidazolium silane coupling agent is 10:(1~3); the concentration of the modified hollow nanoparticle solution is 3~7wt%; the concentration of the metal salt solution is 0.5~3wt%; and the metal salt solution includes one of zinc chloride, zinc acetate, and copper chloride.

[0010] In a more optimized manner, in step A, the mass ratio of the modified cupro fiber, coarse denier lyocell fiber, and PLA fiber is (30~35):(30~35):(22~32); in step B, the mass ratio of the modified cupro fiber, fine denier lyocell fiber, and viscose fiber is (35~45):(20~30):(30~35).

[0011] Ideally, the areal density of the unidirectional flow-guiding fiber web is 10~25 g / m². 2 The areal density of the hydrophilic liquid storage fiber web is 15~30 g / m². 2 .

[0012] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a gradient structure design of coarse and fine fibers. A unidirectional flow-guiding fiber web is prepared by compounding coarser modified cuprammonium fiber, lyocell fiber, and PLA fiber, while finer modified cuprammonium fiber and fine denier lyocell fiber are used as a hydrophilic liquid storage fiber web. The unidirectional flow-guiding fiber web and the hydrophilic liquid storage fiber web are stacked and reinforced with hydroentangling to form a gradient pore structure, effectively balancing the liquid conduction, liquid storage, and structural stability of the fabric.

[0013] Among them, cupro fiber has excellent hydrophilicity and liquid retention. When it comes into contact with water, it can swell appropriately to increase the liquid storage capacity. Lyocell fiber effectively improves the strength of the fabric surface, while PLA fiber plays an elastic support role. This solves the defects of pure cupro fiber, such as easy relaxation, collapse, and fabric sag when wet, and significantly improves the overall mechanical properties and wet-application stability of the mask base fabric.

[0014] This invention modifies hollow nanoparticles with imidazole-based silanes and covalently grafts imidazole functional groups onto the surface of cuprammonium fibers using modified butanetetracarboxylic acid. This uniformly introduces imidazole coordination active sites into both the fibers and hollow nanoparticles. Subsequent in-situ coordination crosslinking with a metal salt solution results in a stable metal-coordinated crosslinking network between the two layers. This effectively solves the problem of easy detachment and powder shedding of nanofillers, thereby improving the load stability of hollow nanoparticles within the base fabric, preventing powder detachment and clogging of pores, and enhancing safety during use.

[0015] The hollow structure of the hollow nanoparticles can physically seal the essence and achieve slow release. Together with the water-swelling liquid storage of the fiber itself, it forms a synergistic moisturizing system that can quickly absorb and lock in water, effectively improving the water absorption rate, liquid retention rate and penetration performance of the mask base fabric, so as to achieve the effect of high penetration and high moisturizing of the essence.

[0016] Meanwhile, the coordination crosslinking network further strengthens the interfacial bonding force of the two layers, effectively improving the shortcomings of traditional two-layer spunlace base fabrics, such as easy delamination and low peel strength after wet immersion, and significantly enhancing the interlayer bonding stability and wet dimensional stability of the base fabric. This invention, through the synergistic effect of differentiated fiber fineness ratio, two-layer gradient structure design, and coordination modification, enables the base fabric to possess excellent unidirectional liquid guiding and water-locking and moisturizing properties. Detailed Implementation

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0018] Example 1; A double-layered film base fabric with high absorption, high penetration, and moisturizing capabilities includes the following steps: Step A: A1: The preparation method of modified cuprammonium fiber is as follows: Butanetetracarboxylic acid and 1-(3-aminopropyl)imidazolium are weighed at a molar ratio of 1:1.1; butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to 50 parts of N,N-dimethylformamide and mixed evenly; 1-(3-aminopropyl)imidazolium is added and stirred overnight; the mixture is washed and dried to obtain modified butanetetracarboxylic acid; the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to butanetetracarboxylic acid is 1.15:1; the molar ratio of N-hydroxysuccinimide to butanetetracarboxylic acid is 1.08:1; 80 parts of cuprammonium fiber with a fineness of 1.0 were added to 200 parts of N,N-dimethylformamide, along with 12 parts of modified butanetetracarboxylic acid and 2.1 parts of sodium hypophosphite. The mixture was heated to 70°C and stirred for 12 hours. After washing and drying, the modified cuprammonium fiber was obtained. A2: Modified cuprammonium fiber, lyocell fiber with a fineness of 1.7 dtex, and PLA fiber with a fineness of 1.7 are mixed, opened, and carded into a web to obtain a surface density of 10 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, and N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added. The mixture was heated under reflux for 5 hours in a nitrogen atmosphere, centrifuged, washed, and ultrasonically dispersed again in an 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. The mass ratio of hollow nano-silica to N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was 10:1.5. Modified cuprammonium fiber, fine denier lyocell fiber (0.6 dtex), and viscose fiber (1.5 dtex) were mixed, opened, and carded into a web. This web was then immersed in a modified hollow nanoparticle solution, removed, and dried at 80°C to obtain a surface density of 15 g / m². 2 A hydrophilic liquid storage fiber mesh; wherein the mass ratio of modified cuprammonium fiber, fine denier lyocell fiber, and viscose fiber is 45:30:35; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is placed in a 0.8wt% zinc acetate aqueous solution, pressure impregnated at 0.3MPa for 10 minutes, washed, and dried at 80℃ to obtain the double-layer film base fabric.

[0019] Example 2; A double-layered film base fabric with high absorption, high penetration, and moisturizing capabilities includes the following steps: Step A: A1: The preparation method of modified cuprammonium fiber is as follows: Butanetetracarboxylic acid and 1-(3-aminopropyl)imidazolium are weighed at a molar ratio of 1:1.1; butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to 50 parts of N,N-dimethylformamide and mixed evenly; 1-(3-aminopropyl)imidazolium is added and stirred overnight; the mixture is washed and dried to obtain modified butanetetracarboxylic acid; the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to butanetetracarboxylic acid is 1.15:1; the molar ratio of N-hydroxysuccinimide to butanetetracarboxylic acid is 1.08:1; 80 parts of cuprammonium fiber with a fineness of 1.0 were added to 200 parts of N,N-dimethylformamide, along with 12 parts of modified butanetetracarboxylic acid and 2.1 parts of sodium hypophosphite. The mixture was heated to 70°C and stirred for 12 hours. After washing and drying, the modified cuprammonium fiber was obtained. A2: Modified cuprammonium fiber, 1.7 dtex lyocell fiber, and 1.7 dtex PLA fiber are mixed, opened, and carded into a web to obtain a surface density of 20 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, and N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added. The mixture was heated under reflux for 5 hours in a nitrogen atmosphere, centrifuged, washed, and ultrasonically dispersed again in an 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. The mass ratio of hollow nano-silica to N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was 10:1.5. Modified cuprammonium fiber, fine denier lyocell fiber (0.6 dtex), and viscose fiber (1.5 dtex) were mixed, opened, and carded into a web. This web was then immersed in a modified hollow nanoparticle solution, removed, and dried at 80°C to obtain a surface density of 25 g / m². 2 A hydrophilic liquid storage fiber mesh; wherein the mass ratio of modified cuprammonium fiber, fine denier lyocell fiber, and viscose fiber is 45:30:35; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is placed in a 0.8wt% zinc acetate aqueous solution, pressure impregnated at 0.3MPa for 10 minutes, washed, and dried at 80℃ to obtain the double-layer film base fabric.

[0020] Example 3; A double-layered film base fabric with high absorption, high penetration, and moisturizing capabilities includes the following steps: Step A: A1: The preparation method of modified cuprammonium fiber is as follows: Butanetetracarboxylic acid and 1-(3-aminopropyl)imidazolium are weighed at a molar ratio of 1:1.1; butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to 50 parts of N,N-dimethylformamide and mixed evenly; 1-(3-aminopropyl)imidazolium is added and stirred overnight; the mixture is washed and dried to obtain modified butanetetracarboxylic acid; the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to butanetetracarboxylic acid is 1.15:1; the molar ratio of N-hydroxysuccinimide to butanetetracarboxylic acid is 1.08:1; 80 parts of cuprammonium fiber with a fineness of 1.0 were added to 200 parts of N,N-dimethylformamide, along with 12 parts of modified butanetetracarboxylic acid and 2.1 parts of sodium hypophosphite. The mixture was heated to 70°C and stirred for 12 hours. After washing and drying, the modified cuprammonium fiber was obtained. A2: Modified cuprammonium fiber, 1.7 dtex lyocell fiber, and 1.7 dtex PLA fiber are mixed, opened, and carded into a web to obtain a surface density of 20 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, and N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added. The mixture was heated under reflux for 5 hours in a nitrogen atmosphere, centrifuged, washed, and ultrasonically dispersed again in an 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. The mass ratio of hollow nano-silica to N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was 10:1.5. Modified cuprammonium fiber, fine denier lyocell fiber (0.6 dtex), and viscose fiber (1.5 dtex) were mixed, opened, and carded into a web. This web was then immersed in a modified hollow nanoparticle solution, removed, and dried at 80°C to obtain a surface density of 30 g / m². 2 A hydrophilic liquid storage fiber mesh; wherein the mass ratio of modified cuprammonium fiber, fine denier lyocell fiber, and viscose fiber is 45:30:35; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is placed in a 0.8wt% zinc acetate aqueous solution, pressure impregnated at 0.3MPa for 10 minutes, washed, and dried at 80℃ to obtain the double-layer film base fabric.

[0021] Comparative Example 1 is based on Example 2; the fineness of the lyocell fiber is the same as that of the flow guide layer; the remaining operating steps are the same; Step A: A1: The preparation method of modified cuprammonium fiber is as follows: Butanetetracarboxylic acid and 1-(3-aminopropyl)imidazolium are weighed at a molar ratio of 1:1.1; butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to 50 parts of N,N-dimethylformamide and mixed evenly; 1-(3-aminopropyl)imidazolium is added and stirred overnight; the mixture is washed and dried to obtain modified butanetetracarboxylic acid; the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to butanetetracarboxylic acid is 1.15:1; the molar ratio of N-hydroxysuccinimide to butanetetracarboxylic acid is 1.08:1; 80 parts of cuprammonium fiber with a fineness of 1.0 were added to 200 parts of N,N-dimethylformamide, along with 12 parts of modified butanetetracarboxylic acid and 2.1 parts of sodium hypophosphite. The mixture was heated to 70°C and stirred for 12 hours. After washing and drying, the modified cuprammonium fiber was obtained. A2: Modified cuprammonium fiber, lyocell fiber with a fineness of 1.7 dtex, and PLA fiber with a fineness of 1.7 dtex are mixed, opened, and carded into a web to obtain a surface density of 20 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added, and the mixture was heated under nitrogen atmosphere and refluxed for 5 hours. After centrifugation and washing, the mixture was ultrasonically dispersed again in 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. Modified cuprammonium fiber, 1.7 dtex lyocell fiber, and 1.5 dtex viscose fiber were mixed, opened, and carded into a web. This web was then immersed in a modified hollow nanoparticle solution, removed, and dried at 80°C to obtain a surface density of 25 g / m³. 2 A hydrophilic liquid storage fiber mesh; wherein the mass ratio of modified cuprammonium fiber, lyocell fiber and viscose fiber is 45:30:35; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is placed in a 0.8wt% zinc acetate aqueous solution, pressure impregnated at 0.3MPa for 10 minutes, washed, and dried at 80℃ to obtain the double-layer film base fabric.

[0022] Comparative Example 2 is based on Example 2; the composite base fabric was impregnated in a modified hollow nanoparticle solution; the remaining operation steps were the same; Step A: A1: The preparation method of modified cuprammonium fiber is as follows: Butanetetracarboxylic acid and 1-(3-aminopropyl)imidazolium are weighed at a molar ratio of 1:1.1; butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to 50 parts of N,N-dimethylformamide and mixed evenly; 1-(3-aminopropyl)imidazolium is added and stirred overnight; the mixture is washed and dried to obtain modified butanetetracarboxylic acid; the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to butanetetracarboxylic acid is 1.15:1; the molar ratio of N-hydroxysuccinimide to butanetetracarboxylic acid is 1.08:1; 80 parts of cuprammonium fiber with a fineness of 1.0 were added to 200 parts of N,N-dimethylformamide, along with 12 parts of modified butanetetracarboxylic acid and 2.1 parts of sodium hypophosphite. The mixture was heated to 70°C and stirred for 12 hours. After washing and drying, the modified cuprammonium fiber was obtained. A2: Modified cuprammonium fiber, 1.7 dtex lyocell fiber, and 1.7 dtex PLA fiber are mixed, opened, and carded into a web to obtain a surface density of 20 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added, and the mixture was heated under nitrogen atmosphere and refluxed for 5 hours. After centrifugation and washing, the mixture was ultrasonically dispersed again in 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. Modified cuprammonium fiber, fine denier lyocell fiber with a fineness of 0.6 dtex, and viscose fiber with a fineness of 1.5 dtex were mixed, opened, and carded into a web to obtain a web with an areal density of 25 g / m². 2 A hydrophilic liquid storage fiber mesh; wherein the mass ratio of modified cuprammonium fiber, fine denier lyocell fiber, and viscose fiber is 45:30:35; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is immersed in the modified hollow nanoparticle solution, taken out, dried at 80°C, and then placed in a 0.8wt% zinc acetate aqueous solution, pressure-impregnated at 0.3MPa for 10 minutes, washed, and dried at 80°C to obtain the double-layer film base fabric.

[0023] Comparative Example 3 is based on Example 2; no metal salt solution was introduced; the remaining operating steps were the same; Step A: A1: The preparation method of modified cuprammonium fiber is as follows: Butanetetracarboxylic acid and 1-(3-aminopropyl)imidazolium are weighed at a molar ratio of 1:1.1; butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to 50 parts of N,N-dimethylformamide and mixed evenly; 1-(3-aminopropyl)imidazolium is added and stirred overnight; the mixture is washed and dried to obtain modified butanetetracarboxylic acid; the molar ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to butanetetracarboxylic acid is 1.15:1; the molar ratio of N-hydroxysuccinimide to butanetetracarboxylic acid is 1.08:1; 80 parts of cuprammonium fiber with a fineness of 1.0 were added to 200 parts of N,N-dimethylformamide, along with 12 parts of modified butanetetracarboxylic acid and 2.1 parts of sodium hypophosphite. The mixture was heated to 70°C and stirred for 12 hours. After washing and drying, the modified cuprammonium fiber was obtained. A2: Modified cuprammonium fiber, 1.7 dtex lyocell fiber, and 1.7 dtex PLA fiber are mixed, opened, and carded into a web to obtain a surface density of 20 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added, and the mixture was heated under nitrogen atmosphere and refluxed for 5 hours. After centrifugation and washing, the mixture was ultrasonically dispersed again in 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. Modified cuprammonium fiber, fine denier lyocell fiber (0.6 dtex), and viscose fiber (1.5 dtex) were mixed, opened, and carded into a web. This web was then immersed in a modified hollow nanoparticle solution, removed, and dried at 80°C to obtain a surface density of 25 g / m². 2 A hydrophilic liquid storage fiber mesh; wherein the mass ratio of modified cuprammonium fiber, fine denier lyocell fiber, and viscose fiber is 45:30:35; B2: After layering a unidirectional flow-guiding fiber mesh with a hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain a composite base fabric; that is, a double-layer membrane base fabric.

[0024] Comparative Example 4 is based on Example 2; the cupro fiber was not modified; the remaining operating steps were the same; Step A: A2: Mix cupro fiber, lyocell fiber with a fineness of 1.7 dtex, and PLA fiber with a fineness of 1.7, open and card them into a web to obtain a surface density of 20 g / m². 2 A unidirectional flow-guiding fiber web; wherein the mass ratio of cupro fiber, coarse denier lyocell fiber, and PLA fiber is 35:30:22; Step B: B1: Hollow nano-silica was ultrasonically dispersed in anhydrous toluene, N-[3-(triethoxysilyl)propyl]-4,5-dihydroimidazole was added, and the mixture was heated under nitrogen atmosphere and refluxed for 5 hours. After centrifugation and washing, the mixture was ultrasonically dispersed again in 80wt% ethanol aqueous solution to obtain a modified hollow nanoparticle solution with a concentration of 7wt%. Cuprammonium fiber, fine denier lyocell fiber (0.6 dtex), and viscose fiber (1.5 dtex) were mixed, opened, and carded into a web. This web was then impregnated with a modified hollow nanoparticle solution, removed, and dried at 80°C to obtain a surface density of 25 g / m². 2 A hydrophilic liquid storage fiber web; wherein the mass ratio of cupro fiber, fine denier lyocell fiber, and viscose fiber is 45:30:35; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is placed in a 0.8wt% zinc acetate aqueous solution, pressure impregnated at 0.3MPa for 10 minutes, washed, and dried at 80℃ to obtain the double-layer film base fabric.

[0025] Testing and experimentation: 1. Water absorption: The double-layer membrane base fabrics prepared in Examples 1-3 and Comparative Examples 1-4 were cut into 10cm×10cm samples; the water absorption was tested according to GB / T24218.6-2010. 2. Take five samples of the double-layer membrane base fabrics prepared in Examples 1-3 and Comparative Examples 1-4 respectively, weigh them, and record the weight as m0. Then, immerse each sample in deionized water until saturated, and record the weight as m1. Place them in an environment with a temperature of 50℃ and a wind speed of 0.5m / s for 6 hours, weigh them, and record the weight as m2. Calculate the water retention rate and take the average value. The formula for calculating the water retention rate is: Water retention rate = (m2m0) / (m1m0)×100%; 3. Moisture permeability: The water vapor permeability of the double-layer membrane base fabrics prepared in Examples 1-3 and Comparative Examples 1-4 was tested according to YY / T0471.2 at a temperature of 36℃ and a relative humidity of 90% RH. Table 1

[0026] Conclusions: Comparative Example 1 is based on Example 2; the fineness of the lyocell fiber is the same as that of the flow-guiding layer; this results in a poor effect in forming the gradient network structure, thus leading to a decrease in performance. Comparative Example 2 is based on Example 2; the composite base fabric is impregnated in a modified hollow nanoparticle solution; the nanoparticles not only adhere to the lower liquid storage layer that requires filler, but also penetrate a large amount into the large-diameter pores of the upper flow-guiding layer. The pores of the flow-guiding layer are blocked by the filler, and the conduction channels of water vapor and liquid are obstructed, thus leading to a decrease in performance. Comparative Example 3 is based on Example 2; no metal salt solution was introduced; no metal coordination crosslinking was formed, thus causing the hollow nanoparticles to fall off, resulting in a decrease in performance. Comparative Example 4 is based on Example 2; the cuprammonium fiber was not modified; the interlayer structure is loose, thus leading to a decrease in performance.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A double-layered film base fabric with high absorption, high penetration, and moisturizing capabilities, characterized in that: The preparation process of the double-sided membrane base fabric includes the following steps: Step A: A1: Butanetetracarboxylic acid undergoes an amide condensation reaction with 1-(3-aminopropyl)imidazolium to obtain a modified butanetetracarboxylic acid crosslinking agent; this agent is then used to modify cuprammonium fiber to obtain modified cuprammonium fiber. A2: Mix modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber, open and card them into a web to obtain a unidirectional flow fiber web; Step B: B1: Hollow nanoparticles are modified with imidazole silane coupling agent and ultrasonically dispersed in an ethanol aqueous solution to obtain a modified hollow nanoparticle solution; modified cuprammonium fiber, fine denier lyocell fiber and viscose fiber are mixed, opened and combed into a web, immersed in the modified hollow nanoparticle solution, taken out and dried to obtain a hydrophilic liquid storage fiber web; B2: After stacking the unidirectional flow-guiding fiber mesh and the hydrophilic liquid storage fiber mesh, hydroentanglement reinforcement is carried out to obtain the composite base fabric; the composite base fabric is impregnated in a metal salt solution under pressure, washed and dried to obtain the double-layer membrane base fabric.

2. The double-layer film base fabric with high absorption, high penetration, and moisturizing capabilities according to claim 1, characterized in that: The modified cuprammonium fiber is prepared as follows: butanetetracarboxylic acid, N-hydroxysuccinimide, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride are added to N,N-dimethylformamide and mixed evenly. 1-(3-aminopropyl)imidazolium is added and stirred overnight. The mixture is then washed and dried to obtain a modified butanetetracarboxylic acid crosslinking agent. Cuprammonium fiber is then added to N,N-dimethylformamide and mixed. Modified butanetetracarboxylic acid and sodium hypophosphite are added, and the mixture is heated and stirred. The mixture is then washed and dried to obtain the modified cuprammonium fiber.

3. The double-layer film base fabric with high absorption, high penetration, and moisturizing capabilities according to claim 2, characterized in that: The molar ratio of butanetetracarboxylic acid to 1-(3-aminopropyl)imidazole is 1:1.1; the modified cuprammonium fiber and the raw materials of the modified cuprammonium fiber include the following components: by mass parts, 60-90 parts cuprammonium fiber, 10-15 parts modified butanetetracarboxylic acid crosslinking agent, and 0.8-2.5 parts sodium hypophosphite.

4. The double-layer film base fabric with high absorption, high penetration, and moisturizing capabilities according to claim 1, characterized in that: The modified cuprammonium fiber has a fineness of 1.0~1.3 dtex; the coarse denier lyocell fiber has a fineness of 1.2~1.7 dtex; the PLA fiber has a fineness of 1.5~2.0 dtex; the fine denier lyocell fiber has a fineness of 0.3~0.9 dtex; and the viscose fiber has a fineness of 1.3~1.7 dtex.

5. The double-layer film base fabric with high absorption, high penetration, and moisturizing capabilities according to claim 1, characterized in that: The mass ratio of the hollow nanoparticles to the imidazolyl silane coupling agent is 10:(1~3); the concentration of the modified hollow nanoparticle solution is 3~7wt%; the concentration of the metal salt solution is 0.5~3wt%; the metal salt solution includes one of zinc chloride, zinc acetate, and copper chloride.

6. The double-layer film base fabric with high absorption, high penetration, and moisturizing capabilities according to claim 1, characterized in that: In step A, the mass ratio of the modified cuprammonium fiber, coarse denier lyocell fiber, and PLA fiber is (30~35):(30~35):(22~32); in step B, the mass ratio of the modified cuprammonium fiber, fine denier lyocell fiber, and viscose fiber is (35~45):(20~30):(30~35).

7. The double-layer film base fabric with high absorption, high penetration, and moisturizing capabilities according to claim 1, characterized in that: The areal density of the unidirectional flow-guiding fiber web is 10~25 g / m². 2 The areal density of the hydrophilic liquid storage fiber web is 15~30 g / m². 2 .

8. A double-layer membrane base fabric prepared according to any one of claims 1 to 7, which has high absorption, high penetration and moisturizing capabilities.

Images