High-breathability flame-retardant moisture-conducting fiber membrane material and preparation method thereof

Abstract

The embodiment of the invention discloses a high-breathability flame-retardant moisture-conducting fiber membrane material and a preparation method thereof. The method comprises the following steps: uniformly mixing polyacrylonitrile and N, N-dimethylformamide, carrying out electrostatic spinning on an obtained spinning solution, and soaking in a dopamine solution to obtain a polyacrylonitrile / dopamine nanofiber membrane; carrying out foam coating finishing and baking on the polyacrylonitrile / dopamine nanofiber membrane to obtain a fiber layer body; a hydrophobic solution is spun on the surface of the fiber layer body through electrostatic spinning, and the high-breathability flame-retardant moisture-conducting fiber membrane material is obtained. The high-breathability flame-retardant one-way moisture-conducting fiber membrane material has flame retardance under an extreme combustion condition, can efficiently conduct moisture in one way, is high in breathability, achieves compatibility of flame-retardant protection, moisture absorption, sweat releasing and comfort, and can be widely applied to special garment materials for fire fighting and the like.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of nanofiber membrane materials, and specifically to a highly breathable, flame-retardant, moisture-conducting fiber membrane material and a preparation method thereof. Background Art

[0002] Firefighting, emergency rescue, petrochemical industry and natural gas are potential thermal disaster environments. Heat reaching the fabric through the fabric can cause severe burns to the skin, and smoke from extreme combustion processes can easily cause skin, digestive tract and lung cancer. Therefore, it is particularly important to develop a highly comfortable, perspiration-wicking and flame-retardant textile material to reduce combustion disasters.

[0003] The 2020 master's thesis of Beijing Forestry University, "Preparation and Performance Research of Flame Retardant / Fluorescent Composite Functional Regenerated Fibers", adopted the method of blending modification to study the flame retardant and fluorescent modification of regenerated fibers in a two-component ionic liquid system. The results show that the composite fiber can maintain good fluorescent properties and flame retardant properties (the limiting oxygen index can reach 35).

[0004] Xi'an Polytechnic University's 2014 master's thesis "Research and Development Technology of Wool-Blended Combed Flame-Retardant Comfortable Fabrics" blended wool, flame-retardant fiber and aramid 1313 to produce a heat-resistant, high-strength, high-wear-resistant flame-retardant comfortable fiber. The fiber's flame-retardant performance meets the GB / T17591-2006 "Flame-Retardant Fabric" standard and has a soft and comfortable feel.

[0005] The 12th issue of "Printing and Dyeing" in 2022 published "Preparation and Flame Retardant Properties of Graphene Oxide Modified Ammonium Polyphosphate / Polyurethane Composite Fiber Membrane". Ammonium polyphosphate was modified with silane coupling agent, and then reacted with graphene oxide to obtain a composite flame retardant, which was added to the PU spinning solution to prepare a flame-retardant fiber membrane by electrospinning. The experimental results show that the flame retardant properties of the fiber membrane are significantly improved, and the damaged lengths before and after washing are 10.3cm and 16.9cm respectively.

[0006] As can be seen from the above, existing flame-retardant fibers can be prepared and processed by blending, electrospinning and finishing methods, and have good flame-retardant properties, but there is a drawback of single flame-retardant properties. In 2014, a master's thesis of Xi'an University of Technology prepared fibers with both flame-retardant and comfortable properties. However, its comfort performance was only evaluated by hand feel. In extreme combustion environments, flame retardancy and comfortable breathability are key problems that need to be solved urgently for existing protective clothing fabrics, because finishing will hinder the pore size of woven fibers. Therefore, improving breathability is currently the focus of research on flame-retardant protective clothing. Summary of the invention

[0007] To this end, the embodiment of the present invention provides a highly breathable, flame-retardant, and moisture-conducting fiber membrane material and a preparation method thereof. The fiber membrane material provided by the present invention has flame retardancy under extreme combustion conditions, can efficiently conduct moisture in a single direction, and is highly breathable, achieving flame retardancy protection and moisture absorption and perspiration comfort compatibility, and can be widely used in special clothing fabrics such as fire fighting.

[0008] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0009] According to a first aspect of an embodiment of the present invention, the present invention provides a method for preparing a highly breathable, flame-retardant, moisture-conducting fiber membrane material, the method comprising the following steps:

[0010] (1) mixing polyacrylonitrile and N,N-dimethylformamide to obtain a spinning solution;

[0011] (2) electrospinning the spinning solution to obtain a hydrophilic membrane fiber layer;

[0012] (3) immersing the hydrophilic membrane fiber layer in a dopamine solution, and then drying to obtain a polyacrylonitrile / dopamine nanofiber membrane;

[0013] (4) mixing polyurethane foam glue, foaming agent, aziridine crosslinking agent, expanded graphene, and sodium alginate, and stirring to allow the materials to be fully mixed with air to reach a foaming state, thereby obtaining a coating glue;

[0014] (5) using the coating adhesive to perform foam coating finishing on the polyacrylonitrile / dopamine nanofiber membrane, and baking to obtain a fiber layer body;

[0015] (6) mixing the TPU particles and N,N-dimethylformamide to obtain a hydrophobic solution;

[0016] (7) The hydrophobic solution is electrospinned onto the surface of the fiber layer to obtain the highly breathable, flame-retardant, and moisture-conducting fiber membrane material.

[0017] Furthermore, in step (1), the polyacrylonitrile is 10 to 16 parts by weight, and the N,N-dimethylformamide is 84 to 90 parts by weight;

[0018] The mixing conditions are as follows: continuous stirring at room temperature for 20 to 30 minutes.

[0019] Furthermore, in step (2), the conditions for the electrospinning are: spinning voltage 20-25 KV, liquid supply rate 0.6-0.8 ml / h, receiving distance 12-15 cm, and spinning time 40-60 min.

[0020] Furthermore, in step (3), the concentration of the dopamine solution is 10-12%;

[0021] The soaking conditions are: room temperature, 10 to 15 hours;

[0022] The drying condition is: 60-80°C.

[0023] Furthermore, in step (4), the polyurethane foam adhesive is 80 to 100 parts, the foaming agent is 1 to 3 parts, the aziridine cross-linking agent is 3 to 5 parts, the expanded graphene is 10 to 20 parts, and the sodium alginate is 5 to 10 parts, by weight.

[0024] The foaming state means that the volume of the mixed material increases by 1 to 3 times.

[0025] Furthermore, in step (5), the baking conditions are: baking at 130-140°C for 2-3 minutes, and the dry weight gain is 8-10 g / m 2 .

[0026] Furthermore, in step (6), the TPU particles are 15 to 20 parts by weight, and the N,N-dimethylformamide is 80 to 85 parts by weight;

[0027] The mixing conditions are: continuous stirring at 75-85° C. for 6-8 hours.

[0028] Furthermore, in step (7), the conditions for the electrospinning are: spinning voltage 35-40 KV, receiving distance 12-15 cm, liquid supply speed 0.4-0.6 ml / h, and spinning time 10-20 min.

[0029] According to a second aspect of an embodiment of the present invention, the present invention provides a highly breathable, flame-retardant, moisture-conducting fiber membrane material, which is made by the method described in any one of the above items.

[0030] The embodiments of the present invention have the following advantages:

[0031] The highly breathable, flame-retardant and moisture-conducting fiber membrane material provided by the present invention has a fiber membrane material with a Janus structure. In addition to achieving unidirectional moisture-conducting performance through the synergistic effect of Janus wetting, capillary tension and Young-Laplace force, it also has multiple properties such as high breathability and flame retardancy.

[0032] In the present invention, the base polyacrylonitrile is used as a hydrophilic layer and grafted onto the polyacrylonitrile fiber membrane by dopamine in situ growth to prepare the polyacrylonitrile / dopamine nanofiber membrane. The purpose is to increase the hydroxyl active groups on the fiber membrane surface, which can react with the crosslinking agent to improve the bonding strength between the polyacrylonitrile base membrane and the foaming coating adhesive.

[0033] The present invention adopts a water-soluble, highly moisture-permeable polyurethane foam adhesive, which contains hydroxyl and carboxyl hydrophilic functional groups. It can be miscible with sodium alginate using water as a solvent, and sodium alginate has abundant hydroxyl active groups. In the invention, an aziridine crosslinking agent is used as a trifunctional crosslinking agent to promote the crosslinking of polyurethane and sodium alginate, and play a role in stable adhesion. At the same time, expanded graphite can be highly adhered to the coating adhesive through the stable bonding effect of polyurethane and the crosslinking agent. After the fiber membrane is coated with the foaming coating adhesive, under baking conditions, the aziridine crosslinking agent can tightly combine the fiber membrane with the coating membrane. The middle polyurethane foam coating film contains a large number of hydroxyl groups, which weaken the hydrophobicity of the polyurethane coating film. Therefore, the polyacrylonitrile / dopamine nanofiber membrane, the polyurethane foam coating membrane and the TPU hydrophobic film form a super hydrophilic-weakly hydrophobic-hydrophobic gradient Janus structure composite membrane. When droplets drip from the hydrophobic side of the composite membrane, they are subjected to the synergistic effect of capillary tension, hydrophobic force and Young-Laplace force during movement, which quickly pulls the droplets from the hydrophobic side to the hydrophilic side, achieving the effect of unidirectional moisture conduction, moisture absorption and perspiration discharge. The middle polyurethane foam transition layer prevents the droplets from flowing back.

[0034] The expanded graphite used in the present invention has a flame retardant effect. Under extreme combustion conditions, its volume can expand rapidly to isolate external combustion. At the same time, the polyurethane foam coating film forms an air chamber under high temperature conditions, has a loose and porous effect, and achieves a high air permeability effect of the composite fiber membrane.

[0035] The present invention adopts an electrospinning method to prepare polyacrylonitrile / dopamine nanofiber membrane and a TPU polyurethane hydrophobic layer. The fibers are randomly overlapped and the fibers have regulated pore sizes. Therefore, after being compounded with a polyurethane foam layer, the fiber composite membrane as a whole has high air permeability.

[0036] The hydrophobic surface layer of the present invention adopts TPU as a raw material, mainly considering its excellent durability such as wear resistance and aging resistance.

[0037] The highly breathable, flame-retardant, unidirectional moisture-conducting fiber membrane material of the present invention is flame-retardant under extreme combustion conditions, can efficiently conduct moisture in a unidirectional manner, and is highly breathable, achieving compatibility between flame-retardant protection and moisture absorption and perspiration comfort, and can be widely used in special clothing fabrics such as those for firefighting. DETAILED DESCRIPTION

[0038] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Expanded graphene: The expansion ratio is 150-250 ml / g, which is a commercially available product;

[0040] Polyurethane foam glue: selected from FS-805 product of Liaoning Hengxing Fine Chemical Co., Ltd.;

[0041] Foaming agent: selected from the Italian Boset Group products, natural and synthetic latex foaming agent STOKAL STA products;

[0042] Dopamine: Commercially available product;

[0043] Sodium alginate: commercially available product;

[0044] Polyacrylonitrile: molecular weight 90,000, commercially available product;

[0045] Aziridine crosslinking agent: selected from SaC-100 product of Pandex (Shanghai) International Trading Co., Ltd.;

[0046] TPU granules: commercially available products;

[0047] In the following contents, unless otherwise specified, parts are by weight.

[0048] Example 1

[0049] This embodiment provides a highly breathable, flame-retardant, moisture-conducting fiber membrane material, and a preparation method thereof comprises the following steps:

[0050] (1) Preparation of polyacrylonitrile / dopamine nanofiber membrane

[0051] 10 parts of polyacrylonitrile were dissolved in 90 parts of N,N-dimethylformamide solvent and stirred continuously at room temperature for 20 minutes to prepare a spinning solution.

[0052] The spinning solution was injected into a syringe, and a hydrophilic membrane fiber layer consisting of spinning solution was prepared by an electrostatic spinning method: a spinning voltage of 20 KV, a liquid supply rate of 0.6 ml / h, a receiving distance of 12 cm, and a spinning time of 60 min.

[0053] The hydrophilic membrane fiber layer was placed in a dopamine aqueous solution with a mass concentration of 10%, immersed at room temperature for 10 hours, taken out, and dried at 60° C. to prepare a polyacrylonitrile / dopamine nanofiber membrane.

[0054] (2) Preparation of fiber layer

[0055] 80 parts of polyurethane foam glue, 1 part of foaming agent, and 3 parts of aziridine crosslinking agent are mixed and stirred evenly at room temperature, and then 10 parts of expanded graphene and 5 parts of sodium alginate are added. A disperser is used for high-speed stirring to fully mix the materials with air to achieve a foaming state. The volume of the mixed material increases by 1 times to obtain a coating glue.

[0056] The polyacrylonitrile / dopamine nanofiber membrane prepared in step (1) was subjected to foam coating finishing using a coating adhesive and baked at 130° C. for 2 minutes to obtain a dry weight gain of 8 g / m 2 .

[0057] (3) Preparation of highly breathable, flame-retardant, moisture-conducting fiber membrane materials

[0058] 15 parts of TPU particles were dissolved in 85 parts of N,N-dimethylformamide solvent, and stirred continuously at 75° C. for 6 hours to prepare a hydrophobic solution.

[0059] The hydrophobic solution is spun onto the fiber layer obtained in step (2) by an electrospinning method: the electrospinning voltage is 35KV, the receiving distance is 12cm, the liquid supply rate is 0.4ml / h, and the spinning time is 20min to form a hydrophobic layer, thereby preparing a finished product of a highly breathable, flame-retardant, and moisture-conducting fiber membrane material.

[0060] Example 2

[0061] This embodiment provides a highly breathable, flame-retardant, moisture-conducting fiber membrane material, and a preparation method thereof comprises the following steps:

[0062] (1) Preparation of polyacrylonitrile / dopamine nanofiber membrane

[0063] 11 parts of polyacrylonitrile were dissolved in 89 parts of N,N-dimethylformamide solvent and stirred continuously at room temperature for 22 minutes to prepare a spinning solution.

[0064] The spinning solution was injected into a syringe, and a hydrophilic membrane fiber layer consisting of spinning solution was prepared by an electrostatic spinning method: spinning voltage 22KV, liquid supply speed 0.7ml / h, receiving distance 13cm, spinning time 55min.

[0065] The hydrophilic membrane fiber layer was placed in a dopamine aqueous solution with a mass concentration of 10.5%, immersed at room temperature for 12 hours, taken out, and dried at 65° C. to prepare a polyacrylonitrile / dopamine nanofiber membrane.

[0066] (2) Preparation of fiber layer

[0067] Mix 85 parts of polyurethane foam glue, 1.5 parts of foaming agent, and 3.5 parts of aziridine crosslinking agent at room temperature and stir evenly, then add 12 parts of expanded graphene and 6 parts of sodium alginate, use a disperser to stir at high speed to fully mix the materials with air to achieve a foaming state, and increase the volume of the mixed material by 1.5 times to obtain a coating glue.

[0068] The polyacrylonitrile / dopamine nanofiber membrane prepared in step (1) was subjected to foam coating finishing using a coating adhesive and baked at 135° C. for 2.5 minutes to obtain a dry weight gain of 8 g / m 2 .

[0069] (3) 16 parts of TPU particles were dissolved in 84 parts of N,N-dimethylformamide solvent and stirred continuously at 80° C. for 6.5 hours to prepare a hydrophobic solution.

[0070] By means of an electrospinning method: the electrospinning voltage is 37KV, the receiving distance is 13cm, the liquid supply rate is 0.4ml / h, and the spinning time is 18min, the hydrophobic solution is spun onto the fiber layer of step (2) by means of an electrospinning method to form a hydrophobic layer, thereby preparing a finished product of a highly breathable, flame-retardant, and moisture-conducting fiber membrane material.

[0071] Example 3

[0072] This embodiment provides a highly breathable, flame-retardant, moisture-conducting fiber membrane material, and a preparation method thereof comprises the following steps:

[0073] (1) Preparation of polyacrylonitrile / dopamine nanofiber membrane

[0074] 12 parts of polyacrylonitrile were dissolved in 88 parts of N,N-dimethylformamide solvent and stirred continuously at room temperature for 25 minutes to prepare a spinning solution.

[0075] The spinning solution was injected into a syringe, and a hydrophilic membrane fiber layer consisting of spinning solution was prepared by an electrospinning method: a spinning voltage of 23 KV, a liquid supply rate of 0.7 ml / h, a receiving distance of 13 cm, and a spinning time of 50 min.

[0076] The hydrophilic membrane fiber layer was placed in a dopamine aqueous solution with a mass concentration of 11%, immersed at room temperature for 13 hours, taken out, and dried at 70° C. to prepare a polyacrylonitrile / dopamine nanofiber membrane.

[0077] (2) Preparation of fiber layer

[0078] 90 parts of polyurethane foam glue, 2 parts of foaming agent, and 4 parts of aziridine crosslinking agent are mixed and stirred evenly at room temperature, and then 14 parts of expanded graphene and 7 parts of sodium alginate are added. A disperser is used for high-speed stirring to fully mix the materials with air to achieve a foaming state. The volume of the mixed material increases by 2 times to obtain a coating glue.

[0079] The polyacrylonitrile / dopamine nanofiber membrane prepared in step (1) was subjected to foam coating finishing using a coating adhesive and baked at 130° C. for 3 minutes to obtain a dry weight gain of 9 g / m 2 .

[0080] (3) Preparation of highly breathable, flame-retardant, moisture-conducting fiber membrane materials

[0081] 17 parts of TPU particles were dissolved in 83 parts of N,N-dimethylformamide solvent, and stirred continuously at 80° C. for 7 hours to prepare a hydrophobic solution.

[0082] The hydrophobic solution is spun onto the fiber layer of step (2) by electrospinning method: spinning voltage is 38KV, receiving distance is 14cm, liquid supply speed is 0.5ml / h, spinning time is 16min, and a hydrophobic layer is formed to prepare a highly breathable, flame-retardant and moisture-conducting fiber membrane material product.

[0083] Example 4

[0084] This embodiment provides a highly breathable, flame-retardant, moisture-conducting fiber membrane material, and a preparation method thereof comprises the following steps:

[0085] (1) Preparation of polyacrylonitrile / dopamine nanofiber membrane

[0086] 14 parts of polyacrylonitrile were dissolved in 86 parts of N,N-dimethylformamide solvent and stirred continuously at room temperature for 28 minutes to prepare a spinning solution.

[0087] The spinning solution was injected into a syringe, and a hydrophilic membrane fiber layer consisting of spinning solution was prepared by an electrostatic spinning method: spinning voltage was 24 KV, liquid supply speed was 0.8 ml / h, receiving distance was 14 cm, spinning time was 45 min.

[0088] The hydrophilic membrane fiber layer was placed in a dopamine aqueous solution with a mass concentration of 11%, immersed at room temperature for 14 hours, taken out, and dried at 75° C. to prepare a polyacrylonitrile / dopamine nanofiber membrane.

[0089] (2) Preparation of fiber layer

[0090] 95 parts of polyurethane foam glue, 2.5 parts of foaming agent, and 4.5 parts of aziridine crosslinking agent were mixed and stirred evenly at room temperature, and then 16 parts of expanded graphene and 8 parts of sodium alginate were added. A disperser was used for high-speed stirring to fully mix the materials with air to achieve a foaming state. The volume of the mixed material increased by 2.5 times to obtain a coating glue.

[0091] The polyacrylonitrile / dopamine nanofiber membrane prepared in step (1) was subjected to foam coating finishing using a coating adhesive and baked at 140° C. for 2 minutes to obtain a dry weight gain of 9 g / m 2 .

[0092] (3) Preparation of highly breathable, flame-retardant, moisture-conducting fiber membrane materials

[0093] 18 TPU particles were dissolved in 82 parts of N,N-dimethylformamide solvent and stirred continuously at 80° C. for 7.5 hours to prepare a hydrophobic solution.

[0094] The hydrophobic solution is spun onto the fiber layer of step (2) by electrospinning method with the spinning voltage of 39KV, receiving distance of 15cm, liquid supply speed of 0.5ml / h and spinning time of 12min to form a hydrophobic layer, thereby preparing a finished product of a highly breathable, flame-retardant and moisture-conducting fiber membrane material.

[0095] Example 5

[0096] This embodiment provides a highly breathable, flame-retardant, moisture-conducting fiber membrane material, and a preparation method thereof comprises the following steps:

[0097] (1) Preparation of polyacrylonitrile / dopamine nanofiber membrane

[0098] 16 parts of polyacrylonitrile were dissolved in 84 parts of N,N-dimethylformamide solvent and stirred continuously at room temperature for 30 minutes to prepare a spinning solution.

[0099] The spinning solution was injected into a syringe, and a hydrophilic membrane fiber layer consisting of spinning solution was prepared by an electrostatic spinning method: a spinning voltage of 25 KV, a liquid supply rate of 0.8 ml / h, a receiving distance of 15 cm, and a spinning time of 40 min.

[0100] The hydrophilic membrane fiber layer was placed in a dopamine aqueous solution with a mass concentration of 12%, immersed at room temperature for 15 hours, taken out, and dried at 80° C. to prepare a polyacrylonitrile / dopamine nanofiber membrane.

[0101] (2) Preparation of fiber layer

[0102] 100 parts of polyurethane foam glue, 3 parts of foaming agent, and 5 parts of aziridine crosslinking agent are mixed and stirred evenly at room temperature, and then 20 parts of expanded graphene and 10 parts of sodium alginate are added, and a disperser is used for high-speed stirring to fully mix the materials with air to achieve a foaming state, so that the volume of the mixed material is increased by 3 times to obtain a coating glue.

[0103] The polyacrylonitrile / dopamine nanofiber membrane prepared in step (1) was subjected to foam coating finishing using a coating adhesive, and baked at 140° C. for 3 minutes to obtain a dry weight gain of 10 g / m 2 .

[0104] (3) Preparation of highly breathable, flame-retardant, moisture-conducting fiber membrane materials

[0105] 20 parts of TPU particles were dissolved in 80 parts of N,N-dimethylformamide solvent, and stirred continuously at 85° C. for 8 hours to prepare a hydrophobic solution.

[0106] The hydrophobic solution is spun onto the fiber layer of step (2) by electrospinning method with the following steps: spinning voltage 40KV, receiving distance 15cm, liquid supply speed 0.6ml / h, spinning time 10min, to form a hydrophobic layer, thereby preparing a highly breathable, flame-retardant and moisture-conducting fiber membrane material product.

[0107] Test Example 1

[0108] Water vapor permeability test: Tested in accordance with GB / T12704.2-2009 standard;

[0109] Cumulative one-way transmission index and liquid water dynamic transmission index: tested according to AATCC195 standard;

[0110] Limiting oxygen index test: Tested according to GB / T5454-1997 Textile combustion performance test oxygen index method;

[0111] Flame retardant performance (damage length, smoldering and after-flaming) test: in accordance with GB / T5455-1997;

[0112] Air permeability test: Tested in accordance with GB / T5453-1997 standard.

[0113] The finished products prepared in Examples 1-5 were subjected to the above-mentioned performance tests and compared with nylon flame retardant products on the market. The results are shown in Table 1 below.

[0114] Table 1

[0115]

[0116]

[0117] The results show that the composite fiber membrane material of the present invention has good flame retardancy, unidirectional moisture conduction, moisture permeability and air permeability, and has excellent comprehensive performance.

[0118] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for preparing a highly breathable, flame-retardant, moisture-conducting fiber membrane material, characterized in that: The method comprises the following steps: (1) mixing polyacrylonitrile and N,N-dimethylformamide to obtain a spinning solution; (2) electrospinning the spinning solution to obtain a hydrophilic membrane fiber layer; (3) immersing the hydrophilic membrane fiber layer in a dopamine solution, and then drying to obtain a polyacrylonitrile / dopamine nanofiber membrane; (4) mixing polyurethane foam glue, foaming agent, aziridine crosslinking agent, expanded graphene, and sodium alginate, and stirring to allow the materials to be fully mixed with air to reach a foaming state, thereby obtaining a coating glue; (5) using the coating adhesive to perform foam coating finishing on the polyacrylonitrile / dopamine nanofiber membrane, and baking to obtain a fiber layer body; (6) mixing the TPU particles and N,N-dimethylformamide to obtain a hydrophobic solution; (7) The hydrophobic solution is electrospinned onto the surface of the fiber layer to obtain the highly breathable, flame-retardant, and moisture-conducting fiber membrane material.

2. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (1), In terms of weight, the polyacrylonitrile is 10 to 16 parts, and the N,N-dimethylformamide is 84 to 90 parts; The mixing conditions are as follows: continuous stirring at room temperature for 20 to 30 minutes.

3. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (2), The conditions of the electrostatic spinning are: spinning voltage 20-25 KV, liquid supply speed 0.6-0.8 ml / h, receiving distance 12-15 cm, spinning time 40-60 min.

4. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (3), The mass concentration of the dopamine solution is 10-12%; The soaking conditions are: room temperature, 10 to 15 hours; The drying condition is: 60-80°C.

5. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (4), In parts by weight, the polyurethane foam adhesive is 80 to 100 parts, the foaming agent is 1 to 3 parts, the aziridine cross-linking agent is 3 to 5 parts, the expanded graphene is 10 to 20 parts, and the sodium alginate is 5 to 10 parts; The foaming state means that the volume of the mixed material increases by 1 to 3 times.

6. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (5), The baking conditions are: baking at 130-140°C for 2-3 minutes, dry weight gain of 8-10 g / m 2 .

7. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (6), In terms of weight, the TPU particles are 15 to 20 parts, and the N,N-dimethylformamide is 80 to 85 parts; The mixing conditions are: continuous stirring at 75-85° C. for 6-8 hours.

8. The method for preparing the highly breathable, flame-retardant, moisture-conducting fiber membrane material according to claim 1, characterized in that: In step (7), The conditions of the electrostatic spinning are: spinning voltage 35-40 KV, receiving distance 12-15 cm, liquid supply speed 0.4-0.6 ml / h, spinning time 10-20 min.

9. A highly breathable, flame-retardant, moisture-conducting fiber membrane material, characterized in that: The method is prepared by the method according to any one of claims 1 to 8.

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