Reusable nanofiber laminated composite medical protective clothing fabric and preparation method thereof

Abstract

The present invention provides a reusable nanofiber laminated composite medical protective clothing fabric and a preparation method thereof. The reusable nanofiber laminated composite medical protective clothing fabric is composed of a woven outer layer fabric containing conductive fibers, an electrospun super-hydrophobic nanofiber membrane with a pleated structure, and a woven inner layer fabric with a unidirectional moisture conduction function. The layers of fabric are bonded together by hot melt adhesive mesh bonding and lamination technology. The prepared nanofiber laminated composite fabric has a hydrostatic pressure resistance of 30-55kPa before disinfection and sterilization, a synthetic blood penetration resistance level of 3-4, and a moisture permeability of 5000-7000g / m 2 / d, after 20 times of pressure steam sterilization, the fabric can still withstand hydrostatic pressure of 20-40kPa, with a synthetic blood penetration level of 3-4 and a moisture permeability of 4000-7000g / m 2 / d.

Description

Technical Field

[0001] The present invention relates to the technical field of medical protective materials, and in particular to a reusable nanofiber laminated composite medical protective clothing fabric and a preparation method thereof. Background Art

[0002] The "use-and-disposable" nature of disposable protective clothing creates significant medical waste disposal challenges. Currently, high-temperature incineration is often used to dispose of discarded protective clothing, which can easily cause air pollution and pose a risk of infection to workers during waste disposal. Increasing the use of medical protective clothing and developing reusable medical protective clothing can mitigate medical waste pollution at its source, effectively alleviating the problem of discarded protective materials, and ultimately saving resources and protecting the environment. Therefore, there is an urgent need to develop new medical protective clothing fabrics that are both highly protective and reusable.

[0003] Medical protective clothing fabrics must first have excellent protective properties, effectively blocking the penetration of external liquid water, blood, and aerosols, reducing the risk of infection in infectious environments. Medical protective clothing fabrics must also have excellent physical and mechanical properties and comfort, with good air permeability and moisture permeability to improve the wearing comfort of medical staff. Currently, protective clothing materials on the market, such as 3M's spunbond base fabric polyethylene coating material, have a moisture permeability of only 40g / m 2 / d, and the ideal moisture permeability of medical protective clothing fabrics should be no less than 2500 g / m 2 / d, so moisture and heat generated by the body during wear cannot be discharged in a timely manner, affecting the health and work efficiency of medical staff. Electrospun nanofiber membranes have the advantages of fine fiber diameter, small pore size, and high porosity. They can simultaneously provide excellent barrier protection and breathability and moisture permeability, making them the most promising material for medical protective clothing.

[0004] Reusable medical protective clothing refers to medical protective clothing that can still provide effective protection after necessary washing and disinfection treatments after use. Compared with disposable medical protective clothing, reusable protective clothing can effectively solve the problem of shortage of protective clothing supply and demand and reduce the pollution of medical waste to the environment, but at the same time it puts higher requirements on the physical and mechanical properties and durability of the materials. At present, the disinfection and sterilization methods in the medical industry mainly include pressure steam sterilization, ethylene oxide gas sterilization, irradiation sterilization, chlorine-containing disinfectant sterilization, and 75% ethanol sterilization. The existing patented technology improves the water and blood repellency of the nanofiber membrane by impregnating the nanofiber membrane with a fluorocarbon finishing agent, but multiple washing and disinfection treatments will reduce the water repellency of the finishing agent, resulting in a decrease in the protective performance of the nanofiber membrane, which cannot meet the requirements of reusability. In addition, the physical and mechanical properties of a single-layer nanofiber membrane are poor, and its dimensional stability and fabric integrity cannot be guaranteed after multiple washing and disinfection treatments.

[0005] Patent CN111575904B "Super-elastic, waterproof, breathable skin dressing with a pleated structure and its preparation method" regulates the difference in cross-linking density in the two layers of electrospun fiber membranes to make the thermal shrinkage rates of the upper and lower fiber membranes different. Under the action of external temperature, a super-elastic, waterproof, breathable skin dressing with a pleated structure is obtained. The hydrostatic pressure resistance of the skin dressing is 5-50 KPa. The materials and preparation methods of the above patents are essentially different from those of the present invention. In addition, this method requires the preparation of an upper and lower double-layer membrane structure first, and the thermal shrinkage rate of the fiber membrane is difficult to accurately control.

[0006] Patent CN115672053A, "A super-hydrophobic fiber membrane with a wrinkled structure and its preparation", grows a wrinkled micro-nanostructure on the surface of a polypropylene fiber membrane by covalent grafting. The patent only discloses that the water contact angle of the fiber membrane is 151-154°, and the water retention rate in oil-water separation can reach more than 99%. The patent does not examine the hydrostatic pressure resistance of the fiber membrane.

[0007] Patent CN111501325B, "A Surface-Corrugated Fiber Material and Its Preparation Method," forms a coating of a resin coating liquid composed of a resin and a diluent on a material substrate. Plasma treatment is then used to in-situ crosslink the coating, creating annular wrinkles along the fiber axis. The materials and preparation methods of this patent differ fundamentally from those of the present invention. This patent only discloses that the fabric has a water contact angle greater than 150° and does not examine its hydrostatic pressure resistance.

[0008] Patent CN114804648A, "A Fluorine-Free Self-Cleaning Coating, Preparation Method, and Application thereof," utilizes the wrinkled structure of graphene combined with nano-silica to construct a micro-nanostructure to produce a super-hydrophobic, self-cleaning coating. The materials and preparation methods of this patent differ fundamentally from those of the present invention. The patent only discloses a water contact angle of 150-165° for the fiber membrane and does not examine the hydrostatic pressure resistance of the fiber membrane. Summary of the Invention

[0009] The purpose of the present invention is to solve the problem that the protective performance of the existing electrospun nanofiber membrane decreases and the reusability is poor after multiple washing and disinfection treatments, and to provide a reusable nanofiber laminated composite medical protective clothing fabric and a preparation method thereof.

[0010] The present invention adopts a solvent-heat induction method to construct a stable wrinkle structure on the surface of electrospun nanofibers. Under the combined action of solvent and heating, the nanofibers swell, and differential thermal expansion behavior will occur on the surface and inside of the nanofibers. When the strain at the interface between the fiber surface and the interior is greater than the wrinkling strain, in order to keep the system energy at a minimum, a wrinkle structure is formed on the surface of the nanofiber, and then the nanofiber membrane with the wrinkle structure is impregnated and finished with a hydrophobic agent. The introduction of the wrinkle structure greatly improves the hydrophobicity of the nanofiber membrane, so that it can still effectively block the penetration of external liquid water and blood after disinfection. The hydrophobic nanofiber layer is compounded with a woven outer layer fabric containing antistatic fibers and a unidirectional moisture-conducting woven inner layer fabric using hot melt adhesive mesh bonding and lamination technology to obtain a nanofiber laminated composite fabric with a sandwich structure. After multiple disinfection and sterilization treatments, the nanofiber laminated composite fabric still has excellent hydrophobicity and mechanical properties, can effectively block the penetration of external liquid water and blood, and has good moisture permeability. The fabric can be reused after multiple disinfections.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] A reusable nanofiber laminated composite medical protective clothing fabric consists of a woven outer fabric containing conductive fibers, an electrospun pleated super-hydrophobic nanofiber membrane, and a woven inner fabric with a unidirectional moisture-conducting function. The layers of fabric are bonded together using hot-melt adhesive mesh bonding and lamination technology to form a nanofiber laminated composite fabric with a sandwich structure.

[0013] The wrinkled super-hydrophobic nanofiber membrane is prepared according to the following steps:

[0014] (1) Dissolve the polymer in a solvent, stir thoroughly to obtain a spinning solution, and prepare a nanofiber membrane by electrospinning technology;

[0015] (2) Place the nanofiber membrane in a high-pressure hydrothermal reactor, add hydrochloric acid, deionized water and a small amount of alcohol solvent into the reactor, immerse the nanofiber membrane in the solution, take out the nanofiber membrane after a period of high-temperature reaction, and repeatedly rinse the nanofiber membrane with deionized water;

[0016] (3) impregnating the nanofiber membrane with a hydrophobic agent and then drying the nanofiber membrane;

[0017] The polymer in step (1) is polyvinylidene fluoride, polyimide, polyetherimide, polyethersulfone or polysulfone; the solvent is one or more of N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, dimethyl sulfoxide, cyclohexane, dichloromethane and chloroform; the polymer concentration in the spinning solution is 10-30wt%.

[0018] The electrospinning process parameters in step (1) are: spinning voltage 10-30 kV, solution infusion speed 0.5-5 ml / h, receiving distance 5-30 cm, ambient temperature 10-30° C., and relative humidity 20-60%.

[0019] The concentration of hydrochloric acid in step (2) is 36-38%; the alcohol solvent is ethanol, n-butanol, propylene glycol, or isopropanol, and the mass fraction of the alcohol solvent in the deionized water in the high-pressure reactor is 3%-10%; the reaction temperature in step (2) is 120-160° C., and the reaction time is 4-8 hours; after the nanofiber membrane is taken out, it is rinsed with deionized water 3-5 times.

[0020] In the preparation method as described above, the hydrophobic agent is fluorine-containing acrylate, fluorine-free acrylic acid, polydimethylsiloxane or polydimethylhydroxysiloxane.

[0021] The weight of the wrinkled super-hydrophobic nanofiber membrane is 20-60 g / m 2 The fiber diameter is 100-1000nm, the average pore size is 0.5-2.0μm, the porosity is 50-90%, the water contact angle is 150-160°, the hydrostatic pressure resistance is 10-50KPa, the synthetic blood penetration resistance level is 3-4, and the moisture permeability is 5000-7000g / m 2 / d.

[0022] Based on the pleated super-hydrophobic nanofiber membrane, the present invention provides a reusable nanofiber laminated composite medical protective clothing fabric, which is composed of an outer layer of woven fabric containing conductive fibers, an intermediate layer of pleated super-hydrophobic nanofiber membrane and an inner layer of unidirectional moisture-conducting woven fabric, which are composited through hot melt adhesive mesh bonding and lamination technology.

[0023] The reusable nanofiber laminated composite medical protective clothing fabric is prepared according to the following method:

[0024] (1) placing a hot melt adhesive mesh between the outer woven fabric and the middle nanofiber membrane, and between the middle nanofiber membrane and the inner woven fabric;

[0025] (2) The outer layer woven fabric, the middle layer nanofiber membrane, the inner layer woven fabric and the hot melt adhesive mesh are placed together in the cloth placement area of ​​the hot press, and the fabrics are compounded through a lamination process.

[0026] In the preparation method described above, the hot melt adhesive web is polyamide, polyethersulfone, thermoplastic polyurethane or ethylene-vinyl acetate copolymer.

[0027] The preparation method as described above has the following lamination process parameters: hot pressing temperature 80-150° C., pressure 0.5-3 MPa, and hot pressing time 1-5 minutes.

[0028] As described above, the outer woven fabric is a woven fabric made of cotton fiber, polyester fiber, viscose fiber or other fibers alone or in combination with conductive fiber, wherein the conductive fiber can be metal conductive fiber, carbon conductive fiber or organic polymer conductive fiber.

[0029] In the preparation method described above, the inner layer of the one-way moisture-conducting woven fabric is made of special-section polyester fibers, hollow porous polyester fibers, fine-denier polyester fibers or fine-denier polypropylene fibers.

[0030] The reusable nanofiber laminated composite medical protective clothing fabric prepared by the present invention has a hydrostatic pressure resistance of 30-55kPa before disinfection and sterilization, a synthetic blood penetration resistance level of 3-4, and a moisture permeability of 5000-7000g / m 2 / d, after 20 times of pressure steam sterilization (temperature 121℃, pressure 102.9kPa) on the nanofiber laminated composite medical protective clothing fabric, the fabric's hydrostatic pressure resistance can still reach 20-40kPa, the synthetic blood penetration resistance level is 3-4, and the moisture permeability is 4000-7000 g / m 2 / d.

[0031] Beneficial effects:

[0032] The present invention prepares a reusable nanofiber laminated composite medical protective clothing fabric, which is laminated and composited with a pleated super-hydrophobic nanofiber membrane, an outer layer of woven fabric containing antistatic fibers, and an inner layer of unidirectional moisture-conducting woven fabric; the pleated structure on the surface of the nanofiber can increase the surface roughness of the fiber, greatly improving the hydrophobicity of the nanofiber membrane, effectively preventing the penetration of external liquid water and blood, and still having good protective performance after multiple disinfection and sterilization; the outer layer of woven fabric containing conductive fibers can effectively avoid static electricity accumulation, while providing sufficient breaking strength, tearing strength, wear resistance and puncture resistance; the inner layer of unidirectional moisture-conducting woven fabric has good air permeability and moisture permeability, which can improve the wearing comfort of the fabric.

[0033] The reusable nanofiber laminated composite medical protective clothing fabric prepared by the present invention combines high protection, high moisture permeability and reusability. It can withstand more than 20 disinfection and sterilization processes without obvious changes in the appearance of the fabric. In addition, the hydrostatic pressure resistance, synthetic blood penetration resistance and moisture permeability indicators can still meet the GB19082-2009 "Technical Requirements for Medical Disposable Protective Clothing". BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The invention discloses a reusable nanofiber laminated composite medical protective clothing fabric.

[0035] Among them: 1- woven outer fabric containing conductive fibers; 2- electrospun pleated super-hydrophobic nanofiber membrane; 3- woven inner fabric with unidirectional moisture conduction function. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] The hot melt adhesive webs in the examples are all manufactured by Shanghai Xingxia Polymer Products Co., Ltd. The brand number of the polyamide hot melt adhesive web in Example 1 is XWA116, and the brand number of the thermoplastic polyurethane hot melt adhesive web in Examples 2 and 3 is HWU98.

[0038] Example 1

[0039] Reference Figure 1 As shown, this embodiment discloses a reusable nanofiber laminated composite medical protective clothing fabric, which is composed of a woven outer fabric 1 containing conductive fibers, an electrospun pleated super-hydrophobic nanofiber membrane 2, and a woven inner fabric 3 with a unidirectional moisture conduction function. The layers of fabric are bonded together by hot-melt adhesive mesh bonding and lamination technology to form a nanofiber laminated composite fabric with a sandwich structure.

[0040] The preparation method of reusable nanofiber laminated composite medical protective clothing fabric is as follows:

[0041] (1) Polyetherimide was dissolved in N-methylpyrrolidone and magnetically stirred for 8 h to obtain a spinning solution with a mass concentration of 20 wt%. The spinning solution was placed in a liquid supply device and connected to a high-voltage power supply. The electrospinning process parameters were as follows: spinning voltage 25 kV, receiving distance 20 cm, solution perfusion rate 0.8 mL / h, ambient temperature 20 °C, and relative humidity 40%.

[0042] (2) Add 36% concentration of hydrochloric acid, deionized water and n-butanol into a high-pressure hydrothermal reactor. The mass ratio of hydrochloric acid to deionized water is 1:1, and the mass fraction of n-butanol to deionized water is 3%. Immerse the polyetherimide in the solution and react at 140°C for 4 hours. Take out the nanofiber membrane and rinse it with deionized water three times.

[0043] (3) Soaking the polyetherimide nanofiber membrane in a fluorinated acrylate emulsion for 0.5 h, where the fluorinated acrylate concentration in the emulsion is 2 wt%, then taking out the nanofiber membrane and drying it at 60 °C for 2 h;

[0044] The fluorinated acrylic emulsion used was Novec-1700, a product purchased from 3M Company;

[0045] (4) A polyamide hot melt adhesive mesh was placed between the polyetherimide nanofiber membrane, the plain weave outer layer made of a polyester filament / silver-plated fiber blend, and the plain weave inner layer made of fine-denier polypropylene and laminated. The hot pressing temperature was 135°C, the pressure was 0.5 MPa, and the hot pressing time was 1 min.

[0046] The final reusable nanofiber laminated composite medical protective clothing fabric has a hydrostatic pressure resistance of 40kPa, a synthetic blood penetration resistance level of 4, and a moisture permeability of 5200 g / m 2 / d, after 10 times of pressure steam sterilization (temperature 121 ° C, pressure 102.9 kPa) on the nanofiber laminated composite medical protective clothing fabric, the fabric's hydrostatic pressure resistance can still reach 30 kPa, the synthetic blood penetration level is 4, and the moisture permeability is 5000 g / m 2 / d.

[0047] Comparative Example 1

[0048] The preparation method of reusable nanofiber laminated composite medical protective clothing fabric is basically the same as that of Example 1, except that step (2) is not performed, and the surface of the prepared nanofiber membrane does not have a wrinkle structure. The nanofiber laminated composite fabric finally prepared has a hydrostatic pressure resistance of 35 kPa, a synthetic blood penetration resistance level of 4, and a moisture permeability of 4900 g / m 2 / d, after 10 times of pressure steam sterilization (temperature 121 ° C, pressure 102.9 kPa) on the nanofiber laminated composite medical protective clothing fabric, the fabric's hydrostatic pressure resistance is 15 kPa, the synthetic blood penetration level is 4, and the moisture permeability is 4800 g / m 2 / d; Comparing Comparative Example 1 with Example 1, it can be seen that the hydrostatic pressure resistance of the fabric after 10 pressure steam sterilizations is significantly lower than that of Example 1. This is because the surface of the nanofiber membrane in Comparative Example 1 does not have a wrinkled structure, and the nanofiber membrane is only made hydrophobic by impregnation with a hydrophobic agent. However, the water repellency of the hydrophobic agent is weakened after 10 pressure steam sterilizations, resulting in a significant decrease in the hydrostatic pressure resistance of the fabric after multiple disinfections and sterilizations.

[0049] Example 2

[0050] The preparation method of reusable nanofiber laminated composite medical protective clothing fabric comprises the following steps:

[0051] (1) Dissolve polyvinylidene fluoride in N,N-dimethylformamide and stir magnetically at 60°C for 8 h to obtain a spinning solution with a mass concentration of 18 wt%. Place the spinning solution in a liquid supply device and connect it to a high-voltage power supply. The electrospinning process parameters are as follows: spinning voltage 20 kV, receiving distance 20 cm, solution perfusion rate 1 mL / h, ambient temperature 20°C, and relative humidity 40%.

[0052] (2) Hydrochloric acid, deionized water, and n-butanol were added to a high-pressure hydrothermal reactor. The mass ratio of hydrochloric acid to deionized water was 1:1, and the mass fraction of n-butanol to deionized water was 4%. Polyvinylidene fluoride was immersed in the solution and reacted at 150°C for 4 hours. The nanofiber membrane was taken out and rinsed with deionized water three times.

[0053] (3) Soaking the polyvinylidene fluoride nanofiber membrane in polydimethylsiloxane for 0.5 h, then taking out the nanofiber membrane and drying it;

[0054] (4) A thermoplastic polyurethane hot melt adhesive web was placed between the polyvinylidene fluoride nanofiber membrane, the plain weave woven outer layer made of a blend of cotton fiber / polyester filament / silver-plated fiber, and the plain weave woven inner layer made of heterogeneous cross-section polyester fiber, and laminated. The hot pressing temperature was 140°C, the pressure was 1 MPa, and the hot pressing time was 1 min.

[0055] The final reusable nanofiber laminated composite medical protective clothing fabric has a hydrostatic pressure resistance of 38kPa, a synthetic blood penetration resistance level of 4, and a moisture permeability of 5500 g / m 2 / d, after 20 times of pressure steam sterilization (temperature 121 ° C, pressure 102.9 kPa) on the nanofiber laminated composite medical protective clothing fabric, the fabric's hydrostatic pressure resistance can still reach 27 kPa, the synthetic blood penetration level is 4, and the moisture permeability is 5300 g / m 2 / d.

[0056] Example 3

[0057] The preparation method of reusable nanofiber laminated composite medical protective clothing fabric comprises the following steps:

[0058] (1) Polyethersulfone was dissolved in N,N-dimethylacetamide and magnetically stirred for 8 h to obtain a spinning solution with a mass concentration of 18 wt%. The spinning solution was placed in a liquid supply device and connected to a high-voltage power supply. The electrospinning process parameters were as follows: spinning voltage 25 kV, receiving distance 20 cm, solution perfusion rate 1 mL / h, ambient temperature 20 °C, and relative humidity 40%.

[0059] (2) Hydrochloric acid, deionized water, and ethanol were added to a high-pressure hydrothermal reactor. The mass ratio of hydrochloric acid to deionized water was 1:1, and the mass fraction of ethanol to deionized water was 5%. Polyethersulfone was immersed in the solution and reacted at 150°C for 4 hours. The nanofiber membrane was taken out and rinsed with deionized water three times.

[0060] (3) Soaking the polyethersulfone nanofiber membrane in polydimethylhydroxysiloxane for 0.5 h, then taking out the nanofiber membrane and drying it;

[0061] (4) A thermoplastic polyurethane hot melt adhesive mesh was placed between the polyethersulfone nanofiber membrane, the twill weave outer layer made of a cotton fiber / silver-plated fiber blend, and the twill weave inner layer made of a hollow porous polyester fiber and laminated. The hot pressing temperature was 100°C, the pressure was 1 MPa, and the hot pressing time was 0.5 min.

[0062] The final reusable nanofiber laminated composite medical protective clothing fabric has a hydrostatic pressure resistance of 45kPa, a synthetic blood penetration resistance level of 4, and a moisture permeability of 6200 g / m 2 / d, after 15 times of pressure steam sterilization (temperature 121 ° C, pressure 102.9 kPa) on the nanofiber laminated composite medical protective clothing fabric, the fabric's hydrostatic pressure resistance can still reach 30 kPa, the synthetic blood penetration level is level 4, and the moisture permeability is 5900 g / m 2 / d.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reusable nanofiber laminated composite medical protective clothing fabric, characterized in that: The outer layer is a woven fabric containing conductive fibers, the middle layer is an electrospun pleated super-hydrophobic nanofiber membrane, and the inner layer is a woven fabric with a unidirectional moisture-conducting function. The layers of fabric are bonded together by hot-melt adhesive and lamination technology. Before disinfection and sterilization, the fabric has a hydrostatic pressure resistance of 30-55kPa, a synthetic blood penetration resistance level of 3-4, and a moisture permeability of 5000-7000g / m 2 / d, after 20 times of pressure steam sterilization of nanofiber laminated composite medical protective clothing fabric at 120℃ and 102.9kPa, the hydrostatic pressure resistance of the fabric can still reach 20-40kPa, the anti-synthetic blood penetration level is 3-4, and the moisture permeability is 4000-7000 g / m 2 / d; The wrinkled super-hydrophobic nanofiber membrane is prepared according to the following steps: (1) Dissolve the polymer in a solvent, stir thoroughly to obtain a spinning solution, and prepare the nanofiber membrane by electrospinning technology; (2) Place the nanofiber membrane in a high-pressure hydrothermal reactor, add hydrochloric acid, deionized water and a small amount of alcohol solvent into the reactor, immerse the nanofiber membrane in the solution, take out the nanofiber membrane after a period of high-temperature reaction, and repeatedly rinse the nanofiber membrane with deionized water; (3) impregnating the nanofiber membrane with a hydrophobic agent and then drying the nanofiber membrane; Wherein, the alcohol solvent in step (2) is one or more of ethanol, n-butanol, propylene glycol or isopropanol, the alcohol solvent accounts for 3%-10% of the mass fraction of deionized water in the high-pressure reactor, the reaction temperature is 120-160°C, and the reaction time is 4-8 hours.

2. The reusable nanofiber laminated composite medical protective clothing fabric according to claim 1, characterized in that: The hydrophobic agent in step (3) is one or more of fluorinated acrylate, polydimethylsiloxane or polydimethylhydroxysiloxane.

3. A method for preparing the reusable nanofiber laminated composite medical protective clothing fabric according to claim 1, characterized in that: The steps include: (1) placing a hot melt adhesive mesh between the outer woven fabric and the middle nanofiber membrane, and between the middle nanofiber membrane and the inner woven fabric; (2) placing the outer layer woven fabric, the middle layer nanofiber membrane, the inner layer woven fabric and the hot melt adhesive mesh together in the cloth placing area of ​​the hot press, and compounding the fabrics through a lamination process; Wherein, the hot melt adhesive mesh in step (1) is one or more of polyamide, polyethersulfone, thermoplastic polyurethane or ethylene-vinyl acetate copolymer.

4. The method for preparing the reusable nanofiber laminated composite medical protective clothing fabric according to claim 3, characterized in that: The lamination process parameters in step (2) are: hot pressing temperature 80-150°C, pressure 0.5-3MPa, and hot pressing time 1-5min.

5. The method for preparing the reusable nanofiber laminated composite medical protective clothing fabric according to claim 3, characterized in that: The outer layer woven fabric is a woven fabric made of cotton fiber, polyester fiber, viscose fiber alone or in combination with conductive fiber, wherein the conductive fiber is metal conductive fiber, carbon conductive fiber or organic polymer conductive fiber; the inner layer unidirectional moisture-conducting woven fabric is made of special-section polyester fiber, hollow porous polyester fiber, fine denier polyester or fine denier polypropylene fiber.

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