A nano-fishing net structure waterproof and moisture permeable film and a preparation method and application thereof

Abstract

The application discloses a kind of nano fishing net structure waterproof moisture-permeable film and its preparation method and application, belong to electrostatic spinning functional material technical field technical field.The nano fishing net structure waterproof moisture-permeable film described in the application includes nanofiber base layer and nanofishing net layer attached on the nanofiber base layer;The nanofiber base layer is made of nanofiber film of polymer A;The nanofishing net layer is formed by polymer C phase separation;The thickness of the nanofiber base layer is 30-100 μm.Compared with electrostatic spinning nanofiber film, the composite film has high porosity and smaller pore size, high porosity can ensure the rapid transmission of water vapor, small pore size can more efficiently prevent the penetration of liquid water, effectively improve the waterproof performance of nanofiber film on the basis of ensuring high moisture permeability, and has great application prospect in protective clothing fields such as storm clothing, ski suit, field military uniform, etc.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrospinning functional materials, and in particular to a nano-fishing net structure waterproof and moisture permeable film and a preparation method and application thereof. BACKGROUND

[0002] In the field of modern high-performance protective clothing, waterproof and moisture permeable films play a dual role of waterproofing and moisture permeability as key materials. The design criteria focus on small pore size and high porosity to effectively prevent liquid water penetration while quickly removing body surface sweat moisture, ensuring the wearer remains dry and comfortable in humid environments. The electrospinning process is an effective method for preparing nanofiber films, which to some extent reduces the pore size of the fiber material, thereby improving the waterproof performance. However, the existing technology such as electrospun nano-spider web waterproof and moisture permeable film, spider web structure blended waterproof and moisture permeable film, waterproof and moisture permeable composite fabric containing fluorinated graphene, and thermal-wet comfort nanofiber waterproof and moisture permeable film, etc., have relatively large pore sizes, limiting their further improvement, making it difficult to further improve water pressure resistance, and severely limiting their application in high-end protective fields such as ski suits, outdoor jackets, field uniforms, and fire suits.

[0003] Therefore, it is necessary to provide a waterproof and moisture permeable film with high porosity, small pore size, and high waterproof and moisture permeable performance to solve the above problems. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a nano-fishing net structure waterproof and moisture permeable film with high porosity and smaller pore size, which can ensure the rapid transmission of water vapor and more efficiently prevent the penetration of liquid water, effectively improving the waterproof performance of the nanofiber film while ensuring high moisture permeability.

[0005] The present application also provides a preparation method of the above-mentioned nano-fishing net structure waterproof and moisture permeable film.

[0006] The present application also provides an application of the above-mentioned nano-fishing net structure waterproof and moisture permeable film.

[0007] The first aspect of the present application provides a nano-fishing net structure waterproof and moisture permeable film, which comprises a nanofiber base layer and a nano-fishing net layer attached to the nanofiber base layer; the nanofiber base layer is composed of a nanofiber film prepared from polymer A; the nano-fishing net layer is formed by phase separation of polymer C; the thickness of the nanofiber base layer is 30-100 μm.

[0008] The nano-fishing net structure waterproof and moisture permeable film according to the first aspect of the present application has at least the following beneficial effects:

[0009] The nano fishing net structure waterproof and moisture permeable film has a nano fiber base layer and a nano fishing net layer, has high porosity and small pore diameter, the high porosity can ensure the rapid conduction of water vapor, and the small pore diameter can more efficiently prevent the penetration of liquid water, and the comprehensive waterproof and moisture permeable performance is better than that of related products such as polyethylene non-woven fabric, polytetrafluoroethylene biaxially oriented film and polyurethane film in the market. 2 / d.

[0010] According to some embodiments of the present application, the polymer A includes at least one of alcohol-soluble polyamide, alcohol-soluble polyurethane, ethylene-vinyl acetate copolymer and ethylene-olefin copolymer.

[0011] According to some embodiments of the present application, the polymer C includes at least one of polyvinylidene fluoride, fluorinated polyurethane, fluorinated polyacrylic acid and polyvinyl butyral.

[0012] The second aspect of the present application provides a preparation method of the above-mentioned nano fishing net structure waterproof and moisture permeable film, and the preparation method comprises the following steps:

[0013] S1, using an electrospinning process to prepare the nano fiber film on a receiving substrate;

[0014] S2, immersing the nano fiber film of step S1 in a polymer C solution, placing it in ultrapure water, and forming the nano fishing net layer through non-solvent induced phase separation;

[0015] S3, performing heat treatment on the composite fiber film treated in step S2 to obtain the nano fishing net structure waterproof and moisture permeable film.

[0016] The nano fishing net structure waterproof and moisture permeable film according to the second aspect of the present application has at least the following beneficial effects:

[0017] In the preparation method of the present application, the nano fiber film is immersed in a polymer C solution for treatment, so that the surface of the nano fiber film is uniformly coated with a dilute solution of polymer C. The nano fiber film treated by the immersion process is placed in ultrapure water, the non-solvent induces the phase separation of polymer C to form a nano fishing net structure, reduces the pore diameter of the nano fiber film, and the composite fiber film is heat treated, the hydrophobic chain segment of polymer C is induced to migrate to the surface of the fiber at high temperature, so that the composite film shows a hydrophobic effect, and finally a nano fishing net structure waterproof and moisture permeable film is obtained.

[0018] The preparation method of the application constructs a nanofishnet structure on the surface of the nanofiber membrane based on a non-solvent induced phase separation process, and the small pore structure layer is formed by precipitating the polymer in the hydrophobic polymer dilute solution through ultrapure water, thereby effectively reducing the pore size of the nanofiber membrane, and the hydrophobic chain segment is induced to migrate at high temperature, thereby improving the waterproof performance of the composite membrane material under the premise of ensuring excellent moisture permeability of the composite membrane material.

[0019] According to some embodiments of the application, in step S1, electrospinning is performed on the solution.

[0020] According to some embodiments of the application, in step S1, the solvent for electrospinning is selected from at least one of ethanol, acetone, and dichloromethane.

[0021] According to some embodiments of the application, in step S1, the concentration of the solution for electrospinning satisfies that the mass fraction of polymer A is 1-10%.

[0022] According to some embodiments of the application, in step S1, the feeding speed of the spinning solution for electrospinning is 0.1-5 mL / h.

[0023] According to some embodiments of the application, in step S1, the receiving distance for electrospinning is 5-40 cm.

[0024] According to some embodiments of the application, in step S1, the voltage for electrospinning is 3-50 kV.

[0025] According to some embodiments of the application, in step S1, the receiving substrate includes at least one of melt-blown non-woven fabric, copper mesh, woven fabric, glassine release paper, and non-woven fabric.

[0026] According to some embodiments of the application, in step S2, the solvent for the polymer C solution is selected from at least one of N-N dimethylformamide, N-N dimethylacetamide, and acetic acid.

[0027] According to some embodiments of the application, in step S2, the mass fraction of the polymer C solution is 1-10%.

[0028] According to some embodiments of the application, in step S2, the time for the immersion treatment is 10-30 min.

[0029] According to some embodiments of the application, in step S2, the temperature for the immersion treatment is 10-60°C.

[0030] According to some embodiments of the application, in step S2, the immersion treatment further includes hanging at room temperature for 10-30 min.

[0031] According to some embodiments of the present application, the temperature of the ultrapure water in step S2 is 20-50 DEG C.

[0032] According to some embodiments of the present application, the time for treating in the ultrapure water in step S2 is 1-30 min.

[0033] According to some embodiments of the present application, the time for the heat treatment in step S3 is 10-60 min.

[0034] According to some embodiments of the present application, the temperature for the heat treatment in step S3 is 70-160 DEG C.

[0035] The third aspect of the present application provides the application of the above-mentioned nano-fishing net structure waterproof and moisture permeable film and the nano-fishing net structure waterproof and moisture permeable film prepared by the above-mentioned preparation method in the field of functional protective clothing.

[0036] According to the application of the carbon nanotube / nanofiber composite film according to the third aspect of the present application, at least the following beneficial effects are achieved:

[0037] The nano-fishing net structure waterproof and moisture permeable film of the present application has simple forming process and low cost, has high porosity and small pore size, the high porosity can ensure the rapid transmission of water vapor, and the small pore size can more efficiently prevent the penetration of liquid water, and the comprehensive waterproof and moisture permeable performance is better than that of related products such as polyethylene non-woven fabric, polytetrafluoroethylene biaxial stretching film and polyurethane film in the market. It is expected to be applied in high-end protection fields such as ski suits, outdoor clothes, field military uniforms and fire suits.

[0038] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood by those skilled in the art from the description, or will be understood by implementing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0040] Figure 1 is a schematic diagram of the nano-fishing net structure waterproof and moisture permeable film in the embodiments of the present application; wherein 1 is a nanofiber film base layer, and 2 is a nano-fishing net layer. DETAILED DESCRIPTION

[0041] The concept and technical effects of the present application will be described below in conjunction with embodiments, so as to fully understand the purposes, features and effects of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] The raw materials used in the embodiments of the present application are commercially available or available to those skilled in the art, and the methods used in the embodiments of the present application are methods mastered by those skilled in the art, unless otherwise specified.

[0043] It should be noted that, in order not to obscure the present application with unnecessary details, only structures and / or processing steps closely related to the technical solutions of the present application are shown in the drawings, and other details not closely related to the present application are omitted. In addition, it should be noted that the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device.

[0044] Example 1

[0045] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0046] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 16% by using ethanol as a solvent, and prepare a nanofiber film on a non-woven fabric by electrospinning, the spinning voltage is 20kV, the receiving distance is 25cm, the feeding speed of the spinning solution is 3mL / h, and the thickness of the obtained nanofiber film is 60μm.

[0047] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 5% by using N-N dimethylformamide as a solvent, and immerse the polyamide nanofiber film for 20min at 40℃, and then hang it at room temperature for 10min.

[0048] Third step: place the above-mentioned immersed composite film in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 25℃, and the treatment time is 10min.

[0049] Fourth step: heat treat the above-mentioned composite film for 30min at 100℃, and obtain a composite film with excellent waterproof and moisture permeable properties, the water pressure resistance is 160kPa, and the moisture permeability in a low humidity environment is 15500g / m 2 / d.

[0050] Example 2

[0051] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0052] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 18% using ethanol as the solvent, prepare a nanofiber membrane on a melt-blown nonwoven fabric by electrospinning, the spinning voltage is 20 kV, the receiving distance is 20 cm, the feeding speed of the spinning solution is 2 mL / h, and the thickness of the obtained nanofiber membrane is 50 μm.

[0053] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 6% using N-N dimethylacetamide as the solvent, and perform immersion treatment on the polyamide nanofiber membrane, the soaking time is 15 min, the soaking temperature is 35℃, and the membrane is vertically placed at room temperature for 15 min.

[0054] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 20℃, and the treatment time is 5 min.

[0055] Fourth step: perform heat treatment on the above-mentioned composite membrane, the heat treatment time is 20 min, and the heat treatment temperature is 80℃, thereby obtaining a composite membrane with excellent waterproof and moisture-permeable properties, the water pressure resistance is 130 kPa, and the moisture permeability in a low-humidity environment is 13500 g / m 2 / d.

[0056] Example 3

[0057] A method for preparing a nanofishing net structure waterproof and moisture-permeable membrane, the specific steps are as follows:

[0058] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 20% using acetone as the solvent, prepare a nanofiber membrane on a copper mesh by electrospinning, the spinning voltage is 30 kV, the receiving distance is 30 cm, the feeding speed of the spinning solution is 2.5 mL / h, and the thickness of the obtained nanofiber membrane is 55 μm.

[0059] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 8% using N-N dimethylacetamide as the solvent, and perform immersion treatment on the polyamide nanofiber membrane, the soaking time is 10 min, the soaking temperature is 20℃, and the membrane is vertically placed at room temperature for 20 min.

[0060] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 26℃, and the treatment time is 25 min.

[0061] Fourth step: perform heat treatment on the above-mentioned composite membrane, the heat treatment time is 30 min, and the heat treatment temperature is 75℃, thereby obtaining a composite membrane with excellent waterproof and moisture-permeable properties, the water pressure resistance is 150 kPa, and the moisture permeability in a low-humidity environment is 15500 g / m 2 / d.

[0062] Example 4

[0063] A preparation method of a waterproof and moisture-permeable film with nanofishing net structure, specific steps are as follows:

[0064] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 14% by using ethanol as a solvent, and prepare a nanofiber film on a copper mesh by an electrostatic spinning method, the spinning voltage is 30kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 2.5mL / h, and the thickness of the obtained nanofiber film is 55μm.

[0065] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 10% by using N-N dimethylacetamide as a solvent, and immerse the polyamide nanofiber film for treatment, the soaking time is 10min, the soaking temperature is 40℃, and the film is hung vertically for 15min at room temperature.

[0066] Third step: place the above-mentioned immersed composite film in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 26℃, and the treatment time is 25min.

[0067] Fourth step: perform heat treatment on the above-mentioned composite film, the heat treatment time is 35min, the heat treatment temperature is 100℃, and thus a composite film with excellent waterproof and moisture-permeable performance is obtained, the water pressure resistance is 165kPa, and the moisture permeability in a low-humidity environment is 16400g / m 2 / d.

[0068] Example 5

[0069] A preparation method of a waterproof and moisture-permeable film with nanofishing net structure, specific steps are as follows:

[0070] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 12% by using ethanol as a solvent, and prepare a nanofiber film on a woven fabric by an electrostatic spinning method, the spinning voltage is 28kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 3.5mL / h, and the thickness of the obtained nanofiber film is 75μm.

[0071] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 5% by using N-N dimethylacetamide as a solvent, and immerse the polyamide nanofiber film for treatment, the soaking time is 15min, the soaking temperature is 30℃, and the film is hung vertically for 30min at room temperature.

[0072] Third step: place the above-mentioned immersed composite film in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 25℃, and the treatment time is 15min.

[0073] Fourth step: perform heat treatment on the above-mentioned composite film, the heat treatment time is 15min, the heat treatment temperature is 90℃, and thus a composite film with excellent waterproof and moisture-permeable performance is obtained, the water pressure resistance is 140kPa, and the moisture permeability in a low-humidity environment is 14400g / m 2 / d.

[0074] Example 6

[0075] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0076] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 16% by using acetone as a solvent, and prepare a nanofiber film on a non-woven fabric by electrospinning, the spinning voltage is 35kV, the receiving distance is 20cm, the liquid supply speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 70μm.

[0077] Second step: prepare a fluorinated polyacrylic acid solution with a mass fraction of 8% by using N-N dimethylacetamide as a solvent, and immerse the polyamide nanofiber film for treatment, the soaking time is 10min, the soaking temperature is 20℃, and the film is hung vertically at room temperature for 20min.

[0078] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 30℃, and the treatment time is 5min.

[0079] Fourth step: heat treat the above-mentioned composite film, the heat treatment time is 20min, the heat treatment temperature is 75℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 155kPa, and the moisture permeability in a low humidity environment is 15600g / m 2 / d.

[0080] Example 7

[0081] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0082] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 10% by using ethanol as a solvent, and prepare a nanofiber film on a non-woven fabric by electrospinning, the spinning voltage is 20kV, the receiving distance is 15cm, the liquid supply speed of the spinning solution is 2mL / h, and the thickness of the obtained nanofiber film is 45μm.

[0083] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 6% by using N-N dimethylformamide as a solvent, and immerse the polyamide nanofiber film for treatment, the soaking time is 15min, the soaking temperature is 40℃, and the film is hung vertically at room temperature for 10min.

[0084] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the polyvinylidene fluoride, the temperature of the ultrapure water is set to 20℃, and the treatment time is 10min.

[0085] Fourth step: heat treatment of the above composite film, heat treatment time is 10 min, heat treatment temperature is 90℃, and the composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 145kPa, and the low humidity environment moisture permeability is 14800g / m 2 / d.

[0086] Example 8

[0087] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0088] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 16% by using ethanol as a solvent, and prepare a nanofiber film on a non-woven fabric by electrospinning method, the spinning voltage is 30kV, the receiving distance is 15cm, the feeding speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 80μm.

[0089] Second step: prepare a polyfluorinated polyacrylic acid solution with a mass fraction of 8% by using N-N dimethylacetamide as a solvent, and dip the polyurethane nanofiber film for treatment, the soaking time is 10min, the soaking temperature is 25℃, and the film is hung vertically for 15min at room temperature.

[0090] Third step: place the above dipped composite film in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 25℃, and the treatment time is 5min.

[0091] Fourth step: heat treatment of the above composite film, heat treatment time is 15min, heat treatment temperature is 85℃, and the composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 165kPa, and the low humidity environment moisture permeability is 16400g / m 2 / d.

[0092] Example 9

[0093] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0094] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 16% by using ethanol as a solvent, and prepare a nanofiber film on a non-woven fabric by electrospinning method, the spinning voltage is 30kV, the receiving distance is 15cm, the feeding speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 80μm.

[0095] Second step: prepare a polyfluorinated polyacrylic acid solution with a mass fraction of 8% by using N-N dimethylacetamide as a solvent, and dip the polyurethane nanofiber film for treatment, the soaking time is 10min, the soaking temperature is 25℃, and the film is hung vertically for 15min at room temperature.

[0096] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of fluorinated polyacrylic acid, the temperature of ultrapure water is set to 35℃, and the treatment time is 10 min.

[0097] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 20 min, and the heat treatment temperature is 100℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 160kPa, and the low humidity environment moisture permeability is 15900g / m 2 / d.

[0098] Example 10

[0099] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0100] Step 1: An alcohol-soluble polyamide solution with a mass fraction of 20% is prepared with ethanol as the solvent, and a nanofiber film is prepared on a glassine release paper by electrospinning, the spinning voltage is 30kV, the receiving distance is 25cm, the feeding speed of the spinning solution is 1mL / h, and the thickness of the obtained nanofiber film is 60μm.

[0101] Step 2: A polyvinylidene fluoride solution with a mass fraction of 4% is prepared with N-N dimethylacetamide as the solvent, and the polyamide nanofiber film is immersed for 20min at 20℃, and then is hung vertically at room temperature for 15min.

[0102] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of polyvinylidene fluoride, the temperature of ultrapure water is set to 20℃, and the treatment time is 5min.

[0103] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 40min, and the heat treatment temperature is 95℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 135kPa, and the low humidity environment moisture permeability is 13400g / m 2 / d.

[0104] Example 11

[0105] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0106] Step 1: An alcohol-soluble polyamide solution with a mass fraction of 15% is prepared with ethanol as the solvent, and a nanofiber film is prepared on a woven fabric by electrospinning, the spinning voltage is 40kV, the receiving distance is 15cm, the feeding speed of the spinning solution is 3mL / h, and the thickness of the obtained nanofiber film is 85μm.

[0107] Second step: prepare a polyvinyl butyral solution with a mass fraction of 7% using acetic acid as the solvent, and immerse the polyamide nanofiber membrane in the solution for 10 min at 30°C, and then let it stand for 20 min at room temperature.

[0108] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the polyvinyl butyral, and set the temperature of the ultrapure water to 30°C, and treat for 25 min.

[0109] Fourth step: heat treat the above-mentioned composite membrane for 35 min at 75°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 144 kPa and a low-humidity environment moisture permeability of 14400 g / m 2 / d.

[0110] Example 12

[0111] A method for preparing a nanometer fishing net structure waterproof and moisture-permeable membrane, comprising the following specific steps:

[0112] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 18% using dichloromethane as the solvent, and prepare a nanofiber membrane on a non-woven fabric by electrospinning, with a spinning voltage of 35 kV, a receiving distance of 20 cm, and a solution supply speed of 3 mL / h, to obtain a nanofiber membrane with a thickness of 85 μm.

[0113] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 9% using N-N dimethylformamide as the solvent, and immerse the polyamide nanofiber membrane in the solution for 15 min at 40°C, and then let it stand for 15 min at room temperature.

[0114] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the polyvinylidene fluoride, and set the temperature of the ultrapure water to 40°C, and treat for 10 min.

[0115] Fourth step: heat treat the above-mentioned composite membrane for 40 min at 80°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 153 kPa and a low-humidity environment moisture permeability of 15200 g / m 2 / d.

[0116] Example 13

[0117] A method for preparing a nanometer fishing net structure waterproof and moisture-permeable membrane, comprising the following specific steps:

[0118] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 14% using dichloromethane as the solvent, and prepare a nanofiber membrane on a copper mesh through electrospinning, with a spinning voltage of 30 kV, a receiving distance of 10 cm, and a spinning solution supply speed of 3.5 mL / h, and the thickness of the obtained nanofiber membrane is 65 μm.

[0119] Second step: prepare a polyvinyl butyral solution with a mass fraction of 10% using N-N dimethylformamide as the solvent, and immerse the polyamide nanofiber membrane for 25 min at a soaking temperature of 50°C, and then hang it at room temperature for 10 min.

[0120] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the polyvinyl butyral, with the ultrapure water temperature set to 20°C, and the treatment time is 15 min.

[0121] Fourth step: heat treat the above-mentioned composite membrane for 30 min at a heat treatment temperature of 110°C, and obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 142 kPa and a low-humidity environment moisture permeability of 14100 g / m 2 / d.

[0122] Example 14

[0123] A method for preparing a nanofishing net structure waterproof and moisture-permeable membrane, and the specific steps are as follows:

[0124] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 25% using dichloromethane as the solvent, and prepare a nanofiber membrane on a copper mesh through electrospinning, with a spinning voltage of 15 kV, a receiving distance of 35 cm, and a spinning solution supply speed of 3 mL / h, and the thickness of the obtained nanofiber membrane is 80 μm.

[0125] Second step: prepare a fluorinated polyacrylic acid solution with a mass fraction of 5% using acetic acid as the solvent, and immerse the polyamide nanofiber membrane for 15 min at a soaking temperature of 45°C, and then hang it at room temperature for 15 min.

[0126] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, with the ultrapure water temperature set to 30°C, and the treatment time is 10 min.

[0127] Fourth step: heat treat the above-mentioned composite membrane for 35 min at a heat treatment temperature of 120°C, and obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 153 kPa and a low-humidity environment moisture permeability of 15100 g / m 2 / d.

[0128] Example 15

[0129] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0130] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 16% by using ethanol as a solvent, and prepare a nanofiber film on a copper mesh by electrospinning, the spinning voltage is 20kV, the receiving distance is 20cm, the feeding speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 60μm.

[0131] Second step: prepare a fluorinated polyurethane solution with a mass fraction of 5% by using N-N dimethylacetamide as a solvent, and immerse the polyamide nanofiber film for treatment, the soaking time is 20min, the soaking temperature is 40℃, and the film is hung vertically for 10min at room temperature.

[0132] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the fluorinated polyurethane, the temperature of the ultrapure water is set to 20℃, and the treatment time is 10min.

[0133] Fourth step: heat treat the above-mentioned composite film, the heat treatment time is 30min, the heat treatment temperature is 90℃, and thus an excellent waterproof and moisture permeable composite film is obtained, the water pressure resistance is 150kPa, and the moisture permeability in a low humidity environment is 15500g / m 2 / d.

[0134] Example 16

[0135] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0136] First step: prepare an alcohol-soluble polyamide solution with a mass fraction of 20% by using dichloromethane as a solvent, and prepare a nanofiber film on a Gracing release paper by electrospinning, the spinning voltage is 35kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 4mL / h, and the thickness of the obtained nanofiber film is 90μm.

[0137] Second step: prepare a fluorinated polyurethane solution with a mass fraction of 8% by using N-N dimethylacetamide as a solvent, and immerse the polyamide nanofiber film for treatment, the soaking time is 15min, the soaking temperature is 30℃, and the film is hung vertically for 15min at room temperature.

[0138] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the fluorinated polyurethane, the temperature of the ultrapure water is set to 30℃, and the treatment time is 20min.

[0139] Fourth step: heat treat the above-mentioned composite film, the heat treatment time is 25min, the heat treatment temperature is 80℃, and thus an excellent waterproof and moisture permeable composite film is obtained, the water pressure resistance is 140kPa, and the moisture permeability in a low humidity environment is 14100g / m 2 / d.

[0140] Example 17

[0141] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0142] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 15% using dichloromethane as a solvent, and prepare a nanofiber film on a glassine release paper by electrospinning, the spinning voltage is 15 kV, the receiving distance is 15 cm, the feeding speed of the spinning solution is 2 mL / h, and the thickness of the obtained nanofiber film is 50 μm.

[0143] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 10% using N-N dimethylformamide as a solvent, and immerse the polyurethane nanofiber film for 25 min at 25°C, and then hang it at room temperature for 20 min.

[0144] Third step: place the above-mentioned immersed composite film in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 40°C, and the treatment time is 10 min.

[0145] Fourth step: heat treat the above-mentioned composite film for 15 min at 105°C, and obtain a composite film with excellent waterproof and moisture permeable properties, the water pressure resistance is 135 kPa, and the moisture permeability in a low-humidity environment is 13600 g / m 2 / d.

[0146] Example 18

[0147] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0148] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 18% using dichloromethane as a solvent, and prepare a nanofiber film on a melt-blown non-woven fabric by electrospinning, the spinning voltage is 10 kV, the receiving distance is 25 cm, the feeding speed of the spinning solution is 1.5 mL / h, and the thickness of the obtained nanofiber film is 45 μm.

[0149] Second step: prepare a fluorinated polyacrylic acid solution with a mass fraction of 10% using N-N dimethylformamide as a solvent, and immerse the polyurethane nanofiber film for 25 min at 25°C, and then hang it at room temperature for 20 min.

[0150] Third step: place the above-mentioned immersed composite film in ultrapure water to induce fluorinated polyacrylic acid phase separation, the temperature of the ultrapure water is set to 20°C, and the treatment time is 30 min.

[0151] Fourth step: heat treatment of the above composite film, heat treatment time is 20 min, heat treatment temperature is 75℃, and a composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 125kPa, and the moisture permeability in a low humidity environment is 12600g / m 2 / d.

[0152] Example 19

[0153] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0154] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 10% by using dichloromethane as a solvent, and prepare a nanofiber film on a melt-blown non-woven fabric by electrospinning, the spinning voltage is 15kV, the receiving distance is 35cm, the liquid supply speed of the spinning solution is 4mL / h, and the thickness of the obtained nanofiber film is 55μm.

[0155] Second step: prepare a polyvinyl butyral solution with a mass fraction of 6% by using N-N dimethylformamide as a solvent, and dip the polyurethane nanofiber film for immersion treatment, the immersion time is 15min, the immersion temperature is 26℃, and the film is hung vertically for 10min at room temperature.

[0156] Third step: place the above-mentioned dipped composite film in ultrapure water to induce phase separation of polyvinyl butyral, the temperature of the ultrapure water is set to 25℃, and the treatment time is 20min.

[0157] Fourth step: heat treatment of the above composite film, heat treatment time is 30 min, heat treatment temperature is 85℃, and a composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 130kPa, and the moisture permeability in a low humidity environment is 12900g / m 2 / d.

[0158] Example 20

[0159] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0160] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 25% by using ethanol as a solvent, and prepare a nanofiber film on a woven fabric by electrospinning, the spinning voltage is 35kV, the receiving distance is 25cm, the liquid supply speed of the spinning solution is 3.5mL / h, and the thickness of the obtained nanofiber film is 60μm.

[0161] Second step: prepare a fluorinated polyurethane solution with a mass fraction of 5% by using N-N dimethylformamide as a solvent, and dip the polyurethane nanofiber film for immersion treatment, the immersion time is 30min, the immersion temperature is 35℃, and the film is hung vertically for 15min at room temperature.

[0162] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of fluorinated polyurethane, the temperature of ultrapure water is set to 35℃, and the treatment time is 10 min.

[0163] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 10 min, and the heat treatment temperature is 100℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 126 kPa, and the low humidity environment moisture permeability is 12700 g / m 2 / d.

[0164] Example 21

[0165] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0166] Step 1: An alcohol-soluble polyurethane solution with a mass fraction of 12% is prepared with ethanol as the solvent, and a nanofiber film is prepared on a glassine release paper by electrospinning, the spinning voltage is 35 kV, the receiving distance is 15 cm, the feeding speed of the spinning solution is 2.5 mL / h, and the thickness of the obtained nanofiber film is 70 μm.

[0167] Step 2: A fluorinated polyacrylic acid solution with a mass fraction of 8% is prepared with N-N dimethylformamide as the solvent, and the polyurethane nanofiber film is immersed for 20 min at 40℃, and then is hung vertically at room temperature for 20 min.

[0168] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of fluorinated polyacrylic acid, the temperature of ultrapure water is set to 25℃, and the treatment time is 15 min.

[0169] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 30 min, and the heat treatment temperature is 120℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 130 kPa, and the low humidity environment moisture permeability is 13600 g / m 2 / d.

[0170] Example 22

[0171] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0172] Step 1: An alcohol-soluble polyurethane solution with a mass fraction of 22% is prepared with ethanol as the solvent, and a nanofiber film is prepared on a glassine release paper by electrospinning, the spinning voltage is 45 kV, the receiving distance is 20 cm, the feeding speed of the spinning solution is 5 mL / h, and the thickness of the obtained nanofiber film is 70 μm.

[0173] Second step: 10% fluorinated polyurethane solution was prepared by using N-N dimethylformamide as solvent, and the polyurethane nanofiber membrane was immersed for 10 min at 35℃, and then was vertically placed for 10 min at room temperature.

[0174] Third step: the above immersed composite membrane was placed in ultrapure water to induce fluorinated polyurethane phase separation, the temperature of ultrapure water was set to 35℃, and the treatment time was 25 min.

[0175] Fourth step: the above composite membrane was heat treated for 20 min at 95℃, and a composite membrane with excellent waterproof and moisture permeable performance was obtained, with a water pressure resistance of 140 kPa and a low humidity environment moisture permeability of 14600 g / m 2 / d.

[0176] Example 23

[0177] A preparation method of a nanometer fishing net structure waterproof and moisture permeable membrane, the specific steps are:

[0178] First step: 17% alcohol-soluble polyurethane solution was prepared by using ethanol as solvent, and a nanofiber membrane was prepared on a glassine release paper by electrospinning method, with a spinning voltage of 25 kV, a receiving distance of 25 cm, a solution supply speed of 2.5 mL / h, and the obtained nanofiber membrane had a thickness of 80 μm.

[0179] Second step: 4% fluorinated polyurethane solution was prepared by using N-N dimethylformamide as solvent, and the polyurethane nanofiber membrane was immersed for 15 min at 25℃, and then was vertically placed for 15 min at room temperature.

[0180] Third step: the above immersed composite membrane was placed in ultrapure water to induce fluorinated polyurethane phase separation, the temperature of ultrapure water was set to 25℃, and the treatment time was 10 min.

[0181] Fourth step: the above composite membrane was heat treated for 25 min at 75℃, and a composite membrane with excellent waterproof and moisture permeable performance was obtained, with a water pressure resistance of 132 kPa and a low humidity environment moisture permeability of 13200 g / m 2 / d.

[0182] Example 24

[0183] A preparation method of a nanometer fishing net structure waterproof and moisture permeable membrane, the specific steps are:

[0184] First step: prepare a 17% mass fraction alcohol-soluble polyurethane solution with acetone as solvent, prepare a nanofiber membrane on a glassine release paper by electrospinning method, the spinning voltage is 30kV, the receiving distance is 20cm, the feeding speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber membrane is 90μm.

[0185] Second step: prepare a 5% mass fraction polyvinyl butyral solution with N-N dimethylacetamide as solvent, and immerse the polyurethane nanofiber membrane for 25min at 45℃, and then hang it at room temperature for 20min.

[0186] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinyl butyral phase separation, the temperature of the ultrapure water is set to 30℃, and the treatment time is 5min.

[0187] Fourth step: heat treat the above-mentioned composite membrane for 10min at 100℃, and obtain a composite membrane with excellent waterproof and moisture permeable performance, the water pressure resistance is 146kPa, and the low-humidity environment moisture permeability is 14600g / m 2 / d.

[0188] Example 25

[0189] A method for preparing a nanofishing net structure waterproof and moisture permeable membrane, the specific steps are as follows:

[0190] First step: prepare a 15% mass fraction alcohol-soluble polyurethane solution with dichloromethane as solvent, prepare a nanofiber membrane on a copper mesh by electrospinning method, the spinning voltage is 15kV, the receiving distance is 15cm, the feeding speed of the spinning solution is 2.5mL / h, and the thickness of the obtained nanofiber membrane is 75μm.

[0191] Second step: prepare a 8% mass fraction polyvinyl butyral solution with N-N dimethylacetamide as solvent, and immerse the polyurethane nanofiber membrane for 30min at 55℃, and then hang it at room temperature for 10min.

[0192] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinyl butyral phase separation, the temperature of the ultrapure water is set to 40℃, and the treatment time is 10min.

[0193] Fourth step: heat treat the above-mentioned composite membrane for 20min at 90℃, and obtain a composite membrane with excellent waterproof and moisture permeable performance, the water pressure resistance is 140kPa, and the low-humidity environment moisture permeability is 14500g / m 2 / d.

[0194] Example 26

[0195] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0196] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 16% using dichloromethane as a solvent, and prepare a nanofiber film on a copper mesh by electrospinning, the spinning voltage is 15kV, the receiving distance is 25cm, the liquid supply speed of the spinning solution is 3mL / h, and the thickness of the obtained nanofiber film is 80μm.

[0197] Second step: prepare a fluorinated polyacrylic acid solution with a mass fraction of 8% using N-N dimethylformamide as a solvent, and immerse the polyurethane nanofiber film for treatment, the soaking time is 20min, the soaking temperature is 50℃, and the film is hung vertically at room temperature for 15min.

[0198] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 40℃, and the treatment time is 15min.

[0199] Fourth step: heat treat the above-mentioned composite film, the heat treatment time is 15min, the heat treatment temperature is 115℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 145kPa, and the low-humidity environment moisture permeability is 14900g / m 2 / d.

[0200] Example 27

[0201] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0202] First step: prepare an alcohol-soluble polyurethane solution with a mass fraction of 20% using dichloromethane as a solvent, and prepare a nanofiber film on a copper mesh by electrospinning, the spinning voltage is 15kV, the receiving distance is 25cm, the liquid supply speed of the spinning solution is 3mL / h, and the thickness of the obtained nanofiber film is 80μm.

[0203] Second step: prepare a fluorinated polyacrylic acid solution with a mass fraction of 6% using N-N dimethylformamide as a solvent, and immerse the polyurethane nanofiber film for treatment, the soaking time is 20min, the soaking temperature is 50℃, and the film is hung vertically at room temperature for 15min.

[0204] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 40℃, and the treatment time is 15min.

[0205] Fourth step: heat treat the above-mentioned composite film, the heat treatment time is 15min, the heat treatment temperature is 115℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 145kPa, and the low-humidity environment moisture permeability is 14900g / m 2 / d.

[0206] Example 28

[0207] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0208] First step: prepare a polyurethane solution with a mass fraction of 16% by using dichloromethane as a solvent, and prepare a nanofiber film on a copper mesh by electrospinning, the spinning voltage is 20kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 2mL / h, and the thickness of the obtained nanofiber film is 90μm.

[0209] Second step: prepare a polyvinyl butyral solution with a mass fraction of 6% by using N-N dimethylformamide as a solvent, and immerse the polyurethane nanofiber film for 15min at 40℃, and then hang it at room temperature for 20min.

[0210] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the polyvinyl butyral, the temperature of the ultrapure water is set to 35℃, and the treatment time is 25min.

[0211] Fourth step: heat treat the above-mentioned composite film for 20min at 105℃, and obtain a composite film with excellent waterproof and moisture permeable performance, the water pressure resistance is 150kPa, and the moisture permeability in a low humidity environment is 15800g / m 2 / d.

[0212] Example 29

[0213] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0214] First step: prepare a polyurethane solution with a mass fraction of 16% by using dichloromethane as a solvent, and prepare a nanofiber film on a copper mesh by electrospinning, the spinning voltage is 20kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 2mL / h, and the thickness of the obtained nanofiber film is 90μm.

[0215] Second step: prepare a polyvinyl butyral solution with a mass fraction of 6% by using N-N dimethylformamide as a solvent, and immerse the polyurethane nanofiber film for 15min at 40℃, and then hang it at room temperature for 20min.

[0216] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of the polyvinyl butyral, the temperature of the ultrapure water is set to 35℃, and the treatment time is 25min.

[0217] Fourth step: heat treatment of the above composite film, heat treatment time is 15 min, heat treatment temperature is 75℃, and a composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 130 kPa, and the moisture permeability in a low humidity environment is 13800 g / m 2 / d.

[0218] Example 30

[0219] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0220] First step: prepare a 20% ethylene-vinyl acetate copolymer solution with dichloromethane as a solvent, and prepare a nanofiber film on a melt-blown non-woven fabric by electrospinning, the spinning voltage is 25 kV, the receiving distance is 25 cm, the liquid supply speed of the spinning solution is 2.5 mL / h, and the thickness of the obtained nanofiber film is 85 μm.

[0221] Second step: prepare a 8% polyvinylidene fluoride solution with N-N dimethylacetamide as a solvent, and dip the ethylene-vinyl acetate copolymer nanofiber film for 20 min at 35℃, and then hang it at room temperature for 20 min.

[0222] Third step: place the above dipped composite film in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 35℃, and the treatment time is 20 min.

[0223] Fourth step: heat treatment of the above composite film, heat treatment time is 20 min, heat treatment temperature is 80℃, and a composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 135 kPa, and the moisture permeability in a low humidity environment is 13900 g / m 2 / d.

[0224] Example 31

[0225] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0226] First step: prepare a 15% ethylene-vinyl acetate copolymer solution with dichloromethane as a solvent, and prepare a nanofiber film on a woven fabric by electrospinning, the spinning voltage is 20 kV, the receiving distance is 15 cm, the liquid supply speed of the spinning solution is 1.5 mL / h, and the thickness of the obtained nanofiber film is 60 μm.

[0227] Second step: prepare a 6% fluorinated polyurethane solution with N-N dimethylacetamide as a solvent, and dip the ethylene-vinyl acetate copolymer nanofiber film for 15 min at 30℃, and then hang it at room temperature for 15 min.

[0228] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of fluorinated polyurethane, the temperature of ultrapure water is set to 40℃, and the treatment time is 15 min.

[0229] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 30 min, and the heat treatment temperature is 100℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 140 kPa, and the low humidity environment moisture permeability is 14500 g / m 2 / d.

[0230] Example 32

[0231] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0232] Step 1: An ethylene-vinyl acetate copolymer solution with a mass fraction of 10% is prepared with ethanol as the solvent, and a nanofiber film is prepared on a glassine release paper by electrospinning, the spinning voltage is 25 kV, the receiving distance is 25 cm, the feeding speed of the spinning solution is 3 mL / h, and the thickness of the obtained nanofiber film is 85 μm.

[0233] Step 2: A fluorinated polyurethane solution with a mass fraction of 10% is prepared with N-N dimethylacetamide as the solvent, and the ethylene-vinyl acetate copolymer nanofiber film is immersed for 25 min at 40℃, and then is hung vertically at room temperature for 25 min.

[0234] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of fluorinated polyurethane, the temperature of ultrapure water is set to 20℃, and the treatment time is 25 min.

[0235] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 20 min, and the heat treatment temperature is 85℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 135 kPa, and the low humidity environment moisture permeability is 13600 g / m 2 / d.

[0236] Example 33

[0237] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0238] Step 1: An ethylene-vinyl acetate copolymer solution with a mass fraction of 12% is prepared with acetone as the solvent, and a nanofiber film is prepared on a glassine release paper by electrospinning, the spinning voltage is 20 kV, the receiving distance is 20 cm, the feeding speed of the spinning solution is 2.5 mL / h, and the thickness of the obtained nanofiber film is 75 μm.

[0239] Second step: prepare a fluorinated polyurethane solution with a mass fraction of 8% using N-N dimethylformamide as the solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber membrane in the solution for 15 min at 35°C, and then let it stand at room temperature for 15 min.

[0240] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the fluorinated polyurethane, set the temperature of the ultrapure water to 45°C, and treat for 25 min.

[0241] Fourth step: heat treat the above-mentioned composite membrane for 15 min at 95°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 147 kPa and a low-humidity environment moisture permeability of 14900 g / m 2 / d.

[0242] Example 34

[0243] A method for preparing a nanometer fishing net structure waterproof and moisture-permeable membrane, the specific steps being:

[0244] First step: prepare an ethylene-vinyl acetate copolymer solution with a mass fraction of 10% using acetone as the solvent, and prepare a nanofiber membrane on a glassine release paper by electrospinning, with a spinning voltage of 25 kV, a receiving distance of 15 cm, and a spinning solution supply speed of 1.5 mL / h, to obtain a nanofiber membrane with a thickness of 80 μm.

[0245] Second step: prepare a fluorinated polyurethane solution with a mass fraction of 6% using N-N dimethylformamide as the solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber membrane in the solution for 15 min at 35°C, and then let it stand at room temperature for 15 min.

[0246] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the fluorinated polyurethane, set the temperature of the ultrapure water to 40°C, and treat for 15 min.

[0247] Fourth step: heat treat the above-mentioned composite membrane for 20 min at 80°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 134 kPa and a low-humidity environment moisture permeability of 13500 g / m 2 / d.

[0248] Example 35

[0249] A method for preparing a nanometer fishing net structure waterproof and moisture-permeable membrane, the specific steps being:

[0250] First step: ethylene-vinyl acetate copolymer solution with mass fraction of 12% was prepared with acetone as solvent, and nanofiber membrane was prepared on non-woven fabric by electrospinning method, the spinning voltage was 15kV, the receiving distance was 20cm, the feeding speed of spinning solution was 2mL / h, and the thickness of the obtained nanofiber membrane was 60μm.

[0251] Second step: fluorinated polyurethane solution with mass fraction of 6% was prepared with N-N dimethylacetamide as solvent, and the ethylene-vinyl acetate copolymer nanofiber membrane was immersed for 20min at 25℃, and then was hung for 10min at room temperature.

[0252] Third step: the above-mentioned composite membrane was placed in ultrapure water to induce phase separation of fluorinated polyurethane, the temperature of ultrapure water was set to 30℃, and the treatment time was 10min.

[0253] Fourth step: the above-mentioned composite membrane was heat treated for 15min at 85℃, and a composite membrane with excellent waterproof and moisture permeable performance was obtained, the water pressure resistance was 140kPa, and the moisture permeability in low humidity environment was 14300g / m 2 / d.

[0254] Example 36

[0255] A method for preparing a nanofishing net structure waterproof and moisture permeable membrane, the specific steps are as follows:

[0256] First step: ethylene-vinyl acetate copolymer solution with mass fraction of 14% was prepared with acetone as solvent, and nanofiber membrane was prepared on non-woven fabric by electrospinning method, the spinning voltage was 20kV, the receiving distance was 25cm, the feeding speed of spinning solution was 0.8mL / h, and the thickness of the obtained nanofiber membrane was 55μm.

[0257] Second step: fluorinated polyurethane solution with mass fraction of 8% was prepared with acetic acid as solvent, and the ethylene-vinyl acetate copolymer nanofiber membrane was immersed for 30min at 20℃, and then was hung for 15min at room temperature.

[0258] Third step: the above-mentioned composite membrane was placed in ultrapure water to induce phase separation of fluorinated polyurethane, the temperature of ultrapure water was set to 35℃, and the treatment time was 15min.

[0259] Fourth step: the above-mentioned composite membrane was heat treated for 20min at 100℃, and a composite membrane with excellent waterproof and moisture permeable performance was obtained, the water pressure resistance was 160kPa, and the moisture permeability in low humidity environment was 16300g / m 2 / d.

[0260] Example 37

[0261] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0262] First step: prepare a 16% ethylene-vinyl acetate copolymer solution with acetone as the solvent, and prepare a nanofiber film on non-woven fabric by electrospinning method, the spinning voltage is 25kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 75μm.

[0263] Second step: prepare a 7% fluorinated polyacrylic acid solution with acetic acid as the solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber film for 15min at 60℃, and then let it stand at room temperature for 20min.

[0264] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 40℃, and the treatment time is 25min.

[0265] Fourth step: heat treat the above-mentioned composite film for 15min at 90℃, and obtain a composite film with excellent waterproof and moisture permeable properties, the water pressure resistance is 155kPa, and the moisture permeability in a low humidity environment is 15700g / m 2 / d.

[0266] Example 38

[0267] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0268] First step: prepare a 15% ethylene-vinyl acetate copolymer solution with dichloromethane as the solvent, and prepare a nanofiber film on woven fabric by electrospinning method, the spinning voltage is 20kV, the receiving distance is 25cm, the feeding speed of the spinning solution is 3mL / h, and the thickness of the obtained nanofiber film is 90μm.

[0269] Second step: prepare a 9% fluorinated polyacrylic acid solution with acetic acid as the solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber film for 20min at 50℃, and then let it stand at room temperature for 15min.

[0270] Third step: place the above-mentioned immersed composite film in ultrapure water to induce phase separation of fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 30℃, and the treatment time is 15min.

[0271] Fourth step: heat treat the above-mentioned composite film for 20min at 105℃, and obtain a composite film with excellent waterproof and moisture permeable properties, the water pressure resistance is 158kPa, and the moisture permeability in a low humidity environment is 15800g / m2 / d.

[0272] Example 39

[0273] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0274] First step: prepare a 20% ethylene-vinyl acetate copolymer solution by dichloromethane as solvent, prepare a nanofiber membrane on woven fabric by electrospinning method, the spinning voltage is 40kV, the receiving distance is 30cm, the liquid supply speed of the spinning solution is 3mL / h, and the thickness of the obtained nanofiber membrane is 90μm.

[0275] Second step: prepare a 9% fluorinated polyacrylic acid solution by acetic acid as solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber membrane, the soaking time is 15min, the soaking temperature is 45℃, and the composite membrane is hung vertically at room temperature for 20min.

[0276] Third step: place the above immersed composite membrane in ultrapure water to induce phase separation of fluorinated polyacrylic acid, the temperature of ultrapure water is set to 25℃, and the treatment time is 25min.

[0277] Fourth step: heat the above composite membrane, the heat treatment time is 15min, the heat treatment temperature is 90℃, and the composite membrane with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 138kPa, and the moisture permeability in low humidity environment is 13400g / m 2 / d.

[0278] Example 40

[0279] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0280] First step: prepare a 22% ethylene-vinyl acetate copolymer solution by dichloromethane as solvent, prepare a nanofiber membrane on woven fabric by electrospinning method, the spinning voltage is 45kV, the receiving distance is 35cm, the liquid supply speed of the spinning solution is 4.5mL / h, and the thickness of the obtained nanofiber membrane is 95μm.

[0281] Second step: prepare a 10% polyvinyl butyral solution by acetic acid as solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber membrane, the soaking time is 25min, the soaking temperature is 40℃, and the composite membrane is hung vertically at room temperature for 15min.

[0282] Third step: place the above immersed composite membrane in ultrapure water to induce phase separation of polyvinyl butyral, the temperature of ultrapure water is set to 30℃, and the treatment time is 15min.

[0283] Fourth step: heat treatment of the above composite film, heat treatment time is 10 min, heat treatment temperature is 95℃, and a composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 140 kPa, and the low humidity environment moisture permeability is 14800 g / m 2 / d.

[0284] Example 41

[0285] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0286] First step: prepare a 17% ethylene-vinyl acetate copolymer solution with dichloromethane as the solvent, prepare a nanofiber film on a glassine release paper by electrospinning method, the spinning voltage is 30 kV, the receiving distance is 25 cm, the feeding speed of the spinning solution is 3.5 mL / h, and the thickness of the obtained nanofiber film is 80 μm.

[0287] Second step: prepare a 5% polyvinyl butyral solution with acetic acid as the solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber film, the soaking time is 15 min, the soaking temperature is 35℃, and the film is hung vertically at room temperature for 10 min.

[0288] Third step: place the above immersed composite film in ultrapure water to induce polyvinyl butyral phase separation, the ultrapure water temperature is set to 35℃, and the treatment time is 20 min.

[0289] Fourth step: heat treatment of the above composite film, heat treatment time is 10 min, heat treatment temperature is 95℃, and a composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 135 kPa, and the low humidity environment moisture permeability is 13900 g / m 2 / d.

[0290] Example 42

[0291] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0292] First step: prepare a 17% ethylene-vinyl acetate copolymer solution with dichloromethane as the solvent, prepare a nanofiber film on a glassine release paper by electrospinning method, the spinning voltage is 30 kV, the receiving distance is 25 cm, the feeding speed of the spinning solution is 3.5 mL / h, and the thickness of the obtained nanofiber film is 80 μm.

[0293] Second step: prepare a 5% polyvinyl butyral solution with acetic acid as the solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber film, the soaking time is 15 min, the soaking temperature is 35℃, and the film is hung vertically at room temperature for 10 min.

[0294] Step 3: The above immersed composite film is placed in ultrapure water to induce polyvinyl butyral phase separation, the temperature of ultrapure water is set to 25℃, and the treatment time is 15 min.

[0295] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 30 min, and the heat treatment temperature is 120℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 153 kPa, and the low-humidity environment moisture permeability is 15600 g / m 2 / d.

[0296] Example 43

[0297] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0298] Step 1: An ethylene-vinyl acid copolymer solution with a mass fraction of 16% is prepared with ethanol as a solvent, and a nanofiber film is prepared on a melt-blown non-woven fabric by electrospinning, the spinning voltage is 20 kV, the receiving distance is 30 cm, the liquid supply speed of the spinning solution is 2 mL / h, and the thickness of the obtained nanofiber film is 65 μm.

[0299] Step 2: A polyvinylidene fluoride solution with a mass fraction of 5% is prepared with N-N dimethylformamide as a solvent, and the ethylene-vinyl acid copolymer nanofiber film is subjected to immersion treatment, the soaking time is 15 min, the soaking temperature is 30℃, and the film is hung vertically at room temperature for 20 min.

[0300] Step 3: The above immersed composite film is placed in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of ultrapure water is set to 35℃, and the treatment time is 10 min.

[0301] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 10 min, and the heat treatment temperature is 90℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 160 kPa, and the low-humidity environment moisture permeability is 15500 g / m 2 / d.

[0302] Example 44

[0303] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0304] Step 1: An ethylene-vinyl acid copolymer solution with a mass fraction of 15% is prepared with ethanol as a solvent, and a nanofiber film is prepared on a copper mesh by electrospinning, the spinning voltage is 30 kV, the receiving distance is 20 cm, the liquid supply speed of the spinning solution is 1.5 mL / h, and the thickness of the obtained nanofiber film is 70 μm.

[0305] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 6% using N-N dimethylformamide as the solvent, and immerse the ethylene-glycol acid copolymer nanofiber membrane for 20 min at 35°C, and then let it stand for 25 min at room temperature.

[0306] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinylidene fluoride phase separation, set the ultrapure water temperature to 30°C, and treat for 15 min.

[0307] Fourth step: heat treat the above-mentioned composite membrane for 10 min at 90°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 155 kPa and a low-humidity environment moisture permeability of 15800 g / m 2 / d.

[0308] Example 45

[0309] A method for preparing a nanofishing net structure waterproof and moisture-permeable membrane, comprising the following specific steps:

[0310] First step: prepare an ethylene-glycol acid copolymer solution with a mass fraction of 20% using ethanol as the solvent, and prepare a nanofiber membrane on woven fabric by electrospinning, with a spinning voltage of 25 kV, a receiving distance of 25 cm, a spinning solution supply speed of 3.5 mL / h, and a thickness of the obtained nanofiber membrane of 80 μm.

[0311] Second step: prepare a polyvinylidene fluoride solution with a mass fraction of 8% using N-N dimethylformamide as the solvent, and immerse the ethylene-glycol acid copolymer nanofiber membrane for 20 min at 40°C, and then let it stand for 15 min at room temperature.

[0312] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinylidene fluoride phase separation, set the ultrapure water temperature to 40°C, and treat for 15 min.

[0313] Fourth step: heat treat the above-mentioned composite membrane for 10 min at 100°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 154 kPa and a low-humidity environment moisture permeability of 15500 g / m 2 / d.

[0314] Example 46

[0315] A method for preparing a nanofishing net structure waterproof and moisture-permeable membrane, comprising the following specific steps:

[0316] First step: prepare a 22% ethylene-glycol acid copolymer solution with ethanol as solvent, prepare nanofiber membrane on glassine release paper by electrospinning method, the spinning voltage is 20kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 4mL / h, and the thickness of the obtained nanofiber membrane is 90μm.

[0317] Second step: prepare a 10% polyvinylidene fluoride solution with N-N dimethylformamide as solvent, and immerse the ethylene-glycol acid copolymer nanofiber membrane, the soaking time is 10min, the soaking temperature is 45℃, and the membrane is hung at room temperature for 30min.

[0318] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce polyvinylidene fluoride phase separation, the temperature of the ultrapure water is set to 25℃, and the treatment time is 10min.

[0319] Fourth step: heat treat the above-mentioned composite membrane, the heat treatment time is 15min, the heat treatment temperature is 95℃, and the composite membrane with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 150kPa, and the moisture permeability in low humidity environment is 14900g / m 2 / d.

[0320] Example 47

[0321] A method for preparing a nanofishing net structure waterproof and moisture permeable membrane, the specific steps are as follows:

[0322] First step: prepare a 25% ethylene-glycol acid copolymer solution with ethanol as solvent, prepare nanofiber membrane on non-woven fabric by electrospinning method, the spinning voltage is 25kV, the receiving distance is 30cm, the feeding speed of the spinning solution is 2mL / h, and the thickness of the obtained nanofiber membrane is 100μm.

[0323] Second step: prepare a 10% fluorinated polyurethane solution with N-N dimethylformamide as solvent, and immerse the ethylene-glycol acid copolymer nanofiber membrane, the soaking time is 10min, the soaking temperature is 55℃, and the membrane is hung at room temperature for 10min.

[0324] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce fluorinated polyurethane phase separation, the temperature of the ultrapure water is set to 25℃, and the treatment time is 10min.

[0325] Fourth step: heat treat the above-mentioned composite membrane, the heat treatment time is 20min, the heat treatment temperature is 100℃, and the composite membrane with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 175kPa, and the moisture permeability in low humidity environment is 17200g / m 2 / d.

[0326] Example 48

[0327] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0328] First step: prepare a 16% ethylene-vinyl acid copolymer solution with acetone as solvent, prepare a nanofiber film on a melt-blown non-woven fabric by electrospinning method, the spinning voltage is 25kV, the receiving distance is 35cm, the liquid supply speed of the spinning solution is 2.5mL / h, and the thickness of the obtained nanofiber film is 80μm.

[0329] Second step: prepare a 10% fluorinated polyurethane solution with N-N dimethylacetamide as solvent, and immerse the ethylene-vinyl acid copolymer nanofiber film, the soaking time is 20min, the soaking temperature is 45℃, and the film is hung vertically at room temperature for 30min.

[0330] Third step: place the above immersed composite film in ultrapure water to induce phase separation of fluorinated polyurethane, the temperature of ultrapure water is set to 40℃, and the treatment time is 15min.

[0331] Fourth step: heat treat the above composite film, the heat treatment time is 20min, the heat treatment temperature is 100℃, and the composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 162kPa, and the moisture permeability in low humidity environment is 16700g / m 2 / d.

[0332] Example 49

[0333] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0334] First step: prepare a 15% ethylene-vinyl acid copolymer solution with acetone as solvent, prepare a nanofiber film on a melt-blown non-woven fabric by electrospinning method, the spinning voltage is 20kV, the receiving distance is 30cm, the liquid supply speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 75μm.

[0335] Second step: prepare a 5% fluorinated polyacrylic acid solution with N-N dimethylacetamide as solvent, and immerse the ethylene-vinyl acid copolymer nanofiber film, the soaking time is 15min, the soaking temperature is 20℃, and the film is hung vertically at room temperature for 20min.

[0336] Third step: place the above immersed composite film in ultrapure water to induce phase separation of fluorinated polyacrylic acid, the temperature of ultrapure water is set to 30℃, and the treatment time is 20min.

[0337] Fourth step: heat treatment of the above composite film, heat treatment time is 30 min, heat treatment temperature is 85℃, and the composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 158kPa, and the low humidity environment moisture permeability is 16400g / m 2 / d.

[0338] Example 50

[0339] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0340] First step: prepare a 20% ethylene-vinyl acid copolymer solution by using acetone as a solvent, and prepare a nanofiber film on a melt-blown non-woven fabric by using an electrostatic spinning method, the spinning voltage is 30kV, the receiving distance is 20cm, the liquid supply speed of the spinning solution is 2.5mL / h, and the thickness of the obtained nanofiber film is 62μm.

[0341] Second step: prepare a 8% fluorinated polyacrylic acid solution by using N-N dimethylacetamide as a solvent, and dip the ethylene-vinyl acid copolymer nanofiber film for 10min at 60℃, and then vertically place it at room temperature for 10min.

[0342] Third step: place the above dipped composite film in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 30℃, and the treatment time is 20min.

[0343] Fourth step: heat treatment of the above composite film, heat treatment time is 15min, heat treatment temperature is 80℃, and the composite film with excellent waterproof and moisture permeability is obtained, the water pressure resistance is 147kPa, and the low humidity environment moisture permeability is 15200g / m 2 / d.

[0344] Example 51

[0345] A preparation method of a nano-mesh structure waterproof and moisture permeable film, the specific steps are:

[0346] First step: prepare a 16% ethylene-vinyl acid copolymer solution by using acetone as a solvent, and prepare a nanofiber film on a melt-blown non-woven fabric by using an electrostatic spinning method, the spinning voltage is 15kV, the receiving distance is 20cm, the liquid supply speed of the spinning solution is 1.5mL / h, and the thickness of the obtained nanofiber film is 83μm.

[0347] Second step: prepare a 10% fluorinated polyacrylic acid solution by using N-N dimethylacetamide as a solvent, and dip the ethylene-vinyl acid copolymer nanofiber film for 25min at 45℃, and then vertically place it at room temperature for 15min.

[0348] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of the fluorinated polyacrylic acid, the temperature of the ultrapure water is set to 20℃, and the treatment time is 25 min.

[0349] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 40 min, and the heat treatment temperature is 140℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 170 kPa, and the low humidity environment moisture permeability is 16500 g / m 2 / d.

[0350] Example 52

[0351] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0352] Step 1: An ethylene-acid copolymer solution with a mass fraction of 15% is prepared with dichloromethane as the solvent, and a nanofiber film is prepared on a melt-blown non-woven fabric by electrospinning, the spinning voltage is 35 kV, the receiving distance is 20 m, the liquid supply speed of the spinning solution is 4.5 mL / h, and the thickness of the obtained nanofiber film is 95 μm.

[0353] Step 2: A polyvinyl butyral solution with a mass fraction of 6% is prepared with acetic acid as the solvent, and the ethylene-acid copolymer nanofiber film is immersed for 15 min at 25℃, and then is hung vertically at room temperature for 10 min.

[0354] Step 3: The above immersed composite film is placed in ultrapure water to induce phase separation of the polyvinyl butyral, the temperature of the ultrapure water is set to 30℃, and the treatment time is 25 min.

[0355] Step 4: The above composite film is subjected to heat treatment, the heat treatment time is 20 min, and the heat treatment temperature is 100℃, and a composite film with excellent waterproof and moisture permeable performance is obtained, the water pressure resistance is 153 kPa, and the low humidity environment moisture permeability is 15700 g / m 2 / d.

[0356] Example 53

[0357] A preparation method of a nano-fishing net structure waterproof and moisture permeable film, the specific steps are:

[0358] Step 1: An ethylene-acid copolymer solution with a mass fraction of 16% is prepared with dichloromethane as the solvent, and a nanofiber film is prepared on a melt-blown non-woven fabric by electrospinning, the spinning voltage is 15 kV, the receiving distance is 30 cm, the liquid supply speed of the spinning solution is 2 mL / h, and the thickness of the obtained nanofiber film is 75 μm.

[0359] Second step: prepare a polyvinyl butyral solution with a mass fraction of 8% using acetic acid as a solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber membrane for 20 minutes at 30°C. Let it stand for 15 minutes at room temperature.

[0360] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the polyvinyl butyral, and set the temperature of the ultrapure water to 40°C. The treatment time is 15 minutes.

[0361] Fourth step: heat treat the above-mentioned composite membrane for 20 minutes at 100°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 167 kPa and a low-humidity environment moisture permeability of 16900 g / m 2 / d.

[0362] Example 54

[0363] A method for preparing a nanofishing net structure waterproof and moisture-permeable membrane, the specific steps are as follows:

[0364] First step: prepare an ethylene-vinyl acetate copolymer solution with a mass fraction of 20% using dichloromethane as a solvent, and prepare a nanofiber membrane on a melt-blown non-woven fabric by electrospinning, with a spinning voltage of 30 kV, a receiving distance of 15 cm, and a spinning solution supply speed of 1.5 mL / h. The thickness of the obtained nanofiber membrane is 95 μm.

[0365] Second step: prepare a polyvinyl butyral solution with a mass fraction of 10% using acetic acid as a solvent, and immerse the ethylene-vinyl acetate copolymer nanofiber membrane for 30 minutes at 55°C. Let it stand for 20 minutes at room temperature.

[0366] Third step: place the above-mentioned immersed composite membrane in ultrapure water to induce phase separation of the polyvinyl butyral, and set the temperature of the ultrapure water to 20°C. The treatment time is 5 minutes.

[0367] Fourth step: heat treat the above-mentioned composite membrane for 60 minutes at 130°C to obtain a composite membrane with excellent waterproof and moisture-permeable properties, with a water pressure resistance of 175 kPa and a low-humidity environment moisture permeability of 17700 g / m 2 / d.

[0368] The above embodiments of the present application are described in detail, but the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A nano-fishing net structure waterproof and breathable membrane, characterized in that, The nanofiber waterproof and breathable membrane comprises a nanofiber substrate layer and a nanofiber mesh layer attached to the nanofiber substrate layer; the nanofiber substrate layer is composed of a nanofiber membrane prepared by polymer A; the nanofiber mesh layer is formed by phase separation of polymer C; the thickness of the nanofiber substrate layer is 30-100 μm. The polymer A comprises at least one of alcohol-soluble polyamide, alcohol-soluble polyurethane, ethylene-vinyl acetate copolymer, and ethylene-alkyd copolymer; the polymer C comprises at least one of polyvinylidene fluoride, fluorinated polyurethane, fluorinated polyacrylic acid, and polyvinyl butyral. The nano-fishing net structure waterproof and breathable membrane includes a nano-fishing net structure waterproof and breathable membrane prepared by the following method: S1. The nanofiber membrane is prepared on the receiving substrate using an electrospinning process; S2. The nanofiber membrane from step S1 is immersed in polymer C solution and placed in ultrapure water to form the nano-fishing net layer through non-solvent-induced phase separation. S3. The composite fiber membrane treated in step S2 is subjected to heat treatment to obtain the nano-fishing net structure waterproof and breathable membrane. In step S2, the immersion treatment time is 10-30 minutes; in step S2, the immersion treatment temperature is 10-60°C; in step S2, the immersion treatment also includes hanging at room temperature for 10-30 minutes. In step S3, the heat treatment time is 10 to 60 minutes; in step S3, the heat treatment temperature is 70 to 160°C.

2. The nano-fishing net structure waterproof and breathable membrane according to claim 1, characterized in that, In step S1, the electrospinning is solution electrospinning; The solvent for electrospinning is selected from at least one of ethanol, acetone, and dichloromethane; the concentration of the electrospinning solution satisfies the following condition: the mass fraction of polymer A is 1-10%.

3. The nano-fishing net structure waterproof and breathable membrane according to claim 1, characterized in that, In step S1, the electrospinning solution supply rate is 0.1-5 mL / h; in step S1, the receiving distance of the electrospinning is 5-40 cm; in step S1, the voltage of the electrospinning is 3-50 kV; in step S1, the receiving substrate includes at least one of meltblown nonwoven fabric, copper mesh, woven fabric, and glassine release paper.

4. The nano-fishing net structure waterproof and breathable membrane according to claim 1, characterized in that, In step S2, the solvent of the polymer C solution is selected from at least one of N,N-dimethylformamide, N,N-dimethylacetamide and acetic acid; in step S2, the mass fraction of the polymer C solution is 1-10%.

5. The nano-fishing net structure waterproof and breathable membrane according to claim 1, characterized in that, In step S2, the temperature of the ultrapure water is 20-50°C; in step S2, the treatment time in the ultrapure water is 1-30 minutes.

6. The application of a nano-fishing net structure waterproof and breathable membrane as described in any one of claims 1 to 5 in the field of functional protective clothing.

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