PTFE waterproof and breathable membrane for textile fabrics and preparation method thereof

Abstract

The present invention discloses a PTFE waterproof and breathable membrane for textile fabrics and a preparation method thereof, belonging to the technical field of special fabrics. Amphiphilic graphene oxide powder is ultrasonically dispersed with deionized water to obtain an amphiphilic graphene oxide dispersion with a mass fraction of 2%; a PTFE porous membrane is unfolded and the amphiphilic graphene oxide dispersion is sprayed on one side thereof at a spraying amount of 1-2 mL / cm 2 , vacuum drying to obtain a modified PTFE porous membrane; applying an amphiphilic coating on one side of the modified PTFE porous membrane on which the amphiphilic graphene oxide powder is deposited, and drying to obtain a PTFE waterproof and breathable membrane for textile fabrics containing an amphiphilic coating; the amphiphilic graphene oxide powder is deposited on the surface of the PTFE porous membrane, which helps to increase the lipophilicity and hydrophilicity of the surface, and helps to increase the water permeability and oil permeability; after being composited into a textile fabric, it helps to increase the discharge effect of sweat and grease on the textile fabric, meeting the use requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of special fabrics, and particularly relates to a PTFE waterproof and breathable membrane for textile fabrics and a preparation method thereof. Background Art

[0002] Special fabrics are used to ensure the safety of workers in special industries, including flame retardant fabrics, oil-proof fabrics, fire-proof fabrics, waterproof fabrics, anti-static fabrics, acid and alkali resistant fabrics, wrinkle-resistant and iron-free fabrics, self-cleaning fabrics, anti-infrared detection fabrics, anti-ultraviolet fabrics, wear-resistant fabrics, warmth-retaining fabrics and other special fabrics.

[0003] Among everyday specialty fabrics, sportswear has the greatest demand for waterproof fabrics, which are used to meet the outdoor waterproofing requirements of sports enthusiasts. Traditional waterproof fabrics are generally made of a composite of plastic or rubber and cloth. However, the heat and sweat generated by users during exercise cannot be discharged in time, greatly affecting the user experience. Based on this, waterproof and breathable materials are used. Waterproof and breathable materials can not only protect items from moisture erosion, but also allow them to pass through water vapor, thus achieving a waterproof and breathable effect. Existing waterproof and breathable materials mainly rely on two technologies: one is microporous membrane technology, and the other is coating technology. Coating technology refers to applying a waterproof coating (such as polyurethane coating) to the surface of the fabric. This coating can prevent moisture from entering and also allow moisture to evaporate. The other is microporous membrane technology, which essentially creates tiny holes on the surface of the material. Microporous membrane materials made of PTFE (polytetrafluoroethylene) can also prevent moisture from entering and allow moisture to evaporate.

[0004] However, due to the hydrophobicity and oleophobicity of water-soluble polytetrafluoroethylene materials, water and oil secreted by the human body will accumulate in the membrane pores, causing blockage. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a PTFE waterproof and breathable membrane for textile fabrics, which solves the problem that the membrane pores are easily blocked and ensures moisture permeability and oil permeability; the second purpose is to provide a method for preparing a PTFE waterproof and breathable membrane for textile fabrics.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A PTFE waterproof and breathable membrane for textile fabrics comprises a modified PTFE porous membrane and an amphiphilic coating.

[0008] A method for preparing a PTFE waterproof and breathable membrane for textile fabrics comprises the following steps:

[0009] The amphiphilic coating is coated on one side of the modified PTFE porous membrane on which the amphiphilic graphene oxide powder is deposited, and the membrane is dried to obtain a PTFE waterproof and moisture-permeable membrane for textile fabrics containing the amphiphilic coating.

[0010] Furthermore, the modified PTFE porous membrane is prepared by the following steps:

[0011] Step 1: adding graphene oxide, sodium chloride and deionized water in a ratio of 1g:200mg:1L into a reactor and stirring and mixing, and then ultrasonically dispersing for 20-40min to obtain a graphene oxide dispersion; stirring and dissolving octadecyldimethylbenzylammonium chloride with D80 solvent kerosene to obtain an octadecyldimethylbenzylammonium chloride solution with a mass fraction of 1.25%; mixing the graphene oxide dispersion and the octadecyldimethylbenzylammonium chloride solution, stirring at 3000-5000r / min for 4-8h to obtain an emulsion, and then adding a 1% sodium bisulfate aqueous solution, stirring at 90-100°C for 4-8h, filtering, washing the filter cake with anhydrous ethanol 2-3 times, and vacuum drying at 40-60°C to obtain amphiphilic graphene oxide powder;

[0012] The amount ratio of graphene oxide dispersion, octadecyldimethylbenzyl ammonium chloride solution and sodium bisulfate aqueous solution is 10 L:50 mL:50 mL;

[0013] Step 2: Grind the PTFE dispersion resin and pass it through an 8-10 mesh sieve, dry it in a vacuum at 30-45°C, add the dried PTFE dispersion resin to deionized water, and stir it at 6000-8000 r / min for 20-30 minutes to obtain a resin emulsion with a mass fraction of 60%;

[0014] Step 3: mixing a 10% polyvinyl alcohol solution, a 2% boric acid solution, and a resin emulsion in a mass ratio of 1g:0.05g:4g to obtain a spinning solution; preparing a primary fiber membrane by electrospinning, and then transferring the primary fiber membrane to a muffle furnace, keeping it warm at 260±5°C for 40-60min, washing it with anhydrous ethanol 3-5 times, and vacuum drying it at 40-60°C to obtain a PTFE porous membrane;

[0015] Step 4: Ultrasonic dispersion of amphiphilic graphene oxide powder with deionized water to obtain an amphiphilic graphene oxide dispersion with a mass fraction of 2%; unfold the PTFE porous membrane and spray the amphiphilic graphene oxide dispersion on its surface at a spraying rate of 1-2 mL / cm 2 , and vacuum dried at 60-80° C. to obtain a modified PTFE porous membrane with amphiphilic graphene oxide powder deposited on one side.

[0016] Furthermore, the amphiphilic coating is prepared by the following steps:

[0017] Step S1: dissolving N-vinylacetamide and emulsifier SR-10 in deionized water, then adding p-trifluoromethylstyrene, styrene, methyl acrylate, and acrylic acid, transferring the mixture to a reactor, and reacting the mixture at a stirring speed of 300-500 rpm and a temperature of 55-65° C. for 60-80 minutes to obtain a prepolymer;

[0018] The usage ratio of N-vinylacetamide, emulsifier SR-10, deionized water, trifluoromethylstyrene, styrene, methyl acrylate and acrylic acid is 1.5g: 0.1-0.15g: 5.5-6g: 1.1g: 3.4g: 3.3g: 0.14g.

[0019] Step S2: adding a 0.5% sodium bicarbonate solution by mass into a new reaction kettle, heating to 75-80° C., then adding the prepolymer and a 1% ammonium persulfate solution by mass, heating to 85±2° C., and reacting at a stirring speed of 300-500 r / min for 4-5 hours to obtain an amphiphilic coating;

[0020] The usage ratio of sodium bicarbonate solution, prepolymer and ammonium persulfate solution is 13g:2g:6g.

[0021] Beneficial effects of the present invention:

[0022] The PTFE waterproof and breathable membrane for textile fabrics of the present invention comprises a modified PTFE porous membrane and an amphiphilic coating. The amphiphilic coating is prepared by coating and drying an amphiphilic coating, and the side not coated with the amphiphilic coating has hydrophobicity and oleophobicity.

[0023] Polyvinyl alcohol solution is added during the preparation of the PTFE porous membrane. After the polyvinyl alcohol is heated and decomposed, it helps to increase the porosity of the PTFE porous membrane; amphiphilic graphene oxide powder is deposited on the surface of the PTFE porous membrane, which helps to increase the lipophilicity and hydrophilicity of the surface, and helps to increase the water permeability and oil permeability; after the amphiphilic coating is dried to form a film, it helps to fix the amphiphilic graphene oxide powder and helps to increase the water permeability and oil permeability, thereby avoiding the coating from having a significant impact on the performance of the PTFE waterproof and breathable membrane for textile fabrics. After being composited into textile fabrics, it helps to increase the discharge effect of sweat and grease from the textile fabrics, meeting the use requirements. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment provides a PTFE waterproof and breathable membrane for textile fabrics, including the following implementation steps:

[0027] Step 1: 1 kg of graphene oxide, 200 g of sodium chloride and 1000 L of deionized water were added to a reactor and stirred and mixed, and then ultrasonically dispersed for 20 min to obtain a graphene oxide dispersion; octadecyldimethylbenzyl ammonium chloride was stirred and dissolved with D80 solvent kerosene to obtain an octadecyldimethylbenzyl ammonium chloride solution with a mass fraction of 1.25%; 1000 L of the graphene oxide dispersion and 5 L of the octadecyldimethylbenzyl ammonium chloride solution were mixed, stirred at 3000 r / min for 4 h to obtain an emulsion, and then 5 L of a 1% sodium bisulfate aqueous solution was added, stirred at 90° C. for 4 h, filtered, and the filter cake was washed twice with anhydrous ethanol and vacuum dried at 40° C. to obtain amphiphilic graphene oxide powder.

[0028] Step 2: Grind the PTFE dispersion resin and pass it through an 8-mesh sieve, then vacuum dry it at 30°C. Add the dried PTFE dispersion resin into deionized water and stir it at 6000 r / min for 20 minutes to obtain a resin emulsion with a mass fraction of 60%.

[0029] Step 3: Mix 100 kg of 10% polyvinyl alcohol solution, 5 kg of 2% boric acid solution and 400 kg of resin emulsion to obtain a spinning solution; prepare a primary fiber membrane by spinning electrospinning, and then transfer the primary fiber membrane to a muffle furnace, keep it warm at 260±5°C for 40 minutes, wash it with anhydrous ethanol three times, and vacuum dry it at 40°C to obtain a PTFE porous membrane.

[0030] Step 4: Ultrasonic dispersion of amphiphilic graphene oxide powder with deionized water to obtain an amphiphilic graphene oxide dispersion with a mass fraction of 2%; unfold the PTFE porous membrane and spray the amphiphilic graphene oxide dispersion on its surface at a spraying volume of 1 mL / cm 2 , and vacuum dried at 60° C. to obtain a modified PTFE porous membrane with amphiphilic graphene oxide powder deposited on one side.

[0031] Step 5: Dissolve 1.5 kg of N-vinyl acetamide and 0.1 kg of emulsifier SR-10 in 5.5 kg of deionized water, then add 1.1 kg of trifluoromethylstyrene, 3.4 kg of styrene, 3.3 kg of methyl acrylate and 0.14 kg of acrylic acid, transfer them to a reactor, and react at a stirring speed of 300 r / min and 55°C for 60 minutes to obtain a prepolymer.

[0032] Step 6: Add 13 kg of 0.5% sodium bicarbonate solution into a new reactor, heat it to 75°C, then add 2 kg of prepolymer and 6 kg of 1% ammonium persulfate solution, heat it to 85±2°C, and keep it warm for 4 hours at a stirring speed of 300 r / min to obtain an amphiphilic coating.

[0033] Step 7: Apply the amphiphilic coating to the side of the modified PTFE porous membrane on which the amphiphilic graphene oxide powder is deposited, and dry it to obtain a PTFE waterproof and moisture-permeable membrane for textile fabrics containing the amphiphilic coating.

[0034] Example 2

[0035] This embodiment provides a PTFE waterproof and breathable membrane for textile fabrics, including the following implementation steps:

[0036] Step 1: 1 kg of graphene oxide, 200 g of sodium chloride and 1000 L of deionized water were added to a reactor and stirred and mixed, and then ultrasonically dispersed for 30 min to obtain a graphene oxide dispersion; octadecyldimethylbenzyl ammonium chloride was stirred and dissolved with D80 solvent kerosene to obtain an octadecyldimethylbenzyl ammonium chloride solution with a mass fraction of 1.25%; 1000 L of the graphene oxide dispersion and 5 L of the octadecyldimethylbenzyl ammonium chloride solution were mixed, stirred at 4000 r / min for 6 h to obtain an emulsion, and then 5 L of a 1% sodium bisulfate aqueous solution was added, stirred at 95° C. for 6 h, filtered, and the filter cake was washed twice with anhydrous ethanol and vacuum dried at 50° C. to obtain amphiphilic graphene oxide powder.

[0037] Step 2: Grind the PTFE dispersion resin and pass it through a 9-mesh sieve, then vacuum dry it at 40°C. Add the dried PTFE dispersion resin into deionized water and stir it at 7000 r / min for 25 minutes to obtain a resin emulsion with a mass fraction of 60%.

[0038] Step 3: Mix 100 kg of 10% polyvinyl alcohol solution, 5 kg of 2% boric acid solution and 400 kg of resin emulsion to obtain a spinning solution; prepare a primary fiber membrane by spinning electrospinning, and then transfer the primary fiber membrane to a muffle furnace, keep it warm at 260±5°C for 50 minutes, wash it with anhydrous ethanol 4 times, and vacuum dry it at 50°C to obtain a PTFE porous membrane.

[0039] Step 4: Ultrasonic dispersion of amphiphilic graphene oxide powder with deionized water to obtain an amphiphilic graphene oxide dispersion with a mass fraction of 2%; unfold the PTFE porous membrane and spray the amphiphilic graphene oxide dispersion on its surface at a spraying rate of 1.5 mL / cm 2, and vacuum dried at 70° C. to obtain a modified PTFE porous membrane with amphiphilic graphene oxide powder deposited on one side.

[0040] Step 5: Dissolve 1.5 kg of N-vinyl acetamide and 0.12 kg of emulsifier SR-10 in 5.8 kg of deionized water, then add 1.1 kg of trifluoromethylstyrene, 3.4 kg of styrene, 3.3 kg of methyl acrylate and 0.14 kg of acrylic acid, transfer them to a reactor, and react at a stirring speed of 400 r / min and 60°C for 70 minutes to obtain a prepolymer.

[0041] Step 6: Add 13 kg of 0.5% sodium bicarbonate solution into a new reactor, heat it to 78°C, then add 2 kg of prepolymer and 6 kg of 1% ammonium persulfate solution, heat it to 85±2°C, and keep it warm for 4.5 hours at a stirring speed of 400 r / min to obtain an amphiphilic coating.

[0042] Step 7: Apply the amphiphilic coating to the side of the modified PTFE porous membrane where the amphiphilic graphene oxide powder is deposited, and dry it to obtain a PTFE waterproof and breathable membrane for textile fabrics containing the amphiphilic coating.

[0043] Example 3

[0044] This embodiment provides a PTFE waterproof and breathable membrane for textile fabrics, including the following implementation steps:

[0045] Step 1: 1 kg of graphene oxide, 200 g of sodium chloride and 1000 L of deionized water were added to a reactor and stirred and mixed, and then ultrasonically dispersed for 40 min to obtain a graphene oxide dispersion; octadecyldimethylbenzyl ammonium chloride was stirred and dissolved with D80 solvent kerosene to obtain an octadecyldimethylbenzyl ammonium chloride solution with a mass fraction of 1.25%; 1000 L of the graphene oxide dispersion and 5 L of the octadecyldimethylbenzyl ammonium chloride solution were mixed, stirred at 5000 r / min for 8 h to obtain an emulsion, and then 5 L of a 1% sodium bisulfate aqueous solution was added, stirred at 100 ° C for 8 h, filtered, and the filter cake was washed with anhydrous ethanol 3 times, and vacuum dried at 60 ° C to obtain amphiphilic graphene oxide powder.

[0046] Step 2: Grind the PTFE dispersion resin and pass it through a 10-mesh sieve, then vacuum dry it at 45°C. Add the dried PTFE dispersion resin into deionized water and stir it at 8000 r / min for 30 minutes to obtain a resin emulsion with a mass fraction of 60%.

[0047] Step 3: Mix 100 kg of 10% polyvinyl alcohol solution, 5 kg of 2% boric acid solution and 400 kg of resin emulsion to obtain a spinning solution; prepare a primary fiber membrane by spinning electrospinning, and then transfer the primary fiber membrane to a muffle furnace, keep it warm at 260±5°C for 60 minutes, wash it with anhydrous ethanol 5 times, and vacuum dry it at 60°C to obtain a PTFE porous membrane.

[0048] Step 4: Ultrasonic dispersion of amphiphilic graphene oxide powder with deionized water to obtain an amphiphilic graphene oxide dispersion with a mass fraction of 2%; unfold the PTFE porous membrane and spray the amphiphilic graphene oxide dispersion on its surface at a spraying volume of 2 mL / cm 2 , and vacuum dried at 80° C. to obtain a modified PTFE porous membrane with amphiphilic graphene oxide powder deposited on one side.

[0049] Step 5: Dissolve 1.5 kg of N-vinyl acetamide and 0.15 kg of emulsifier SR-10 in 6 kg of deionized water, then add 1.1 kg of trifluoromethylstyrene, 3.4 kg of styrene, 3.3 kg of methyl acrylate and 0.14 kg of acrylic acid, transfer them to a reactor, and react at a stirring speed of 500 r / min and 65°C for 60-80 minutes to obtain a prepolymer.

[0050] Step 6: Add 13 kg of 0.5% sodium bicarbonate solution into a new reactor, heat it to 80°C, then add 2 kg of prepolymer and 6 kg of 1% ammonium persulfate solution, heat it to 85±2°C, and keep it warm for 4-5 hours at a stirring speed of 500 r / min to obtain an amphiphilic coating.

[0051] Step 7: Apply the amphiphilic coating to the side of the modified PTFE porous membrane on which the amphiphilic graphene oxide powder is deposited, and dry it to obtain a PTFE waterproof and moisture-permeable membrane for textile fabrics containing the amphiphilic coating.

[0052] Comparative Example 1: Based on Example 3, the amphiphilic graphene oxide powder was not deposited, and the amphiphilic coating was directly coated on the surface of the PTFE porous membrane. The other steps remained unchanged to obtain a PTFE waterproof and moisture-permeable membrane for textile fabrics.

[0053] Comparative Example 2: Based on Example 3, a commercially available polyurethane coating (purchased from Anhui Chunxiao Chemical Co., Ltd., brand A06) was directly coated on the surface of the modified PTFE porous membrane and dried to form a coating of the same thickness. The other steps remained unchanged to obtain a PTFE waterproof and breathable membrane for textile fabrics.

[0054] The total thickness of the PTFE waterproof and breathable membrane for textile fabrics in the examples and comparative examples is 0.18 mm, and the coating thickness is 0.08 mm.

[0055] Performance testing was conducted on Examples 1-3 and Comparative Examples 1-2. 50 cm x 50 cm specimens were prepared using PTFE waterproof and breathable membranes for different textile fabrics. The moisture permeability of the various specimens was measured according to GB / T 12704.1-2009. According to the standard, 34 mL of distilled water, consistent with the test temperature, was accurately measured using a graduated cylinder and injected into a breathable cup, leaving the water approximately 10 mm from the coated surface (test surface) of the specimen. The specimen was placed face-down on the breathable cup, fitted with a gasket and pressure ring, and the cap was screwed on. The pressure ring, gasket, and permeable cup were then sealed from the sides with vinyl tape to form the test assembly. The test assembly was quickly placed horizontally in a test chamber maintained at 38 ± 3°C, 50 ± 2% relative humidity, and an airflow rate of 0.3-0.5 m / s. After 0.5 h of equilibration, the specimens were weighed individually, with the weighing time outside the chamber not exceeding 15 s. After 24 h of testing, the specimens were weighed again according to the aforementioned procedure. During the entire test, the test assembly must be kept level to prevent the water in the cup from contacting the test surface of the sample. The water vapor transmission capacity (WVT) of the sample is calculated using the following formula:

[0056] WVT=(△m-△m') / A×t

[0057] Where: △m is the difference between two weighings of the same test combination, △m' is the difference between two weighings of the blank sample, and if no blank is made, △m'=0, A is the effective test area. The test area of ​​the moisture permeable cup in this experiment is 0.00283m2, and t is the test time.

[0058] The distilled water in the above conditions was replaced with commercially available vegetable oil (Luhua peanut oil) to test the oil penetration.

[0059] The tensile strength and elongation at break of different samples were tested according to GB / T24218.3-2010. The clamping distance during the test was 200 mm, the tensile rate was 100 mm / min, and each group of samples was measured three times to obtain the average value.

[0060] According to the PTFE waterproof and breathable membrane for textile fabrics in different embodiments and comparative examples, no coating is applied, and the lipophilicity of the PTFE porous membrane or modified PTFE porous membrane is tested. The oil contact angle is measured by commercially available vegetable oil. The smaller the contact angle, the better the lipophilicity.

[0061] The results are shown in Table 1:

[0062] Table 1

[0063] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 <![CDATA[Water vapor transmission rate g / (m 2 ×24h)]]> 7762 7773 7781 6535 7128 <![CDATA[Oil penetration rate g / (m 2 ×24h)]]> 949 951 954 212 542 Tensile strength at break MPa 30.2 30.5 31.0 31.0 25.7 Elongation at break % 67.21 67.17 67.05 67.06 69.45 Oil contact angle° 15.5 15.4 15.2 33.7 15.2

[0064] It can be seen from Table 1 that the moisture permeability and oil permeability of the PTFE waterproof and breathable membrane for textile fabrics after the deposition of amphiphilic graphene oxide powder are greatly improved. The amphiphilic coating also has an effect on the moisture permeability and oil permeability, which is better than the commercially available polyurethane coating.

[0065] It should be noted that, in this document, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a PTFE waterproof and breathable membrane for textile fabrics, characterized in that: The steps include: Step 1: Graphene oxide, sodium chloride and deionized water are mixed in a ratio of 1g:200mg:1L, and ultrasonically dispersed to obtain a graphene oxide dispersion; octadecyldimethylbenzylammonium chloride is dissolved in D80 solvent kerosene to obtain an octadecyldimethylbenzylammonium chloride solution with a mass fraction of 1.25%; the graphene oxide dispersion and the octadecyldimethylbenzylammonium chloride solution are mixed, stirred at 3000-5000r / min for 4-8h to obtain an emulsion, and then a 1% sodium bisulfate aqueous solution is added, stirred at 90-100°C for 4-8h, filtered, washed, and vacuum dried to obtain amphiphilic graphene oxide powder; Step 2: Ultrasonic dispersion of amphiphilic graphene oxide powder with deionized water to obtain an amphiphilic graphene oxide dispersion with a mass fraction of 2%; unfold the PTFE porous membrane and spray the amphiphilic graphene oxide dispersion on one side of the membrane at a spraying rate of 1-2 mL / cm 2 , vacuum drying to obtain a modified PTFE porous membrane; Step 3: applying an amphiphilic coating to the side of the modified PTFE porous membrane on which the amphiphilic graphene oxide powder is deposited, and drying to obtain a PTFE waterproof and moisture-permeable membrane for textile fabrics containing the amphiphilic coating; The amphiphilic coating is prepared by the following steps: Add 0.5% sodium bicarbonate solution by mass into a new reactor, heat it to 75-80°C, then add the prepolymer and 1% ammonium persulfate solution by mass, heat it to 85±2°C, and keep the mixture warm for 4-5 hours at a stirring speed of 300-500 r / min to obtain an amphiphilic coating; The prepolymer is prepared by the following steps: Dissolve N-vinylacetamide and emulsifier SR-10 in deionized water, then add p-trifluoromethylstyrene, styrene, methyl acrylate and acrylic acid, transfer to a reactor, and react for 60-80 minutes at a stirring speed of 300-500 r / min and a temperature of 55-65° C. to obtain a prepolymer.

2. The method for preparing a PTFE waterproof and breathable membrane for textile fabrics according to claim 1, wherein: The usage ratio of the graphene oxide dispersion, the octadecyldimethylbenzylammonium chloride solution and the sodium bisulfate aqueous solution is 10 L:50 mL:50 mL.

3. The method for preparing a PTFE waterproof and breathable membrane for textile fabrics according to claim 1, wherein: The PTFE porous membrane is prepared by the following steps: A 10% by mass polyvinyl alcohol solution, a 2% by mass boric acid solution, and a resin emulsion were uniformly mixed in a mass ratio of 1g:0.05g:4g to obtain a spinning solution; the spinning solution was electrospun to prepare a nascent fiber membrane, and then the nascent fiber membrane was kept warm at 260±5°C for 40-60min, washed, and vacuum dried to obtain a PTFE porous membrane.

4. The method for preparing a PTFE waterproof and breathable membrane for textile fabrics according to claim 3, wherein: The resin emulsion is prepared by the following steps: The PTFE dispersion resin is ground and then passed through an 8-10 mesh sieve and dried. The dried PTFE dispersion resin is added to deionized water and stirred at 6000-8000 r / min for 20-30 minutes to obtain a resin emulsion with a mass fraction of 60%.

5. The method for preparing a PTFE waterproof and breathable membrane for textile fabrics according to claim 1, wherein: The usage ratio of the sodium bicarbonate solution, the prepolymer and the ammonium persulfate solution is 13g:2g:6g.

6. The method for preparing a PTFE waterproof and breathable membrane for textile fabrics according to claim 1, wherein: The usage ratio of N-vinylacetamide, emulsifier SR-10, deionized water, p-trifluoromethylstyrene, styrene, methyl acrylate and acrylic acid is 1.5g: 0.1-0.15g: 5.5-6g: 1.1g: 3.4g: 3.3g: 0.14g.

7. A PTFE waterproof and breathable membrane for textile fabrics, characterized in that: It is prepared by the preparation method according to any one of claims 1 to 6.