A fluorine-free waterproof and sound-permeable film and its preparation method

Abstract

The present invention discloses a fluorine-free waterproof and sound-permeable membrane and a preparation method thereof. The fluorine-free waterproof and sound-permeable membrane comprises, by mass percentage: 30% - 40% of a fluorine-free polymer; 4.5 - 11.5% of a fluorine-free waterproofing agent; 0.5% - 3.5% of a cross-linking agent, and 45% - 65% of a solvent; the solvent is N,N-dimethylformamide, N,N-dimethylacetamide, and a mixed solvent of acetone and ethyl acetate, and the mass ratio of the amide solvent in the mixed solvent is 60% - 85%; the preparation method of the fluorine-free waterproof and sound-permeable membrane includes: preparing a spinning solution; performing electrospinning by using an electrospinning device to obtain a continuous and uniform nanofiber membrane; uniformly depositing nanofibers onto a nanofiber membrane substrate, and then performing post-treatment to obtain the finished fluorine-free waterproof and sound-permeable membrane; through fine control of the selection of raw materials, the preparation of the spinning solution, the electrospinning process parameters, and the post-treatment conditions, the present invention successfully prepares a safe and healthy product that has good waterproof and air permeability, high resilience, excellent acoustic performance and does not contain fluorine.

Description

Technical Field

[0001] The present invention relates to the technical field of functional thin film materials, and particularly relates to a fluorine-free waterproof and sound-permeable film and a preparation method thereof. Background Art

[0002] A waterproof and sound-permeable film is a material with both waterproof and sound-permeable functions, and is widely used in fields such as electronic devices, medical equipment, and industrial equipment. With the miniaturization and multifunctionalization of electronic devices, the demand for waterproof and sound-permeable films is increasing day by day. Traditional waterproof and sound-permeable films mostly use expanded polytetrafluoroethylene (ePTFE) or some other fluorine-containing materials. Although such materials can provide a certain degree of waterproof or hydrophobic effect, these materials themselves are fluorine-containing materials, and some will release harmful substances such as PFAS during the production process, posing potential risks to the environment and human health. Such substances have been successively restricted by multiple national laws. In addition, traditional materials may not be able to simultaneously meet the requirements of waterproofing, breathability, maintaining high audio consistency, and low sound loss. With the enhancement of environmental awareness and the development of technology, the development of fluorine-free waterproof and sound-permeable films with good acoustic properties has become a research hotspot.

[0003] Therefore, the present invention provides a fluorine-free waterproof and sound-permeable film and a preparation method thereof. The fluorine-free waterproof and sound-permeable film prepared by the present invention has excellent waterproof and breathable properties on the basis of the traditional waterproof and sound-permeable film, and also has excellent resilience. After the hydrostatic pressure test, it can quickly rebound and restore its good acoustic performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a fluorine-free waterproof and sound-permeable film and a preparation method thereof to obtain a safe and healthy product with excellent waterproof and breathable properties, excellent acoustic performance, and no fluorine.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A fluorine-free waterproof and sound-permeable film, calculated by mass percentage, includes: 30% - 40% of fluorine-free polymer; 4.5 - 11.5% of fluorine-free waterproof agent; 0.5% - 3.5% of cross-linking agent, and 45% - 65% of solvent;

[0007] Among them, the fluorine-free waterproof agent is an oil-based fluorine-free waterproof agent, and the oil-based fluorine-free waterproof agent includes, but is not limited to, polyurethane-based oil-based fluorine-free waterproof agents and long-chain alkane-based oil-based fluorine-free waterproof agents;

[0008] The fluorine-free polymer includes, but is not limited to, polyurethane, polyacrylonitrile, and polystyrene;

[0009] The cross-linking agent is selected from one or more of isocyanate-based cross-linking agents, amino-based cross-linking agents, and silicone-based cross-linking agents;

[0010] The solvent is N,N-dimethylformamide, N,N-dimethylacetamide, and a mixed solvent of acetone and ethyl acetate. The mass ratio of the amide solvent in the mixed solvent is 60% - 85%.

[0011] Furthermore, the oil-based fluorine-free waterproofing agent is a natural-source or synthetic fluorine-free compound.

[0012] Preferably, the organosilane crosslinking agent is 3-aminopropyltriethoxysilane (APTES), γ-glycidoxypropyltrimethoxysilane (GPTMS), γ-methacryloxypropyltrimethoxysilane (MAPTMS), methyltrimethoxysilane (MTMS), tetraethoxysilane (TEOS), hexamethyldisilazane (HMDS), or tetramethyldisilazane (TMDS).

[0013] Preferably, the isocyanate crosslinking agent is toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), tetramethylxylylene diisocyanate (TMXDI), or cyclohexane diisocyanate (CHDI).

[0014] Preferably, the amino crosslinking agent is ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), 3-aminopropyltriethoxysilane (APTES), or N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (AEPTMS).

[0015] Preferably, the polyurethane-based oil-based fluorine-free waterproofing agent is selected from one or more of polyurethane prepolymers, polyurethane-modified oils, polyurethane acrylates, polyurethane-modified epoxy resins, and polyurethane silicone oils.

[0016] Preferably, the long-chain alkane-based oil-based fluorine-free waterproofing agent is selected from one or more of microcrystalline wax, polyethylene wax, oxidized polyethylene wax, Fischer-Tropsch wax, and alkyl ketene dimer (AKD).

[0017] A method for preparing a fluorine-free waterproof and sound-permeable membrane includes the following steps:

[0018] S1. Preparation of the spinning solution: Load the solvent into a stirring device, disperse the fluorine-free polymer and the fluorine-free waterproofing agent in the solvent, then add the crosslinking agent thereto and stir to form a spinning solution. Stir for 12 - 20 h to make the spinning solution form a homogeneous system. After stirring, let it stand for 3 - 6 h to remove the bubbles in the spinning solution;

[0019] S2. Electrospinning: Add the degassed spinning solution from step S1 into the electrospinning equipment. Adjust the liquid output of the nozzle by controlling the liquid supply speed of each module of the electrospinning equipment, and coordinate with the running speed of the conveyor belt for collection to control the gram weight of the stacked nanofiber membrane. Control the diameter and morphology of the nanofibers by controlling the magnitude of the high-voltage electric field of the high-voltage system and the receiving distance between the spinning needle and the collection area; obtain a continuous and uniform nanofiber membrane by controlling the swing amplitude and speed of the array needle system of each module;

[0020] S3. Rewinding: Use the wound nanofiber membrane substrate as the collection auxiliary material to run together with the conveyor belt. After passing through the array needle system of each module, the nanofibers are evenly deposited on the nanofiber membrane substrate and enter the rewinding device;

[0021] S4. Post-treatment: Send the nanofiber membrane receiving the nanofibers into the post-treatment equipment, adjust the temperature, pressing time, and pressure to obtain the finished product of the fluorine-free waterproof and sound-permeable membrane; make the film obtain the best physical and mechanical properties;

[0022] S5. Testing and verification: Test the waterproof performance, breathability, and acoustic performance of the finished product of the fluorine-free waterproof and sound-permeable membrane to ensure that it meets the high-standard requirements.

[0023] Preferably, in step S2, the gram weight of the stacked nanofiber membrane is controlled to be 2 - 20 g / m 2 ; control the diameter and morphology of the nanofibers to obtain nanofibers with a diameter of 200 nm - 3 μm.

[0024] Preferably, obtain a continuous and uniform nanofiber membrane with a width of up to 1 m by controlling the swing amplitude and speed of the array needle system of each module.

[0025] Preferably, the voltage of the electrospinning equipment is 50 kV - 70 kV, the receiving distance is 20 cm - 40 cm, and the moving speed of the nozzle is 1.0 m / min - 3.0 m / min.

[0026] Preferably, in step S4, the adjusted temperature is 80 °C - 160 °C, the pressing time is 2 s - 90 s, the pressure is 0.05 - 0.5 MPa, and the pressing gap is 0.1 mm - 0.5 mm.

[0027] Preferably, after at least 5 rounds of hydrostatic pressure resistance tests with a hydrostatic pressure of more than 20 kPa for 30 minutes, the fluorine-free waterproof and sound-permeable membrane can quickly rebound within a few minutes.

[0028] A system for preparing the above-mentioned fluorine-free waterproof and sound-permeable membrane includes a mixing system that can uniformly configure the spinning solution, a large electrospinning unit that can adjust various spinning parameters, and a post-treatment device.

[0029] Preferably, the electrospinning unit for adjusting the spinning parameters further includes a conveyor belt (11), a conveyor belt driving wheel (12), a receiving substrate (13), a unwinding wheel (14), a winding wheel (15), and an array of needles (16).

[0030] In the above text, the crosslinking agent can form a crosslinked structure with the components containing active groups in the spinning solution, such as the polyurethane prepolymer in the polyurethane waterproofing agent, enhancing the anti-aging performance and mechanical properties of the waterproof and sound-permeable membrane.

[0031] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0032] 1. By finely controlling the selection of raw materials, the preparation of the spinning solution, the spinning process parameters, and the post-treatment conditions, the present invention has successfully prepared a safe and healthy product that combines good waterproof and air permeability, high resilience, excellent acoustic performance, and is fluorine-free;

[0033] 2. The present invention not only improves the practical value of the product, but also provides a new solution for related industries, promoting the development of green and environmentally friendly materials. Especially for audio equipment manufacturers, this new material provides better audio consistency, less sound loss, and after withstanding water pressure, it can quickly rebound and restore acoustic performance, thus enhancing the user experience. Description of the Drawings

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, some of the following drawings are embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a scanning electron microscope image of the microporous fiber structure of the fluorine-free waterproof and sound-permeable membrane in Example 1 of the present invention;

[0036] Figure 2 It is an infrared spectrum diagram before and after the crosslinking reaction of the organosilicon crosslinking agent in Example 1 of the present invention;

[0037] Figure 3 It is a scanning electron microscope image of the fluorine-free waterproof and sound-permeable membrane with a crosslinking agent in Example 1 and the fluorine-free waterproof and sound-permeable membrane without a crosslinking agent in Comparative Example 1 (after aging at 85 °C and 85% relative humidity for 500 h, scale bar = 5 µm; the left figure is the membrane without a crosslinking agent in Comparative Example 1, and the right figure is the membrane with a crosslinking agent in Example 1);

[0038] Figure 4 It is a schematic diagram of the electrospinning unit in Example 1 of the present invention;

[0039] Figure 5 It is a schematic diagram of the original state of the stretching and resilience test of the fluorine-free waterproof and sound-permeable film in Example 1 of the present invention and the ePTFE film in Comparative Example 2;

[0040] Figure 6 It is a schematic diagram of the stretching 10% resilience test of the fluorine-free waterproof and sound-permeable film in Example 1 of the present invention and the ePTFE film in Comparative Example 2;

[0041] Figure 7 It is a schematic diagram of the stretching 20% resilience test of the fluorine-free waterproof and sound-permeable film in Example 1 of the present invention and the ePTFE film in Comparative Example 2;

[0042] Figure 8 It is a schematic diagram of the stretching 30% resilience test of the fluorine-free waterproof and sound-permeable film in Example 1 of the present invention and the ePTFE film in Comparative Example 2;

[0043] Figure 9 It is a schematic diagram of the audio recovery test of the fluorine-free waterproof and sound-permeable film in Example 1 of the present invention before and after water pressure resistance;

[0044] Among them, attached Figure 4 In the figure: 11 - conveyor belt, 12 - conveyor belt driving wheel, 13 - receiving substrate, 14 - unwinding wheel, 15 - winding wheel, 16 - array needle. Detailed implementation manners

[0045] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners are now described in detail.

[0046] The present invention will be further described below in conjunction with the embodiments, but the present invention is not limited to the following embodiments. The implementation conditions adopted in the embodiments can be further adjusted according to different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in each implementation manner of the present invention can be combined with each other as long as they do not conflict with each other.

[0047] Example 1

[0048] See attached Figures 1-9 , this example provides a fluorine-free waterproof and sound-permeable film, which includes, by mass percentage: 35% fluorine-free polymer; 6% fluorine-free waterproof agent; 2% cross-linking agent, 57% solvent;

[0049] Among them, the fluorine-free waterproof agent is an oily fluorine-free waterproof agent, and the oily fluorine-free waterproof agent is polyurethane prepolymer, alkyl ketene dimer;

[0050] The fluorine-free polymer is polyurethane, polyacrylonitrile, and polystyrene;

[0051] The crosslinking agent is a silicone-based crosslinking agent, and the silicone-based crosslinking agent is N-β(aminoethyl)-γ-aminopropyltrimethoxysilane;

[0052] The solvent is N,N-dimethylformamide, N,N-dimethylacetamide, and a mixed solvent of acetone and ethyl acetate. The mass ratio of the amide solvent in the mixed solvent is 80%;

[0053] The preparation method of the fluorine-free waterproof and sound-permeable membrane includes the following steps:

[0054] S1. Preparation of the spinning solution: Load the solvent into a stirring device, disperse the fluorine-free polymer and the fluorine-free waterproof agent in the solvent, and then add the crosslinking agent thereto and stir to form a spinning solution. Stir for 18 h to make the spinning solution form a homogeneous system. After stirring, let it stand for 6 h to discharge the bubbles in the spinning solution;

[0055] S2. Electrospinning: Add the spinning solution with discharged bubbles in step S1 into an electrospinning device. Adjust the liquid output of the nozzle by controlling the liquid supply speed of each module of the electrospinning device, and match it with the running speed of the conveyor belt for collection. Control the gram weight of the stacked nanofiber membrane to be 12 g / m 2 , and control the diameter and morphology of the nanofibers by controlling the magnitude of the high-voltage electric field of the high-voltage system and the receiving distance between the spinning needle and the collection area to obtain nanofibers with a diameter of 800 nm; Obtain a continuous and uniform nanofiber membrane with a width of up to 1 m by controlling the swing amplitude and swing speed of the array needle system of each module;

[0056] S3. Rewinding: Use the wound nanofiber membrane substrate as a collection auxiliary material to rotate with the conveyor belt. After passing through the array needle system of each module, the nanofibers are uniformly deposited on the nanofiber membrane substrate and enter the rewinding device;

[0057] S4. Post-treatment: Send the nanofiber membrane with received nanofibers into a post-treatment device, adjust the temperature to 120 °C, the pressing time to 50 s, the pressure to 0.25 MPa, and the pressing gap to 0.3 mm to obtain the finished product of the fluorine-free waterproof and sound-permeable membrane; Make the film obtain the best physical and mechanical properties;

[0058] S5. Testing and verification: Test the waterproof performance, air permeability, and acoustic performance of the finished product of the fluorine-free waterproof and sound-permeable membrane to ensure that it meets the high-standard requirements.

[0059] The voltage of the electrospinning device is 60 kV, the receiving distance is 30 cm, and the moving speed of the nozzle is 2.0 m / min.

[0060] The system for preparing the above-mentioned fluorine-free waterproof and sound-permeable membrane includes a mixing solution system capable of uniformly configuring a spinning solution, a large-scale electrospinning unit capable of adjusting various electrospinning parameters, and a post-treatment device; the electrospinning unit for adjusting electrospinning parameters further includes a conveyor belt (11), a conveyor belt driving wheel (12), a receiving substrate (13), an unwinding wheel (14), a winding wheel (15), and an array of needles (16).

[0061] Example 2

[0062] This example provides a fluorine-free waterproof and sound-permeable membrane, which, by mass percentage, includes: 35% of fluorine-free polymer; 8% of fluorine-free waterproof agent; 2.5% of cross-linking agent, and 54.5% of solvent.

[0063] Among them, the fluorine-free waterproof agent is an oil-based fluorine-free waterproof agent, and the oil-based fluorine-free waterproof agent is a polyurethane prepolymer and an alkyl ketene dimer.

[0064] The fluorine-free polymer is polyurethane, polyacrylonitrile, and polystyrene.

[0065] The cross-linking agent is an organosilicon-based cross-linking agent, and the organosilicon-based cross-linking agent is aminopropyltriethoxysilane (APTES).

[0066] The solvent is N,N-dimethylformamide, N,N-dimethylacetamide, and a mixed solvent of acetone and ethyl acetate. The mass proportion of the amide solvent in the mixed solvent is 80%.

[0067] The preparation method of the fluorine-free waterproof and sound-permeable membrane includes the following steps:

[0068] S1. Preparation of spinning solution: Load the solvent into a stirring device, disperse the fluorine-free polymer and the fluorine-free waterproof agent in the solvent, and then add the cross-linking agent thereto and stir to form a spinning solution. Stir for 18 h to make the spinning solution form a homogeneous system. After stirring, let it stand for 6 h to discharge the bubbles in the spinning solution.

[0069] S2. Electrospinning: Add the spinning solution with discharged bubbles in step S1 into an electrospinning device. Adjust the liquid output of the nozzle by controlling the liquid supply speed of each module of the electrospinning device, and match it with the running speed of the conveyor belt for collection. Control the gram weight of the stacked nanofiber membrane to be 12 g / m 2 , and control the diameter and morphology of the nanofibers by controlling the magnitude of the high-voltage electric field of the high-voltage system and the receiving distance between the spinning needle and the collection area to obtain nanofibers with a diameter of 1000 nm; obtain a continuous and uniform nanofiber membrane with a width of up to 1 m by controlling the swing amplitude and swing speed of the array needle system of each module.

[0070] S3. Rewinding: The wound nanofiber spun membrane substrate is used as a collecting auxiliary material and runs together with the conveyor belt. After passing through the array needle system of each module, the nanofibers are evenly deposited on the nanofiber spun membrane substrate and then enter the rewinding device.

[0071] S4. Post-treatment: The nanofiber spun membrane with received nanofibers is sent into the post-treatment equipment. The temperature is adjusted to 120 °C, the lamination time is 50 s, the pressure is 0.25 MPa, and the lamination gap is 0.3 mm to obtain the finished product of the fluorine-free waterproof and sound-permeable membrane, enabling the film to obtain the best physical and mechanical properties.

[0072] S5. Testing and verification: The waterproof performance, air permeability, and acoustic performance of the finished product of the fluorine-free waterproof and sound-permeable membrane are tested to ensure that it meets the high-standard requirements.

[0073] The voltage of the electrospinning equipment is 60 kV, the receiving distance is 30 cm, and the moving speed of the nozzle is 2.0 m / min.

[0074] The system for preparing the above-mentioned fluorine-free waterproof and sound-permeable membrane includes a mixing solution system capable of uniformly configuring the spinning solution, a large-scale electrospinning unit capable of adjusting various spinning parameters, and a post-treatment device. The electrospinning unit for adjusting the spinning parameters further includes a conveyor belt (11), a conveyor belt driving wheel (12), a receiving substrate (13), an unwinding wheel (14), a rewinding wheel (15), and an array of needles (16).

[0075] Comparative Example 1

[0076] See Appendix Figure 3 , this comparative example is based on Example 1 above, and the same parts as those in the above example will not be elaborated.

[0077] In this comparative example, no cross-linking agent is added.

[0078] Comparative Example 2

[0079] See Appendix Figures 5-8 , this comparative example is an ePTFE membrane (the ePTFE membrane is a product of Shanghai Jinyou Fluorine Materials Co., Ltd.).

[0080] The products of Examples 1 - 2 and Comparative Example 1 above are tested, and the test results are shown in Table 1 (where the air permeability is tested for 240 hours under double 85 conditions).

[0081] Table 1

[0082]

[0083] As shown in Table 1, after 500 hours of double 85 tests, the air permeability of the film product without a crosslinking agent was only 284.7 ± 11.93 ml / min / cm² @ 7KPa, while that of the film product with a crosslinking agent added was 3096 ± 34.07 ml / min / cm² @ 7Kpa; through the tensile test, the tensile strength of the film product with a crosslinking agent added was 18.95 MPa, and that of the film product without a crosslinking agent was only 8.69 MPa.

[0084] Figure 2 Infrared spectroscopy showed that there was no carbonyl peak in N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, and a carbonyl absorption peak of urethane (1675.38 cm-1) appeared in the substance formed after the crosslinking reaction with the polyurethane prepolymer in the waterproofing agent, indicating that the crosslinking reaction between isocyanate and amino groups occurred after adding the double-amino organosilicon crosslinking agent.

[0085] Figure 3 The scanning electron microscope images showed that after 500 hours of double 85 aging tests, the fibers on the film product without a crosslinking agent added had aged and broken, while the fibers on the film product that had undergone the crosslinking reaction showed no obvious changes after the aging test.

[0086] In summary, through the fine control of the selection of raw materials, the preparation of the spinning solution, the spinning process parameters, and the post-treatment conditions, the present invention has successfully prepared a safe and healthy product with good waterproof and breathable properties, high resilience, excellent acoustic performance, and no fluorine; the present invention not only improves the practical value of the product, but also provides a new solution for related industries, promoting the development of green and environmentally friendly materials. Especially for audio equipment manufacturers, this new material provides better audio consistency, less sound loss, and can quickly rebound and restore acoustic performance after withstanding water pressure, thus enhancing the user experience.

[0087] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An anti-aging fluorine-free waterproof sound-permeable film, characterized in that, By mass percentage, it includes: 30% - 40% of fluorine-free polymer; 4.5 - 11.5% of fluorine-free water repellent; 0.5% - 3.5% of crosslinking agent, and 45% - 65% of solvent; Among them, the fluorine-free water repellent is an oil-based fluorine-free water repellent, and the oil-based fluorine-free water repellent includes polyurethane-based oil-based fluorine-free water repellent and long-chain alkane-based oil-based fluorine-free water repellent; The fluorine-free polymer includes polyurethane, polyacrylonitrile and polystyrene; The crosslinking agent is an amino-based crosslinking agent; The solvent is N,N-dimethylformamide, N,N-dimethylacetamide and a mixed solvent of acetone and ethyl acetate, and the mass proportion of the amide solvent in the mixed solvent is 60% - 85%; The polyurethane-based oil-based fluorine-free water repellent is a polyurethane prepolymer.

2. The anti-aging fluorine-free waterproof sound-permeable film according to claim 1, wherein The long-chain alkane-based oil-based fluorine-free water repellent is selected from one or more of microcrystalline wax, polyethylene wax, oxidized polyethylene wax, Fischer-Tropsch wax, and alkyl ketene dimer.

3. A method for preparing a fluorine-free waterproof and sound-permeable film with anti-aging property as described in claim 1, characterized in that, It includes the following steps: S1. Preparation of spinning solution: Load the solvent into a stirring device, disperse the fluorine-free polymer and the fluorine-free water repellent in the solvent, then add the crosslinking agent thereto and stir to form a spinning solution. Stir for 12 - 20 h to make the spinning solution form a homogeneous system. After stirring, let it stand for 3 - 6 h to discharge the bubbles in the spinning solution; S2. Electrospinning: Add the spinning solution with discharged bubbles in step S1 into an electrospinning device. Adjust the liquid output of the needle head by controlling the liquid supply speed of each module of the electrospinning device, and match the running speed of the conveyor belt for collection to control the gram weight of the stacked nanofiber membrane. Control the diameter morphology of the nanofibers by controlling the magnitude of the high-voltage electric field of the high-voltage system and the receiving distance between the spinning needle head and the collection area; Obtain a continuous and uniform nanofiber membrane by controlling the swing amplitude and swing speed of the array needle head system of each module; S3. Rewinding: Use the wound nanofiber membrane substrate as a collection auxiliary material to run together with the conveyor belt. After passing through the array needle head system of each module, the nanofibers are uniformly deposited on the nanofiber membrane substrate and enter the rewinding device; S4. Post-treatment: Send the nanofiber membrane substrate receiving nanofibers into a post-treatment device, adjust the temperature, pressing time and pressure to obtain the finished product of the fluorine-free waterproof and sound-permeable membrane; S5. Testing and verification: Test and verify the waterproof performance, air permeability and acoustic performance of the finished product of the fluorine-free waterproof and sound-permeable membrane.

4. The preparation method of the anti-aging fluorine-free waterproof and sound-permeable membrane according to claim 3, characterized in that, In step S2, the gram weight of the controlled stacked nanofiber membrane is 2-20 g / m 2 ; the diameter morphology of the nanofibers is controlled to obtain nanofibers with a diameter of 200 nm to 3 μm.

5. The preparation method of the anti-aging fluorine-free waterproof sound-permeable film according to claim 3, wherein, In step S2, a continuous and uniform nanofiber membrane with a width of up to 1 m is obtained by controlling the swing amplitude and swing speed of the array needle head system of each module.

6. The preparation method of the anti-aging fluorine-free waterproof and sound-permeable film according to claim 3, characterized in that, The voltage of the electrospinning device is 50 kV - 70 kV, and the receiving distance is 20 cm - 40 cm.

7. The preparation method of the anti-aging fluorine-free waterproof and sound-permeable film according to claim 3, wherein, In step S4, the adjusted temperature is , the lamination time is 2 s to 90 s, the pressure is 0.05 to 0.5 MPa, and the lamination gap is 0.1 mm to 0.5 mm.

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