Continuous hydrophilic modification equipment for PTFE microporous membrane

Abstract

The application discloses a kind of PTFE microporous membrane continuous hydrophilic modification equipment, including wire laying device, hydrophilic modification high-pressure jet device, heat treatment device, jet cleaning device, hot air drying device and winding device;Hydrophilic modification high-pressure jet device includes jet pipeline for membrane wire continuous passing, and modification solution high speed penetrates PTFE microporous membrane surface into PTFE microporous during the process that membrane wire passes jet pipeline;Heat treatment device heats the membrane wire passing continuously, to be anchored in PTFE microporous membrane by heat crosslinking in the polar hydrophilic group in modification solution;Jet cleaning device washes out monomer that is not completely reacted in heat treatment process;Hot air drying device is dried to membrane wire after cleaning by hot air.The application uses high-pressure jet modification technology, makes the PTFE hollow fiber membrane wire prepared with permanent hydrophilicity, coating is firm;And realize equipment integration, synchronous online continuous production.

Description

[Technical Field]

[0001] This invention belongs to the field of PTFE technology, specifically relating to the hydrophilic modification technology of PTFE microporous membranes. [Background Technology]

[0002] PTFE is a completely symmetrical, unbranched linear polymer. The entire PTFE molecule contains only two types of atoms: C and F. The CF2 group runs along the polymer chain. The F atom has a small radius and is tightly connected to the backbone carbon atoms. This causes the orientation of adjacent CF2 units to not be completely cross-shaped, but to form a twisted chain with a helical shape. Therefore, it is highly crystalline with a crystallinity greater than 92%. It has excellent resistance to strong acids and alkalis and exhibits superior performance in water treatment and material separation.

[0003] However, PTFE itself is a superhydrophobic material, and microporous membranes made of PTFE cannot be directly applied in the field of water treatment. The membrane fibers need to be modified to be hydrophilic.

[0004] PTFE modification methods include sodium naphthalene solution method, plasma treatment, surface hydrophilic coating crosslinking, and filling mixing method. Currently, microporous membranes mainly adopt the surface modification method, which often uses surfactants and polyol polymer solutions for soaking to impart polar groups to the surface. The production process involves soaking the membrane fibers in a hydrophilic solution of a certain concentration for several hours, and then taking the membrane fibers out and transferring them to an oven for drying to obtain hydrophilic modified PTFE hollow fiber membranes.

[0005] Because the process involves soaking the membrane fibers in solvent, when the amount of soaked membrane fibers is large, the concentration difference between the inner and outer walls of the membrane fibers and the inner and outer edges of the membrane fibers leads to uneven hydrophilicity. Furthermore, the hydrophilic polymer and the membrane fibers are only adsorbed by hydrogen bonds. Due to the high electronegativity of the F atoms, the binding force between the two is weak. During the later stages of use, the hydrophilic agent will be gradually lost, eventually resulting in the loss of water production capacity.

[0006] In addition, the production process is complicated. First, the PTFE hollow fiber membrane is cut to a certain length, usually 3-5m, and then tied before it can be soaked in a hydrophilic solvent. After soaking, it is transferred to an oven for drying. Since the drying heat treatment temperature is usually controlled above 100℃, the volatilization of organic solvents and small molecule organic matter in the modification solution causes the PTFE microporous fibers to shrink. The surface of the dried PTFE hollow fiber membrane is severely distorted, and the membrane fibers are of different lengths, which causes great waste in the subsequent casting and end-sealing process.

[0007] The above process is discontinuous, involves complicated steps, is inefficient, occupies multiple spaces, and is not conducive to industrial production. [Summary of the Invention]

[0008] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a continuous hydrophilic modification device for PTFE microporous membranes, which improves efficiency and facilitates industrial production.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] A continuous hydrophilic modification device for PTFE microporous membranes includes a fiber feeding device, a hydrophilic modification high-pressure jet device, a heat treatment device, a jet cleaning device, a hot air drying device, and a winding device.

[0011] The fiber feeding device continuously feeds out membrane fibers, and the winding device continuously winds up the membrane fibers, so that the membrane fibers pass through the hydrophilic modified high-pressure jet device, the heat treatment device, the jet cleaning device and the hot air drying device in sequence.

[0012] The hydrophilic modification high-pressure jet device includes a jet pipe for continuous passage of membrane filaments. One end of the jet pipe is provided with a membrane filament inlet and the other end is provided with a membrane filament outlet. The jet pipe is provided with a high-pressure jet nozzle for spraying the modification solution onto the membrane filaments. During the process of the membrane filaments passing through the jet pipe, the modification solution penetrates the surface of the PTFE microporous membrane at high speed and enters the PTFE micropores.

[0013] The heat treatment device heats the continuously passing membrane fibers to anchor the polar hydrophilic groups in the modified solution onto the PTFE microporous membrane through thermal crosslinking.

[0014] The jet cleaning device washes out monomers that were not fully reacted during the heat treatment process.

[0015] The hot air drying device dries the cleaned membrane fibers with hot air.

[0016] Preferably, the jet conduit includes an outer tube and a central inner tube disposed within the outer tube, the high-pressure jet port is disposed on the central inner tube, a solution cavity is provided between the outer tube and the central inner tube, and the outer tube is provided with a solution inlet communicating with the solution cavity.

[0017] Preferably, a sealing spacer is provided between the ends of the outer tube and the central inner tube; and / or, the solution inlet is located at the axial middle position of the outer tube.

[0018] Preferably, the membrane filament inlet has a tapered opening, and the diameter of the tapered opening gradually increases from the end towards the axial inward side.

[0019] Preferably, the membrane fiber outlet has a solution outlet in the radial direction.

[0020] Preferably, the hydrophilic modified high-pressure jet device is further provided with a modified polymer cooling assembly, which includes a modified solution storage tank for recovering the modified solution and an ice-water bath cooling container for cooling the modified solution storage tank. The modified solution storage tank is connected to the solution outlet through a recovery pipe.

[0021] Preferably, the solution inlet is connected to a first booster pump for pumping the modified solution, and the first booster pump is connected to the modified solution storage tank.

[0022] Preferably, the jet cleaning device includes a jet pipe through which the membrane filaments pass continuously, one end of the jet pipe is provided with a membrane filament inlet and the other end is provided with a membrane filament outlet, and the jet pipe is provided with a high-pressure jet nozzle for spraying a cleaning aqueous solution onto the membrane filaments.

[0023] Preferably, the jet cleaning device further includes a cleaning water tank and a second booster pump, the second booster pump being connected to the cleaning water tank and the jet pipe to pump the cleaning solution in the cleaning water tank to the jet pipe.

[0024] Preferably, both the heat treatment device and the hot air drying device are equipped with a hot air drying chamber and a blower. The hot air drying chamber is equipped with a hot air inlet and a hot air outlet. The hot air inlet is connected to the blower outlet through an air inlet pipe, and the hot air outlet is connected to the blower inlet through an air outlet pipe.

[0025] The present invention adopts the above-mentioned technical solution, wherein the filament feeding device continuously feeds out membrane filaments and the winding device continuously winds up the membrane filaments, so that the fed membrane filaments continuously pass through the hydrophilic modification high-pressure jet device, the heat treatment device, the jet cleaning device and the hot air drying device.

[0026] The hydrophilic modification high-pressure jet device employs high-pressure jet modification technology. As the membrane fibers pass through the jet channel of the device, a hydrophilic modification solution is sprayed onto them through a high-pressure nozzle. Without damaging the PTFE microporous structure, the hydrophilic modification solution penetrates the PTFE surface at high speed, pressing the modified material into the PTFE micropores. The membrane fibers are then heated by a heat treatment device, and thermal crosslinking firmly anchors the polar hydrophilic groups onto the PTFE fiber membrane, thus modifying the PTFE hollow fiber membrane. Next, a jet cleaning device washes away any unreacted monomers from the heat treatment process, and a hot air drying device dries the cleaned membrane fibers with hot air. Finally, the membrane fibers are wound up, achieving continuous modification of the membrane fibers.

[0027] Therefore, it has the following beneficial effects:

[0028] High-pressure jet modification technology is used to give the prepared PTFE hollow fiber membrane fibers permanent hydrophilicity and a strong coating.

[0029] The unwinding device, hydrophilic modification high-pressure jet device, heat treatment device, jet cleaning device, hot air drying device, and winding device are continuously set along the direction of the film filaments, realizing integrated equipment, synchronous online continuous production, ensuring product stability, and the production process is simple, energy-saving, time-saving, and labor-saving, greatly improving production efficiency and reducing modification costs.

[0030] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0031] The invention will be further described below with reference to the accompanying drawings:

[0032] Figure 1 Schematic diagram of the structure of a continuous hydrophilic modification device for PTFE microporous membranes Figure 1 ;

[0033] Figure 2 Schematic diagram of the structure of a continuous hydrophilic modification device for PTFE microporous membranes Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the structure of a hydrophilic modified high-pressure jet device;

[0035] Figure 4 This is a schematic diagram of the structure of the high-pressure injection device mounting bracket;

[0036] Reference numerals: membrane fiber 100, fiber feeding device 101, winding device 102, hydrophilic modified high-pressure jet device 1, outer sleeve 11, solution inlet 111, fixing plate 112, sealing septum 113, central inner tube 12, high-pressure jet nozzle 121, membrane fiber inlet 13, conical nozzle 131, flange 132, membrane fiber outlet 14, solution outlet 141, fixing frame 15, fixing support 151, adjusting screw 152, fixing clamp 153, modified solution storage tank 16, ice water bath cooling container 17, first booster pump 18, heat treatment device 2, hot air drying oven 21, blower 22, jet cleaning device 3, cleaning water tank 31, second booster pump 32, hot air drying device 4.

Detailed Implementation Methods

[0037] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0038] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0039] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "inner," and "outer" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] Reference Figures 1 to 4 As shown, a continuous hydrophilic modification device for PTFE microporous membranes includes a fiber feeding device 101, a hydrophilic modification high-pressure jet device 1, a heat treatment device 2, a jet cleaning device 3, a hot air drying device 4, and a winding device 102. The fiber feeding device 101 continuously feeds out membrane fibers 100, and the winding device 102 continuously winds up the membrane fibers 100, so that the fed membrane fibers 100 sequentially pass through the hydrophilic modification high-pressure jet device 1, the heat treatment device 2, the jet cleaning device 3, and the hot air drying device 4.

[0043] The unwinding and winding devices can employ a multi-roller structure, with one main roll for unwinding or winding the film filaments, and several guide rolls (e.g.) Figure 2 The diagram shows three guide rollers guiding the film filaments. The unwinding and winding devices operate at the same speed, with the winding speed slightly exceeding the unwinding speed of the unwinding device.

[0044] like Figure 3As shown, in this embodiment, the hydrophilic modification high-pressure jet device 1 includes a jet pipe through which the membrane filaments pass continuously. The jet pipe extends axially and its length can vary. It is usually placed horizontally. One end of the jet pipe is provided with a membrane filament inlet 13 and the other end is provided with a membrane filament outlet 14. The jet pipe is provided with a high-pressure jet nozzle 121 for spraying the modification solution onto the membrane filaments 100. During the process of the membrane filaments 100 passing through the jet pipe, the modification solution penetrates the PTFE surface at high speed and presses the modified material into the PTFE micropores.

[0045] Furthermore, the heat treatment device 2 heats the continuously passing membrane fibers to anchor the polar hydrophilic groups in the modification solution onto the PTFE microporous membrane through thermal crosslinking. The jet cleaning device 3 washes out monomers that have not fully reacted during the heat treatment process. The hot air drying device 4 dries the cleaned membrane fibers with hot air. Finally, the dried membrane fibers are wound up, achieving continuous modification of the membrane fibers.

[0046] In one embodiment, the jet conduit includes an outer sleeve 11 and a central inner tube 12 fixed within the outer sleeve. A high-pressure injection port 121 is located on the central inner tube. A solution cavity is provided between the outer sleeve 11 and the central inner tube 12. The outer sleeve 11 has a solution inlet 111 communicating with the solution cavity. The modified solution entering through the solution inlet 111 fills the solution cavity. Further pressurization of the modified solution via a booster pump from the solution inlet 111 causes the modified solution within the solution cavity to be ejected from the high-pressure injection port 121.

[0047] To form a solution cavity, a sealing spacer 113 is provided between the ends of the outer tube 11 and the central inner tube 12. The outer tube, the central inner tube, and the sealing spacer are made of stainless steel. Specifically, the sealing spacer 113 is welded to the outer tube 11, a sealing ring is provided between the sealing spacer 113 and the central inner tube 12, and a sealing ring is provided between the outer tube 11 and the membrane fiber inlet 13 and the membrane fiber outlet 14, thereby sealing both ends of the cavity.

[0048] In this embodiment, the solution inlet 111 is located at the axial middle position of the outer sleeve 11, so that the modified solution entering from the solution inlet 111 can flow evenly to both sides of the solution cavity.

[0049] like Figure 3As shown, the membrane fiber inlet 13 has a tapered opening 131, and the diameter of the tapered opening gradually increases from the end towards the axial inward side. Its end inner diameter is slightly larger than the membrane fiber diameter to prevent high-pressure water from overflowing from the membrane fiber inlet. Generally, the end diameter of the tapered opening is 4-10 mm, and the inner diameter of the tapered opening is smaller than the inner diameter of the central inner tube. The membrane fiber outlet has a radially arranged solution outlet 141. The membrane fiber is fed out from the end opening of the membrane fiber outlet, and its end opening is perpendicular to the axial direction of the solution outlet 141. The solution outlet 141 is a straight tube and is welded and fixed to the main body of the solution outlet.

[0050] Furthermore, the hydrophilic modified high-pressure jet device 1 is also equipped with a modified polymer cooling assembly. This assembly includes a modified solution storage tank 16 for recovering the modified solution and an ice-water bath cooling container 17 for cooling the modified solution storage tank. The modified solution storage tank is connected to the solution outlet via a recovery pipe. Within the ice-water bath cooling container 17, the modified solution storage tank 16 can cool and lower the temperature of the recovered modified solution, maintaining it at a suitable temperature to ensure the modification effect. The solution inlet 111 is connected to a first booster pump 18 for pumping the modified solution. The first booster pump 18 is connected to the modified solution storage tank 16, cooling the modified solution before sending it into the solution inlet, thus realizing the recovery and reuse of the modified solution.

[0051] The membrane fibers continuously pass through the jet pipe. It is understood that several groups of high-pressure jet nozzles are evenly spaced along the axial direction of the jet pipe. The specific spacing is designed according to needs to ensure that the modified solution is sprayed onto the membrane fibers throughout their passage through the jet pipe. Each group of high-pressure jet nozzles is evenly spaced circumferentially, and can consist of two, three, or more nozzles, ensuring that the modified solution is sprayed onto the membrane fibers in the circumferential direction. This improves modification efficiency and enhances the modification effect. The length of the jet pipe is designed to be 1000-5000 mm, the number of high-pressure jet nozzles is 60-200, and the diameter of the high-pressure jet nozzles is 0.5-1 mm, preferably 0.6-1 mm. Furthermore, the distance between the outer tube 11 and the central inner tube 12 is 3-6 mm, the wall thickness of the central inner tube is 2-5 mm, preferably 2-3 mm, and the distance between the central inner tube 12 and the membrane fibers 100 is 4-12 mm.

[0052] To secure the membrane fiber inlet and outlet, the membrane fiber inlet 13 and membrane fiber outlet 14 are provided with flange portions 132. Each flange portion 132 includes an inner radial section, an axial section connected to the outer end of the inner radial section and extending axially inward into the jet pipe, and an outer radial section connected to the end of the axial section and extending radially outward. A fixing plate 112 is fixed to the radially outer end of the outer sleeve 11, and the outer radial section is bolted to the fixing plate 112.

[0053] refer to Figure 4As shown, a fixed frame 15 is provided below the jet pipe, and the jet pipe is installed on the fixed frame 15. The fixed frame 15 includes a fixed support 151, an adjusting screw 152, and a fixing clamp 153. The adjusting screw can extend and retract along the fixed support 151. A locking nut is provided on the fixed support, and the adjusting screw is locked by the locking nut. The fixing clamp 153 is engaged with the jet pipe and fixed with bolts. Therefore, the height of the jet pipe can be adjusted by extending and retracting the adjusting screw.

[0054] refer to Figure 2 As shown, the jet cleaning device 3 has the same structure as the hydrophilic modified high-pressure jet device 1. The modified solution is replaced by a cleaning aqueous solution, the modified solution storage tank is replaced by a cleaning water tank 31, and the first booster pump is replaced by a second booster pump 32. The second booster pump 32 connects the cleaning water tank 31 and the jet pipe to pump the cleaning aqueous solution from the cleaning water tank to the jet pipe.

[0055] like Figure 2 As shown, both the heat treatment device 2 and the hot air drying device 4 are equipped with a hot air drying chamber 21 and a blower 22. The hot air drying chamber 21 has a hot air inlet and a hot air outlet. The hot air inlet is connected to the blower outlet through an air inlet pipe, and the hot air outlet is connected to the blower inlet through an air outlet pipe. In this way, the blower 22 sends hot air into the hot air drying chamber 21, and the recovered hot air re-enters the blower 22 and is sent back into the hot air drying chamber 21. A heater can be installed at the hot air outlet to maintain the temperature blown into the hot air drying chamber 21 at a set temperature. This allows for the recycling of hot air, achieving energy savings.

[0056] The materials used in the modified solution are based on existing technologies, including polyacrylic acid (PAA) and triethanolamine (TEOA). Polyacrylic acid (PAA) is a monomer with a high charge density and rich in carboxyl groups; triethanolamine (TEOA) is an environmentally friendly, affordable, and readily available reactive monomer. Its polyhydroxy structure reacts with carboxyl groups to crosslink and form a network structure, resulting in excellent film-forming mechanical properties.

[0057] Using the aforementioned PTFE microporous membrane continuous hydrophilic modification equipment, a corresponding PTFE microporous membrane continuous hydrophilic modification process was designed:

[0058] a. First, prepare a 1%-15% hydrochloric acid ethanol solution for later use;

[0059] b. Dissolve a certain amount of PAA in 95-97% anhydrous ethanol, slowly add the hydrochloric acid ethanol solution prepared in step a, and stir to adjust the pH to 2-4, preferably 2.1-2.5;

[0060] c. Add TEOA dropwise to the solution prepared in step b, with a mass ratio of TEOA:PAA:ETOH of 2:1:17 and stir for 15-30 minutes;

[0061] d. Configure the PAA-TEOA-H + The solution is transferred to an ice-water cooling bath to cool down, with the temperature controlled at <3℃, preferably <1℃, and kept stable for more than 30 minutes;

[0062] e. The PTFE hollow fiber membrane is passed through a PTFE microporous membrane continuous hydrophilic modification device, and the hydrophilic modification high-pressure jet device uses the modification solution prepared in step d to perform hydrophilic modification on the PTFE hollow fiber membrane.

[0063] Finally, the modified PTFE hollow fiber membrane is obtained by winding.

[0064] In the above process, the hydroxyl groups in TEOA can undergo esterification and crosslinking with the carboxyl groups on PAA. By adjusting the pH of the solution, the tertiary amino groups in the TEOA molecules are converted into quaternary ammonium groups, thereby improving the hydrophilicity of the membrane.

[0065] The unwinding device continuously unwinds the membrane filaments, and the winding device continuously winds them up, setting the membrane filament traction speed at 3-6 m / min and maintaining the winding speed at 1.1-1.2 times the unwinding speed.

[0066] The process parameters of the jet pipe in the hydrophilic modified high-pressure jet device are as follows:

[0067] a. High-pressure jet pressure: 0.3-5 MPa;

[0068] b. Jet impact force: 50-120N;

[0069] c. Jet velocity: 0.1-0.3 m / s;

[0070] d. Specific gravity of the jet medium: 0.8-1.2;

[0071] e. Flow velocity coefficient 0.1-0.12.

[0072] By controlling the jet process parameters, the modified solution penetrates the PTFE surface at high speed and presses the modified material into the PTFE micropores without damaging the PTFE microporous structure, i.e. without destroying the membrane pore structure.

[0073] In the first booster pump, the motor drives the first booster pump, and the motor speed is controlled by frequency modulation to make the jet pressure reach 0.3-5MPa, preferably 0.3-1MPa.

[0074] The heat treatment apparatus controls the heat treatment temperature to 80-150℃ and the time to 20s-40s. By controlling the rearrangement of polymer chain segments through appropriate heat treatment temperature and time, a separation layer with a uniform and dense three-dimensional network structure is obtained through crosslinking.

[0075] The hot air drying device has a hot drying temperature of 150-275℃.

[0076] In the above process, the materials are environmentally friendly and readily available, and the modification process generates almost no waste liquid.

[0077] Specific examples of continuous hydrophilic modification processes for PTFE microporous membranes:

[0078] The following are the parameters of the high-pressure sprayer device: nozzle diameter 1mm, number of spray holes 180, jet pressure: 0.5MPa;

[0079]

[0080] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Those skilled in the art should understand that the invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A continuous hydrophilic modification apparatus of a PTFE microporous membrane, characterized by: The device comprises a yarn releasing device, a hydrophilic modification high-pressure jet device, a heat treatment device, a jet cleaning device, a hot air drying device and a winding device. The yarn releasing device continuously releases the film yarn, and the winding device continuously winds the film yarn, so that the film yarn sequentially passes through the hydrophilic modification high-pressure jet device, the heat treatment device, the jet cleaning device and the hot air drying device. The hydrophilic modification high-pressure jet device comprises a jet pipeline through which the film yarn continuously passes, the jet pipeline comprises an outer sleeve and a central inner tube arranged in the outer sleeve, a solution cavity is arranged between the outer sleeve and the central inner tube, the outer sleeve is provided with a solution inlet communicating with the solution cavity, one end of the jet pipeline is provided with a film yarn inlet, and the other end is provided with a film yarn outlet, the central inner tube is provided with a high-pressure jet port for jetting a modification solution to the film yarn, and the modification solution penetrates the surface of the PTFE microporous membrane into the PTFE micropore at high speed during the process of the film yarn passing through the jet pipeline. The heat treatment device heats the continuously passing film yarn to anchor the polar hydrophilic groups in the modification solution on the PTFE microporous membrane through thermal crosslinking. The jet cleaning device washes out the monomers that do not completely react in the heat treatment process. The hot air drying device dries the cleaned film yarn through hot air.

2. The apparatus for continuous hydrophilic modification of a PTFE microporous membrane according to claim 1, wherein A sealing spacer is arranged between the end portions of the outer sleeve and the central inner tube; and / or, the solution inlet is arranged at the axial middle position of the outer sleeve.

3. The apparatus for continuous hydrophilic modification of PTFE microporous membrane according to claim 1, wherein The film yarn inlet is provided with a tapered port, and the diameter of the tapered port gradually increases from the end portion to the inner side of the axial direction.

4. The apparatus for continuous hydrophilic modification of PTFE microporous membrane according to claim 1, wherein A solution outlet is arranged in the radial direction of the film yarn outlet.

5. The apparatus for continuous hydrophilic modification of a PTFE microporous membrane according to claim 4, wherein The hydrophilic modification high-pressure jet device is further provided with a modified polymer cooling assembly, the modified polymer cooling assembly comprises a modified solution storage tank for recovering the modified solution and an ice water bath cooling container for cooling the modified solution storage tank, and the modified solution storage tank is connected with the solution outlet through a recovery pipe.

6. The apparatus for continuous hydrophilic modification of a PTFE microporous membrane according to claim 5, wherein The solution inlet is connected with a first booster pump for pumping the modified solution, and the first booster pump is connected with the modified solution storage tank.

7. The apparatus for continuous hydrophilic modification of PTFE microporous membrane according to claim 1, wherein The jet cleaning device comprises a jet pipeline through which the film yarn continuously passes, one end of the jet pipeline is provided with a film yarn inlet, and the other end is provided with a film yarn outlet, and the jet pipeline is provided with a high-pressure jet port for jetting a cleaning aqueous solution to the film yarn.

8. The apparatus for continuous hydrophilic modification of a PTFE microporous membrane according to claim 7, wherein The jet cleaning device further comprises a cleaning water tank and a second booster pump, the second booster pump connects the cleaning water tank and the jet pipeline to pump the cleaning aqueous solution in the cleaning water tank to the jet pipeline.

9. The apparatus for continuous hydrophilic modification of PTFE microporous membrane according to claim 1, wherein The heat treatment device and the hot air drying device are both provided with a hot blast drying box and a blower, the hot blast drying box is provided with a hot air inlet and a hot air outlet, the hot air inlet is connected with the outlet of the blower through an air inlet pipe, and the hot air outlet is connected with the air inlet of the blower through an air outlet pipe.

Images