An asymmetric structure ptf hollow fiber membrane manufacturing equipment and method

Abstract

The application discloses a kind of asymmetric structure PTFE hollow fiber membrane manufacturing equipment and method, one is set between PTFE hollow fiber membrane support layer unwinding device and wrapping device for PTFE hollow fiber membrane support layer for corona machine two, for PTFE hollow fiber membrane support layer is carried out corona treatment;Corona machine two is set for PTFE hollow fiber membrane wrapping belt corona treatment and PTFE hollow fiber membrane support layer is carried out secondary corona treatment corresponding wrapping device;In addition, corona machine three is set between wrapping device and sintering furnace, for PTFE hollow fiber membrane before sintering is carried out corona treatment.The application is treated by corona to PTFE hollow fiber membrane, improve the adhesion between PTFE middle fiber membrane support layer and flat membrane (wrapping belt) two, so that PTFE hollow fiber membrane wrapping belt and PTFE hollow fiber membrane support layer can be firmly hot covering combined as a whole.

Description

[Technical Field]

[0001] This invention belongs to the field of hollow fiber membrane manufacturing technology, specifically relating to a technology for preparing asymmetric PTFE hollow fiber membranes. [Background Technology]

[0002] PTFE membrane fibers possess exceptional chemical stability, exhibiting strong resistance to acids, alkalis, and organic solvents. They can treat certain specialized industrial wastewaters without altering their properties. The high mechanical strength of PTFE fiber membranes means that even after repeated rinsing and backwashing, fiber breakage is minimal, and the membrane flux can recover to over 90% after cleaning. Furthermore, its high hydrophobicity gives it a strong affinity for most oily organic solvents, making it a preferred material for organic solvent filtration. Therefore, PTFE membrane fibers have broad application prospects.

[0003] Currently, commercial PTFE microporous membranes are mainly prepared by thermomechanical stretching. However, for uniaxially stretched hollow fiber membranes, since only longitudinal stretching can be performed, it can only promote longitudinal splitting of nodes and monotonous elongation of longitudinal fibrils. The pore size and porosity of the hollow fiber membrane cannot reach the ideal state at the same time. That is, if the membrane pore size is small, the stretching ratio during the membrane formation process is low, resulting in low porosity of the finished hollow fiber membrane. On the other hand, increasing the stretching ratio will lead to an excessively large membrane pore size, which reduces the retention accuracy.

[0004] For biaxially stretched flat sheet membranes, longitudinal stretching can form fibrils and nodes. Subsequent transverse stretching can effectively promote the transverse splitting of previous nodes to form new fibrils, as well as the tilting of previous fibrils, forming a microstructure of fibril cross-coverage. Therefore, the size of micropores and porosity can be controlled simultaneously through biaxial stretching.

[0005] To address the challenge of simultaneously controlling pore size and porosity in uniaxial stretching and achieve high-performance hollow fiber membranes, existing technologies employ a method of using hollow fiber preforms as supports and wrapping a flat sheet membrane around the outer surface, followed by high-temperature sintering to achieve a tight composite structure, thus preparing asymmetric hollow fiber membranes.

[0006] Chinese invention patent application CN201110153322.6 discloses a polytetrafluoroethylene hollow fiber membrane and its preparation method. The method uses a PTFE hollow fiber membrane (pore size range 0.5-2 μm) as the base membrane, wraps at least one layer of PTFE flat sheet membrane (pore size 0.02-0.5 μm, thickness 5-100 μm) around its outer ring wall, and wraps the microporous PTFE membrane with an impregnated polytetrafluoroethylene propylene (FEP) aqueous dispersion with a solid content of 10-50%. High-temperature sintering yields a polytetrafluoroethylene hollow fiber membrane with reduced filtration pore size, improved filtration accuracy, and advantages such as high porosity, high flux, and high strength.

[0007] Wang Junke et al. Preparation and structural characteristics of hollow polytetrafluoroethylene fiber membrane. International Textile Guide 2015, 10(10): 62-70: A wrapped tubular membrane was obtained by using a textile tube made of inorganic glass fiber fabric as the support layer, a strip of unsintered polytetrafluoroethylene membrane as the filter layer, and wrapping it around the outside of the support layer at a certain angle, and using a closed isocyanate as the crosslinking agent.

[0008] Wang Feng. Preparation and Separation Performance Study of Asymmetric PTFE Hollow Fiber Membranes [D]. Supervisor: Chen Jianyong; Guo Yuhai. Zhejiang Sci-Tech University, 2016. A flat sheet membrane (separation layer) was slit using a slitting machine. The width of the separation layer was controlled by adjusting the distance between adjacent cutters on the slitting machine. Then, a wrapping machine was used to spirally wind the separation layer of a certain width onto the outer surface of the hollow fiber membrane (support layer) at a certain angle. The wrapped separation membrane was then placed in an oven for bonding. Finally, the asymmetric hollow fiber membrane was obtained after heat setting at a certain temperature. This process involves heating to the melting point of PTFE and holding at that temperature, resulting in the thermal fusion of the outer layer and the support layer.

[0009] Guo Yuhai et al. A bonding method for polytetrafluoroethylene (PTFE) microporous materials: CN 102529291A. This invention mainly controls the oil content in the PTFE microporous material, achieving bonding between PTFE materials under certain temperature and pressure conditions. The bonding mechanism is due to the formation of a "fibril-node" microstructure in PTFE under external force and certain temperature, containing a lubricant (such as aviation kerosene) that promotes mutual penetration and fusion between PTFE materials, thus achieving bonding between PTFE materials without the use of any adhesive.

[0010] Huang Tianyu et al. A method for preparing polytetrafluoroethylene (PTFE)-coated hybrid hollow fiber membranes and tubular membranes: CN104415673A. Dispersed PTFE resin, polyvinylidene fluoride (PVDF) resin, and a liquid lubricant are mixed, and PTFE-coated hybrid hollow tube preforms are prepared through extrusion, stretching, and sintering processes. The surface of the tube preform is coated with a microporous flat sheet membrane, and then sintered to obtain the PTFE-coated hybrid hollow fiber membranes and tubular membranes. The added PVDF resin can increase the hardness of the hybrid hollow tube preform, preventing deformation of the preform due to tension during the coating process, and also acts as an adhesive after coating, enhancing the bonding strength.

[0011] Shen Liqiang et al. Preparation method of high-bonding-strength polytetrafluoroethylene hollow fiber membrane: CN109529639A. A fully sintered biaxially stretched polytetrafluoroethylene (PTFE) flat sheet membrane with an average pore size range of 0.05 μm-0.5 μm is cut into PTFE strip membranes. The PTFE strip membranes are impregnated in a low molecular weight PTFE organic dispersion. The impregnated PTFE strip membranes are wrapped around the outer wall of a stretched PTFE hollow fiber membrane with an average pore size range of 1 μm-5 μm, with 1-3 wrapping layers. The membrane is then heat-treated at 280℃-360℃ for 5-30 seconds to obtain a wrapped PTFE hollow fiber membrane. The PTFE strip membrane, serving as a separation layer, is then impregnated and wrapped around the outer wall of the stretched PTFE hollow fiber membrane, which serves as a support layer. The bond strength between the separation layer and the support layer is greater than 0.4 MPa.

[0012] The above methods result in poor adhesion when polytetrafluoroethylene (PTFE) is bonded to other materials due to its extremely strong chemical inertness and poor surface wetting properties. Only adhesive bonding, direct thermal lamination, or adhesive-heated lamination are used for bonding, and the adhesion strength between the flat film skin and the base film is usually not high.

[0013] The method of using crosslinking agents has the problem that certain types of crosslinking agents cannot simultaneously meet the requirements of acid and alkali resistance, oxidation resistance, and solvent resistance, which will directly affect the application fields of the membrane.

[0014] When polytetrafluoroethylene organic dispersions are used as adhesives, PTFE pore blockage can affect the original performance and increase unnecessary costs.

[0015] The simple thermal bonding method can reduce the bonding strength of PTFE microporous membranes due to their smooth surface and the presence of tiny particles in the environment. Furthermore, extending the thermal bonding time or increasing the thermal bonding temperature can cause the fibers inside the wrapped flat membrane to break, resulting in increased membrane pore size, reduced porosity, or even complete blockage of the membrane pores.

[0016] Therefore, to improve the adhesion between PTFE microporous membranes, methods such as naphthalene-sodium solution method, plasma method, and radiation method can be used.

[0017] However, in practice, the sodium naphthalene solution method is highly corrosive, toxic, and flammable, posing a significant risk to human health.

[0018] Plasma methods require specialized gases such as oxygen, nitrogen, and helium. To ensure gas purity, a vacuum process is required beforehand. In actual use, the efficiency is low, the equipment investment is large, and there are also significant safety hazards.

[0019] Radiation methods are highly effective, but because they involve the use of radiation, they pose significant risks to human safety and may also cause substantial damage to the strength of materials. [Summary of the Invention]

[0020] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide an asymmetric PTFE hollow fiber membrane preparation device and method, which enables the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer to be firmly thermally bonded together, and can shorten the thermal bonding time and reduce the thermal bonding temperature, thereby avoiding damage to the PTFE hollow fiber membrane pores.

[0021] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0022] On one hand, an asymmetric PTFE hollow fiber membrane manufacturing device is provided, which wraps PTFE hollow fiber membrane with wrapping tape around a PTFE hollow fiber membrane support layer. The device includes a PTFE hollow fiber membrane support layer unwinding device, a PTFE hollow fiber membrane wrapping tape unwinding device, a wrapping device, a sintering furnace, and a winding device. The PTFE hollow fiber membrane support layer unwinding device and the PTFE hollow fiber membrane wrapping tape unwinding device respectively unwind the PTFE hollow fiber membrane support layer and the PTFE hollow fiber membrane wrapping tape. The wrapping device wraps the PTFE hollow fiber membrane wrapping tape around the PTFE hollow fiber membrane support layer to form a wrapped PTFE hollow fiber membrane. The sintering furnace then wraps the wrapped PTFE hollow fiber membrane... The PTFE hollow fiber membrane is heated to thermally bond the PTFE hollow fiber membrane wrapping tape to the PTFE hollow fiber membrane support layer. The winding device is used to wind up the formed PTFE hollow fiber membrane. The PTFE hollow fiber membrane manufacturing equipment also includes three corona treatment machines: a corona treatment machine 1, a corona treatment machine 2, and a corona treatment machine 3. The corona treatment machine 1 is located between the PTFE hollow fiber membrane support layer unwinding device and the wrapping device, and is used to perform corona treatment on the PTFE hollow fiber membrane support layer. The corona treatment machine 2 is located opposite the wrapping device and is used to perform corona treatment on the PTFE hollow fiber membrane wrapping tape and a secondary corona treatment on the PTFE hollow fiber membrane support layer. The corona treatment machine 3 is located between the wrapping device and the sintering furnace, and is used to perform corona treatment on the PTFE hollow fiber membrane before sintering.

[0023] Preferably, the electrodes of the first and second corona machines are irradiated at 180° intervals around the PTFE hollow fiber membrane support layer.

[0024] Preferably, the length of the corona machine is 20-200cm, and the distance from the electrode to the fiber membrane is 1-3cm.

[0025] Preferably, the length of the sintering furnace is 1-3m.

[0026] On the other hand, a manufacturing process for an asymmetric PTFE hollow fiber membrane is provided, wherein the PTFE hollow fiber membrane manufacturing equipment described above is used to manufacture the asymmetric PTFE hollow fiber membrane.

[0027] The PTFE hollow fiber membrane support layer passes sequentially through corona machine one, corona machine two, corona machine three and PTFE sintering furnace; the PTFE hollow fiber membrane wrapping tape is wrapped around the PTFE hollow fiber membrane support layer by a wrapping device, and during the wrapping process, the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer are corona treated by corona machine two.

[0028] The corona machine performs corona treatment on the PTFE hollow fiber membranes before sintering.

[0029] Preferably, the corona power is controlled at 1KW-10kW.

[0030] Preferably, the corona power of the first corona machine, the second corona machine, and the third corona machine increases sequentially.

[0031] Preferably, the sintering temperature of the sintering furnace is 327-390℃.

[0032] Preferably, the speed of the PTFE hollow fiber membrane is controlled to be 1-12 m / min by means of a PTFE hollow fiber membrane wrapping tape unwinding device, a PTFE hollow fiber membrane wrapping tape unwinding device, a wrapping device, and a winding device.

[0033] The technical solution adopted in this invention has the following technical effects:

[0034] Corona treatment, a type of plasma treatment, involves applying a high-frequency voltage to a discharge electrode. The high voltage ionizes the air between the electrodes, generating a large amount of plasma gas and ozone. When PTFE fibers pass between the electrodes, they interact with the insulating PTFE surface molecules, causing polar groups to form on the surface molecular chains. This increases the surface tension and surface energy of the PTFE fibers, cleans the PTFE surface, and increases its roughness. It also improves the adhesion between the PTFE fiber membrane support layer and the flat sheet membrane (wrapping tape). Furthermore, through subsequent thermal lamination, the bonding force between the PTFE microporous membrane support layer and the flat sheet membrane is greatly increased, allowing the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer to be firmly thermally bonded together.

[0035] Because corona treatment increases the adhesion between the PTFE microporous membrane support layer and the flat sheet membrane, it can shorten the thermal lamination time and reduce the thermal lamination temperature to a certain extent, thereby avoiding damage to the pores of the PTFE hollow fiber membrane during the thermal lamination process.

[0036] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0037] The invention will be further described below with reference to the accompanying drawings:

[0038] Figure 1 This is a schematic diagram of a device for manufacturing an asymmetric PTFE hollow fiber membrane.

[0039] Figure reference numerals: 100-PTF hollow fiber membrane support layer, 200-PTFE hollow fiber membrane wrapping tape, 11-corona machine one, 12-corona machine two, 13-corona machine three, 2-sintering furnace.

Detailed Implementation Methods

[0040] 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.

[0041] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0042] Example 1

[0043] Reference Figure 1 As shown, an asymmetric PTFE hollow fiber membrane manufacturing device is used to wrap a PTFE hollow fiber membrane wrapping tape 200 around a PTFE hollow fiber membrane support layer 100. The PTFE hollow fiber membrane manufacturing device includes a PTFE hollow fiber membrane support layer unwinding device, a PTFE hollow fiber membrane wrapping tape unwinding device, a wrapping device, a sintering furnace 2, and a winding device. The PTFE hollow fiber membrane support layer unwinding device and the PTFE hollow fiber membrane wrapping tape unwinding device respectively unwind the PTFE hollow fiber membrane support layer and the PTFE hollow fiber membrane wrapping tape. The wrapping device wraps the PTFE hollow fiber membrane wrapping tape around the PTFE hollow fiber membrane support layer to form a wrapped PTFE hollow fiber membrane. The sintering furnace heats the wrapped PTFE hollow fiber membrane to thermally bond the PTFE hollow fiber membrane wrapping tape to the PTFE hollow fiber membrane support layer. The winding device is used to wind up the formed PTFE hollow fiber membrane.

[0044] To ensure a firm thermal bonding between the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer, this embodiment employs a corona treatment machine to corona treat the PTFE hollow fiber membrane. Specifically, the PTFE hollow fiber membrane manufacturing equipment further includes corona treatment machine 11, corona treatment machine 212, and corona treatment machine 313. Corona treatment machine 11 is located between the PTFE hollow fiber membrane support layer unwinding device and the wrapping device, and is used to corona treat the PTFE hollow fiber membrane support layer. Corona treatment machine 212 is positioned corresponding to the wrapping device and is used to corona treat the PTFE hollow fiber membrane wrapping tape and perform a secondary corona treatment on the PTFE hollow fiber membrane support layer, i.e., corona treatment is performed simultaneously with wrapping. Corona treatment machine 313 is located between the wrapping device and the sintering furnace, and is used to corona treat the PTFE hollow fiber membrane before sintering.

[0045] The first corona treatment roughens the surface of the PTFE hollow fiber membrane support layer, increasing its surface energy and eliminating surface particulate impurities, thus facilitating adhesion to the PTFE hollow fiber membrane wrapping tape. The second corona treatment significantly enhances the bonding strength of the PTFE hollow fiber membrane wrapping tape and applies a second-stage corona treatment to the PTFE hollow fiber membrane support layer (180° opposite to the discharge electrode of the first corona treatment) to ensure uniform corona treatment. The third corona treatment also increases the surface energy of the PTFE hollow fiber membrane wrapping tape, eliminates surface particulate impurities, and further enhances the bonding strength between the two.

[0046] Corona treatment, a type of plasma treatment, involves applying a high-frequency voltage to a discharge electrode. The high voltage ionizes the air between the electrodes, generating a large amount of plasma gas and ozone. When PTFE fibers pass between the electrodes, they interact with the insulating PTFE surface molecules, causing polar groups to form on the surface molecular chains. This increases the surface tension and surface energy of the PTFE fibers, cleans the PTFE surface, and increases its roughness. It also improves the adhesion between the PTFE fiber membrane support layer and the flat sheet membrane (wrapping tape). Furthermore, through subsequent thermal lamination, the bonding force between the PTFE microporous membrane support layer and the flat sheet membrane is greatly increased, allowing the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer to be firmly thermally bonded together.

[0047] Because corona treatment increases the adhesion between the PTFE microporous membrane support layer and the flat sheet membrane, it can shorten the thermal lamination time and reduce the thermal lamination temperature to a certain extent, thereby avoiding damage to the pores of the PTFE hollow fiber membrane during the thermal lamination process.

[0048] Corona treatment has advantages such as short processing time, fast processing speed, simple operation, and easy control. However, because corona treatment is a type of streamer discharge, its discharge pattern is filamentary discharge, meaning the discharge on the wire surface is uneven point discharge, resulting in uneven treatment effects. To solve the problem of uniformity in corona treatment, a two-stage corona treatment is used to ensure 360-degree full corona treatment of the fiber membrane. The electrodes of the first and second corona treatment machines are irradiated at 180° intervals around the PTFE hollow fiber membrane support layer. The machine length is 20-200cm, and the distance from the electrode to the fiber membrane is 1-3cm, preferably 2cm, to maximize the uniformity of corona treatment.

[0049] Preferably, the corona power is controlled between 1KW and 10kW. The corona power of corona machine one, corona machine two, and corona machine three increases sequentially. The corona power needs to be reasonably adjusted according to the thickness of the wrapping tape and the outer diameter of the support layer. If the corona power is too low, the processing effect will be poor; if the power is too high (especially corona machine two and corona machine three), the wrapping tape will be broken down by high voltage, affecting the interception accuracy. Therefore, the normal power adjustment from high to low is: corona machine one is greater than corona machine two, and corona machine two is greater than or equal to corona machine three; the purpose is to process the support layer to have the maximum roughness and surface energy and remove surface impurities, and the wrapping tape (separation layer) has a surface energy comparable to the support layer, thereby improving the adhesion between the two (specific data are shown and proved in the examples in Table 1).

[0050] In addition, to shorten the thermal lamination time and lower the thermal lamination temperature, and to avoid damage to the pores of the PTFE hollow fiber membrane, the length of the sintering furnace is 1-3m, preferably 2m, the sintering temperature of the sintering furnace is 327-390℃, preferably 360℃, and the speed through the sintering furnace is 1-12m / min, preferably 6m / min. Normal sintering control of the furnace body temperature is maintained at 380-400℃; if the furnace body length is 2m and the traction speed is 3m / min, the holding sintering time in the furnace body is approximately 40s; at the same traction speed, if the sintering temperature is between 327-360℃, the bonding force between the asymmetric structure membrane support layer and the flat sheet membrane (wrapping tape) is very weak, typically with a bursting pressure <0.15MPa. Often, the furnace body needs to be lengthened 3-4 times to barely improve the bonding strength. When the furnace length remains constant, the sintering traction rate can only be 20-30% of that of high-temperature sintering. If the furnace length is increased, the number of heating wires will increase, leading to a significant increase in energy consumption. It will also cause uneven outer diameter of the fiber membrane (because the sintering temperature exceeds the melting point of PTFE, the stroke is longer and the time is extended, and the force transmission is uneven when the fiber membrane is wound up, which can easily cause the outer diameter of the fiber membrane to shrink and become uneven).

[0051] Example 2

[0052] A method for manufacturing an asymmetric PTFE hollow fiber membrane is disclosed. The asymmetric PTFE hollow fiber membrane is manufactured using the PTFE hollow fiber membrane manufacturing equipment described in Example 1. The PTFE hollow fiber membrane support layer sequentially passes through corona treatment machine one, corona treatment machine two, corona treatment machine three, and a PTFE sintering furnace. A PTFE hollow fiber membrane wrapping tape is wrapped around the PTFE hollow fiber membrane support layer using a wrapping device. During the wrapping process, both the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer are corona treated by corona treatment machine two. Corona treatment machine three performs corona treatment on the PTFE hollow fiber membrane before sintering.

[0053] Specifically, it includes the following steps.

[0054] 1) Start the sintering furnace, control the temperature at 327-390℃, and keep the furnace length at 1-3m;

[0055] 2) Pass the PTFE hollow fiber membrane support layer through corona treatment machine 1, corona treatment machine 2, corona treatment machine 3, and sintering furnace in sequence;

[0056] 3) Overlap the PTFE hollow fiber membrane wrapping tape onto the PTFE hollow fiber membrane support layer;

[0057] 4) Start corona machine one, corona machine two, and corona machine three, and control the corona power to 1KW-10kW;

[0058] 5) Start the unwinding and rewinding devices, and start the wrapping device;

[0059] 6) Control the speed to keep the hollow fiber membrane at a speed of 1-12 m / min and pass it through corona treatment, wrapping, re-corona treatment and sintering to obtain an asymmetric PTFE hollow fiber membrane.

[0060] The total length of the first and second corona generators was 35cm (i.e., electrode length); the distance from the electrode to the fiber membrane was 2cm; the processing temperature was room temperature (approximately 25℃); and the total length of the sintering furnace was 1.5m. By adjusting the corona power, winding and unwinding speed, and sintering temperature, the skin peel strength was tested to determine the optimal parameters. Specific examples are shown in Table 1.

[0061] Table 1: Parameter Table of Specific Examples of PTFE Hollow Fiber Membrane Manufacturing Methods

[0062]

[0063] As can be seen from the examples in Table 1, the peel strength of the skin layer is low, only 1.5N, without corona treatment. The corona treatment works by: corona discharge ionizing the air between the electrodes, forming a plasma region on the material surface, making the surface non-polar; and the ionization of air in the high-voltage electric field producing ozone, a strong oxidant that can immediately oxidize the surface molecules of the material, converting them from non-polar to polar, increasing the surface tension between the skin layer and the support layer. Furthermore, after electron impact, the material surface is roughened, increasing surface activity and improving the adhesion strength between the skin layers, resulting in a significant improvement in peel strength.

[0064] 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. An asymmetric PTFE hollow fiber membrane manufacturing apparatus, comprising a PTFE hollow fiber membrane wrapping tape wrapped around a PTFE hollow fiber membrane support layer, the apparatus including a PTFE hollow fiber membrane support layer unwinding device, a PTFE hollow fiber membrane wrapping tape unwinding device, a wrapping device, a sintering furnace, and a winding device, wherein the PTFE hollow fiber membrane support layer unwinding device and the PTFE hollow fiber membrane wrapping tape unwinding device respectively unwind the PTFE hollow fiber membrane support layer and the PTFE hollow fiber membrane wrapping tape, the wrapping device wrapping the PTFE hollow fiber membrane wrapping tape around the PTFE hollow fiber membrane support layer to form a wrapped PTFE hollow fiber membrane, the sintering furnace heating the wrapped PTFE hollow fiber membrane to thermally bond the PTFE hollow fiber membrane wrapping tape to the PTFE hollow fiber membrane support layer, and the winding device for winding the formed PTFE hollow fiber membrane, characterized in that: The PTFE hollow fiber membrane manufacturing equipment further includes corona treatment machine one, corona treatment machine two, and corona treatment machine three; corona treatment machine one is located between the PTFE hollow fiber membrane support layer unwinding device and the wrapping device, and is used to perform corona treatment on the PTFE hollow fiber membrane support layer; corona treatment machine two is located corresponding to the wrapping device, and is used to perform corona treatment on the PTFE hollow fiber membrane wrapping tape and to perform secondary corona treatment on the PTFE hollow fiber membrane support layer; corona treatment machine three is located between the wrapping device and the sintering furnace, and is used to perform corona treatment on the PTFE hollow fiber membrane before sintering.

2. The asymmetric PTFE hollow fiber membrane manufacturing equipment according to claim 1, characterized in that, The electrodes of the corona machine one and corona machine two are irradiated at 180° intervals around the PTFE hollow fiber membrane support layer.

3. The asymmetric PTFE hollow fiber membrane manufacturing equipment according to claim 1, characterized in that, The length of the corona machine is 20-200cm, and the distance from the electrode to the fiber membrane is 1-3cm.

4. The asymmetric PTFE hollow fiber membrane manufacturing equipment according to claim 1, characterized in that, The length of the sintering furnace is 1-3m.

5. A method for manufacturing an asymmetric PTFE hollow fiber membrane, characterized in that, Asymmetric PTFE hollow fiber membranes are manufactured using the PTFE hollow fiber membrane manufacturing equipment described in claim 1; The PTFE hollow fiber membrane support layer passes sequentially through corona machine one, corona machine two, corona machine three and PTFE sintering furnace; the PTFE hollow fiber membrane wrapping tape is wrapped around the PTFE hollow fiber membrane support layer by a wrapping device, and during the wrapping process, the PTFE hollow fiber membrane wrapping tape and the PTFE hollow fiber membrane support layer are corona treated by corona machine two. The corona machine performs corona treatment on the PTFE hollow fiber membranes before sintering.

6. The method for manufacturing an asymmetric PTFE hollow fiber membrane according to claim 5, characterized in that, Control the corona power from 1KW to 10kW.

7. The method for manufacturing an asymmetric PTFE hollow fiber membrane according to claim 6, characterized in that, The corona power of the corona machine 1, corona machine 2, and corona machine 3 increases sequentially.

8. The method for manufacturing an asymmetric PTFE hollow fiber membrane according to claim 5, characterized in that, The sintering temperature of the sintering furnace is 327-390℃.

9. The method for manufacturing an asymmetric PTFE hollow fiber membrane according to claim 5, characterized in that, The speed of the PTFE hollow fiber membrane is controlled to be 1-12 m / min by the coordinated use of the PTFE hollow fiber membrane wrapping tape unwinding device, PTFE hollow fiber membrane wrapping tape unwinding device, wrapping device, and winding device.

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