60 results about "Expanded polytetrafluoroethylene" patented technology

The invention relates to medical devices and methods of using them. The devices are prostheses which can be percutaneously deliverable with (or on) an endovascular catheter or via other surgical or other techniques and then expanded. The prostheses are configured to have a lattice resistant to dilation and creep, which is defined by a plurality of openings. The prosthesis may also optionally have a stent disposed proximal to the lattice. In exemplary embodiments, the fluoropolymer is expanded polytetrafluoroethylene. The composite materials exhibit high elongation while substantially retaining the strength properties of the fluoropolymer membrane. In at least one embodiment, the lattice is made of a composite material that includes a least one fluoropolymer membrane including serpentine fibrils and an elastomer. A lattice including a generally tubular member formed of a composite material including a least one fluoropolymer membrane containing serpentine fibrils and an elastomer is also provided.

The invention relates to a metal reinforced polytetrafluoroethylene film which comprises a first film layer, a second film layer and a metal support, the metal support is located between the first film layer and the second film layer, and the first film layer and the second film layer wrap the metal support; the first film layer and the second film layer are respectively and independently selected from micro-stretching expanded polytetrafluoroethylene with the stretching amplitude of about 20%-100%, and the micro-stretching expanded polytetrafluoroethylene has a microporous structure; the formed metal reinforced polytetrafluoroethylene film is provided with micropores of which the overall average aperture is about 0.03-0.50 [mu] m; and the material of the metal bracket comprises implantable metal.

The invention discloses a preparation method of a high-resilience expanded polytetrafluoroethylene sealing material, and belongs to the technical field of high polymer material modification. According to the method, high-molecular-weight or modified polytetrafluoroethylene is used as a matrix, and high-orientation fibers are obtained through ultrasonic premixing, twin-screw melt extrusion, stretching and heat setting; dipping the fiber in a dispersion liquid containing high-entropy alloy nanoparticles, carbon nanotubes and graphene nanosheets, carrying out vacuum drying and gradient heat treatment to form a nano-reinforced precursor fiber, and constructing a porous anisotropic skeleton by adopting conventional or supercritical expansion and a specific weaving process; and interface strengthening and surface functionalization are realized through plasma surface treatment, silane coupling agent chemical grafting and wear-resistant coating coating. The obtained sealing material has low density, high strength, high resilience and low compression set, has excellent chemical medium resistance and anti-static performance, and is suitable for sealing parts of flanges, valves and the like under harsh working conditions of petrochemical engineering, electric power, hydrogen energy, aerospace and the like.

The invention discloses a flexible copper-clad plate with high thermal conductivity and low dielectric property and a preparation method of the flexible copper-clad plate. The flexible copper-clad plate comprises an insulating substrate, the composite film is a thermoplastic polyimide / heat-conducting low-dielectric ePTFE / thermoplastic polyimide insulating composite film which is composed of a middle layer ceramic / boron nitride-expanded polytetrafluoroethylene functional hybrid membrane and thermoplastic polyimide layers on the two sides of the middle layer ceramic / boron nitride-expanded polytetrafluoroethylene functional hybrid membrane. And the flexible conductive metal foil is compounded with the single surface, double surfaces or multiple layers of the insulating substrate through a thermal forming compounding process. Through the mode, the flexible copper-clad plate can have excellent peel strength under the adhesive-free condition through structure optimization and process innovation, low dielectric constant and low dielectric loss tangent value can be realized under the high-frequency condition, and meanwhile, the heat conductivity coefficient is remarkably improved. And through continuous production, the efficiency is greatly improved, and a high-reliability base material is provided for the high-end electronic fields such as new energy vehicles, 5G / 6G communication and wearable equipment.

The utility model relates to a waterproof and breathable masking paper composite adhesive tape which comprises a reel and an adhesive tape body, the adhesive tape body is of a four-layer structural design and comprises an anti-sticking layer, a base material layer, a waterproof and breathable layer and an adhesive layer which are sequentially connected from the outer layer to the inner layer, the manufacturing process of the adhesive tape is simplified, and the production efficiency is improved; the anti-sticking layer comprises polytetrafluoroethylene and a titanium dioxide / graphene coating and is used for improving the anti-sticking effect and the ultraviolet-proof performance of the adhesive tape; the waterproof breathable layer comprises expanded polytetrafluoroethylene and nanofibers and is used for improving the waterproof and breathable performance of the adhesive tape and ensuring that the stable effect can be kept in various environments; the adhesive layer comprises polyurethane, a water-based acrylic pressure-sensitive adhesive and an organic silicon modifier, and nano silicon dioxide is uniformly distributed in the water-based acrylic pressure-sensitive adhesive; the adhesive force of the adhesive tape can be improved, cohesive strength is enhanced, weather resistance is improved, aging is delayed, degumming and wiredrawing phenomena are reduced, adhesive residues are reduced, and use experience is improved.

The invention relates to the technical field of polytetrafluoroethylene modification, in particular to a hydrophilic modification method and application of expanded polytetrafluoroethylene. The invention provides a hydrophilic modification method of expanded polytetrafluoroethylene, which comprises the following steps: S1, soaking expanded polytetrafluoroethylene in a photoinitiator solution to obtain soaked expanded polytetrafluoroethylene; s2, coating the surface of the soaked expanded polytetrafluoroethylene with a surfactant solution to obtain coated expanded polytetrafluoroethylene; and S3, carrying out ultraviolet irradiation on the coated expanded polytetrafluoroethylene to obtain the hydrophilic modified expanded polytetrafluoroethylene. According to the hydrophilic modification method of the expanded polytetrafluoroethylene, plasma pretreatment or treatment in a specific atmosphere environment is not needed, the steps are simple, conditions are easy to realize, a few reagents are needed, the three-dimensional structure of the expanded polytetrafluoroethylene cannot be damaged, the water contact angle is obviously reduced, the surface energy is increased, and the adhesive property is improved.

Expanded polytetrafluoroethylene (ePTFE) monofilaments with superior knot pull tensile strength are described herein, which can be used as sutures and in medical devices such as for tethers and anchors for cardiac repair. The properties of these monofilaments balance the need for an inert, soft, lubricious and porous material with sufficient tensile properties for high strength applications.

Self-supporting uniaxially expanded polytetrafluoroethylene (ePTFE) membranes that have high intrinsic strength, a high matrix modulus, and a high crystallinity index are provided. In some embodiments, the ePTFE membrane is stretched in the machine direction. Uniaxially oriented ePTFE membranes have a matrix tensile strength at least about 1000 MPa in the machine direction, a matrix modulus at least about 100 GPa ambient temperature (i.e., about 20°C), and a crystallinity index of at least about 94%. In some embodiments, the ePTFE membrane has a tenacity greater than or equal to about 5 gf / d and a denier less than or equal to about 750 g / 9000 m. In addition, the uniaxially oriented ePTFE membranes have a <P2> orientation of at least about 0.98. Also, the fibrils in the ePTFE membranes have a nearly perfect parallel alignment. The ePTFE membrane may be used to form composites, laminates, fibers, tapes, sheets, tubes, or other three-dimensional objects.

This utility model discloses a device for adjusting the local hardness of expanded polytetrafluoroethylene (ePTFE) sheets, including a support platform, a heating plate, a support structure, and a power module. The heating plate is disposed on the upper side of the support platform. The device further includes: a compression array plate, which is fixed above the heating plate by the support structure and has multiple independent pressure heads on its lower side. The pressure heads are arranged in a matrix, and each pressure head can extend and retract independently in the vertical direction and is equipped with an independent pressure adjustment mechanism; and an intelligent control module, which is powered by the power module and configured to drive the pressure heads to work through the pressure adjustment mechanism according to set pressure parameters. The device for adjusting the local hardness of ePTFE sheets provided by this utility model can locally, reversibly, and dynamically adjust the hardness of ePTFE sheets through a dual mechanism of mechanical compression and thermal energy regulation.

The utility model discloses an expanded polytetrafluoroethylene clamping and wrapping tooth-shaped gasket which comprises a main sealing ring and further comprises an auxiliary sealing ring and an outer reinforcing ring. The auxiliary sealing ring coaxially sleeves the inner side of the main sealing ring; and the outer reinforcing ring coaxially sleeves the outer side of the main sealing ring. The internal main body of the main sealing ring is a metal tooth-shaped framework, and the cross section of the end face is tooth-shaped. The outer side end of the metal tooth-shaped framework is covered with an elastic polytetrafluoroethylene pad. The inner side wall of the main sealing ring is provided with a main sealing ring inner convex rib which is convex inwards, and the outer side wall of the auxiliary sealing ring is provided with an auxiliary sealing ring matching groove which is concave inwards; and the main sealing ring inner convex rib is matched and clamped with the auxiliary sealing ring matching groove. And a gap is formed between the matching of the inner convex rib of the main sealing ring and the matching groove of the auxiliary sealing ring in the axial direction. A concave main sealing ring outer groove is formed in the outer side wall of the main sealing ring, and the inner side of the outer reinforcing ring is connected with the main sealing ring outer groove in a matched and clamped mode. The scheme has the beneficial effects that the inner ring and the outer ring are additionally arranged on the inner ring and the outer ring of the main sealing ring respectively, so that the low-dissipation sealing requirement is met.

The utility model discloses an ultra-light high-strength cable for an unmanned aerial vehicle. The filling strip is located in the center of the cable, the plurality of power transmission core wires are arranged around the filling strip as the center, one signal wire transmission unit and two filling strips are arranged on the side, away from the center, between every two adjacent power transmission core wires, and one filling strip is arranged on each of the two sides of each signal wire transmission unit; the signal line transmission units, the power transmission core wires and the filling strips are integrated to form a cable, the cable is wrapped by an expanded polytetrafluoroethylene EPTFE belt, the expanded polytetrafluoroethylene EPTFE belt is wrapped by a circle of braided shielding layer, and the braided shielding layer is wrapped by a sheath. The unmanned aerial vehicle is ingenious in structural design, the structure is stable, meanwhile, light-weight, high-strength and high-weather-resistance special materials are adopted, the carrying capacity of the unmanned aerial vehicle is improved, and the stability and safety of a signal and power transmission system of the unmanned aerial vehicle in the severe environment are guaranteed. And important support and guarantee are provided for the improvement of the unmanned aerial vehicle technology and the expansion of the application field.

The invention relates to the technical field of polytetrafluoroethylene preparation, and discloses polytetrafluoroethylene and its preparation method, expanded polytetrafluoroethylene and its application. The preparation method of polytetrafluoroethylene comprises: according to different instantaneous heat release at different times, obtaining in advance the instantaneous heat release Q in the conventional polytetrafluoroethylene preparation process; 瞬时 The relationship curve between Q0 and time is used to calculate the average heat release per unit time Q0 of the entire reaction process. The entire reaction is divided into different stages, including Q 瞬时 ≤Q0 at least one stage, and Q 瞬时 > at least one stage of Q0; adding the same reaction raw materials as in the conventional preparation method of polytetrafluoroethylene into the reactor for polymerization reaction; Q 瞬时 ≤Q0 stage, the temperature of the reaction liquid in the reactor is controlled to be T1, Q 瞬时 >Q0 stage, the temperature of the reaction liquid in the reactor is controlled to be T2, T2=T1-(1℃~3℃). This method can produce polytetrafluoroethylene with a narrow molecular weight distribution.

The application discloses a cutting die for expanded polytetrafluoroethylene plate, which comprises a base, a support fixed on the base, a rotating rod penetrating through the support and rotationally connected with the support, the other end of the rotating rod being rotationally connected with the support, a driving mechanism installed on the support and used for driving the rotating rod to rotate intermittently, a through groove arranged at the upper end of the support, a bolt and nut assembly slidably connected in the through groove and capable of being positioned, the bolt and nut assembly being fixedly connected with the upper end of a sliding block, and the rotating rod being sleeved with the sliding block movably connected with the rotating rod. The application can cut the plate at equal intervals without marking the plate by workers, greatly improves the work efficiency, clamps the plate, does not need manual positioning of the plate, increases the stability of the plate, reduces the labor of the workers, and can adjust the position of the cutter to meet the cutting of plates with different lengths and the cutting accuracy.

This invention relates to a membrane-based heat exchanger (MemHEX) tailored for tropical climates to address challenges in indoor air quality, thermal comfort, and energy efficiency. The device features a thermally insulated hexagonal housing that optimizes airflow, minimizing turbulence and pressure drop. At its core, a quasicounterflow arrangement of hexagonal plates is integrated with a sandwich-like assembly of expanded polytetrafluoroethylene (ePTFE) membranes and spacers. This design facilitates the efficient transfer of both sensible and latent heat while maintaining separate pathways for exhaust and supply air. The MemHEX includes supply and exhaust fans strategically positioned to ensure uniform airflow across the heat exchanger core. Environmental sensors automate fan operation, regulating ventilation based on real-time conditions such as temperature, humidity, or air quality. The system also includes high-efficiency particulate air (HEPA) filters for pollutant-free operation. Scalable and efficient, the MemHEX is suitable for residential, commercial, and industrial applications.

A method for making a vascular prosthesis having an outer crimped textile graft and an inner polymeric liner includes securing the polymeric liner to valleys of the crimps of the textile graft while leaving the peaks of the textile graft free of the liner. The polymeric liner is impermeable to blood flow. The inner liner may include expanded polytetrafluoroethylene polymer, and the graft may include polyethylene terephthalate yarns.

A high water transfer electrochemical compressor is described having a ‘n’ transfer of water through the ion conducting membrane of greater than one. This may be accomplished by reducing the equivalent weight of the ion conducting polymer, such as an ionomer to less than about 900 and / or by reinforcing the low equivalent weight ionomer with a support material, such as an expanded polytetrafluoroethylene. This may be accomplished by making components of the electrochemical cell hydrophilic including the electrodes and / or gas diffusion media. This may be accomplished by adding a flow component to a feed fluid or refrigerant, such as an alcohol, acid, or acetone, for example. A flow component may modify an electrode and / or the ion conducting media, by rendering them hydrophilic. A flow component may swell an ion conducting media enable high transport of the working fluid.

This tube is an elongated object having longitudinally constant shape with a uniform wall thickness, preventing local concentration of load during use. The tube is highly durable and stabilizes discharging when used in a peristaltic pump or the like. This tube includes a flow passage 12 penetrating inside longitudinally and a resin section 13 surrounding the flow passage. The resin section is a laminate in which expanded polytetrafluoroethylene layers 16 having voids impregnated with elastomer and elastomer layers 18 each being made from at least one type of elastomer for bonding the polytetrafluoroethylene layers are alternately laminated radially in the flow passage. An average of wall thicknesses of the resin section in at least four mutually intersecting radial directions of the flow passage, a wall thickness ratio calculated from wall thicknesses in opposing directions of the four directions, and the number of laminated polytetrafluoroethylene layers and elastomer layers satisfy predetermined conditions.

A composite material (10) comprising: an expanded polytetrafluoroethylene layer (12); a densified expanded polytetrafluoroethylene layer (16a) connected to the expanded polytetrafluoroethylene layer; a porous expanded polytetrafluoroethylene layer (16b) connected to the densified expanded polytetrafluoroethylene layer; a binder (16c); and a densified intumescent polyethylene layer (14), the adhesive bonding the intumescent polyethylene layer to the porous intumescent polytetrafluoroethylene layer.

The utility model relates to the technical field of subcutaneous implants in medical cosmetic plastic surgery, in particular to a prosthesis. The utility model discloses a prosthesis, the prosthesis comprises at least one prosthesis main body, the prosthesis main body is made of at least one layer of sheet-shaped bulky material distributed with micropore structures for tissue cell growth, the prosthesis main body is provided with a first component and a second component which are integrally processed, and the first component and the second component are arranged on the first component and the second component. The first component and the second component are respectively provided with an outer end side of a square head structure, and an included angle between the central axis of the square head structure of the first component and the central axis of the square head structure of the second component is an obtuse angle. The prosthesis is high in shape universality, a doctor can conveniently design deviation of the supporting legs through the square head design, meanwhile, the abundant micropore structures can induce tissue cells to grow in, and fusion of the tissue cells and the prosthesis body is achieved.

The invention relates to the technical field of waveguide radar substrates, and discloses a waveguide radar substrate manufacturing method which comprises the steps of forming grooves in plates, electroplating the plates, combining the two plates and forming through holes. In actual use, gas contained in the waveguide cavity of the radar substrate manufactured by the method can be communicated with the outside, such as a through hole, through the sheet body made of expanded polytetrafluoroethylene, so that the waveguide cavity can be effectively prevented from being subjected to pressure damage caused by expansion with heat and contraction with cold; and external water vapor or pollutants can be blocked outside the waveguide cavity by the sheet body, so that the stability of the waveguide cavity is maintained, and the waveguide cavity is suitable for application fields with high requirements on electrical performance and harsh environmental conditions.

The present invention provides an expanded polytetrafluoroethylene (EPFE) conductive sealing plate and a method for manufacturing the same. The expanded polytetrafluoroethylene (EPFE) conductive sealing plate includes at least one expanded polytetrafluoroethylene (EPFE) conductive film layer, which includes an expanded polytetrafluoroethylene (EPFE) based film and a plurality of conductive fibers spaced apart on the expanded polytetrafluoroethylene (EPFE) based film. Each conductive fiber penetrates the expanded polytetrafluoroethylene (EPFE) based film and includes a penetration portion and extension portions connected to opposite ends of the penetration portion. The extension portion at each end is inclined and bent relative to the penetration portion, and the extension portions of the plurality of conductive fibers overlap to form conductive surface layers on opposite sides of the expanded polytetrafluoroethylene (EPFE) based film. The expanded polytetrafluoroethylene (EPFE) conductive sealing plate provided by the present invention not only has the advantages of high and low temperature resistance and good sealing performance, but also has good conductivity and a stable structure, capable of achieving an overall conductive effect.

The present application provides self-supporting, uniaxially expanded polytetrafluoroethylene (ePTFE) films having high intrinsic strength, high matrix modulus, and high crystallinity index. In some embodiments, the ePTFE films are stretched in the machine direction. The uniaxially oriented ePTFE films have a matrix tensile strength in the machine direction of at least about 1000 MPa, a matrix modulus at ambient temperature (i.e., about 20°C) of at least about 100 GPa, and a crystallinity index of at least about 94%. In some embodiments, the ePTFE films have a tenacity greater than or equal to about 5 gf / d and a denier less than or equal to about 750 g / 9000 m. Further, the uniaxially oriented ePTFE films have a Gurley number of at least about 0.98 <p2>Orientation. In addition, the fibrils in ePTFE films are nearly perfectly aligned in parallel. ePTFE films can be used to form composites, laminates, fibers, tapes, sheets, tubes, or other three-dimensional objects.< / p2>

The invention discloses an accelerated life test method for expanded polytetrafluoroethylene for aviation, and belongs to the technical field of aircraft maintenance and detection. Comprising the following steps: mounting a sample, and performing at least one accelerated working condition simulation test including repeated compression, medium soaking, heat-moisture treatment, salt spray corrosion, solar radiation and the like; performing thermal aging on the test sample subjected to the simulation test at different temperatures; testing the mechanical property of the sample after thermal aging, and determining a critical value of the mechanical property by taking sealing failure as a judgment standard; and calculating the time when the performance reaches the critical value at different temperatures, and drawing an Amenius diagram to obtain the service life. According to the test method, complex working conditions can be accurately simulated, the service life of the material is efficiently obtained through scientific testing and calculation, a basis is provided for safe replacement of expanded polytetrafluoroethylene for aviation, the problems that a traditional method is difficult to adapt to actual scenes and service life prediction is not accurate are solved, and the reliability of an aircraft sealing system is guaranteed.

The invention provides a multilayer heterogeneous integrated acoustic shielding gas-permeable membrane, a preparation method and application, and belongs to the field of gas-permeable membranes of photoacoustic spectrum gas detection systems. The multilayer heterogeneous integrated acoustic shielding breathable film comprises an upper-layer structure, a middle-layer structure and a lower-layer structure, wherein the upper-layer structure, the middle-layer structure and the lower-layer structure are compounded together to form the breathable film; the upper layer structure adopts a porous support body sprayed with AF2400; the middle layer structure adopts an expanded polytetrafluoroethylene microporous membrane; and the lower-layer structure adopts an anodic aluminum oxide film. The expanded polytetrafluoroethylene microporous membrane and the anodic aluminum oxide membrane are both arranged on the mounting module, and the porous support body sprayed with the AF2400 and the mounting module are assembled through a flexible adhesive. According to the invention, oil-gas separation, gas exchange, pressure difference adaptive adjustment and acoustic shielding can be comprehensively realized, and the application in the field of photoacoustic spectrometry gas detection such as oil-soluble gas detection can be met.

This invention discloses a flexible, bendable composite pipe with spring support for ePTFE membrane winding, its preparation method, and its applications. The composite pipe includes a spring support body; multiple layers of ePTFE expanded polytetrafluoroethylene (ePTFE) membrane wound around the outer surface of the spring support body; the multiple ePTFE membranes are crystalline-linked by a hot-melt sintering process to form fluorocarbon bonds, thus combining the multiple ePTFE membranes with the spring support body to form a composite pipe wall structure. This structure solves the problems of collapse and loosening caused by the softness and deformation of single-layer ePTFE membranes, endowing the pipe with good tensile strength, flexible bending characteristics, and air permeability / filtration functions due to the microporous structure of ePTFE. The pipe is resistant to chemical corrosion and has a wide temperature adaptability range, making it suitable for industrial fluid transport and filtration systems requiring flexible conveying, pressure balance, or the infiltration / emission of specific gases. The preparation method mainly includes winding and hot-melt sintering processes within a specific temperature range.

Expanded polytetrafluoroethylene (ePTFE) tubings are provided with a thermoplastic tie layer coating on the outer surface thereof to serve, e.g., as flexible liners for catheters. The thermoplastic tie layer coating can be anchored into the pores of the ePTFE but advantageously does not permeate through to the inner surface of the tubing. In this way, the outer surface of the tubing can adhere to an outer jacket material while the inner surface of the tubing remains lubricious.

The invention discloses a preparation method of an expanded polytetrafluoroethylene sealing material with conductivity and elasticity, and belongs to the technical field of energy conservation and environmental protection. The method comprises the following steps: carrying out silane coupling and ultrasonic dispersion on nano-silver and graphene in an ethanol medium to form a nano conductive composite dispersion liquid; the preparation method comprises the following steps: mixing polytetrafluoroethylene with a volatile lubricant, performing, performing extrusion-two-way stretching, and sintering to obtain a conductive framework; the framework is subjected to fluororubber emulsion vacuum impregnation and drying, then vulcanization is performed under hot pressing, and foaming forming is performed in the nitrogen atmosphere; perfluoroalkylsilane surface modification is performed to improve hydrophobicity. The obtained sealing material forms a continuous conductive network in a node-fiber microstructure, micropores are filled with elastomers, and the sealing material is suitable for electronic equipment, electric automobiles, chemical engineering, aerospace and other scenes needing conductive shielding and dynamic sealing. The method is simple in process, controllable in parameter, environment-friendly and suitable for large-scale production.

The invention relates to the technical field of waveguide radar substrates, and discloses a waveguide radar substrate, which comprises two plates, two metal coatings and a polytetrafluoroethylene sheet body, the two plates are connected with each other, the polytetrafluoroethylene sheet body is clamped between the two first metal layers, the two second metal layers abut against each other, and the two third metal layers and the polytetrafluoroethylene sheet body jointly form a waveguide cavity; the waveguide radar substrate further comprises a through hole penetrating through the two plates, the two first metal layers and the polytetrafluoroethylene sheet body. In actual use, gas contained in the waveguide cavity of the radar substrate manufactured by the method can be communicated with the outside, such as a through hole, through the sheet body made of expanded polytetrafluoroethylene, so that the waveguide cavity can be effectively prevented from being subjected to pressure damage caused by expansion with heat and contraction with cold; and external water vapor or pollutants can be blocked outside the waveguide cavity by the sheet body, so that the stability of the waveguide cavity is maintained, and the waveguide cavity is suitable for application fields with high requirements on electrical performance and harsh environmental conditions.

The utility model relates to the technical field of electric power protection, and discloses an electric power protection sleeve, which comprises a sleeve structure and a connecting structure, the main body of the sleeve structure is a pipe body made of chlorinated polyvinyl chloride, and the pipe body is provided with an air hole for maintaining the internal air pressure of the pipe body. A breathable film integrally formed with the pipe body through a hot pressing process is arranged at the position of the breathable hole, and an anti-collision net is further fixedly arranged on the side wall of the breathable hole and located on the outer layer of the breathable film. The connecting structure comprises a check block fixedly installed on the outer surface of the pipe body and a magnet embedded in the end face of the pipe body. According to the electric power protection sleeve, a gas-permeable membrane made of ePTFE (expanded polytetrafluoroethylene) is embedded in the non-pressure-bearing side of a sleeve body, the outer layer of the gas-permeable membrane is covered with a metal anti-collision net, the aperture of the ePTFE membrane is 0.1-1 micrometer, gas can be allowed to pass through the ePTFE membrane, liquid water and dust are blocked, the gas-permeable membrane and the sleeve body are seamlessly combined through the hot pressing technology, and the gas-permeable membrane is not prone to falling off. And reduction of mechanical strength caused by traditional trepanning is avoided.

The invention discloses a magnetic substance filtering device and process suitable for lithium battery raw material production, and relates to the technical field of precision filtering equipment, the magnetic substance filtering device comprises a buffer pool, a precision filter, a sludge pool and a clear liquid pool, the precision filter comprises an upper cylinder, a micro-filtration membrane pipe group and a lower cylinder, the upper cylinder is provided with a clear liquid return valve and an overflow pipe, and the lower cylinder is provided with a filter screen; the lower cylinder is provided with a pumping liquid inlet pipe and a backflushing return pipe, a liquid inlet return valve is arranged on the lower cylinder, a plurality of end openings, extending into the lower cylinder, of the pumping liquid inlet pipe are arranged in a cross flow mode, the microfiltration membrane pipe set comprises a connecting part and a membrane pipe, and a plurality of disturbing protrusions are distributed on the peripheral wall of the membrane pipe. The water flow impact direction of the pumping liquid inlet pipe and the direction of the membrane pipe are arranged in a staggered mode, a supporting mechanism is arranged on the membrane pipe, the membrane pipe is a porous expanded polytetrafluoroethylene membrane, and an auxiliary backflushing assembly is arranged in the lower cylinder body. The whole device is reasonable in layout and precise in filtration, weakly magnetic and insoluble impurities in the solution are effectively reduced, and the purity of the lithium battery raw material solution is improved.