184 results about "PTFE fiber" patented technology

The invention relates to the technical field of power transmission, in particular to a moisture-proof cable which sequentially comprises a conductive wire core, a gradient buffer layer, a dynamic sealing layer, a flexible supporting layer and a self-repairing sheath from inside to outside. A gradient buffer layer; the dynamic sealing layer is of a split type sealing structure formed by an outer ring surface sealing lip and an inner ring surface static sealing belt, the outer ring surface sealing lip is formed by embedding a polytetrafluoroethylene fiber reinforcing layer in a silicone rubber matrix, and the surface of the outer ring surface sealing lip is coated with a humidity response type graphene coating; the flexible supporting layer is formed by spirally winding a nickel-titanium alloy belt, and bionic fish scales are welded to the surface of the nickel-titanium alloy belt; the self-repairing sheath is characterized in that a hexagonal honeycomb structure is molded on the outer layer, hydroxyl-terminated polysiloxane and a platinum catalyst are contained in an A-type microcapsule, and modified epoxy resin is contained in a B-type microcapsule. The moisture-proof cable shows excellent corrosion resistance, moisture resistance and self-repairing capability in a humid environment, and can maintain good performance when subjected to external physical impact.

The invention relates to the technical field of high-temperature gas filtration, and particularly discloses a preparation method of a high-temperature-resistant and corrosion-resistant composite spunlace filter material. The preparation method of the filter material comprises the following steps: pretreating the PTFE short fibers, the glass fibers and the high-temperature-resistant glass fiber woven base cloth; mixing the pretreated glass fibers with PI fibers to obtain mixed fibers; the pretreated PTFE fibers and the mixed fibers are respectively subjected to carding, net forming and net laying, the pretreated PTFE fibers form a surface layer, the mixed fibers form a bottom layer, pretreated high-temperature-resistant glass fiber woven base cloth is used as middle base cloth, pre-needled reinforcement and winding are performed to obtain a pre-needled felt, and the pre-needled felt is subjected to spunlace reinforcement, drying and winding to obtain a filter material plain felt; dipping, shaping and laminating the filter material to obtain the high-temperature-resistant and corrosion-resistant composite spunlace filter material. According to the method, a high-temperature-resistant system for increasing the temperature-resistant threshold value layer by layer is formed, the corrosion resistance is enhanced, and synergistic improvement of high temperature resistance and strong corrosion resistance is achieved.

The invention relates to a filter screen and a preparation method and application thereof, and belongs to the technical field of filtering equipment, the filter screen comprises a hydrophobic enhancement layer, a pre-filtering layer and a core filtering layer which are stacked in sequence; the hydrophobic reinforcing layer comprises the following components: metal fibers; the pre-filtering layer is prepared from the following components: basalt fibers; and the core filter layer comprises the following components: polytetrafluoroethylene fibers and polyether-ether-ketone fibers. By designing the structure of the filter screen, the filter screen which can stably work in a high-temperature environment, has excellent hydrophobic performance and filtering efficiency and is controllable in manufacturing cost is obtained.

The superfine bi-component fiber composite needled felt comprises a needled felt body, the bottom layer of the needled felt body is formed by a base layer, the surface layer of the needled felt body is provided with a wear-resistant layer, the top of the base layer is provided with a high-temperature-resistant layer, and the bottom of the wear-resistant layer is provided with a corrosion-resistant layer. And a flame-retardant layer is arranged between the corrosion-resistant layer and the high-temperature-resistant layer. According to the superfine bi-component fiber composite needled felt and the preparation process thereof, in the preparation process, mixed fibers and superfine PSPA sea-island fibers are added, the wear resistance is improved, and through arrangement of the Portland cement polystyrene foam slurry layer, the superfine glass fiber composite filter material, the reinforcing layer and the polysulfonamide fiber layer, the wear resistance is improved; the needle-punched felt has the advantages that the needle-punched felt is high-temperature-resistant, the overall high-temperature-resistant performance of the needle-punched felt is improved, the corrosion resistance is improved due to the arrangement of the PTFE fibers and the polytetrafluoroethylene film coating layer, the flame retardance of the needle-punched felt is enhanced due to the knitted aluminum silicate fibers and the PPS fiber layer, and the overall use performance of the needle-punched felt is improved.

The invention discloses a high PV value polytetrafluoroethylene integral sliding bearing and a preparation method thereof, and the high PV value polytetrafluoroethylene integral sliding bearing is prepared by using polytetrafluoroethylene and fusible polytetrafluoroethylene as polymer matrixes, using sizing modified polytetrafluoroethylene fiber as a main reinforcing component, combining with a lubricating filler, and carrying out low temperature mechanical blending, bidirectional pressing and sinter molding processes. According to the invention, the fusible polytetrafluoroethylene is introduced to modify polytetrafluoroethylene, and the creep resistance and wear resistance of the composite material are improved by constructing a polymer alloy; the polytetrafluoroethylene fiber sized and modified by the heat-conducting filler is used as a main reinforcing filler, so that the heat-conducting property and the bearing capacity of the composite material are improved, and the reduction of strength and toughness caused by introduction of a large amount of high-modulus inorganic filler is avoided. The composite bearing has the advantages of high bearing capacity, high heat conductivity, high strength, high flexibility and excellent friction and wear performance, particularly has a relatively high PV value, and can be applied to transmission parts of mechanical devices in many industries such as chemical engineering, automobiles, pharmacy, food and the like.

The invention relates to the technical field of high-barrier films, and particularly discloses a high-barrier polyvinyl alcohol biaxially oriented film and a preparation method thereof. The high-barrier polyvinyl alcohol biaxially oriented film comprises a polyvinyl alcohol biaxially oriented film base material and a high-barrier coating formed on the polyvinyl alcohol biaxially oriented film base material in a single-side coating manner, and the high-barrier coating is prepared from the following raw materials in parts by weight: 5-7 parts of polyvinyl alcohol; 0.5 to 1 part of amino resin; 0.01 to 0.3 part of a catalyst; 90 to 95 parts of deionized water; 0.01 to 0.05 part of a filling material; 0.01 to 0.1 part of an auxiliary agent is added; 0.01 to 0.03 part of polytetrafluoroethylene fiber; and 0.04 to 0.08 part of porous polyimide microspheres. The high-barrier coating of the high-barrier polyvinyl alcohol biaxially oriented film and the polyvinyl alcohol biaxially oriented film base material have excellent interface bonding stability in a temperature change environment, and the overall application quality is better.

The invention belongs to the technical field of yarn online detection, and particularly relates to a superfine polytetrafluoroethylene fiber yarn online detection method, device and system.The method comprises the steps that whether the heating performance of a heating box reaches the standard or not is judged, and if yes, image data collected by an image detection module are obtained; whether the image collected by the image detection module is qualified or not is judged based on the image data, and if yes, the superfine polytetrafluoroethylene fiber yarn is allowed to be heated and wound; in the heating and rolling process of the superfine polytetrafluoroethylene fiber yarn, whether equipment runs stably or not is judged, if yes, whether the diameter of the yarn is qualified or not is judged, and if yes, the equipment continues to run. According to the device and the method, early warning prompt can be performed in time when abnormity occurs in each link, so that the quality and the production stability of the superfine polytetrafluoroethylene fiber yarn in the heating and winding process are effectively guaranteed, and a final product is ensured to meet related quality standards.

The invention discloses an industrial flue gas denitration filter bag and a preparation method thereof, and relates to the technical field of flue gas denitration. The industrial flue gas denitration filter bag comprises PTFE (Polytetrafluoroethylene) fibers, PPS (Polyphenylene Sulfide) fibers, PI (Polyimide) fibers and PTFE loaded fibers. Wherein the PTFE loaded fiber is a PTFE fiber layer loaded with a modified molecular sieve catalyst; the modified molecular sieve catalyst takes a molecular sieve coated with modified nanorods as a carrier, a vanadium-titanium composite oxide as an active catalytic component and a cerium-titanium composite oxide as a co-catalytic component; the modified nanorod is a molybdenum-tungsten composite oxide modified cerium dioxide nanorod. By introducing the modified molecular sieve catalyst prepared from cerium dioxide nanorods, lanthanum nitrate, molybdenum trioxide and other raw materials, the denitration capacity, the ammonia escape prevention capacity, the sulfur poisoning resistance, the hydrothermal stability and the working life are further improved, and an active temperature window is widened. Therefore, the method has a wider application prospect.

The invention provides a composite thermal insulation material, a battery assembly and electric equipment. The composite thermal insulation material comprises polytetrafluoroethylene fibers, reinforced fibers, inorganic aerogel particles and an anti-infrared radiation material. The composite heat insulation material has good heat insulation performance and high compression strength.

The invention relates to a non-metal high-temperature-resistant temperature-sensing optical cable, and belongs to the technical field of cables. The high-temperature-resistant optical cable adopts a multi-layer composite structure design, and the high-temperature-resistant optical fiber is taken as a center and is sequentially wrapped by the tight wrapping layer, the high-temperature-resistant protection piece, the high-temperature-resistant inner protection layer and the high-temperature-resistant outer sheath. The tight wrapping layer adopts a polyimide composite material, so that the thermal stability and the mechanical strength of the optical fiber are enhanced; the high-temperature-resistant protection piece is filled with aluminum silicate aerogel by using a polytetrafluoroethylene corrugated pipe, so that the heat insulation and high-temperature-resistant characteristics are improved; the material of the inner protective layer is compounded with high-performance fillers such as boron nitride nanotubes, graphene oxide, silicon carbide whiskers and the like, so that excellent mechanical properties and corrosion resistance are provided; and the outer sheath is formed by three-dimensionally weaving the aramid fiber, the modified silicon carbide fiber and the polytetrafluoroethylene fiber, so that the tensile strength and the impact resistance of the optical cable are greatly enhanced. The optical cable can be applied to the field of high temperature sensing monitoring, and has the advantages of high temperature resistance, corrosion resistance, mechanical damage resistance and the like.

The invention relates to the technical field of industrial filter materials, in particular to a spunlace filter material for a filter cartridge and a preparation method of the spunlace filter material for the filter cartridge, and the preparation method comprises the following steps: S1, respectively opening and mixing modified polytetrafluoroethylene fibers and polyester fibers to obtain mixed fibers, and carding, lapping, combining and pre-needling the mixed fibers to obtain a pre-needled felt; s2, the pre-needled felt is subjected to spunlace reinforcement and drying shaping, and a filter material plain felt is obtained; s3, singeing the surface of the filter material plain felt, soaking the filter material plain felt in the finishing liquid, mangling the soaked filter material plain felt, and drying to obtain the spunlace filter material for the filter cartridge. The flame retardant property, corrosion resistance and filtering efficiency of the spunlaced filter material for the filter cartridge are comprehensively improved through chemical crosslinking of epoxy groups introduced to the surfaces of the modified polytetrafluoroethylene fibers and amino groups on the surfaces of the modified silicon dioxide and a finishing liquid impregnation technology.

The invention relates to the field of filter materials, and discloses a denitration catalyst-loaded filter bag and a preparation method thereof, the filter bag comprises interface modifier impregnated modified polytetrafluoroethylene fiber and a catalytic additive loaded on the modified polytetrafluoroethylene fiber, the interface modifier is prepared by carrying out hydrolysis-polycondensation on ethyl orthosilicate, perfluorooctyl ethyl trimethoxy silane, trimethyl borate and 3-(2, 3-epoxypropoxy) propyl trimethoxy silane, and the interface modifier is prepared by carrying out hydrolysis-polycondensation on ethyl orthosilicate, perfluorooctyl ethyl trimethoxy silane, trimethyl borate and 3-(2, 3-epoxypropoxy) propyl trimethoxy silane; the catalytic additive is prepared by using polyether PluronicF127, 1, 3, 5-trimethylbenzene and dopamine as raw materials through emulsion-induced interface assembly and externally introducing mesoporous silica to prepare a hollow spherical catalyst carrier, then loading cerium and manganese precursors onto the surface of the hollow spherical catalyst carrier, and coating with a titanium dioxide shell layer. The filter bag prepared by the invention has good denitration activity, sulfur resistance, water resistance, hydrophobicity and friction resistance.

The invention provides a dry-process low-temperature pulse iodine positive electrode preparation method and a battery, and relates to the technical field of iodine positive electrode preparation, the iodine positive electrode preparation method comprises the following steps: mixing elemental iodine with activated carbon to obtain a carbon-iodine composite material, then putting the solid powdery carbon-iodine composite material, a conductive agent and polytetrafluoroethylene into a high-speed stirrer, and stirring at a high speed; and sequentially carrying out constant-speed intermittent pulse stirring, speed-reducing pulse stirring and speed-increasing pulse stirring, and finally rolling to obtain the iodine positive electrode. According to the stirring operation, the temperature rise effect in the high-speed stirring process is inhibited, the mixture obtained after polytetrafluoroethylene fiberization is obtained through low-temperature pulse stirring, the surface of the prepared iodine positive plate is smooth and flat, the cracking phenomenon does not exist, the shearing force is regulated and controlled through low-temperature pulse stirring, mechanical disturbance is weakened, and the iodine positive plate has the good application prospect. And the temperature is reduced to inhibit thermal desorption of iodine molecules, so that the damage to the iodine adsorption effect of porous carbon is reduced, and the mechanical strength and electrochemical performance of the electrode are remarkably improved.

A preparation method of a brake friction plate belongs to the technical field of friction plate materials, and adopts viscose, polyimide fiber, polytetrafluoroethylene fiber, carbon fiber and copper fiber to prepare net-shaped woven cloth; the preparation method comprises the following steps: mixing porous nano aluminum oxide, hexagonal boron nitride, zeolite powder, crystalline flake graphite, magnesium oxide, copper powder, potassium hexatitanate whiskers, carbon nanotubes, vermiculite, mica, sodium bicarbonate, 1, 3-bis (tert-butylperoxy isopropyl) benzene, phenolic resin powder, polytetrafluoroethylene powder, epoxy resin and nitrile rubber to prepare a viscous mixture; and adding the mixture into the net-shaped woven cloth, and carrying out heating treatment, compression molding and curing treatment. The wear resistance of the prepared friction material is effectively improved, the friction coefficient reaches 0.469, and the wear rate is 0.13 * 10 <-7 > cm < 3 > (N.M) <-1 >; the impact strength is 2.3 KJ / m < 2 >, and the shear strength reaches 2.8 MPa; the brake noise of the friction plate material is effectively reduced, and the frequency of noise greater than 60dB in 2000 testing processes is only about 10 times.

The invention provides an LCP (Liquid Crystal Polymer)-based copper-clad plate as well as a preparation method and application thereof. The LCP-based copper-clad plate comprises PTFE (Polytetrafluoroethylene) fiber cloth, the first LCP thin film, the first metal film and the first copper layer are sequentially stacked on the surface of one side of the PTFE fiber cloth in the direction away from the PTFE fiber cloth; the second LCP film, the second metal film and the second copper layer are sequentially stacked on the surface of the other side of the PTFE fiber cloth in the direction away from the PTFE fiber cloth. In the LCP-based copper-clad plate, the PTFE fiber cloth with relatively low dielectric constant and dielectric loss, the first LCP film and the second LCP film are stacked, so that the dielectric constant and dielectric loss of the finally obtained LCP-based copper-clad plate are reduced; in addition, the LCP-based copper-clad plate has relatively high peel strength. Therefore, the LCP-based copper-clad plate has excellent dielectric property and good copper layer bonding property at the same time.

The invention provides a lithium-manganese button cell positive electrode ring prepared based on a dry electrode process as well as a preparation method and application of the lithium-manganese button cell positive electrode ring. The method comprises the following steps: premixing electrolytic manganese dioxide (EMD) powder, a conductive agent and low-melting-point polytetrafluoroethylene (PTFE) fibers in a low-temperature environment; carrying out high-speed shearing on the premixed material to form a dry electrode blank material with self-supporting capability; the obtained dry electrode blank material is subjected to hot rolling through a heating roller device, and an obtained film material is conveyed back to the heating roller device to be subjected to second face rolling; wherein the temperature of the roller is controlled within a temperature range which is lower than the melting point of the PTFE fiber but is enough to enable the PTFE fiber to creep, and meanwhile, high pressure is applied; and die cutting and forming. The positive electrode ring of the lithium-manganese button cell prepared by the method has a unique gradient pore structure and a high-conductivity network, and polarization is greatly reduced, so that the cell is more suitable for an application scene of high pulse current discharge.

The utility model discloses a destaticizing mechanism for polytetrafluoroethylene fiber production, which comprises a base, a lifting adjusting mechanism is arranged on the base, a concave mounting rack is arranged on the lifting adjusting mechanism, a first destaticizing cylinder and a second destaticizing cylinder are respectively and fixedly welded at two ends of the concave mounting rack, and the first destaticizing cylinder and the second destaticizing cylinder are fixedly welded at two ends of the concave mounting rack. A mounting plate is fixedly mounted at the front end of the first static electricity removing barrel, and two static electricity removing fans which are symmetrically arranged up and down are fixedly mounted on the mounting plate. Through cooperation of the first static electricity removing cylinder, the second static electricity removing cylinder, the connecting cylinder, the mounting plate, the static electricity removing fan and other components, charged air blown out by the static electricity removing fan can be blown into the second static electricity removing cylinder through the connecting cylinder after static electricity of polytetrafluoroethylene fibers passing through the first static electricity removing cylinder is removed; the polytetrafluoroethylene fibers entering the first static electricity removing cylinder are subjected to static electricity removing pretreatment, and the static electricity removing effect of the polytetrafluoroethylene fibers is greatly improved.

The invention belongs to the technical field of filter presses, and discloses a filter press forced cake unloading filter cloth and a forced cake unloading mechanism, the filter press forced cake unloading filter cloth comprises a composite filter cloth, the composite filter cloth comprises a filter layer and a base cloth layer, the filter layer is formed by compounding polytetrafluoroethylene, polyphenylene sulfide and matrix resin, and the base cloth layer is formed by compounding polytetrafluoroethylene, polyphenylene sulfide and matrix resin. The warps of the base cloth layer are formed by twisting polytetrafluoroethylene fibers and zirconium oxide fibers. The polytetrafluoroethylene has corrosion resistance, the polyphenylene sulfide has high temperature resistance, and the zirconium oxide fiber has a synergistic effect of thermal shock resistance, so that the composite filter cloth can stably run for a long time in high-temperature, high-pressure and acid-base environments, the problem that traditional filter cloth is easy to age and damage is solved, and the composite filter cloth optimizes the air permeability and the filtering precision, and has a good application prospect. And the filter cloth has the advantages of corrosion resistance, reduction of filtrate leakage pollution, reduction of waste generation, improvement of the service life, meeting of green production requirements, wide application in the fields of industrial dust removal, chemical filtration, aerospace and the like, and higher adaptability compared with the traditional filter cloth.

The invention relates to the technical field of self-lubricating materials, in particular to a self-lubricating fabric gray fabric and a preparation method and application thereof, a self-lubricating liner material and a preparation method and application thereof, and a self-lubricating fabric composite material and a preparation method and application thereof. The preparation method comprises the following steps: sequentially performing first twisting and first sizing on meta-aramid fibers to obtain pretreated meta-aramid fibers; sequentially performing second twisting and second sizing on polytetrafluoroethylene fibers to obtain pretreated polytetrafluoroethylene fibers; weaving the pre-treated meta-aramid fiber and the pre-treated polytetrafluoroethylene fiber to obtain a fabric gray fabric; sequentially performing dopamine-silane coupling agent modification on the gray fabric to obtain the self-lubricating gray fabric. Based on a fabric weaving pretreatment technology and a dopamine-silane coupling agent synergistic interface treatment technology, the prepared self-lubricating fabric grey cloth has excellent bonding strength, has excellent friction and wear properties in a working condition environment with a variable temperature range of-55-230 DEG C, and is long in service life.

The present invention discloses a coalescence separation system and method for aqueous organic phase in the rare earth extraction process. The system includes a pre-filtering unit and a coalescence separation unit; the pre-filtering unit includes a pre-filter, and the coalescence separation unit includes a horizontal coalescence separator; the pre-filter is configured to pre-filter the aqueous blank organic phase to remove solid particles, obtaining the pre-filtered aqueous blank organic phase; wherein, the aqueous blank organic phase is obtained by hydrochloric acid back-extraction and pure water washing during the rare earth extraction process; the horizontal coalescence separator includes a horizontal coalescence separator body and coalescence filter elements; the outer layer of the coalescence filter element is a perfluoroethylene-propylene fiber layer, and the inner layer is a polytetrafluoroethylene fiber layer; the theoretical flow rate of a single coalescence filter element is less than or equal to 1.5 m<supgt;3< / supgt> / h. This system can remove trace water in the aqueous blank organic phase generated during the rare earth extraction process, and the water removal efficiency is greater than 80%.

The application relates to a filter screen and a preparation method and application thereof, and belongs to the technical field of filtering equipment. The filter screen comprises a hydrophobic reinforcing layer, a pre-filtering layer and a core filtering layer which are sequentially stacked; the hydrophobic reinforcing layer is composed of metal fibers; the pre-filtering layer is composed of basalt fibers; and the core filtering layer is composed of polytetrafluoroethylene fibers and polyether ether ketone fibers. The filter screen can stably work in a high-temperature environment, has excellent hydrophobic performance, high filtering efficiency and controllable manufacturing cost through the design of the structure of the filter screen.

The present application relates to the technical field of battery preparation, and more particularly to a dry method multi-layer composite electrode film, a preparation method thereof, an electrode sheet and a battery. The dry method multi-layer composite electrode film comprises an electrolyte induction layer, an active material layer, a structure layer and a buffer layer. The electrolyte induction layer is formed by a polar organic high-molecular cross-linked organic film base material, and the electrolyte is better infiltrated into the electrode interior through the attraction of polar molecules to the electrolyte. The structure layer is supported by a high-strength organic film, which improves the structure and tensile strength of the dry method electrode self-supporting film. The buffer layer is formed by an elastic organic high-molecule film, which sets an elastic buffer layer for the multi-layer electrode sheet structure, plays a buffering role when the active material particles swell and shrink, and prevents the destruction of the PTFE fiber filament structure or the electrode sheet structure caused by the volume change of the particles. The present application solves the problems of low mechanical tensile strength, poor electrolyte infiltration and weak volume change resistance in the prior art.

The present application relates to filter cotton technical field, specifically, it is a kind of high-temperature oven special heat-resistant filter cotton and its preparation process.It includes the following raw materials: polytetrafluoroethylene fiber, fluoroethylene carbonate, silicone resin, 2,2-dimethylol propionic acid, oil agent, pore-forming agent, adhesive and silicon carbide fiber.In the present application, under high-temperature oven working condition, polytetrafluoroethylene fiber melts and flows to wrap silicon carbide fiber to form "sheath-core" sealing structure, which can block the penetration of corrosive medium;fluoroethylene carbonate decomposition product reacts with the surface of silicon carbide fiber to form nanocomposite layer, its micro-nano level rough interface can induce airflow turbulence, and micropore can prolong airflow path, further improve the diffusion capture efficiency of submicron particles, so that filter cotton can still maintain high interlaminar peeling strength after thermal cycling under high-temperature oven working condition, thereby ensuring the premise of filtration performance to improve the high-temperature resistance of filter cotton.

The utility model discloses a multi-layer composite dust removal filter material bag, which belongs to the technical field of dust removal filter material bags and comprises a filter material bag body and a cage frame, a high-temperature-resistant layer is woven on the surface of the filter material bag body and comprises a PPS (polyphenylene sulfite) fiber layer, a PI (polyimide) fiber layer and a PTFE (polytetrafluoroethylene) fiber layer, through holes are formed in the surface of the cage frame, and connecting columns are arranged in an inner cavity of the cage frame. The connecting column is fixedly connected with the cage frame through a group of reinforcing ribs, the PPS fiber layer, the PI fiber layer and the PTFE fiber layer are consistent in thickness and are 0.3 mm-0. 9mm in thickness, the inner surface of the PPS fiber layer is woven on the outer surface of the PI fiber layer, and the inner surface of the PI fiber layer is woven on the outer surface of the PTFE fiber layer. According to the high-temperature-resistant filter material bag, the characteristics of the PPS fiber layer, the PI fiber layer and the PTFE fiber layer are utilized, so that the filter material bag body has a high-temperature-resistant function and can resist erosion of high-temperature waste gas and corrosive substances, and damage caused by high temperature and chemical corrosion is reduced.

The utility model discloses a high-elasticity polytetrafluoroethylene hose, and belongs to polytetrafluoroethylene tubes. The high-elasticity polytetrafluoroethylene hose comprises a first pure polytetrafluoroethylene hose body, the outer layer of the pure polytetrafluoroethylene hose body is covered with a first polytetrafluoroethylene fiber layer, the outer layer of the first polytetrafluoroethylene fiber layer is covered with an expanded polytetrafluoroethylene layer, and the outer layer of the expanded polytetrafluoroethylene layer is covered with a second polytetrafluoroethylene fiber layer. The outer layer of the second polytetrafluoroethylene fiber layer is sleeved with a second pure polytetrafluoroethylene pipe body. In addition to corrosion resistance, electrical insulation, temperature resistance and the like, the cable also has the advantages of higher elasticity, lower bending strength, smaller bending curvature radius, smooth inner wall, small resistance and the like.

The invention relates to the technical field of knitted fabrics, and provides an anti-pilling knitted fabric, which comprises an anti-pilling surface layer, a middle layer for increasing the elasticity and extensibility of the knitted fabric, and a bottom layer for increasing the air permeability and comfort of the knitted fabric, the surface layer is formed by weaving polytetrafluoroethylene fibers, the middle layer is formed by weaving spandex fibers, and the bottom layer is formed by weaving spandex fibers. The surface layer is formed by weaving cotton fibers, the middle layer is formed by weaving cotton fibers, the bottom layer is formed by weaving cotton fibers, the surface layer accounts for 20-30%, the middle layer accounts for 40-50%, the bottom layer accounts for 20-30%, and hot melt adhesive films used for bonding and fixing are arranged between the surface layer and the middle layer and between the middle layer and the bottom layer. By means of the technical scheme, the problems that in the prior art, the anti-pilling effect depends on physical mixing of fibers to a large extent, and friction between the fibers and burrs on the surfaces of the fibers still possibly cause generation of pilling are solved.

The invention discloses homogeneous dust removal-catalytic dioxin removal filter cloth and a preparation method thereof, and belongs to the technical field of dust removal and catalytic removal of harmful gases such as dioxin. The preparation method comprises the following steps: carrying out loading, drying, roasting and crushing treatment on a catalyst precursor mixed solution and carbon fibers to obtain catalyst-carbon fiber composite powder; the catalyst-carbon fiber composite powder and deionized water are fully stirred and mixed, and a catalyst suspension injection is obtained; and injecting the catalyst suspension injection into the PTFE fiber filter material in a needling injection manner, and carrying out singeing, calendaring, drying and shaping treatment to obtain the homogeneous dust removal-catalytic dioxin removal filter cloth. According to the catalytic filter cloth prepared by the invention, the load rate is obviously improved, a catalyst is uniformly distributed, a dispersed and loose three-layer structure in the prior art is changed into an integrally compact single-layer structure, and the problems of damage and falling of a filter bag body in the prior art can be avoided during back flushing operation.

The invention relates to the technical field of dust removal of high-temperature flue gas, and particularly discloses a production method of a glass fiber PTFE (Polytetrafluoroethylene) base cloth reinforced high-temperature-resistant filter material. The production method comprises the following steps that glass fiber filament yarn is subjected to heat treatment at 350-400 DEG C, the glass fiber yarn subjected to heat treatment passes through composite emulsion and is dried, and warp yarn is obtained; taking the PTFE filament yarns as weft yarns, and making the warp yarns and the weft yarns into woven cloth by adopting a rapier loom, so as to obtain glass fiber PTFE base cloth; the preparation method comprises the following steps: mixing chopped PTFE fibers and chopped glass fibers according to a weight ratio of (4-7): (3-6), opening and carding, and carrying out lapping, grid connection and pre-needling by taking glass fiber PTFE base cloth as base cloth, so as to obtain a composite pre-needled felt; the composite pre-needled felt is subjected to spunlace reinforcement treatment and singeing and then soaked in a stiffening agent, mangling and drying are conducted after soaking, and the glass fiber PTFE base cloth reinforced high-temperature-resistant filter material is obtained. The mechanical property of the filter material can be improved.

The invention relates to the technical field of dust-free cloth laser cutting, and particularly discloses a laser automatic cutting all-in-one machine and method for dust-free cloth, the laser automatic cutting all-in-one machine comprises a main body, and the main body is provided with a material conveying mechanism, a laser cutting mechanism and a throwing and beating cleaning mechanism; black smoke generated by laser cutting of the dust-free cloth through the laser cutting head is sucked away by negative pressure generated by the conical cabin through gaps between fibers of cross points of the polytetrafluoroethylene fiber woven grids, and the situation that black spots are generated on the honeycomb-shaped conveying belt is reduced; molten chips obtained after laser cutting are adhered to the intersection of the honeycomb-shaped conveying belt, and when the honeycomb-shaped conveying belt circulates to the bottom, a plurality of plastic rubber plates on a functional roller synchronously running with the honeycomb-shaped conveying belt conduct throwing, beating, vibrating and knocking operation on the honeycomb-shaped conveying belt under the action of centrifugal force and plasticity of the plastic rubber plates; according to the dust-free cloth laser cutting device, the molten chips at the cross points of the honeycomb-shaped conveying belt are vibrated to fall into the conical cabin, manual cleaning is not needed, the downtime is shortened, and the dust-free cloth laser cutting efficiency is improved.

The utility model relates to the technical field of laminating machines, in particular to a laminating positioning device for a laminating machine, which comprises a laminating machine body, a base arranged at the lower end of the laminating machine body, a movable block arranged at the upper end of the base, a workbench fixedly arranged on the top surface of the movable block, a groove arranged on the top surface of the workbench, and a plurality of micropores arranged at the bottom of the groove. A cavity is formed in the workbench, a vacuum pump is installed on the side wall of the base through an installation base, the air inlet end of the vacuum pump communicates with a telescopic hose, and two positioning assemblies are installed on the workbench in a central symmetry structure. The pressure in the adsorption process is buffered, stress concentration is avoided, friction and damage to the materials are further reduced, indentation, tearing or deformation of the surfaces of the materials in the attaching process are reduced, the attaching quality and the yield are improved, the problem that the edges of the materials warp or the middles of the materials collapse is solved, and bubbles on the attaching interface are reduced.