356 results about "PTFE fiber" patented technology

Disclosed is a knitted article, and a method of producing such an article, having at least one PTFE fiber with oriented fibrils forming multiple fiber cross-over points wherein PTFE fiber is self-bonded in at least one of the cross-over points.

Disclosed is a knitted article, and a method of producing such an article, having at least one PTFE fiber with oriented fibrils forming multiple fiber cross-over points wherein PTFE fiber is self-bonded in at least one of the cross-over points.

The invention discloses a self-lubricating composite material gasket for a bearing and a preparing method for the gasket. A fiber mixed fabric is formed by weaving PTFE (polytetrafluoroethylene) fiber with at least one type of other fiber; an impregnated material is coated on the surface of the fiber mixed fabric; the final thickness of the fiber mixed fabric is 0.30 to 0.55 mm; the thickness of the gasket is 0.35 to 0.60 mm; the weight ratio of the PTFE fiber to the gasket is 0.3 to 0.7; and the other types of fibers can be any one or a few of aramid fiber, carbon fiber, high-strength polyester fiber and cotton fiber. The self-lubricating gasket has the characteristics of high strength and low friction coefficient, and is suitable to be used in heavy-duty occasions under the temperatures ranging from -50 to 180 DEG C.

A refractory filtering fluorine fiber material used for the incident surface is composed of a basic felt consisting of cloth substrate and fibrous surface layer, a covering layer made of teflon fibers, and a smooth surface layer. Its preparing process includes such steps as providing cloth substrate, preparing fibrous surface layer, needling to become felt, preparing covering layer, needling, and hot rolling for fixating shape.

The invention discloses PET (polyethylene glycol terephthalate) fiber / teflon fiber composite sound absorbing cotton, which is prepared from the following ingredients in parts by weight: 70 to 80 parts of PET fibers, 40 to 50 parts of teflon fibers, 10 to 15 parts of emulsifying agents OP-30, 5 to 10 parts of peregal O-20, 80 to 100 parts of PP (propene polymer), 30 to 40 parts of HIPS (high impact polystyrene), 15 to 20 parts of activated clay, 10 to 15 parts of modified kieselguhr, 2 to 3 parts of stearic acid, 5 to 8 parts of dioctyl adipate, 4 to 6 parts of cresyl diphenyl phosphate, 2 to 3 parts of liquid paraffin, 1 to 2 parts of 3-aminopropyltrimethoxysilane, 2 to 3 parts of calcium stearate, 1 to 2 parts of barium stearate, 0.5 to 1.5 parts of anti-aging agents RD and 1 to 2 parts of antioxidants DLTP (dilauryl thiodipropionate). The sound absorbing cotton prepared by the invention has the advantages that the appearance evenness is good, the thickness is uniform, the hand feeling is soft, the product bonding degree is good, the tensile performance is high, the sound absorbing performance is excellent, the flame retardant effect is good, and the like.

A hollow fiber membrane fluid transport device and its method of manufacture are disclosed wherein the fibers are comprised of Polytetrafluoroethylene (PTFE), and the potting materials are comprised of fluorocopolymer and or fluoroterpolymer based materials. The potting method described herein, utilizes a compressed chemically resistant fluorocopolymer and or fluoroterpolymer film, allows for ease of manufacture without destruction of the PTFE hollow fibers, with high packing densities, and without the processing complexity of pre-melting, extruding, or chemical crosslinking of any polymeric adhesives. Furthermore, the PTFE hollow fibers can be treated with a fluoropolymeric solvent solution before the chemically resistant film is applied to enhance the adhesion of the PTFE fiber to the film. PTFE hollow fibers, and its respective fluoro-co and terpolymers as potting films, impart high packing densities, superb chemical resistance and temperature resistance without membrane contamination, or low fiber pull strength, as is sometimes observed with standard potting materials such as polyurethane and epoxy.

A polytetrafluoroethylene (PTFE) fiber includes a filament obtained by partially slitting an oriented PTFE film in a lengthwise direction of the film. Emboss processing is conducted linearly along the lengthwise direction of the film and like a zigzag shape or a convexo-concave shape in a width direction of the film, followed by slitting, whereby the filament includes a network structure in which single fibrils that are opened partially are arranged regularly. A PTFE short fiber is obtained by cutting the above filament and includes a branch structure. Thereby, a PTFE fiber with a small average fineness of single fibrils, a uniform fineness and a single-peak distribution with the peak at a center of fineness and with a high production yield and uniform and stable branch structure can be provided and a method for manufacturing the PTFE fiber can be provided.

A bearing having a surface and a self-lubricating surface coating composition deposited on the surface, wherein the self-lubricating surface coating composition includes a curable acrylate composition having a metallic composition. The metallic composition having a metallic acrylate compound according to Formula I:andabout 30 mass % to about 45 mass % PTFE fiber.

The invention discloses a high-temperature resistant fiber layer composite filter material and a method for preparing the same. The cross section of the material adopts a triple-layer structure, the upper layer and the lower layer are both a mixed fiber layer, and the middle layer is the PTFE base fabric layer. The preparation comprises the following steps of: preparing PPS fibers and PTFE fibers for later use; mixing two kinds of raw materials in a cotton-mixing box to obtain a preliminary mixed material; loosening the preliminary mixed material in a loosening machine; performing refined mixing of the loosened material in the cotton-mixing box; carding the refined mixing material into planar network fibers by a carding machine; spreading the planar network fibers by a lapping machine to make the mixed fiber layers; adding the PTFE base fabric layer between the two mixed fiber layers; preparing the composite fiber material by a needling machine; and putting the composite fiber material in shaping equipment for shaping, putting the composite fiber material in coating equipment for coating, and then performing surface singeing treatment to obtain the filter material. The filter material of the invention possesses high thermal stability, chemical stability, corrosion resistance and electrical property, and compared with the conventional materials, the oxidation resistance and the corrosion resistance of the filter material are greatly improved.

The invention discloses a polytetrafluoroethylene hollow fiber micro-porous film and a preparation method thereof. The preparation method comprises the preparation steps of: preparing a primary PTFE (Polytetrafluoroethylene) hollow fiber, carrying out heat treatment, stretching to form a hole, sintering and sizing. According to the polytetrafluoroethylene hollow fiber micro-porous film and the preparation method thereof, a pushing-pressing molding PTFE fiber pipe preparation technology is organically combined with a stretching-method micro-porous film preparation technology; an un-sintered PTFE fiber pipe prepared by a pushing-pressing molding method is a primary hollow fiber and the film is prepared by a stretching method, so as to realize the effective control of a pore diameter structure, and a PTFE hollow fiber film with needed hole diameter, higher porosity and large mechanical strength is obtained; furthermore, the polytetrafluoroethylene hollow fiber micro-porous film has a simple process, has no pollution to an environment, is easy to operate and does not need subsequent treatment; and therefore, the technical problems that the primary PTFE hollow fiber is more fragile and is easy to damage under the effect of external force, a process of stretching to form the hole is difficult, the hole diameter and the porosity are difficult to control are solved.

The invention discloses a preparation method of PPS superfine fiber compound filter material. According to the preparation method, the dust facing surface is formed by blending PPS / PET sea-island composite fiber and polytetrafluoroethylene PTFE fiber, wherein the weight proportion of the PPS / PET sea-island composite fiber is 40-60%; base cloth is formed by interweaving 100% PTFE filaments along warp and weft direction; the air purification surface adopts 100% PPS fiber; the method comprises the steps of preparing a compound needled felt provided with the dust facing surface containing PPS superfine fiber by a needle punching technology and an alkali treatment splitting and sanding technology, and carrying out spunlace reinforcement and after-finishing treatment to obtain the PPS superfine fiber compound filter material. According to the filter material, the PTFE filter and the PPS superfine fiber of the dust facing surface are closely interspersed and combined, so that the aperture is effectively reduced, the blockage caused by fine particulate matter can be reduced during filtering, the filtration resistance is reduced, the dust removal times are reduced, the oxidation resistance is improved, and the filtering efficiency is improved; the flue gas emission concentration is less than or equal to 1mg / m<3>, and the particulate matter (PM) 2.5 dust particle filtering efficiency reaches up to more than 99.99%.

The invention discloses a modified polytetrafluoroethylene fiber and a preparation method thereof, in particular to a polytetrafluoroethylene fiber with an antistatic function and a preparation method thereof. The fiber comprises the following components by weight percent: 98.5-99.5% of polytetrafluoroethylene and 0.5-1.5% of nano carbon fiber powder. The preparation method of the fiber comprises the following steps of preparation, blending, oil addition, compaction, extruding, rolling, sintering, drafting, splitting, carding, winding, curling, sizing and chopping so as to obtain a chopped fiber. The invention has the beneficial effects that as long as the polytetrafluoroethylene fiber with an antistatic function contacts with an escaping approach, the charge generated by the fiber can be released in time, thereby enabling the fiber to have no static electricity charges or reduce the static electricity charge quantity. In the preparation method in the invention, because the nano carbon fiber is added, the mesh interspace among the polytetrafluoroethylene molecules is filled, the fiber strength is improved, and the physics plastic deformation property of the polytetrafluoroethylene is effectively improved, thereby enabling the fiber to have creep resistance. The finished product obtained by the method is the fiber with the functions of anti-static electricity, creep resistance and high strength; and the self-deashing capability of the polytetrafluoroethylene is improved by adding the nano carbon fiber powder in the method.

The invention provides a high-performance PTFE (Polytetrafluoroethylene) needled felt filter material and a preparation process thereof. The filter material sequentially comprises a fine denier PTFE fiber mesh layer, a first base fabric layer, an upper PTFE fiber mesh layer, a second base fabric layer and a lower PTFE fiber mesh layer; the fine denier PTFE fiber mesh layer is made by pre-treating, pre-opening and carding a fine denier PTFE fiber, the first base fabric layer and the second base fabric layer are made by pre-treating PTFE base fabrics, and the upper PTFE fiber mesh layer and the lower PTFE fiber mesh layer are made by pre-treating, pre-opening and carding common PTFE fibers. The filter material provided by the invention is stable in structure, high in filter precision and strength, and good in heat resistance and corrosion resistance, and is used for filtering smoke and collecting products under various complex working conditions.

The invention discloses a masonry mortar produced by construction solid waste. The masonry mortar comprises the following raw materials in parts by weight: 150-200 parts of cement, 900-1,200 parts of construction solid waste, 20-30 parts of glazed hollow beads, 30-40 parts of limestone, 10-20 parts of shell powder, 2-3 parts of magnesium sulfate heptahydrate, 5-10 parts of redispersible emulsion powder, 2-3 parts of polytetrafluoroethylene fibers, 0.8-1 part of Butyl tin tris-2-ethylexanoate, 2-3 parts of calcium phosphate, 4-6 parts of graphite powder, 1-2 parts of nano carbon powder, 1-2 parts of aluminium dihydric phosphate, 0.8-1 part of triethavolamine oleate soap and 2-4 parts of aluminum nitride powder. The masonry mortar provided by the invention is low in cost, can be used only by adding water and uniformly stirring according to the required amount during construction operation, is low in material consumption and waste, and has the advantages of high adhesion strength, low dry shrinkage rate, excellent anti-freezing durability, low thermal conductivity, good heat preservation performance, favorable workability, environmental friendliness and innocuity.

The invention relates to a method for preparing polyfluortetraethylene fiber with dioxin decomposition function. The method comprises the following steps: firstly, polyfluortetraethylene emulsion is adopted to carry out surface modification on dioxin decomposition catalyst powder; then, the polyfluortetraethylene resin powder and the modified catalyst powder are mixed, and are mixed with liquid lubricant to process the polyfluortetraethylene fiber through extruding, rolling, vertical stretching, sintering, molding, fiber opening and other processes. The method can effectively avoid loss of catalyst powder in the fiber during using. The fiber material can be widely applied to the dust-removal and waste gas decomposition of high-temperature tail gas. Compared with the prior art, the method has the advantages of simple and easy process, low manufacturing cost, non pollution and the like.

The invention discloses a special-purpose needled felt for complex condition coal fired power plants, which comprises a dust receiving surface, an auxiliary filter layer, an strengthen base cloth layer and a support layer which are orderly composited together by needling, wherein the dust receiving surface is blended by polyphenylene sulfite (PPS) fibers, polytetrafluoroethylene (PTFE) fibers and polyimide (PI) fibers according to proportion of 1:(0.2-0.5):(0.2-0.5), the auxiliary filter layer and the support layer are respectively needled by the PPS fibers, and the strengthen base cloth layer is interlaced by PTFE filament yarns in longitude and latitude. The invention further discloses a method for preparing the special-purpose needled felt for the complex condition coal fired power plants. The dust receiving surface is blended by the PPS fibers, the PTFE fibers and the PI fibers, thereby being low in cost, and increasing transverse and longitudinal strength of the special-purpose needled felt. Probability of intercept and filter precision of dust are increased through element felt preparation, immersion treatment, calendering processing and singeing process, thereby leading instantaneous using temperature of the special-purpose needled felt to increase and to be less affected by ozone, increasing oxidation resistance, prolonging service life, being further capable of improving strip ratio of the dust, increasing ventilation property of the special-purpose needled, and reducing operation energy consumption.

A PTFE fiber with a low density and having a network structure that allows effective performances to be given to its finished articles and a method for manufacturing the PTFE fiber are provided. The PTFE fiber is a filament obtained by giving a heat treatment to a biaxially stretched polytetrafluoroethylene (PTFE) film, followed by slitting partially in a lengthwise direction of the film. The filament includes a network structured fiber in which single fibers are opened partially in the width direction, and the filament is an aggregate of the single fibers. This fiber is manufactured as the filament by feeding a biaxially stretched PTFE film to a revolving pin roll with needles implanted thereon, the needles being arranged so that a plurality of rows run obliquely along a circumferential direction at substantially regular intervals, and slitting the film partially in a lengthwise direction. This PTFE filament may be cut into short fibers with a cutter. The short fibers include a branch structure.

The pleated filter bag, which can be used in a bag-house type dust collector, is elongated and has a longitudinal hollow center with an open end, and a pleated filter wall circumscribing the hollow center. The pleated filter wall has a felt such as PTFE fibers felted onto an apertured and pleatable scrim which can be made of metal, and having a permeability lower than a permeability of the scrim. A membrane of lower-permeability material, such as an E-PTFE membrane, covers the support felt on the outer side of the bag.

Unique PTFE fabric and laminate structures, and methods for making the same, are described. Particularly, the invention comprises a laminate of a fabric comprising a plurality of PTFE fibers overlapping at intersections, wherein at least a portion of the intersections have PTFE masses extending from at least one of the overlapping PTFE fibers, and which lock the overlapping PTFE fibers together, bonded to a membrane by at least said PTFE masses. Such reinforced membranes exhibit exceptionally high bond strength, a particularly valuable attribute in applications in which durability is important.

An article useful as an architectural fabric consisting of (a) a layer of fabric having a first surface and a second surface made of expanded polytetrafluoroethylene fibers that are densified or contain a filler or both; and (b) a fluoropolymer coating disposed on at least the first surface of the fabric.

The invention discloses a specific composite filter material for a coal-fired power plant electric bag integration project; the composite filter material comprises base cloth, a dust facing surface and a bottom layer; the dust facing surface is arranged on the upper surface of the base cloth; the bottom layer is arranged on the lower surface of the base cloth; the dust facing surface is mixedly blended from PTFE fibers and PPS fibers, wherein the weight proportion of the PTFE fibers is 30 to 70 percent; the base cloth is interwoven from 100 percent PTFE long filaments in the longitudinal and latitude directions; and the bottom layer is mixedly blended from the PTFE fibers and the PPS fibers, wherein the weight proportion of the PTFE fibers is 30 to 70 percent. The fibers tangle through an acupuncture and spunlace composite process to form a plain blanket which is soaked into chemical solvent, so as to further improve the corrosion resistance and chemical performance resistance. The specific composite filter material for the coal-fired power plant electric bag integration project has smooth surface, improves the dust removing capability, reduces the operation resistance of equipment, prolongs the service life, can ensure the use for 35000h in the electric bag integration project, and is applicable to the coal-fired power plant electric bag integration project.

The invention discloses a method and system for recovering PTFE (Polytetrafluoroethylene) fibers and PPS (Polyphenylene Sulfide) in a waste dust removing bag. The method comprises the following steps of carrying out hot-melting, namely, at a temperature of 250-260 DEG C, carrying out hot-melting on the waste dust removing bag until the PPS is completely melted; crushing, namely, crushing a cooled blocky hot-melted object into a mixture of powder, fibers and blocky solid matters; and screening, namely, screening the mixture, recovering the PTFE fibers and the PPS powder, and crushing the blocky solid matters. The method has the beneficial effects that the hot melting is preformed according to the difference of melting points of two materials, and the separation is performed according to the difference of physical properties so that the PTFE fibers and the PPS in the waste dust removing bag are recycled.

The invention relates to a preparation method of a nano fiber-needling PTFE base cloth filter material, and belongs to the technical field of electrospinning. The preparation method comprises the following steps: step 1, PTFE base cloth pretreatment; step 2, electrospinning; step 3, superfine nano fiber dispersion liquid preparation; and step 4, composite filter material soaking treatment. In the technical scheme provided by the invention, the PTFE base cloth is prepared by mixing PTFE fibers and PPS fibers, so, compared with the traditional glass fiber mat, the flexibility is better, and the spinnability and durability of the fiber material are relatively greatly improved; the service life is prolonged to 1-2 years compared with eight months of the common glass fiber mat base cloth; and the market prospect is wide.

An article useful as an architectural fabric consisting of (a) a layer of fabric having a first surface and a second surface made of polytetrafluoroethylene fibers; and (b) a fluoropolymer coating disposed on at least the first surface of the fabric.

The invention provides a preparation method of a filter material with denitration and dioxin-removal effects. The preparation method comprises the following steps: (1) after an active metal catalyst powder and PTFE resin powder are mixed, catalyst-containing PTFE fiber and a catalyst-containing PTFE micro-porous membrane are respectively prepared; (2) the catalyst-containing PTFE fiber and high-strength PTFE fiber are made into warp beams by a 1-10:1-10 alternate arrangement mode, and a PTFE base cloth layer is prepared by a weaving mode; (3) the catalyst-containing PTFE short fiber and a base material undergo composite acupuncture or spunlace on the surface of the PTFE base cloth layer so as to prepare a PTFE felt layer; (4) an active metal catalyst emulsion and a PTFE emulsion are mixed to prepare a catalyst mixed treating fluid, and the PTFE felt layer undergoes mass-impregnation treatment and then is sintered at 300-350 DEG C; and (5) the sintered PTFE felt layer and the catalyst-containing PTFE micro-porous membrane are simultaneously introduced into a hot laminator to undergo surface hot-press lamination processing. According to the invention, filtration accuracy and denitration and dioxin-removal efficiency can be enhanced remarkably.

The invention discloses a self-lubricating material and a preparation method thereof. The self-lubricating material is formed by compounding a sliding layer, a bonding layer and a supporting layer, wherein the sliding layer is a porous material containing PTFE fibers; the bonding surface of the supporting layer is first roughened; the bonding surfaces of the sliding layer and the supporting layerare treated with a coupling agent; and the bonding layer contains a coupling agent. The bonding layer is arranged between the sliding layer and the supporting layer, and the bonding layer bonds and compounds the sliding layer with the supporting layer together. The preparation method provided by the invention is simple and environmentally-friendly, and the prepared self-lubricating material has strong bonding between the sliding layer and the supporting layer, has excellent peeling strength, can better ensure the integrity of the self-lubricating material during use, reduces the possibility ofmaterial failure due to delamination of the sliding layer from the supporting layer, and is especially suitable for bearings, washers, sliding blocks and other components used under high load conditions.

An article having (a) a layer of fabric having a first surface and a second surface made of polytetrafluoroethylene fibers; and (b) a first composite comprising (i) a porous PTFE film having interconnected passages and pathways and (ii) a fluoropolymer adhesive, wherein said fluoropolymer adhesive is at least partially contained in said passages and pathways of said PTFE film, said first composite disposed adjacent to said first surface of said fabric,wherein the article passes a Newark Flex test after 10,000 cycles. In another embodiment, the invention includes a second composite comprising (i) a porous PTFE film having interconnected passages and pathways and (ii) a fluoropolymer adhesive, wherein said fluoropolymer adhesive is at least partially contained in said passages and pathways of said PTFE film, said second composite disposed adjacent to said second surface of said fabric. The article of the present invention is preferably waterproof, fire retardant, and flexible. It is also preferably an architectural fabric for retractable, temporary, or permanent structures and is adapted to be joined to itself by heat welding.

Composite bearings and methods for manufacturing these bearings are provided in which a lining comprising polytetrafluoroethylene fiber and a second fiberous material are disposed within a polymeric matrix comprising polytetrafluoroethylene particles and a wetting agent. The composite bearings may be useful in hydropower applications where self-lubricating bearings containing graphite are undesirable because graphite can be corrosive to carbon steel.

The invention belongs to the technical field of industrial dedusting application and particularly discloses a preparation technology of alkali-resisting PTFE (polytetrafluoroethylene) and PPS (polyphenylene sulfide) fiber blended needled felt. The preparation technology comprises following steps: step 1, fiber opening; step 2, fiber carding; step 3, lapping; step 4, needling compaction; step 5, postprocessing: (1), calendering; (2), singeing; (3), impregnation with an emulsion; (4), high-temperature setting; (5), film covering. The preparation technology of the alkali-resisting PTFE and PPS fiber blended needled felt has beneficial effects as follows: 1, a PTFE fiber+PPS fiber needled felt filter material is a filter material with a stereoscopic fiber structure, and the filter material isformed by covering two sides of base cloth with stereoscopically staggered PTFE fibers and PPS fibers respectively, compacting and fixing the base cloth and then needling the base cloth by a needlingmachine; 2, the needled felt filter material has a small bore diameter, low filtration resistance, good breathability and high dust capturing efficiency. The filtration efficiency can reach 99.99% orabove.