980 results about "Polytetrafluoroethylene" patented technology

The invention provides an easy-to-scale efficient biological magnetic separation system and method and application. The magnetic separation method comprises the following steps: marking a target object in a to-be-detected suspension by adopting magnetic nanoparticles, and putting the marked to-be-detected suspension into a separation container; a modularized magnet array is arranged in the separation container, the modularized magnet array is composed of permanent magnets, and the permanent magnets are assembled into the cuboid modularized magnet array; the surface of the permanent magnet is coated with a polytetrafluoroethylene coating; the modularized magnet array moves in the suspension under the control of a driving magnet arranged outside the separation container to generate a dynamic gradient magnetic field, and a target object is captured by the modularized magnet array under the action of the gradient force of the magnetic field; removing the liquid in the separation container; adding the resuspension into a separation container, and recovering a target object by physical ultrasonic washing; or adding a chemical dissociation solution into the separation container to recover the target object.

The invention relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

The invention relates to the technical field of cable manufacturing, and discloses a heat preservation frost crack prevention cable which comprises a conductor, an insulating layer and a double-layer co-extrusion functional sheath wrapping the outer side of the insulating layer, and the sheath is composed of a cold-resistant stable layer and a water stop gate layer which are arranged in sequence; nano silicon nitride dispersion liquid is added into the cold-resistant stable layer, polytetrafluoroethylene micro-powder is added into the water stop gate layer, and the nano silicon nitride dispersion liquid and the polytetrafluoroethylene micro-powder form a double protection system of physical blocking and structural supporting, so that interlayer bonding force is strengthened, interlayer gaps are reduced, and a moisture invasion path is blocked. The preparation method comprises the steps of raw material pretreatment, conductor cleaning and drying, insulating layer extrusion, plasma activation, double-layer co-extrusion and finished product drying. The cable solves the problem that a multi-layer sheath of an existing cable is prone to frost heaving cracking due to water infiltration, the frost heaving damage resistance is remarkably improved, the cable is suitable for the high-cold and high-humidity environment, and stable power transmission is guaranteed.

The invention discloses a self-suspension ultrahigh-intensity pressure activated phase change sealing capsule for micro-leakage control and a preparation method thereof, and belongs to the technical field of leaking stoppage materials. The preparation raw materials comprise the following components in parts by weight: 50-100 parts of latex, 50-150 parts of water, 5-20 parts of an activating agent, 5-20 parts of a crystal phase change nano reinforcing agent, 5-20 parts of a defoaming agent, 1-10 parts of nano metal oxide, 0.5-5 parts of an anti-scorching agent, 0.5-5 parts of an accelerant and 50-150 parts of a terminating agent. The crystal phase change type nano reinforcing agent comprises at least one of polytetrafluoroethylene, polyvinylidene fluoride and a copolymer of the polytetrafluoroethylene and the polyvinylidene fluoride. The obtained phase-change sealing capsule is high in plugging speed, easy and convenient to construct, low in cost and high in plugging strength, can be applied to rapid repair and control of underground tubular column micron-scale to millimeter-scale crack leakage, and solves the problems that the plugging and repairing work flow is complex, the period is long, the cost is high, the risk is large, the one-time plugging success rate is low, and hidden dangers are difficult to eradicate.

The invention relates to the technical field of polymer functional material processing, and particularly discloses a polyethylene waterproof breathable film using PTFE micro powder as an opening agent and a preparation method of the polyethylene waterproof breathable film. The waterproof breathable film is prepared from the following components in parts by weight: 50-70 parts of linear low-density polyethylene, 10-40 parts of PTFE (Polytetrafluoroethylene) micro powder, 3-8 parts of a modified compatilizer and an auxiliary agent. The preparation method comprises the following steps: S1, activating PTFE micro-powder by a silane coupling agent and coating the PTFE micro-powder with polyethylene wax to obtain modified micro-powder; s2, uniformly mixing all the components; s3, carrying out melt extrusion at 180-210 DEG C through a double-screw extruder, and carrying out tape casting to form a cast sheet; s4, the casting piece is heated to 90-115 DEG C for two-way stretching, and micropores are formed through interface stripping between the PTFE particles and the base body; and S5, carrying out heat setting at 120-130 DEG C, cooling, and rolling to form the film. Through the synergistic effect of the self-made compatilizer and the pretreatment process, the interface anchoring force is enhanced, the problems of powder falling and water leakage of highly-filled PTFE are solved, and meanwhile, high moisture permeability, high hydrostatic pressure resistance and high mechanical property are taken into account.

The invention discloses a nickel-cobalt-selenium (Co1-xNixSe2) nano material for electrocatalytic oxidation of ethylene glycol as well as a preparation method and application of the nickel-cobalt-selenium (Co1-xNixSe2) nano material. The material is prepared by a hydrothermal method which comprises the following steps: (1) pouring 20mL of deionized water containing 475.9 mg of CoCl2. 6H2O into a 1mol / L NaOH solution containing 0.32 g of selenium powder to prepare a precursor solution; (2) placing in a stainless steel autoclave with a polytetrafluoroethylene lining, carrying out hydrothermal reaction at 180 DEG C for 18 hours, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying at 60 DEG C to obtain a CoSe2 material; and (3) the molar feeding ratio of CoCl2. 6H2O to NiCl2. 6H2O is adjusted, so that the nickel / cobalt ratio x is 0.25, 0.50 or 0.75, and materials with different components, namely Co < 0.75 > Ni < 0.25 > Se < 2 >, Co < 0.50 > Ni < 0.50 > Se < 2 > and Co < 0.25 > Ni < 0.75 > Se < 2 >, are prepared. The series of materials are applied to ethylene glycol oxidation under the alkaline condition, the catalytic performance of Co < 0.50 > Ni < 0.50 > Se < 2 > is optimal, the current density reaches 111 mA cm <-2 > under the electric potential of 1.6 V vs.RHE, the total Faraday efficiency reaches up to 91.4%, and the application prospect in the field of PET plastic recovery is wide.

The invention discloses a waste sulfuric acid treatment method and device, the device comprises a sintered filter element filter, a fine filtration coalescer, an adsorption tank and a membrane separator which are connected in sequence, and the fine filtration coalescer adopts a ceramic membrane tube or a polytetrafluoroethylene membrane tube or a silicon carbide lining membrane tube as a filter material; an adsorption material in the adsorption tank is one or a combined adsorption material of more than two of activated carbon, a modified molecular sieve, a metal organic framework material and a nano adsorption material; and the membrane separation system adopts one or a combined membrane of more than two of an ultrafiltration membrane, a reverse osmosis membrane and an electrodialysis membrane. The alkylation waste acid regeneration process can be simplified, the occupied area of the device is saved, the engineering investment is reduced, and the operation cost is greatly reduced compared with that of an existing process technology; according to the method, a physical separation means is adopted, organic polymeric oil, dissolved organic matters, dissolved salts and other impurities in the alkylated waste sulfuric acid can be effectively removed without decomposing and reconstructing the waste sulfuric acid, and the concentrated sulfuric acid after concentration completely meets the production requirements of an alkylation device.

The invention provides a composite antifouling system coating as well as a use method and application thereof. The coating sequentially comprises a bottom layer, a copper-containing middle layer and a surface layer in the direction from near to far away from a base material, wherein the copper-containing middle layer comprises 20-30 parts of self-polishing acrylic silicon resin, 5-10 parts of lime rosin, 8-12 parts of zinc oxide, 30-50 parts of cuprous oxide, 2-3 parts of a compound antifouling agent, 0.5-1 part of a thixotropic agent and a first diluent. The surface layer is prepared from 30 to 35 parts of caprolactone and lactic acid grafted linear polyester, 5 to 10 parts of highly hydrolyzed N-(hydroxymethyl) acrylamide (NMA) modified acrylic resin, 15 to 20 parts of copper-free organic antifouling agent, 5 to 12 parts of polytetrafluoroethylene micro powder, 2 to 3 parts of dispersing agent and second diluent. The high-hydrolysis copper-free surface layer forms an isolation barrier, so that the copper-containing middle layer is prevented from being in direct contact with air, and the problem that the antifouling efficiency is reduced due to the fact that water is not discharged for a long time after coating is solved; the stable hydrolysis rate of the surface layer resin can ensure the continuous release of the organic antifouling agent, and the copper-containing intermediate layer can provide deep antifouling guarantee and synergistically realize long-acting antifouling.

The invention relates to the technical field of manufacturing of fusible polytetrafluoroethylene resin, in particular to a method for treating an unstable terminal group of fusible polytetrafluoroethylene, which is used for solving the problem that the unstable terminal group cannot be thoroughly treated in the prior art. The method comprises the following steps: heating fusible polytetrafluoroethylene resin to a molten state, after self-reaction, introducing high-purity fluorine-nitrogen mixed gas to carry out fluoridation reaction, and extracting impurities generated by the reaction to obtain unstable soluble polytetrafluoroethylene resin with a treated terminal group; according to the method, soluble polytetrafluoroethylene resin is heated to a molten state, and unstable terminal groups are thoroughly treated through self-reaction and fluorination reaction.

The invention provides a hydrophilic modified polytetrafluoroethylene oil removal film and a preparation method thereof. A modified layer of the hydrophilic modified polytetrafluoroethylene oil removal film is mainly prepared from the following raw materials in percentage by mass: 8-12 wt% of a hydrophilic vinyl monomer, 0.3-0.6 wt% of a cross-linking agent, 0.2-0.5 wt% of an initiator and the balance of a deionized water solvent. A new chemical grafting modification strategy is adopted, the surface of the PTFE membrane is activated through low-temperature plasma, co-grafting and cross-linking polymerization of a hydrophilic monomer and a cross-linking agent on the surface of the PTFE membrane are initiated, and a layer of firm hydrophilic polymer brush with a three-dimensional network structure is constructed on the surface of the membrane; a stable hydration layer is formed on a membrane-water interface, the PTFE membrane is endowed with excellent underwater super-oleophobic property, the oil-water separation efficiency, flux and anti-pollution capacity of the PTFE membrane are remarkably improved, the technological process is simple, and the product performance is stable.

The invention discloses a waste sulfuric acid treatment method and system. The system comprises a sintered filter element filter, a fine filtration coalescer, an adsorption tank, a gas stripping tower, an alkaline washing tower, a molecular sieve dehydration device and a gas medium heating facility, a ceramic membrane tube or a polytetrafluoroethylene membrane tube or a silicon carbide lining membrane tube is adopted as a filter material of the fine filtering coalescer; an adsorption material in the adsorption tank is one or a combined adsorption material of more than two of activated carbon, a modified molecular sieve, a metal organic framework material and a nano adsorption material. The alkylation waste acid regeneration process can be simplified, the occupied area of the device is saved, the engineering investment is reduced, and the operation cost is greatly reduced compared with that of an existing process technology; a physical separation means is adopted, organic polymeric oil, dissolved organic matter, dissolved salt and other impurities in the alkylation waste sulfuric acid can be effectively removed without decomposing and reconstructing the waste sulfuric acid, and the concentrated sulfuric acid after concentration completely meets the production requirements of an alkylation device.

The invention relates to the technical field of films, in particular to a preparation method and application of a waterproof and oil-proof ventilation valve for food packaging. The preparation method comprises the following steps: carrying out plasma activation treatment on the porous polytetrafluoroethylene-based membrane; preparing fluoroalkyl silane modified silicon dioxide nano particles; preparing fluorine-containing organic silicon-silicon dioxide sol containing vinyl; a cross-linking layer is constructed through vacuum impregnation; preparing a hydrophilic / hydrophobic comonomer solution; copolymerized chain grafting is initiated by ultraviolet light; and water-based fluorocarbon emulsion is sprayed on the surface for curing. The obtained breather valve has super-hydrophobic and oleophobic characteristics, keeps high air permeability and high water vapor permeability at the same time, has the air permeability retention rate exceeding 95% after 10 times of moist heat sterilization, and is suitable for balancing internal and external pressure and blocking water and oil phase liquid permeation in the high-temperature and high-pressure sterilization process of a food packaging container.

The invention belongs to the technical field of medical materials, and particularly relates to an oral liquid film-covered rubber plug and a preparation method thereof.The oral liquid film-covered rubber plug is characterized in that vulcanized halogenated butyl rubber serves as a base material piece, a functional film is bonded to the surface of the base material piece through a hot-pressing composite technology, and the functional film is prepared by taking ethylene-vinyl acetate copolymer with the VA mass ratio being 28-33% as a base material layer; an ethylene-vinyl acetate copolymer with the mass ratio of VA being 18-22% is used as a transition layer, and polytetrafluoroethylene or high-density polyethylene is used as a functional layer. The novel laminated rubber plug with excellent sealing performance, chemical stability and sterilization compatibility is prepared by utilizing a gradient composite structure and a multi-step process optimization technology, and the laminated rubber plug is simple in preparation method, easy to process and form and wide in application prospect.

The utility model discloses a zinc oxide collection system bottom discharge device relates to material conveying technical field, including the fixed installation in the bottom of the collecting system's material hopper's discharge chute, both ends of discharge chute are installed with end bearing assembly respectively, and the common installation of two end bearing assembly is the discharge axle, is fixed with spiral discharge vane on the discharge axle in discharge chute, at least one intermediate bearing seat is fixedly installed in discharge chute, and the bearing cylinder of polytetrafluoroethylene material is fixedly arranged on intermediate bearing seat, and the discharge axle passes bearing cylinder, and is equipped with the material pass -through of intermediate bearing seat. The utility model reduces structure abrasion, is favorable to reducing maintenance frequency and maintenance cost, and reduces iron impurity incorporation, is favorable to reducing magnetic separation processing cost.

The invention provides a wear-resistant coating and a preparation method thereof, relates to the technical field of air bearings, and solves the technical problems that an existing air bearing coating is large in friction coefficient, insufficient in high temperature resistance, large in wear-resistant weight loss value and incapable of meeting the requirement for long start-stop service life. According to the wear-resistant coating, alcohol-soluble silane resin and high-temperature-resistant resin in a specific proportion are used as binder matrixes, lubricating wear-resistant fillers such as molybdenum disulfide and polytetrafluoroethylene are compounded, and a solvent and assistant system is optimized. The coating provided by the invention has the characteristics of low friction, high wear resistance and high temperature resistance, and can meet the use requirements of the air bearing under severe working conditions.

The invention discloses an insulating boron nitride heat-conducting gasket and application thereof, and belongs to the technical field of heat-conducting materials. The preparation method comprises the following steps: S1, preparing boron nitride powder, a volatile organic solvent and silica gel into a BN dispersion liquid; s2, coating a substrate with the dispersion liquid; s3, drying the wet film to obtain a BN film; s4, the BN film is torn down and cut into BN thin strips; s5, the BN thin strips are flatly laid in the polytetrafluoroethylene grooves to be fixed; s6, addition type silica gel is injected into the groove to be cured, a primary BN sheet is formed, and the primary BN sheet is repeatedly prepared; s7, coating addition type silica gel on the upper surface and the lower surface of each primary BN sheet, stacking the primary BN sheets into a mold, and pressing and curing the primary BN sheets to form a BN block; and S8, cutting the BN block along the direction perpendicular to the arrangement direction of the BN thin strips to obtain the insulating boron nitride heat-conducting gasket. The insulating boron nitride heat-conducting gasket has the excellent properties of high orientation degree, high heat conductivity, controllable structure, stable performance, excellent insulativity, flexibility and the like.

The application relates to the technical field of metal organic thin layer material preparation, in particular to a kilogram-level preparation method of metal organic thin layer material. The preparation method comprises the following steps: S1, adding zirconium tetrachloride and H2BPYDC into a polytetrafluoroethylene reaction kettle, dissolving the zirconium tetrachloride and the H2BPYDC, and then adding a composite; S2, sequentially adding a DMF solution of palladium fluoroacetate, a catalyst and concentrated hydrochloric acid into the reaction kettle; S3, transferring the reaction kettle into an oven, centrifuging to obtain a cyan suspension after 18-20 hours, dispersing the cyan suspension in a DMF solution in batches at 60 DEG C, placing for 5-6 hours, removing unreacted substrates, and obtaining a solid; S4, cleaning the solid obtained in S3 by using DMF and tetrahydrofuran respectively, and vacuum drying for 12 hours to obtain the metal organic thin layer material. The kilogram-level preparation method of metal organic thin layer material is provided, so as to solve the problems of low preparation yield, slow rate and difficulty in kilogram-level preparation of metal organic thin layer material in the related art.

The invention discloses an electrochemical oxygen sensor and a diaphragm material selection method and a detection result intelligent compensation method thereof. The electrochemical oxygen sensor comprises a shell, a measuring cavity is formed in the shell, a pressure adjusting cavity is formed in the position, below the measuring cavity, of the shell, and a buffer diaphragm is arranged between the pressure adjusting cavity and the measuring cavity; a barrier film is arranged between the pressure adjusting cavity and the outer part of the shell, so that the detection accuracy of the electrochemical oxygen sensor under a pressure change environment condition is improved; the buffer diaphragm is preferably made of polytetrafluoroethylene; a detected oxygen signal value is corrected according to a high-precision temperature measurement result after temperature sensing and intelligent compensation in combination with a preset temperature-compensation coefficient corresponding algorithm, the technical problems that traditional temperature compensation depends on a hardware circuit and is low in precision and poor in adaptability are solved, and the high-precision and intelligent temperature compensation effect is achieved.

The utility model discloses corrugated paper with a flame-retardant effect, which comprises a corrugated paper body, the corrugated paper body comprises core paper, surface paper is arranged at the top of the core paper, an upper flame-retardant layer is arranged at the top of the surface paper, the upper flame-retardant layer comprises a tungsten carbide coating and an aluminum oxide coating, bottom paper is arranged at the bottom of the core paper, and a flame-retardant layer is arranged at the bottom of the bottom paper. A lower flame-retardant layer is arranged at the bottom of the bottom paper and comprises a polyvinyl chloride coating and a polytetrafluoroethylene coating, the tungsten carbide coating is coated at the top of the surface paper, the aluminum oxide coating is coated at the top of the tungsten carbide coating, and the thickness of the tungsten carbide coating is the same as that of the aluminum oxide coating. The upper flame-retardant layer is arranged, the aluminum oxide coating contained in the upper flame-retardant layer can be used for carrying out first-layer flame-retardant protection treatment on the surface paper, and the tungsten carbide coating can be used for carrying out second-layer flame-retardant protection treatment on the surface paper after the aluminum oxide coating is damaged, so that the overall fire resistance of the surface paper is effectively improved.

The invention relates to the field of high polymer material processing, in particular to a preparation method of a large-size polytetrafluoroethylene filled hydraulic product. The preparation method comprises the following steps: 1) mixing polytetrafluoroethylene resin and copper powder, and filling a mold with the mixture to form an inner bag; packaging the inner bag with a rubber pocket to form an outer bag; the mass percentage of the polytetrafluoroethylene resin accounts for 10-90% of the total mass of the polytetrafluoroethylene resin and the copper powder; (2) the outer bag is vacuumized and then subjected to pressure treatment, and a hydraulic blank is manufactured; the pressing treatment comprises treatment under first pressure and then treatment under second pressure, and the second pressure is larger than the first pressure; 3, the hydraulic blank is subjected to standing and then sintered. According to the preparation method, the strength of the polytetrafluoroethylene hydraulic product can be effectively improved by controlling the mixing proportion of the polytetrafluoroethylene resin and the copper powder in the preparation process of the polytetrafluoroethylene filled hydraulic product, the pressure and the pressure applying method.

The application discloses a homopolymolybdate hybrid resistive random access memory material based on a tetraphenylstyrene molecule and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a mixture of 0.05 mmol of homopolymolybdate and 0.1 mmol of the tetraphenylstyrene molecule in 10 mL of water, stirring for 2 hours, adjusting the pH to 5.0 by using HCl to obtain a mixed solution; moving the mixed solution into a 25 mL stainless steel reaction kettle lined with polytetrafluoroethylene, reacting at 160 DEG C for 3 days, and obtaining a colorless block crystal after cooling; and after filtration, washing and drying, the homopolymolybdate hybrid resistive random access memory material based on the tetraphenylstyrene molecule is obtained. The method is simple and easy to operate, raw materials are easy to obtain, and the method is easy to realize. No harmful product is generated in the preparation process, and the method is an environment-friendly green synthesis. A multi-level controllable memory storage material is prepared, and the material can be applied to a multi-level memristor.

The invention belongs to the technical field of high polymer materials, and particularly relates to a low-friction machinable fluorine-containing composite material as well as a preparation method and application thereof. The middle-low friction machinable fluorine-containing composite material is prepared from the following raw materials in percentage by mass: 80-95% of fusible polytetrafluoroethylene and 5-20% of filler, the filler comprises any one or more of graphite, carbon fiber and polytetrafluoroethylene (PTFE). The low-friction machinable fluorine-containing composite material provided by the invention has low friction coefficient and high compression strength at the same time.

The present invention relates to a polycarbonate composition comprising the following components, relative to the total weight of the composition A) 63-81 wt. % of an aromatic polycarbonate,B) 13-20 wt. % of a phosphorus flame retardant,C) 4-12 wt. % of impact modifiers containing 1-7 wt. % of a first impact modifier and 1-7 wt. % a second impact modifier, wherein the first impact modifier is acrylonitrile-butadiene-styrene, and the second impact modifier is selected from methyl methacrylate-butadiene-styrene and silicone-acrylic rubber based impact modifiers,D) 1-6 wt. % of a mineral filler, andE) 0.05-0.09 wt. % of polytetrafluoroethylene.The present invention also relates to a shaped article made from the composition. The polycarbonate composition according to the present invention has a good combination of flame retardancy and impact strength.

The utility model relates to the technical field of expansion riveting nuts, and discloses an anti-skidding expansion riveting nut with an anti-skidding structure, which comprises an assembly main body, an anti-skidding gasket is assembled on the outer side of the assembly main body, the assembly main body comprises an expandable sleeve, and the bottom end of the expandable sleeve is fixedly connected with an internal thread bushing. The anti-skid gasket comprises a set of arc-shaped assembly rings connected to the upper end of the outer side of the expandable sleeve in a sliding and sleeving mode, and a plurality of notch grooves are formed in the annular outer side wall of the expandable sleeve at equal angles. According to the utility model, the optimized anti-skid structure design is adopted, the anti-skid gasket is arranged at the upper end of the expandable sleeve, and the anti-skid coating, namely the polytetrafluoroethylene coating, is arranged on the outer side of the anti-skid gasket, so that not only can the friction force be increased, but also a certain anti-corrosion effect can be achieved; and the top end of the anti-skid gasket is fixedly connected with a plurality of anti-skid convex blocks at equal angles, so that the friction force between the nut and a connected piece is improved, and the anti-skid effect of the whole anti-skid expansion riveting nut is enhanced.

The large-swing high-performance sealing device comprises a shaft piece, a shaft sleeve is fixedly sleeved outside the shaft piece, a kettle opening flange is sleeved outside the shaft sleeve at intervals, and more than two groups of sealing assemblies are stacked between the shaft sleeve and the kettle opening flange along the axial direction; each single sealing assembly comprises a ring seat, an outer sealing ring is pressed between the outer circumferential wall surface of the ring seat and the kettle opening flange, a gap is formed between the inner circumferential wall surface of the ring seat and the shaft sleeve, a polytetrafluoroethylene ring is coaxially pressed on the end surface of the ring seat, and the inner wall surface of the polytetrafluoroethylene ring is tightly attached to the outer wall surface of the shaft sleeve; the gas storage ring is assembled between the two sealing assemblies and is coaxially arranged, a gas nozzle which outwards penetrates through the kettle opening flange and is communicated with an external gas source is assembled on the gas storage ring, a gap is formed between the inner circumferential wall surface of the gas storage ring and the shaft sleeve to form a gas storage space, and gas is stored into the gas storage space through the gas nozzle to form a gas layer; in actual use, the inner wall face of the polytetrafluoroethylene ring is attached to the shaft sleeve and combined with the gas layer to form sealing between the shaft sleeve and the kettle opening flange, gas isolation can be guaranteed, and the sealing structure is particularly suitable for the using situation of a large-swing enamel shaft.

The utility model relates to the technical field of stirring devices, and discloses a PTFE (Polytetrafluoroethylene) film raw material stirring device which comprises a stirring tank, the stirring tank is provided with a powdering mechanism, the powdering mechanism comprises a dust suction pipe, a feeding pipe, an auger conveying structure for feeding dust into the feeding pipe, and a dust suction fan for feeding the dust into the auger conveying structure along the dust suction pipe, and the feeding pipe is provided with a self-sealing structure. By means of the technical scheme, the problem that in the related technology, liquid easily overflows the powder adding opening, and consequently the follow-up powder adding work is affected is solved.

The invention belongs to the technical field of polymer composite material preparation, and particularly relates to a polytetrafluoroethylene composite material and a preparation method thereof, the preparation method comprises the following steps: S1, reinforcing phase pretreatment: S11, potassium magnesium titanate whiskers and potassium titanate whiskers are mixed, an ethanol solution of a silane coupling agent is added, mixing and drying are performed, and modified double whiskers are obtained; s12, adding nano-montmorillonite into deionized water, carrying out ultrasonic dispersion, adding a cationic surfactant, stirring, carrying out centrifugal separation, and drying to obtain organic modified nano-montmorillonite; s13, soaking the short carbon fibers in a nitric acid solution, refluxing, washing to be neutral, and drying to obtain surface hydroxylated short carbon fibers; s2, preparation of a composite emulsion: adding deionized water into a reaction kettle, sequentially adding the materials, and performing stirring and ultrasonic dispersion to form a uniform reinforced phase dispersion liquid; then adding a surfactant and an initiator, and stirring; s3, carrying out polymerization reaction; and S4, carrying out post-treatment.

This utility model discloses an elastic quick-drying athletic trousers, comprising a trouser body with four parts: waistband, crotch, hips, and legs. The trouser body uses a composite fabric structure, including an outer layer, a middle layer, and an inner layer. The outer layer is a high-count worsted wool and nylon blend fabric; the middle layer is a microporous breathable membrane made of polytetrafluoroethylene (PTFE); and the inner layer is a quick-drying fabric made of a polyester and spandex blend. A breathable mesh fabric, also made of polyester fiber, is sewn and stitched into the crotch area. This utility model utilizes a composite fabric, with the spandex in the inner layer providing excellent elasticity. The elastic waistband and three-dimensional tailoring design allow for free movement and a comfortable fit. The breathable mesh in the crotch and the quick-drying inner layer quickly wick away sweat, keeping the wearer dry and comfortable, effectively enhancing the wearing experience.

The invention relates to a sealing material and a decoloring kettle applied to intermediate synthesis, and belongs to the technical field of composite materials. The compatilizer with a phosphoric acid structure is prepared, the compatilizer is used for treating and modifying the aluminum filler, a quaternary ammonium salt structure and a long-chain alkyl structure are introduced to the surface of the modified aluminum filler, the quaternary ammonium salt structure can generate electrostatic attraction with sulfonic acid groups in perfluorosulfonic acid resin, and the long-chain alkyl structure can generate long-chain alkyl groups in the perfluorosulfonic acid resin; the long-chain perfluoroalkyl structure can be entangled with a polytetrafluoroethylene resin molecular chain, and the two effects are synergistic, so that the binding capacity of the aluminum filler and the polytetrafluoroethylene-perfluorosulfonic acid resin composite material is effectively improved, and a polytetrafluoroethylene phase and a perfluorosulfonic acid resin phase can be bridged; the overall mechanical property of the composite material is effectively improved.

The utility model relates to the technical field of paint spraying devices, in particular to an energy-saving spray gun. The spray gun comprises a spray gun body, a mounting shell is arranged on the outer side of a nozzle of the spray gun body, a detachable anti-scattering cover is arranged on the mounting shell, a mounting rod is arranged below the front face of a grab handle of the spray gun body, a first C-shaped clamping ring is arranged at the front end of the mounting rod, and the first C-shaped clamping ring is matched with a second C-shaped clamping ring to clamp a residual paint collecting tank. Connecting lugs are symmetrically arranged on the two sides of the first C-shaped clamping ring and the two sides of the second C-shaped clamping ring, and every two attached connecting lugs are fixed through a bolt set. Through the detachable anti-scattering cover on the mounting shell on the outer side of the nozzle of the spray gun main body, atomized paint can be effectively prevented from scattering all around, during paint spraying operation, the atomized paint is intercepted by the anti-scattering cover and falls onto the inner wall of the anti-scattering cover, and due to the non-sticky characteristic of a polytetrafluoroethylene material, paint liquid is gathered and flows into the recovery tray and then enters the residual paint collecting tank, so that the residual paint is recovered. Waste caused by scattering of the paint is greatly reduced, the production cost is reduced, and the purpose of saving energy is achieved.