2635 results about "PTFE - Polytetrafluoroethylene" patented technology

The invention discloses a dry-method electrode film and a preparation method thereof, an electrode and a battery, and belongs to the technical field of batteries. The method comprises the following steps: mixing polytetrafluoroethylene, an active substance and a conductive agent, and crushing to obtain a crushed mixture; performing primary airflow grinding and shearing on the crushed mixture to obtain a ground and sheared mixture; the primary shearing conditions are as follows: the airflow temperature is-10 to 10 DEG C, the airflow pressure is 0.7 to 0.9 MPa, and the rotating speed is 8000 to 12000 rpm; carrying out secondary airflow grinding, shearing and fibration on the ground and sheared mixture to obtain a fibration material; and carrying out secondary fibration treatment on the fibration material to obtain the dry-method electrode film. The method can significantly improve the tensile strength of the electrode film, improve the liquid absorption rate of the electrode and reduce the resistivity of the electrode.

The invention provides an instant-penetration expanded polytetrafluoroethylene artificial blood vessel and a preparation method thereof. The preparation method comprises the following steps: mixing PTFE dispersion resin and lubricating oil with a first compression ratio, and curing to obtain a first PTFE mixture; mixing the PTFE dispersion resin with a second compression ratio and lubricating oil, and curing to obtain a second PTFE mixture, wherein the first compression ratio is higher than the second compression ratio; the first PTFE mixture is pre-pressed into a middle layer cylinder; pre-pressing the second PTFE mixture into an inner-layer cylinder and an outer-layer cylinder; the middle-layer cylinder is put into the outer-layer cylinder, the inner-layer cylinder is put into the middle-layer cylinder to obtain a composite cylinder, and the composite cylinder is subjected to blank pressing treatment to obtain a secondary blank pressing cylinder; and carrying out one-way stretching on the secondary compaction cylinder to obtain the instant-penetration expanded polytetrafluoroethylene artificial blood vessel which is not layered after being punctured.

The invention provides a self-repairing polyurethane film containing a disulfide bond and a DA bond and a preparation method thereof, and the preparation method comprises the following steps: (1) adding an organic solvent into a three-necked flask, then dissolving dihydric alcohol, diisocyanate, a disulfide bond monomer and a DA bond forming monomer in the organic solvent, then adding a catalyst, and mechanically stirring uniformly; (2) introducing nitrogen into the three-necked flask to evacuate air, setting a reaction temperature, and carrying out a reaction under mechanical stirring; (3) in a nitrogen environment, dropwise adding a monomer II forming a DA bond into the solution obtained after the reaction in the step (2), and after the dropwise addition of the monomer II forming the DA bond is completed, setting the reaction temperature and reacting for a period of time; and (4) pouring the solution obtained after the reaction in the step (3) into a polytetrafluoroethylene mold, and drying to obtain the self-repairing polyurethane film. The self-repairing polyurethane film prepared by the preparation method disclosed by the invention has relatively good mechanical properties, relatively good self-repairing performance under mild conditions and high self-repairing efficiency.

The invention discloses a low-creep polytetrafluoroethylene composite material and a preparation method thereof, the low-creep polytetrafluoroethylene composite material comprises the following raw materials by weight: 50-60 parts of polytetrafluoroethylene, 35-45 parts of perfluoroalkoxy resin, 15-25 parts of modified composite fiber, and 1-2 parts of a lubricant. Polytetrafluoroethylene and perfluoroalkoxy resin are blended according to a specific proportion to serve as a base material, a hot press molding process is matched, the core performance of the material is guaranteed, the molten perfluoroalkoxy resin can fully infiltrate and wrap the surface of the modified composite fiber under the driving of hot press pressure, and the performance of the composite fiber is improved. The composite material has the advantages that the composite material is high in mechanical strength, can form strong interface combination with PTFE (polytetrafluoroethylene) framework particles, can permeate and fill gaps of the PTFE framework particles, eliminates internal pores through a welding effect, and finally forms a highly-compact whole, so that the creep resistance of the composite material is remarkably improved.

The invention provides a thick electrode and a preparation method thereof, and a lithium battery, the thick electrode comprises a current collector and an active coating, the active coating comprises an active material, a conductive agent, a dispersant and a composite binder, the composite binder comprises a binder A and a binder B, the binder A comprises at least two of sodium carboxymethyl cellulose, a polyacrylic acid binder and an acrylonitrile multipolymer, and the binder B comprises at least one of polytetrafluoroethylene and butadiene styrene rubber. The thick electrode has the characteristics of stable structure, good conductivity and high ion transmission efficiency, and the cycling stability of the battery using the thick electrode can be improved.

The preparation method comprises the following steps: S1, mixing a hydrochloric acid solution with organic sodium sulfonate, then adding aniline and water, stirring and dissolving, then adding an oxidizing agent to carry out doping reaction, and carrying out suction filtration, washing, drying and grinding on a reaction product to obtain sodium-modified polyaniline; s2, uniformly mixing a negative electrode active material, a conductive agent and polytetrafluoroethylene, and then adding sodium polyaniline and an organic sodium supplement agent in a nitrogen or inert atmosphere for fibration treatment to obtain fibration powder; and S3, performing hot pressing on the fiberized powder onto the current collector to obtain the lithium ion battery. The prepared pre-sodium-modified negative electrode dry-method electrode has relatively good peeling strength and pole piece flexibility, and the condition that a traditional wet-method thick electrode is easy to crack is relieved; meanwhile, the dry-method electrode subjected to sodium modification treatment can induce uniform deposition of sodium ions, so that the dynamic performance of the whole sodium battery is improved, the problem of cyclic sodium precipitation is avoided, and the service life of the battery is further prolonged.

The invention discloses a broadband high-gain microstrip antenna, which is provided with a rectangular radiation patch, a symmetrical grooving parasitic patch, a dielectric substrate, a metal bottom plate and a polytetrafluoroethylene support column, the rectangular radiation patch and the symmetrical grooving parasitic microstrip are attached to the upper layer of the dielectric substrate; a certain distance is formed between the rectangular radiation patch and the slotted parasitic patch and is used for coupling electromagnetic waves; the upper dielectric substrate is provided with two through holes for feeding; the metal bottom plate and the upper-layer substrate are fixed through four polytetrafluoroethylene supporting columns; a space is reserved in the middle to form an air substrate; and an SMA interface is arranged below the floor. According to the microstrip patch antenna, the forms of differential feeding and parasitic patch adding are adopted, the high gain and broadband characteristics of the microstrip patch antenna are achieved, the profile of the antenna is kept within 0.1 lambda, and the unipolar radiation pattern is achieved while high performance is guaranteed. In addition, the antenna is relatively simple in technical structure and convenient for later processing, can be used as an array unit for arraying, and meets the requirements of modern communication.

The invention provides a preparation technology of a three-dimensional camera shooting sonar sparse sensing array, and the method comprises the following steps: forming a patterned electrode on a PVDF or P (VDF-TrFE) piezoelectric film through vacuum adsorption and silk-screen printing according to sparse array element coordinates, and arranging a virtual transition array element at the periphery; performing laser etching on the edge contour and the exhaust hole of the piezoelectric film; designing a bonding positioning auxiliary tool, combining an ultrathin double-sided adhesive tape and a single-sided mask adhesive tape, and utilizing conductive silver paste to realize accurate electric connection between the array element and the PCB bonding pad; designing a polytetrafluoroethylene-metal flattening module, and laminating the array in a vacuum environment for curing and bonding; the matching layer is made of a low-impedance sound transmission material, glue filling and vacuum defoaming are performed from the back side in batches, and the sparse sensing array is prepared in combination with a polyimide film and a metal super-flat plate. The preparation problem of the large-aperture high-frequency imaging sonar on the sensing array is solved, and the array element position accuracy, the array element consistency and the imaging resolution can be improved.

The invention discloses a polytetrafluoroethylene film with high tensile strength and a preparation process thereof, and relates to the technical field of polytetrafluoroethylene films. The preparation method comprises the following steps: step 1, preparing a composite raw material: S1-1, sequentially putting a tetrafluoroethylene copolymer into acetone and methanol to be soaked, washed and dried; dispersing in a glycidyl methacrylate-methanol solution, and carrying out irradiation grafting in a nitrogen atmosphere; filtering, washing and drying to obtain an epoxy tetrafluoroethylene copolymer; s1-2, sequentially putting an epoxy tetrafluoroethylene copolymer and a composite filler into tetrahydrofuran, stirring for 24-48 hours at the temperature of 70-75 DEG C in a nitrogen atmosphere, filtering, washing and drying to obtain a composite raw material; 2, mixing polytetrafluoroethylene, the composite raw material and carboxylated polyphenylene sulfide to obtain a mixture; performing cold press molding and temperature-controlled sintering to obtain a basic film; 3, the basic film is subjected to turning forming and continuous rolling, and the polytetrafluoroethylene film is obtained.

The invention discloses a high-performance polyether-ether-ketone plate and a preparation method thereof, and belongs to the technical field of semiconductor manufacturing. The high-performance polyether-ether-ketone plate comprises the following components in parts by weight: 80-90 parts of polyether-ether-ketone, 1-3 parts of carbon nanotubes, 1-3 parts of graphene nanosheets, 2-5 parts of conductive tin oxide micro powder, 3-5 parts of polytetrafluoroethylene micro powder and 0.5-1 part of a silane coupling agent. The PEEK composite material provided by the invention has excellent mechanical, conductive, heat management, corrosion resistance and antistatic properties, and is suitable for severe environments such as high temperature, corrosion and fatigue resistance.

The utility model discloses a bending-resistant radio frequency coaxial cable, which comprises an inner conductor, an insulating layer, a shielding layer and a sheath layer which are sequentially arranged from inside to outside, the inner conductor is formed by concentrically twisting a plurality of strands of silver-plated copper wire monofilaments; the insulating layer comprises an inner insulating layer and a polytetrafluoroethylene film outer insulating layer; the inner insulating layer is wrapped outside the inner conductor and is formed by sintering a polytetrafluoroethylene tape; the polytetrafluoroethylene film outer insulating layer is wrapped outside the inner insulating layer; the shielding layer comprises an inner shielding layer, a middle layer and an outer shielding layer, and the inner shielding layer is a silver-plated copper strip wrapping layer and wraps the insulating layer; the middle layer is a polyimide aluminum foil composite belt wrapping the inner shielding layer; the outer shielding layer is a silver-plated aramid yarn woven layer and is woven outside the middle layer; the sheath layer is a polytetrafluoroethylene sheath layer. The cable provided by the utility model has the characteristics of high-frequency bending resistance and good environment resistance, and also has excellent electrical transmission performance.

The invention provides a dry-method electrode film and a preparation method thereof, a dry-method electrode and a battery, and particularly relates to the technical field of secondary batteries. The dry-method electrode film comprises an active material, a conductive agent and a binder, the binder comprises a first binder and a second binder; the first binder is polytetrafluoroethylene; and the melting point of the second binder is less than 120 DEG C. A second binder is introduced in the electrode material mixing process, heat energy generated by mechanical mixing can soften the second binder, small particles are bonded together, the surface energy of the electrode material is improved, the agglomeration or mixing behavior of the electrode particles in the dry mixing process is driven, and a dry-method membrane with high strength and high adhesive force with a current collector is formed; and on the other hand, the second binder can be softened at a relatively low temperature in the hot-pressing compounding process of the current collector, and is compounded with the current collector more tightly, so that the peel strength between the electrode film and the current collector is optimized, and the cycling stability and the electrochemical performance of the battery are improved.

The invention relates to an electrofluid-driven deformable flexible fiber pump and a manufacturing method, the flexible fiber pump comprises a flexible pump body, a three-dimensional electrode module and an external voltage driving control unit, the flexible pump body is made of a thermoplastic plastic material, and the whole flexible pump body is of a hollow tubular structure; the three-dimensional electrode module comprises a polytetrafluoroethylene film and electrodes, and the electrodes comprise a positive electrode and a negative electrode; the polytetrafluoroethylene film is fused with the inner surface of the flexible pump body, the external voltage driving control unit is electrically connected with the positive electrode and the negative electrode, and the manufacturing method mainly comprises the steps of electrode printing, electrode winding and thermoplastic forming. Compared with the prior art, the electrode has the advantages that a planar electrode structure is converted into a three-dimensional structure through winding, so that the integration of the electrode is enhanced, and the application range of the three-dimensional electrode design is widened; and the shapes of the three-dimensional electrode module and the flexible pump body are fixed while heating, so that the electrode can adapt to the change of the shape of the pump, and the flexible deformation capability of the pump is improved.

A medical appliance or prosthesis may comprise one or more layers of rotational spun nanofibers, including rotational spun polymers. The rotational spun material may comprise layers including layers of polytetrafluoroethylene (PTFE). Rotational spun nanofiber mats of certain porosities may permit tissue ingrowth into or attachment to the prosthesis. Additionally, one or more cuffs may be configured to allow tissue ingrowth to anchor the prosthesis.

The invention relates to a modified binder for a dry-method electrode, a dry-method electrode pole piece and a preparation method of the dry-method electrode pole piece. Polycyclic aromatic hydrocarbon is dissolved in an aprotic polar solvent, alkali metal is added, and a polycyclic aromatic hydrocarbon alkali metal reagent is generated; and adding polytetrafluoroethylene into the polycyclic aromatic hydrocarbon alkali metal reagent to obtain the modified polytetrafluoroethylene. Alkali metal ions in the polycyclic aromatic hydrocarbon alkali metal reagent can destroy C-F bonds in the PTFE, remove some fluorine atoms on the surface of the PTFE and leave a carbonized layer and some polar groups such as hydroxyl groups, carbonyl groups and unsaturated bonds, and the groups can increase the surface energy, reduce the contact angle and improve the wettability, so that the cohesiveness of the modified PTFE is improved, and the service life of the PTFE is prolonged. The binding force between the PTFE and the conductive agent and the current collector is enhanced, and the problem that the viscoelasticity of the PTFE in the dry-method pole piece is insufficient is solved. Through modification, part of C-F bonds in PTFE are destroyed in advance, so that generation of interface side reaction products is reduced, the problem of initial effect reduction of a dry-method electrode is improved, and the cycle stability of a battery is improved.

The invention relates to the technical field of gas sensors, and particularly discloses an electrochemical formaldehyde sensor electrode, a preparation method thereof and an electrochemical formaldehyde sensor. The electrochemical formaldehyde sensor comprises an electrochemical formaldehyde sensor electrode and a binary electrolyte, the electrochemical formaldehyde sensor electrode comprises a polytetrafluoroethylene film, the polytetrafluoroethylene film is coated with slurry for an electrochemical formaldehyde sensor electrode; and the slurry is formed by mixing nano manganese dioxide, platinum carbon and a Nafion solution. According to the electrochemical formaldehyde sensor, the electrode prepared from the slurry formed by mixing the nano manganese dioxide, the platinum carbon and the Nafion solution has relatively high catalytic activity, so that the sensor shows extremely high sensitivity and extremely good linearity on formaldehyde, and the electrochemical formaldehyde sensor has relatively high catalytic activity by regulating and controlling the proportion of the binary electrolyte. The electrochemical formaldehyde sensor has the advantages of high sensitivity, low cost, fast response, high detection precision and the like.

The invention discloses a novel electrolytic tank pipeline filter and a self-cleaning system. The novel electrolytic tank pipeline filter comprises a multi-stage filtering part, the self-cleaning system and an intelligent control system, the multi-stage filtering part comprises multi-stage filter elements arranged in the material pipeline, and the multi-stage filter elements are arranged from large to small according to the filtering particle size to form a filtering gradient; the self-cleaning system acts on the multi-stage filter element part at the same time or in a time-sharing manner on the basis of a fluid reverse recoil principle; the self-cleaning system is combined with pulsating flushing control, so that the filter element is separated from a filter cake at low loss; the multi-stage gradient filtration is adopted, impurities are efficiently and accurately intercepted, the filter elements with the particle sizes from large to small are arranged in a gradient mode, the first-stage titanium alloy filter element intercepts large particles, the second-stage polytetrafluoroethylene membrane filters tiny impurities, the efficiency is improved through graded interception, the loss of the filter elements is reduced, and the material purity and the hydrogen production quality are guaranteed. The multi-element self-cleaning technology is adopted, low-loss deep cleaning is achieved, and the self-cleaning system integrates multiple technologies such as fluid reverse backflushing, pulsating flushing, ultrasonic vibration and a pulsed electric field.

The invention discloses a composite diaphragm, a preparation method thereof and a lithium ion battery. The composite diaphragm comprises a base membrane and a composite functional layer arranged on one side of the base membrane, and the composite functional layer is formed by compounding an independent high-temperature-resistant polymer porous membrane and a polytetrafluoroethylene porous membrane. Preferably, the high-temperature-resistant polymer porous membrane comprises one or more of an aramid fiber membrane and a polyimide membrane. By compounding the high-temperature-resistant polymer porous membrane and the polytetrafluoroethylene porous membrane, the overall thinning of the diaphragm is realized on the premise of ensuring excellent mechanical strength and thermal stability, and the ion migration impedance is effectively reduced, so that the rate capability, the cycle life and the safety performance of the lithium ion battery are remarkably improved.

The invention provides a lithium supplement composite layer and a preparation method thereof, a lithium supplement method, a pre-lithiated negative pole piece, a secondary battery and an electronic device, the lithium supplement composite layer comprises an interface layer and a lithium supplement layer which are laminated, the interface layer comprises interface particles and a binder, the interface particles comprise a lithium intercalation material and / or a conductive agent, and the binder comprises a lithium intercalation material and / or a conductive agent. The lithium intercalation material is selected from at least one of artificial graphite, natural graphite, hard carbon, a silicon-carbon material, a silicon-oxygen material, lithium titanate, tin and a tin-copper alloy, and the conductive agent is selected from at least one of conductive carbon black, carbon fiber, graphene and a carbon nanotube; the binder is selected from at least one of polytetrafluoroethylene, an ethylene-tetrafluoroethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, polyvinylidene fluoride and polyoxyethylene; the lithium supplementing layer comprises lithium metal and / or lithium alloy. The lithium supplement composite layer meets the above characteristics, lithium supplement is carried out on the negative pole piece, the first coulombic efficiency of the secondary battery can be improved, the cycle capacity attenuation is reduced, and the energy density of the secondary battery is improved.

The invention relates to the technical field of cable preparation, in particular to a preparation method of a cable for a quantum computer, which comprises the following steps: drawing a niobium-titanium alloy wire; extruding polytetrafluoroethylene to coat the outer surface of the niobium-titanium alloy wire to obtain an inner conductor with an insulating layer; performing niobium electroplating on the inner wall of the stainless steel tube to obtain a target cable; when it is judged that niobium plating of the outer conductor base material does not meet the preset standard according to the niobium plating uniformity characteristic value, the current density is reduced; penetrating the inner conductor with the insulating layer into a stainless steel tube meeting a preset standard, drawing the stainless steel tube to obtain a target cable, and secondarily judging whether the preparation of the target cable meets the preset standard or not when judging that the preparation of the target cable does not meet the preset standard according to the contact resistance evaluation value; determining a corresponding adjustment strategy according to the niobium-plated layer cracking characteristic value; and the target cable meeting the preset standard is wound and packaged, so that the preparation efficiency of the cable is improved.

The invention discloses a preparation method and application for directly growing CuCoO2 on foamed nickel, and the preparation method comprises the following steps: dissolving copper nitrate, cobalt nitrate and a mineralizer in a solvent, intensely stirring to form a suspension A, then transferring the suspension A into a high-pressure kettle, and carrying out vacuum drying to obtain CuCoO2; meanwhile, the foamed nickel is placed in a polytetrafluoroethylene flower basket and then placed in an autoclave to be heated for a hydrothermal reaction, and after the hydrothermal reaction is finished, the foamed nickel is cooled to the room temperature. According to the method, the CuCoO2 electrode with the foamed nickel substrate can be prepared in one step, compared with a method for preparing CuCoO2 powder and then transferring the CuCoO2 powder to an electrode plate, the needed time is short, operation is easy, the electrode material is uniform, and the method can be widely applied to related fields as an efficient photoelectric functional material electrode preparation method.

The utility model relates to the technical field of signal transmission cables, and discloses a novel insulation co-extrusion double-coaxial high-speed data transmission cable, which comprises conductors, an insulation layer, a shielding layer and a sheath layer, and is characterized in that the two conductors are parallel to each other and are arranged at an interval; the insulating layer is uniformly and tightly wrapped on the outer sides of the two conductors, is a polytetrafluoroethylene insulating layer, and is simultaneously extruded at one time, so that the insulating layer is pushed and wrapped on the outer sides of the two conductors; the shielding layer comprises a first shielding layer and a second shielding layer, the first shielding layer wraps the outer ring of the insulating layer, and the second shielding layer wraps the outer ring of the first shielding layer; the sheath layer wraps the outer ring of the second shielding layer and is used for fixing and shielding protection. The two conductors are stranded bare copper, tinned copper wires or silver-plated copper wires. The cable has more reliable mechanical and physical stability, is more beneficial to coupling of an electromagnetic field, can reduce capacitance impedance, has lower time delay difference, and improves signal transmission speed and quality.

The invention discloses a polytetrafluoroethylene ceramic membrane and a preparation method and application thereof, and the preparation method comprises the following steps: (1) adding polytetrafluoroethylene and a binder into water, and carrying out first mixing to obtain polytetrafluoroethylene slurry; adding a carbon nanotube and a dispersing agent into water, and carrying out secondary mixing, so as to obtain a carbon nanotube dispersion liquid; (2) carrying out third mixing on the carbon nanotube dispersion liquid and the polytetrafluoroethylene slurry to obtain a membrane preparation liquid; and (3) coating the surface of a ceramic support with the membrane preparation liquid, drying, and carrying out microwave sintering. The PTFE / ceramic composite membrane is prepared by microwave sintering, so that the sintering time and the production period are obviously shortened, and the production efficiency and the energy utilization rate of the product are obviously improved; the prepared PTFE / ceramic composite membrane is narrow in pore diameter and uniform in pore diameter distribution, has good hydrophobicity and oil-water separation performance, can effectively intercept 30-200nm nanoparticles, and has excellent anti-pollution capacity and stable separation performance for water-in-oil emulsions with different concentrations.

The invention belongs to the technical field of insulating materials, and particularly discloses an insulating material for an insulating soft sling for extra-high voltage working and a preparation method and application of the insulating material. The insulating material is prepared by mixing ZIF-8 particles and polytetrafluoroethylene powder according to a specific mass ratio and utilizing a dry process. And soaking and coating by using a polydimethylsiloxane (PDMS) solution to obtain a double-layer composite insulating material, and cutting and weaving to obtain the insulating soft sling. The high porosity and excellent gas adsorption performance of ZIF-8 and the insulating performance of PTFE and PDMS are combined, and the comprehensive performance of the insulating material is improved. The introduction of the ZIF-8 particles enhances the mechanical strength and the gas barrier property of the material, the PTFE and the PDMS provide good insulativity and corrosion resistance, and the synergistic effect of the PTFE, the PDMS and the ZIF-8 particles realizes the high-performance application of the insulating sling in a complex environment. Meanwhile, the preparation method and device are easy to operate and low in cost, and large-scale production can be achieved.

The utility model discloses a graphene carbon heat-conducting fin and reversible desiccant membrane combined membrane component for demisting an automobile lamp, a graphene carbon heat-conducting fin layer comprises a heat absorption area and a heat conduction area, the heat absorption area is arranged towards a heating element in the automobile lamp and is used for absorbing infrared heat, the heat conduction area is formed by extending from the heat absorption area to a cold area which is easy to fog, and the reversible desiccant membrane is arranged in the heat conduction area. The heat is exported for demisting; the reversible drying agent diaphragm layer is arranged in the heat conduction area and comprises a supporting framework layer, a functional layer and active filler; the support framework layer is an expanded polytetrafluoroethylene membrane with a microporous structure, the fog absorbent slurry forms a functional layer on the surface of the expanded polytetrafluoroethylene membrane, and the fog absorbent slurry is embedded into the microporous structure to form active filling. According to the utility model, heat generated by electrical elements in the automobile lamp is utilized to realize moisture absorption and desorption circulation of the reversible drying agent diaphragm, so that the fogging problem of a novel flat and long and narrow belt type automobile lamp is effectively solved, the structure is simple, and the cost is low.

The invention discloses a nitrogen-doped zinc ion battery manganese-based positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a strong oxidant and a manganese salt, putting the mixture into a beaker, adding deionized water, and uniformly stirring to form a mixed solution; transferring the mixed solution into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and heating the high-pressure reaction kettle in a drying oven; cooling, precipitating, filtering and washing for multiple times, and then putting into a drying oven for vacuum drying to obtain an original manganese-based positive electrode material; the preparation method comprises the following steps: respectively weighing an original manganese-based positive electrode material and hexamethylenetetramine, flatly laying the original manganese-based positive electrode material at the bottom of a lining of a reaction kettle, and putting the hexamethylenetetramine into a beaker; and putting the beaker into a reaction kettle, moving the beaker and the reaction kettle into a drying oven, and heating to obtain the surface nitrogen-doped manganese-based positive electrode material.

The invention discloses a polytetrafluoroethylene microporous membrane as well as a preparation method and application thereof, and belongs to the technical field of polytetrafluoroethylene microporous membranes. According to the invention, the polytetrafluoroethylene microporous membrane added with different amounts and different types of lubricants is prepared by a thermomechanical two-way stretching method, and the pore structure is researched. According to the invention, the entanglement density, the average pore size, the porosity, the hydrophobic property and the mechanical property can be regulated and controlled by changing the quantity and the type of the lubricant. And a new idea is provided for preparing the high-performance PTFE biaxially oriented film, and the method has a good application prospect.

The invention discloses a polytetrafluoroethylene compensator with good corrosion resistance and a preparation method thereof.The polytetrafluoroethylene compensator is composed of a corrugated pipe, a pipe connecting flange and an end flange, the pipe connecting flange and the end flange are located at the two ends of the corrugated pipe, the corrugated pipe is composed of a lining layer and a base material layer, and the base material layer is made of stainless steel; the preparation method comprises the following steps: firstly, carrying out surface grafting on nano aluminum oxide by using isocyanate silane, and introducing an active reaction group; then part of active groups react with benzotriazole, so that the corrosion inhibition and adhesion enhancement functions are realized; finally, enabling the residual active groups to react with hydroxylated polytetrafluoroethylene activated by alkali treatment, and coating a chemical inert layer on the surface of the residual active groups; the obtained core-shell structure functional filler is dispersed in epoxy resin to prepare a coating, and after the coating is coated on a stainless steel base material and cured, a high-performance compensator with high hardness, strong adhesive force, excellent corrosion resistance and weather resistance is formed.

The invention belongs to the technical field of membrane electrodes, and particularly relates to a hydrogen fuel cell catalyst layer slurry based on hydrophilic and hydrophobic regulation and a preparation method of a membrane electrode. The slurry of the catalyst layer comprises the following contents: the slurry of the PEM close to the cathode side comprises a Pt / C catalyst, deionized water, a perfluorosulfonic acid ionic polymer solution and isopropanol; the mass ratio, namely I / C ratio, of the ionic polymer to the carbon carrier is 0.8-1.2; the GDL cathode side slurry comprises a Pt / C catalyst, deionized water, a perfluorosulfonic acid ionic polymer solution, a PTFE aqueous solution (polytetrafluoroethylene aqueous solution) and isopropanol, and the mass ratio of the ionic polymer to the carbon carrier, namely I / C ratio, is 0.3-0.5. High hydrophilic ionomer content is reserved on the side, close to the cathode, of the PEM, proton conduction and catalyst active site wetting are guaranteed, the proportion of hydrophobic ionomers and hydrophobic materials is increased on the GDL side, a drainage channel is formed, liquid water is prevented from blocking gaps, then the performance of the membrane electrode is remarkably improved, and the interface contact resistance is stabilized to be 1.64-1.76 m omega (2.5 A / cm < 2 >).

The invention discloses a cleaning device for improving wafer surface cleanliness and a using method thereof, and relates to the technical field of semiconductor manufacturing, the cleaning device comprises a cleaning device main body, the bottom wall of the cleaning device main body is provided with a flushing liquid backflow assembly, and the flushing liquid backflow assembly comprises a liquid collecting tank installed on the bottom wall of the cleaning device main body; z-shaped filter plates which are arranged in a staggered manner are mounted in the liquid collecting tank; a first backflow pipe is installed on the back face of the liquid collecting tank in a penetrating mode, a third mixed-flow pump is installed at one end of the first backflow pipe, a second backflow pipe is installed at one end of the third mixed-flow pump, and a backflow box is installed at one end of the second backflow pipe in a penetrating mode; the bottom of the liquid collecting tank is inclined, the inner wall of the liquid collecting tank is made of polytetrafluoroethylene materials, and the inner wall of the liquid collecting tank is coated with a nanometer coating. By installing the flushing liquid backflow assembly on the bottom wall of the cleaning device body, the problems that in an existing cleaning device, the cleaning liquid recycling efficiency is low, impurity filtering is insufficient, the cleaning liquid waste treatment cost is high, and the environment is polluted can be solved.