589results about How to "Good electromagnetic shielding" patented technology

The invention discloses a polymer-matrix electric conduction gradient function material and a preparation method thereof. The content of electric conduction filler in the prepared polymer-matrix electric conduction gradient function material shows continuous gradient change along the thickness direction of the material from low to high, and the performance also changes correspondingly. The preparation of the material mainly uses rheology principle to realize the gradient of distribution of material components by controlling and influencing thermodynamic factor and dynamic factor in the deposition process.

The present invention is the preparation process of electrostatic spun chitosan/carbon nanotube film, and belongs to the field of antibiotic and antistatic material preparing technology. The preparation process includes the following steps: dissolving carbon nanotube in acid mixture to compound solution, heating the solution to boil, filtering, washing to weak acid and vacuum drying; dissolving chitosan inside glacial acetic acid solution to obtain yellowish glacial acetic acid solution of chitosan; mixing the carbon nanotube solution and the chitosan solution to obtain molecule level composite solution; mixing the molecule level composite solution with glacial acetic acid solution of PVA; and spinning. The preparation process is simple, and the obtained electrostatic spun chitosan/carbon nanotube material has high solubility, good filming performance, high conductivity, excellent antibiotic performance and excellent electromagnetic shielding performance.

The invention discloses an indoor track type intelligent patrolling robot system based on a combined track. The system comprises the combined track and a robot body. The robot body comprises a drive system, a detecting assembly, a holder, a synchronous belt system, a movable platform and a control system, wherein the control system is arranged on the movable platform, the holder is fixed to the upper end of the movable platform, the detecting assembly is fixed to the holder, the synchronous belt system is fixedly connected with the combined track, the driving system is fixed to the movable platform, the movable platform is placed on the combined track, and the drive system provides power to enable a robot to move along the combined track. The wall-mounted combined track is adopted, the robot can move in two or more vertical planes, the combined mode meets the diverse and complex detecting requirements of indoor equipment detection, and according to the actual detecting requirement, a horizontal track or a vertical track can be independently taken out to independently form a system detection robot system.

The invention provides conductive silicone rubber with electromagnetic shielding performance and a manufacturing method, and belongs to the field of preparation of organic polymer/metal composite material and chemical processing. The conductive silicone rubber employs silicone rubber elastomer as a base and employs silvered nickel powder and silvered copper powder for enhancing the magnetic conductibility and the electric conductivity of the material and for further enhancing the comprehensive mechanical properties and the electromagnetic shielding performance of the composite material, and the conductive silicone rubber material has relatively good electromagnetic shielding performance at a frequency range of 200 KHz-10 GHz, is applicable to electromagnetic shielding of transformer stations, and can satisfy the material installation construction technology because of the good strength and toughness.

The invention discloses a novel electromagnetic shielding nanocarbon conductive fibrous material and a preparation method thereof, and belongs to the field of a nano-material technology. The material comprises the following components: graphite, a nanometer carbon fiber, a conductive polymer, a polymer adhesive, a dispersant, alkali metal fluoride, a metal catalyst, a conductive metal and a surface conditioning agent. The preparation method comprises the following steps: the graphite is subjected to pretreatment with alkali metal fluoride; the nanometer carbon fiber is oxidized by an acid mixture, the surface conditioning agent and the conductive metal are added separately, and a heating treatment is carried out; after the pretreated graphite and the pretreated nanometer carbon fiber are dissolved, the dispersant, the conductive polymer and the polymer adhesive are added for blending, and ultrasonic dispersion, ozonization treatment and grinding are carried out to form a homogeneous solution; a chemical blend is blended with the obtained solution, and the nanocarbon conductive fibrous material is prepared by a electrostatic spinning method. The novel electromagnetic shielding nanocarbon conductive fibrous material prepared by the invention has good electromagnetic shielding performance, and does not have toxicity and any carcinogenic substances; the novel electromagnetic shielding nanocarbon conductive fibrous material can be used for manufacturing radiation-proof clothes and the like.

The invention relates to a method for making conductive fabric through polyaniline-triggered chemical slivering. Fabric is soaked in a mixed solution of aniline and protonic acid, ammonium persulfate is added to the mixed solution, a reaction is carried out for 2-10 hours, and then the processed fabric is obtained after washing; the processed fabric is soaked in a silver nitrate solution, washed, dried, and then soaked in a silvering solution for being silvered for 30-60 min at the temperature of 30-40 DEG C, then the processed fabric is washed and dried, and finally the conductive fabric is obtained. According to the method, the process conditions of sensitization and activation are omitted, polyaniline and silver nitrate replace stannous chloride and palladium chloride high in price, cost is lowered, and environment pollution is reduced. The conductive fabric obtained through the method is good in conductivity, the binding strength of metal and fabric is high, the electromagnetic shielding performance is excellent, and the conductive fabric has an antistatic function, an antibacterial function and the like.

The invention relates to locomotive general-purpose circuit board functional test system and method. According to the multiple electric pluggable unit kinds feature of the locomotive, the invention adopts an PXI +GPIB mixing bus mode, which uses the GPIB bus to control all the tested desk type apparatuses and uses the PXI bus to control a matrix switch card, a digital in-out card and a general-purpose switch card, the matrix switch card, the digital in-out card and the general-purpose switch card are connected with external interfaces, while the external interfaces are connected with different test adapters. The invention adopts a method which combines using the measurement desk type apparatus to execute authoritative metering and using the corresponding matrix switch and general-purpose switch to execute self checking, provides a locomotive electric plug-in component automatization test system and method with high testing accuracy and high expandability.

The invention discloses a graphene film for light efficient electromagnetic shielding and a preparation method thereof. An oversized graphene oxide sheet is used for forming the film and by virtue of an annealing mode under high temperature, the graphene defect is perfectly repaired, the edge defect is reduced to the lowest to form a perfect large conjugate structure, and the smoothness of a head conducting path of the graphene is guaranteed; furthermore, through three steps of independent warming processes, a functional group is separated from the surface of the graphene step by step, a pore-foaming agent included between the graphene sheets is slowly decomposed, and the functional group and the pore-forming agent are released step by step in a gas mode; and meanwhile, the graphitization process is gradually developed to form a graphene micro airbag; in the forming process of the micro gasbag, the most stable functional group on the surface of the graphene falls off, thereby producing the graphene structure formed by 1-4 layers of graphene sheets with the gas expansion under high temperature; the successful introduction of the graphene few-layer structure greatly promotes the conductivity performance of the material. The micro gasbag structure is assisted by good conductivity performance so that the graphene of the invention has strong electromagnetic shielding performance.

The invention discloses an indoor intelligent patrol robot system based on an H-shaped combined rail. The system comprises a combined rail and a robot body; the robot body comprises a driving system, a detecting module, a holder, a synchronous belt system, a mobile platform and a control system, wherein the holder is fixed at the upper end of the mobile platform; the detecting module is fixed on the holder; the synchronous belt system is fixedly connected with the combined rail; the driving system is fixed on the mobile platform; the mobile platform is placed on the combined rail; and the driving system provides power to enable a robot to move along the combined rail. The combined rail is a wall-mounted combined rail, so that the position transfer in two or more vertical planes can be realized; the combined mode satisfies various and complex detecting requirements in the detection of indoor equipment; and a horizontal rail or a vertical rail can be singly taken out to independently build a system for detecting the robot system according to actual detecting demands.

The invention discloses a polymer-based electromagnetic shielding material based on carbon fiber and graphene and a preparation method of the polymer-based electromagnetic shielding material. The polymer-based electromagnetic shielding material is prepared by use of the following steps: firstly, acidizing the carbon fiber and performing ultrasonic dispersion on the acidized carbon fiber and the graphene in a solution containing a coupling agent to prepare an interpenetrating network structure; secondly, adding the solution of a polymer by use of a solvent mixing method and stirring and drying to obtain mixture powder; and finally, evenly mixing the mixture powder with an antioxidant, a compatilizer or other auxiliaries and then extruding and granulating by use of a twin-screw extruder. According to the polymer-based electromagnetic shielding material based on the carbon fiber and the graphene, an intertwined network structure of the carbon fiber and the graphene are kept inside the polymer so that an efficient power transmission and network can be formed in the matrix; the prepared electromagnetic shielding material has a good electromagnetic shielding effect, and also has the characteristic of good comprehensive mechanical properties and thermal conductivity. The polymer-based electromagnetic shielding material has the advantage of expanding the application of the carbon fiber and the graphene in the field of the electromagnetic shielding materials.

The invention discloses an MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and a preparation method thereof, and belongs to the technical field of electromagnetic shielding materials. The invention relates to an MXene-based flexible polyvinyl alcohol electromagnetic shielding composite film and a preparation method thereof. The preparation method comprises the following steps of: etching an MAX phase with hydrofluoric acid to obtain layered MXene, then intercalating the MXene and graphene to obtain an MXene/Graphene compound, loading magnetic nanoparticles Fe3O4 on the MXene/Graphene to obtain a Fe3O4@MXene/Graphene ternary composite material, and finally dissolving the Fe3O4@MXene/Graphene ternary composite material and polyvinyl alcohol in deionized water and drying to obtain the polyvinyl alcohol composite film. The obtained polyvinyl alcohol film has very good flexibility and has good compatibility with a composite filler, and the electromagnetic shielding effectiveness in the X wave band can reach 38-52 dB. Layered MXene and graphene with good conductivity are beneficial to multi-reflection attenuation of electromagnetic waves, the impedance matching characteristic is optimized through combination with the magnetic particles Fe3O4, and attenuation of the electromagnetic waves is facilitated.

The invention discloses a preparation method for a polymer material with a continuously-alternating layer structure. The preparation method comprises the following steps of step 1, premixing 30-70 parts of first resin or a first resin compound and 70-30 parts of second resin or a second resin compound, adding the premix in a double-screw extruder, performing melt blending and extrusion at a temperature of 100-300 DEG C, cooling, and slicing to obtain blend grains; and step 2, performing high-speed thin-wall injection forming on the obtained blend grains at an injection temperature of 100-300 DEG C and an injection speed of 50-1200 mm/s, so as to obtain the polymer material with a continuously-alternating layer structure. The preparation method disclosed by the invention is simple in the whole operation process, low in production cost, suitable for large-scale industrialized production, capable of regulating and controlling the thickness of the continuously-alternating layer structure by adjusting the component proportioning ratio of the blend, and suitable for various blend systems.

The invention discloses an electromagnetic shielding optical window making method, which belongs to the technical field of optical windows. The method comprises steps: crack nail polish containing waterborne acrylic resin is dispensed on the upper surface of a flat substrate, a spin coating method is adopted for coating the crack nail polish on the surface of the substrate uniformly, and a mask layer thin film is formed; in a specific temperature and humidity range, the mask layer thin film is dried naturally, and a crack template is formed; a conductive metal layer is deposited on the surface of the crack template; and finally, the crack template is dissolved and removed, and the electromagnetic shielding optical window is obtained. The problems of reducing light transmission performance of the optical window as the metal line width is increased, and reducing light transmission performance and electromagnetic shielding performance of the optical window due to a traditional mechanical friction way can be solved, a specific processing condition for solving the problem of uneven high-order diffraction energy distribution can be given, and thus the electromagnetic shielding optical window made by the method has good electromagnetic shielding performance and good optical performance.

The invention discloses an indoor rail-type intelligent patrolling robot. The indoor rail-type intelligent patrolling robot comprises a robot terminal system. The robot terminal system comprises a sectional material rail. The sectional material rail is installed on the indoor wall, and a movement mechanism, a movement driving mechanism and a detecting mechanism are installed on the sectional material rail. The detecting mechanism comprises a holder and a detecting assembly and is installed on the movement mechanism. The movement mechanism is driven by the movement driving mechanism and drives the detecting mechanism to vertically move along the sectional material rail, wide-range detection on an indoor to-be-detected device is achieved in cooperation with running of the holder, and the robot terminal system carries out power supply and communication in a cable pulling mode or carries out power supply in a wire sliding contact mode and carries out communication in a power line carrier mode. The indoor rail-type intelligent patrolling robot is compact and attractive in structure, rapid and convenient to install, stable and reliable in running, high in positioning accuracy, wide in detection range and high in automation degree.

The invention relates to a plasma air sterilizing and purifying device for an air-conditioned train, which comprises a plasma reactor, a pulse power source, a fan component, an air inlet, an air outlet and a shell and is characterized in that a positive electrode which is formed by arranging a plurality of nickel-chromium metal wires or nickel-chromium metal bands in the same plane at equal intervals in parallel is arranged in the plasma reactor; the positive electrode is arranged in the middle position of two adjacent negative electrodes; the two ends of the positive electrode are fixed in a groove or a convex part corresponding to a conductor rail for preventing micro-discharge; each negative electrode is made of an aluminum plate the surface of which is oxidized, and nano-TiO2 is respectively laid on the two surfaces of each negative electrode; and a pulse transformer and a pulse generator are arranged in the pulse power source and are arranged according to a single-ended flyback inverter. The device of the invention is arranged at the return air inlet or the air outlet of an air conditioner in a carriage, and the existing facilities of the air-conditioned train do not need to be changed. The device of the invention is the optimal combination of plasma and TiO2, has high dynamic sterilization and purification efficiency of a passenger train, and has the advantages of energy saving, good reliability, long working life, simple structure and convenient installation.

The invention which relates to a preparation method of a composite conductive fabric with spray polymerization belongs to the technical field of textiles. An atomization mode is adopted in the invention to atomize a monomer solution into particles, and an in situ polymerization reaction is initiated on a monomer under the effect of an oxidant deposited in the fabric to prepare the composite conductive fabric. The preparation method of the invention which has the advantages of easy controlled condition, simple operation, low raw material cost, and less energy consumption is suitable for the large scale and industrial production. Compared with routine products prepared with a liquid-phase oxidation method, the adhesion between a conducting layer and a fabric matrix of the composite conductive fabric prepared in the invention is substantially improved, the conducting layer is more compacted, and protrude wear resistances and solvent resistances are possessed; the surface resistor of the preparative composite conductive fabric is 10-10<5>omega/cm<2>, the conductivity is good, the electromagnetic shielding property and the flexibility of a product (the composite conductive fabric) are good, and the surface resistor of the product in the invention is sensitive to the change of pressure, elasticity and the like, so the product can be widely applied to the sensor field, the antistaticfield, the anti-electromagnetic shielding field and the like.

The invention provides a submodule unit of a voltage source transverter based on full control components. The voltage source transverter is a three-phase six-bridge structure. Each bridge arm comprises a plurality of submodules which are connected in series. Each submodule comprises electric power components such as a capacitor, insulated gate bipolar translators (IGBT) modules with a structure of a semi-bridge, wherein the capacitor and the IGBT modules are connected in parallel. The submodule unit of the voltage source transverter based on the full control components further comprises a main support structure, a support plate, a connecting water pipe, radiators and the like. The main support structure is used for supporting the electric power components of the submodule unit, the support plate, the connecting water pipe and the radiators. The support plate is perpendicular to a base of the main support structure. The support plate is provided with the two radiators which are symmetrically arranged. The radiators are connected through the connecting water pipe. Two IGBT modules of each submodule are respectively arranged on the two radiators. The bottom of the capacitor of the each submodule is fixed on the base of the main support structure through bolts. The submodule unit of the voltage source transverter based on the full control components is a self-contained electrical system, is capable of expanding according to the need of the system, and is independent in structure and convenient to install and transport.

The invention relates to silver-plated copper powder and a preparation method thereof; the powder comprises the following raw materials by the percentage of the raw materials in the total weight: 5 percent to 30 percent of silver, and the balance of copper. According to the invention, a method for replacing and reducing composite plating silver by copper powder is adopted, the prepared silver-plated copper powder has good coating performance, strong oxidation resistance and low volume resistivity, and can be widely applied to various electromagnetic shielding fillers, conductive adhesives and conducting coatings.

The invention is a roll processing method of deformed Mg and Ma alloy sheets, adopting hot-rolling and multiple warm-rolling methods for extruded or forged ingot blanks, and semicontinuous/continuous cast ingot blanks, strictly controlling preheating temperature of forming roll and press roll and sheet temperature; firstly ingot blank milling and sawing-heating-hot rolling-blanking-cutting finished product into thick sheets-packing and storing; then the thick sheet blanks-heating-warm rolling-acid pickling-heating-secondary warm rolling-interrupting or blanking-heating-tertiary warm rolling-annealing finished products-cutting finished products into medium sheet-packaging and storing; then sheet blanks--middle annealing-primary thin sheet warm rolling-middle annealing-secondary thin sheet warm rolling-heating-tertiary thin sheet warm rolling-annealing finished products-cutting finished products into thin sheets and ultrathin sheets-packaging and storing; and finally making into100-0.2mm thick deformed Mg and Ma alloy sheets.

The invention provides an electromagnetic shielding material and a preparation method and application thereof. The electromagnetic shielding material comprises a polymer matrix and graphene-charcoal composite filler dispersed in the polymer matrix, wherein the graphene-charcoal composite filler is composed of charcoal and graphene applied to the surface of the charcoal. The layer number of the graphene in the electromagnetic shielding material is single, the conductivity can as high as 50 S/m, and the effectiveness of shielding electromagnetic waves of 8-12 GHz can be as high as about 50 dB. The graphene content in the obtained electromagnetic shielding material is lower and is one or more magnitude order lower than that of an electromagnetic shielding material using pure graphene as filler, the production cost is greatly reduced, and the graphene-charcoal composite filler preparation method is simple, high in universality and suitable for large-scale popularization and use.

The invention relates to a connector which comprises a male connector and a female connector which are mutually connected in an insertion mode. The male connector comprises a male terminal which is composed of an inserted connection part and a welding line part riveted at the back end of the inserted connection part. The inserted connection part is formed by twisting a plurality of metal wires. The female connector comprises a female terminal made of a copper tube. The inserted connection part is formed by twisting the plurality of metal wires and then is integrated with the welding line part in a riveted mode, and the female terminal is made of the copper tube, and therefore large currents can be transmitted at butt joint time of the male connector and the female connector. Tests prove that each terminal can bear 5A currents, and terminals for detection also can bear 3A currents. The connector can meet requirements of quick charging a battery of high power capacity.

The invention relates to a probe type on-line monitoring system and a probe type on-line monitoring method for water petroleum pollutants. The system comprises an excitation light source, a detector and a control circuit board, wherein the excitation light source is used for emitting ultraviolet light which is emitted to the surface of water to be monitored at a certain angle; a light input end of the detector is provided with a light filter which is used for receiving fluorescent light reflected from the surface of the water to be monitored; and the control circuit board is connected with the detector and a control end of the excitation light source, is used for acquiring fluorescent light signals and temperature and calculating the concentration of the petroleum pollutants in the water, and is connected to an upper computer through a transmitting cable. The method comprises the following steps of: acquiring the fluorescence intensity of the surface of the water to be monitored through the excitation light source and the detector; and determining the concentration of the petroleum pollutants in the water to be detected according to the linear relation between the fluorescence intensity and the concentration of the petroleum pollutants in the water. A low-power-consumption ultraviolet light emitting diode (LED) is used as the excitation light source, the concentration is measured by the fluorescent characteristic of the petroleum pollutants, sensitivity and measurement speed are high, the steps are simple, and the system and the method can be used for monitoring petroleum pollutants in various water areas in an on-line manner.

The invention relates to a preparation method of a Co3O4/PANI/MXene/PI electromagnetic shielding fabric. The preparation method comprises the steps: pretreating a PI fabric, and then carrying out plasma treatment; spraying MXene solution to the surface of the treated PI fabric for reaction; spraying Co3O4/PANI nanowire solution on the obtained MXene/PI composite for reaction; treating the obtainedCo3O4/PANI/MXene/PI composite in a PDMS (polydimethylsiloxane) solution. The preparation method is simple and has mild conditions, and the obtained electromagnetic shielding fabric has excellent conductivity and electromagnetic shielding performance.

The invention discloses a stealth destroy-resistant shielding material and a preparation method thereof. The stealth destroy-resistant shielding material is an integral layered structure formed by sequentially stacking and connecting a skin layer, a wave-absorbing foam layer, a destroy-resistant layer, an electromagnetic shielding enhancement layer and a reflection layer, and the thickness of thestealth destroy-resistant shielding material is 25-40 mm. Three materials with stealth performance, destroy resistance and electromagnetic shielding performance are perfectly combined to prepare a composite material system with first-level stealth performance, bulletproof and destroy-resistant effects and high-performance electromagnetic shielding performamce. The destroy resistance is realized through a high-density polyethylene polymer material; and low surface density is realized through the structural design between of wave-absorbing foam and a wave-absorbing material, so while the low surface density is realized, the stealth performance is not influenced.

The invention relates to a fabric material and a production method thereof. The fabric material comprises a substrate layer and modification layers formed on at least one side of the substrate layer,wherein the substrate layer comprises a fabric layer, each modification layer comprises a one-dimensional nano conductive material and a two-dimensional nano conductive material, the surface of each modification layer is a layer formed by the two-dimensional nano conductive material, and the two-dimensional nano conductive material is selected from two-dimensional transition metal carbon/nitrogencompound. The two-dimensional nano conductive material and the one-dimensional nano conductive material are assembled on the substrate layer, nanowire contact resistance is lowered, excellent electromagnetic shielding performance is achieved, the aging spontaneous hydrophobicity and humidity responsiveness of the two-dimensional conductive material on porous fabric allow the electronic fabric to have hydrophobicity and a humidity monitoring function. The multifunctional fabric is widely applicable to fields such as intelligent garments, humidity sensors and electromagnetic shielding.

The invention discloses a method for manufacturing an electromagnetic shielding curved surface optical window with a metal mesh structure, and belongs to the technical field of optical windows. The method comprises the steps: pasting an adhesive tape at an edge of the external surface of a curved surface substrate firstly, and coating the edge with crack lacquer; naturally drying the crack lacquer under the proper conditions secondly, thereby forming a crack template; peeling off the adhesive tape thirdly and then depositing a conductive metal layer on the surface of the crack template; and finally dissolving and eliminating the crack template, thereby obtaining the electromagnetic shielding curved surface optical window. The method not only prevents the increase of the width of a metal line from causing the reduction of light transmittance performance of the optical window, but also prevents a conventional mechanical friction mode from causing the reduction of the light transmittance performance of the optical window and the electromagnetic shielding performance at the same time. The method also can give specific machining conditions for solving a problem that the energy of high-order diffraction is not distributed uniformly, thereby enabling the optical window manufactured through the method to be good in electromagnetic shielding performance and optical performance and to be wider in application range.

The invention relates to a PET (polyethylene terephthalate)-based electromagnetic shielding composite and a preparation method thereof. The composite comprises a PET matrix material and nanometer inorganic filler uniformly dispersed in the PET matrix material. The composite is characterized in that the composite nanometer inorganic filler consists of graphene which is 0.35-20nm in thickness and 1-20mu m in diameter and silver nanowires which are 40-500nm in diameter and 5-50mu m in length. The PET-based electromagnetic shielding composite has favorable electromagnetic shielding performance, has excellent electromagnetic shielding performance and stable performance compared with the common anti-radiation fabric and can substitute for the traditional anti-radiation fabric. The PET-based electromagnetic shielding composite is suitable for manufacturing of anti-radiation clothes.

The invention discloses an MXene/silver nanowire/nanocellulose composite film and a preparation method thereof. The method mainly comprises the following steps: (1) etching MAX to prepare a single-layer MXene colloidal solution; (2) preparing a silver nanowire colloidal solution; (3) preparing a carboxylated nanocellulose colloidal solution by a TEMPO oxidation method; (4) mixing the three colloidal solutions according to a certain mass ratio, conducting stirring and carrying out ice-bath ultrasonic treatment to obtain a uniform mixed solution; and (5) carrying out vacuum suction filtration on the mixed solution, and carrying out hot-pressing drying to obtain the MXene/silver nanowire/nanocellulose composite film. According to the preparation method of the MXene/silver nanowire/nanocellulose composite film, the prepared composite film has good flexibility, electrochemical performance, electromagnetic shielding performance and antibacterial performance, and has wide application prospects in the fields of aerospace, weaponry, flexible wearable equipment and the like.