226 results about "Graphene coating" patented technology

The invention relates to the technical field of composite metal materials, in particular to a silver-coated graphene copper composite material and a preparation method thereof, and aims at solving the problems that traditional silver-coated copper powder is high in silver consumption, copper is oxidized due to the fact that a silver layer is prone to being damaged, and conductivity is insufficient. The method comprises the steps that a graphene coating layer is formed on a copper powder substrate in situ through chemical vapor deposition, and graphene copper powder is obtained; performing etching treatment on the graphene copper powder to controllably expose part of the copper substrate so as to form anchoring points for silver ion deposition; carrying out reduction treatment on the etched graphene copper powder so as to ensure that an anchoring site has chemical activity; in a reductive liquid phase environment, enabling a chemical silver plating solution to react with the graphene copper powder subjected to reduction treatment, and guiding silver ion deposition by utilizing an anchoring point, so as to form a silver coating layer on the surface of the graphene coating layer; and separating and drying the reacted system to obtain the silver-coated graphene copper composite material. The material is better in oxidation resistance and conductivity, and the process is free of waste liquid.

A self-cooling overhead bare conductor relates to the technical field of power transmission equipment and structurally comprises a conductor substrate, a graphene coating used for radiating heat is arranged on a backlight surface of the conductor substrate, and the coverage range of the graphene coating in the circumferential direction of the conductor substrate is 120-180 degrees. The graphene coating is arranged in a segmented mode in the length direction of the wire base body, the length of each segment of the graphene coating is 5 / 3-2 times of the diameter of the wire base body, and the distance between every two adjacent segments of the graphene coating is 0.85-1 time of the diameter of the wire base body. Sand blasting treatment is carried out on the joint face of the wire base body and the graphene coating, the surface roughness is Ra3.2-6.3 microns, oxidation films and impurities on the surface of the wire base body are removed, the adhesive force of the graphene coating is enhanced, and the thickness of the graphene coating is 40-80 microns. According to the invention, the technical problem of current limiting caused by temperature rise of the wire can be solved.

The utility model discloses a diving fabric implanted with patterns. The diving fabric comprises a foamed chloroprene rubber sponge sheet, a graphene coating, a patch, a floral pattern layer and a titanium coating. The foamed chloroprene rubber sponge sheet subjected to compression treatment is used as a base material, the compressed sponge sheet is higher in apparent density, the internal hash molecular structure of the sponge sheet is tighter, the surface of the sponge sheet is smoother, printing materials such as printing ink can better permeate into the surface layer of the sponge sheet, and patterns and the sponge sheet are fused together; a layer of textile fabric does not need to be added between the floral patterns and the sponge sheet, the floral patterns can be better presented while environmental protection is achieved, and the service life of the floral patterns is prolonged. In addition, the titanium coating enables the floral patterns to be better in oxidation resistance and friction resistance, the floral patterns printed on the sponge sheet can be better protected, the corrosion resistance and abrasion resistance of the floral patterns in a seawater environment are improved, the service life of the floral patterns is prolonged, and the attractiveness of the floral patterns is improved.

The application discloses a graphene-diamond composite coating and a preparation method and application thereof, and belongs to the technical field of materials. The graphene-diamond composite coating comprises a diamond coating and a graphene coating; graphene sp2 bond structure is covalently combined with diamond sp3 bond structure; and the graphene coating has a graphene structure with non-parallel growth mainly in a vertical direction. The graphene-diamond composite coating has small lattice mismatch between the diamond and the graphene, avoids volume expansion caused in a friction heat process, and has the advantages that the diamond coating can provide a support layer for the graphene, forms super-strong C-C covalent bonds at an interface, and significantly improves the adhesion strength of the graphene; the graphene can avoid brittle fracture of the diamond, and significantly improves the lubricating performance of the surface of the diamond coating. The composite coating has better wear resistance, a low friction coefficient and excellent oxidation resistance, and can remain stable under high-temperature and high-load working conditions, so that the service life and processing efficiency of wear-resistant parts are improved.

The invention discloses a preparation method of a graphene composite coating with multifunctional characteristics, which comprises the following steps: processing a substrate, coating a carbon source polymer solution on the surface of a substrate material to form a polymer liquid film, and treating a polymer to form a polymer film; laser induction: carbonizing the polymer film by using laser to form a laser-induced graphene (LIG) coating; functional particles are added, nanoparticles are doped on the surface of the LIG coating in a coating mode, and a composite structure is formed; integrating the multifunctional coating, and forming the graphene-based multifunctional composite coating through post-treatment.

The invention discloses an H-shaped armature of an electromagnetic rail gun, and belongs to the technical field of electromagnetic emission. The wind power generation device comprises a windward front surface, a windward curved surface, a windward inner surface, a top surface, a bottom surface, side surfaces, a leeward front surface, a leeward curved surface and a leeward inner surface, the graphene film is characterized in that both the top surface and the bottom surface are coated with graphene. According to the invention, the stability in electromagnetic emission is better, the emission efficiency can be effectively improved, and the graphene coating is coated on the surface of the armature in combination with the shape, so that the armature can reach a higher average speed and has a better arc ablation resistance effect, and the armature also has a certain lubrication effect; the conductive filler can be used as a good interface conductive filler to improve the contact state of a pivot rail interface. Therefore, the problems of'planing ', 'ablation', 'adhesion ', 'transition' and the like in the electromagnetic gun launching process are further improved.

The invention discloses an anticorrosive graphene coating and a preparation method thereof, and belongs to the technical field of coating preparation, and the coating comprises the following components in parts by weight: 80-95 parts of water-borne epoxy resin, 8.5-9.5 parts of graphene anticorrosive filler, 0.5-1 part of a flatting agent, 0.5-1 part of a defoaming agent, 7-9 parts of a curing agent and 0.2-0.3 part of a dispersing agent. The addition of the phytic acid solution and the pretreatment of the Na-montmorillonite can synergistically enhance the impact resistance and corrosion resistance of the coating prepared by the invention.

The invention relates to the technical field of bionic electronic skin and flexible sensing materials, in particular to an AF / rGO fiber tactile system and method.The AF / rGO fiber tactile system and method.The AF / rGO fiber tactile system and method are specifically characterized in that aramid 1414 fibers are adopted as a base material, subjected to ultrasonic cleaning and then repeatedly soaked in a graphene oxide solution, a graphene oxide coating is loaded on the surface of the aramid 1414 fibers, and the AF / rGO fiber tactile system is obtained; reducing into a graphene oxide coating by utilizing steam reduction, and performing hot pressing synergism to prepare an AF / rGO fiber sensor; the piezoresistive and thermosensitive effects of the fiber are utilized, the fiber serves as a core material of the sensor and is connected with two electrodes to be assembled into the sensor, mechanical and temperature stimulation is converted into resistance signal change, and the pressure and temperature sensing capacity of the skin is simulated through multi-mode fusion and signal processing. Based on the contact resistance dynamic response of the micro-scale structure, combining a neural network algorithm to realize fabric recognition and gesture recognition; and meanwhile, fire early warning is triggered through temperature resistance signal change by utilizing the flame-retardant characteristic of the aramid fiber substrate.

The utility model discloses a building water supply and drainage pipeline anti-blocking device which comprises a water supply and drainage pipe, internal threads are arranged on the inner wall of the water supply and drainage pipe, the inner wall of the water supply and drainage pipe is in threaded connection with a filter cartridge, and the inner wall of the filter cartridge is connected with a coarse filter screen. Through the arrangement of a coarse filter screen, a fine filter screen, a graphene coating, an internal thread and a filter cartridge, coarse and fine impurities entering the water supply and drainage pipe can be filtered through the coarse filter screen and the fine filter screen, a large number of impurities effectively enter the water supply and drainage pipe, and the water supply and drainage pipe is prevented from being blocked; through arrangement of an annular water pipe, a backwashing spray head, a high-pressure water supply pipe, a control water valve and a pressure regulating valve, the control water valve can be opened to realize water supply of the annular water pipe, and water is sprayed out through the backwashing spray head, so that backwashing of the filter cartridge can be realized, impurities adhered to the filter cartridge are effectively removed, and water impurities are effectively filtered; the blockage phenomenon in the water supply and drainage pipe is effectively avoided.

The utility model relates to lead -acid battery technical field, concretely is a kind of lead -acid battery current collector structure, including frame, recess is opened in the frame, the recess is equipped with porous carbon framework, the porous carbon framework is equipped on battery current collector main body, the battery current collector main body is attached with a layer of carbon cloth, the battery current collector main body is by surface body, aperture plate and grid three parts are composed, the grid is attached with one side graphene coating layer. The recess in the lead -acid battery current collector frame of the device is equipped with one side porous carbon framework, can increase the utilization of active material, improve the charge transfer efficiency of battery, the surface body of battery current collector main body is equipped with graphene coating layer, can significantly reduce the corrosion of surface body, improve the conductivity and current density of battery, the lead -acid battery current collector surface layer is equipped with a layer of carbon cloth, wherein carbon cloth and lead -acid battery current collector cooperate and have the charge-discharge performance and cycle life of the improvement of lead -acid battery.

The present application relates to graphene material and its preparation technology, specifically to a method for growing graphene on the surface of non-metallic particles on a large scale, which is suitable for large-scale preparation of graphene-coated non-metallic powder material. The present application uses a two-step method to grow graphene uniformly on the surface of a large number of non-metallic particles: first, mix a large number of non-metallic particles with a carbon source, and form a bulk composite material of non-metallic particles and carbon through low-temperature carbonization; then, pass current to the above bulk composite material using electrodes to heat it to a higher temperature, convert the carbon into graphene, until graphene-coated non-metallic particles are obtained, which are separated from each other, and the high-temperature heating process stops spontaneously. The present application can grow a graphene layer on the surface of a large number of non-metallic particles, the method is easy to scale up, and has the characteristics of good uniformity of graphene coating and high particle separation degree; at the same time, by taking advantage of the large resistance of graphene-coated non-metallic particles which are separated from each other, the high-temperature heating process stops spontaneously.

The application discloses a capacitor degradation state control method, device, medium and product, and the method is: obtaining the running state data, the first response signal and the first transient voltage recovery sequence of a graphene coating capacitor, and analyzing to obtain the electrical impedance spectrum characteristics and the transient recovery characteristics; matching the analysis results in the preset degradation characteristic library to obtain a degradation matching set; if the set meets the preset degradation condition, compensating the first response signal and the first transient voltage recovery sequence by using the obtained external environment data, and determining the degradation state data based on the second response signal and the second transient voltage recovery sequence obtained after compensation; and determining the target running control parameter of the graphene coating capacitor based on the degradation state data to control its safe operation in the degradation state. The application can accurately identify the degradation defects of the graphene coating capacitor and control its degradation state accordingly, so that the risk of capacitor out-of-control caused by the degradation defects can be overcome.

A battery pack and a cover for a battery pack are provided. A battery pack according to the present invention can include a battery pack case in which an accommodation space portion is divided in which a plurality of battery modules are accommodated, the battery pack case having an open side, and a cover installed to cover the side of the battery pack case and having a graphene coating formed thereon.

The utility model discloses an efficient and even heating oven, which relates to the technical field of ovens, and comprises an oven body, an electric heating plate used for contact type heating is mounted at the inner bottom of the oven body, an upper heating assembly used for radiation and heat convection heating is mounted at the inner top of the oven body, an oven tray is placed in the oven body, and a lower heating assembly used for radiation and heat convection heating is mounted at the inner top of the oven body. An opening of the baking tray faces upwards, the bottom of the baking tray makes contact with the electric heating tray, the upper heating assembly comprises an assembling frame, a plurality of strip-shaped open holes are formed in the lower surface of the assembling frame, an electric heating radiation pipe is installed in the assembling frame, a cover plate is installed above the assembling frame, and a second temperature sensor is installed on the outer wall of the cover plate. The problems that when an existing oven is used, although the temperature rising efficiency is improved through a graphene coating, heat needs to be blown to food through a fan after temperature rising, in the process, heating is conducted completely depending on gas convection generated by the fan, and the efficiency is low are solved.

The application relates to the technical field of liquid cooling plates, and particularly discloses a graphene-coated liquid cooling plate, which comprises an upper substrate, a lower substrate and a graphene coating, the upper substrate is provided with a groove, a flow channel for circulating cooling liquid is formed between the upper substrate and the lower substrate through the groove, the flow channel is connected with an inlet and an outlet respectively, the graphene coating is arranged on one side of the lower substrate away from the upper substrate, the graphene coating is provided with concave unit microstructures arranged in an array, the upper substrate and the lower substrate are connected through rolling, and the flow channel is prepared through blow molding. The graphene-coated liquid cooling plate utilizes the excellent heat conductivity of the graphene coating to conduct heat to the cooling liquid in the flow channel of the liquid cooling plate, the concave unit microstructures on the surface of the graphene coating can increase the heat exchange area to sufficiently dissipate and transfer heat, the heat exchange efficiency is improved, and the heat dissipation effect of the liquid cooling plate is improved. The rolling connection-blow molding is adopted to improve the sealing reliability and overall formability of the liquid cooling plate.

The utility model belongs to the technical field of automobile brake systems, and particularly relates to a light-weight automobile brake disc. The outer side of the disc body is provided with an arc-shaped groove and embedded radiating fins, and the groove is filled with a heat-conducting silica gel layer; a mounting hole is formed in the center of the disc body, honeycomb lightening holes are formed around the disc body, and a tungsten carbide coating is sprayed on the inner wall; a first reinforcing rib and a second reinforcing rib are arranged on the two sides of the disc body and are welded and fixed through a connecting plate. The disc body is made of an aluminum alloy base material, the surface of the disc body is subjected to anodic oxidation and graphene coating treatment, and the disc body has both light weight and corrosion resistance. By optimizing the structural design, the weight is remarkably reduced while the strength is guaranteed, the heat dissipation performance is improved, and the automobile brake pad is suitable for a high-performance vehicle brake system and meets the requirements of modern automobiles for light weight and efficient heat dissipation.

The utility model relates to the technical field of cables, and discloses a graphene efficient heat dissipation cable which comprises a cable body, a conductor is arranged in the cable body, an insulating layer is arranged on the outer side of the conductor, a shielding layer is arranged on the outer side of the insulating layer, a heat dissipation layer is arranged on the outer side of the shielding layer, and an outer sheath is arranged on the outer side of the heat dissipation layer. The surface of the conductor is coated with a first graphene coating; and graphene microchips are uniformly dispersed in the insulating layer material. The cable has the following advantages and effects: through arrangement of the insulating layer, the heat dissipation layer and the outer sheath, heat generated in the cable can be rapidly conducted to the outer sheath through excellent heat conductivity of graphene, and then the heat is efficiently dissipated to the surrounding environment through the heat dissipation fins on the surface of the outer sheath; the purposes of effectively reducing the operating temperature of the cable, reducing insulation aging and electrical fault risks caused by overheating, greatly prolonging the service life of the cable and greatly improving the operating stability of the cable can be achieved.

The utility model relates to a waterproof and breathable masking paper composite adhesive tape which comprises a reel and an adhesive tape body, the adhesive tape body is of a four-layer structural design and comprises an anti-sticking layer, a base material layer, a waterproof and breathable layer and an adhesive layer which are sequentially connected from the outer layer to the inner layer, the manufacturing process of the adhesive tape is simplified, and the production efficiency is improved; the anti-sticking layer comprises polytetrafluoroethylene and a titanium dioxide / graphene coating and is used for improving the anti-sticking effect and the ultraviolet-proof performance of the adhesive tape; the waterproof breathable layer comprises expanded polytetrafluoroethylene and nanofibers and is used for improving the waterproof and breathable performance of the adhesive tape and ensuring that the stable effect can be kept in various environments; the adhesive layer comprises polyurethane, a water-based acrylic pressure-sensitive adhesive and an organic silicon modifier, and nano silicon dioxide is uniformly distributed in the water-based acrylic pressure-sensitive adhesive; the adhesive force of the adhesive tape can be improved, cohesive strength is enhanced, weather resistance is improved, aging is delayed, degumming and wiredrawing phenomena are reduced, adhesive residues are reduced, and use experience is improved.

Disclosed are a high-performance natural graphite negative electrode material, a preparation method therefor, and a use thereof. In the negative electrode material of the present invention, a uniform and thin amorphous carbon layer coated on surfaces of each curled flake graphite layer inside the natural graphite in a core can prevent organic molecules in an electrolyte from penetrating into spherical graphite during charging and discharging to generate a new SEI film, thereby preventing delamination of the curled graphite layers inside the spherical graphite; sulfonated graphene in the inner shell has good flexibility, which can alleviate the volume expansion of natural graphite during charging and discharging, improving the cycling performance of natural graphite up to 1500 cycles. An outermost amorphous carbon layer can reduce the specific surface area of the inner sulfonated graphene, preventing reduction of first-cycle efficiency of a lithium-ion battery caused by the graphene coating. In the natural graphite negative electrode material of the present invention, the amorphous carbon layer is uniform and thin, and does not reduce the tapped density and gravimetric capacity of the anode material.

The utility model discloses a surface treatment heat preservation device for a small-size guardrail connecting piece, and belongs to the technical field of surface treatment. The device comprises: a housing; the heat preservation cabin is arranged in the shell, and guardrail connecting pieces can be placed in the heat preservation cabin; the heating tube is arranged in the heat preservation cabin and comprises a heating part and a pin connected with the heating part, the heating part is located in the heat preservation cabin, and the pin extends downwards to be connected with an external power supply; the base is matched with the shell; the heating part is provided with a graphene coating film obtained by plating the surface of the heating part, and the heating part can heat a guardrail connecting piece in the heat preservation cabin.

The embodiment of the utility model provides a lead frame anti-oxidation operation system, and relates to the field of semiconductors. The anti-oxidation operation system for the lead frame comprises a transmission part, a heating source, a plasma power supply, a first air inlet pipe, a heating cover and a deposition cavity, the transmission part is used for transmitting the lead frame, the heating source is connected to the heating cover, the plasma power source and the first air inlet pipe are connected to the deposition cavity, the first air inlet pipe inputs carbon source gas into the deposition cavity, the heating cover is located on the lower side of the deposition cavity, and the heating cover and the deposition cavity are used for getting close to the transmission part under the action of external force. And covering the lead frame for plasma deposition. In the working process, the heating source provides heat energy for the heating cover, and the plasma power supply is used for providing energy to enable the carbon source gas input by the first gas inlet pipe to form plasma in the deposition cavity, so that a graphene coating is conveniently deposited and formed on the lead frame, and the oxidation resistance of the lead frame is further improved; and the negative influence on the use performance is avoided.

A preparation method of a carbon-based composite coating, comprising the following steps: step S10, sequentially forming a diamond coating and a catalytic layer on the surface of a workpiece substrate; step S11, forming a graphene coating on the surface of the catalytic layer; and step S12, removing the residual catalytic layer to form a carbon-based composite coating containing the diamond coating and the graphene coating on the surface of the workpiece substrate. In the present application, the catalytic layer is uniformly deposited on the surface of the diamond coating by using the magnetron sputtering technology, which provides an ideal interface for growing a more uniform and complete graphene coating; and the mixed acid solution can selectively etch the catalytic layer without damaging the diamond and graphene coatings by changing the proportion of each component and finely adjusting the corrosion degree and speed of the mixed acid solution, thereby further ensuring the direct contact between the diamond coating and the graphene coating, increasing the active sites on the diamond surface, helping to form more covalent bond connections with the graphene, and thus enhancing the bonding strength of the carbon-based composite coating interface and improving its stability under high-temperature friction conditions.

The application provides a preparation method of graphene oxide modified thermoplastic resin master batch, comprising the following steps: preparing a graphene oxide solution; coating the graphene oxide solution on a thermoplastic resin sheet to form a graphene oxide coating layer, and drying to obtain a graphene oxide / thermoplastic resin sheet; stacking a plurality of graphene oxide / thermoplastic resin sheets, and sequentially performing hot pressing, crushing and blending extrusion to obtain the graphene oxide modified thermoplastic resin master batch. The preparation method provided by the application can make the graphene oxide fully dispersed in the thermoplastic resin by coating the graphene oxide solution on the surface of the thermoplastic resin sheet and combining with the hot pressing, crushing and blending extrusion treatment, effectively improves the compatibility of the graphene oxide and the thermoplastic resin, and has the characteristics of simple operation process, low manufacturing cost, short processing period, less pollution and the like, and has good practical application value.

The invention relates to the technical field of lithium batteries, in particular to a bipolar current collector, a preparation method thereof and a lithium metal battery. The bipolar current collector comprises a metal foil, an alpha zirconium phosphate doped polyaniline coating and a graphene coating; the metal foil comprises an anode metal foil layer and a cathode metal foil layer; the positive electrode metal foil layer is stainless steel foil, and the surface of the positive electrode metal foil layer is coated with the graphene coating; the negative electrode metal foil layer is a copper layer, and the surface of the negative electrode metal foil layer is coated with the alpha zirconium phosphate doped polyaniline coating; the preparation method of the bipolar current collector comprises the following steps: performing magnetron sputtering on the surface of stainless steel foil to form a copper layer; metal foil is obtained; coating the surface of the copper layer with an alpha zirconium phosphate doped polyaniline solution, drying and curing to form an alpha zirconium phosphate doped polyaniline coating; then, the surface of the stainless steel foil is coated with graphene slurry, post-treatment is conducted, and a graphene coating is formed; and obtaining the bipolar current collector. And preparing the lithium metal battery by using the bipolar current collector.

This invention relates to the field of functional coatings technology, specifically disclosing a porous graphene coating, its preparation method, and its applications. The porous graphene coating is formed by applying a functional coating to the surface of a substrate and then curing it under laser irradiation. The functional coating includes a base coating and functional materials added to the base coating, including graphene, laser absorbers, and fillers. Addressing the core problem of existing graphene-containing coatings where graphene easily aggregates and is easily encapsulated by the coating matrix, resulting in low VOCs adsorption efficiency and difficulty in forming a stable porous structure, thus limiting adsorption capacity, this invention provides a porous graphene coating. By introducing laser absorbers into the coating formulation, the laser absorption capacity of the coating is enhanced. Combined with laser irradiation to achieve surface vaporization of the coating, the graphene is exposed and forms a porous structure, thereby significantly improving the coating's VOCs adsorption performance.

The invention provides a montmorillonite single crystal copper wire material and a preparation method thereof. A vertical roll-to-roll technology is utilized, a copper wire is fastened to an unwinding rotating shaft of a lower unwinding cavity, the starting end of the copper wire penetrates through a tubular furnace body from bottom to top and is fixed to a winding rotating shaft of an upper winding cavity, tension within a specific range is applied to the winding end, the copper wire runs at the winding speed of 10-100 mm / min, a specific temperature gradient is applied in the running direction of the copper wire, and the copper wire is wound. Continuous growth of copper single crystal grains is promoted; and meanwhile, carbon source gas is introduced into the cavity, graphene on the surface of the copper wire grows in a chemical vapor deposition mode, and after continuous growth is completed, the monene single-crystal copper wire material is obtained. In the process, single crystallization of the copper wire and coating of graphene on the surface of the copper wire are achieved at the same time, and the conductivity of the prepared monene single-crystal copper wire material is greatly improved compared with that of an original copper wire.

The invention provides a high-adhesiveness graphene coating as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The graphene coating is prepared from 100 parts of modified resin, 5 to 10 parts of graphene microcapsules, 20 to 30 parts of a solvent, 0.5 to 1 part of an auxiliary agent, 45 to 55 parts of a curing agent and 0.5 to 1 part of an adhesion promoter; wherein the graphene microcapsule is of a three-layer structure, an inner shell layer wraps the surface of graphene, an outer shell layer wraps the surface of the inner shell layer through polymerization reaction, a cavity exists between the inner shell layer and the outer shell layer, and the cavity is filled with an interface anchoring agent; the inner shell layer is an amphiphilic hyperbranched polymer, and the outer shell layer is a polyurea polymer; and the interface anchoring agent is gamma-aminopropyl triethoxy silane. According to the preparation method, graphene coating components and graphene are modified, so that stable combination of graphene and a resin matrix is realized, and the adhesion performance of graphene is greatly ensured.

The invention discloses a server case self-cleaning system and method based on composite cleaning and intelligent decision making, and the system comprises a composite cleaning execution unit, the inner wall of a case and the surface of a heat dissipation assembly are covered with a nano catalytic coating containing a metal organic framework and a compound enzyme, organic pollutants are decomposed, and antibacterial ions are released; micro piezoelectric ceramic pieces are embedded in the heat dissipation fins, the functions of ultrasonic vibration dust removal and thermoelectric power generation are achieved, and the temperature difference between the fins and air is used for supplying energy to the system. The miniature cleaning mechanical arm brush head is of a shape memory alloy and graphene coating combined structure and can be flexibly matched with gaps and self-repair abrasion, the cleaning efficiency and comprehensiveness are remarkably improved, and the service life of the miniature cleaning mechanical arm brush head is prolonged. Full-granularity coverage cleaning from nanoscale (less than or equal to 50nm) to macroscopic particles is realized through multi-dimensional cooperation (decomposition of organic pollutants by a nano catalytic coating, stripping of accumulated dust by piezoelectric vibration, directional removal of charged particles by liquid-electricity driving and the like) of the composite cleaning execution unit.

The invention relates to the field of composite materials, in particular to a copper graphene composite material and a preparation method thereof. The invention provides a preparation method of a copper-graphene composite material. The preparation method comprises the following steps that S1, a copper pipe is expanded, extruded and deformed into a taper pipe; s2, graphene slurry is applied to the inner surface and the outer surface of the taper pipe, drying is conducted, and the taper pipe with a graphene coating is obtained; s3, a plurality of taper pipes with the graphene coatings obtained in the step S2 are taken and stacked in a sleeved mode, then rotary friction is conducted, and all the taper pipes are welded; and S4, the taper pipe welded in the step S3 is extruded into a block material, then stirring and rotary extrusion are conducted, and the copper graphene composite material is obtained. The method provided by the invention can simultaneously realize the effects of high content and high dispersibility of graphene.

The utility model discloses a hydrogel eyeshade. The hydrogel eyeshade comprises a body, a hydrogel layer, a graphene coating and a heating body, the hydrogel layer is arranged in the mounting cavity, the graphene coating is arranged on the inner surface of the hydrogel layer and located in the mounting cavity, and the two heating bodies are arranged at the positions, corresponding to eyes, of the left side and the right side of the inner side face of the graphene coating and located in the mounting cavity, so that the eyeshade is simple in structure, few in parts and easy and rapid to assemble, and convenience is brought to production; the whole structure of the eyeshade is more compact, the whole size is effectively reduced, and miniaturization arrangement is more facilitated; and through cooperative arrangement of the hydrogel layer and the graphene coating, heat dissipation can be effectively conducted on the eyeshade, eye overheating caused by too concentrated heat in the eyeshade is prevented, the heat dissipation performance of the eyeshade is effectively improved, heat distribution can be more uniform, the product quality is improved, the user experience is improved, and existing requirements are met.