257 results about "Graphene flake" patented technology

The invention discloses a graphene microchip dip-coating device for a PCB (Printed Circuit Board) substrate, and relates to the technical field of circuit board processing. Comprising a gantry moving frame, a plurality of treatment grooves and a mounting rod, and a plurality of clamping units distributed at equal intervals are arranged on the mounting rod; the clamping unit comprises a U-shaped frame which is erected on the mounting rod, the U-shaped frame is provided with a fixed clamping frame, the fixed clamping frame is fixedly connected with a positioning block and hinged to a movable clamping frame, and a supporting piece is fixedly connected to the side, close to the positioning block, of the movable clamping frame. The movable clamping frame is supported and limited through the supporting piece, when the base plate is clamped, the base plate only needs to be moved, the supporting piece is pushed through the base plate, the supporting piece relieves limiting of the movable clamping frame through the supporting piece, and then the base plate can be clamped and fixed, so that the step that all clamps are fastened one by one is omitted, and the clamping efficiency is improved. The probability that the substrate deflects during the clamp fastening process is reduced, the operation steps are simplified, and then the dip-coating and electroplating efficiency is improved.

The invention discloses a high-temperature-corrosion-resistant stainless steel gas distribution disc and a preparation method thereof, and relates to the technical field of stainless steel machining, stainless steel is subjected to micro-arc oxidation treatment, the high temperature resistance and wear resistance of the surface of the stainless steel are improved, but the corrosion resistance of the stainless steel subjected to micropore treatment needs to be improved. Stainless steel subjected to micro-arc oxidation treatment is subjected to titanium dioxide layer plating treatment, micro-arc oxidation holes provide additional anchoring points, titanium dioxide layer plating treatment is carried out on the basis, the corrosion resistance of the stainless steel is improved, micro-arc oxidation treatment is firstly carried out on the surface of the stainless steel, then titanium dioxide is plated on the surface of the stainless steel, and the corrosion resistance of the stainless steel is improved. And the binding force between the titanium dioxide layer and the stainless steel substrate can be obviously improved. The graphene oxide-titanium dioxide composite sol is added into the electroplating solution, invasion of corrosive media is effectively blocked, the diffusion path of the corrosive media is prolonged through the graphene sheet layer, and the corrosion resistance of the stainless steel is further improved.

The invention discloses a graphene film / copper hot-pressing composite directional high-thermal-conductivity material as well as a preparation method and application of the graphene film / copper hot-pressing composite directional high-thermal-conductivity material. The preparation method comprises the following steps: punching a graphene film to form a plurality of hole structures; blade-coating copper paste on the surface to form a liquid film; the copper paste comprises copper powder, a coupling agent and an organic phase; stacking a plurality of layers; carrying out hot pressing treatment on the circulating laminated structure; and slicing to obtain the graphene film / copper hot-pressing composite oriented high-thermal-conductivity material. When copper powder particles are embedded into the hole structure, the whole hole structure is filled with the copper powder particles, the copper powder particles can transversely enter gaps between graphene sheet layers, a three-dimensional interlocking structure is formed through the sintering effect, resin contained in the copper paste can be subjected to a carbonization reaction in the glue discharging stage, a carbon skeleton is formed, and therefore the three-dimensional interlocking structure is formed. And the infiltration process between the copper powder and the graphene sheet layer is facilitated, and finally the heat conduction performance and the mechanical performance of the graphene film / copper hot-pressing composite oriented high-heat-conduction material are remarkably improved.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength bismaleimide resin material and a preparation method thereof. The bismaleimide resin composition comprises the following components in parts by weight: 50-60 parts of bismaleimide resin, 40-50 parts of an allyl compound, 1-3 parts of modified graphene and 0.1-0.5 part of a dispersing filler, the dispersing filler is prepared from modified inorganic nanoparticles and modified tetrapod-like zinc oxide whiskers in a mass ratio of (0.1-1): 1. Wherein the tetrapod-like zinc oxide whiskers can promote the dispersion of the graphene with a large lamellar structure from the macroscopic aspect, so that the graphene is uniformly dispersed in a bismaleimide resin matrix, and the inorganic nanoparticles can play a role in lubrication and isolation, so that the agglomeration among graphene lamellas in a small range is prevented. By adding the graphene composite reinforcing filler, the rigidity of the bismaleimide resin material is improved, and the toughness of the composite material can be improved at the same time.

The invention provides a negative pole piece, a secondary battery, an electric device and a hard carbon material.The negative pole piece comprises a negative current collector and a negative film layer located on at least one surface of the negative current collector, the negative film layer comprises the hard carbon material, and the hard carbon material comprises a graphene sheet layer; the space volume H1 between the graphene sheet layers with the interlayer spacing larger than 0.4 nm and the total space volume Htotal between the layers in the graphene sheet layers meet the condition that H1 / Htotal is larger than or equal to 40% and smaller than or equal to 60%. As a result, the dynamic performance and the first coulombic efficiency of the secondary battery can be achieved at the same time.

The invention discloses a preparation method of a high-elasticity low-thermal-impedance graphene thermal interface material, which comprises the following steps: vertically dripping graphene oxide slurry on a substrate to form a graphene oxide gel array with a pre-oriented structure, and finally depositing the graphene oxide slurry on the surface to obtain the high-elasticity low-thermal-impedance graphene thermal interface material. And drying to obtain a graphene oxide film with certain vertical orientation inside, and carrying out chemical reduction foaming and high-temperature graphitization to obtain the thermal interface material. In the foaming process, oxygen-containing functional groups on the surface of the graphene oxide are converted into gas, graphene sheets are expanded, physical crosslinking is formed at the edge lap joint positions of the graphene sheets due to the pi-pi conjugation effect, and a quadrilateral-like structure is formed. Compared with a horizontally formed graphene film, the material has the advantages that the proportion of the internal graphene sheets arranged along the vertical direction is higher, the horizontal heat conduction capability is improved, better compression resilience is provided, the thermal impedance is reduced, and the material has wide application potential in the field of thermal interface materials.

This invention relates to the field of graphene preparation technology and provides a method for preparing low-defect graphene powder using a high-temperature molten salt intercalation and instantaneous expansion method. First, a graphite / molten salt composite electrode is prepared. Then, salt is intercalated into the graphite using an electrochemical intercalation method. Finally, the intercalated graphite is exfoliated into thin-layer graphene using a negative pressure high-power microwave exfoliation method or a normal pressure high-temperature quenching exfoliation method. The raw materials used in this invention are low-cost and environmentally friendly, and the production process is safe and efficient. Through the optimized combination of molten salt electro-assisted intercalation technology and the instantaneous expansion method, the prepared graphene not only has a layer count controlled at 3-5 layers and a flake size of 25-300 μm, but also exhibits few defects on the graphene flakes, providing strong technical support for promoting the high-quality development of related industries.

The invention belongs to the technical field of epoxy resin coatings, and particularly relates to a novel anti-static corrosion-resistant epoxy coating and a preparation method thereof. The preparation method comprises the following steps: performing amination modification on graphene oxide through p-phenylenediamine, performing in-situ growth of a corrosion inhibitor-loaded graphene-polyaniline microcapsule by taking amido as a binding site, blending the corrosion inhibitor-loaded graphene-polyaniline microcapsule with a carbon nanotube, and adding the mixture into an epoxy coating to construct an antistatic-corrosion-resistant integrated functional coating. The polyaniline capsule is used as an intercalator, so that the interlamellar spacing of the graphene can be increased, the aggregation is reduced, and the dispersity is optimized. Meanwhile, the graphene sheet layer of the two-dimensional structure forms a labyrinth effect, the diffusion path of a corrosive medium is prolonged, and the physical shielding property of the coating is enhanced. In addition, after the corrosion inhibitor is loaded on the core-shell structure of the polyaniline capsule, the corrosion inhibitor can be released under the stimulation of positive ions, and the coating is endowed with an active defense function. And the polyaniline capsules are conductive and are in lap joint with the graphene and the carbon nanotubes to form a three-dimensional conductive network, so that the coating has an anti-static function.

The application discloses a flexible terahertz metamaterial sensor and a preparation method thereof, which comprises, from top to bottom, a reinforcing layer, a carbon nanotube film layer and a polymer substrate layer; the reinforcing layer is composed of a graphene and zinc oxide composite material; the reinforcing layer and the carbon nanotube film layer are consistent in shape and are both periodic strip structures. The super material sensor is based on the synergistic effect of a ternary system of zinc oxide / graphene / carbon nanotube, wherein zinc oxide nanoparticles grow directionally on a graphene sheet through a Zn-O-C bond, and a carbon nanotube film constructs a three-dimensional conductive network, thus solving the dielectric loss problem of a traditional noble metal-based sensor structure. The phonon resonance characteristics of zinc oxide are coupled with graphene plasmons, a high-efficiency charge transfer channel is formed at a heterojunction interface, and the conductivity and terahertz transmission efficiency are improved.

The utility model relates to the technical field of refrigerators, in particular to a fresh-keeping refrigerator combining air cold-heat exchange with direct cooling and circulation control refrigeration, which comprises a refrigerator, an exhaust fan is arranged in an inner cavity of the refrigerator, a compressor is arranged in the inner cavity of the refrigerator, a condenser is arranged at the bottom end of the inner cavity of the refrigerator, and a plurality of graphene sheets are arranged in the inner cavity of the refrigerator. Wheels are arranged at the bottom end of the refrigerator, a plurality of goods shelves are sequentially arranged in an inner cavity of the refrigerator from top to bottom, an exhaust outlet is formed in the rear side of the inner cavity of the refrigerator, capillary tubes are fixedly embedded in the inner cavity of the side wall of the refrigerator, a controller is arranged on the refrigerator, and a monitoring assembly is arranged in the inner cavity of the refrigerator. The fresh-keeping refrigerator combining air cold and heat exchange with direct cooling and circulating control refrigeration adopts the combined application of various systems and modules, the refrigerator design is divided into the combined application of a video area and a refrigerator fresh-keeping area, and an air (oxygen) cold and heat exchange technology and a dynamic mode are adopted.

The invention provides a preparation method of a graphene film with high thermal conductivity in a Z-axis direction, the graphene film with high thermal conductivity in the Z-axis direction and application of the graphene film, and relates to the technical field of graphene. The preparation method comprises the following steps: carrying out air crushing treatment on low-solid-content graphene oxide slurry to enable micron-sized air bubbles to be attached to the surface of a sheet layer of graphene oxide, so as to obtain low-solid-content gas-dissolved graphene oxide slurry; preparing the low-solid-content dissolved gas graphene oxide slurry into high-solid-content dissolved gas graphene oxide slurry; carrying out homogenizing and stripping treatment on the high-solid-content gas-dissolved graphene oxide slurry to obtain homogenized graphene oxide slurry; the homogenized graphene oxide slurry is subjected to coating, drying and heat treatment in sequence, and the graphene film with the high thermal conductivity in the Z-axis direction is obtained. According to the preparation method disclosed by the invention, the tiling order of the graphene sheet layers in the X-Y direction is broken, and the cardinal number of the graphene sheet layers arranged in the Z-axis direction is increased, so that the heat-conducting property in the Z-axis direction is improved.

The invention discloses a preparation method and application of a graphene / titanium alloy electron beam cladding coating for inhibiting generation of TiC, and belongs to the technical field of titanium-based composite materials and preparation thereof. The method solves the technical problem that a TiC phase is easily generated in situ when the titanium alloy is subjected to surface enhancement by the existing graphene. According to the preparation method, the reaction of graphene and titanium alloy is inhibited through SiC, a C-Ti reaction path is inhibited from the source, and meanwhile, the depth of a molten pool is regulated and controlled by regulating and controlling electron beam current parameters, so that the dilution rate of the C element is controlled, the C element is subjected to complete solid solution in a matrix, TiC is not generated, TiC-phase-free coating preparation is realized, a graphene lamellar structure is completely reserved, and the preparation process is simple. The core advantages of self-lubrication and high mechanical strength are brought into full play, and the coating performance damage caused by TiC generation is avoided.

The present invention relates to a planar heating element comprising: a heating layer including graphene flakes, functionalized graphene and a nanohybrid material; and an electrode electrically connected to the heating layer, wherein the nanohybrid material has the functionalized graphene self-adsorbed on the surfaces of thermally conductive inorganic particles.

The invention discloses a production process for preparing graphene by extracting graphite from coal, relates to the technical field of preparation of carbon nanomaterials, constructs an integrated process for extracting graphite from coal and preparing graphene, adopts composite weak oxidation mild activation, in-situ intercalation and low-energy ultrasonic synergistic turbulence stripping, and synchronously recovers resources. The method abandons the traditional strong oxidation and secondary treatment, and has the advantages that by adopting the coal raw material pretreatment-pyrolysis reduction to extract the coarse graphite and combining the integrated process of mild activation of a composite weak oxidation system, in-situ intercalation modification and low-energy ultrasonic synergistic turbulence stripping, a strong oxidant used in the traditional chemical oxidation method is abandoned; the problems of generation of a large amount of acid wastewater and equipment corrosion are avoided from the source, meanwhile, the process collaboration is optimized according to the structural characteristics of the coal derived graphite, secondary crushing and purification are not needed, the material loss is reduced, and the problems of graphene sheet layer fracture and excessive defects are effectively solved.

The invention belongs to the field of carbon-based electrode materials, and discloses a three-dimensional structure graphene material loaded with phosphorus-doped carbon nitride quantum dots as well as a preparation method and application of the three-dimensional structure graphene material. The three-dimensional structure graphene material is prepared through a simple hydrothermal reaction, phosphorus-doped carbon nitride quantum dots are uniformly dispersed on a graphene sheet layer, and nitrogen and phosphorus are successfully introduced into graphene through in-situ loading of the phosphorus-doped carbon nitride quantum dots. The graphene material with the three-dimensional structure integrally presents a good self-supporting three-dimensional skeleton structure, an electrode can be directly prepared under the condition that a conductive agent and a binder are not added, and the supercapacitor taking the graphene material with the three-dimensional structure loaded with the phosphorus-doped carbon nitride quantum dots as the electrode shows excellent electrochemical performance; wide application prospects are realized in the fields of electrode materials and energy storage devices.

The invention discloses a preparation process of a graphene reinforced tear-resistant composite material for a rubber conveying belt. The preparation process comprises the following specific steps: S100, modifying graphene; s200, pretreatment of a rubber matrix; s300, carrying out sectional type mixing; s400, forming treatment is carried out; s500, gradient vulcanization treatment is carried out; and S600, post-treatment is carried out. According to the invention, a mode of synergistically modifying graphene by using the silane coupling agent and the ionic liquid is adopted, so that the technical bottleneck that the modification effect of the existing single modifier is limited is broken through, Van der Waals force between graphene sheet layers is effectively destroyed, the technical problem of graphene agglomeration is solved, and a large number of active functional groups are grafted on the surface of graphene, so that the preparation method is simple and convenient. The interfacial compatibility of the graphene and the rubber matrix is remarkably improved, so that the graphene can be uniformly dispersed in the rubber matrix, and the ultrahigh-strength enhancing effect of the graphene is fully exerted. A sectional type mixing process is adopted, and different mixing temperatures, rotating speeds and time are controlled in three sections according to the characteristics of graphene and action mechanisms of different auxiliaries.

The application belongs to the field of nanometer material in environmental monitoring application, and discloses a fluorescence immunoassay method for detecting ovalbumin concentration based on carbon quantum dots, which comprises the following steps: using L-glutamic acid as a precursor, one-step preparation of carbon quantum dots with amino groups by ultrasonic hydrothermal method; using a reduced graphene oxide method to prepare graphene sheets, and optimizing the graphene by modifying polydiallyldimethylammonium chloride to obtain graphene sheets which can have good fluorescence resonance energy transfer with the carbon quantum dots with amino groups; and coupling the prepared carbon quantum dots with amino groups with a monoclonal antibody. The application directly prepares carbon quantum dots with amino groups by one-step hydrothermal method, and the quantum dots can be directly coupled with a monoclonal antibody. The carbon quantum dots involved in the application avoid the aminoization step, and the linear range can reach 0.1 ng / mL-3000 ng / mL.

Provided is a composite thin film current collector for a battery or supercapacitor, the thin film comprising graphene sheets dispersed in or bonded by an electron-conducting polymer network (also referred to as conducting network polymer, crosslinked polymer, or hydrogel polymer) wherein the composite thin film has a thickness from 2 nm to 500 μm and an electrical conductivity from 10−4 to 104 S / cm and wherein the graphene sheets occupy from 10% to 99% by weight and the polymer network from 1% to 90% by weight of the total composite weight.

Technologies for acoustoelectronic manipulation of micro / nano particles include a system having a piezoelectric substrate coupled to one or more acoustic transducers and a fluid layer positioned above the substrate. Micro / nano particles are introduced to the fluid, which can be in the form of a droplet or in a confined channel, and a signal is applied to the acoustic transducer. One or more parameters of the signal are varied after introducing the micro / nano particles into the fluid. The parameters may include amplitude, frequency, or phase of the signal. The system may include one or more acoustic transducers. Multiple signals may be applied to the acoustic transducers. Wave superposition of acoustic waves in the substrate manipulates micro / nano particles in the fluid. The nanoparticles may include carbon nanotubes, nanowires, nanofibers, graphene flakes, quantum dots, SERS probes, exosomes, vesicles, DNA, RNA, antibodies, antigens, macromolecules, or proteins.

An electrode active layer is disclosed that includes a network of high aspect ratio carbon elements (e.g., carbon nanotubes, carbon nanotube bundles, graphene sheets, etc.) that provide a highly conductive scaffold that entangles or entangles the active material, thereby supporting the layer. A surface treatment can be applied to the high aspect ratio carbon elements to promote adhesion to the active material and any underlying electrode layers, thereby improving the overall cohesion and mechanical stability of the active layer. The surface treatment forms only a thin (in some cases even monomolecular) layer on the network, thereby leaving large void spaces free of any bulk adhesive material and which can be filled, instead, with the active material. The resulting active layer can be formed with excellent mechanical stability, even under large thicknesses and high active material mass loadings.

The utility model discloses a laser trepanning mechanism for graphene sheets, which comprises a bottom plate, a workpiece carrying table is arranged on the bottom plate, a support frame is provided with an adjusting seat, a laser head is arranged on the adjusting seat, and a workpiece fixing structure is arranged on the workpiece carrying table; the workpiece fixing structure comprises a two-way ball screw, the two-way ball screw is rotationally arranged in the support, a first nut and a second nut are arranged on the two sides of the two-way ball screw, and a first air conveying pipe and a second air conveying pipe are arranged at one end of the first nut and one end of the second nut correspondingly. A first adsorption head and a second adsorption head are arranged on the first gas conveying pipe and the second gas conveying pipe, and are movably arranged in the adjusting opening; according to the graphene sheet perforating device, graphene sheets of different specifications can be adsorbed and fixed, the stability of the graphene sheets in the perforating process is improved, smoke can be treated, and the situation that the smoke pollutes the air quality of a workshop is avoided.

The invention provides graphene hydrophilic conductive carbon paste and a preparation method thereof. According to the graphene hydrophilic conductive carbon paste provided by the invention, the aminated carbon nanotubes are added, so that the repulsive interaction between graphene sheet layers is favorably increased, graphene agglomeration is prevented, and the dispersity and the stability are improved. Meanwhile, the graphene is of a two-dimensional lamellar structure and can construct a three-dimensional conductive network structure with the aminated carbon nanotubes, the conductive nano carbon black and the conductive graphite, and the conductivity of a conductive layer formed after the graphene hydrophilic conductive carbon paste is cured can be remarkably improved. According to the graphene hydrophilic conductive carbon paste, the carboxymethyl cellulose and the humic acid are added, and the dispersion stability of the graphene hydrophilic conductive carbon paste can be remarkably improved through matched use of the carboxymethyl cellulose and the humic acid. The water-based adhesive is used as a bonding substance, and the dispersion stability of the graphene, the aminated carbon nanotubes, the conductive nano carbon black and the conductive graphite in water can be further improved by using the dispersing agent.

The invention relates to the technical field of heat conduction materials, in particular to a lightweight composite high-heat-conduction material and a preparation method thereof. Based on a'filler-matrix-interface 'ternary structure of a high-thermal-conductivity composite material, the dispersity of the thermal-conductivity filler in a matrix and the interface bonding strength of the filler and the matrix are effectively improved by adjusting a resin matrix, filler types and process parameters, and the carbon fibers and the graphene sheet layers are mutually connected to form a continuous thermal-conductivity path, so that the thermal conductivity of the composite material is improved. The heat is transmitted along a set direction, a more effective conduction communication network is formed, finally, the electric conduction and heat conduction capabilities of the composite material are greatly improved, a complex synthesis technology is not needed, the process is simple, the energy consumption is low, the production cost is low, and the composite material is suitable for large-scale production and application; the lightweight high-thermal-conductivity material has the characteristics of stable thermal cycle, high thermal conductivity and low density, and has a very wide application prospect in the field of sealing materials of hypersonic aircrafts, aircrafts and electronic products.

The utility model discloses an efficient building heat preservation material containing graphene, and relates to the technical field of building materials, the efficient building heat preservation material containing graphene comprises a heat preservation wallboard, a starting piece, a board connecting piece and a corner connecting piece, the heat preservation wallboard is sequentially adhered with a base layer, a first heat insulation layer, a sound insulation and shock absorption layer, a second heat insulation layer and an outer protection surface layer from inside to outside; the first heat insulation layer and the second heat insulation layer comprise a heat insulation base layer, a graphene modified middle layer and a porous heat insulation layer, the first heat insulation layer and the second heat insulation layer form a double-layer heat insulation system, and a nanometer micropore heat insulation material of the heat insulation base layer limits heat conduction of gas; a graphene sheet layer in the graphene modified middle layer and nano ceramic particles have a synergistic effect to reduce the heat transfer rate, the porous heat insulation layer prevents multiple heat propagation modes by utilizing a porous structure and filling aerogel, and the structure greatly improves the heat insulation efficiency of the heat insulation wallboard.

The utility model discloses a graphene surface detector for graphene detection, and relates to the field of graphene detection. The device comprises a bottom plate and a hollow pipe, the top surface of the bottom plate is fixedly connected with the hollow pipe, and the bottom plate is provided with a lifting mechanism and an adjusting mechanism. By arranging the adjusting mechanism, a second motor can be driven to drive a two-way threaded rod to rotate, so that two third connecting plates on the two-way threaded rod are far away from each other or close to each other, when the two third connecting plates are close to each other, a gear on a rotating rod can be driven to rotate on a rack, and meanwhile, the two third connecting plates are slowly rotated; when the two third connecting plates are far away from each other, the illumination range is expanded, the light is relatively dispersed, the illumination intensity of the graphene sheets is effectively controlled, and thus the image definition and the detection accuracy are improved; therefore, an observer can clearly identify tiny defects or structural features on the surface of the material.

This invention discloses a highly dispersible graphene elastomer multifunctional masterbatch and its preparation method, belonging to the field of polymer composite materials technology. The masterbatch, based on a total mass of 100 parts, comprises 50-65 parts graphene, 25-40 parts elastomer carrier, 2-6 parts composite dispersant system, and 3-9 parts compatibilizer; the graphene sheet surface is modified with flexible molecular chains, with the modification amount being 2%-8% of the graphene mass. The preparation method employs a three-stage dispersion strategy: liquid-phase nano-dispersion, solid-phase shear dispersion, and interface stabilization. Nano-silica is added at the end to suppress sheet re-stacking during melt cooling. This invention achieves simultaneous improvement in strength and toughness under ultra-high filling conditions, is applicable to various thermoplastic elastomers, and has strong process versatility.

The utility model relates to a heat-conducting consumable, in particular to heat-conducting silicone grease which comprises a body, the body is provided with an upper high filler layer and a lower high filler layer, the upper high filler layer is in a square shape, the inner side of the upper high filler layer is filled with a low filler layer, a containing groove is formed in the bottom of the lower high filler layer, and the lower high filler layer is filled with a heat-conducting material. The containing groove is filled with a protective filler layer, a graphene sheet is arranged on the inner side of the protective filler layer, the graphene sheet is attached to the bottom of a low filler layer, and the low filler layer and the protective filler layer are the same in component. The heat-conducting silicone grease has the advantages of being reasonable in design and high in heat-conducting performance, heat in electronic components can be more efficiently conducted out through the graphene sheets inside the heat-conducting silicone grease, the temperature of the electronic components can be reduced, the heat-conducting silicone grease can be evenly spread on the surfaces of the electronic components, the probability that the heat-conducting silicone grease overflows unevenly is reduced, and the heat dissipation performance is guaranteed.

This application provides a thermal conductive agent, its preparation method, and an elastomer. The preparation method includes: providing graphene material, an oxidant, and a polymer material; mixing the graphene material and the oxidant in a certain proportion to obtain a mixture; subjecting the mixture to mechanochemical treatment, cleaning, and drying to obtain edge-hydroxylated graphene; mixing the edge-hydroxylated graphene with the polymer material in a certain proportion and performing an exfoliation process to obtain the thermal conductive agent. Using the preparation method provided in this application, the oxidant can capture electrons from the edge carbons of the graphene under the action of mechanical energy, introducing hydroxyl functional groups at the edges of the graphene sheets. This improves the compatibility of graphene and the polymer material during subsequent exfoliation, while maintaining the complete π-π conjugated structure in the middle of the graphene, which is beneficial for the transport of electrons and phonons, giving the thermal conductive agent high thermal conductivity, high carrier mobility, and excellent mechanical strength.

The invention discloses carbon nanotube / graphene composite hyperboloid graphite carbon foam and a preparation method thereof.Carbon nanotubes are introduced into a graphene foam material, and the carbon nanotubes can fix a graphene sheet layer and restrain the characteristic that a graphite crystal sheet layer is prone to sliding under the ultra-high-temperature condition, so that the carbon nanotube / graphene composite hyperboloid graphite carbon foam is obtained; meanwhile, a lattice structure of the graphene material is constructed through high-temperature graphitization, so that the material still has relatively good elasticity and flexibility under an extreme high-temperature condition, the problem of poor elasticity of graphitized carbon foam is solved, and the material can be effectively applied to the field of extreme high-temperature thermal interface materials.

The utility model relates to the technical field of radiators, and discloses a water-cooling plate type radiator, which comprises a lower radiating plate, an upper radiating plate is arranged at the upper end of the lower radiating plate, and joints are arranged at the front ends of the lower radiating plate and the upper radiating plate. In the assembling process of the water-cooling plate type radiator, the grooves of the lower radiating plate and the upper radiating plate are aligned with the alignment strips and then attached to the alignment strips, then the upper radiating plate is pushed, the lower check blocks are connected with the butt joint grooves in an inserted mode, the lower radiating plate and the upper radiating plate are positioned and assembled, and the upper flow channel and the lower flow channel are aligned and combined, so that the time and energy consumption of adjustment and alignment is reduced, and the production efficiency is improved. The lower heat dissipation plate and the upper heat dissipation plate are tightly fused into a whole in a brazing connection mode, rapid and accurate assembling and positioning are achieved, the heat conduction efficiency of the radiator is greatly improved through the heat conduction pieces made of graphene pieces, heat generated by a heating source can be rapidly conducted to the whole heat dissipation plate and rapidly dissipated out, and the heat dissipation effect is good.