146 results about "Graphene membrane" patented technology

The invention belongs to the technical field of graphite metal composite heat dissipation devices, and provides a flexible graphene film heat conduction cable and a preparation method thereof.The preparation method comprises the steps that the surface of a graphene film is cleaned and punched, and the graphene film with micron-sized pores in the surface is obtained; sequentially plating a layer of active metal film and a layer of heat-conducting metal film on the surface of the graphene film, and cutting to obtain a graphene film; graphene films are overlaid layer by layer to obtain a laminated material, and the two ends of the laminated material are clamped to a hot-pressing mold to be subjected to hot-pressing welding treatment, so that a locally connected flexible heat conduction section is obtained; and the flexible heat conduction section and the heat conduction metal shell are assembled, a soldering lug is placed for brazing and finish machining, and the flexible graphene film heat conduction cable is obtained. According to the method, the internal connection problem of the flexible section is solved by establishing a synergistic process of surface punching, double-layer coating and hot pressing, the heterogeneous connection problem of the flexible section and the shell is solved in a manner of sampling coating and brazing, and through the synergistic effect of all links, the overall performance and reliability of the heat-conducting cable are remarkably improved.

The invention discloses functionalized graphene for removing tritium from radioactive waste liquid and a preparation method and application of a graphene film, the functionalized graphene is a flaky substance formed by stacking lamellar structures, and the distance between the stacked lamellar structures is 7.5-8.7. The preparation method comprises the following steps: preparing graphene oxide powder; performing sulfonation on the graphene oxide powder to obtain sulfonated graphene aerogel; performing carboxylation on the graphene oxide powder to obtain carboxylated graphene; and mixing and stirring the sulfonated graphene aerogel and carboxylated graphene to obtain the functionalized graphene. The tritium in the tritium-containing liquid is separated by utilizing the membrane formed by the functionalized graphene, and the tritium removal technology has the advantages of mild reaction conditions, low energy consumption, easiness in large-scale production and the like.

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.

The invention discloses a graphene-based heat conduction film with a stable interface and a preparation method of the graphene-based heat conduction film. When the graphene film is prepared, a substrate with a reticulate pattern structure with a specific size is utilized, on one hand, separation of a graphene oxide precursor film with high surface energy from a matrix is facilitated, and on the other hand, more stable nucleation sites and interlocking interfaces are provided for in-situ growth of subsequent carbides. According to the in-situ growth method, a layer of superhard carbide coating which is compact in structure and is combined through strong chemical bonds can be generated on the surface of graphene in situ, the carbide coating can form a superstable interface with graphene, the graphene film is effectively protected, and the abrasion resistance, impact resistance and space environment erosion resistance of the graphene film are greatly improved.

According to the graphene film, the graphene film module and the electronic equipment carrying the graphene film or the graphene film module, the graphene film or the graphene film module can emit heat in a power-on state and dissipate heat in a power-off state, and the graphene film or the graphene film module can emit heat in a power-off state; therefore, the heating requirement of the electronic equipment when the electronic equipment is used in a low-temperature environment and the heat dissipation requirement of the electronic equipment when the electronic equipment is used with high power consumption are met.

The invention provides a die-casting forming method of a graphene heat-conducting film, the graphene heat-conducting film and application of the graphene heat-conducting film, and relates to the technical field of graphene films.The die-casting forming method of the graphene heat-conducting film comprises the following steps that graphene oxide powder is scraped to be flat on a graphene oxide film of a first metal plate to be subjected to rewetting treatment; pressing the powder subjected to the rewetting treatment through a graphene oxide film of a second metal plate, and then performing die-casting shaping and high-temperature heat treatment to enable graphene oxide sheet layers to be subjected to self-assembly and demolding, so as to obtain a graphene oxide film with a high-entropy system structure; removing sulfate radicals from the graphene oxide film to obtain the graphene heat-conducting film. According to the preparation method, the disordered and unsystematic sorting characteristic of the graphene oxide powder is utilized, direct die-casting shaping is conducted, a high-entropy system structure is constructed, after the film is formed through high-heat-moisture treatment, sulfate radicals are removed, the graphene heat conduction film with the high Z-axis direction heat conduction performance is obtained, and the problem that the graphene film prepared through a traditional coating technology is low in Z-axis direction performance is solved.

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 application provides a large-area graphene film and a rapid preparation method thereof, and belongs to the technical field of two-dimensional nanomaterials and inorganic film preparation. The preparation method comprises the following steps: adding graphene and an auxiliary agent into a solvent and uniformly mixing to obtain a graphene dispersion liquid; performing blade coating or suction filtration treatment on the graphene dispersion liquid, so that the graphene dispersion liquid is uniformly deposited on a polymer base film; performing drying treatment to obtain a polymer base film with an attached graphene layer; submerging the polymer base film with the attached graphene layer in a solution, so that the graphene layer in the polymer base film with the attached graphene layer is separated from the polymer base film and suspended on the surface of the solution, and the graphene layers are assembled to form a large-area graphene film. The method is based on the graphene dispersion liquid, a graphene conductive film is formed by blade coating or suction filtration, and then a large-area continuous graphene film is assembled on the surface of the solution under the action of the auxiliary agent, so that the production efficiency is high, the device is simple, the cost is low, and the method is suitable for industrialization.

This invention discloses an interlayer confined piezoelectric composite film of graphene oxide, its electric field-driven preparation method, and its application. The preparation method includes: preparing a graphene oxide dispersion using the Hummers method and filtering it to form a graphene oxide film; placing the graphene oxide film in an electric-driven device, introducing different precursor solutions on both sides of the film, and driving the precursor components to migrate into the interlayer confined space of the graphene oxide under the action of an applied electric field; under the synergistic effect of electric field driving and interlayer confinement, the precursors entering the interlayer react and crystallize in situ to form a piezoelectric functional phase. The prepared composite film can generate piezoelectric polarization under mechanical stimulation conditions and can be used for ion selective adsorption / separation, especially suitable for the selective adsorption / separation of uranium and vanadium ions in high-salt water systems. This invention achieves a synergistic improvement in interfacial charge regulation and ion selectivity regulation by constructing a piezoelectric functional phase in situ within the interlayer confined space of graphene oxide.

This invention discloses a coating, winding, and hot-pressing production line for processing multilayer graphene films, relating to the field of graphene film processing equipment, including a coating mechanism, a winding mechanism, and an extrusion mechanism. The winding mechanism of this invention is equipped with an air pump, a take-up rod, a first hollow rod, a second hollow rod, air bladders, and ventilation holes. Before winding the graphene film, the air pump inflates the first hollow rod, causing the two air bladders to expand. The graphene film coated with the coating is then wound onto the two air bladders. A drive assembly rotates the take-up rod, further winding the graphene film onto the two air bladders. When the required thickness of the graphene film wound onto the air bladders is achieved, the graphene film is cut, and the air inside the air bladders is released. The contracted air bladders separate from the rolled graphene film, facilitating the removal of the rolled graphene film from the two second hollow rods.

The invention relates to the technical field of lumbar vertebra supporting, in particular to an intelligent lumbar vertebra supporting control method based on a graphene film and a rehabilitation device.The method comprises the steps that multi-modal data collection is conducted, specifically, multi-modal physiological and motion signals of the waist and abdomen of a user are collected; intelligent state analysis: inputting the multi-mode signal into a pre-trained intelligent control model for analysis and processing, outputting a comprehensive evaluation result of the waist load, muscle tension and thermal comfort of the user, and analyzing the current waist physiological state, specific activity mode and thermal therapy implementation demand of the user; comprehensive self-adaptive regulation and control: generating a cooperative control instruction according to the waist physiological state, the specific activity mode, the spine traction requirement and the thermal therapy implementation requirement which are obtained through analysis; the device comprises a processor and a memory in communication connection with the processor. According to the application, real-time and comprehensive understanding of the waist state of the user is realized, and synchronous and self-adaptive fine regulation and control are performed on two core functions of support and thermal therapy according to the real-time and comprehensive understanding of the waist state of the user.

The invention relates to a preparation method of a graphene film, in particular to a method for preparing a multi-layer graphene film in a double-sided rolling mode. The invention discloses a method for preparing a multi-layer graphene film in a double-sided rolling manner. The method comprises the following steps: (1) alternately winding a metal substrate and a flexible porous isolation material around a rolling center; (2) carrying out high-temperature annealing on the metal substrate / flexible porous isolation material coiled material by using reducing gas; (3) after annealing is finished, carbon source gas / reducing gas mixed gas is introduced, and first-layer graphene film growth is synchronously carried out on the two sides of the metal substrate under the low-pressure condition; (4) after the growth of the first layer of graphene film is finished, introducing oxidizing gas to etch the graphene films on the two sides of the metal substrate; (5) after etching is finished, carbon source gas / reducing gas mixed gas is introduced, and growth of a graphene film is carried out; and (6) repeating the step (4) and the step (5) for N times to obtain an N + 2-layer graphene film.

The application discloses an intercalation large-size graphene oxide-based lithium ion separation membrane and a preparation method and application thereof, and belongs to the technical field of membrane filtration and ion separation. The preparation method comprises the following steps: blending an oxidized graphene solution with an intercalation agent, standing to obtain a mixed solution, depositing the mixed solution on a base film, and drying to prepare a salt water lithium extraction membrane. The application also discloses the application of the graphene oxide-based salt water lithium extraction membrane prepared by the preparation method in the extraction of lithium ions from salt water. The interlayer spacing of the graphene oxide membrane can be adjusted by a specific intercalation agent to realize selective filtration of specific ions. With the increase of the size of the graphene oxide, the mechanical properties and film-forming properties of the large-size graphene oxide are improved, the stability of the membrane is improved, the membrane can be kept stable at a relatively thin thickness, and therefore, the lithium ions in salt lakes or brine can be stably extracted with high selectivity and high flux.

To provide an interference film which is not deteriorated by irradiation with ultraviolet rays, does not change with time even when exposed outdoors for a long period of time, has a surface having water repellency and antifouling properties, has mechanical strength higher than that of a metal film, can freely change a hue emitted by light causing an interference phenomenon, and has noncombustibility and corrosion resistance. Further, the whole surface of the interference film is covered with a coating film excellent in transparency and having a thickness smaller by three digits than the thickness of the interference film to realize the properties of the interference film.SOLUTION: A graphene film 1 having a thickness of 2nm or less and a total light transmission of 85% or more is prepared by joining a group of graphenes in which flat surfaces of the graphenes are overlapped with each other. Further, an interference film having a structure in which the entire surface of a transparent synthetic resin film 2 having a thickness causing an interference phenomenon of reflecting only a light beam having a specified wavelength is covered with the graphene film by friction welding is continuously formed.SELECTED DRAWING: Figure 1

Upgraded coal, method of forming the same, and graphene films and quantum dots made therefrom. A method of upgrading coal includes cleaning coal to form a cleaned coal residue. The method also includes (A) reacting the cleaned coal residue with an oxidizable inorganic metallic agent, or (B) reacting the cleaned coal residue with a reducing agent, or a combination thereof, to form the upgraded coal.

The invention discloses a method of extracting high-purity melanin from Black Soldier Fly(Hermetia illucens)larvae. The methodessentially comprises ofenzymatic breakdown of polymer exoskeleton components, subcritical water extraction, low-pH hydrolysis using formic acid, nanofiltration using graphene oxide membranes, ultrasonic treatment for metal ion removal and crystallization using supercritical CO2 to achieve melanin with purity levels greater than 95%. This method reduces the need for harmful organic solvents and treatment with acids,thereby making the process sustainable and environment friendly.

This invention relates to a system and method for human authentication utilizing a graphene membrane for human skin scanning, imaging, and communication to determine unique neuron patterns for use in authentication and psychological profiling. The system employs a graphene membrane, which integrates unobstructed optical, ultrasound, and capacitance sensors within a distributed computing smartcard format device. The graphene membrane optical sensors capture high-resolution images of fingerprint ridges and valleys, while the ultrasound sensors generate detailed 3D maps of both surface and subsurface skin structures. Capacitance sensors measure the electrical properties of the skin, further enhancing the biometric data obtained. The biometric data is combined and used to identify distinct neuron patterns embedded in the skin. The system may be manufactured in compact card format and durable, ensuring seamless integration into standard identification card formats and to act as a consensus node for Proof-of-KYC (Know Your Customer).

The application discloses a flip chip single particle test heat dissipation system and a heat dissipation method, and the system comprises a heat sink, a semiconductor refrigeration sheet, a graphene film and an insulating gasket, the heat sink adopts a hollow structure form, the hollow area of the heat sink can completely expose a die substrate, and the bottom of the heat sink is attached to the hot end of the semiconductor refrigeration sheet through heat-conducting glue; the semiconductor refrigeration sheet adopts a hollow structure form, the hollow area of the semiconductor refrigeration sheet can completely expose the die substrate; the surface of the graphene film can completely cover the surface of the semiconductor refrigeration sheet and is not hollow; one side of the graphene film is attached to the cold end of the semiconductor refrigeration sheet through heat-conducting glue, and the other side directly covers the die substrate of the flip chip and the insulating gasket. The method is implemented based on the system. The application has the advantages of simple and compact structure, simple operation, good heat dissipation effect, low cost and the like.

This application relates to the field of thermal interface materials technology and discloses a self-adhesive graphene thermal conductive pad and its preparation method. The self-adhesive graphene thermal conductive pad includes a thermally conductive layer and an adhesive layer. The thermally conductive layer includes multiple graphene films and multiple carbon fiber mesh layers spaced apart along the thickness direction. The adhesive layer is disposed on a first surface and a second surface opposite to the first surface of the thermally conductive layer. The adhesive layer has multiple pore structures for reducing thermal resistance, and the pore distribution density of the peripheral region and the central region of the adhesive layer is different. The peripheral region has a first porosity, and the central region has a second porosity. The first porosity is less than the second porosity. This application uses the carbon fiber mesh to naturally form vertical thermal conductive channels. Combined with the gradient porosity design of the adhesive layer, it not only ensures the adhesion reliability of the periphery of the pad but also reduces the thermal resistance of the central region, achieving an efficient balance between adhesion and thermal conductivity.

The application provides a functionalized nanopore graphene membrane applied to mixed ion separation and a preparation method thereof, and belongs to the technical field of ion separation membranes; in the process of CVD growth of graphene, the preparation of functionalized nanopore graphene doped with heteroatoms is realized in one step; or graphene on a metal substrate is used as raw material and is transferred to a nonmetal substrate; vacancy defects are introduced into the graphene on the nonmetal substrate, the vacancy defects are selectively enlarged into nanopores of a specified size, and specific functional groups are non-covalently modified or covalently grafted onto the nanopores, so that the functionalized nanopores realize physical confinement and chemical restraint on specific ions. The application adopts a functionalization method, has high efficiency, controllable types of functional groups, wide reaction selection range, can avoid damage to the nanopore graphene by accurately controlling reaction conditions, realizes directional introduction of specific functional groups on the nanopore graphene, and the prepared nanopore graphene separation membrane has high separation efficiency on mixed ions.

The application belongs to the technical field of environmental functional material preparation, and provides a coordination cross-linking shell-imitating hydrogel super-wetting graphene film material, a preparation method and application thereof. A polyvinyl alcohol-tannic acid (PVA- TA) mixed solution is prepared by using a mixture of ethanol and water as a solvent; then, the solution is mixed with a GO solution to obtain a ternary self-assembled solution; the ternary self-assembled solution is deposited on a base film, and Fe 3+ is used for coordination cross-linking, so that the coordination cross-linking shell-imitating hydrogel super-wetting graphene film is obtained. Through various characterization methods, the physical morphology and wetting characteristics of the composite material are revealed, and the performance of the composite material in separating oil stains and soluble pollutants in water is studied.

The invention relates to the technical field of backlight modules, in particular to a backlight module with a graphite heat dissipation element. The backlight module comprises a light guide plate, a side light inlet of the light guide plate is provided with an FPC and a lamp bead, the edge of the non-light-inlet side of the light guide plate is provided with an anti-dazzling screen, the bottom surface of the light guide plate is provided with a reflecting film, the FPC is connected with an arc-shaped graphite layer through a first heat-conducting glue layer, and the arc-shaped graphite layer is connected with a second heat-conducting glue layer. The other side of the arc-shaped graphite layer is connected with a copper foil through a second heat-conducting glue layer, the copper foil is attached to the outer wall of the glue frame, the exposed part of the copper foil is provided with a black film, and the arc-shaped graphite layer is a flexible composite graphite layer. The ultrathin silica gel heat conduction layer is added in the middle of the flexible composite graphite layer, the flexibility of graphite is enhanced, the graphite is not prone to cracking during bending, the in-plane heat conduction coefficient is further increased through the graphene film, and heat diffusion is added.

The application discloses a multiple-protection power battery stack cover plate and a preparation method thereof. Lightweight and efficient heat insulation are realized through the high porosity and flame-retardant characteristics of melamine sponge. Basalt fiber fabric provides reliable mechanical support for the cover plate through a specific weaving process, taking into account high strength, temperature resistance and environmental protection advantages. The composite design of the heat-conducting porous membrane and the high-thermal-conductivity graphene membrane combines the porous structure and the high-thermal-conductivity performance to build a three-dimensional heat conduction network, effectively solving the problems of battery heat dissipation and local overheating.

The invention relates to the technical field of heat-conducting films, in particular to a bidirectional high-heat-conductivity composite film with a three-dimensional interpenetrating heat-conducting network and a preparation method thereof.The composite film comprises a center layer, bonding layers and outer layers, and the two faces of the center layer are connected with the outer layers through the bonding layers respectively; wherein the middle layer is a graphene-carbon nanotube composite film with a high-density continuous pure carbon structure; the outer layer is a graphene film, the high surface thermal conductivity of the graphene film, the thickness of the graphene / carbon nanotube composite film, the high longitudinal thermal conductivity, the cohesiveness of asphalt graphitization and the high thermal conductivity are utilized, and the porosity in the material is reduced through a gradient heating vacuum hot pressing process; therefore, densification is promoted, longitudinal heat conduction performance is improved, integration is promoted through hot pressing, interface contact thermal resistance is reduced, and step-type improvement of bidirectional heat conduction performance can be achieved.

The utility model relates to the technical field of close-fitting inspectors, in particular to a close-fitting inspector heating plate which comprises a heating plate body, mounting holes used for being connected with equipment are formed in the front side and the rear side of the heating plate body in a penetrating mode, a heating cavity is formed in the heating plate body, and a snakelike heating pipe used for heating is arranged in the heating cavity. The heating plate body is composed of a composite heat insulation layer, the S-shaped heating pipe can be protected inside through the arranged heating plate body, so that the S-shaped heating pipe can be prevented from being damaged due to external collision, heat loss to the environment can be reduced, and the service life of the S-shaped heating pipe is prolonged. And meanwhile, through cooperation of a graphene film, a PEEK adhesive tape layer and a silicon rubber insulating sheet, the insulativity of the device can be improved in the heat conduction process, and the situation that in the cold environment, the snake-shaped heating pipe leaks electricity, and consequently inspection and maintenance personnel are injured is avoided.

This invention relates to the field of sensor technology, and more particularly to a field-effect transistor gas sensor and its fabrication method. From bottom to top, the sensor comprises a doped semiconductor substrate, a composite insulating layer, an interdigitated layered back gate electrode, a graphene film, a boron nitride transition layer, a multi-element alloy ultrathin layer, a source electrode, and a drain electrode. The sensing material is a composite structure of the graphene film, the boron nitride transition layer, and the multi-element alloy ultrathin layer. This invention effectively solves the problems of high control voltage and uneven electric field distribution in traditional devices through structural innovation in the composite insulating layer and the interdigitated layered back gate electrode. The composite insulating layer, composed of an Al2O3 bottom layer and a HfO2 top layer, achieves a high dielectric constant ≥25 with a thickness ratio of (2-3):1, with a total thickness of only 20-50 nm. While ensuring insulation performance, it reduces the control voltage. Combined with the layered back gate structure with an interdigital spacing of 50-100 μm and 8-12 pairs of interdigitates, it significantly improves the electric field uniformity and control coverage, increasing device response consistency by more than 50% and reducing the control voltage by 40% compared to traditional structures.

The invention discloses a graphene / molybdenum disulfide heterojunction transfer cleaning method based on supercritical fluid, and belongs to the technical field of two-dimensional material device preparation and micro-nano machining. According to the method, a PMMA / graphene film and a MoS2 substrate are subjected to the following operations: soaking and cleaning the PMMA / graphene film and the MoS2 substrate with acetone at least twice, washing the PMMA / graphene film and the MoS2 substrate with isopropyl alcohol (IPA) twice, blow-drying the PMMA / graphene film and the MoS2 substrate with nitrogen, cleaning with supercritical CO2 and drying; the graphene film is transferred to the cleaned MoS2 surface through PMMA again, then supercritical CO2 cleaning is carried out, and the graphene / MoS2 heterojunction is obtained. According to the method, PMMA residues and organic pollutants are efficiently removed through the characteristics of high permeability, high solubility and no capillary force of the supercritical fluid, so that the cleanliness of a heterojunction interface of the two-dimensional material is remarkably improved, the carrier mobility is improved, and the contact resistance is reduced. The method is suitable for removing pollutants in the two-dimensional material transfer process, and can effectively improve the interface cleanliness and the electrical properties of the device.

The invention relates to the technical field of graphene material preparation and membrane separation, and provides a gravity-driven Joule thermal graphene membrane and a preparation method and device thereof. The preparation method is inspired by a multilayer-grading water purification structure evolved from the nature for a long time, a biomass-based carbon material is converted into a graphene material with a disordered layer structure through Joule thermal reaction, and then the graphene material is subjected to directional oxidation treatment to form a graphene film with a grading water transmission channel and a multilayer screening water purification structure; the graphene film can efficiently remove organic pollutants and heavy metal ions only through gravity driving under the condition of no external pressure, and the water flux is high. The invention further provides a special separation device matched with the graphene film, the special separation device comprises a water inlet unit, a film bin and a water outlet unit which are sequentially communicated from top to bottom, the separation device completely gets rid of dependence on an external force driving device, efficient separation of pollutants under the pressure-free condition is achieved, and system operation energy consumption and complexity are remarkably reduced.

The invention belongs to the technical field of composite material curing forming, and particularly relates to an in-situ uniform heating curing forming device and method for a helicopter skin composite material. The device comprises a forming mold, a temperature control system and a vacuum system, the forming mold comprises a bottom supporting block and a graphene heating layer arranged on the upper surface of the bottom supporting block. The graphene heating layer sequentially comprises upper tooling cloth, a graphene film, a heat insulation material and lower tooling cloth from top to bottom; a plurality of groups of electrodes and thermocouples are distributed in the graphene film; the heat insulation material is used for preventing heat from being conducted downwards; the lower tool cloth is in contact with the upper surface of the bottom supporting block; the temperature control system receives a measurement signal from the thermocouple and controls the heating power of the electrode according to the measurement signal; based on real-time temperature information sensed by a thermocouple, heating power of electrodes at different positions is controlled, so that a graphene edge area with relatively fast heat dissipation and a central area with relatively slow heat dissipation have the same heating rate, and the temperature uniformity of a graphene film is ensured, so that the prepreg is uniformly heated; the vacuum system is arranged outside the forming mold and used for forming and maintaining a vacuum environment in the curing forming process.

The invention relates to the technical field of graphene films, in particular to a high-thermal-conductivity graphene film and a preparation method thereof.According to the high-thermal-conductivity graphene film and the preparation method thereof, through surface modification of boron nitride nanopowder and introduction of active hydroxyl groups to the surface of the boron nitride nanopowder, the interface bonding force of boron nitride and a polyimide matrix can be enhanced, and an efficient heat conduction path is formed; through cooperation with synergistic dispersion of calcium carbonate whiskers, a three-dimensional heat-conducting network can be constructed in a polyimide matrix, so that the heat conductivity of the graphene film is improved; the inorganic particle dispersion liquid is subjected to surface modification by adopting a silane coupling agent KH-550, high-speed shearing and glass bead grinding are combined, and uniform dispersion of nano particles can be realized, so that performance fluctuation caused by agglomeration is avoided, the bubble defect is eliminated through defoaming treatment, and the film forming uniformity can be ensured; the polyimide film is subjected to stepped heating curing, the internal stress can be effectively reduced, cracks are avoided, the graphite microcrystal orientation can be further optimized through carbonization and graphitization treatment, and the film material has the performance of high heat conductivity and high mechanical strength.