370 results about "Graphene flake" patented technology

The invention discloses a calcining carbon removal-supercritical expansion stripping method for regenerating graphene from graphite of a waste lithium battery, and belongs to the field of lithium battery recovery and nano material preparation. Comprising the following steps: treating the waste lithium battery to obtain waste lithium battery positive and negative electrode mixed powder, and then roasting to obtain battery powder; leaching the battery powder in a nitric acid solution to obtain purified graphite slag; the method comprises the following steps: mixing graphite slag with supercritical gas fluid, treating, quickly releasing pressure to normal pressure, and separating to obtain graphene. According to the method, on the basis of interlayer structure characteristics of the waste graphite negative electrode, organic matters and amorphous carbon are removed through multi-stage calcination, a supercritical N2 / CO2 mixed fluid permeation and pressure relief expansion synergistic stripping technology is combined, and low-damage dissociation is achieved through graphite microcracks. According to the method, physical stripping and liquid nitrogen shock cooling strengthening are coupled, and the obtained graphene sheet layer is high in integrity and few in structural defect and can be directly used for manufacturing conductive composite materials and energy storage devices.

The invention provides a compressible high-thermal-conductivity graphene thermal interface material and a preparation method thereof. The preparation method comprises the following steps: preparing a graphene oxide film with low structural unit thickness by adopting a centrifugal spin-coating film casting method, performing limited thermal expansion delamination, compounding with polysiloxane, and performing directional lamination to obtain a highly-oriented graphene / organic silicon composite material. And applying shear stress after pressurizing and densifying along the normal direction of the graphene sheet layer, so that the graphene structure unit forms a continuous buckling structure which is high in density and easy to compress. The densification process promotes the interaction among delamination structure units, broadens a phonon transmission channel, inhibits phonon-boundary scattering, enhances the comprehensive heat-conducting property, plays a role in promoting stress transmission among graphene, and ensures the formation of a continuous buckling structure under shear stress. A continuous buckling structure and a relatively low structure unit thickness (llt in the graphene structure unit; and the compression modulus of the densified vertical graphene array is jointly reduced by means of high density, high thermal conductivity and high compressibility of an existing thermal interface material, and the method can be applied to the fields of new energy automobiles, high-power chips, aerospace electronic equipment and the like, and the problem that high density, high thermal conductivity and high compressibility of the existing thermal interface material are difficult to consider at the same time is solved.

The invention discloses a three-dimensional (SBC-HIE-FDTD) method for efficiently calculating the propagation characteristics of electromagnetic waves in a graphene dispersive medium on the basis of a mixed explicit-implicit finite difference time domain (HIE-FDTD) method and a surface boundary condition (SBC) of the graphene, and the three-dimensional SBC-HIE-FDTD method is used for efficiently calculating the propagation characteristics of the electromagnetic waves in the graphene dispersive medium. According to the three-dimensional SBC-HIE-FDTD method for efficiently calculating the electromagnetic field in the graphene dispersive medium, the advantages of the HIE-FDTD method in thin dielectric layer modeling and the advantages of the SBC method in the aspect of zero-thickness graphene sheet modeling are fused, so that the size of a small grid caused by a graphene sheet or a thin dielectric layer does not limit the time step length any more; compared with other simulation methods based on a graphene structure, the method has the advantages that the calculation efficiency is better, and the method is particularly suitable for analysis and simulation of radio wave propagation characteristics in a terahertz graphene absorber structure.

An energy harvesting device is provided. The device includes a patterned graphene sheet arranged on a substrate, wherein the graphene sheet contains channels; a perovskite composition arranged on the graphene sheet, wherein the perovskite composition conforms to the channels of the graphene sheet; and a luminescent material composition or a 2D material composition arranged on the perovskite composition. The device is configured to convert electromagnetic radiation and / or thermal energy to an electrical signal.

The invention discloses a silicon carbide / graphene composite material and a preparation method thereof, the composite material is of a three-dimensional network structure generated through in-situ reaction of multilayer graphene and silicon powder, silicon carbide nanowires in the structure are distributed on graphene sheets, the length of the silicon carbide nanowires is 1-5 microns, the diameter of the silicon carbide nanowires is 50-100 nm, and the silicon carbide nanowires are in a beta-SiC crystal form. The material is prepared through a carbon thermal reduction method, specifically, silicon carbide nanowires grow on the surface of graphene in situ, so that electromagnetic parameters and impedance matching characteristics of the material are optimized. The prepared composite material has the characteristics of light weight, high specific surface area, good dielectric loss and the like, and shows good broadband wave-absorbing performance in the frequency band of 2-18 GHz, the minimum reflection loss can reach-23.535 dB, and the effective absorption bandwidth reaches 1.498 GHz. The method is simple in process, low in energy consumption and suitable for large-scale production, and has wide application prospects in the fields of stealth technology, electromagnetic shielding and the like.

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 preparation method of chromium-free fingerprint-resistant liquid for an aluminized zinc plate, and relates to the technical field of metal surface treatment materials.The preparation method comprises the steps that a benzotriazole-cerium molybdate composite corrosion inhibition system is constructed, and multiple layers of adsorption films are formed through intermolecular pi-pi accumulation and rare earth ion coordination; meanwhile, a graphene oxide / nano silicon dioxide synergistic enhancement system is introduced, graphene sheet layers are directionally arranged to form a physical barrier, and micropores are filled with nano particles to improve compactness; and meanwhile, a lanthanide rare earth compound is adopted for modifying the flash-rust inhibitor, the stability of a passivation film on the metal surface is enhanced through the empty orbital characteristic of rare earth elements, the nanometer material gradient dispersion technology is combined with the ultrasonic-mechanical coupling dispersion technology, filler uniform distribution and interface bonding strengthening are achieved, and the fingerprint resistance, corrosion resistance and the like of the film layer are effectively guaranteed.

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 relates to a molecular dynamics simulation method for constructing graphene fibers by graphene sheets, and belongs to the technical field of graphene material simulation. A simulation model of graphene fibers is constructed by graphene sheets, and a virtual molecular dynamics simulation test is adopted to replace a traditional experimental process, so that the defects of an experiment in time and space scales are overcome. According to the method, through molecular dynamics simulation, the arrangement, combination and curling behaviors of graphene sheets in the fiber are deeply disclosed, and a theoretical basis is provided for optimizing the microstructure and performance of the graphene fiber.

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.

According to the preparation method of the graphene heat conduction film or the graphene foam, in the preparation process of the graphene heat conduction film or the graphene foam, a porous graphene oxide film with a surface structure in a fluctuating shape is used as a substrate, graphene oxide slurry is used for immersing the substrate, and then the substrate is flatly coated and integrally dried, so that the graphene heat conduction film or the graphene foam is obtained. And then carrying out heat treatment to prepare the graphene heat-conducting film or graphene foam. The arrangement direction of graphene oxide sheets in the porous graphene oxide film is consistent with the direction of the fluctuating surface structure, and after heat treatment, the porous graphene oxide film has a good in-plane heat conductivity coefficient in the surface direction; graphene sheet layer arrangement orientation consistent with the surface direction of the fluctuating morphology of the porous graphene oxide film is reserved in the finally prepared graphene heat conduction film or graphene foam, and a good longitudinal heat conduction channel is provided for the graphene heat conduction film.

The invention is suitable for the technical field of lithium ion battery materials, and discloses a graphene-heteroatom doped porous carbon material, a lithium titanate amorphous carbon coated silicon carbon composite material, a preparation method thereof, a negative pole piece and a lithium ion battery. The graphene-heteroatom doped porous carbon material is prepared from porous carbon, graphene and heteroatoms, the graphene and the heteroatoms are distributed in the porous carbon, and in percentage by mass, the content of the graphene is 0.5 wt%-2wt%, the content of the heteroatoms is 0.5 wt%-2wt%, and the balance is the porous carbon. According to the graphene-heteroatom doped porous carbon material disclosed by the invention, the compaction density of porous carbon is improved by utilizing high electron conductivity of heteroatoms and high ductility of a graphene lamellar structure; in addition, a basic group on the surface of the heteroatom solution and an acidic group of the graphene oxide can generate a chemical bond linked carbon structure through a hydrothermal reaction, and the tap density and the electronic conductivity of the material are improved.

The invention provides a process for preparing a three-dimensional graphene foam metal composite material by a biological template method. The preparation method comprises the following steps: preparing through an innovative biological template method process, carrying out carbonization-activation treatment on a natural hierarchical porous biological structure serving as a sacrificial template to form a three-dimensional graphene foam skeleton with bionic hierarchical pore channels, and carrying out in-situ compounding of copper / silver metal nanoparticles through a pulse electrodeposition technology to obtain the composite material. And finally, the three-dimensional graphene foam metal composite material with ultrahigh thermal conductivity and eco-friendly characteristics is constructed. The core breakthrough of the heat-conducting property is as follows: a bionic heat transfer framework is optimized, graded pores derived from a biological template form a phonon efficient transfer path, and the axial heat conductivity is improved by more than 40% compared with that of a material prepared by a traditional chemical foaming method; according to graphene-metal interface cooperation, metal nanoparticles directionally grow on the edge of a graphene sheet layer and hole wall defect sites, and interface thermal resistance is reduced to 8.7 * 10 <-9 > m < 2 > K / W by forming a coherent interface; cross-scale heat flow guide control is achieved, specifically, phonon conduction with the in-plane heat conductivity being 1600 W / (m.K) is achieved through a high-crystallinity graphene domain in a micropore, and an electron conduction heat diffusion network is constructed through a metal filling layer in a macropore channel.

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 belongs to the technical field of graphene preparation, and particularly discloses a graphene preparation method and device based on coupling of an ultrasonic phased array and a micro-fluidic chip, and the preparation method comprises the following steps: graphite oxide dispersion liquid enters a micro-fluidic main channel through a sample inlet of the micro-fluidic chip; in a standing wave sound field and a laminar flow state of an ultrasonic phased array, stripping the graphite oxide dispersion liquid through a micro-jet shear force generated by a cavitation effect of the standing wave sound field to obtain a graphene oxide sheet layer; graphene oxide lamellas are synchronously separated to a specified separation flow channel through fluid shear force generated by a micro-channel contraction section and an inertia focusing effect caused by curvature of an arc-shaped separation section, and non-single-layer graphene oxide lamellas are separated to a flow channel. The proportion of the single-layer graphene obtained by the preparation method provided by the invention is as high as 95%, and the problem of microchannel blockage can be relieved.

The present invention discloses a thermal interface material with high compression and resilience and a preparation method thereof. High thermal conductivity fibers and elastic polymers are introduced between the graphene sheets arranged in an oriented manner. Under the action of pressure, the graphene sheets form a curved structure on the surface of the fibers. The elastic polymer firmly binds the graphene and the high thermal conductivity fibers and improves the compression and resilience ability. Physical crosslinking is formed between the curved graphene sheets through π-π conjugation, thereby constructing a material with both a thermal conduction skeleton and an elastic microstructure. Subsequently, it is cut along the direction perpendicular to the graphene sheets to obtain an interface material containing curved graphene sheets and high thermal conductivity fibers, so that the material has both high vertical thermal conductivity, high horizontal thermal conductivity and high compressibility.

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 invention relates to the use of graphene sheets for increasing the glass transition temperature of a material comprising at least one thermosetting resin as well as to a method for increasing the glass transition temperature of a material comprising at least one thermosetting resin.

The present invention relates to a positive electrode active material comprising a core and a coating layer disposed on the core, wherein the core comprises Li 1+ x M y O 2+z , wherein M is at least one element selected from the group consisting of nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe), phosphorus (P), aluminum (Al), magnesium (Mg), calcium (Ca), zirconium (Zr), zinc (Zn), titanium (Ti), ruthenium (Ru), niobium (Nb), tungsten (W), boron (B), silicon (Si), sodium (Na), potassium (K), molybdenum (Mo) and vanadium (V), ‑0.2≤x≤0.2, 0<y≤2, and 0≤z≤2, the coating comprises carbon-based particles, wherein the carbon-based particles include a structure in which a plurality of graphene sheets are interconnected, and the D / G peak ratio during Raman spectroscopy measurement is in the range of 0.9 to 1.3; a positive electrode comprising the positive electrode active material and a secondary battery comprising the positive electrode.

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.