10 results about "Graphite intercalation compound" patented technology

The invention belongs to the technical field of heat-conducting glue materials, and particularly relates to polyamide-based heat-conducting carbon glue and a preparation method thereof. The preparation method comprises the following steps: sequentially adding graphite, binary organic acid and an activating agent into molten caprolactam, uniformly mixing, heating to react for a period of time, continuously adding a chain extender, sodium hydroxide and a graphite intercalation compound, and uniformly stirring to obtain a mixed system; and after the temperature of the mixed system is stable, adding ethanol, and continuously stirring until the temperature of the mixed system is stable again to obtain the polyamide-based heat-conducting carbon adhesive. The polyamide-based heat-conducting carbon adhesive prepared by the invention is excellent in heat conductivity and high in chemical stability, and can be suitable for various use scenes.

The application discloses a method for preparing reduced graphene oxide by a gas-solid phase one-step method and belongs to the technical field of graphene preparation. The method comprises the following steps: step 1, a certain proportion of combustible gas and air is introduced into a combustion furnace to make the combustible gas and air have an incomplete combustion reaction, and high-temperature gas containing carbon monoxide and hydrogen is generated; step 2, the high-temperature gas of the combustion furnace is used for preparing graphene oxide powder and thermal reduction reaction of graphite intercalation compounds; and step 3, the reactants in step 2 are cooled, then gas-solid separation is carried out, and the obtained solid is graphene powder. The combustible gas is convenient and cheap, a high-temperature and reduction gas atmosphere is created, the graphite intercalation compound continuously completes the powder preparation and the reduction of graphene oxide in a closed environment, the production of the reduced graphene oxide has ideal production efficiency and product yield, and the production cost is relatively low.

The invention relates to the technical field of combustion synthesis, in particular to an expanded graphite and graphene compound as well as a preparation method and application thereof. The invention provides a preparation method of an expanded graphite and graphene compound, which comprises the following steps: mixing magnesium powder and calcium carbonate to obtain a mixture; the mass ratio of the magnesium powder to the carbonate is 1: (1-3); and mixing the mixture with a graphite intercalation compound, and carrying out a combustion synthesis reaction to obtain the expanded graphite and graphene compound. The expanded graphite and graphene compound prepared by the preparation method provided by the invention has a larger average pore size, and is more beneficial to rapid diffusion of adsorbate into the material.

The application discloses a metal-based graphite composite material and a preparation method thereof, and belongs to the field of metal-based graphite composite materials. The metal-based graphite composite material is prepared by mixing an intercalation compound of graphite, a catalyst and a metal reducing agent, carrying out a reduction reaction to obtain an intermediate product, and removing impurities from the intermediate product. The intercalation compound of graphite contains an intercalation agent, and the intercalation agent contains a metal compound. The intercalation compound of graphite is not prone to agglomeration, and the intercalation agent in the intercalation compound of graphite is uniformly distributed between graphite layers. In-situ reduction of the metal compound in the intercalation agent by the metal reducing agent can make the metal source in the metal-based graphite intercalation composite material more uniformly distributed. In addition, the catalyst, especially the sodium metal catalyst, can promote the insertion of the metal reducing agent at a relatively low temperature, and the metal reducing agent can also complete the reduction of the intercalation agent to obtain the metal source at a relatively low temperature, so that the metal particles are not excessively grown due to excessively high temperature.

The application discloses a method for rapidly preparing graphene, graphene powder and graphene aqueous slurry, and belongs to the field of inorganic nanomaterials. The method comprises the following steps: high-temperature treatment: high-temperature treatment is performed on graphite raw materials to obtain graphite materials with more uniform arrangement of carbon atoms; pretreatment: rapid pretreatment is performed on the graphite materials in a concentrated acid system to obtain graphite intercalation compounds; and rapid electrochemical exfoliation: the pretreated graphite materials are immersed into an electrolyte at a certain speed, electrolysis is performed until obvious graphite expansion bodies appear, auxiliary exfoliation is performed, and graphene powder is obtained. The graphite raw materials are subjected to high-temperature treatment, so that the originally randomly distributed carbon atoms are arranged in an orderly manner. In the concentrated acid system, graphite intercalation compounds (GICs) which do not damage the layered structure of graphite are formed between the graphene layers through electrochemical action, so that the subsequent electrochemical exfoliation speed is faster, the graphene layers are more uniform, and the quality of the graphene is higher.

To provide a method for producing a graphite intercalation compound, which does not require mechanical operation, does not require post-treatment such as removal of a catalyst depending on the kind of an alkali metal, is simple and high-speed, and enables mass synthesis.SOLUTION: According to one aspect of the present invention, there is provided a method of manufacturing an intercalation compound comprising a base material and an insertion material, the method comprising the steps of: introducing the base material and the insertion material into a container in the presence of an inert gas; heating the container to a temperature sufficient for the insertion material to become liquid in the presence of the inert gas; forming the intercalation compound by direct contact and reaction between the base material and the liquid; and continuing to heat the container for a time sufficient to complete the reaction.SELECTED DRAWING: Figure 1

The invention discloses an anionic polymerization self-foaming polyamide 6 and graphite intercalation compound composite material as well as a preparation method and application thereof, belongs to the field of novel materials, and designs a caprolactam anionic ring-opening polymerization system initiated by an initiation system consisting of an initiator (sodium caprolactam) and an activator (toluene diisocynate). The anionic polymerization nylon 6 composite material has a star-shaped net-shaped cross-linked chemical structure, a stable self-foaming characteristic and a sponge-like foam structure, has the characteristics of extremely low collapse rate, high polymerization rate, excellent mechanical property, high crystallinity and the like, and can be applied to the fields of electromagnetic shielding and the like.

The invention discloses a graphite high-temperature expansion furnace and a using method thereof, and relates to the technical field of graphite expansion, the graphite high-temperature expansion furnace comprises an expansion furnace, the top of the expansion furnace is fixedly connected with a feeding hopper, the inner wall of the feeding hopper is fixedly connected with a material distributing plate, the interior of the expansion furnace is rotatably connected with a containing hopper, and a material spreading assembly is arranged in the expansion furnace; a driving assembly is arranged on the outer surface of the spreading assembly, a swing assembly is arranged at the end of the expansion furnace, and a stripping assembly is arranged on the outer surface of the expansion furnace. Graphite is shunted, the risk of blockage in the feeding port is effectively reduced, graphite to be expanded is flatly laid on the containing hopper, graphite accumulation can be prevented, graphite is heated more uniformly in the heating process, graphite intercalation compounds can be decomposed uniformly at high temperature, uniform expansion of the graphite is achieved, and the expansion rate of the graphite is increased. And meanwhile, the heat transfer efficiency can be improved, and the heat can be more effectively transferred to each piece of graphite in the expansion process, so that the energy consumption is reduced, and the energy utilization efficiency is improved.

This invention discloses a multi-effect treatment method for graphite intercalation compounds, belonging to the field of graphene preparation technology. The method includes: washing, filtering, and lightly drying a wet-prepared graphite intercalation compound to obtain the graphite intercalation compound; adding the prepared graphite intercalation compound and ammonium carbamate in a certain proportion into a pulverizer to pulverize, mix, and disperse them evenly; introducing the prepared mixture into a reactor, introducing carbon dioxide into the reactor, and stirring the material to ensure a complete reaction, thereby obtaining ammonium bicarbonate-coated graphite intercalation compound powder. This invention pre-treats the washed graphite intercalation compound before the powdering and reduction reaction of graphene oxide, reducing the adverse effects of washing on the intercalation effect and improving the reduction capacity of the graphene oxide reduction process.

The application provides a kind of nano graphite and its preparation method, relate to the technical field of nano graphite.The nano graphite has the characteristics of high carbon content, few layer sheet structure and low metal impurity content.The preparation method comprises: graphite raw material is subjected to acid intercalation reaction to obtain graphite intercalation compound, and metal impurities are removed by electrochemical ion exchange purification, then few layer nano graphite dispersion liquid is obtained by ion exchange and ultrasonic stripping, and finally lattice defects are repaired by rapid heating graphitization annealing.The application realizes the deep removal of metal impurities and the efficient repair of lattice defects by combining the process of electrochemical ion exchange purification and rapid graphitization annealing, and effectively inhibits the sintering and growth of nano graphite sheets.