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KR-20260062525-A - SYSTEM FOR MANUFACTURING GRAPHENE AND METHOD FOR MANUFACTURING GRAPHENE USING THE SAME

KR20260062525AKR 20260062525 AKR20260062525 AKR 20260062525AKR-20260062525-A

Abstract

A graphene manufacturing system is disclosed. It comprises: a carbon source grinding unit for producing carbon source particles by grinding an insulating carbon source material; a carbon-based conductor coating unit for producing a composite carbon source by applying a microwave having a frequency of 300 MHz to 3,000 GHz to a mixture of the carbon source particles and a carbon-based conductor powder to selectively heat the carbon-based conductor powder and thermally fusing the heated carbon-based conductor powder onto the surface of the carbon source particles; and a reaction unit for producing graphene from the composite carbon source by applying an electric current to the composite carbon source and performing Joule heating.

Inventors

  • 조철호

Assignees

  • (주)스피너스

Dates

Publication Date
20260507
Application Date
20241029

Claims (16)

  1. A carbon source grinding unit that grinds an insulating carbon source material to produce carbon source particles; A carbon-based conductor coating unit that manufactures a composite carbon source by applying a microwave having a frequency of 300 MHz to 3,000 GHz to a mixture of the carbon raw material particles and carbon-based conductor powder to selectively heat the carbon-based conductor powder and thermally fusing the heated carbon-based conductor powder onto the surface of the carbon raw material particles; A graphene manufacturing system comprising: a reaction unit that generates graphene from the composite carbon source by applying an electric current to the composite carbon source and performing Joule heating.
  2. In paragraph 1, The above reaction unit is, A graphene manufacturing system that produces an intermediate reactant by applying an alternating current to the above-mentioned composite carbon source to perform primary Joule heating, and then produces the graphene by applying a direct current to the intermediate reactant to perform secondary Joule heating.
  3. In paragraph 2, The above reaction unit is, A reaction chamber for receiving the above-mentioned composite carbon source or the above-mentioned intermediate reactant; One or more pairs of electrodes disposed inside the reaction chamber; A spacing adjustment device for adjusting the spacing between the above electrode pairs; A pressurizing device for pressurizing the interior of the reaction chamber; and A graphene manufacturing system comprising a power supply that applies the alternating current and the direct current to one or more electrode pairs.
  4. In paragraph 3, During the above first Joule heating, the power supply applies an alternating voltage of 10 to 380 V to the electrode pair, and A graphene manufacturing system in which, during the second Joule heating, the power supply applies a DC voltage of 10 to 380 V to the electrode pair.
  5. In paragraph 4, A graphene manufacturing system in which the power supply unit applies the alternating voltage such that the volume resistivity of the intermediate reactant is 1 to 100 Ω·cm.
  6. In paragraph 3, A graphene manufacturing system in which the pressurizing device pressurizes the inside of the reaction chamber so that a pressure of 0.25 kgf/㎠ to 25 kgf/㎠ is applied to the composite carbon source or the intermediate reactant contained inside the reactor.
  7. In paragraph 6, The above gap adjustment device is, Prior to the first Joule heating, the spacing between the electrode pairs is adjusted so that the resistance of the composite carbon source disposed between the electrode pairs is 100 to 500 Ω, and A graphene manufacturing system that adjusts the spacing between electrode pairs so that, prior to the second Joule heating, the resistance of the intermediate reactant disposed between the electrode pairs is 1 to 100 Ω.
  8. In Paragraph 7, A graphene manufacturing system in which the above-described spacing adjustment device adjusts the spacing between the electrode pairs within a range of 5 to 100 mm.
  9. In paragraph 1, A graphene manufacturing system comprising one or more selected from the group consisting of waste plastics, waste synthetic resins, used food packaging materials, cosmetic packaging materials, waste wood, food waste, waste clothing, waste medical waste, packaging materials contaminated with food or seasonings, waste paints, waste thermosetting resins, waste foam materials, and waste tires.
  10. In Paragraph 9, A graphene manufacturing system in which the carbon source grinding unit grinds the carbon source material to a size of 0.05 to 3 mm to produce the carbon source particles.
  11. In Paragraph 9, A graphene manufacturing system comprising one or more selected from the group consisting of carbon black, carbon fiber powder and short fibers, graphite powder, graphene, graphene oxide, carbon nanotubes, fullerene, and expanded graphite.
  12. In Paragraph 11, A graphene manufacturing system comprising the above composite carbon source containing 0.5 to 10 weight percent of the carbon-based conductor.
  13. In Paragraph 12, A graphene manufacturing system in which the volume resistivity of the above-mentioned composite carbon source is 1 to 1000 Ω·cm.
  14. In paragraph 1, In the above carbon-based conductive coating portion, A graphene manufacturing system in which microwaves of 300W to 30kW are irradiated onto carbon raw material particles and carbon-based conductive powder to selectively heat the carbon-based conductive powder.
  15. A first step of manufacturing carbon source particles by crushing an insulating carbon source material; A second step of manufacturing a composite carbon source by mixing the crushed carbon source particles and carbon-based conductor powder, applying microwaves having a frequency of 300 MHz to 3,000 GHz to selectively heat the carbon-based conductor powder, and thermally fusing the heated carbon-based conductor powder onto the surface of the carbon source particles; and A method for manufacturing graphene, comprising: a third step of introducing the composite carbon source into a reactor and heating the composite carbon source to produce graphene.
  16. In paragraph 15, The above third step is, A step of generating an intermediate reactant by applying an alternating current to the above-mentioned composite carbon source to perform primary Joule heating; and A method for manufacturing graphene, comprising the step of producing the graphene by applying a direct current to the intermediate product and performing secondary Joule heating.

Description

System for manufacturing graphene and method for manufacturing graphene using the same The present invention relates to a graphene manufacturing system and a method for manufacturing graphene using the same. Types of carbon materials include activated carbon, coke, carbon black, carbon fiber, carbon nanotube, fullerene, and graphene, depending on their structure or shape. In particular, graphene is a two-dimensional planar carbon allotrope with a honeycomb structure formed by sp2 bonds of carbon atoms. Of the four outermost electrons in a carbon atom, three electrons form δ bonds to create a hexagonal structure, and due to the long range of π-conjugated structure formed by the remaining electron, graphene possesses excellent physical, electrical, and thermal transfer properties. Methods for manufacturing graphene can be divided into top-down and bottom-up approaches. The top-down approach is further divided into physical and chemical methods. The physical method involves exfoliating graphite into graphene using tape or shear stress; while this yields high-quality graphene, it is difficult to produce on a large scale or in large quantities. The chemical method involves producing graphite oxide using strong acids and oxidizing agents, exfoliating it to obtain graphene oxide, and then treating it with heat or chemicals to obtain reduced graphene. Although the chemical exfoliation method was evaluated as the most advantageous for mass production of graphene, the oxidation of graphite using strong acids causes structural defects and generates oxygen functional groups, making it difficult for graphene to exhibit its inherent properties. To address this, reduction processes such as thermal or catalytic chemical reduction are added; however, the removal of structural defects and oxygen functional groups remains difficult, resulting in lower quality, and the method has the disadvantage of requiring multiple processing steps. The bottom-up method is a technique for synthesizing graphene using hydrocarbons with a low carbon number. Chemical Vapor Deposition (CVD) and Epitaxial Growth are examples. In CVD, metals that readily adsorb carbon, such as nickel, copper, and platinum, are deposited onto a silicon dioxide substrate in a catalyst layer. Then, carbon from hydrocarbons is deposited onto the catalyst layer under high-temperature conditions of approximately 1,000°C in a mixed gas atmosphere containing methane and hydrogen, followed by cooling to produce graphene. While this method can yield high-quality graphene, it faces challenges such as difficulty in mass production and high manufacturing costs. Epitaxial Growth produces graphene by heat-treating a material in which carbon adsorbed onto the crystal structure of a silicon carbide substrate at a high temperature of approximately 1,500°C; this causes the silicon to evaporate and the carbon to form graphene along the crystal surface. However, this process is difficult to mass-produce due to the high cost of materials and the complexity of the procedure. In terms of graphene quality, single-layer graphene is of higher quality and more expensive; typically, graphene is generally referred to as graphene if it has 10 layers or fewer. It is difficult to manufacture single-layer graphene using physical methods; although it can be produced using chemical vapor deposition or epitaxial growth methods, the manufacturing cost is high and mass production is difficult. If a graphene manufacturing technology is developed that is easy to mass-produce, inexpensive to manufacture, and universally applicable, it would have a significant ripple effect as it could be used in various fields; however, such technology has not yet been developed. FIG. 1 is a schematic diagram of a graphene manufacturing system according to one embodiment of the present invention. FIG. 2 is a structural diagram of the reaction section of a graphene manufacturing system according to one embodiment of the present invention. FIG. 3 is a structural diagram of the reaction section of a graphene manufacturing system according to another embodiment of the present invention. FIG. 4 is a structural diagram of the reaction section of a graphene manufacturing system according to another embodiment of the present invention. FIG. 5 is a structural diagram of the reaction section of a graphene manufacturing system according to another embodiment of the present invention. FIG. 6 is a structural diagram of a device for measuring the volume resistivity of a composite carbon source according to one embodiment of the present invention. FIG. 7 is a circuit diagram of a power supply and a resistance meter according to one embodiment of the present invention. FIG. 8 is a flowchart illustrating a method for manufacturing graphene according to one embodiment of the present invention. Figure 9 is the Raman spectrum of graphene according to an embodiment and a comparative example of the present invention. Hereinafter, embodiments o