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Nano-carbon film based on nano-graphite sheet and preparation method thereof

A carbon nano-film, nano-graphite technology, applied in the directions of graphite, chemical instruments and methods, carbon compounds, etc., can solve the problems of high cost of carbon nano-film, complicated preparation process, poor gas barrier properties, etc., and achieve excellent gas barrier properties, preparation Simple process and easy to operate effect

Inactive Publication Date: 2014-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of high cost, complicated preparation process, poor electrical conductivity and poor gas barrier property of the carbon nano-film prepared by the existing carbon nano-film preparation method, and provides a carbon nano-film based on nano-graphite flakes Carbon nano film and preparation method thereof

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  • Nano-carbon film based on nano-graphite sheet and preparation method thereof
  • Nano-carbon film based on nano-graphite sheet and preparation method thereof
  • Nano-carbon film based on nano-graphite sheet and preparation method thereof

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specific Embodiment approach 1

[0020] Specific Embodiment 1: This embodiment provides a carbon nano-film based on nano-graphite flakes.

[0021] A carbon nanofilm based on nanographite flakes provided in this embodiment is further made into a carbon nanofilm by preparing nanographite flakes from natural graphite flakes, which is cheaper than ordinary carbon nanofilms; the preparation process is simple and easy to operate; Compared with ordinary carbon nano-films, carbon nano-films prepared from nano-graphite flakes have better uniformity; the approximate two-dimensional structure between graphite flakes in the prepared carbon nano-films overlaps each other to form a porous network structure, so that the carbon nano-films The resistivity reaches 0.8Ω·cm, and has good electrical conductivity. The helium leakage rate of the carbon nanofilm-reinforced composite material based on nano-graphite flakes prepared by the present invention reaches 10 -5 Pa cm 3 / S, has excellent gas barrier properties.

specific Embodiment approach 2

[0022] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the thickness of the thin film is 0.5 μm˜1.5 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific Embodiment Three: This embodiment provides a method for preparing a carbon nanofilm based on nano-graphite flakes, specifically as follows:

[0024] 1. Under the condition of 20℃~30℃, add natural flake graphite into the mixture of concentrated sulfuric acid and concentrated nitric acid Ⅰ, stir mechanically at a stirring rate of 300r / min~500r / min for 12h~20h, filter, and filter The final solid is washed with deionized water until the pH value is 6.5 to 7.5, and then dried to constant weight at a temperature of 90°C to 110°C and a vacuum condition of less than 0.1Pa to obtain dry graphite particles; wherein, concentrated sulfuric acid The mass percentage concentration is 95% to 98%, the mass percentage concentration of concentrated nitric acid is 65% to 68%, the volume ratio of concentrated sulfuric acid to concentrated nitric acid is (3.6 to 4.5): 1, the mixture of concentrated sulfuric acid and concentrated nitric acid I The ratio of volume to mass of natural f...

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Abstract

The invention provides a preparation method of the nano-carbon film based on a nano-graphite sheet, and relates to the field of the preparation method of the nano-carbon film, solving the technical problems that the prepared nano-carbon film prepared by the traditional nano-carbon film preparation method is high in cost and the preparation process is complex are solved. The nano-carbon film based on nano-graphite sheet is the film prepared by pressing the solid which is prepared by leaching nano-graphite sheet dispersion liquid with pH of 2 to 4. The preparation method comprises the steps as follows: 1, preparing expansion graphite; 2, preparing the graphite sheet dispersion liquid; and 3, preparing the nano-carbon film. The nano-carbon film based on nano-graphite sheet provided by the invention can be applied to the fields of aviation, aerospace and cars.

Description

technical field [0001] The invention relates to the field of preparation methods of carbon nanometer films. Background technique [0002] Nanographite flakes are a stable isotropic graphite nanomaterial. The electron distribution of a single carbon atom in graphite is 1S 2 2S 2 2P 2 . 2S, 2Px, and 2Py form three SPs at an angle of 120° to the graphite layer 2 hybridized orbitals, the overlap of these orbitals leads to σ bonding between carbon atoms in the layer, while 2Pz electrons form delocalized π orbitals, this delocalization makes the bonding between carbon atoms in the layer more stable, Therefore, its bonding strength is higher than that of a single C-C covalent bond. In addition, delocalization leads to weakening of the binding of π electrons, so π electrons can move freely within the layer, and the graphite interlayer is van der Waals force. Since the thickness of the nano-graphite flakes is 30-80 nm, the nano-graphite flakes have an approximate two-dimensiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02C01B31/04C01B32/21C01B32/225
Inventor 矫维成牛越王荣国刘文博杨帆郝立峰徐忠海万里赫晓东
Owner HARBIN INST OF TECH