Graphite foam and preparation method thereof

A technology of graphite foam and graphite nanosheets, which is applied in the field of materials, can solve problems such as complex processes, and achieve the effects of uniform pore distribution, low resistance, and simple methods

Active Publication Date: 2017-05-17
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When preparing graphite foam, the existing method is relatively complicated

Method used

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  • Graphite foam and preparation method thereof
  • Graphite foam and preparation method thereof
  • Graphite foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. S101, configure graphite nanosheet paste: disperse 22g of expanded graphite in 2kg of water and ethanol mixture, the mass ratio of water and ethanol is 1:9, add 1g of carboxymethylcellulose, and stir for 0.5 hours , and ultrasonically exfoliate the mixed solution for 10 hours with an ultrasonic pulverizer to obtain a dispersion of graphite nanosheets. The graphite nanosheet dispersion was suction filtered to obtain a mud-like graphite nanosheet paste, wherein the graphite nanosheet accounted for 4% by mass of the graphite nanosheet paste.

[0052] 2. S102, preparing graphite nanosheet mixture: dissolving 0.4g polyethylene glycol in 199.6g water, then adding to 200g graphite nanosheet paste obtained in step S101, stirring evenly to obtain graphite nanosheet mixture.

[0053] 3. S103, mold forming: the graphite nanosheet mixture obtained in step S102 is placed in molds of various shapes to form a certain shape, and then the graphite nanosheet mixture is taken out from ...

Embodiment 2

[0057] 1. S101, configure graphite nanosheet paste: disperse 60g of graphite nanosheets in a mixture of 2 kg of water and ethanol, the mass ratio of water and ethanol is 9:1, add 0.21g of polyvinylpyrrolidone, stir for 30 hours, a dispersion of graphite nanosheets was obtained. The nanosheet dispersion was suction-filtered to obtain a mud-like graphite nanosheet paste, wherein the mass percentage of graphite nanosheets in the graphite nanosheet paste was 12%.

[0058] 2. S102, preparing the graphite nanosheet mixture: add 200 g of the aqueous polyurethane solution to the 200 g of the graphite nanosheet paste obtained in step S101, and stir evenly to obtain the graphite nanosheet mixture. The mass content of polyurethane in the aqueous polyurethane solution is 24%.

[0059] 3. S103, mold forming: the graphite nanosheet mixture obtained in step S102 is placed in a mold to form a certain shape, and then the graphite nanosheet mixture is taken out from the mold.

[0060] 4. S104...

Embodiment 3

[0063] 1. S101, configure graphite nanosheet paste: disperse 32g graphite nanosheets in 3 kg of water and ethanol mixture, the mass ratio of water and ethanol is 1:1, and add 1.5g hydroxypropyl methylcellulose element, stirred for 20 hours to obtain a dispersion of graphite nanosheets. The nanosheet dispersion was suction-filtered to obtain a mud-like graphite nanosheet paste, wherein the mass percentage of graphite nanosheets in the graphite nanosheet paste was 9%.

[0064] 2. S102, preparing the graphite nanosheet mixture: add 100 g of the water-based phenolic resin solution to the 200 g of the graphite nanosheet paste obtained in step S101, and stir evenly to obtain the graphite nanosheet mixture. The mass content of the phenolic resin in the aqueous phenolic resin solution is 10%.

[0065] 3. S103, mold forming: the graphite nanosheet mixture obtained in step S102 is placed in a mold to form a certain shape, and then the graphite nanosheet mixture is taken out from the mo...

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Abstract

The invention provides a preparation method of graphite foam. The method comprises the following steps that graphite nanosheets are used as raw materials; a small number of macromolecular bonding agents are added; through template forming, the graphite foam is formed after the drying. The preparation method provided by the invention is simple and convenient, and can be used for forming graphite foam in various shapes; in addition, the prepared graphite foam has the controllable density and uniform pores. The prepared graphite foam also has the advantages of high pressure-resistant intensity, low resistance, oil absorbability, high heat conductivity and the like, can be widely applied to the fields of heat radiators, heat conduction pads, electromagnetic shielding materials and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to the field of materials, in particular to a graphite foam and a preparation method thereof. Background technique [0002] With the development of science and technology, many single-performance materials have been difficult to meet the needs of modern society, and various multi-functional materials are urgently needed. Carbon materials have always been a research hotspot, from fullerenes to carbon nanotubes, from graphite foam to graphene. Graphite foam occupies an important position in the family of carbon materials. [0003] Graphite foam is a low-density graphite material with a three-dimensional network structure composed of cells and graphite. The graphene foam developed in recent years can also be classified as graphite foam in terms of structure. It has a large specific surface area and good Electrical and thermal conductivity. Because graphite foam has a porous structure, it also has certain sound-absorbing and oil-ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B38/00C04B26/10C04B26/16C04B26/12C04B26/28C04B26/06C04B26/04C04B26/14B28B3/26
Inventor 王华涛张文英王春雨钟博程瑾宁周薇薇覃春林
Owner HARBIN INST OF TECH AT WEIHAI
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