Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing graphene all-carbon composite thermal interface material

A thermal interface material, graphene technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of difficulty in forming a heat dissipation film, high preparation cost, and the performance of graphene thermal interface film materials. Mass production, high cost, difficult to control effect

Active Publication Date: 2016-08-24
HARBIN ENG UNIV
View PDF5 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite paper is easy to process and shape, and its mechanical properties and other properties can meet the requirements for the preparation of heat dissipation films and electrothermal materials. However, it is difficult to prepare heat dissipation films from graphene powder, and it is often necessary to add binders to improve its strength and processability. , leading to a decline in the performance of the graphene thermal interface film material, and high preparation costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The worm graphite is pressed into loose and porous flexible graphite paper, the graphite paper size is 70mm*50mm*1mm, and the mass is 0.16g. Then weigh 50 g of absolute ethanol and 1.25 g of graphene, disperse the graphene in ethanol, shear emulsify for 5 min under the condition of 10000 r / min, and ultrasonicate for 120 min under the condition of 500 W power. Then the dispersion is moved into the sprayer, and the graphene dispersion is evenly sprayed on the surface of the graphite paper, and the composite material is vacuum-dried at 80° C. for 12 hours to obtain a composite film semi-finished product, which is called 0.18 g in quality. The film mass was 0.02 g. Finally, the semi-finished composite film obtained by drying is subjected to single-layer multi-stage rolling, and its thickness is rolled to 0.05mm, and finally a graphene full-carbon composite flexible film is obtained.

[0029] The flexible graphite paper without spraying graphene is multi-stage rolled to a t...

Embodiment 2

[0031] The worm graphite is pressed into loose and porous flexible graphite paper, the graphite paper size is 70mm*50mm*1mm, and the mass is 0.16g. Then weigh 50g of NMP (N-methylpyrrolidone), 1.25g of graphene, disperse the graphene in NMP (N-methylpyrrolidone), shear emulsify for 5min under the condition of 10000r / min, and ultrasonic for 120min under the condition of 500W power. Then the dispersion is moved into the sprayer, and the graphene dispersion is uniformly sprayed on the surface of the graphite paper, and the composite material is vacuum-dried at 80°C for 12 hours to obtain a composite film semi-finished product, which is called 0.185g in quality, and the surface graphene The film mass was 0.025 g. Finally, the semi-finished composite film obtained by drying is subjected to single-layer multi-stage rolling, and its thickness is rolled to 0.05mm, and finally a graphene full-carbon composite flexible film is obtained.

[0032] The flexible graphite paper without spra...

Embodiment 3

[0034] The worm graphite is pressed into loose and porous flexible graphite paper, the graphite paper size is 70mm*50mm*1mm, and the mass is 0.16g. Then weigh 50 g of absolute ethanol and 1.25 g of graphene, disperse the graphene in ethanol, shear emulsify for 5 min under the condition of 10000 r / min, and ultrasonicate for 120 min under the condition of 500 W power. Then get 2g of the dispersion and move it into the funnel to filter, obtain a layer of graphene film on the surface of the graphite paper, take out the graphite paper with the graphene film and carry out vacuum drying at 80°C for 12 hours to obtain a composite film semi-finished product, called Its mass is 0.192g, and the surface graphene film mass is 0.032g. Finally, the semi-finished composite film obtained by drying is subjected to single-layer multi-stage rolling, and its thickness is rolled to 0.05mm, and finally a graphene full-carbon composite flexible film is obtained.

[0035] The flexible graphite paper ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thermal conductivityaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing a graphene all-carbon composite thermal interface material. The method comprises the steps that worm graphite is pressed into loose and porous flexile graphite paper; graphene powder materials are dispersed into a solvent, and an evenly dispersed graphene dispersing solution is obtained through shearing, emulsifying and ultrasonic treatment; the micropores and surface of the graphite paper obtained in the first step are evenly filled with the graphene dispersing solution, and a composite is obtained; the composite is subjected to vacuum drying, the solvent is removed, and a semi-finished graphite paper-graphene composite film is obtained; the semi-finished composite film is subjected to multi-stage rolling, and finally a graphene all-carbon composite flexible film is obtained. The workability of the flexible graphite paper and the extremely high heat conducting performance of graphene are organically combined, the graphite paper is adopted as a matrix, graphene is adopted as a heat performance reinforcement, the method for preparing the graphene all-carbon composite thermal interface material is provided through a novel compounding process, and the all-carbon composite heat interface material is obtained.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a composite material of graphene and graphite paper. Background technique [0002] Flexible graphite paper is made of natural graphite or pyrolytic graphite, which is acidified and expanded and then rolled. In addition to the high temperature resistance and corrosion resistance of general graphite, it also has unique flexibility, good compressibility and resilience, and it also has good high and low temperature resistance, good thermal conductivity, electric heating performance and resistance corrosive. [0003] Graphene is a new material with a single-layer sheet structure composed of carbon atoms, which are connected to each other to form a hexagonal network. In 2004, physicists at the University of Manchester successfully separated graphene from graphite in experiments and won the 2010 Nobel Prize in Physics. Graphene has a special single...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 曹殿学张天宇程魁叶克耿家钰
Owner HARBIN ENG UNIV