Preparation method of artificial graphite film and graphite film material

Abstract

The invention discloses a preparation method of an artificial graphite film and a graphite film material. The method comprises: firstly subjecting a polyimide film to be fired according to a preset size to a first time of stepwise heating so that the polyimide film reacts, and cooling to obtain a semi-finished film; subjecting the semi-finished film to a second time of stepwise heating under inertgas protection so that the semi-finished film reacts, and cooling to obtain the graphite film. The polyimide film is adopted as a raw material. Two times of stepwise heating are performed, wherein aproper dynamic temperature filed is formed by utilizing the first time of stepwise heating to obtain a structure with high crystallinity, and on the basis of the first time of stepwise heating, the second time of stepwise heating is utilized and matches the first time of stepwise heating to form the graphite film with high orientation, high crystallinity and high conductivity, so that the preparedgraphite film has a higher thermal conductivity and improved thermal conduction performance.

Description

technical field [0001] The invention relates to the technical field of graphite film manufacture, in particular to a method for preparing an artificial graphite film and a graphite film material. Background technique [0002] With the continuous development of science and technology, various types of electronic terminals and auxiliary equipment, electronic components, such as electronic terminals such as notebook computers, tablet computers, smart phones, etc., and auxiliary equipment such as power banks. For electronic terminals, the functions of electronic terminals are becoming more and more powerful, the computing speed is getting faster and smaller, and the size is getting smaller and smaller, all of which lead to unavoidable heat dissipation problems; and the use of auxiliary equipment is becoming more and more frequent, and many household appliances The high integration and high density of electronic components in China will make the heat generation of electronic term...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many ways to prepare artificial graphite film. For example, polyimide film is used as raw material, and polyimide film and graphite paper are cross-laminated and then carbonized and graphitized in a carbonization furnace, which enhances the bending resistance of graphite film. performance and reduce the brittleness of graphite film, but the thermal conductivity of graphite film has not been significantly improved; another example is to use a composite film obtained by compounding nano-diamond and polyimide as a raw material, and cross-laminate with graphite paper for carbonization and Graphitization, to obtain a composite graphite film composed of nano-diamond and polyimide, which improves the degree of graphitization and carbonization yield, thereby improving the thermal conductivity of the composite graphite film to a certain extent, but its thermal conductivity is still not ideal , the highest thermal conductivity is only 1056W / (m·K), which needs to be further improved

Therefore, the graphite film produced by the existing preparation method generally has the problem of poor thermal conductivity, and the preparation process needs to be improved.

Images