Process for preparing high-thermal-conductivity heat-conducting graphite flake based on back film processing method

Abstract

The invention discloses a process for preparing a high-thermal-conductivity heat-conducting graphite flake based on a back film processing method. The process comprises the following steps: 1) preparation of raw materials; 2) pre-crushing; 3) pre-screening; 4) iron removal; 5) secondary crushing; 6) secondary screening; 7) mixing; 8) compressing and heating; 9) high-temperature graphitization; 10) back film preparation; and 11) cutting. The process is scientific and reasonable in steps, improves conventional processing technology and carries out refinement on raw materials to allow the granularity of the raw materials to be more uniform and consistent, so the qualified rate of a finished graphite flake is improved; and thus, the conductivity and thermal conductivity of the heat-conducting graphite flake are improved. Through the process, the graphite flake has improved chemical stability and reduced thermal expansivity and is easy to process and mold.

Description

technical field [0001] The invention relates to a thermally conductive graphite sheet used in the field of electronic products, in particular to a process for preparing a high thermally conductive thermally conductive graphite sheet based on a back film processing method. Background technique [0002] Thermally conductive graphite sheet is a brand-new heat-conducting and heat-dissipating material. It conducts heat evenly along two sides, shields heat sources and components, and improves the performance of consumer electronics products. The color is generally black, and the material is finely processed natural graphite. The thermal conductivity is in the horizontal direction. Up to 1500W / M-K, using IC, CPU, MOS, LED, heat sink, LCD-TV, notebook computer, communication equipment, wireless switch, DVD, handheld device, etc. [0003] Thermally conductive graphite sheets are non-metallic materials, but have the same or even higher thermal conductivity and electrical conductivit...

AI Technical Summary

Problems solved by technology

[0003] Thermally conductive graphite sheets are non-metallic materials, but have the same or even higher thermal conductivity and electrical conductivity than metals, and their thermal conductivity and electrical conductivity are stronger than aluminum foil or copper foil, but thermally conductive graphite sheets are produced in the existing production process. The electrical conductivity and thermal conductivity are relatively optimal, mainly in the processing stage of raw materials. In the prior art, the processing of raw materials for thermally conductive graphite sheets is not refined enough, resulting in more impurities in the raw materials, so that the final produced thermally conductive graphite sheets The quality is not high enough, the pass rate is reduced, and it will affect its better arrival and thermal conductivity