Method for producing graphite sheet and polyimide film for graphite sheet

• Main Authors: KOBAYASHI MOTOAKI, MATSUTANI TERUO, INABA KEISUKE, OZAKI MASASHI
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; COMPOUNDS THEREOF; GENERAL PROCESSES OF COMPOUNDING; INORGANIC CHEMISTRY; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NON-METALLIC ELEMENTS; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The purpose of the present invention is to provide a graphite sheet having good thermal diffusivity and interlayer strength with high productivity. The purpose is achieved by a method for producing a graphite sheet, the method comprising a step for heat-treating a polyimide film to 2800 DEG C or higher, the polyimide film containing 0.01 wt% to 0.08 wt% of inorganic fine particles and a non-metallic additive containing 0.018 wt% to 0.032 wt% of phosphorus, the graphite sheet has a thermal diffusivity of 10.0 cm2/s or more. 本发明的目标是以较高生产性来提供热扩散率及层间强度良好的石墨片。通过一种石墨片的制造方法来达成所述目标，该制造方法包括将聚酰亚胺膜热处理至2800℃以上的工序，所述聚酰亚胺膜含有0.01重量％以上0.08重量％以下的无机微粒、以及含有0.018重量％以上0.032重量％以下的磷的非金属添加剂，所述石墨片的热扩散率为10.0cm2/s以上。