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US 12,767,871 B2Granted
Method for manufacturing heat dissipation sheet using waste graphite
AssigneeNts Co., Ltd.
InventorGwang Su Kim
Life of this patent
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Abstract
According to the present invention, when manufacturing expandable graphite, it is possible to remarkably reduce the generation of waste acid and waste and economically manufacture expandable graphite having a low content of volatile substances and good appearance, and thus, it is possible to efficiently manufacture a heat dissipation sheet having excellent thermal conductivity.
Claims11
A method for manufacturing a heat dissipation sheet, comprising the steps of:
- (1) pulverizing a graphite material comprising waste graphite to produce a powder containing waste graphite;
- (2) subjecting the powder containing waste graphite to the heat treatment at 900° C. to 1100° C. for 3 to 5 hours to produce an expandable graphite;
- and
- (3) pressurizing the expandable graphite obtained after heat treatment to produce a sheet-,
- wherein the heat treatment step is performed in a facility for manufacturing expandable graphite comprising:
- a container in which graphite bricks and refractory bricks in a ratio of 5:5 to 8:2 are bonded with a bonding agent, the graphite bricks are disposed in the center part and/or the lower part of the container, and the outer wall of the container is surrounded by austenitic stainless steel;
- an airtight furnace for heating the container by electricity or liquefied petroleum gas;
- and
- a gas collecting and dust collecting facility disposed at an upper part of the airtight furnace to communicate with the inside of the airtight furnace.
6 more elements
Dependencies are inferred from the claim text.