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US 5,294,300 AGranted
Production method of expanded graphite sheet and expanded graphite sheet obtained thereby
AssigneeToyo Tanso Co., Ltd.
InventorToshiki Kusuyama
Life of this patent
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Abstract
An expanded graphite sheet of very large mechanical strength can be produced by compressing a graphite expanded to not less than 50 times as large as normal state in average to be 0.02 to 0.3 g/cm.sup.3 in bulk density, grounding the compressed graphite particles, preparing a slurry together with a fibrilated aramid pulp fiber, and applying a wet process to the slurry to be prepared into a paper.
Claims5
A method for producing an expanded graphite sheet for use as a gasket material, comprising the steps of:
- preliminarily expanding graphite particles to not less than 50 times their average normal size;
- compressing the graphite particles to obtain a bulk density between 0.02 g/cm.sup.3 and 0.3 g/cm.sup.3 ;
- grinding the compressed graphite particles to a size not greater than 50 mesh;
- suspending the ground graphite particles in water in the presence of a binder and a reinforcing fiber formed by fibrillating an aramid pulp fiber to have a specific surface area not less than 3.0 m.sup.2 /g to obtain a paper-making slurry;
- and
- wet-processing the slurry into a sheet,
- wherein the slurry consists of 60 to 95 parts by weight of the graphite particles, 3 to 25 parts by weight of the reinforcing fiber, and 1 to 20 parts by weight of the binder.
4 more elements
An expanded graphite sheet used as a gasket material, comprising:
- compressed and ground graphite particles obtained by compressing graphite particles preliminarily expanded to not less than 50 times their average normal size to obtain a bulk density between 0.02 g/cm.sup.3 and 0.3 g/cm.sup.3 and grinding said compressed graphite particles to a size not greater than 50 mesh;
- a reinforcing fiber formed by fibrillating an aramid pulp fiber to have a specific surface area not less than 3.0 m.sup.2 /g;
- a binder;
- and
- water,
- wherein said compressed and ground graphite particles, said reinforcing fiber, said binder and said water are suspended together in a slurry subject to a wet-process for preparation into a sheet, and wherein the slurry consists of 60 to 95 parts by weight of the graphite particles, 3 to 25 parts by weight of the reinforcing fiber and 1 to 20 parts by weight of the binder.
3 more elements
Dependencies are inferred from the claim text.