Patent ID: 8513348
Filing Date: 2013-08-20
Classification: B82Y,C01B,C01P,C08J,D01F,Y10T

Abstract:
1. A method of producing a carbon fiber composite material comprising: grinding untreated carbon nanofibers produced by a vapor growth method, the untreated carbon nanofibers being ground at a peripheral speed of 50 to 200 m/s for 0.5 to 60 minutes by a rotary grinder so that the ground carbon nanofibers have a tap density of 1.5 to 10 times higher than a tap density of the untreated carbon nanofibers, wherein the fiber lengths of the untreated carbon nanofibers are reduced to only a small extent in the grinding; mixing the carbon nanofibers into an elastomer, wherein specific portions of the elastomer are bonded to highly active sites of the carbon nanofibers through chemical interaction; and uniformly dispersing the carbon nanofibers in the elastomer by applying a shear force to obtain a carbon fiber composite material.