SEPARATOR MATERIAL FOR FUEL CELL AND PROCESS FOR PRODUCING THE SAME

摘要

A separator material for fuel cells which is homogeneous and reduced in thickness unevenness and which has a small thickness, with the thinnest-part thickness being 0.3 mm or smaller, and enables fuel cell miniaturization. It is characterized by being obtained by: superposing green sheets produced by the doctor blade method from a slurry obtained by dispersing a graphite powder in a resin solution comprising an organic solvent and, dissolved therein, a resin binder and a dispersant; and molding the superposed sheets by hot pressing. Also provided is a process for producing the separator material characterized by dispersing 100 parts by weight of a graphite powder in a resin solution comprising an organic solvent and, dissolved therein, 10-35 parts by weight of a resin binder and 0.1-10 parts by weight of a dispersant to prepare a slurry having a viscosity of 100-2,000 mPa·s, applying the slurry to a film by the doctor blade method, drying the slurry applied, subsequently stripping the resultant coating from the film to produce a green sheet, superposing layers of this green sheet, and molding the stack by hot pressing.