Electrically-conductive resin composition for porous fuel cell bipolar plate and method for the production thereof
The present invention provides an electrically-conductive resin composition for a porous fuel cell bipolar plate capable of forming a porous fuel cell bipolar plate having superior absorption of water produced (resulting in the reduction in a gas permeability) as well as limited elution of impurities (a high rate of electricity generating efficiency). An electrically-conductive resin composition for a porous fuel cell bipolar plate comprising an electrically-conductive material and a resin is provided, and the resin is a resin such as, a powdered resol-type phenolic resin having flow properties of from 5 to 100 mm at 125° C.
1. A porous fuel cell bipolar plate being obtained from an electrically-conductive resin composition comprising an electrically-conductive material and a resin comprising a solid ammonia resol-type phenolic resin having flow properties of from 5 to 100 mm at 125° C., and having a porosity of 10 to 30%.
2. The porous fuel cell bipolar plate according to claim 1 , wherein the resol-type phenolic resin is a powdered resol-type phenolic resin.
3. The porous fuel cell bipolar plate according to claim 1 , wherein the electrically-conductive material comprises two or more graphite-based materials having different, or varying average particle diameters.
4. The porous fuel cell bipolar plate according to claim 1 , wherein the resin consists of said resol-type phenolic resin.
5. The porous fuel cell bipolar plate according to claim 1 , wherein the flow properties are within a range of from 25 to 60 mm at 125° C.
6. A method for the production of a porous fuel cell bipolar plate having a porosity of 10 to 30% which comprises mixing an electrically-conductive material with a resin comprising a solid ammonia/resol-type phenolic resin having flow properties of from 5 to 100 mm at 125° C.
7. The method according to claim 6 , wherein both the electrically-conductive material and the phenolic resin are in the form of powder.
8. The method according to claim 6 , wherein the resin consists of said resol-type phenolic resin.
9. The method according to claim 6 , which comprises mixing the electrically-conductive material with the resin to obtain a mixture, then compounding the mixture to obtain a raw material having a grain size distribution of from 10 μm to 2.0 mm.