Patent ID: 7883650
Filing Date: 2011-02-08
Classification: H01B,H01M,Y02E,Y10S

Abstract:
1. A method for preparing a fuel cell composite bipolar plate, which comprises: a) compounding vinyl ester and graphite powder to form bulk molding compound (BMC) material, the graphite powder content ranging from 60 wt % to 95 wt % based on the total weight of the graphite powder and vinyl ester, wherein 0.05-10 wt % carbon nanotubes modified with polyether amine, based on the weight of the vinyl ester resin, is added during the compounding; b) molding the BMC material from step a) to form a bipolar plate having a desired shaped at 80-200° C. and 500-4000 psi, wherein said modified carbon nanotubes are prepared by a process comprising the following steps: A) conducting a ring-opening reaction between the polyether amine and a dicarboxylic acid anhydride containing an ethylenically unsaturated group, so that a polyamic acid is formed; B) adding carbon nanotubes and a free radical initiator to the resulting reaction mixture from step A), and conducting a grafting reaction so that the polyamic acid is linked to the carbon nanotubes, wherein the polyether amine added is in an amount of 1-300 wt % of the carbon nanotubes added, and the free radical initiator added is in an amount of 0.1-150 wt % of the carbon nanotubes added or 50-200 mole % of the polyether amine.