Method for the production of conductive composite material
First Claim
1. A method for the production of an electrical conductive intermediate product comprising electrical conductive solids, and a non conductive polymer binder wherein the intermediate material is produced by means of a continuous pressing machine
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Abstract
The invention is related to a method for the production of sheet like material that can be used in applications where polymer based material has to conduct electric current at low impedance, especially for application in electrodes, like the electrodes of polymer electrolyte membrane (PEM) fuel cells, the sheet material being electrically conductive composite material comprising a non conductive polymer binder and electrically conductive compounds. The method according to this invention has as its objective to provide a method for large-scale production of electrical conductive sheet like material in which the disadvantages of the prior art are avoided.
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14 Claims
- 1. A method for the production of an electrical conductive intermediate product comprising electrical conductive solids, and a non conductive polymer binder wherein the intermediate material is produced by means of a continuous pressing machine
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14. A method of forming shaped parts wherein the process comprises the following steps;
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Cutting the intermediate product to the right size, weight or volume to prepare a pre-form Heating of the preform to a temperature above Tm if semi crystalline polymer is used or above Tg if amorphous polymer is used. Placing the heated perform in a suitable mold in a suitable pressing machine like a hydraulic press, the mold having a temperature below Tg or Tm of the polymer and preferably avoiding direct contact between the mold surface and the heated preform prior to closing of the mold. Closing of the mold at high pressure to form the perform to a negative of the mold halves Release from the mold.
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Specification