Preparation for carbon fiber paper used for gas diffusion layer of proton exchange membrane fuel cell
A technology of gas diffusion layer and proton exchange membrane, which is applied to fuel cell components, solid electrolyte fuel cells, fuel cells, etc., can solve the problems of carbon powder loss, energy consumption, low carbon powder utilization rate, etc., and achieve surface smoothness The effect of compact structure, good electrical conductivity and simple method
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[0039] Example 1
[0040] The pitch-based carbon fiber with a carbon content of 85-99% and a diameter of 10-20 μm is treated with water at 70°C to remove impurities; the PAN-based pre-oxidized fiber is activated with 3mol / L NaOH at a heating temperature of 40°C; The treated pitch-based carbon fiber is chopped, 3mm accounts for 50%, 6mm accounts for 50%, vegetable fiber is chopped 8mm accounts for 30%, 10mm accounts for 30%, and 12mm accounts for 40%; the activated PAN pre-oxidized yarn is chopped To 7mm;
[0041] Use anionic polyacrylamide as the dispersant to prepare a dispersant aqueous solution with a concentration of 0.2%; mix three kinds of chopped fibers into the dispersant aqueous solution in proportion to prepare a slurry, the three kinds of chopped fibers are mixed by weight, and pitch-based carbon fiber: PAN-based pre-oxidized fiber: plant fiber is 16:3:1, stir evenly to obtain papermaking slurry, the slurry concentration is 0.08%, add polymer binder polyvinyl alcohol to...
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[0044] Example 2
[0045] The pitch-based carbon fiber with a carbon content of 85-99% and a diameter of 10-20μm is treated with water at a water temperature of 60°C to remove impurities; the PAN-based pre-oxidized fiber is activated with 3mol / L KOH at a heating temperature of 50°C; Base carbon fiber is chopped, 3mm accounts for 50%, 6mm accounts for 50%, plant fiber is chopped 6mm accounts for 50%, and 11mm accounts for 50%; the activated PAN pre-oxidized yarn is chopped to 7mm;
[0046] Use anionic polyacrylamide as the dispersant to prepare a dispersant aqueous solution with a concentration of 0.5%; mix three kinds of chopped fibers into the dispersant aqueous solution in proportion to prepare a slurry. The three kinds of chopped fibers are mixed by weight. Pitch-based carbon fiber: PAN-based pre-oxidized fiber: plant fiber is 20:4:1. Stir uniformly to obtain papermaking slurry. The slurry concentration is 0.07%. Add the polymer binder carboxymethyl cellulose to the slurry and ...
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[0049] Example 3
[0050] The pitch-based carbon fiber with a carbon content of 85-99% and a diameter of 10-20 μm is treated with water at a temperature of 100°C to remove impurities; for PAN-based pre-oxidized fiber, 2mol / L H 3 PO 4 Activation; chopped pitch-based carbon fiber, 3mm accounted for 50%, 5mm accounted for 50%, plant fiber chopped 6mm accounted for 30%, 9mm accounted for 30%, 12mm accounted for 40%; chopped the activated PAN pre-oxidized yarn To 10mm;
[0051] Use polyethylene oxide as the dispersant to prepare a dispersant aqueous solution with a concentration of 0.1%; mix three kinds of chopped fibers into the dispersant aqueous solution in proportion to prepare a slurry, the three kinds of chopped fibers are mixed by weight, pitch-based carbon fiber: PAN The ratio of base pre-oxidized fiber: plant fiber is 19:4:2. Stir evenly to obtain paper-making slurry. The slurry concentration is 0.06%. Add the polymer binder polyvinyl alcohol to the slurry and stir it evenly. ...
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