A porous carbon fiber paper for fuel cell with proton exchange membrane and preparation method thereof
A technology of porous carbon fiber and proton exchange membrane, which is applied in synthetic cellulose/non-cellulose material pulp/paper, special paper, fiber raw material processing, etc., can solve the complex process, low air permeability and uneven distribution of carbon fiber paper pores The problem is to overcome the uneven distribution of pores, high air permeability and uniform distribution of pores.
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Embodiment 1
[0022] Example 1: 20 parts of selected polyacrylonitrile-based carbon fibers with a diameter of 6 μm and an average fiber length of 10 mm were added to a 0.2% carboxymethyl cellulose aqueous solution, and dispersed by a high-speed mixer. Take another 80 parts of polyacrylonitrile fibers with a diameter of 8 μm and an average fiber length of 10 mm, put them into water to stir and disperse them, pour them into the chopped carbon fiber slurry, add 40 parts of 5% polyvinyl alcohol solution and mix them evenly, and use the wet papermaking process The paper was made and dried with hot air at 80° C., and then hot-pressed at 220° C. and 0.6 MPa for 1.5 minutes with a hot press to obtain an intermediate product.
[0023] Carbonize the above-mentioned intermediate product under the protection of argon at 1500° C. for 2 hours to prepare porous carbon fiber paper. The paper has a thickness of 0.25mm and a density of 0.37g / cm 3 Area weight: 92.5g / m 2 , air permeability 298L / m 2 ·s, resi...
example 2
[0024] Example 2: 42 parts of selected pitch-based carbon fibers with a diameter of 7 μm and an average fiber length of 4 mm were added to a 0.5% aqueous solution of methyl cellulose, and dispersed by a high-speed mixer. Take another 58 parts of polyimide fibers with a diameter of 10 μm and an average fiber length of 4 mm, put them into water, stir and disperse them, pour them into the chopped carbon fiber slurry, add 50 parts of 5% polyvinyl alcohol solution and mix them evenly, and make paper by wet method The paper is made and dried with hot air at 90° C., and hot pressed at 250° C. under a pressure of 1.0 MPa for 1.0 minute with a hot press to obtain an intermediate product.
[0025] The above-mentioned intermediate product was carbonized for 1.3 hours under the protection of argon at 2000° C. to prepare porous carbon fiber paper. The paper has a thickness of 0.19mm and a density of 0.42g / cm 3 Area weight: 79.8g / m 2 , air permeability 309L / m 2 ·s, resistivity 0.016Ω·cm....
example 3
[0026] Example 3: 39 parts of selected viscose-based carbon fibers with a diameter of 12 μm and an average fiber length of 6 mm were added to a 0.8% aqueous solution of hydroxyethyl cellulose sodium, and dispersed by a high-speed mixer. Take another 61 parts of pitch fibers with a diameter of 15 μm and an average fiber length of 6 mm, put them into water to stir and disperse them, pour them into the chopped carbon fiber slurry, add 15 parts of polyvinyl alcohol short fibers, mix them evenly, and use the wet papermaking process to make paper and use Dry it with hot air at 95° C., and heat press it at 260° C. under a pressure of 1.0 MPa for 1.0 minute with a hot press to obtain an intermediate product.
[0027] The above intermediate product was carbonized under argon protection at 2200°C for 1 hour to prepare porous carbon fiber paper. The paper has a thickness of 0.20mm and a density of 0.42g / cm 3 Area weight: 84.0g / m 2 , air permeability 339L / m 2 ·s, resistivity 0.019Ω·cm....
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