A kind of preparation method of carbon fiber paper
A carbon fiber paper and carbon fiber technology, which is applied in the direction of non-fiber pulp addition, fiber raw material treatment, synthetic cellulose/non-cellulose material pulp/paper, etc., can solve the problem of low strength, and achieve the effect of improving thermal conductivity and good mechanical properties
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Embodiment 1
[0017] Embodiment 1 (comparative example):
[0018] 1) Pretreat polyacrylonitrile-based carbon fibers with a length of 5 mm with aqueous sodium hydroxide solution, wash until neutral, add polyethylene oxide dispersion, and stir until the carbon fibers are evenly dispersed. Make a sheet, and dry at 90°C for 1 hour to obtain a carbon fiber primary paper;
[0019] 2) impregnate the carbon fiber primary paper product with 9wt% phenolic resin-ethanol solution for 1 hour; after impregnation, heat at 60°C for 1 hour; at 140°C, heat for 1 hour for pre-curing treatment; ℃ for 1 hour, 250 ℃ for 1 hour; finally carbonized at 900 ℃ for 1 hour to make carbon fiber paper; graphitized at 2500 ℃ for 1 hour to make carbon fiber graphite paper products.
[0020] Properties of the carbon fiber paper made:
[0021] The thickness is 0.19mm, the tensile strength is 29.7MPa, the surface resistivity is 6.92mΩ·cm, and the surface thermal conductivity is 16.8W / m·K.
Embodiment 2
[0023] 1) Mesophase pitch-based carbon fibers with a length of 5 mm were oxidized in air at 300°C for 2 hours; polyacrylonitrile-based carbon fibers with a length of 7 mm were pretreated with potassium hydroxide aqueous solution and washed until neutral;
[0024] 2) Mix the treated mesophase pitch-based carbon fiber and polyacrylonitrile-based carbon fiber at a mass ratio of 1:9, add it to the polyethylene oxide dispersion, and stir until the carbon fiber is evenly dispersed. Using wet papermaking technology, the paper sample is extracted The upper sheet is made and dried at 90°C for 40 minutes to obtain a carbon fiber primary paper product;
[0025] 3) Impregnate the carbon fiber primary paper product with 6wt% phenolic resin-ethanol solution for 1.5 hours; heat at 80°C for 0.5 hours after impregnation, and heat at 130°C for 1.5 hours for pre-curing treatment; then hot press at 180°C under 4MPa Curing for 0.5 hours, hot pressing at 240°C for 1 hour; finally carbonizing at 800...
Embodiment 3
[0029] 1) Inject concentrated nitric acid into the 7mm-long mesophase pitch-based carbon fiber, heat at 100°C, stir and reflux for 5 hours; pretreat the 3mm-long polyacrylonitrile-based carbon fiber with potassium hydroxide aqueous solution, and wash until neutral;
[0030] 2) Mix the treated mesophase pitch-based carbon fiber and polyacrylonitrile-based carbon fiber at a mass ratio of 2:8, add it to the polyethylene oxide dispersion, and stir until the carbon fiber is evenly dispersed. The upper sheet is made and dried at 85°C for 40 minutes to obtain a carbon fiber primary paper product;
[0031] 3) Impregnate the primary carbon fiber paper product with 10wt% phenolic resin-ethanol solution for 1 hour; heat at 80°C for 0.5 hours after impregnation, and heat at 140°C for 1.5 hours for pre-curing treatment; then hot press at 190°C under 6MPa Curing for 1 hour, hot pressing at 240°C for 1.5 hours; finally carbonizing at 1100°C for 1 hour to prepare carbon fiber paper; graphitiz...
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