A method for preparing multilayer self-supporting carbon film
A self-supporting, carbon-based membrane technology, used in carbon preparation/purification, layered products, etc., can solve the problems of narrow structure and composition adjustment range, complex preparation process, low production efficiency, etc., to improve the degree of graphitization, Simple process and low cost effect
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Embodiment 1
[0038] This implementation example includes the following steps:
[0039] (1) Weigh 2 g of polyacrylonitrile powder, add it into 10 ml of N,N-dimethylformamide, stir and dissolve at 80° C., and form a solution with a certain viscosity.
[0040] (2) Weigh 2 g of silicon powder and add it into the above solution, and stir magnetically at 80° C. for 12 hours.
[0041] (3) Spread the uniformly mixed solution on a glass plate with PE film on the surface by casting method, then spread a layer of PE film on the surface, and spread the solution on a 1 micron thick surface by casting method again. On top of the PE film, gently roll flat with a glass rod. By repeating the above process, multiple layers can be prepared, and then placed in a vacuum oven at 60°C for 12 hours.
[0042] (4) The PE cling film coated with carbon film was peeled off from the glass plate, then pre-oxidized in air at 260°C for 2 hours, and carbonized at 1100°C for 1 hour to obtain a multilayer self-supporting S...
Embodiment 2
[0044] This implementation example includes the following steps:
[0045] (1) 2 g of sucrose was dissolved in 2 g of 48.5% phenolic resin aqueous solution, and stirred at 60° C. for 30 minutes to obtain a precursor solution.
[0046] (2) adopt casting method to spread above-mentioned solution on the glass plate that the surface is covered with 20 micron thick PE film, then spread one layer of PE film on its surface again, solution is spread on the PE film again, with The glass rod is gently rolled flat. By repeating the above process, multiple layers can be prepared, and then placed in a vacuum oven at 100°C for 1 hour.
[0047] (3) The PE cling film coated with carbon film was peeled off from the glass plate, then pre-oxidized in air at 200°C for 4 hours, and carbonized at 1400°C for 1 hour to finally obtain a multilayer self-supporting carbon film.
Embodiment 3
[0049] This implementation example includes the following steps:
[0050] (1) Weigh 1 g of polyacrylonitrile powder, add it into 10 ml of N,N-dimethylformamide, stir and dissolve at 80° C., and form a solution with a certain viscosity.
[0051] (2) Weigh 1g of silicon powder / titanium dioxide composite material (Si@TiO 2 ) was added to the above solution, and magnetically stirred at 80° C. for 12 hours.
[0052] (3) Spread the above-mentioned solution on the glass plate with PE film on the surface by casting method, then spread a layer of 40 micron thick PP film on its surface, spread the solution on the PP film again, and use The glass rod is gently rolled flat. By repeating the above process, multiple layers can be prepared, and then placed in a vacuum oven at 80°C for 12 hours.
[0053] (4) The PP film coated with the carbon film was peeled off from the glass plate, then pre-oxidized in air at 300 °C for 1 hour, and carbonized at 1100 °C for 3 hours to finally obtain a mu...
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