Kevlar nano fiber porous membrane, and preparation method and application thereof
A nanofiber and porous membrane technology, applied in the field of fiber membranes, can solve the problems of reducing the strength of para-aramid fibers, and achieve the effects of high strength, good high temperature resistance and short process.
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[0045] Example 1: Preparation of Kevlar nanofiber porous membrane with high strength, high temperature resistance and solvent resistance
[0046] (1) Add 16 parts by weight of Kevlar fiber (provided by Dupont), 16 parts by weight of potassium hydroxide, and 200 parts by weight of dimethyl sulfoxide into a round bottom flask. Stir at 25°C for 10 days to form uniform, transparent black-red Kevlar nanofibers. Methyl sulfoxide solution.
[0047] (2) Put 1 part by weight of PEG-200 into the Kevlar solution prepared in (1), and stir for 2-10 hours to form a uniform casting solution. The casting liquid was vacuum degassed for 2h for later use.
[0048] (3) Scrape a 100um thick film on a clean glass plate with a scraper, and evaporate the solvent at 50°C for 5 minutes, then sink into distilled water to form a gel. The gel film is soaked in distilled water for 8-24 hours until the solvent is completely removed, and then placed in a vacuum oven for 2 hours at 40°C and 2 hours at 180°C to for...
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[0051] Example 2: Preparation of Kevlar nanofiber porous membrane with high strength, high temperature resistance and solvent resistance
[0052] (1) Add 15 parts by weight of Kevlar, 15 parts by weight of potassium hydride, and 200 parts by weight of N,N-dimethylformamide (DMAC) into a round bottom flask, stir at 50°C for 2 days to form a uniform, transparent black-red Kevlar nanofiber DMAC Solution.
[0053] (2) Put 5 parts by weight of PVP-15 into the Kevlar solution prepared in (1), and stir for 2-12 hours to form a uniform casting solution. The casting liquid is vacuum degassed for 2~4h for later use.
[0054] (3) Scrape the film casting liquid on a clean glass plate with a scraper to make a 120um thick film, evaporate the solvent at 70°C for 4 minutes, and sink into distilled water to form a gel. The gel film is soaked in distilled water for 8-24 hours until the solvent is completely removed, and then placed in a vacuum oven at 60°C for 2 hours and 180°C for 2 hours to form a...
Example Embodiment
[0057] Example 3: Preparation of Kevlar nanofiber porous membrane with high strength, high temperature resistance and solvent resistance
[0058] (1) Add 16 parts by weight of Kevlar, 8 parts by weight of sodium hydride, and 200 parts by weight of N,N-dimethylacetamide (DMF) into a round bottom flask, stir at 40°C for 4 days to form uniform, transparent black-red Kevlar nanofiber DMF Solution.
[0059] (2) Put 7 parts by weight of PEG-2000 into the Kevlar solution prepared in (1), and stir for 2-10 hours to form a uniform casting solution. The casting liquid is vacuum degassed for 2~4h for later use.
[0060] (3) Scrape a 100um thick film on a clean glass plate with a spatula, evaporate the solvent at 80°C for 3 minutes, and sink into a solution with a volume ratio of distilled water / ethanol of 50 / 50 to form a gel. The gel film is soaked in distilled water for 8-24 hours until the solvent is completely removed, and then placed in a vacuum oven at 60°C for 2 hours and 150°C for 4 ho...
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