High breathable polymer coated diaphragm as well as preparation method and application thereof

[0045] Add fatty alcohol polyoxyethylene ether to deionized water to prepare a wetting solution with a mass fraction of fatty alcohol polyoxyethylene ether of 3%.

[0046] Soak one side of the polyethylene porous membrane in the wetting solution for 3 minutes to obtain a wet polyethylene porous membrane.

[0047] Mix polyvinylidene fluoride, cellulose, polyvinylpyrrolidone, and nitrogen methyl formamide at a ratio of 1:1:0.54:7.7, stir at 60°C for 8 hours, and let stand for 12 hours to remove air bubbles to obtain a casting solution.

[0048] The casting liquid is coated on the wetted polyethylene porous membrane to obtain a wet membrane. The coating thickness of the wet film was 1 micron.

[0049] Soak the wet film in an aqueous solution with a mass fraction concentration of fatty acid polyoxyethylene ether of 8%, to obtain a primary film.

[0050] Soak the as-formed film in deionized water for 3 days, and dry it at 60°C to obtain a highly gas-permeable polymer-coated separato

[0054] Add fluoroalkyl methoxy ether alcohol to deionized water to prepare a wetting solution with a mass fraction of fluoroalkyl methoxy ether alcohol of 5%.

[0055] Soak one side of the polypropylene porous membrane in the wetting solution for 10 seconds to obtain a wet polypropylene porous membrane.

[0056] Mix polyacrylonitrile, lithium chloride, triethyl phosphate and dimethyl sulfoxide at a ratio of 1:0.025:2:2.75, stir at 50°C for 18 hours, and let stand for 12 hours to remove air bubbles to obtain a casting solution.

[0057] The casting solution was coated on the wet polypropylene porous membrane to obtain a wet membrane. The coating thickness of the wet film was 50 microns.

[0058] Soak the wet film in an aqueous solution with a mass fraction of 5% fluoroalkyl methoxy ether alcohol to obtain a primary film.

[0059] Soak the as-formed film in deionized water for 7 days, and dry it at 50°C to obtain a highly air-permeable polymer-coated separator.

[0060] The deco

[0063] Alkylphenol polyoxyethylene ether was added to deionized water to prepare a wetting solution with a mass fraction of alkylphenol polyoxyethylene ether of 1%.

[0064] Soak one side of the polyimide porous membrane in the wetting solution for 5 minutes to obtain a wet polyimide porous membrane.

[0065] Mix polymethylmethacrylate, polyvinylpyrrolidone, polyethylene glycol and dimethylacetamide at a ratio of 1:0.082:0.091:8.95, stir at 80°C for 3 hours, and let it stand for 12 hours to remove air bubbles to obtain a casting Membrane fluid.

[0066] Coating the casting solution on the wet polyimide porous membrane to obtain a wet membrane. The coating thickness of the wet film was 10 microns.

[0067] Soak the wet film in an aqueous solution with a mass fraction of fluoroalkyl ethoxy ether alcohol of 0.1% to obtain a primary film.

[0068] Soak the as-formed film in deionized water for 5 days, and dry it at 80°C to obtain a highly air-permeable polymer-coated separator.