Patent ID: 9211503
Filing Date: 2015-12-15
Classification: B01D,C02F

Abstract:
1. A preparation method of a perfluorinated polymer hollow fiber membrane, wherein the preparation method of the perfluorinated polymer hollow fiber membrane uses a membrane formation system, comprising: a perfluorinated polymer, polystyrene (PS), a polymer additive, a composite pore-forming agent, and an organic liquid; wherein, a scope of a mass percent of the perfluorinated polymer is 40 wt %-60 wt %, the scope of the mass percent of the PS is 2 wt %-10 wt %, the scope of the mass percent of the polymer additive is 10 wt %-20 wt %, the scope of the mass percent of the composite pore-forming agent is 10 wt %-30 wt %, and the scope of the mass percent of the organic liquid is 5 wt %-20 wt %; a sum of the mass percent of all composition mentioned above is 100%; the perfluorinated polymer is a copolymerization modification product that is formed by tetrafluoroethylene-based and perfluorinated second monomer, wherein the perfluorinated second monomer is hexafluoropropylene, perfluoroalkylvinyl ether, or ethylene; a molecular weight of the PS is 50,000˜200,000; the polymer additive is a polymer that contains perfluoroalkanes or a mixture of the polymer that contains perfluoroalkanes in any proportion; the composite pore-forming agent is a soluble pore-forming agent or an insoluble pore-forming agent; the soluble pore-forming agent is a water-soluble substance, and specifically is a water-soluble inorganic particle, a water-soluble polymer, or a mixture that is mixed by the water-soluble inorganic particle and the water-soluble polymer in any proportion; the water-soluble polymer is a water-soluble polymer, wherein a temperature of the water-soluble polymer that is processed with a decomposition is higher than the temperature of the water-soluble polymer that is processed with a spinning; the insoluble pore-forming agent is a non-water-soluble inorganic particle; the organic liquid is a diluent of the polymer additive with a high boiling point; a preparation method of a perfluorinated polymer hollow fiber membrane comprises steps of evenly mixing a perfluorinated polymer, PS, a polymer additive, and a composite pore-forming agent to obtain a first mixture; evenly mixing the first mixture and an organic liquid to obtain a second mixture; under 300° C.-350° C., processing the second mixture with a melt to spin by a twin-screw extruder; extruding a hollow fiber by a hollow fiber spinneret; dipping the hollow fiber membrane into deionized water for 48 hours; airing the hollow fiber membrane; putting the hollow fiber membrane into concentrated sulfuric acid to process with a sulfonation; washing the hollow fiber membrane with the deionized water; and drying the hollow fiber membrane; in such a manner that the hydrophilic perfluorinated polymer hollow fiber membrane is obtained; a method for processing the dried hollow fiber membrane sulfonation is described as follows; the concentrated sulfuric acid is a solvent and a sulfonating agent; a mass of the concentrated sulfuric acid is 5-10 times the mass of the hollow fiber membrane that is processed with the sulfonation; a temperature of the hollow fiber membrane that is processed with the sulfonation is 50° C.-80° C.; a time of the hollow fiber membrane that is processed with the sulfonation is 5-10 hours.