Membrane formulation of fluorinated copolymer porous membrance and preparing method thereof
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United States of America Patent
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Mar 17, 2016
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Nov 24, 2015
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Jan 12, 2015
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Abstract
A membrane formulation of fluorinated copolymer porous membrane includes: 15-50 wt % ethylene-chlorotrifluoroethylene copolymer, 30-85 wt % diluent and 0-20 wt % composite pore-forming agent, totally 100 wt %; wherein the diluent is selected from a group consisting of di-isooctyladinpate, di-isooctyladinpate with dibutyl phthalate, diethyl phthalate and dioctyl phthalate with any proportion. Methods for preparing a fluorinated copolymer porous flat membrane and a fluorinated copolymer hollow fiber porous membrane with the above formulation are also provided. With the formulation, a membrane-forming temperature is reduced to below 200° C., and processes thereof are convenient. Furthermore, membrane mechanical property is excellent, porosity is high, permeability is sufficient, and the method is suitable for membrane separation under severe conditions such as acid-base mediums and organic solvents.
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