Preparation method of fluorine-containing branched sulfonated polyimide proton conducting membrane

Abstract

The invention discloses a preparation method of a fluorine-containing branched sulfonated polyimide proton conducting membrane. The preparation method is characterized by comprising the following steps: under protection of nitrogen gas, adding m-cresol, 1,4,5,8-naphthalene tetracarboxylic dianhydride and benzoic acid into a reactor, and stirring until solid substances are dissolved; adding m-cresol, 2,2'-disulfonic acid benzidine and triethylamine into a container, stirring until the solid substances are dissolved, then adding 1,3,5-tri(2-trifluoromethyl-4-aminophenoxy)benzene, 4,4'-diaminodiphenyl ether to stir to dissolve to obtain a mixture; putting the mixture in a constant-pressure dropping device, and dropwise adding the mixture into a reactor, stirring and heating for 15-24 hours at temperature of 40-100 DEG C; then casting a reacted material into a membrane, and drying the membrane; then soaking and washing to prepare the fluorine-containing branched sulfonated polyimide proton conducting membrane. The prepared fluorine-containing branched sulfonated polyimide proton conducting membrane is good in performance, and is suitable for the fields of all-vanadium redox flow cells, hydrogen oxygen fuel cells, direct methanol fuel cells and the like.

Description

technical field [0001] The invention belongs to the preparation of battery separators, and relates to a preparation method of a fluorine-containing branched sulfonated polyimide proton conductive membrane. The prepared fluorine-containing branched sulfonated polyimide proton conductive membrane is suitable for the fields of all-vanadium redox flow battery, hydrogen-oxygen fuel cell, direct methanol fuel cell and the like. Background technique [0002] With the rapid development of society and economy, people's demand for energy is increasing, and the shortage of traditional fossil energy has become an important problem that all countries in the world must face. my country will accelerate the development of renewable energy such as solar energy, tidal energy, and wind energy as a basic national policy. However, these new renewable energy sources will be affected by factors such as time, temperature, season, day and night, making the power generation process discontinuous and...

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Problems solved by technology

[0007] The present invention aims to overcome the shortcomings of the existing non-fluorine polymer SPI membranes, which have weak oxidation resistance and low vanadium resistance performance, and use fluorine-containing "Y" type triamine monomer as one of the raw materials to synthesize fluorine-containing branched sulfonate fluorine-containing branched sulfonated polyimide proton-conducting membrane, and the prepared fluorine-containing SPI proton-conducting membrane effectively makes up for the defect of high vanadium permeability of the branched membrane, and the fluorine-containing group The addition of vanadium ion effectively reduces the permeability of vanadium ions and improves the chemical stability, which makes the fluorine-containing branched SPI proton conductive membrane have a good application prospect in the field of VRFB

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