Fluorine-containing network structure ion exchange membrane based on fluoroethyl vinyl ether polyalcohol and preparation method thereof
A fluoroethyl vinyl ether and ion exchange membrane technology, which is applied in the field of ion exchange membranes, can solve the problems of difficult control of the composite process of membrane materials, difficulty in large-scale batch production, environmental pollution of sulfonating agents, etc., so as to reduce membrane protons. The effect of exchange resistance, strong electrochemical corrosion resistance, and simple film production method
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Embodiment 1
[0044] With 120g dry sulfonic acid resin (number average molecular weight 80,000, exchange capacity 1.27mmol / g, H + type) was dissolved in 880g N,N-dimethylformamide (DMF) under anhydrous conditions to obtain a sulfonic acid solution (casting solution), and anhydrous toluene-2,4-diisocyanate 4.5g, fluoroethyl Vinyl ether polyol (FEVE, such as structural formula 3, X is Cl, R 1 is ethyl, R 2 is propyl, R 3 for CH 2 CH 2 CH 2 , R 4 for CH 2 ) 4.0g (the ratio of the number of hydroxyl groups -OH to the number of cyanate groups -NCO is 1:1), after fully dissolving and stirring evenly, drool on a smooth and horizontal glass surface under anhydrous conditions, at 55°C After evaporating the solvent for 1 hour, the temperature was raised to 160° C. to form a film, which was peeled off from the glass to obtain an ion-exchange membrane, and treated with 5% sulfuric acid to obtain an ion-exchange membrane with an interpenetrating network structure with a film thickness of 50 micro...
Embodiment 2
[0046] With 45g dry sulfonic acid resin (number average molecular weight 160,000, exchange capacity 2.56mmol / g, Na + type) was dissolved in 880g N-methyl-2-pyrrolidone (NMP) under anhydrous conditions to obtain a sulfonic acid solution (casting solution), and anhydrous 4,4'-diphenylmethane diisocyanate (MDI) was added Anhydrous fluoroethyl vinyl ether polyol (FEVE, such as structural formula 3, X is Cl, R 1 is ethyl, R 2 is propyl, R 3 for CH 2 CH 2 CH 2 CH 2 , R 4 for CH 2 ) a total of 44g (the ratio of the number of hydroxyl groups-OH to the number of cyanate groups-NCO is 1:0.8), fully dissolved, stirred evenly, and salivated on the surface of a smooth and horizontal Hastelloy plate under anhydrous conditions. Raise the temperature to 150°C to evaporate the solvent for 1 hour to form a film, peel off the glass to obtain an ion-exchange membrane, fluoride with fluorine gas, and then treat with 5% hydrochloric acid to obtain an ion-exchange membrane with an interpenet...
Embodiment 3
[0048] With 420g dry sulfonic acid resin (number average molecular weight 240,000, exchange capacity 1.05mmol / g, Na + type) was dissolved in 880g N,N-dimethylacetamide (DMAc) under anhydrous conditions to obtain a sulfonic acid solution (casting solution), and anhydrous triphenylmethane triisocyanate (TTI), anhydrous fluorine Ethyl vinyl ether polyol (FEVE, such as structural formula 3, X is CF 3 , R 1 is ethyl, R 2 Cyclohexyl, R 3 for CH 2 CH 2 CH 2 , R 4 for CH 2 ) a total of 210g (the ratio of the number of hydroxyl groups - OH to the number of cyanate groups - NCO is 1: 1.5), fully dissolved, stirred evenly, and salivated on a smooth and horizontal glass surface under anhydrous conditions, at 100 ° C Evaporate the solvent for 2 hours to form a film, peel off the glass to obtain an ion exchange membrane, and treat it with 12% hydrochloric acid to obtain an ion exchange membrane with an interpenetrating network structure with a film thickness of 150 microns.
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