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Interpenetrating network ion exchange membrane based on polyurethane and preparation method thereof

An ion exchange membrane and interpenetrating network technology, which is applied in the field of polymer functional membrane materials, 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 proton exchange. The effect of resistance, strong electrochemical corrosion resistance, and simple film forming method

Active Publication Date: 2011-11-23
SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1) The compounding process of membrane materials is difficult to control, the cost is high and the use of sulfonating agent is easy to cause environmental pollution; 2) The treatment process often includes multiple steps, which is difficult to apply to large-scale batch production

Method used

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  • Interpenetrating network ion exchange membrane based on polyurethane and preparation method thereof
  • Interpenetrating network ion exchange membrane based on polyurethane and preparation method thereof
  • Interpenetrating network ion exchange membrane based on polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] With 120g dry sulfonic acid resin (number average molecular weight 80,000, exchange capacity 1.25mmol / g, H + type) was dissolved in 880g N,N-dimethylformamide (DMF) under anhydrous conditions to obtain a sulfonic acid solution (casting solution), adding anhydrous toluene-2,4-diisocyanate 4.5g, anhydrous Trimethylolpropane (TMP) 3.5g (ratio of both hydroxyl-OH numbers and cyanate group-NCO numbers is 1:1), after fully dissolving and stirring evenly, under anhydrous conditions in a smooth and horizontal The surface of the glass is salivated, the solvent is evaporated at 75°C for 10 hours to form a film, and the ion exchange membrane is obtained after peeling off the glass, and fluorinated with fluorine gas to obtain an ion exchange membrane with an interpenetrating network structure with a film thickness of 50 microns.

Embodiment 2

[0036] With 45g dry sulfonic acid resin (number average molecular weight 150,000, exchange capacity 2.55mmol / 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 A total of 44g of anhydrous pentaerythritol (the ratio of the number of hydroxyl groups-OH to the number of cyanate groups-NCO is 1:0.8), fully dissolved and stirred evenly, under anhydrous conditions on the surface of a smooth and horizontal Hastelloy plate Salivate, heat up to 150°C to evaporate the solvent for 1 hour to form a film, and peel off from the glass to obtain an ion-exchange membrane with an interpenetrating network structure with a film thickness of 20 microns.

Embodiment 3

[0038] With 420g dry sulfonic acid resin (number average molecular weight 250,000, 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), adding anhydrous triphenylmethane triisocyanate (TTI), anhydrous A total of 210g of diethylene glycol acetal (the ratio of the number of hydroxyl groups - OH to the number of cyanate groups - NCO is 1: 1.5), after fully dissolving and stirring evenly, drool on a smooth and horizontal glass surface under anhydrous conditions , The solvent was evaporated at 100°C for 2 hours to form a film, and the ion exchange membrane was obtained after peeling off from the glass, and fluorinated with fluorine gas to obtain an ion exchange membrane with an interpenetrating network structure with a film thickness of 150 microns.

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Abstract

The invention relates to an interpenetrating network ion exchange membrane based on polyurethane and preparation method thereof. Polar organic solvent is adopted to dissolve perfluorinated sulfonic acid resin and anhydrous poly isocyanate as well as anhydrous polyalcohol; tape casting is adopted to form a membrane on smooth solid surface; then heating is carried out and poly isocyanate and anhydrous polyalcohol take polymerization, and products of the polymerization and perfluorinated sulfonic acid molecule chain form ion exchange membrane in macromolecule interpenetrating network structure. The membrane preparation method can obtain ion exchange membrane material with favourable proton commutativity, overcomes the defect that the existing fusion mould pressing process can not prepare homogeneous cross linking ion exchange membrane and has the advantages of simple technological process and easy industrial scale-up.

Description

technical field [0001] The invention relates to an ion exchange membrane, in particular to a polyurethane-based interpenetrating network ion exchange membrane for an all-vanadium redox flow battery (VRB) and a preparation method thereof, belonging to the field of polymer functional membrane materials. Background technique [0002] As a new type of green and environmentally friendly energy storage battery, the all-vanadium redox flow battery is a new type of green secondary battery with adjustable capacity and power, high current non-destructive deep discharge, long service life, easy operation and maintenance, etc. advantage. As a large-scale energy storage system with a single metal ion, it avoids the electrolyte cross-contamination problem of traditional lead-acid batteries and Fe / Cr batteries, and shows great advantages in stationary energy storage devices applied to renewable energy. It can be charged both by electricity and mechanically by exchanging electrolyte, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/18H01M4/94H01M4/88C08J5/22C08J7/12C08G18/32C08G18/67C08G18/73C08L75/14C08L27/18
CPCY02E60/50
Inventor 张永明刘小宁张恒王学军
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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