A kind of bipolar membrane with porous anodic membrane as base material and preparation method thereof
A technology of bipolar membranes and porous base membranes, applied in the direction of diaphragms, organic diaphragms, electrolytic components, etc., can solve the problem of increased water dissociation voltage of composite bipolar membranes, increased mass transfer resistance, and reduced production efficiency of bipolar membranes. question
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[0042] The present invention provides a method for preparing a bipolar membrane using a porous positive membrane as a substrate according to the above technical solution, which includes the following steps:
[0043] a) Dissolve the cyano polymer in an organic solvent, scrape the resulting membrane solution, and obtain a porous base membrane layer containing cyano functional groups in an aqueous phase separation method; oxidize the cyano groups in the porous base membrane layer to carboxyl groups to obtain Porous structure of cation exchange membrane layer;
[0044] b) Immerse the cation exchange membrane layer in the intermediate layer solution containing the metal ion-amine complex, take it out, place it on the substrate, and dry to obtain the cation exchange membrane layer with the intermediate interface layer;
[0045] c) Casting the anion exchange membrane solution onto the intermediate interface layer of the cation exchange membrane layer with the intermediate interface layer, a...
Embodiment 1
[0060] 1. Preparation method of bipolar membrane
[0061] 1.1 Prepare a polyacrylonitrile membrane solution with a mass concentration of 17%, pour an appropriate amount of the membrane solution on a smooth and clean glass plate, and use an automatic film scraper to scrape the film. Put the glass plate into the container with water quickly, so as not to cause the fluctuation of the water surface as much as possible. As the organic solvent N,N-dimethylformamide gradually dissolves into water, polyacrylonitrile forms a uniform film layer on the glass plate, and puts the prepared finger-shaped hole base film layer into pure water. Used in hydrolysis reaction.
[0062] 1.2 Put the above-mentioned base film layer in 1.5mol / L sodium hydroxide and react in an oven at 60°C for 2 hours. The porous membrane layer was taken out, washed with pure water three times, then the membrane was soaked in 1 mol / L hydrochloric acid for 12 hours, and then the membrane was taken out and washed with pure ...
Embodiment 2
[0092] 2.1 Prepare a polyacrylonitrile membrane solution with a mass concentration of 20%, pour an appropriate amount of the membrane solution on a smooth and clean glass plate, and use an automatic film scraper to scrape the film. Put the glass plate into a container filled with water, put the prepared porous base membrane layer into pure water, and then use it for hydrolysis reaction.
[0093] 2.2 Put the above-mentioned base film layer in 2mol / L sodium hydroxide and react in an oven at 40°C for 2 hours. The porous membrane layer was taken out, washed with pure water three times, and then the membrane was soaked in 2 mol / L hydrochloric acid for 12 hours, and then the membrane layer was taken out and washed with pure water three times.
[0094] 2.3 Prepare a mixed solution of 1,3-propanediamine and cobalt chloride with a mass ratio of 1:5, dissolve 1g of 1,3-propanediamine and 5g of cobalt chloride in pure water and dilute to a 1000mL volumetric flask , The solution was stirred a...
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