Manufacturing method of coiled bipolar membrane

Abstract

The invention discloses a manufacturing method of a coiled bipolar membrane. The method includes: 1) unreeling a coiled sulfonated polystyrene-polyethylene cation exchange dry film reel and a polyolefin film reel respectively, then performing overlapping, then conducting hot-pressing by a four-roll hot press, cooling by a five-roll cooling unit and winding by a winder in order, thus obtaining a single-side coated polyolefin coated positive membrane roll; 2) loosening the polyolefin coated positive membrane roll, spraying a polymeric monomer solution containing a functional monomer, a crosslinking agent and an initiator to the coating surface, carrying out overlapping with a polyester protective film alternately, and performing compaction, then performing winding, placing the whole object in a constant temperature oven and conducting heating to initiate polymerization, and stripping the polyester protective film to obtain an absorption positive membrane roll with single side containing a functional polymer; and 3) selecting a polypropylene isolation net and the absorption positive membrane roll obtained in step 2) to conduct loose alternate winding, carrying out amination reaction in a mixed water solution of dimethylamine and trimethylamine, performing washing, then stripping the polypropylene isolation net, and winding a wet film individually, thus obtaining the coiled bipolar membrane.

Description

technical field [0001] The invention belongs to the technical field of functional polymer thin film manufacturing and membrane separation, and in particular relates to a continuous manufacturing method of roll-type bipolar membrane products. Background technique [0002] Bipolar membranes (full name bipolar ion exchange membranes) are usually composed of a cation exchange membrane layer (referred to as the anode layer), an anion exchange membrane layer (referred to as the cathode layer) and an intermediate transition zone (also known as the catalytic layer). . When the reverse voltage is applied to the bipolar membrane (that is, the cathode layer faces the positive electrode, and the anode layer faces the negative electrode), the charged ions will migrate from the intermediate transition zone to the main solution under the action of a DC electric field. After the original salt ions in the membrane quickly migrated out, the catalytic layer began to catalyze the dissociation ...

AI Technical Summary

Problems solved by technology

First, it can only obtain single-piece bipolar membrane products, and it is difficult to realize continuous production to obtain rolled bipolar membrane products

Second, it is difficult to realize the automatic control of the production process, and the difference between batches is likely to cause large fluctuations in membrane performance

Third, the chemical reaction is affected by various factors, and the thickness of each layer is difficult to control precisely

Fourth, it needs to use chloromethyl ether, a highly carcinogenic raw material, which is very toxic and is not a "green" manufacturing. Industrial production will pollute the environment and there are certain safety hazards

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