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Preparation method of bipolar membrane

A technology of bipolar membranes and basement membranes, applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve unfavorable ion rapid exchange and transfer, low degree of dissociation of sodium carboxylate groups, slow ion exchange speed, etc. problem, to achieve the effect of accelerating water dissociation, improving water dissociation efficiency, and improving ion exchange capacity

Inactive Publication Date: 2021-02-02
ZHEJIANG BLUE POLAR MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, as far as the preparation methods of some bipolar membranes reported in the known literature are concerned, there are some deficiencies, for example: the Chinese patent application number 201510987546.5 discloses a Zn 2+ -TiO 2 The preparation method of modified polyethyleneimine / sodium polyacrylate bipolar membrane, it uses polyethyleneimine as negative membrane layer, sodium polyacrylate as positive membrane layer, by adding Zn 2+ -TiO 2 The powder changes the properties of the middle layer, so that the prepared membrane is closely combined and not easy to delaminate; but because the dissociation degree of the sodium carboxylate group contained in the positive membrane layer is not high, the ion exchange speed is slow; the used The active groups contained in the anion membrane layer are weakly alkaline, which is not conducive to the rapid exchange and transfer of ions

Method used

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  • Preparation method of bipolar membrane
  • Preparation method of bipolar membrane

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Embodiment 1

[0026] In the embodiment of the present invention, a method for preparing a bipolar membrane is disclosed, which specifically includes the following steps:

[0027] S1. Mix 30% polypropylene, 5% ethylene propylene copolymer, 60% ethylene butene copolymer, and 5% ethylene octene copolymer evenly, heat to 200-230°C for kneading and granulation, after drying, flow Extended into a raw material film with a thickness of 0.2mm;

[0028] S2. Mix 55% absolute ethanol, 40% styrene monomer, and 5% divinylbenzene monomer to form an irradiation solution, place it in a stainless steel bucket, and cut the raw material film prepared in step S1 to the required size (determined according to actual production requirements), then immerse the cut raw material film in the irradiation liquid, seal the stainless steel barrel, feed nitrogen, and place it in a constant temperature box at 5°C, and use 60Coγ-rays to irradiate and graft at a constant temperature , the irradiation dose is 5KGy, after irra...

Embodiment 2

[0034] S1. Mix 35% polypropylene and 65% ethylene-butylene copolymer evenly, heat to 150-230°C for kneading and granulation, after drying, cast to make a raw material film with a thickness of 0.23mm;

[0035] S2. Mix 50% absolute ethanol, 38% styrene monomer, and 12% divinylbenzene monomer to form an irradiation solution, place it in a stainless steel barrel, and cut the raw material film prepared in step S1 to the required size (determined according to actual production requirements), and then immerse the cut raw material film in the irradiation liquid, seal the stainless steel barrel, feed nitrogen, and place it in a constant temperature box at 0°C, and use 60Coγ-rays to irradiate and graft at a constant temperature , the irradiation dose is 4.5KGy, after irradiation and grafting, use polyethylene glycol aqueous solution to soak for 24 hours, and after drying, the basement membrane for preparing the ion exchange membrane is obtained;

[0036] S3. Introduce anion / cation excha...

Embodiment 3

[0041] S1. Mix 30% polypropylene, 65% ethylene-butylene copolymer, and 5% ethylene-octene copolymer evenly, heat to 180-230°C for kneading and granulation, and after drying, cast to make a 0.25mm thick Raw film;

[0042] S2. Mix 60% absolute ethanol, 25% styrene monomer, and 15% divinylbenzene monomer to form an irradiation solution, place it in a stainless steel barrel, and cut the raw material film prepared in step S1 to the required size (determined according to actual production requirements), and then immerse the cut raw material film in the irradiation liquid, seal the stainless steel barrel, feed nitrogen, and place it in a constant temperature box at 0°C, and use 60Coγ-rays to irradiate and graft at a constant temperature , the irradiation dose is 5KGy, after irradiation and grafting, use polyethylene glycol aqueous solution to soak for 18 hours, and after drying, obtain the basement membrane for preparing ion-exchange membrane;

[0043] S3. Introduce anion / cation exc...

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Abstract

The invention belongs to the technical field of bipolar membranes, and discloses a preparation method of a bipolar membrane. The method comprises the following steps: blending at least one of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-octene copolymer with polypropylene, heating, mixing, granulating, drying, and casting to obtain a raw material membrane; immersing the raw material membrane into an irradiation solution formed by mixing absolute ethyl alcohol, a styrene monomer and a divinylbenzene monomer, and carrying out constant-temperature irradiation grafting by using 60Co gamma rays at -5-15 DEG C to obtain a base membrane; introducing anion / cation exchange groups into two sides of the base membrane respectively, soaking the base membrane into sulfuric acid for heating sulfonation at 75 DEG C by taking silver sulfate as a catalyst on one side through a covering protection method, and hydrolyzing to form a cation membrane layer after reaction ina reaction kettle; and adding chloromethyl ether into the other side of the bipolar membrane at 45 DEG C by taking stannic chloride as a catalyst, carrying out chloromethylation, and then immersing the bipolar membrane into a mixed aqueous solution of trimethylamine and polyethylene glycol at 40 DEG C to carry out quaternization reaction to form a negative membrane layer so as to obtain the bipolar membrane.

Description

technical field [0001] The invention belongs to the technical field of bipolar membranes, and in particular relates to a preparation method of bipolar membranes. Background technique [0002] The bipolar membrane is a special ion exchange membrane. One side of the membrane is a cation exchange membrane layer, the other side is an anion membrane layer, and the middle is a water layer; The water dissociation in the middle water layer between produces hydrogen ions and hydroxide ions, which respectively pass through the cation exchange membrane and the anion exchange membrane to provide hydrogen ions and hydroxide ions, thereby forming a replacement reaction with the salt solution in the raw material solution. acids and bases. Therefore, an electrodialysis unit consisting of a bipolar membrane can be used for acid-base production from salt. [0003] At present, as far as the preparation methods of some bipolar membranes reported in the known literature are concerned, there ar...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D61/44C08J7/18C08J7/14C08J7/12C08J5/18C08L23/12C08L23/08
CPCB01D67/0006B01D69/02B01D61/445C08J7/18C08J7/14C08J7/12C08J5/18C08J2323/08C08J2423/12C08J2423/08B01D2325/42
Inventor 秦小君
Owner ZHEJIANG BLUE POLAR MEMBRANE TECH
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