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A method of manufacturing a rolled bipolar membrane

A manufacturing method and technology of bipolar membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of continuous production of bipolar membrane products, difficulty in precise control of thickness, and difficulty in automatic control and other issues to achieve the effect of reducing uncertain risks, stable performance indicators, and close integration

Active Publication Date: 2020-11-27
QUZHOU LANRAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A method of manufacturing a rolled bipolar membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Take the dry film roll of LCM series cation exchange homogeneous membrane (provided by Liaoning Yichen Membrane Technology Co., Ltd., the performance indicators are as follows: the width is 60.0 cm, the thickness is 0.12 mm, the length is 120 meters, and the cation exchange capacity is 2.13 Millimoles per gram of dry film) and polyolefin film rolls (the material is composed of: linear low-density polyethylene (Mitsui Chemicals, brand 4570): polyisobutylene (BASF, brand B200): POE polyolefin elastomer (Dow Chemical, brand 8452)=100:12:9 (mass ratio), the width is 63.0 centimeters, the thickness is 0.05 millimeters, and the length is 400 meters), all according to the line speed of 3.8 meters per minute. top, all covering the lower positive film) into the four-roller calender, the temperature of the four-roller is 110, 108, 106, 104°C in sequence, and the distance between each roll is accurately adjusted to 0.14-0.15 mm, and it is cooled immediately by the five-roll...

Embodiment 2

[0039] Step 1: Roll the dry film of the LCM series cation exchange homogeneous membrane (select the product of Liaoning Yichen Membrane Technology Co., Ltd., the performance indicators are as follows: the width is 60.0 cm, the thickness is 0.10 mm, the length is 100 meters, and the cation exchange capacity is 2.02 millimoles per gram of dry film) and polyolefin film rolls (the material is composed of: low-density polyethylene (Mitsui Chemicals, brand 403): polyisobutylene (BASF, brand B200): POE polyolefin elastomer (Mitsui Chemicals, brand 840 )=100:7:8 (mass ratio), the width is 63.0 cm, the thickness is 0.04 mm, and the length is 300 m), all are unwound according to the line speed of 3.0 m / min, after lamination (the polyolefin film surface is on the top , all covering the lower positive film) into the four-roller calender, the temperature of the four-roller is 107, 105, 103, 102°C in sequence, and the distance between each roll is accurately adjusted to 0.12-0.13mm, and it e...

Embodiment 3

[0044] Step 1: Take the dry film roll of LCM series cation exchange homogeneous membrane (provided by Liaoning Yichen Membrane Technology Co., Ltd., the performance indicators are as follows: the width is 60.0 cm, the thickness is 0.11 mm, the length is 130 meters, and the cation exchange capacity is 1.95 Millimoles per gram of dry film) and polyolefin film rolls (the material is composed of: metallocene linear low-density polyethylene (Exxon Chemical, brand 2018CA): EPDM rubber (U.S. Dow, brand 660)=100: 24 (mass ratio), the width is 62.0 cm, the thickness is 0.04 mm, and the length is 250 meters), all of which are unwound at a line speed of 3.0 m / min. positive film) into the four-roll calender, the temperature of the four rolls is 107, 105, 103, 102 °C in sequence, and the distance between each roll is precisely adjusted to 0.13-0.14 mm, and immediately enters the constant tension winding machine after being cooled by the five-roll cooling unit. Continuous winding, that is, ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/42B01D69/12B01D67/00
Inventor 雷引林李治辉陈文澜
Owner QUZHOU LANRAN NEW MATERIAL CO LTD
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