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Preparation method of semi-homogeneous bipolar membrane

A semi-homogeneous, bipolar membrane technology, used in semi-permeable membrane separation, chemical instruments and methods, membranes, etc. problem, to achieve the effect of excellent mechanical properties

Active Publication Date: 2021-03-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN111111794A discloses a method for preparing a heterogeneous bipolar membrane. This method adopts the design of non-mesh bonding, so that the anion and yang membranes are pressed tightly and are not easy to peel off. However, the bipolar membrane prepared by this method is inherently It is difficult to be widely used due to problems such as high electrical resistance, high water dissociation voltage, and serious water permeability.
Chinese patent CN109876678A discloses a bipolar membrane and a preparation method. The method prepares a bipolar membrane through four steps of impregnation, polymerization, sulfonation and quaternization, which simplifies the preparation process and avoids the toxic methylation process. And it has the same exchange capacity and transmembrane voltage as other bipolar membranes, but the patent does not clearly indicate the water dissociation efficiency and membrane surface resistance of the bipolar membrane prepared by this method
Although the bipolar membrane prepared by this method is super-hydrophilic, the membrane resistance is small, and the thermal stability is good, the preparation process is complicated and the production cost is high.

Method used

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  • Preparation method of semi-homogeneous bipolar membrane
  • Preparation method of semi-homogeneous bipolar membrane
  • Preparation method of semi-homogeneous bipolar membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Preparation of plastic resin powder

[0030] Weigh 40kg of polyethylene particles and 200kg of polyisobutylene particles, melt and blend them at 150°C for 10 minutes, melt them at 150°C with a twin-screw extruder, pass through a multi-channel filament nozzle, extrude, stretch, and water-cool A continuous filament with a diameter of about 1.5 mm was obtained, which was cut with a pulse cutter to obtain columnar particles with a length of 3 mm.

[0031] 50 kg of the prepared columnar particles were immersed in 60.6 kg of a mixed monomer solution, which was composed of 55.5 parts by weight of styrene, 4.5 parts by weight of divinylbenzene (as a crosslinking agent) and 0.6 parts by weight of peroxide Benzoyl (BPO, as an initiator) is mixed and prepared, soaked at room temperature for 2 hours; take out the columnar particles, dry them in a centrifuge, and put them into 0.6kg polyvinyl alcohol (as a dispersant) and 600L deionized water In the formed solution, stir evenly,...

Embodiment 2

[0054] Example 2 The experimental process of preparing the bipolar membrane was repeated in Example 1, except that in "step 1), the soaking time at room temperature was changed from 2h to 3h", and other operations were the same as in Example 1 to obtain a bipolar membrane.

Embodiment 3

[0056] Example 3 The experimental process of preparing the bipolar membrane was repeated in Example 1, except that in "step 1), the soaking time at room temperature was changed from 2h to 4h", and other operations were the same as in Example 1 to obtain a bipolar membrane.

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Abstract

The invention discloses a preparation method of a semi-homogeneous bipolar membrane, which comprises the following steps: 1) carrying out melt blending, extrusion and granulation on polyethylene and polyisobutene, impregnating particles with styrene and divinyl benzene, and carrying out polymerization reaction with polyvinyl alcohol to obtain plastic resin powder; 2) sulfonating the plastic resinpowder to obtain semi-homogeneous cation resin, carrying out chloromethylation on the plastic resin powder, and carrying out quaternization to obtain semi-homogeneous anion resin; 3) respectively anduniformly mixing the plastic anion / cation resin with ion exchange resin powder, polyethylene powder and titanium dioxide powder, and sequentially carrying out melt blending in an internal mixer and sheet discharging in a two-roller open mill to respectively obtain single cation / anion resin membranes; and (5) adhering the cation / anion resin membranes together, covering the cation / anion resin membranes with reinforcing mesh cloth, and pressing the cation / anion resin membranes with a hot press to obtain the semi-homogeneous bipolar membrane. The semi-homogeneous bipolar membrane prepared by adopting the method is greatly superior to a conventional heterogeneous bipolar membrane in water dissociation performance, and meanwhile, the characteristics of lower production cost and excellent mechanical properties of the heterogeneous bipolar membrane are maintained.

Description

technical field [0001] The invention belongs to the technical field of bipolar membrane preparation, in particular to a method for preparing a semi-homogeneous bipolar membrane. Background technique [0002] Bipolar membrane is a special ion exchange membrane, which is made of composite cation exchange membrane and anion exchange membrane. Under the action of a direct current electric field, the bipolar membrane can dissociate the water molecules in the middle layer into H+ and OH - , thus generating acids and bases corresponding to salt ions. In recent years, bipolar membranes have been widely used in environmental pollution control, acid-base preparation, pharmaceutical industry, seawater desalination and other fields, and have contributed a lot to changing traditional industrial separation and preparation. [0003] The existing bipolar membrane preparation methods are generally as follows: (1) hot pressing method, the dry positive membrane and negative membrane are lami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/12B01D71/26C08F255/02C08F255/10C08F212/08C08F212/36C08F8/36C08F8/24C08F8/44
CPCB01D67/0002B01D69/02B01D69/12B01D71/26C08F255/02C08F255/10C08F8/36C08F8/44B01D2325/42C08F212/08C08F212/36C08F8/24Y02E60/50
Inventor 潘杰峰余晓洪赵磊陶彦耀刘玲玲刘立芬赵雪婷
Owner ZHEJIANG UNIV OF TECH