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Method for manufacturing homogeneous ion exchange membrane

A technology of anion exchange membrane and manufacturing method, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of polymerization reaction, high surface resistance and high price of aminating agent

Active Publication Date: 2011-05-25
福建省延润膜环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of this method are (1) the use of high-density polyethylene film and ultra-high molecular polyethylene film as raw material film
Due to the high crystallinity and compact structure of polyethylene film, styrene and divinylbenzene are not easy to enter the film, and it is necessary to partially destroy the crystallization area of ​​the film at high temperature (70-90°C) to make styrene and divinylbenzene Into the inside of the film, but the amount of entry is not much, so the amount of styrene and divinylbenzene in the prepared base film (called the impregnation rate) is not high, up to 45%, and the exchange capacity of the anion exchange membrane prepared in this way is not high , the surface resistance is large
(2) In this method, the membrane is immersed at 70-90°C, and the initiator benzoyl peroxide will be decomposed and initiated at 80°C. Can be used once and then scrapped
(3) This method uses 25% trimethylamine acetone solution for quaternization, the price of the aminating agent is high, and acetone is flammable, with hidden dangers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 3 kg of commercially available polyethylene pellets (melt index 0.75-1.4) with 2 kg of commercially available ethylene-octene copolymer (brand POE-8003) containing 20% ​​octene elastomer in a granulator, melt ( temperature 190-220°C) and granulate to obtain a granular blend. Next, heat the granular blend on a casting machine (at a temperature of 190-250°C) to melt and cast it to obtain a blended gold film of 0.18±0.01mm, which is the self-made raw material film (hereinafter referred to as the base film). Cut the above-mentioned basement film into 800mm×400mm thickness of 0.18mm and put them together with styrene, divinylbenzene (cross-linking agent, the dosage is 7% of the amount of styrene) and benzoyl peroxide (initiator, The amount is 0.5%-1% of the amount of styrene) in the stainless steel tank of the solution, let it stand at room temperature (about 25°C) for 4 hours, take it out, drain it, spread the impregnated film on the polyester film, impregnated the film...

Embodiment 2

[0034] Polyethylene and octene copolymer elastomer (containing 45% octene) blend film (40% elastomer content)

[0035] The operating steps are the same as in Example 1. The impregnation time of the base film at room temperature was 3 hours, and the impregnation rate of the base film was 75%, and the base film was reacted in the methyl chloride ether containing 3% anhydrous tin tetrachloride, and the conditions were all the same as in Example 1, and the methyl chloride obtained The base membrane was reacted in 20% trimethylamine aqueous solution at 35°C for 15 hours to obtain an anion exchange membrane.

[0036] Anion exchange membrane properties:

[0037]Thickness 0.22mm, ion exchange capacity 2.2 mg equivalent / g dry film, water content 30%

[0038] Surface resistance: 6 cm 2 , migration number 95%, burst strength > 0.25MPa

Embodiment 3

[0040] Use polyethylene and ethylene and octene copolymer elastomer (containing 30% octene) blend film (elastomer content is 50%) The operation steps are the same as in Example 1, the impregnation temperature of the base film is 40 ° C, and the impregnation time is 2 hours , to obtain a base film with an impregnation rate of 80%. The base film was reacted in chloromethyl ether containing 5% anhydrous tin tetrachloride, and the conditions were all the same as the chloromethyl film of Example 1. Then the chloromethyl membrane was soaked in 30% trimethylamine aqueous solution and reacted at 40°C for 8 hours to obtain an anion exchange membrane.

[0041] Anion exchange membrane properties:

[0042] Thickness 0.22mm, ion exchange capacity 2.4 mg equivalent / g dry film, water content 35%

[0043] Surface resistance: 6 cm 2 , migration number 96%, burst strength > 0.25MPa

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Abstract

The invention discloses a method for manufacturing a homogeneous ion exchange membrane, which comprises the following steps: impregnating a polyethylene and ethylene-octylene copolymer elastomer blended alloy membrane or a polyethylene, ethylene-octylene copolymer elastomer, and polyisobutylene rubber blended alloy membrane, which serves as a substrate membrane, with solution of styrene, divinyl benzene and benzoyl peroxide, pressurizing and heating the impregnated membrane for polymerization to obtain a base membrane; and chloromethylating the base membrane in chloromethyl ether solution containing anhydrous stannic chloride to obtain a chloromethyl membrane, and quaternizing the chloromethyl membrane in aqueous solution of trimethylamine to obtain the ion exchange membrane. The method has the advantages of greatly reducing an impregnation temperature, and reusing solution of styrene and divinyl benzene. The capacity of the manufactured ion exchange membrane is up to 2.2 milligram equivalent per gram of dry membrane, and the sheet resistance of the manufactured ion exchange membrane is about 6 omega m<2>.

Description

technical field [0001] The invention relates to a method for manufacturing anion exchange membranes in membrane separation materials in the field of chemical engineering. Background technique [0002] The anion exchange membrane is one of the key components in the ion exchange membrane electrodialysis device. Ion exchange membrane electrodialysis devices are widely used in desalination of seawater and brackish water to prepare drinking water, desalination and purification of organic compounds, preparation of high-purity water and ultra-pure water for high-pressure boilers in the semiconductor industry, electronics industry and power plants, and industrial wastewater treatment and reuse. [0003] A method for producing an impregnated anion exchange membrane using a polyethylene film as a base membrane impregnated with styrene or divinylbenzene is known. US Patent No. 4,024,043 discloses a method for manufacturing a bipolar membrane based on a polyethylene film. This method ...

Claims

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Application Information

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IPC IPC(8): B01D71/28B01D71/82B01D67/00C08J5/22
Inventor 葛道才
Owner 福建省延润膜环保科技有限公司
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