Method for preparing homogeneous-phase cation-exchange membrane

The technology of a cation exchange membrane and a manufacturing method, which is applied to the manufacturing field of homogeneous cation exchange membrane, can solve the problems of small amount of entry, viscosity of the solution, waste after one use, etc., and achieves high capacity, reduced impregnation temperature, and mechanical properties. Enhanced effect

Active Publication Date: 2011-07-27
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

The disadvantages of this method are (1) the use of high-density polyethylene film and ultra-high molecular weight polyethylene film as the base film
Due to the high crystallinity of the polyethylene film, the compact structure, and the small range of amorphous regions, styrene and divinylbenzene are not easy to enter the interior of the film. It is necessary to partially destroy the crystalline region of the film at high temperature (70-90°C) to make it Styrene and divinylbenzene enter, but the amount of entry is not much, so the prepared basement film contains the amount of styrene and divinylbenzene (called the impregnation rate, which is defined as the basement film after immersion and polymerization under pressure and heating). The weight of the obtained base film (w 2 ) minu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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) to obtain a granular blend through particle selection. Next, heat the granular blend on a casting machine (temperature 290-250°C) to melt, and cast 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 f...

Embodiment 2

[0029] Polyethylene and ethylene-octene copolymer elastomer (45% octene) blend film (elastomer content 40%)

[0030] The operating steps are the same as in Example 1. The impregnation time of the basement film at room temperature is 3 hours, and the impregnation rate of the basement film is 75%. Sulfonation conditions: sulfonation in concentrated sulfuric acid at 75° C. for 10 hours to obtain a cation exchange membrane with a cation exchange capacity of 2.5 milliequivalents / gram dry membrane.

[0031] Cation exchange membrane properties:

[0032] Thickness 0.23mm, ion exchange capacity 2.5 milliequivalents / g dry film, water content 40%

[0033] Surface resistance: 1 cm 2 , migration number 99%, burst strength > 0.25MPa

Embodiment 3

[0035]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 basement membrane was sulfonated at a temperature of 80° C. for 8 hours to obtain a cation exchange membrane with a cation exchange capacity of 2.9 meq / g dry membrane.

[0036] Cation exchange membrane properties:

[0037] Thickness 0.23mm, ion exchange capacity 2.9 mg equivalent / g dry film, water content 45%

[0038] Surface resistance: 0.5 cm 2 , Migration number 99%, Bursting strength> 0.25MPa

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Abstract

The invention relates to a method for preparing a homogeneous-phase cation-exchange membrane. In the method, a binary blending alloy film of polyethylene and the copolymer elastomer of ethylene and octylene, or the ternary blending alloy film of polyethylene, copolymer elastomer of ethylene and octylene and isobutylene rubber is taken as a basilar membrane. The method comprises the following steps: dipping the basilar membrane into the solution containing styrene, divinyl benzene and peroxide benzoyl; pressurizing an impregnated film and heating and polymerizing to obtain the basilar membrane; and sulfonating the basilar membrane in concentrated sulfuric acid to obtain the cation-exchange membrane. The cation-exchange membrane has the advantages that: the alloy membrane has elasticity and flexibility, greatly enhanced mechanical property and toughness; the impregnated temperature is reduced greatly; and the polyethylene and ethylene solution can be recycled, the prepared cation-exchange membrane has high capacity which can be 2.5 milliequivalent/g dry film, the sheet resistance is about 1cm<2>, and the dichloroethane is not needed for pre-swelling the basilar membrane during the sulfonation.

Description

technical field [0001] The invention relates to a method for manufacturing a cation exchange membrane in membrane separation materials in the field of chemical engineering. Background technique [0002] The cation 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 a cation exchange membrane by the impregnation method of impregnating a polyethylene film 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 use...

Claims

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Application Information

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IPC IPC(8): C08J7/16C08J7/14C08L23/06C08L23/08C08L23/20B01D71/26B01D67/00B01J39/20
Inventor 葛道才
Owner 福建省延润膜环保科技有限公司
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