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A method of manufacturing a monovalent ion selective cation exchange membrane

A cation-exchange membrane and ion-selective technology, applied in the direction of coating, etc., can solve the problems of difficulty in ensuring the consistency of the treatment effect, damage to the basement membrane structure, etc., and achieve the effects of long-lasting monovalent cation selection performance, improved production efficiency, and smooth surface

Active Publication Date: 2017-06-06
QUZHOU LANRAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the latter two methods require precise control of the thickness of the cross-linked layer (bonding layer), and generally require an organic solvent reaction system to strengthen the cross-linking, which is likely to damage the structure of the basement membrane, and it is difficult to ensure the consistency of the treatment effect sex

Method used

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  • A method of manufacturing a monovalent ion selective cation exchange membrane
  • A method of manufacturing a monovalent ion selective cation exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: a) First prepare the prepolymerization solution: in a 20-liter glass jacketed reactor, add 6.7 kilograms of p-chloromethylstyrene (the content is 91.3%, containing 6% of m-chloromethylstyrene, o-chlorine Methylstyrene 1.5%), 2.1 kilograms of styrene, 1.2 kilograms of divinylbenzene (the content is 80.2%), 30 grams of benzoyl peroxide, stirred at room temperature for 30 minutes; nitrogen gas was blown into, and the temperature was raised after 45 minutes to 50°C, pre-polymerized at a constant temperature for 220 minutes, and transferred to a spray container for later use; b) dry film rolls of LCM series cation exchange homogeneous membranes (provided by Liaoning Yichen Membrane Technology Co., Ltd., width 60.0 cm, thickness 0.15 mm, The length is 120 meters) according to the linear speed of 2.4 meters per minute, after passing through the working box with a constant temperature of 54-58 ℃; the spraying device is turned on, and the spraying speed is controlled at 3...

Embodiment 2

[0035] The composition of the prepolymerization solution in step 1-a of Example 1 is changed to: 8.3 kilograms of p-chloromethylstyrene (purity consistent with Example 1), 0.5 kilogram of styrene, 1.2 kilograms of divinylbenzene (purity Consistent with embodiment 1), 32 grams of benzoyl peroxide. The rest of the materials used (including the base cationic membrane), the operation method, the implementation process and other manufacturing conditions are consistent with those described in Example 1, and the monovalent ion-selective cation exchange membrane is obtained.

[0036] Measured by the same method: the wet film thickness of the prepared monovalent ion-selective cation exchange membrane is 0.16 to 0.17 millimeters, the cation exchange capacity is 1.92 millimoles per gram of dry film, and the membrane surface resistance is 4.9 Ω cm 2 , select the transmission coefficient T Na Ca = 0.15.

Embodiment 3

[0038] Replace the dry film roll of the LCM series cation-exchange homogeneous membrane in step 1-b of Example 1 with the dry film roll of the HCM series cation-exchange homogeneous membrane (provided by Liaoning Yichen Membrane Technology Co., Ltd., width 60.0 cm , thickness 0.28 millimeters, length 150 meters), all the other materials used (comprising pre-polymerization solution), operating method, implementation process and other manufacturing conditions are all consistent with those described in Example 1, making the described monovalent ion-selective cation exchange membrane .

[0039]After inspection: a) The wet film thickness of the base cathodic membrane is 0.30-0.32 mm, the cation exchange capacity is 2.08 millimoles per gram of dry film, and the membrane surface resistance is 5.8Ω·cm 2 , select the transmission coefficient T Na Ca =1.4; b) measured by the same method: the wet film thickness of the prepared monovalent ion-selective cation exchange membrane is 0.30~0...

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Abstract

A method of manufacturing a monovalent ion selective cation exchange membrane is disclosed. The method includes a step 1) of unwinding a polystyrene-polyethylene series cation exchange membrane dry roll at a constant temperature, spraying one surface of the roll with a pre-polymerization liquid containing a functional monomer, a crosslinking agent and an initiator, laminating the roll with polyester protective membranes at intervals, tightly compressing, and then rolling to obtain a coated cation membrane roll one surface of which is coated with the pre-polymerization liquid; a step 2) of heating the coated cation membrane roll in the step 1) in a constant-temperature oven, initiating polymerization, taking the coated cation membrane roll out, peeling the polyester protective membranes off, and rolling with a polypropylene separating screen in a loose and interval manner to obtain a screen-separated cation membrane roll; and a step 3) of submerging the screen-separated cation membrane roll in the step 2) into an aqueous solution of trimethylamine to perform a quaternization reaction, washing a product, then peeling the polypropylene separating screen off, and separately rolling a wet membrane, and then the monovalent ion selective cation exchange membrane is obtained.

Description

technical field [0001] The invention belongs to the technical field of functional polymer film manufacturing and electric-driven membrane separation, and in particular relates to a continuous manufacturing method of monovalent ion-selective cation exchange membrane products. Background technique [0002] Ion-exchange membrane (Ion-exchange membrane) refers to a functional membrane immobilized with chemical groups that can perform ion exchange. If anions (such as sulfonic acid groups) are immobilized, it is a cation exchange membrane (Cation exchange membrane), which can exchange and conduct cations (such as sodium ions) under the action of a DC electric field; if cations (such as quaternary ammonium group) is the anion exchange membrane (Anion exchange membrane), which can exchange and conduct anions (such as chloride ions) under the action of a direct current electric field. Due to the unique ion exchange and conductivity characteristics of ion exchange membranes, it has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J7/04C08J7/00C08J5/22C08L23/06C08L25/08C09D125/18
Inventor 雷引林杨建锋李治辉陈文澜
Owner QUZHOU LANRAN NEW MATERIAL CO LTD
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