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Preparation method of semi-homogeneous phase anion exchange membrane

An anion exchange membrane, ion exchange membrane technology, applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve the difficulty of surface and internal ion exchange group uniformity, chemical reaction process, and technical difficulty. problems, to achieve good dimensional stability, reduce technical difficulty, and improve production efficiency.

Active Publication Date: 2019-07-02
海丝节水科技(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the most common styrene / divinylbenzene system is used, it is relatively complicated to introduce strong basic anion exchange groups through chloromethyl / quaternization, especially to control the surface and internal ion exchange groups of the entire membrane. The uniformity of the group is difficult, the chemical reaction process is relatively difficult, and very precise control methods are required. The requirements for hot-press polymerization and membrane functionalization equipment are high, and the technical difficulty is relatively high.

Method used

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  • Preparation method of semi-homogeneous phase anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a) Polyvinylidene fluoride, chloromethylated polystyrene (15% chlorine content), N,N-dimethylacetamide, ethylene glycol dimethacrylate, dibenzoyl peroxide The mass ratio is: 12:20:150:2:0.4. According to the above ratio, it is configured into a uniform casting solution with a viscosity of about 2900cps;

[0029] b) Coating the casting solution on ultra-high molecular weight polyethylene grid cloth after ultrasonic degassing to form a semi-homogeneous chloromethylated polystyrene film with a thickness of 0.16 mm;

[0030] c) Pass the film formed in step b through a hot water tank, put it in hot water for heat treatment with hot water, treat it at a temperature of 50°C for 5 minutes, and then treat it at a temperature of 90°C for 25 minutes, and mix N, N - Removal of dimethylacetamide, and at the same time, a cross-linked structure is formed inside the membrane to prepare a continuous roll of semi-homogeneous chloromethylated membrane, which is then soaked in trimethylami...

Embodiment 2

[0032] a) The mass ratio of polyvinylidene fluoride, chloromethylated polystyrene (chlorine content is 23%), N-methylpyrrolidone, divinylbenzene, and azobisisobutyronitrile is 18:20: 150: 2: 0.27, according to the above ratio, it is configured into a uniform casting solution with a viscosity of about 3500cps;

[0033] b) Coating the casting solution on polypropylene grid cloth after ultrasonic defoaming to form a semi-homogeneous chloromethylated polystyrene film with a thickness of 0.19 mm;

[0034] c) Pass the film formed in step b through a hot water tank, put it in hot water for heat treatment with hot water, treat it at a temperature of 60°C for 10 minutes, and then treat it at a temperature of 90°C for 20 minutes, and add N-formazan The base pyrrolidone is removed, and a cross-linked structure is formed inside the membrane to prepare a continuous roll of semi-homogeneous chloromethylated membrane, which is then soaked in trimethylamine aqueous solution for 12 hours and a...

Embodiment 3

[0036] a) the mass ratio of polyvinylidene fluoride, chloromethylated polystyrene (chlorine content is 18%), N, N-dimethylformamide, divinylbenzene, dibenzoyl peroxide is: 15: 15: 130: 1.5: 0.3, according to the above ratio, configure a uniform casting solution with a viscosity of about 3200cps;

[0037] b) coating the casting solution on nylon mesh cloth after ultrasonic degassing to form a semi-homogeneous chloromethylated film with a thickness of 0.18 mm;

[0038] c) Pass the film formed in step b through a hot water tank, put it in hot water for heat treatment with hot water, treat it at a hot water temperature of 50°C for 5min, and then treat it at a hot water temperature of 85°C for 22min, and mix N,N - Removal of dimethylformamide, and at the same time, a cross-linked structure is formed inside the membrane to prepare a continuous roll of semi-homogeneous chloromethylated membrane, and then soak it in an aqueous solution of trimethylamine for 24 hours and at a temperatu...

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Abstract

The invention discloses a preparation method of a semi-homogeneous phase anion exchange membrane. The method is as follows: polyvinylidene fluoride, chloromethylated polystyrene, a crosslinking agentand an initiator are dissolved in an organic solvent to form a uniform mixed membrane casting solution, ultrasonic defoaming is performed and then the membrane casting solution is coated on a reinforced mesh cloth, the membrane is passed through a hot water tank to remove the organic solvent and make the interior of the membrane form a crosslinking structure to obtain a continuous rolled semi-homogeneous phase chloromethylation membrane, the membrane is soaked in a trimethylamine aqueous solution for a certain time and then transformation is carried out by a sodium chloride solution, and the continuous rolled semi-homogeneous phase anion exchange membrane is obtained after washing with water. According to the preparation method of the semi-homogeneous phase anion exchange membrane, the membrane production equipment and membrane-preparing process are simplified, the production efficiency is improved, the membrane is continuously rolled, the membrane has a high molecular interpenetratingnetwork structure, the ion exchange group on the surface and interior of the whole membrane is relatively uniform, the membrane resistance is low, the strength is high, the size stability is good, and the comprehensive performance is close to the homogeneous phase ion exchange membrane.

Description

technical field [0001] The invention relates to the technical field of anion-exchange membrane preparation, in particular to a method for preparing a semi-homogeneous anion-phase ion-exchange membrane. Background technique [0002] Ion exchange membrane has unique ion exchange characteristics, which makes it play an increasingly important role in clean production, environmental protection, energy conversion, etc. The need for pollution control is also widely used in seawater desalination and other fields, and has become an important part of the sustainable economic development strategy. [0003] Chinese patent 201510347434.6 discloses a continuous production method for the production of polyvinyl chloride semi-homogeneous anion and cation exchange membranes. The method uses twin-screw extrusion to form a film, adheres mesh cloth on both sides of the film, and produces it through four-roll calendering. Rolls of polyvinyl chloride semi-homogeneous ion exchange membranes. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
CPCB01D67/0002B01D71/34B01D2325/42
Inventor 王炳辉徐守疆吴法东解四营
Owner 海丝节水科技(天津)有限公司