Continuous preparation method of polystyrene/polyvinylidene fluoride ion exchange membrane

A polyvinylidene fluoride, ion exchange membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of resin particles needing a crushing step, prolonging production time, poor compatibility of ion exchange resins, etc. , to achieve the effect of uniform and continuous microstructure, shorten the process flow, and reduce adverse effects

Inactive Publication Date: 2019-02-01
绿邦膜分离技术(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the ion exchange resin obtained by this polymerization method, it is still difficult to guarantee the homogeneity of the monomer solution in the polyvinylidene fluoride solution with high viscosity, and the slow addition of the monomer solution prolongs the production time, and the resin particles need to be pulverized, increasing the production time. shorten the production cycle and reduce production efficiency
Moreover, when the functionalization reaction is carried out in industrial production to prepare anion resin, the powdered polymer is easy to block the net when cleaning after functionalization, which is time-consuming and energy-consuming.
In addition, the softener polyisobutylene has a large molecular weight, low polarity, poor compatibility with polar ion exchange resins, and is prone to phase separation structure
These processes are all batch-type, and the obtained ion-exchange membranes cannot be produced continuously and rolled, and the efficiency is low.

Method used

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  • Continuous preparation method of polystyrene/polyvinylidene fluoride ion exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A continuous preparation method of polystyrene / polyvinylidene fluoride cation exchange membrane, comprising the following steps:

[0023] (1) At room temperature, add styrene, crosslinking agent divinylbenzene, initiator dibenzoyl peroxide and solvent N,N-dimethylformamide (2 times the quality of polyvinylidene fluoride) into the reactor, After stirring evenly, add polyvinylidene fluoride, and stir at 65°C until it dissolves into a homogeneous transparent styrene / polyvinylidene fluoride mixed solution, wherein the mass ratio of styrene to polyvinylidene fluoride is 1.0, and the mass of the crosslinking agent is 1% of the mass of styrene. 8%, the initiator mass is 1.5% of the styrene mass.

[0024] (2) The mixed solution initiates polymerization at 80°C for 8 to 20 hours to obtain polystyrene / polyvinylidene fluoride jelly; extrude the jelly, precipitate and solidify, granulate, and dry to obtain polystyrene / polyvinylidene fluoride Ethylene white ball particles;

[0025...

Embodiment 2

[0028] A continuous preparation method of polystyrene / polyvinylidene fluoride cation exchange membrane, comprising the following steps:

[0029] (1) At room temperature, add styrene, crosslinking agent divinylbenzene, initiator azobisisobutyronitrile and solvent N,N-dimethylacetamide (4 times the mass of polyvinylidene fluoride) into the reactor, After stirring evenly, add polyvinylidene fluoride, and stir at 65°C until it dissolves into a homogeneous transparent styrene / polyvinylidene fluoride mixed solution, wherein the mass ratio of styrene to polyvinylidene fluoride is 0.8, and the mass of the crosslinking agent is 1% of the mass of styrene. 8%, the initiator mass is 2.0% of the styrene mass.

[0030] (2) The mixed solution initiates polymerization at 85°C for 8-20 hours to obtain polystyrene / polyvinylidene fluoride jelly; extrude the jelly, precipitate and solidify, granulate, and dry to obtain polystyrene / polyvinylidene fluoride Ethylene white ball particles;

[0031] ...

Embodiment 3

[0034] A continuous preparation method of polystyrene / polyvinylidene fluoride cation exchange membrane, comprising the following steps:

[0035] (1) At room temperature, mix styrene, crosslinking agent ethylene glycol dimethacrylate, initiator dibenzoyl peroxide and solvent N,N-dimethylformamide (6 times the quality of polyvinylidene fluoride) Add it into the reaction kettle, stir evenly, add polyvinylidene fluoride, stir at 70°C until it dissolves into a homogeneous transparent styrene / polyvinylidene fluoride mixed solution, wherein the mass ratio of styrene to polyvinylidene fluoride is 1.0, and the mass of crosslinking agent It is 10% of the mass of styrene, and the mass of the initiator is 3.0% of the mass of styrene.

[0036] (2) The mixed solution initiates polymerization at 90°C for 8-20 hours to obtain polystyrene / polyvinylidene fluoride jelly; extrude the jelly, precipitate and solidify, then granulate and dry to obtain polystyrene / polyvinylidene fluoride Ethylene wh...

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Abstract

The invention discloses a continuous preparation method of a polystyrene/polyvinylidene fluoride ion exchange membrane. The method includes: mixing styrene, a cross-linking agent, an initiator and a solvent evenly, and then dissolving polyvinylidene fluoride with the obtained mixture to obtain a homogeneous mixed solution, and then conducting thermally initiated polymerization to obtain a jelly with an interpenetrating network structure, and carrying out extrusion and granulation to obtain polystyrene/polyvinylidene fluoride white sphere particles, then utilizing the functionalization method of anion-cation exchange resin to prepare anion-cation exchange resin particles, then performing twin-screw extrusion into a membrane sheet, then sending the membrane sheet into a four-roll calendar for rolling into a membrane, then coating the membrane with mesh cloths and performing hot-pressing in a flat belt drum-type vulcanizing machine, thus obtaining the ion exchange membrane. The polystyrene/polyvinylidene fluoride ion exchange membrane prepared by the method provided by the invention has an interpenetrating network structure, eliminates the defects of micro-phase separation structure,greatly reduces the membrane resistance to a level equal to that of a homogeneous ion exchange membrane, and can realize industrial continuous production.

Description

technical field [0001] The invention relates to the technical field of preparation of functional polymer membranes, in particular to a continuous preparation method of polystyrene / polyvinylidene fluoride ion exchange membranes. Background technique [0002] Due to the unique ion exchange function of ion exchange membranes, anion and cation exchange membranes prepared on the basis of various anion and cation exchange resins have been widely used in industrial fields such as acid and alkali recovery, wastewater treatment, and desalination separation. Ion exchange membranes can be divided into heterogeneous membranes, semi-homogeneous membranes and homogeneous membranes structurally. At present, commercial ion exchange membranes on the market are mostly heterogeneous membranes with general electrochemical performance, and are mostly used in the primary electrodialysis process. The heterogeneous film adopts the direct hot pressing molding process, which is formed by mixing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/28B01D67/00
CPCB01D67/0002B01D71/28B01D71/34
Inventor 杨文龙王炳辉吴法东徐守疆
Owner 绿邦膜分离技术(江苏)有限公司
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