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Continuous preparation method of high-density polystyrene cation exchange membrane

A cation exchange membrane, polystyrene technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of high resistance, long production cycle, equipment and technical requirements, shorten the process flow, improve production efficiency , the effect of reducing adverse effects

Active Publication Date: 2019-02-12
绿邦膜分离技术(江苏)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has a long preparation process, long production cycle, high equipment and technical requirements, and high resistance of the film (25~28Ω·cm 2 )

Method used

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  • Continuous preparation method of high-density polystyrene cation exchange membrane

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Effect test

Embodiment 1

[0025] A method for continuously preparing high-density polystyrene-based cation-exchange membranes, comprising the following steps:

[0026] (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.

[0027](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;

[0028] (3...

Embodiment 2

[0031] A method for continuously preparing high-density polystyrene-based cation-exchange membranes, comprising the following steps:

[0032] (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. 10%, the initiator mass is 2.0% of the styrene mass.

[0033] (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;

[0034] (3...

Embodiment 3

[0037] A method for continuously preparing high-density polystyrene-based cation-exchange membranes, comprising the following steps:

[0038] (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 11% of the mass of styrene, and the mass of the initiator is 3.0% of the mass of styrene.

[0039] (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 white...

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Abstract

The invention discloses a continuous preparation method of a high-density polystyrene cation exchange membrane. The method comprises the steps of evenly mixing styrene, a crosslinking agent, an initiator and a solvent for dissolving polyvinylidene fluoride to obtain a homogeneous mixed solution, and then thermally initiating the polymerization to obtain jelly having an interpenetrating network structure; extruding and granulating to obtain polystyrene / polyvinylidene fluoride white ball granules, and then preparing cation exchange resin granules by using functionalization of cation exchange resin as reference; mixing the prepared cation exchange resin granules with a composite crosslinking agent, and extruding into a membrane piece by using a twin-screw extruder; enabling the product to enter a four-roll calendering unit for calendering into a pre-formed film, covering with a net and then enabling the product to enter a flat belt drum type vulcanizer for hot-pressing so as to obtain thehigh-density polystyrene cation exchange membrane. The cation exchange membrane prepared by the method has the interpenetrating network structure, thus eliminating the microscopic phase separation structural defect; the compactness density of the membrane is further improved after a secondary crosslinking reaction is carried out; the concentration ability and surface resistance of the high-density polystyrene cation exchange membrane are the same as those of a homogeneous cation exchange membrane, and industrialized continuous production can be realized.

Description

technical field [0001] The invention relates to the technical field of preparation of functional polymer membranes, in particular to a continuous preparation method for high-density polystyrene-based cation 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 i...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00
CPCB01D67/002B01D69/02B01D71/34B01D2325/42
Inventor 王炳辉杨文龙吴法东徐守疆
Owner 绿邦膜分离技术(江苏)有限公司
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