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A continuous preparation method of high-density polystyrene-based 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 equipment, high technical requirements, high resistance, long production cycle, etc., to reduce adverse effects, shorten the process process, the effect of improving production efficiency

Active Publication Date: 2021-04-16
海丝节水科技(天津)有限公司
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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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  • A continuous preparation method of high-density polystyrene-based 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-based cation exchange membrane. After uniformly mixing styrene, a crosslinking agent, an initiator and a solvent, it is used to dissolve polyvinylidene fluoride to obtain a homogeneous mixed solution , and then thermally initiate polymerization to obtain a jelly with an interpenetrating network structure, which is extruded and granulated to obtain polystyrene / polyvinylidene fluoride white ball particles, and then prepares a cation exchange resin by referring to the functionalization method of a cation exchange resin Granules are mixed with compound cross-linking agent, twin-screw extruded film, and then enter into four-roller calendering unit to calender into prefabricated film, then cover the net and enter into flat-belt drum vulcanizer for hot pressing to obtain high-density polystyrene-based cation exchange membrane. The cation exchange membrane prepared by the present invention has an interpenetrating network structure, which eliminates the defects of the microscopic phase separation structure. After the secondary crosslinking reaction, the compactness of the membrane is further improved, and the concentration capacity and surface resistance are equal to those of the homogeneous cation exchange membrane. 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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Patent Type & Authority Patents(China)
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 海丝节水科技(天津)有限公司
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