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Method for preparing perfluorinated sulfonic acid ionic membrane by melting-extruding-flattening film

A technology of perfluorosulfonic acid ion and perfluorosulfonic acid, which is applied in the fields of semi-permeable membrane separation, chemical instruments and methods, and membrane technology, and can solve the problems of easy discoloration of products, long process, low efficiency, etc.

Inactive Publication Date: 2007-07-04
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the film formation of these methods, the solvent in the film must be volatilized, so the process of film forming and desolventization is long, the efficiency is low, and the product is easy to change color. In addition, it is difficult to obtain a film with uniform thickness due to solution casting.

Method used

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  • Method for preparing perfluorinated sulfonic acid ionic membrane by melting-extruding-flattening film
  • Method for preparing perfluorinated sulfonic acid ionic membrane by melting-extruding-flattening film
  • Method for preparing perfluorinated sulfonic acid ionic membrane by melting-extruding-flattening film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Raw materials used: the group form is Rf-SO 2 F perfluorosulfonic acid fluororesin, density 1.98g / cm 3 , granular raw materials, the extruder is a single-screw extruder Φ30, L / D=25; the slit thickness of the sheet mold is adjustable at 1.0mm, and the slit width is 150mm; after extruding the film, it enters the three-roll calender for calendering and cooling Rewinding; Among them, the steel materials used for the extruder screw, barrel and slit die are all special stainless steel. The temperature of each section of the extruder is 140-190°C, of ​​which the die temperature is 175°C; the roll temperature of the three-roll calender is ≤30°C. After the equipment is heated to the set temperature, the resin is added through the feeding port of the extruder, and the extruded film is melted and plasticized, and then calendered and cooled by a three-roll calender to obtain an apparent free-standing film with a thickness of 120±5μm and a width of 140mm. Defective perf...

Embodiment 2

[0017] Embodiment 2: using raw materials: the group form is Rf-SO 2 F perfluorosulfonic acid fluororesin, density 1.98g / cm 3 , granular raw materials, the extruder is a single-screw extruder Φ65, L / D=25; the slit of the sheet mold is adjustable at 1.0mm, and the slit width is 300mm; after extruding the film, it enters the three-roll calender for calendering and cooling Winding; Among them, the steel materials used for the extruder screw, barrel and die are all special stainless steel. The temperature of each section of the extruder is 140-205°C, of ​​which the die temperature is 185°C; the roll temperature of the three-roll calender is about 30°C. The resulting film thickness is 155 μm and the width is 260 mm, which is an apparently defect-free perfluorosulfonic acid fluorine ion membrane.

[0018] The membrane was saponified by NaOH methanol solution for 16 hours, and then reacted with HCl solution to obtain sodium perfluorosulfonate and hydrogen perfluorosulfonate ion exch...

Embodiment 3

[0019] Embodiment three: using raw materials: the group form is Rf-SO 2 F perfluorosulfonic acid fluororesin, density 1.98g / cm 3 , granular raw material, the extruder is a twin-screw extruder Φ20, L / D=40; the slit of the sheet die is 1.0mm, and the width is 150mm; after extruding the film, it enters the three-roller calender for calendering and cooling before winding; Among them, the steel materials used for extruder screw, barrel and slit die are all special stainless steel. The temperature of each section of the extruder is 140-185°C, of ​​which the die temperature is 185°C; the roll temperature of the three-roll calender is about 30°C. After the equipment is heated to the set temperature, the resin is metered and fed into the twin-screw extruder through the screw feeder, extruded to form a film, and an apparently defect-free perfluorosulfonic acid fluorine type with a thickness of 140 μm and a width of 140 mm is obtained. ionic membrane.

[0020] The membrane was saponif...

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Abstract

The invention discloses a method for preparing perfluorosulfonic acid ion-exchange membrane. The melting extrusion calendaring method is to improve the performance of membrane and increase its production rate. The method comprises following steps: putting perfluorosulfonic acid resin to extrusion machine for melting and extrusion, getting sheet membrane through lamel die head forming, calendaring with three- roll calendar, or compositing with polytetrafluoroethylene net cloth on three- roll calendar directly to produce perfluorosulfonic acid ion-exchange membrane or composite membrane, then forming ionic or acid kind through chemical treatment. The thickness uniformity of membrane is adjusted by thickness moderation screw on slit die, and membrane thickness is controlled by extrusion speed of extrusion machine and drawing velocity of three- roll calendar. The membrane produced with perfluorosulfonic acid resin can be converted into perfluorosulfonic acid ion membrane, and the exchange capacity of membrane IEC is 0.67- 1.5 mmol / g.

Description

technical field [0001] The invention relates to a processing and forming method of a perfluorosulfonic acid ion exchange membrane. Specifically, the present invention relates to a method for preparing a perfluorosulfonic acid ion-exchange membrane used as a diaphragm for electrolysis of water, acid, and salt solution and a battery diaphragm. In this method, the perfluorosulfonic acid fluororesin is extruded through a sheet head in a molten and plasticized state through a screw extruder, and then processed into a film product through three-roll calendering, or through a three-roll calender and base Material composites can be directly made into cloth-based composites. The uniformity of the film is adjusted by adjusting the opening thickness of the sheet die, and the thickness of the film is controlled by adjusting the extrusion speed of the extruder and the speed of the three-roll calender. The obtained film is then chemically treated to realize group conversion, and finally a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22B29C69/02B01D71/66C25B13/08H01M4/94H01M2/16H01M50/403H01M50/426
CPCY02E60/50
Inventor 苑会林刘宁王凤霞赵小英陶欣
Owner BEIJING UNIV OF CHEM TECH
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