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Fluorine-containing polymer, cation exchange membrane, and electrolysis vessel

A cation exchange membrane, ion exchange technology, applied in cation exchange materials, electrolysis components, electrolysis process, etc., can solve the problem of reducing current efficiency and achieve the effect of stabilizing current efficiency

Active Publication Date: 2016-02-03
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an ion exchange membrane composed of at least two layers of a carboxylic acid layer and a sulfonic acid layer is used, it is known that the current efficiency decreases over time from the initial stage of electrolysis.

Method used

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  • Fluorine-containing polymer, cation exchange membrane, and electrolysis vessel
  • Fluorine-containing polymer, cation exchange membrane, and electrolysis vessel
  • Fluorine-containing polymer, cation exchange membrane, and electrolysis vessel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] (Production of fluorine-containing polymers)

[0153] Solution polymerization was performed in order to obtain a carboxylic acid type fluorine-containing polymer. As the stirring blade, an anchor type stirring blade was used. First, add CF to a stainless steel 20L autoclave 2 = CFOCF 2 CF(CF 3 )O(CF 2 ) 2 COOCH 3 5160g, HFC-43-10mee15633g, after fully replacing the container with nitrogen, further use CF 2 = CF 2 (TFE) to replace, heated until the temperature inside the container became stable at 35°C, and pressurized to 0.232 MPa-G (gauge pressure) with TFE. Next, (CF 3 CF 2 CF 2 COO) 2 5% HFC43-10mee solution 103g, methanol 2.04g as chain transfer agent, start the reaction. TFE was fed intermittently while stirring at 35°C, and 1.86 g of methanol was added on the way to lower the TFE pressure from 0.232 MPa-G at the initial stage to 0.206 MPa-G at the end, and the polymerization was stopped when 688 g of TFE was supplied. After discharging the unreacted ...

Embodiment 2

[0166] In order to produce a fluorine-containing polymer having a different melt index a, in Example 1, the amount of methanol added initially was changed to 0.22 g, and the amount of methanol added midway was changed to 0.20 g, and the procedure was carried out in the same manner as in Example 1. Polymerization to obtain a carboxylic acid type fluorine-containing polymer. The obtained fluorine-containing polymer was pelletized with a twin-screw extruder. The EW of the fluorine-containing polymer was 1122 g / eq.

[0167] The melt index a of the carboxylic acid type fluorine-containing polymer was 4.35 (g / 10 minutes), and the melt index b was 1.80 (g / 10 minutes). In addition, using a and b to calculate c, the result is 0.26, c≤0.027×a+0.19. The result of plotting the vertical axis c and the horizontal axis a is shown in figure 2 .

[0168] A cation exchange membrane was produced in the same manner as in Example 1 except that the above-mentioned carboxylic acid type fluorine...

Embodiment 3

[0172] In order to produce a fluorine-containing polymer having a different melt index a, in Example 1, the amount of methanol added initially was changed to 1.62 g, and the amount of methanol added midway was changed to 1.47 g, and the procedure was carried out in the same manner as in Example 1. Polymerization to obtain a carboxylic acid type fluorine-containing polymer. The obtained fluorine-containing polymer was pelletized with a twin-screw extruder. The EW of the fluorine-containing polymer was 1119 g / eq.

[0173] The melt index a of the carboxylic acid type fluorine-containing polymer was 27.56 (g / 10 minutes), and the melt index b was 19.07 (g / 10 minutes). In addition, using a and b to calculate c, the result is 0.85, c≤0.027×a+0.19. The result of plotting the vertical axis c and the horizontal axis a is shown in figure 2 .

[0174] A cation exchange membrane was produced in the same manner as in Example 1 except that the above-mentioned carboxylic acid type fluori...

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Abstract

The present invention relates to a cation exchange membrane including a fluorine-containing polymer which includes tetrafluoroethylene units, and perfluoroethylene units having carboxylic acid ion exchange groups. The melt index (a) of the fluorine-containing polymer obtained by methyl esterifying the carboxylic acid ion exchange groups, said melt index (a) being measured under conditions in which the temperature is 270 not C, the load is 2.16 kg, and the orifice internal diameter is 2.09 mm, is 3-50 g / 10 min. Furthermore, the melt index (a), and the melt index (b) of the fluorine-containing polymer obtained by methyl esterifying the carboxylic acid ion exchange groups, said melt index (b) being measured under conditions in which the temperature is 260 not C, the load is 2.16 kg, and the orifice internal diameter is 2.09 mm, satisfy the relationship represented by formula (1), namely (a-b) / (270-260) <= 0.027a +0.19.

Description

technical field [0001] The present invention relates to a fluorine-containing polymer, a cation exchange membrane, and an electrolytic cell using the cation exchange membrane. Background technique [0002] Fluorine-containing ion exchange membranes are excellent in heat resistance and chemical resistance, so they are used as separators for ozone generation, including cation exchange membranes for electrolysis used to produce chlorine and alkali by electrolysis of alkali metal chlorides; Separators for various electrolysis applications such as fuel cells, water electrolysis, and hydrochloric acid electrolysis. Among them, there are the following requirements in the electrolysis of alkali metal chlorides: high current efficiency is required from the aspect of productivity; low electrolysis voltage is required from the aspect of economy; low salt concentration. [0003] Among these requirements, in order to exhibit high current efficiency, an ion-exchange membrane consisting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C08F8/14C08F214/18C08J5/22C25B1/46C25B9/00C25B9/19
CPCC08F8/14C25B1/46C25B9/00C08F214/262C08J5/2237C08J2327/12C25B13/08B01J39/20C25B9/19C08F214/26C08F216/1408
Inventor 贝原慎一米泽正昭小永吉优品田知宏
Owner ASAHI KASEI KK
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