Cation-exchange membrane, electrolyzer, and method for producing cation-exchange membrane
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsKenji Nakagawa, Masatsugu Morishita, Hideaki Kurita
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Abstract
A cation-exchange membrane includes layer (I) containing repeating units (A) each represented by formula (1) and repeating units (S) each containing a sulfonic acid-type ion-exchange group, wherein the mass proportion of repeating units (A) based on the total mass proportion of repeating units (A) and repeating units (S) being 100% by mass is 53% by mass or more and 70% by mass or less; and layer (II) containing a fluorine-containing polymer containing a carboxylic acid-type ion-exchange group and disposed on layer (I), wherein the water content of layer (I) is 26% or more and 35% or less: CF2—CF2 (1)
Claims17
A cation-exchange membrane comprising:
- a layer (I) comprising repeating units (A) each represented by formula (1) and repeating units (S) each containing a sulfonic acid-type ion-exchange group;
- and
- a layer (II) comprising a fluorine-containing polymer comprising a carboxylic acid-type ion-exchange group and disposed on the layer (I),
- wherein
- the repeating units (S) comprises repeating units (C) each represented by formula (3) and repeating units (D) each represented by formula (4), and
- a water content of layer (I) is 25% 25 wt. % or more and 35% 35 wt. % or less:
- wherein,
- in formulas (3) and (4), m each independently represents an integer of 1 to 12, and M represents an alkali metal;
- and
- the layer (I) comprises a mixture of a copolymer comprising the repeating units (A) and the repeating units (C) and a copolymer comprising the repeating units (A) and the repeating units (D).
A cation-exchange membrane comprising:
- a layer (I) comprising repeating units (A) each represented by formula (1) and repeating units (S) each comprising a sulfonic acid-type ion-exchange group, wherein a mass proportion of the repeating units (A) based on a total mass proportion of the repeating units (A) and the repeating units (S) being 100% by mass is 53% by mass or more and 70% by mass or less;
- and
- a layer (II) comprising a fluorine-containing polymer comprising a carboxylic acid-type ion-exchange group and disposed on the layer (I),
- wherein a water content of the layer (I) is 26 wt. % or more and 35 wt. % or less:
- wherein
- the repeating units (S) comprises repeating units (B) each represented by formula (2):
- wherein, in formula (2), n represents an integer of 0 to 3, m represents an integer of 1 to 12, and M represents an alkali metal;
- the repeating units (B) comprises repeating units (C) each represented by formula (3) and repeating units (D) each represented by formula (4):
- wherein, in formulas (3) and (4), m and M are as defined in formula (2);
- and
- the layer (I) comprises a mixture of a copolymer comprising the repeating units (A) and the repeating units (C) and a copolymer comprising the repeating units (A) and the repeating units (D).
Dependencies are inferred from the claim text.