DIAPHRAGM MANUFACTURING METHOD AND DIAPHRAGM
A diaphragm manufacturing method includes: when a pulp slurry obtained after beating of a pulp exhibits anionic predominance, adding a fluoropolymer that is cationic into the pulp slurry to cause the fluoropolymer to be contained in the pulp; and screening and shaping the pulp slurry into a diaphragm.
1 . A diaphragm manufacturing method comprising:
when a pulp slurry obtained after beating of a pulp exhibits anionic predominance, adding a fluoropolymer that is cationic into the pulp slurry to cause the fluoropolymer to be contained in the pulp; and
screening and shaping the pulp slurry into a diaphragm.
2 . A diaphragm manufacturing method comprising:
when a pulp slurry obtained after beating of a pulp exhibits cationic predominance, adding a fluoropolymer that is anionic into the pulp slurry to cause the fluoropolymer to be contained in the pulp; and
screening and shaping the pulp slurry into the diaphragm.
3 . The diaphragm manufacturing method according to claim 2 , wherein
adding a cationic fixing agent to the pulp slurry obtained after beating of the pulp, before the adding of the fluoropolymer that is anionic.
4 . The diaphragm manufacturing method according to claim 1 , further comprising:
adding a paper strengthening agent to the pulp slurry, before the adding of the fluoropolymer that is cationic.
5 . The diaphragm manufacturing method according to claim 2 , further comprising:
adding a paper strengthening agent to the pulp slurry, after the adding of the fluoropolymer that is anionic.
6 . The diaphragm manufacturing method according to claim 1 , further comprising:
adding, to the pulp slurry, at least one of: long fiber pulp; recycled cotton fiber and recycled synthetic fiber that are hard resin coated; glass fiber; acrylic fiber; polyolefin fiber; polyester fiber; aramid fiber; or liquid-crystal polymer fiber.
7 . The diaphragm manufacturing method according to claim 2 , further comprising:
adding, to the pulp slurry, at least one of: long fiber pulp; recycled cotton fiber and recycled synthetic fiber that are hard resin coated; glass fiber; acrylic fiber; polyolefin fiber; polyester fiber; aramid fiber; or liquid-crystal polymer fiber.
8 . The diaphragm manufacturing method according to claim 1 , wherein
the diaphragm obtained after the screening and shaping of the pulp slurry is not impregnated with water repellent.
9 . The diaphragm manufacturing method according to claim 2 , wherein
the diaphragm obtained after the screening and shaping of the pulp slurry is not impregnated with water repellent.
10 . The diaphragm manufacturing method according to claim 1 , further comprising:
adding a sizing agent to the pulp slurry.
11 . The diaphragm manufacturing method according to claim 2 , further comprising:
adding a sizing agent to the pulp slurry.
12 . The diaphragm manufacturing method according to claim 1 , wherein
the fluoropolymer that is cationic includes a perfluoroalkyl terminal including at least 1 and at most 6 carbon atoms.
13 . The diaphragm manufacturing method according to claim 2 , wherein
the fluoropolymer that is anionic includes a perfluoroalkyl terminal including at least 1 and at most 6 carbon atoms.
14 . The diaphragm manufacturing method according to claim 12 , wherein
the fluoropolymer that is cationic is an acrylic resin having a nitrogen-containing cationic group.
15 . The diaphragm manufacturing method according to claim 13 , wherein
the fluoropolymer that is anionic is an acrylic resin having an anionic group.
16 . A diaphragm comprising:
a pulp in which an acrylic resin is contained, the acrylic resin including a perfluoroalkyl terminal including at least 1 and at most 6 carbon atoms.