WO2023286640A1 - 含フッ素ポリマーの製造方法 - Google Patents
含フッ素ポリマーの製造方法 Download PDFInfo
- Publication number
- WO2023286640A1 WO2023286640A1 PCT/JP2022/026475 JP2022026475W WO2023286640A1 WO 2023286640 A1 WO2023286640 A1 WO 2023286640A1 JP 2022026475 W JP2022026475 W JP 2022026475W WO 2023286640 A1 WO2023286640 A1 WO 2023286640A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluoropolymer
- fluorine
- polymerization
- producing
- reaction mixture
- Prior art date
Links
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 81
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000011737 fluorine Substances 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 229920000642 polymer Polymers 0.000 title abstract description 44
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 138
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 46
- 239000011541 reaction mixture Substances 0.000 claims abstract description 44
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000178 monomer Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 239000002904 solvent Substances 0.000 claims abstract description 25
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 20
- 238000010557 suspension polymerization reaction Methods 0.000 claims abstract description 20
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 18
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 18
- 239000010452 phosphate Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000002798 polar solvent Substances 0.000 claims abstract description 7
- 230000000379 polymerizing effect Effects 0.000 claims abstract description 7
- 229920002313 fluoropolymer Polymers 0.000 claims description 80
- 239000004811 fluoropolymer Substances 0.000 claims description 80
- 239000011734 sodium Substances 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 14
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 14
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 14
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 14
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 10
- 235000011180 diphosphates Nutrition 0.000 claims description 5
- 229940048084 pyrophosphate Drugs 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- XPPKVPWEQAFLFU-UHFFFAOYSA-J diphosphate(4-) Chemical compound [O-]P([O-])(=O)OP([O-])([O-])=O XPPKVPWEQAFLFU-UHFFFAOYSA-J 0.000 claims 1
- 239000010408 film Substances 0.000 description 38
- 238000003756 stirring Methods 0.000 description 29
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 22
- 229920001577 copolymer Polymers 0.000 description 19
- 235000011007 phosphoric acid Nutrition 0.000 description 18
- 235000021317 phosphate Nutrition 0.000 description 15
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 12
- 238000005406 washing Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 6
- 239000005977 Ethylene Substances 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 6
- 239000003381 stabilizer Substances 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- -1 chlorotrifluoroethylene, ethylene Chemical group 0.000 description 5
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 238000004581 coalescence Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000003505 polymerization initiator Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003125 aqueous solvent Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
- 150000001451 organic peroxides Chemical class 0.000 description 3
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- YPVDWEHVCUBACK-UHFFFAOYSA-N propoxycarbonyloxy propyl carbonate Chemical compound CCCOC(=O)OOC(=O)OCCC YPVDWEHVCUBACK-UHFFFAOYSA-N 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- GVEUEBXMTMZVSD-UHFFFAOYSA-N 3,3,4,4,5,5,6,6,6-nonafluorohex-1-ene Chemical group FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C=C GVEUEBXMTMZVSD-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 description 2
- 235000019407 octafluorocyclobutane Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 150000003016 phosphoric acids Chemical class 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- KDGNCLDCOVTOCS-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy propan-2-yl carbonate Chemical compound CC(C)OC(=O)OOC(C)(C)C KDGNCLDCOVTOCS-UHFFFAOYSA-N 0.000 description 1
- NOBYOEQUFMGXBP-UHFFFAOYSA-N (4-tert-butylcyclohexyl) (4-tert-butylcyclohexyl)oxycarbonyloxy carbonate Chemical compound C1CC(C(C)(C)C)CCC1OC(=O)OOC(=O)OC1CCC(C(C)(C)C)CC1 NOBYOEQUFMGXBP-UHFFFAOYSA-N 0.000 description 1
- KHXKESCWFMPTFT-UHFFFAOYSA-N 1,1,1,2,2,3,3-heptafluoro-3-(1,2,2-trifluoroethenoxy)propane Chemical compound FC(F)=C(F)OC(F)(F)C(F)(F)C(F)(F)F KHXKESCWFMPTFT-UHFFFAOYSA-N 0.000 description 1
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229920000805 Polyaspartic acid Polymers 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002998 adhesive polymer Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 238000012662 bulk polymerization Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000007810 chemical reaction solvent Substances 0.000 description 1
- UUAGAQFQZIEFAH-UHFFFAOYSA-N chlorotrifluoroethylene Chemical group FC(F)=C(F)Cl UUAGAQFQZIEFAH-UHFFFAOYSA-N 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 108010064470 polyaspartate Proteins 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229940005657 pyrophosphoric acid Drugs 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
- C08F214/262—Tetrafluoroethene with fluorinated vinyl ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F14/18—Monomers containing fluorine
- C08F14/26—Tetrafluoroethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/002—Scale prevention in a polymerisation reactor or its auxiliary parts
- C08F2/004—Scale prevention in a polymerisation reactor or its auxiliary parts by a prior coating on the reactor walls
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/18—Suspension polymerisation
Definitions
- the present disclosure relates to a method for producing a fluoropolymer.
- a fluorine-containing polymer is produced by polymerizing a fluorine-containing monomer (optionally together with a fluorine-free monomer).
- Polymerization methods for producing fluoropolymers include emulsion polymerization, suspension polymerization, solution polymerization, and bulk polymerization.
- Suspension polymerization has a problem that the produced polymer adheres to the inner surface of the polymerization tank (more specifically, including the inner wall surface and the surfaces of stirring blades, baffles, etc., if present).
- the inner surface of the polymerization vessel is treated with an aqueous solution of phosphoric acid and/or a phosphate. It is known that it is possible to prevent the generated polymer from adhering to the surface (see Patent Documents 2 and 3). More specifically, for example, in Patent Document 2, such treatment involves filling a polymerization tank with an aqueous solution of phosphoric acid or a phosphate, leaving it for about 1 hour, draining the aqueous solution, and then removing phosphate ions with pure water.
- An object of the present disclosure is to provide a novel method for producing a fluoropolymer, which can simply and effectively prevent the adhesion of the fluoropolymer to the polymerization tank.
- a method for producing a fluoropolymer comprising: (a) treating at least a region of the metal inner surface of the polymerization vessel that can come into contact with the reaction mixture during (b) below with a treating agent containing phosphoric acid and/or a phosphate and a polar solvent; (b) in the polymerization tank, polymerizing at least a fluorine-containing monomer by suspension polymerization in a reaction mixture containing a fluorine-containing solvent and water; A manufacturing method comprising obtaining a fluoropolymer.
- the present inventors have analyzed and evaluated coatings (anti-adhesion coatings) formed from treatment agents containing phosphoric acid and/or phosphates, and have conducted further intensive research, leading to the completion of the present disclosure.
- coatings anti-adhesion coatings formed from treatment agents containing phosphoric acid and/or phosphates.
- a method for producing a fluoropolymer according to one embodiment of the present disclosure will be described in detail.
- the method for producing a fluoropolymer comprises (a) Treating a predetermined area of the metallic inner surface of the polymerization vessel with a treatment agent containing phosphoric acid and/or a phosphate and a polar solvent to form an anti-adhesion coating (herein simply referred to as "coating and (b) polymerizing at least the fluoromonomer in the reaction mixture by suspension polymerization in the polymerization tank to obtain a fluoropolymer.
- a treatment agent containing phosphoric acid and/or a phosphate and a polar solvent to form an anti-adhesion coating
- Step (a) First, before the polymerization in step (b), the inner surface of the polymerization tank is treated with a treating agent.
- the polymerization tank is not particularly limited as long as it has a metallic inner surface. More specifically, at least the inner wall surface (including the inner surface of the side wall, the inner surface of the bottom portion, and the inner surface of the top plate (lid)) of the polymerization vessel may be made of metal.
- the polymerization tank may optionally contain stirring blades and/or baffles (baffles), etc., and the surfaces of these may be made of metal.
- a polymerization vessel having a metal inner surface has higher pressure resistance than the case where the inner wall surface is glass-lined as described in the background art of Patent Document 1.
- the metal forming the inner surface of the polymerization vessel may be one or more of any metals, for example, at least one selected from the group consisting of stainless steel, nickel alloy steel and carbon steel.
- a predetermined area of the metal inner surface of the polymerization tank is treated with a treatment agent.
- the predetermined area may include at least the area that can come into contact with the reaction mixture during step (b), and preferably substantially all of the metallic inner surface.
- the treatment agent is a liquid substance containing phosphoric acid and/or a phosphate and a polar solvent.
- Phosphoric acid and/or phosphate is a group consisting of phosphoric acids such as orthophosphoric acid, metaphosphoric acid, pyrophosphoric acid, and salts of such phosphoric acids with metals (e.g., sodium, potassium, magnesium, calcium, zinc, manganese, etc.) can be at least one selected from
- the phosphoric acid and/or phosphate may be, for example, a metal pyrophosphate, typically sodium metal pyrophosphate.
- the polar solvent can be any solvent as long as it can dissolve phosphoric acid and/or phosphate, and is usually an aqueous solvent.
- the aqueous solvent may be composed of water and optionally a water-miscible liquid substance such as an alcohol, preferably water.
- the treatment agent can be an aqueous solution in which phosphoric acid and/or a phosphate are dissolved in an aqueous solvent.
- the treating agent can be, for example, an aqueous solution of a metal pyrophosphate, typically an aqueous solution of sodium pyrophosphate.
- the concentration of phosphoric acid and/or phosphate in the treatment agent can be selected according to specific treatment conditions and/or production conditions of the fluoropolymer.
- the concentration of phosphoric acid and/or phosphate in the treatment agent may be, for example, 0.1% by mass or more and 15% by mass or less, preferably 1% by mass or more and/or 10% by mass or less.
- the treatment agent may contain phosphoric acid and/or phosphates and polar solvents, as well as any other suitable ingredients at relatively low concentrations.
- the treatment method for treating the inner surface of the polymerization tank with the treatment agent can be to bring the treatment agent into contact with the inner surface of the polymerization tank (more specifically, the predetermined region above) for a predetermined contact time.
- the contact time can be, for example, 3 hours or more, preferably 10 hours or more, if it is the first time.
- the temperature during contact is not particularly limited, but may be, for example, 80° C. or higher and 100° C. or lower.
- the remaining portion of the treatment agent (excluding the portion used for forming the film) is withdrawn from the polymerization tank and recovered.
- the treating agent is jetted onto the inner surface of the polymerization vessel for a predetermined contact time, during/after which the rest of the treating agent (excluding the portion used to form the coating) is may be withdrawn from the polymerization tank and recovered.
- the above treatment method preferably includes washing the inner surface of the polymerization tank with pure water (to the extent that phosphate ions are no longer detected) after the remainder of the treatment agent is extracted from the polymerization tank.
- the above treatment method may include heating after contact with the treatment agent and/or washing.
- a film is formed on the predetermined area.
- This film is formed from a treating agent and contains P (phosphorus).
- the P content of the coating can be 1 atomic % (eg 1.0 atomic %) or more and 10 atomic % or less, preferably 3 atomic % (eg 3.0 atomic %) or more and/or 7 atomic % (eg 7.0 atomic %). 0 atomic %) or less.
- the present inventors' research has revealed that a film exhibiting the P content as described above is strong and, as will be described later, is excellent in preventing adhesion of a fluoropolymer.
- the Na content of the coating is 1 atomic % (eg, 1.0 atomic %) or more and 20 atomic % or less. preferably 5 atomic % (eg 5.0 atomic %) or more and/or 18 atomic % or less.
- the content of elements (P, Na, etc. described above) in the film is measured by X-ray photoelectron spectroscopy (XPS).
- the reaction mixture contains a fluorine-containing solvent and water.
- the fluorine-containing solvent may be any liquid substance capable of dissolving the fluorine-containing monomer.
- the fluorine-containing solvent may be the fluorine-containing monomer itself.
- a fluorine-containing solvent functions as a reaction site for polymerization.
- the polymerization reaction proceeds in a state in which the fluorine-containing solvent in which the fluorine-containing monomer is dissolved (or the fluorine-containing monomer itself) is suspended in water, or vice versa. do.
- the reaction mixture will contain the fluoropolymer produced.
- a fluorine-containing monomer is a monomer containing a fluorine atom.
- non-fluorine-containing monomers may optionally be polymerized (copolymerized) together.
- Fluorine-free monomers are monomers that do not contain fluorine atoms. The fluorine-containing monomer and optional fluorine-free monomer are selected according to the fluorine-containing polymer to be produced.
- the fluoropolymer may have, for example, a melting point of 150°C or higher and 340°C or lower. From another point of view, the fluoropolymer may be a resin.
- fluorine-containing polymers include tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene, ethylene, perfluoroalkyl vinyl ether, perfluoro(1,1,5-trihydro-1- Pentene) and at least one monomer selected from the group consisting of perfluorobutyl ethylene (however, those consisting only of ethylene are excluded because they are not fluoropolymers), and are melt processable.
- a fluorine-containing polymer is more preferable, and a tetrafluoroethylene/hexafluoropropylene copolymer [FEP], a tetrafluoroethylene/hexafluoropropylene/perfluoroalkyl vinyl ether copolymer [FEP], a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer Polymer [PFA], poly(chlorotrifluoroethylene) [PCTFE], tetrafluoroethylene/chlorotrifluoroethylene/perfluoroalkyl vinyl ether copolymer [CPT], tetrafluoroethylene/ethylene/perfluoro(1,1, 5-trihydro-1-pentene) copolymer [ETFE], tetrafluoroethylene/ethylene/perfluorobutylethylene polymer [ETFE], tetrafluoroethylene/ethylene/hexafluoropropylene/perfluoro(1,1,5
- perhalopolymers FEP, PFA, PCTFE, and CPT, which do not contain C—H bonds and have high resistance to oxidation treatment, are particularly preferred.
- melt-processable materials and may be, for example, polytetrafluoroethylene (PTFE).
- the reaction mixture may further contain a polymerization initiator and the like.
- a polymerization initiator used for suspension polymerization
- various oil-soluble organic peroxides or water-soluble persulfates generally used for radical polymerization can be appropriately used.
- Organic peroxides such as carbonates and peroxyesters, namely di(chlorofluoroacyl)peroxide, di(fluoroacyl)peroxide, di( ⁇ -hydrododecafluoroheptanoyl)peroxide, di-n-propylperoxy dicarbonate, di-i-propylperoxydicarbonate, t-butylperoxyisopropylcarbonate, bis(4-t-butylcyclohexyl)peroxydicarbonate, di-2-ethylhexylperoxydicarbonate, di-i- Butyryl peroxide and the like can be preferably used.
- di-i-propylperoxydicarbonate and di-n-propylperoxydicarbonate which are hydrocarbon-based organic peroxides, are preferable from the viewpoints of decomposition rate (half-life), frequency factor, cost, and the like. .
- the reaction mixture may or may not contain a suspension stabilizer.
- a suspension stabilizer When no suspension stabilizer is used, the purity of the finally obtained fluoropolymer is higher.
- a suspension stabilizer is used, the variation in shape and/or size of the fluoropolymer particles produced can be further reduced.
- Suspension stabilizers can be broadly classified into inorganic colloids and hydrocarbon polymers. It is preferably composed of a hydrocarbon-based polymer in that it does not leave metal behind.
- the above suspension stabilizer can be used by dissolving it in polymerization water before the initiation of polymerization.
- the hydrocarbon-based polymer include polyvinyl alcohol, methylcellulose, hydroxypropylcellulose, polyvinylpyrrolidone, and polyaspartic acid. Among them, polyvinyl alcohol or methylcellulose is preferable from the viewpoint of safety, low cost, and performance.
- the polymerization conditions for the suspension polymerization can be appropriately set according to the type and physical properties of the target fluorine-containing polymer.
- the polymerization pressure can be higher than that in conventional suspension polymerization, and is said to be the substantial upper limit pressure of a glass-lined polymerization tank, such as that described in the background art of Patent Document 1, for example. It can be carried out without any problem even under a pressure exceeding 2.0 MPa gauge pressure (hereinafter referred to as MPaG). By applying higher polymerization pressures the reaction time can be shortened.
- the above suspension polymerization may be carried out in any form such as continuous, batch, or semi-batch.
- a fluorine-containing monomer and optionally a fluorine-free monomer may be added as appropriate during the polymerization operation, and a polymerization initiator and the like may be added as appropriate.
- the fluoropolymer obtained as described above may have a particulate form.
- the average particle size of the fluoropolymer may be 10 ⁇ m or more and 2000 ⁇ m or less.
- a fluoropolymer is produced by polymerizing at least a fluoromonomer in a polymerization tank in which the coating is formed on the inner surface of the metal (more specifically, the predetermined region). Therefore, even if polymerization is carried out by suspension polymerization in a reaction mixture containing a fluorine-containing solvent and water, adhesion of the fluorine-containing polymer to the polymerization tank can be effectively prevented. After the reaction mixture is extracted from the polymerization vessel, the fluoropolymer may adhere to the polymerization vessel, but since the adhesion strength is extremely low, it can be easily removed by applying a small external force, and jet cleaning can be sufficient. can be removed. As a result, it is possible to reduce labor required for removing the fluorine-containing polymer adhering to the polymerization tank.
- the inner surface of the metal in the polymerization tank is covered with the present embodiment. If a film is not formed as described above, the fluoropolymer firmly adheres to the polymerization tank. Such a firmly adhered fluoropolymer cannot be removed by jet washing after the reaction mixture is withdrawn from the polymerization tank.
- Metal surfaces can typically be hydrophobic.
- the fluorine-containing solvent (which may be a liquid substance or the fluorine-containing monomer itself) is also usually hydrophobic, has a high affinity for the hydrophobic metal surface on which no film is formed, and wets and spreads on the metal surface. easy.
- a fluorine-containing monomer (which may be a fluorine-containing solvent) and a polymerization initiator are dissolved in such a fluorine-containing solvent, and a polymerization reaction proceeds on the metal surface to produce a fluorine-containing polymer.
- the fluoromonomer is easily polymerized on the metal surface and/or the fluoromonomer is further easily polymerized on the fluoropolymer adhering to the metal surface. It is considered that the fluorine-containing polymer adheres firmly to the surface.
- the surface of this film becomes sufficiently hydrophilic, and the effect opposite to the above works. Furthermore, it is believed that water in the reaction mixture is likely to exist and/or penetrate between the metal surface and the fluoropolymer, thereby effectively preventing adhesion of the fluoropolymer.
- step (b) withdrawing substantially all of the reaction mixture containing the fluorine-containing polymer from the polymerization tank, and then It may further comprise repeating steps (a) and (b) above.
- steps (a) and (b) may further comprise repeating steps (a) and (b) above.
- reaction mixture containing the fluoropolymer is withdrawn from the polymerization tank and transferred to subsequent steps as appropriate.
- the reaction mixture contains a fluoropolymer and water, and contains a fluorosolvent (and unreacted fluoromonomer and, if used, unreacted fluorine-free monomer, hereinafter the same) is preferably substantially free of This can be accomplished by reducing the pressure within the polymerization vessel to gasify and purge the fluorine-containing solvent from the polymerization vessel. As a result, the fluorine-containing solvent can be recovered, and the time taken to withdraw the reaction mixture from the polymerization reactor can be shortened.
- the fluorine-containing mixture "substantially does not contain" the fluorine-containing solvent means that the concentration of the fluorine-containing solvent in the fluorine-containing mixture is 0.1 mass% or less, preferably zero mass%. do.
- the contact time of the treatment agent may be shorter than the initial contact time as long as an anti-adhesion film equivalent to that of the first time can be formed.
- the contact time may be, for example, 0.5 hours or longer, preferably 1.5 hours or longer.
- the remainder of the processing agent recovered in the previous step (a) is reused as part or all of the processing agent in the next step (a). may be used.
- step (b) When step (b) is performed for the second time or later, the fluorine-containing solvent recovered in step (c) may be reused as part or all of the fluorine-containing solvent in the reaction mixture of step (b).
- the timing of performing the above step (c) and the second and subsequent steps (a) and (b) can be appropriately set according to the fluoropolymer adhesion prevention performance of the film.
- the suspension polymerization of the step (b) is carried out in a continuous manner, the operation time of the suspension polymerization, the torque (and / or power) of the stirring blade, etc.
- Subsequent steps (a) and (b) may be performed. Further, for example, when suspension polymerization is carried out in a batch or semi-batch manner, (i) each time each batch is completed, the above step (c) and the second and subsequent steps (a) and (b) are repeated.
- step (c) above is usually carried out every time each batch is completed.
- Example 1 relates to an example in which PFA (more specifically, a tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer) was produced as a fluorine-containing polymer after forming a film for the first time.
- PFA more specifically, a tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer
- the XPS measurement was performed using a PHI 5000 VersaProbe II (manufactured by ULVAC-Phi, Inc.) in a measurement area of 1 mm x 0.3 mm (maximum depth of 60 nm). The content of each element was the value at a depth of 0 nm by XPS measurement. (The same shall apply hereinafter.)
- NPP di-n-propyl peroxydicarbonate
- methanol molecular weight modifier
- elements derived from sodium pyrophosphate may be mixed in the reaction mixture extracted from the polymerization tank, they can be removed by washing the fluoropolymer.
- Example 2 relates to an example in which FEP (more specifically, tetrafluoroethylene/hexafluoropropylene copolymer) was produced as the fluorine-containing polymer after the initial film formation.
- FEP more specifically, tetrafluoroethylene/hexafluoropropylene copolymer
- Step (a) The polymerization vessel was treated with a treating agent in the same manner as in step (a) of Example 1. That is, the sodium pyrophosphate concentration of the treating agent was 5% by mass, and the contact conditions were 90° C. for 13 hours.
- DHP di( ⁇ -hydrododecafluoroheptanoyl) peroxide
- methanol a molecular weight modifier
- FEP (more specifically, tetrafluoroethylene/hexafluoropropylene copolymer) was obtained as a fluorine-containing polymer in the reaction mixture.
- FEP more specifically, tetrafluoroethylene/hexafluoropropylene copolymer
- HFP functioned as a fluorine-containing solvent
- TFE and HFP were fluorine-containing monomers.
- Example 3 In Example 3, after the second coating was formed using the polymerization tank after Example 1, PFA (more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer) was used as the fluorine-containing polymer. It relates to an example of manufacturing a coalescence).
- PFA more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer
- Example 3 in step (a), the polymerization tank after carrying out steps (a) to (c) in Example 1 was used, the sodium pyrophosphate concentration of the treating agent was 5% by mass, and the contact conditions were Steps (a) to (c) of Example 1 were carried out in the same manner, except that the temperature was 90° C. for 1.5 hours.
- step (a) of Example 3 By the treatment of step (a) of Example 3, a film was formed on the SUS inner surface of the polymerization vessel (the inner wall surface of the polymerization vessel and the surfaces of the stirring blades and baffles). XPS measurement of the obtained film revealed that the P content was 5.5 atomic % and the Na content was 15 atomic %.
- Example 4 In Example 4, the polymerization tank after Example 3 was used to form a third film, and then PFA (more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer) was used as the fluorine-containing polymer. It relates to an example of manufacturing a coalescence).
- PFA more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer
- Example 4 in step (a), the polymerization tank after carrying out steps (a) to (c) in Example 3 was used, the sodium pyrophosphate concentration of the treating agent was 3% by mass, and the contact conditions were Steps (a) to (c) of Example 1 were performed in the same manner, except that the temperature was 90° C. for 13 hours.
- Example 5 In Example 5, the polymerization tank after Example 4 was used to form the fourth film, and then PFA (more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer) was used as the fluorine-containing polymer. It relates to an example of manufacturing a coalescence).
- PFA more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer
- Example 5 in step (a), the polymerization tank after carrying out steps (a) to (c) in Example 4 was used, the sodium pyrophosphate concentration of the treating agent was 3% by mass, and the contact conditions were Steps (a) to (c) of Example 1 were carried out in the same manner, except that the temperature was 90° C. for 1.5 hours.
- Example 6 In Example 6, the polymerization tank after Example 5 was used to form the fifth film, and then PFA (more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer) was used as the fluorine-containing polymer. It relates to an example of manufacturing a coalescence).
- PFA more specifically, tetrafluoroethylene/perfluoro(propyl vinyl ether) copolymer
- Example 6 in step (a), the polymerization tank after performing steps (a) to (c) in Example 5 was used, the sodium pyrophosphate concentration of the treating agent was 1% by mass, and the contact conditions were Steps (a) to (c) of Example 1 were carried out in the same manner, except that the temperature was 90° C. for 8 hours.
- Example 7 relates to another example in which FEP (more specifically, tetrafluoroethylene/hexafluoropropylene copolymer) was produced as the fluoropolymer after the initial film formation.
- FEP more specifically, tetrafluoroethylene/hexafluoropropylene copolymer
- step (a) the sodium pyrophosphate concentration of the treating agent was set to 5% by mass and the contact conditions were set to 90° C. for 3 hours, and in step (b), pyroline was added at the same time as pure water was added.
- Steps (a) to (c) of Example 2 were carried out in the same manner, except that 2.6 g of sodium phosphate powder was charged.
- Example 8 relates to an example in which Example 1 is scaled up.
- step (a) a stainless steel autoclave with a stirrer having a volume of 139 L was used as the polymerization tank, and the processing agent in step (a) and the raw material in step (b) were changed according to the increase rate of the volume of the polymerization tank.
- Steps (a)-(c) of Example 1 were carried out similarly, except that the amount used was
- Example 8 the same results as in Example 1 were obtained with respect to the content of P and Na in the film and the adhesion of the fluorine-containing polymer.
- Example 9 relates to an example in which Example 2 is scaled up.
- step (a) a stainless steel autoclave with a stirrer having a volume of 139 L was used as the polymerization tank, and the processing agent in step (a) and the raw material in step (b) were changed according to the increase rate of the volume of the polymerization tank.
- Steps (a)-(c) of Example 2 were carried out similarly, except that the amount used was
- Example 9 the same results as in Example 2 were obtained with respect to the content of P and Na in the film and the adhesion of the fluorine-containing polymer.
- Comparative Example 1 relates to an example in which the example of Patent Document 2 (production of PTFE without using a fluorine-containing solvent) was repeated.
- the same 3-liter jacketed stirring SUS autoclave as that used in Example 1 was used. Under normal pressure, the polymerization tank was filled with an aqueous solution of sodium pyrophosphate of 64 ppm by mass as a treating agent (without spaces) and maintained at 90° C. for 1 hour while rotating the stirring blade at 150 rpm. After that, the rest of the treating agent was withdrawn from the polymerization tank and recovered. Immediately thereafter, the inner surface of the polymerization vessel was thoroughly washed with pure water.
- the method for producing a fluoropolymer of the present disclosure can be suitably used, for example, for producing fluoropolymers as various molding materials.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
含フッ素ポリマーの製造方法であって、
(a)重合槽の金属製の内表面のうち、少なくとも、下記(b)の間に反応混合物と接触し得る領域を、リン酸および/またはリン酸塩と極性溶媒とを含む処理剤で処理して、付着防止被膜を前記領域上に形成し、および
(b)前記重合槽にて、少なくとも含フッ素モノマーを、含フッ素溶媒と水とを含む反応混合物中で懸濁重合により重合させて含フッ素ポリマーを得る
ことを含む、製造方法。
前記付着防止被膜のP含有量が1原子%以上10原子%以下である、上記[1]に記載の含フッ素ポリマーの製造方法。
前記処理剤における前記リン酸および/またはリン酸塩の濃度が、0.1質量%以上15質量%以下である、上記[1]または[2]に記載の含フッ素ポリマーの製造方法。
前記処理剤が、ピロリン酸金属塩の水性溶液である、上記[1]~[3]のいずれかに記載の含フッ素ポリマーの製造方法。
前記処理剤が、ピロリン酸ナトリウムの水性溶液である、上記[4]に記載の含フッ素ポリマーの製造方法。
前記付着防止被膜のNa含有量が、1原子%以上20原子%以下である、上記[5]に記載の含フッ素ポリマーの製造方法。
前記重合槽の前記内表面を成す金属が、ステンレス鋼、ニッケル合金鋼および炭素鋼からなる群より選択される少なくとも1つである、上記[1]~[6]のいずれかに記載の含フッ素ポリマーの製造方法。
前記含フッ素ポリマーが、10μm以上2000μm以下の平均粒子サイズを有する、上記[1]~[7]のいずれかに記載の含フッ素ポリマーの製造方法。
前記(b)の後、
(c)含フッ素ポリマーを含む反応混合物の実質的に全部を前記重合槽から抜き出し、その後、
前記(a)および前記(b)を繰り返す
ことを更に含む、上記[1]~[8]のいずれかに記載の含フッ素ポリマーの製造方法。
前記(c)において、前記反応混合物が、含フッ素ポリマーと水とを含み、含フッ素溶媒を実質的に含まない、上記[9]に記載の含フッ素ポリマーの製造方法。
(a)重合槽の金属製の内表面のうち所定の領域を、リン酸および/またはリン酸塩と極性溶媒とを含む処理剤で処理して、付着防止被膜(本明細書において単に「被膜」とも言う)を上記領域上に形成し、および
(b)上記重合槽にて、少なくとも含フッ素モノマーを反応混合物中で懸濁重合により重合させて含フッ素ポリマーを得る
ことを含む。以下、各工程につき、より詳細に説明する。
まず、工程(b)の重合前に、重合槽の内表面を処理剤で処理する。
次いで、以上のようにして処理(被膜形成)した重合槽にて、少なくとも含フッ素モノマーを反応混合物中で懸濁重合により重合させて含フッ素ポリマーを得る。
(c)含フッ素ポリマーを含む反応混合物の実質的に全部を上記重合槽から抜き出し、その後、
上記工程(a)および工程(b)を繰り返す
ことを更に含んでいてよい。これにより、被膜の含フッ素ポリマー付着防止性能が低下しても、好ましくは元のレベルにまで復活させることができる。以下、各工程につき、より詳細に説明する。
含フッ素ポリマーを含む反応混合物の実質的に全部を重合槽から抜き出し、適宜、後工程へ移送する。反応混合物を重合槽から抜き出すに際して、反応混合物は、含フッ素ポリマーと水とを含み、含フッ素溶媒(ならびに未反応の含フッ素モノマーおよび使用した場合には未反応のフッ素非含有モノマー、以下同様)を実質的に含まないことが好ましい。このことは、重合槽内の圧力を低下させて、含フッ素溶媒をガス化して重合槽から排出(パージ)することにより実現され得る。これにより、含フッ素溶媒を回収することができ、重合槽からの反応混合物の抜き出し時間も短縮できる。
特段断りのない限り、上述した工程(a)および工程(b)と同様の操作を実施し得る。
実施例1は、被膜形成を初回実施後、含フッ素ポリマーとしてPFA(より詳細には、テトラフルオロエチレン/パーフルオロ(プロピルビニルエーテル)共重合体)を製造した例に関する。
重合槽として、内容量3リットルの、表面が金属である(槽内面にライニング等の処理が行われていない)ジャケット付き撹拌式SUS製オートクレーブ(SUS製攪拌翼およびSUS製バッフルを備える)を使用した。この重合槽に、常圧下にて、処理剤として5質量%のピロリン酸ナトリウム水溶液をフル(空寸なし)で満たして90℃で13時間に亘って、撹拌翼を150rpmで回転させながら維持した後、処理剤の残部(被膜の形成に利用された分を除く部分)を重合槽から抜き出して回収した。その後すみやかに、重合槽の内表面を純水で十分に(リン酸イオンが検出されなくなる程度まで)洗浄した。
次いで、以上のようにして処理(被膜形成)した重合槽に、純水0.75リットルを仕込んだ。攪拌を開始し、内部空間を窒素で充分置換した後、槽内を真空にし、パーフルオロシクロブタン670gを仕込んで、攪拌翼を450rpmで回転させた。引き続き、パーフルオロ(プロピルビニルエーテル)(以下PPVE)33gを圧入し、槽内温度を反応温度の35℃にし、テトラフルオロエチレン(以下TFE)を0.80MPaGまで圧入した。ここに、開始剤としてジノルマルプロピルパーオキシジカーボネート(以下NPP)0.8gと分子量調節剤としてメタノール69gを圧入し重合(懸濁重合)を開始した。反応中、系内の圧力を一定に保持するようTFEを逐次追加し、また同時に、TFEの追加量に応じてPPVEを0.8gずつ8回に分けて追加圧入した。4時間後、TFEとPPVEを計130g仕込んだところで反応を終了し、攪拌翼の回転を停止した。
反応終了後、モノマーをパージし、重合槽内に残った反応混合物(含フッ素ポリマーおよび水を含み、モノマー(反応溶媒/未反応モノマー)を実質的に含まない)の全てを重合槽から抜き出した。これにより得られた反応混合物から、含フッ素ポリマーを分離し、洗浄、乾燥することにより白色粉末125gを得た。
実施例2は、被膜形成を初回実施後、含フッ素ポリマーとしてFEP(より詳細には、テトラフルオロエチレン/ヘキサフルオロプロピレン共重合体)を製造した例に関する。
実施例1の工程(a)と同様にして、重合槽を処理剤で処理した。即ち、処理剤のピロリン酸ナトリウム濃度は5質量%とし、接触条件は90℃で13時間とした。
次いで、以上のようにして処理(被膜形成)した重合槽に、純水0.72リットルを仕込んだ。攪拌を開始し、内部空間を窒素で充分置換した後、槽内を真空にし、ヘキサフルオロプロピレン(以下HFP)720gを仕込んで、攪拌翼を450rpmで回転させた。槽内温度を反応温度の29℃にし、TFEを0.93MPaGまで圧入した。ここに、開始剤としてジ(ω-ハイドロドデカフルオロヘプタノイル)パーオキサイド(以下DHP)9.0gと分子量調節剤としてメタノール2.2gを圧入し重合(懸濁重合)を開始した。反応中、系内の圧力を一定に保持するようTFEを逐次追加した。4時間後、TFEを計124g仕込んだところで反応を終了し、攪拌翼の回転を停止した。
実施例1の工程(a)と同様にして、白色粉末90gを得た。
実施例3は、実施例1の後の重合槽を使用して、2回目の被膜形成を実施後、含フッ素ポリマーとしてPFA(より詳細には、テトラフルオロエチレン/パーフルオロ(プロピルビニルエーテル)共重合体)を製造した例に関する。
実施例4は、実施例3の後の重合槽を使用して、3回目の被膜形成を実施後、含フッ素ポリマーとしてPFA(より詳細には、テトラフルオロエチレン/パーフルオロ(プロピルビニルエーテル)共重合体)を製造した例に関する。
実施例5は、実施例4の後の重合槽を使用して、4回目の被膜形成を実施後、含フッ素ポリマーとしてPFA(より詳細には、テトラフルオロエチレン/パーフルオロ(プロピルビニルエーテル)共重合体)を製造した例に関する。
実施例6は、実施例5の後の重合槽を使用して、5回目の被膜形成を実施後、含フッ素ポリマーとしてPFA(より詳細には、テトラフルオロエチレン/パーフルオロ(プロピルビニルエーテル)共重合体)を製造した例に関する。
実施例7は、被膜形成を初回実施後、含フッ素ポリマーとしてFEP(より詳細には、テトラフルオロエチレン/ヘキサフルオロプロピレン共重合体)を製造したもう1つの例に関する。
実施例8は、実施例1をスケールアップした例に関する。
実施例9は、実施例2をスケールアップした例に関する。
比較例1は、特許文献2の実施例(含フッ素溶媒を使用しないPTFEの製造)を追試した例に関する。
比較例1と同じ条件で処理(被膜形成)した重合槽を使用したこと以外は、実施例1の工程(b)~(c)と同様にして、PFAを製造した。
比較例1と同じ条件で処理(被膜形成)した重合槽を使用したこと以外は、実施例2の工程(b)~(c)と同様にして、FEPを製造した。
Claims (10)
- 含フッ素ポリマーの製造方法であって、
(a)重合槽の金属製の内表面のうち、少なくとも、下記(b)の間に反応混合物と接触し得る領域を、リン酸および/またはリン酸塩と極性溶媒とを含む処理剤で処理して、付着防止被膜を前記領域上に形成し、および
(b)前記重合槽にて、少なくとも含フッ素モノマーを、含フッ素溶媒と水とを含む反応混合物中で懸濁重合により重合させて含フッ素ポリマーを得る
ことを含む、製造方法。 - 前記付着防止被膜のP含有量が1原子%以上10原子%以下である、請求項1に記載の含フッ素ポリマーの製造方法。
- 前記処理剤における前記リン酸および/またはリン酸塩の濃度が、0.1質量%以上15質量%以下である、請求項1または2に記載の含フッ素ポリマーの製造方法。
- 前記処理剤が、ピロリン酸金属塩の水性溶液である、請求項1~3のいずれかに記載の含フッ素ポリマーの製造方法。
- 前記処理剤が、ピロリン酸ナトリウムの水性溶液である、請求項4に記載の含フッ素ポリマーの製造方法。
- 前記付着防止被膜のNa含有量が、1原子%以上20原子%以下である、請求項5に記載の含フッ素ポリマーの製造方法。
- 前記重合槽の前記内表面を成す金属が、ステンレス鋼、ニッケル合金鋼および炭素鋼からなる群より選択される少なくとも1つである、請求項1~6のいずれかに記載の含フッ素ポリマーの製造方法。
- 前記含フッ素ポリマーが、10μm以上2000μm以下の平均粒子サイズを有する、請求項1~7のいずれかに記載の含フッ素ポリマーの製造方法。
- 前記(b)の後、
(c)含フッ素ポリマーを含む反応混合物の実質的に全部を前記重合槽から抜き出し、その後、
前記(a)および前記(b)を繰り返す
ことを更に含む、請求項1~8のいずれかに記載の含フッ素ポリマーの製造方法。 - 前記(c)において、前記反応混合物が、含フッ素ポリマーと水とを含み、含フッ素溶媒を実質的に含まない、請求項9に記載の含フッ素ポリマーの製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22841984.2A EP4365210A1 (en) | 2021-07-13 | 2022-07-01 | Method for producing fluorine-containing polymer |
CN202280049580.6A CN117651721A (zh) | 2021-07-13 | 2022-07-01 | 含氟聚合物的制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021115703A JP7208554B1 (ja) | 2021-07-13 | 2021-07-13 | 含フッ素ポリマーの製造方法 |
JP2021-115703 | 2021-07-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023286640A1 true WO2023286640A1 (ja) | 2023-01-19 |
Family
ID=84920209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/026475 WO2023286640A1 (ja) | 2021-07-13 | 2022-07-01 | 含フッ素ポリマーの製造方法 |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4365210A1 (ja) |
JP (1) | JP7208554B1 (ja) |
CN (1) | CN117651721A (ja) |
WO (1) | WO2023286640A1 (ja) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4811386A (ja) * | 1971-06-22 | 1973-02-13 | ||
JPH04261403A (ja) * | 1991-02-14 | 1992-09-17 | Kanegafuchi Chem Ind Co Ltd | 重合体スケールの付着防止方法 |
JPH06211933A (ja) * | 1993-01-19 | 1994-08-02 | Daikin Ind Ltd | 含フッ素重合体の製造方法 |
JPH06340719A (ja) * | 1993-05-28 | 1994-12-13 | Asahi Glass Co Ltd | テトラフルオロエチレン/パーフルオロアルキルビニルエーテル共重合体の製造法 |
WO2008047906A1 (fr) * | 2006-10-20 | 2008-04-24 | Daikin Industries, Ltd. | Copolymère fluoré, fil électrique et procédé de fabrication du fil électrique |
WO2009014138A1 (ja) | 2007-07-24 | 2009-01-29 | Daikin Industries, Ltd. | 精製含フッ素ポリマーの製造方法 |
JP2021115703A (ja) | 2020-01-22 | 2021-08-10 | セイコーエプソン株式会社 | 液体噴射ヘッド、液体噴射装置 |
-
2021
- 2021-07-13 JP JP2021115703A patent/JP7208554B1/ja active Active
-
2022
- 2022-07-01 CN CN202280049580.6A patent/CN117651721A/zh active Pending
- 2022-07-01 EP EP22841984.2A patent/EP4365210A1/en active Pending
- 2022-07-01 WO PCT/JP2022/026475 patent/WO2023286640A1/ja active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4811386A (ja) * | 1971-06-22 | 1973-02-13 | ||
JPH04261403A (ja) * | 1991-02-14 | 1992-09-17 | Kanegafuchi Chem Ind Co Ltd | 重合体スケールの付着防止方法 |
JPH06211933A (ja) * | 1993-01-19 | 1994-08-02 | Daikin Ind Ltd | 含フッ素重合体の製造方法 |
JPH06340719A (ja) * | 1993-05-28 | 1994-12-13 | Asahi Glass Co Ltd | テトラフルオロエチレン/パーフルオロアルキルビニルエーテル共重合体の製造法 |
WO2008047906A1 (fr) * | 2006-10-20 | 2008-04-24 | Daikin Industries, Ltd. | Copolymère fluoré, fil électrique et procédé de fabrication du fil électrique |
WO2009014138A1 (ja) | 2007-07-24 | 2009-01-29 | Daikin Industries, Ltd. | 精製含フッ素ポリマーの製造方法 |
JP2021115703A (ja) | 2020-01-22 | 2021-08-10 | セイコーエプソン株式会社 | 液体噴射ヘッド、液体噴射装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2023014407A (ja) | 2023-01-27 |
CN117651721A (zh) | 2024-03-05 |
JP7208554B1 (ja) | 2023-01-19 |
EP4365210A1 (en) | 2024-05-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6313483B2 (ja) | フッ化ビニリデン/2,3,3,3−テトラフルオロプロペンコポリマー | |
JP6201236B2 (ja) | フルオロモノマーの水性重合における核形成 | |
JP5593071B2 (ja) | フルオロポリエーテル酸または塩およびシロキサン界面活性剤を含む重合剤を用いるフッ素化モノマーの水性重合 | |
JP5439186B2 (ja) | フルオロポリエーテル酸または塩および炭化水素系界面活性剤を含む重合剤を用いるフッ素化モノマーの水性重合 | |
JP5900587B2 (ja) | ポリテトラフルオロエチレン水性分散液の製造方法 | |
EP2287209B1 (en) | Method for producing polytetrafluoroethylene fine powder | |
JP6356693B2 (ja) | 高フッ素化ポリマー | |
WO2010056688A1 (en) | Fluorosulfonates | |
JP5598476B2 (ja) | 含フッ素重合体の製造方法 | |
JP5673541B2 (ja) | 含フッ素重合体の製造方法 | |
JP7208554B1 (ja) | 含フッ素ポリマーの製造方法 | |
JPS5952883B2 (ja) | テトラフルオロエチレンの分散重合法 | |
JP2012513531A (ja) | 水素含有分岐フルオロエーテル界面活性剤を用いたフッ素化モノマーの水性重合 | |
EP2319879B1 (en) | A peroxidic fluoropolyether and its use in emulsion polymerization of fluorin-containing monomer | |
JP2009227754A (ja) | 含フッ素共重合体の製造法 | |
CN114555657A (zh) | 在含非氟化磺酸盐型烃的表面活性剂存在下制备含氟聚合物和含氟弹性体的方法 | |
WO2009145117A1 (ja) | 含フッ素重合体の製造方法 | |
JP2001240608A (ja) | 含フッ素重合体の製造方法 | |
JP7410045B2 (ja) | 高固形分、無界面活性剤フルオロポリマー | |
JPH06322028A (ja) | フッ化ビニリデン系重合体の製造方法 | |
EP1741729A1 (en) | Polymerization process | |
JPWO2015111729A1 (ja) | 含フッ素弾性共重合体およびその製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22841984 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280049580.6 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022841984 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2022841984 Country of ref document: EP Effective date: 20240202 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |