WO2023032744A1 - 分離機能層、分離膜及び分離機能層の製造方法 - Google Patents
分離機能層、分離膜及び分離機能層の製造方法 Download PDFInfo
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- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- IGVNJALYNQVQIT-UHFFFAOYSA-N tert-butyl 2-bromo-2-methylpropanoate Chemical compound CC(C)(C)OC(=O)C(C)(C)Br IGVNJALYNQVQIT-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
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- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- UBZYKBZMAMTNKW-UHFFFAOYSA-J titanium tetrabromide Chemical compound Br[Ti](Br)(Br)Br UBZYKBZMAMTNKW-UHFFFAOYSA-J 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
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- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- 125000005425 toluyl group Chemical group 0.000 description 1
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- 125000003258 trimethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])[*:1] 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/34—Polyvinylidene fluoride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/40—Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/219—Specific solvent system
- B01D2323/226—Use of ionic liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/30—Cross-linking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Definitions
- the present invention relates to a separation functional layer, a separation membrane, and a method for producing a separation functional layer.
- a membrane separation method has been developed as a method for separating acidic gases from mixed gases containing acidic gases such as carbon dioxide.
- the membrane separation method can efficiently separate the acid gas while suppressing the operating cost, compared to the absorption method in which the acid gas contained in the mixed gas is absorbed by an absorbent and separated.
- Separation membranes used in the membrane separation method include composite membranes in which a separation functional layer is formed on a porous support.
- Patent Literature 1 discloses a composite membrane having a structure containing an ionic liquid as a separation functional layer.
- the separation functional layer includes an ionic liquid, a polymer network structure, and an inorganic particle network structure formed from inorganic particles.
- an object of the present invention is to provide a separation functional layer in which leakage of ionic liquid is suppressed and strength is improved.
- the present invention an ionic liquid; a polymer A that forms a crystal structure in the ionic liquid; a polymer B different from the polymer A; providing an isolation functional layer comprising:
- the present invention an ionic liquid; Polymer A, which is a fluorine-based polymer; a polymer B different from the polymer A; providing an isolation functional layer comprising:
- the present invention A method for producing a separation functional layer containing an ionic liquid, a polymer A forming a crystal structure in the ionic liquid, and a polymer B different from the polymer A,
- a method for producing a separation functional layer comprising at least one selected from the group consisting of the following steps (i) and (ii).
- FIG. 1 is a cross-sectional view of a separation functional layer according to one embodiment of the present invention
- FIG. 1 is a cross-sectional view of a separation membrane according to one embodiment of the present invention
- FIG. It is a schematic sectional drawing for demonstrating a press test. It is a schematic sectional drawing for demonstrating a press test.
- 1 is a schematic cross-sectional view of a membrane separation device equipped with the separation membrane of the present invention
- FIG. 3 is a perspective view schematically showing a modification of the membrane separation device provided with the separation membrane of the present invention.
- 4 is a scanning electron microscope (SEM) image of the surface of the separation functional layer after the separation membrane of Comparative Example 1 was subjected to a press test. 4 is an SEM image of the surface of the separation functional layer after the separation membrane of Example 2 was subjected to a press test.
- SEM scanning electron microscope
- the separation functional layer according to the first aspect of the present invention is an ionic liquid; a polymer A that forms a crystal structure in the ionic liquid; a polymer B different from the polymer A; including.
- the polymer A is a fluoropolymer.
- the separation functional layer according to the third aspect of the present invention is an ionic liquid; Polymer A, which is a fluorine-based polymer; a polymer B different from the polymer A; including.
- the polymer B has a crosslinked structure.
- the polymer A and the polymer B form an interpenetrating polymer network structure.
- the polymer A comprises a partially fluorinated monomer a1 and a fully fluorinated monomer It is a copolymer with a2.
- the polymer A is a copolymer of vinylidene fluoride and hexafluoropropylene.
- the polymer B is a (meth)acrylic polymer.
- the polymer B is a copolymer of N,N-dimethylacrylamide and N-acryloyloxysuccinimide. and at least one selected from the group consisting of a structure derived from a copolymer of n-butyl (meth)acrylate and (meth)acrylic acid.
- the polymer B is at least one selected from the group consisting of amine-based cross-linking agents and epoxy-based cross-linking agents. It is a cross-linked product with two cross-linking agents.
- the ionic liquid contains imidazolium ions.
- the ionic liquid is 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, At least one selected from the group consisting of 1-ethyl-3-methylimidazolium dicyanamide and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide.
- the ionic liquid content is 60 wt% or more.
- the separation functional layer according to any one of the 1st to 13th aspects is used to separate carbon dioxide from a mixed gas containing carbon dioxide and nitrogen.
- the separation membrane according to the fifteenth aspect of the present invention comprises a separation functional layer according to any one of the first to fourteenth aspects; a porous support supporting the separation functional layer; Prepare.
- the separation membrane according to the fifteenth aspect has a rate of decrease in the separation coefficient ⁇ of carbon dioxide with respect to nitrogen of 20% or less when a press test is performed.
- the press test is performed by applying a compressive load of 5 N/cm 2 to the separation membrane for 1 hour.
- a method for producing a separation functional layer according to the seventeenth aspect of the present invention comprises: A method for producing a separation functional layer containing an ionic liquid, a polymer A forming a crystal structure in the ionic liquid, and a polymer B different from the polymer A, It includes at least one selected from the group consisting of the following steps (i) and (ii).
- FIG. 1 is a cross-sectional view of the separation functional layer 1 of this embodiment.
- the separation functional layer 1 contains an ionic liquid L, a polymer A that forms a crystal structure in the ionic liquid L, and a polymer B different from the polymer A.
- polymer A and polymer B have different compositions from each other.
- an ionic liquid means a salt (ionic compound) that is liquid at 25°C.
- the separation function layer 1 in FIG. 1 can function as a self-supporting film (single layer film).
- the separation functional layer 1 can preferentially permeate the acid gas contained in the mixed gas.
- polymer A and polymer B preferably form an interpenetrating polymer network (IPN) structure.
- IPN interpenetrating polymer network
- a first network structure made of polymer A and a second network structure made of polymer B are entangled with each other.
- the ionic liquid L for example, exists in the space between these network structures and fills the space.
- the ionic liquid L contained in the separation functional layer 1 contains, for example, at least one selected from the group consisting of imidazolium ions, pyridinium ions, ammonium ions and phosphonium ions, preferably imidazolium ions. These ions include, for example, substituents having 1 or more carbon atoms.
- substituents having 1 or more carbon atoms include alkyl groups having 1 to 20 carbon atoms, cycloalkyl groups having 3 to 14 carbon atoms, aryl groups having 6 to 20 carbon atoms, and the like. , a cyano group, an amino group, a monovalent ether group, etc. (for example, a hydroxyalkyl group having 1 to 20 carbon atoms, etc.).
- Ether groups include, for example, polyalkylene glycol groups such as polyethylene glycol.
- alkyl groups having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n- nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n-heptadecyl group, n-octadecyl group, n- nonadecyl group, n-eicosadecyl group, i-propyl group, sec-butyl group, i-butyl group, 1-methylbutyl group, 1-ethylpropyl group, 2-methylbutyl
- the above alkyl group may be substituted with a cycloalkyl group.
- the number of carbon atoms in the alkyl group substituted by the cycloalkyl group is, for example, 1 or more and 20 or less.
- Alkyl groups substituted by cycloalkyl groups include cyclopropylmethyl, cyclobutylmethyl, cyclohexylmethyl, cyclohexylpropyl groups and the like, which further include hydroxy, cyano, amino, monovalent ether It may be substituted with a group or the like.
- cycloalkyl groups having 3 to 14 carbon atoms include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, norbornyl, bornyl and adamantyl groups. , and these may be further substituted with a hydroxy group, a cyano group, an amino group, a monovalent ether group, or the like.
- aryl group having 6 to 20 carbon atoms examples include phenyl, toluyl, xylyl, mesityl, anisyl, naphthyl, benzyl, etc. These are further hydroxy, cyano, amino, mono may be substituted with a valent ether group or the like.
- the ionic liquid L preferably contains imidazolium ions represented by the following formula (1).
- R 1 to R 5 are each independently a hydrogen atom or the above-described substituent having 1 or more carbon atoms.
- R 1 is preferably a substituent having 1 or more carbon atoms, more preferably an alkyl group having 1 to 20 carbon atoms, still more preferably an alkyl group having 2 to 10 carbon atoms, particularly preferably ethyl or n-butyl group.
- R 3 is preferably a substituent having 1 or more carbon atoms, more preferably an alkyl group having 1 to 20 carbon atoms, still more preferably an alkyl group having 1 to 10 carbon atoms, particularly preferably methyl is the base.
- Each of R 2 , R 4 and R 5 is preferably a hydrogen atom.
- the ions described above may form a salt with a counter anion.
- Counter anions include alkylsulfate, tosylate, methanesulfonate, trifluoromethanesulfonate, toluenesulfonate, acetate, bis(fluorosulfonyl)imide, bis(trifluoromethanesulfonyl)imide, thiocyanate, dicyanamide, tricyanometanide, tetracyanoborate.
- hexafluorophosphate tetrafluoroborate, halide and the like, preferably bis(trifluoromethanesulfonyl)imide, dicyanamide, bis(fluorosulfonyl)imide and the like.
- ionic liquids include 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, 1-ethyl-3-methylimidazolium Dicyanamide, 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluoro Phosphate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 1-butyl-3-methylimidazolium tetrachloroferrate, 1-butyl-3-methylimidazolium iodide, 1-butyl-2,3-dimethyl imidazolium chloride, 1-butyl-2,3-dimethyl imid
- ionic liquids include 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM][Tf 2 N]), 1-ethyl-3-methylimidazolium dicyanamide ([EMIM][ DCA]), and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide ([EMIM] [FSI]).
- the content of the ionic liquid L in the separation functional layer 1 is, for example, 5 wt% or more, preferably 30 wt% or more, more preferably 50 wt% or more, and still more preferably 60 wt% or more. , particularly preferably 70 wt % or more, and particularly preferably 80 wt % or more.
- the upper limit of the content of the ionic liquid L is not particularly limited, and is, for example, 95 wt%, and may be 90 wt%. When the content of the ionic liquid L is 95 wt % or less, there is a tendency that the self-supporting property of the separation functional layer 1 can be easily ensured.
- Polymer A forms a crystalline structure in ionic liquid L as described above. In other words, the polymer A crystallizes in the ionic liquid L. In the ionic liquid L, the polymer A may be entirely crystallized, or the polymer A may be partially crystallized.
- “Polymer A forms a crystal structure in ionic liquid L” means that when X-ray diffraction (XRD) measurement is performed on a sample containing polymer A and ionic liquid L at room temperature (25 ° C.), It means that a peak derived from the crystal structure of polymer A can be confirmed.
- XRD X-ray diffraction
- the sample used for XRD measurement was obtained by dissolving 1.3 g of polymer A in a mixed liquid consisting of 5 g of ionic liquid L and 10.24 g of acetone, drying the resulting solution at 30 ° C. for 24 hours, and then adding 70 It is prepared by drying at °C for 24 hours. Drying of the solution can be performed using, for example, a petri dish made of polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the crystallization of polymer A is caused by physical cross-linking of multiple polymer A molecules in ionic liquid L.
- Physical cross-linking means aggregation of multiple polymer molecules due to interactions such as intermolecular forces. It can be said that the polymer A has physical cross-linking points in the ionic liquid L.
- the polymer A does not have a chemical crosslinked structure, for example. Chemical cross-linking means that multiple polymer molecules are attached to each other through covalent bonds.
- Polymer A is typically a fluoropolymer.
- a fluoropolymer is a polymer having a structural unit S derived from a fluorinated monomer a.
- the fluoropolymer may have, for example, a structural unit S derived from a fluorinated monomer a as a main component, and may be substantially composed of the structural unit S only.
- the term "main component" means a structural unit that is the most contained on a weight basis among all the structural units that constitute the fluoropolymer.
- the fluoropolymer may further contain structural units other than the structural unit S.
- an ionic liquid L comprising:
- the monomer a has, for example, a carbon-carbon double bond as a polymerizable group.
- Monomer a is typically a fluorinated olefin.
- Monomer a may contain heteroatoms other than fluorine atoms, but preferably does not.
- the number of carbon atoms in the monomer a is not particularly limited, and is, for example, 2-10, preferably 2-5.
- the monomer a may be partially fluorinated or fully fluorinated.
- the polymer A contains at least one selected from the group consisting of a structural unit S1 derived from a partially fluorinated monomer a1 and a structural unit S2 derived from a fully fluorinated monomer a2. It is preferable that both the structural unit S1 and the structural unit S2 are included.
- Polymer A is preferably a copolymer of partially fluorinated monomer a1 and fully fluorinated monomer a2.
- This copolymer may be a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, etc., but is preferably a random copolymer or a block copolymer.
- Polymer A, which is a block copolymer is, for example, a first block composed of structural units S1 derived from partially fluorinated monomers a1, and a first block composed of structural units S2 derived from fully fluorinated monomers a2. 2 blocks.
- the partially fluorinated monomer a1 is typically a partially fluorinated olefin.
- olefins include vinylidene fluoride, vinyl fluoride, chlorotrifluoroethylene and the like, preferably vinylidene fluoride.
- the perfluorinated monomer a2 is typically a perfluorinated olefin.
- olefins include hexafluoropropylene, tetrafluoroethylene and the like, preferably hexafluoropropylene.
- Polymer A is preferably a copolymer of vinylidene fluoride and hexafluoropropylene, particularly a random or block copolymer thereof.
- the structural unit derived from vinylidene fluoride tends to exhibit high crystallinity in the ionic liquid L.
- copolymers of vinylidene fluoride and hexafluoropropylene form crystal structures in ionic liquids L such as [EMIM][ Tf2N ], [EMIM][DCA], [EMIM][FSI]. be able to.
- the content of the structural unit S1 derived from the partially fluorinated monomer a1 is not particularly limited, and is, for example, 1 wt% to 99 wt%.
- the content of the structural unit S2 derived from the fully fluorinated monomer a2 is not particularly limited, and is, for example, 1 wt % to 99 wt %.
- the weight average molecular weight of polymer A is not particularly limited, and is, for example, 10,000 to 1,000,000.
- the weight-average molecular weight of polymer A is obtained by measuring the molecular weight distribution of polymer A by, for example, gel permeation chromatography (GPC) equipped with a differential refractive index detector (RID), and from the obtained chromatogram (chart), It can be calculated using a standard polystyrene calibration curve.
- the melting point of polymer A is not particularly limited, and is, for example, 130°C or higher, preferably 140°C or higher.
- the upper limit of the melting point of polymer A is not particularly limited, and is, for example, 180°C.
- the melting point of polymer A can be measured using a commercially available differential scanning calorimeter.
- a separation functional layer 1 comprising:
- the content of the polymer A in the separation functional layer 1 is not particularly limited, and is, for example, 1 wt% or more, preferably 5 wt% or more, more preferably 10 wt% or more.
- the strength of the separation functional layer 1 tends to improve as the content of the polymer A increases.
- the upper limit of the content of polymer A is not particularly limited, and is, for example, 20 wt%, and may be 15 wt%.
- Polymer B is not particularly limited as long as it is different from polymer A.
- Polymer B may not have a crosslinked structure, but preferably has a crosslinked structure.
- the crosslinked structure possessed by the polymer B is, for example, a chemically crosslinked structure.
- polymer B is, for example, a crosslinked prepolymer.
- Polymer B is sometimes simply referred to herein as a crosslinked product. Whether the polymer B has a crosslinked structure can be determined by measuring the gel fraction of the polymer B, for example.
- Polymer B does not form a crystal structure in ionic liquid L, for example. In other words, the polymer B has higher solubility in the ionic liquid L than the polymer A.
- the weight average molecular weight (Mw) of polymer B is, for example, 5,000 or more, preferably 10,000 or more, more preferably 20,000 or more, and even more preferably 40,000 or more.
- the upper limit of the weight average molecular weight of polymer B is not particularly limited, and is, for example, 5 million, preferably 2 million, more preferably 1.5 million. When the weight average molecular weight of the polymer B is 40000 or more, the mechanical strength of the separation functional layer 1 tends to be improved.
- the weight average molecular weight of polymer B is obtained by measuring the molecular weight distribution of polymer B by, for example, gel permeation chromatography (GPC) equipped with a differential refractive index detector (RID), and from the obtained chromatogram (chart), It can be calculated using a standard polystyrene calibration curve.
- GPC gel permeation chromatography
- RID differential refractive index detector
- polymer B is, for example, a crosslinked prepolymer.
- An aspect in which the polymer B is a crosslinked prepolymer will be described in detail below.
- the prepolymer for forming polymer B has a polymer chain containing constitutional units derived from monomers. This polymer chain is formed, for example, by radical polymerization of a monomer.
- a plurality of polymer chains are crosslinked by crosslinked chains.
- the polymer chain and the crosslinked chain are preferably linked by at least one bond selected from the group consisting of hydrazone bond, amide bond, imide bond, urethane bond, ether bond and ester bond.
- the prepolymer may be a homopolymer, copolymer, or mixture thereof. Copolymers include random copolymers, block copolymers, alternating copolymers, graft copolymers, and the like.
- the prepolymer may contain a (meth)acrylic polymer.
- a (meth)acrylic polymer is a polymer having a structural unit U derived from a monomer b containing a (meth)acryl group and/or a (meth)acrylamide group.
- the (meth)acrylic polymer may have, for example, the structural unit U derived from the monomer b as a main component, and may be substantially composed of the structural unit U only.
- the (meth)acrylic polymer may further contain structural units other than the structural unit U.
- “(meth)acryl” means acryl and/or methacryl.
- the prepolymer contains a (meth)acrylic polymer
- the crosslinked product is also a (meth)acrylic polymer. That is, polymer B may be a (meth)acrylic polymer.
- the prepolymer is preferably a polymer having cross-linking points capable of reacting with the cross-linking agent described below.
- Cross-linking points are located at either the terminal, main chain or side chain of the prepolymer.
- the cross-linking point is preferably located on the side chain of the prepolymer from the viewpoint of obtaining a highly three-dimensionally cross-linked product.
- the prepolymer preferably has a functional group, especially a polar group, that functions as a cross-linking point.
- a polar group means an atomic group containing atoms other than carbon and hydrogen, and typically means an atomic group containing at least one selected from the group consisting of N atoms and O atoms.
- Polar groups include, for example, amino groups, amide groups, imide groups, morpholino groups, carboxyl groups, ester groups, hydroxyl groups, and ether groups.
- the amino group includes not only a primary amino group but also a secondary amino group and a tertiary amino group substituted with an alkyl group or the like.
- the amide group includes a (meth)acrylamide group, an acetamide group, a pyrrolidone group and the like.
- the ether group includes polyalkyl ether groups such as polyethylene glycol group and polypropylene glycol group; epoxy group; vinyloxy group and the like.
- the prepolymer preferably contains structural units derived from a polar group-containing monomer.
- the polar group-containing monomer is, for example, at least one selected from the group consisting of amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, vinyloxy group-containing monomers, carboxyl group-containing monomers and hydroxyl group-containing monomers. It preferably contains a seed, and more preferably contains at least one selected from the group consisting of amide group-containing monomers, imide group-containing monomers, vinyloxy group-containing monomers and carboxyl group-containing monomers.
- amide group-containing monomers examples include acrylamide, methacrylamide, N-vinylpyrrolidone, N,N-diallylacrylamide, N-methylacrylamide, N,N-dimethylacrylamide, N,N-dimethylmethacrylamide, N,N- diethylacrylamide, N,N-diethylmethacrylamide, N,N'-methylenebisacrylamide, N,N-dimethylaminopropylacrylamide, N,N-dimethylaminopropylmethacrylamide, diacetoneacrylamide and the like.
- imide group-containing monomers examples include N-(meth)acryloyloxysuccinimide, N-(meth)acryloyloxymethylenesuccinimide, and N-(meth)acryloyloxyethylenesuccinimide.
- amino group-containing monomers examples include aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and N,N-dimethylaminopropyl (meth)acrylate.
- epoxy group-containing monomers examples include glycidyl (meth)acrylate, methylglycidyl (meth)acrylate, 3-ethyloxetan-3-yl (meth)acrylate, and allyl glycidyl ether.
- vinyloxy group-containing monomers examples include 2-(2-vinyloxyethoxy)ethyl (meth)acrylate, 2-vinyloxyethyl (meth)acrylate, and 4-vinyloxypropyl (meth)acrylate.
- Carboxyl group-containing monomers include (meth)acrylic acid and the like.
- hydroxyl group-containing monomers examples include 4-hydroxybutyl (meth)acrylate and the like.
- the polar group-containing monomers may be used singly or in combination of two or more.
- N,N'-methylenebisacrylamide, diacetoneacrylamide (DAAm), N-acryloyloxysuccinimide (NSA), etc. are copolymerized together with N-methylacrylamide or N,N-dimethylacrylamide (DMAAm) to form a prepolymer.
- DAAm diacetoneacrylamide
- NSA N-acryloyloxysuccinimide
- DMAAm N,N-dimethylacrylamide
- the prepolymer may contain structural units derived from N,N-dimethylacrylamide and structural units derived from N-acryloyloxysuccinimide. It may be a copolymer with.
- the prepolymer may contain structural units derived from monomers other than the polar group-containing monomer.
- Other monomers include, for example, alkyl (meth)acrylates such as methyl (meth)acrylate and n-butyl (meth)acrylate.
- the prepolymer may contain a structural unit derived from n-butyl (meth) acrylate and a structural unit derived from (meth) acrylic acid, n-butyl (meth) acrylate and (meth) It may be a copolymer with acrylic acid.
- Polymer B is, for example, a structure derived from a copolymer of N,N-dimethylacrylamide and N-acryloyloxysuccinimide, and a copolymer of n-butyl (meth)acrylate and (meth)acrylic acid. and preferably a structure derived from a copolymer of N,N-dimethylacrylamide and N-acryloyloxysuccinimide.
- the prepolymer may contain a structural unit that functions as a cross-linking agent, such as a structural unit derived from a polyfunctional (meth)acrylate.
- a prepolymer having this constitutional unit can be self-crosslinked.
- a polyfunctional (meth)acrylate means a monomer having two or more (meth)acrylic groups in one molecule.
- Polyfunctional (meth)acrylates include, for example, trimethylolpropane tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, 1,2-ethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth) Acrylate, dipentaerythritol hexaacrylate and the like.
- the weight average molecular weight (Mw) of the prepolymer is preferably 2500 or more, more preferably 5000 or more, and even more preferably 10000 or more.
- the upper limit of the weight average molecular weight of the prepolymer is not particularly limited, and is, for example, 2,500,000, preferably 1,000,000, more preferably 750,000.
- the weight average molecular weight of the prepolymer can be determined by the method described above for crosslinked products.
- a prepolymer is obtained, for example, by polymerizing a monomer having a functional group that functions as a cross-linking point in the presence of a polymerization initiator.
- the polymerization of the monomer is preferably radical polymerization. Radical polymerization may be thermal polymerization or photopolymerization (for example, polymerization by ultraviolet irradiation).
- an azo polymerization initiator As the polymerization initiator, an azo polymerization initiator, a peroxide initiator, a redox initiator obtained by combining a peroxide and a reducing agent, a substituted ethane initiator, or the like can be used.
- various photopolymerization initiators can be used.
- a photosensitizer such as 2-oxoglutarate may be used.
- Azo polymerization initiators include 2,2′-azobisisobutyronitrile (AIBN), 2,2′-azobis-2-methylbutyronitrile, dimethyl-2,2′-azobis(2-methylbutyronitrile), pionate), 4,4′-azobis-4-cyanovaleric acid, azobisisovaleronitrile, 2,2′-azobis(2-amidinopropane) dihydrochloride, 2,2′-azobis[2-(5- methyl-2-imidazolin-2-yl)propane]dihydrochloride, 2,2'-azobis(2-methylpropionamidine) disulfate, 2,2'-azobis(N,N'-dimethyleneisobutyramidine) dihydro chloride and the like.
- AIBN 2,2′-azobisisobutyronitrile
- 2,2′-azobis-2-methylbutyronitrile dimethyl-2,2′-azobis(2-methylbutyronitrile), pionate
- Persulfates such as potassium persulfate and ammonium persulfate; dibenzoyl peroxide, t-butyl permaleate, t-butyl hydroperoxide, di-t-butyl peroxide, t- Butyl peroxybenzoate, dicumyl peroxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(t-butylperoxy)cyclododecane, hydrogen peroxide etc.
- redox initiators examples include a combination of peroxide and ascorbic acid (such as a combination of aqueous hydrogen peroxide and ascorbic acid), a combination of peroxide and iron (II) salt (a combination of aqueous hydrogen peroxide and iron ( II) combinations with salts, etc.), combinations of persulfates and sodium hydrogen sulfite, and the like.
- substituted ethane-based initiators include phenyl-substituted ethane.
- Photopolymerization initiators include acetophenone, ketal, benzophenone, benzoin, benzoyl, xanthone, active halogen compounds (triazine, halomethyloxadiazole, coumarin), acridine, biimidazole, An oxime ester system and the like can be mentioned.
- Acetophenone-based photopolymerization initiators include, for example, 2,2-diethoxyacetophenone, p-dimethylaminoacetophenone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, p-dimethylaminoacetophenone, 4 '-isopropyl-2-hydroxy-2-methyl-propiophenone, 1-hydroxycyclohexylphenyl ketone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone, 2-tolyl-2 -dimethylamino-1-(4-morpholinophenyl)-1-butanone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-1-propanone and the like.
- ketal-based photopolymerization initiators include benzyl dimethyl ketal and benzyl- ⁇ -methoxyethyl acetal.
- benzophenone-based photopolymerization initiators include benzophenone, 4,4'-(bisdimethylamino)benzophenone, 4,4'-(bisdiethylamino)benzophenone, and 4,4'-dichlorobenzophenone.
- Benzoin-based or benzoyl-based photopolymerization initiators include, for example, benzoin isopropyl ether, benzoin isobutyl ether, benzoin methyl ether, and methyl o-benzoyl benzoate.
- xanthone-based photopolymerization initiators examples include diethylthioxanthone, diisopropylthioxanthone, monoisopropylthioxanthone, and chlorothioxanthone.
- Triazine-based photopolymerization initiators include, for example, 2,4-bis(trichloromethyl)-6-p-methoxyphenyl-s-triazine, 2,4-bis(trichloromethyl)-6-p-methoxystyryl-s -triazine, 2,4-bis(trichloromethyl)-6-(1-p-dimethylaminophenyl)-1,3-butadienyl-s-triazine, 2,4-bis(trichloromethyl)-6-biphenyl-s -triazine, 2,4-bis(trichloromethyl)-6-(p-methylbiphenyl)-s-triazine, p-hydroxyethoxystyryl-2,6-di(trichloromethyl)-s-triazine, methoxystyryl-2 ,6-di(trichloromethyl)-s-triazine, 3,4-dimethoxystyryl
- halomethyloxadiazole-based photopolymerization initiators include 2-trichloromethyl-5-styryl-1,3,4-oxodiazole, 2-trichloromethyl-5-(cyanostyryl)-1,3, 4-oxodiazole, 2-trichloromethyl-5-(naphth-1-yl)-1,3,4-oxodiazole, 2-trichloromethyl-5-(4-styryl)styryl-1,3,4 - oxodiazole and the like.
- Coumarin-based photopolymerization initiators include, for example, 3-methyl-5-amino-((s-triazin-2-yl)amino)-3-phenylcoumarin, 3-chloro-5-diethylamino-((s-triazine -2-yl)amino)-3-phenylcoumarin, 3-butyl-5-dimethylamino-((s-triazin-2-yl)amino)-3-phenylcoumarin and the like.
- acridine-based photopolymerization initiators examples include 9-phenylacridine and 1,7-bis(9-acridinyl)heptane.
- Biimidazole-based photopolymerization initiators include, for example, 2-(o-chlorophenyl)-4,5-diphenylimidazolyl dimer, 2-(o-methoxyphenyl)-4,5-diphenylimidazolyl dimer, 2 lophine dimers such as -(2,4-dimethoxyphenyl)-4,5-diphenylimidazolyl dimer; 2-mercaptobenzimidazole; 2,2'-dibenzothiazolyl disulfide and the like.
- oxime ester photopolymerization initiators examples include 1,2-octanedione, 1-[4-(phenylthio)-2-(O-benzoyloxime)], ethanone, 1-[9-ethyl-6-( 2-methylbenzoyl)-9H-carbazol-3-yl]-1-(O-acetyloxime) and the like.
- the polymerization initiator can be used alone or in combination of two or more.
- the polymerization initiator is preferably 2,2'-azobisisobutyronitrile.
- the amount of the polymerization initiator to be blended is not particularly limited, and is, for example, 0.1 parts by mass or more, preferably 0.3 parts by mass or more, relative to 100 parts by mass of the monomer.
- the amount of the polymerization initiator compounded is preferably 3 parts by mass or less, more preferably 2 parts by mass or less, relative to 100 parts by mass of the monomer.
- the prepolymer synthesis may be performed in the presence of a solvent.
- organic solvents are preferable, and examples include ketone organic solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; ester organic solvents such as methyl acetate, ethyl acetate and butyl acetate; dimethylformamide, dimethyl sulfoxide, N-methyl- Polar solvents such as 2-pyrrolidone; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol and isopropyl alcohol; aromatic hydrocarbon-based organic solvents such as toluene and xylene; aliphatic hydrocarbons such as n-hexane, cyclohexane and methylcyclohexane System/alicyclic hydrocarbon-based organic solvents; cellosolve-based organic solvents such as methyl cellosolve, ethyl cellosolve, and butyl cellosolve;
- the method for synthesizing the prepolymer is not particularly limited, and solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, atom transfer radical polymerization (ATRP: Atom Transfer Radical Polymerization), reversible addition-fragmentation chain transfer polymerization (Raft: Reversible Known methods such as Addition Fragmentation chain Transfer) can be used, but solution polymerization is preferred from the viewpoint of workability.
- the prepolymer may be synthesized by photopolymerization in the presence of a solvent or by solventless photopolymerization, particularly UV polymerization.
- ATRP initiators examples include tert-butyl 2-bromoisobutyrate, methyl 2-bromoisobutyrate, 2-bromoisobutyryl bromide, ethyl 2-bromoisobutyrate, 2-hydroxyethyl 2-bromoisobutyrate, ethylenebis(2- bromoisobutyrate), 1-tris(hydroxymethyl)ethane, and pentaerythritol tetrakis(2-bromoisobutyrate).
- ATRP catalyst ligands include, for example, 2,2′-bipyridyl, 4,4′-dimethyl-2,2′-dipyridyl, 4,4′-di-tert-butyl-2,2′-dipyridyl, 4,4'-dinonyl-2,2'-dipyridyl, N-butyl-2-pyridylmethanimine, N-octyl-2-pyridylmethanimine, N-dodecyl-N-(2-pyridylmethylene)amine, N- octadecyl-N-(2-pyridylmethylene)amine, N,N,N',N'',N'-pentamethyldiethylenetriamine and the like.
- metal salts for ATRP catalysts include copper (I) chloride, copper (II) chloride, copper (I) bromide, copper (II) bromide, titanium (II) chloride, titanium (III) chloride, titanium chloride (IV), titanium (IV) bromide, iron (II) chloride, and the like.
- RAFT agents include, for example, cyanomethyl-dodecyltrithiocarbonate, 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid, 2-cyano-2-propyldodecyltrithiocarbonate and the like.
- the polymerization temperature is, for example, 25-80°C, preferably 30-70°C, more preferably 40-60°C.
- the polymerization temperature is preferably 10 to 60.degree. C., more preferably 20 to 50.degree. C., still more preferably 20 to 40.degree.
- the polymerization time is, for example, 1 to 100 hours, preferably 20 to 80 hours, more preferably 30 to 70 hours, still more preferably 40 to 60 hours.
- the polymerization time is, for example, 0.1 to 100 hours, preferably 1 to 70 hours, more preferably 5 to 40 hours, still more preferably 10 to 30 hours.
- the wavelength of the ultraviolet light to be used is not particularly limited as long as the monomer can be radically polymerized. More preferably 300 to 400 nm.
- the intensity of the ultraviolet rays is not particularly limited, it is, for example, 1 to 3000 mJ/(cm 2 ⁇ s), preferably 10 to 2000 mJ/(cm 2 ⁇ s), considering the polymerization time and safety.
- Polymer B can be formed, for example, by reaction of a prepolymer with a crosslinker. However, when the prepolymer contains a structural unit that functions as a cross-linking agent, polymer B can be formed by reaction between the prepolymers.
- the cross-linking agent can be appropriately selected according to the composition of the prepolymer.
- cross-linking agents include polyfunctional (meth)acrylates, hydrazide-based cross-linking agents, amine-based cross-linking agents, isocyanate-based cross-linking agents, epoxy-based cross-linking agents, aziridine-based cross-linking agents, melamine-based cross-linking agents, metal chelate-based cross-linking agents, Examples include metal salt-based cross-linking agents, peroxide-based cross-linking agents, oxazoline-based cross-linking agents, urea-based cross-linking agents, carbodiimide-based cross-linking agents, and coupling agent-based cross-linking agents (for example, silane coupling agents).
- a cross-linking agent can be used 1 type or in combination of 2 or more types.
- Polymer B is preferably a cross-linked product with at least one cross-linking agent selected from the group consisting of an amine-based cross-linking agent and an epoxy-based cross-linking agent. More preferably, it is a reactant with an agent.
- polyfunctional (meth)acrylates examples include those mentioned above for prepolymers.
- hydrazide cross-linking agents examples include isophthalic acid dihydrazide, terephthalic acid dihydrazide, phthalic acid dihydrazide, 2,6-naphthalenedicarboxylic acid dihydrazide, naphthalene acid dihydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutamic acid dihydrazide, and adipine.
- amine cross-linking agents examples include hexamethylenediamine, 1,12-dodecanediamine, hexamethylenediamine carbamate, N,N-dicinnamylidene-1,6-hexanediamine, tetramethylenepentamine, and hexamethylenediamine cinnamaldehyde adducts.
- aliphatic polyvalent amines such as; 4,4-(p-phenylenediisopropylidene)dianiline, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 4,4-diaminobenzanilide, 4,4-bis(4-aminophenoxy ) aromatic polyamines such as biphenyl, m-xylylenediamine, p-xylylenediamine, 1,3,5-benzenetriamine; polyethylene glycol diamine, polypropylene glycol diamine, diethylene glycol bis(3-aminopropyl) ether, etc. and diamines having a polyether in the main chain, and diethylene glycol bis(3-aminopropyl) ether is preferred.
- isocyanate-based cross-linking agents examples include 1,6-hexamethylene diisocyanate, 1,4-tetramethylene diisocyanate, 2-methyl-1,5-pentane diisocyanate, 3-methyl-1,5-pentane diisocyanate, lysine diisocyanate, and the like.
- Alicyclic polyisocyanates such as isophorone diisocyanate, cyclohexyl diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated tetramethylxylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenyl ether diisocyanate, 2-nitrodiphenyl-4,4'-diisocyanate, 2,2'-diphenyl Propane-4,4'-diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 4,4'-diphenylpropane diisocyanate, m-phenylene diis
- isocyanate-based cross-linking agents include dimers and trimers of the exemplified isocyanate compounds, reaction products or polymers (e.g., dimers and trimers of diphenylmethane diisocyanate, reaction products of trimethylolpropane and tolylene diisocyanate products, reaction products of trimethylolpropane and hexamethylene diisocyanate, polymethylene polyphenyl isocyanate, polyether polyisocyanate, polyester polyisocyanate) and the like can also be used.
- the isocyanate-based cross-linking agent a reaction product of trimethylolpropane and tolylene diisocyanate is preferred.
- epoxy-based cross-linking agents include 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, N,N,N',N'-tetraglycidyl-m-xylylenediamine, diglycidylaniline, 1, 6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, penta erythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, adipate diglycid
- the polymer B may not have a crosslinked structure, and may not be a crosslinked product of a prepolymer.
- the polymer B is a (meth)acrylic polymer having no crosslinked structure.
- Polymer B for example, contains a structural unit derived from an alkyl (meth)acrylate such as methyl (meth)acrylate and n-butyl (meth)acrylate as a main component, and may be substantially composed only of the structural unit. good.
- Polymer B may have the composition and structure described above for the prepolymer.
- the content of the polymer B in the separation functional layer 1 is not particularly limited, and is, for example, 1 wt% or more, preferably 5 wt% or more, more preferably 10 wt% or more.
- the polymer B tends to have a high affinity with the ionic liquid L. Therefore, there is a tendency that the higher the content of the polymer B, the more the ionic liquid L can be prevented from leaking from the separation functional layer 1 .
- the upper limit of the content of polymer B is not particularly limited, and is, for example, 20 wt%, and may be 15 wt%.
- the method for manufacturing the separation functional layer 1 includes, for example, at least one selected from the group consisting of the following steps (i) and (ii).
- step (i) the manufacturing method including step (i) will be described. According to the manufacturing method including step (i), separation functional layer 1 containing polymer B having a crosslinked structure is obtained.
- the mixed liquid M1 further contains a solvent such as an organic solvent, for example.
- Organic solvents include, for example, polar solvents such as acetone.
- the concentration of the non-volatile components (ionic liquid L, polymer A, prepolymer and cross-linking agent) in the mixture M1 is not particularly limited, and is, for example, 10 wt % to 90 wt %, and may be 30 wt % to 50 wt %.
- the total value of the concentration of the polymer A and the concentration of the components (prepolymer and cross-linking agent) forming the polymer B is not particularly limited, and is, for example, 1 wt% to 50 wt%, 1 wt% to 20 wt%. %.
- the ratio of the amount of the cross-linking agent to the prepolymer is not particularly limited, and is, for example, 0.1 mol % to 10 mol %, and may be 1 mol % to 5 mol %.
- the ratio of the amount of the cross-linking agent to the total number of cross-linking points contained in the prepolymer is not particularly limited, and is, for example, 10 mol % to 90 mol %, and may be 25 mol % to 75 mol %.
- the mixed liquid M1 can be prepared, for example, by adding a material such as polymer A to the solvent while the solvent is being stirred.
- a material such as polymer A is not particularly limited.
- polymer A, prepolymer, ionic liquid L, and cross-linking agent may be added to the solvent in this order.
- the mixture M1 is applied to the base material, and then the prepolymer and the cross-linking agent are reacted.
- the substrate is typically a release liner.
- release liners include films containing resins; papers; and sheets containing metal materials such as aluminum and stainless steel. Sheets comprising metallic materials tend to have high heat resistance.
- the release liner is preferably a film containing a resin because of its excellent surface smoothness.
- Polymers contained in the resin of the release liner include polyolefins such as polyethylene, polypropylene, polybutene, polybutadiene and polymethylpentene; polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyvinyl chloride and vinyl chloride copolymers. polyurethane; ethylene-vinyl acetate copolymer and the like, and polyester, particularly polyethylene terephthalate, is preferred.
- polyolefins such as polyethylene, polypropylene, polybutene, polybutadiene and polymethylpentene
- polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate
- polyvinyl chloride and vinyl chloride copolymers polyurethane; ethylene-vinyl acetate copolymer and the like, and polyester, particularly polyethylene terephthalate, is preferred.
- the surface of the release liner may be subjected to release treatment.
- the release treatment can be performed, for example, by applying a release agent to the surface of the release liner.
- release agents include silicone-based release agents, long-chain alkyl-based release agents, fluorine-based release agents, and molybdenum sulfide-based release agents.
- the release agent may be used alone or in combination of two or more.
- the release liner is preferably a release-treated polyethylene terephthalate (PET) film.
- the thickness of the release liner is not particularly limited, and is, for example, 5-100 ⁇ m, preferably 10-50 ⁇ m.
- the method of applying the mixed liquid M1 to the substrate is not particularly limited, and for example, a spin coating method, a dip coating method, or the like can be used.
- the liquid mixture M1 may be applied to the substrate using an applicator, wire bar, or the like.
- a coating film is formed by applying the mixed liquid M1 to the substrate.
- the mixture M1 is placed in the mold, and then the prepolymer and the cross-linking agent are reacted.
- the mold is typically a petri dish made of PTFE.
- the reaction of the prepolymer and the cross-linking agent is performed, for example, by heating the mixture M1 (specifically, a coating film prepared by coating the mixture M1 on a substrate, or the mixture M1 placed in a mold). It can be advanced by processing.
- the temperature of the heat treatment is not particularly limited, and is, for example, 30°C or higher, and may be 50°C to 110°C.
- the heat treatment time is, for example, 1 minute or longer, and may be 5 minutes or longer.
- Polymer B having a crosslinked structure is formed as the reaction between the prepolymer and the crosslinking agent proceeds. Thereby, the separation functional layer 1 containing the ionic liquid L, the polymer A and the polymer B is formed. By peeling off the separation functional layer 1 from the substrate or mold, the separation functional layer 1 functioning as a self-supporting film can be obtained.
- step (ii) a manufacturing method including step (ii) will be described.
- the production method including step (ii) is suitable for producing separation functional layer 1 containing polymer B having no crosslinked structure.
- the mixed liquid M2 has the same composition as the mixed liquid M1 described above, except that the polymer B is included instead of the prepolymer and the cross-linking agent (that is, the ionic liquid L, the polymer A and the polymer B are included).
- the separation functional layer 1 is produced by drying the mixed liquid M2 (specifically, the coating film produced by applying the mixed liquid M2 to the substrate, or the mixed liquid M2 placed in the mold). be able to.
- the temperature of the drying treatment is not particularly limited, and is, for example, 30°C or higher, and may be 50°C to 110°C.
- the drying treatment time is, for example, 1 minute or longer, and may be 5 minutes or longer.
- the thickness of the separation functional layer 1 is, for example, 500 ⁇ m or less, preferably 300 ⁇ m or less, may be 100 ⁇ m or less, may be 50 ⁇ m or less, may be 25 ⁇ m or less, or may be 15 ⁇ m or less. 10 ⁇ m or less, 5.0 ⁇ m or less, or 2.0 ⁇ m or less.
- the thickness of the separation functional layer 1 may be 0.05 ⁇ m or more, or may be 0.1 ⁇ m or more.
- the breaking strength of the separation functional layer 1 is, for example, 80 kPa or more, preferably 200 kPa or more, and more preferably 500 kPa or more. more preferably 700 kPa or more, and may be 900 kPa or more.
- the upper limit of the breaking strength of the separation functional layer 1 is not particularly limited, and is, for example, 2000 kPa, and may be 1200 kPa.
- breaking strength means tensile breaking stress ⁇ b defined in JIS K7161-1:2014.
- the ratio of the weight of the ionic liquid L leaking from the separation functional layer 1 when the separation functional layer 1 is subjected to a compression test to the weight of the ionic liquid L contained in the separation functional layer 1 is, for example, 3. 5 wt% or less, 3.0 wt% or less, 2.5 wt% or less, 2.0 wt% or less, 1.5 wt% or less, 1.0 wt% or less, 0.5 wt% or less, or even 0.1 wt% or less Preferably.
- the ionic liquid L does not have to substantially leak from the separation functional layer 1 .
- the compression test is performed by applying a compression load of 1.16 MPa to the separation function layer 1 for 2 minutes. At this time, the direction in which the compressive load is applied coincides with the thickness direction of the separation functional layer 1 .
- the compression test is performed at room temperature (25°C).
- the separation functional layer 1 can preferentially permeate the acid gas contained in the mixed gas.
- the carbon dioxide permeation coefficient C1 for the separation functional layer 1 is, for example, 500 Barrers or more, preferably 700 Barrers or more, may be 900 Barrers or more, or may be 1000 Barrers or more.
- the upper limit of the permeability coefficient C1 is not particularly limited, and is, for example, 3000 Barrer.
- Barrer means 10 ⁇ 10 ⁇ cm 3 (STP) ⁇ cm/(sec ⁇ cm 2 ⁇ cmHg).
- cm 3 (STP) means the volume of carbon dioxide at 1 atmosphere and 0°C.
- the transmission coefficient C1 can be calculated by the following method. First, a mixed gas containing carbon dioxide and nitrogen is supplied to the space adjacent to one surface of the separation functional layer 1, and the pressure of the space adjacent to the other surface of the separation functional layer 1 is reduced. As a result, the permeated fluid that has permeated the separation function layer 1 is obtained. The weight of the permeate and the volume fraction of carbon dioxide and nitrogen in the permeate are measured. The transmission coefficient C1 can be calculated from the measurement results. In the above operation, the concentration of carbon dioxide in the gas mixture is 50 vol% under standard conditions (0°C, 101 kPa). The mixed gas supplied to the space adjacent to one surface of the separation functional layer 1 has a temperature of 30° C. and a pressure of 0.1 MPa. The space adjacent to the other surface of the separation functional layer 1 is decompressed so that the pressure in the space is 0.1 MPa lower than the atmospheric pressure in the measurement environment.
- the separation coefficient ⁇ 1 of carbon dioxide with respect to nitrogen of the separation functional layer 1 is not particularly limited, and is, for example, 10 or more, preferably 20 or more, and more preferably 25 or more. .
- the upper limit of the separation factor ⁇ 1 is not particularly limited, and is 100, for example.
- the application of the separation functional layer 1 of the present embodiment includes the application of separating acidic gas from a mixed gas containing acidic gas.
- the acid gas of the mixed gas includes carbon dioxide, hydrogen sulfide, carbonyl sulfide, sulfur oxides (SOx), hydrogen cyanide, nitrogen oxides (NOx), etc. Carbon dioxide is preferred.
- the mixed gas contains other gases than acid gas. Other gases include, for example, hydrogen, non-polar gases such as nitrogen, and inert gases such as helium, preferably nitrogen.
- the separation functional layer 1 of this embodiment is suitable for separating carbon dioxide from a mixed gas containing carbon dioxide and nitrogen.
- the application of the separation functional layer 1 is not limited to the application of separating acid gas from the mixed gas.
- the separation membrane 10 of this embodiment includes the separation function layer 1 described above, and further includes, for example, an intermediate layer 2 and a porous support 3 .
- a porous support 3 supports the separation functional layer 1 .
- the intermediate layer 2 is arranged between the separation functional layer 1 and the porous support 3 and is in direct contact with the separation functional layer 1 and the porous support 3 respectively.
- the intermediate layer 2 contains, for example, a resin and further contains nanoparticles dispersed in the resin (matrix).
- the nanoparticles may be spaced apart from each other within the matrix or may be partially aggregated.
- the intermediate layer 2 may not contain nanoparticles, and may be substantially composed of resin.
- the material of the matrix is not particularly limited, and examples thereof include silicone resins such as polydimethylsiloxane; fluorine resins such as polytetrafluoroethylene; epoxy resins such as polyethylene oxide; polyimide resins; polyacetylene resins such as; and polyolefin resins such as polymethylpentene.
- the matrix preferably contains a silicone resin.
- the nanoparticles may contain inorganic materials or organic materials.
- Inorganic materials included in nanoparticles include, for example, silica, titania, and alumina.
- the nanoparticles preferably contain silica.
- the nanoparticles may have surfaces modified with modifying groups containing carbon atoms. Nanoparticles having surfaces modified with this modifying group are excellent in dispersibility in a matrix.
- the nanoparticles are for example silica nanoparticles which may have their surfaces modified by modifying groups.
- the modifying group further comprises, for example, a silicon atom.
- the surfaces modified with modifying groups are represented by the following formulas (I) to (III), for example.
- R 6 to R 11 in formulas (I) to (III) are each independently a hydrocarbon group which may have a substituent.
- the number of carbon atoms in the hydrocarbon group is not particularly limited as long as it is 1 or more.
- the number of carbon atoms in the hydrocarbon group may be, for example, 25 or less, 20 or less, 10 or less, or 5 or less. In some cases, the hydrocarbon group may have more than 25 carbon atoms.
- the hydrocarbon group may be a linear or branched chain hydrocarbon group, or an alicyclic or aromatic cyclic hydrocarbon group. In one preferred form, the hydrocarbon group is a linear or branched alkyl group having 1 to 8 carbon atoms.
- a hydrocarbon group is, for example, a methyl group or an octyl group, preferably a methyl group.
- Substituents of hydrocarbon groups include, for example, amino groups and acyloxy groups.
- Examples of acyloxy groups include (meth)acryloyloxy groups.
- the hydrocarbon group optionally having substituents described above for R 6 to R 11 in formulas (I) to (III) is represented by formula (IV) below.
- a nanoparticle having a surface modified with a modifying group containing a hydrocarbon group represented by formula (IV) is suitable for improving the acidic gas permeation rate in the separation membrane 10 .
- R 12 is an optionally substituted alkylene group having 1 to 5 carbon atoms.
- the alkylene group may be linear or branched.
- Examples of the alkylene group include methylene group, ethylene group, propane-1,3-diyl group, butane-1,4-diyl group and pentane-1,5-diyl group, preferably propane-1,3 - is a diyl group.
- Examples of substituents for the alkylene group include an amido group and an aminoalkylene group.
- R 13 is an optionally substituted alkyl group having 1 to 20 carbon atoms or an aryl group.
- Alkyl groups may be linear or branched. Examples of the alkyl group and the aryl group include those described above for the ionic liquid L. Substituents for the alkyl group and aryl group include an amino group and a carboxyl group.
- R 13 is, for example, a 3,5-diaminophenyl group.
- the surface modified with a modifying group is preferably represented by the following formula (V).
- Modifying groups are not limited to the structures shown in formulas (I)-(III).
- the modifying group may contain a polymer chain having a polyamide structure or a polydimethylsiloxane structure in place of R 6 to R 11 in formulas (I) to (III).
- the polymer chain is directly attached to a silicon atom.
- the shape of the polymer chain includes, for example, linear, dendrimer, and hyperbranched.
- the method of modifying the surface of nanoparticles with modifying groups is not particularly limited.
- the surface of nanoparticles can be modified by reacting hydroxyl groups present on the surface of the nanoparticles with a known silane coupling agent.
- the modifying group contains a polyamide structure
- the surface of the nanoparticles can be modified, for example, by the method disclosed in JP-A-2010-222228.
- the average particle size of the nanoparticles is not particularly limited as long as it is on the order of nanometers ( ⁇ 1000 nm), and is, for example, 100 nm or less, preferably 50 nm or less, and more preferably 20 nm or less.
- the lower limit of the average particle size of nanoparticles is, for example, 1 nm.
- the average particle size of nanoparticles can be specified, for example, by the following method. First, a cross section of the intermediate layer 2 is observed with a transmission electron microscope. In the obtained electron microscope image, the area of specific nanoparticles is calculated by image processing. The diameter of a circle having the same area as the calculated area is taken as the particle size (particle diameter) of that particular nanoparticle.
- the particle size of an arbitrary number (at least 50) of nanoparticles is calculated, and the average value of the calculated values is regarded as the average particle size of the nanoparticles.
- the shape of the nanoparticles is not particularly limited, and may be spherical, ellipsoidal, scaly, or fibrous.
- the content of nanoparticles in the intermediate layer 2 is, for example, 5 wt% or more, preferably 10 wt% or more, and more preferably 15 wt% or more.
- the upper limit of the content of nanoparticles in the intermediate layer 2 is not particularly limited, and is, for example, 30 wt %.
- the thickness of the intermediate layer 2 is not particularly limited, and is, for example, less than 50 ⁇ m, preferably 40 ⁇ m or less, more preferably 30 ⁇ m or less.
- the lower limit of the thickness of the intermediate layer 2 is not particularly limited, and is, for example, 1 ⁇ m.
- the intermediate layer 2 is, for example, a layer having a thickness of less than 50 ⁇ m.
- porous support 3 supports the separation functional layer 1 with the intermediate layer 2 interposed therebetween.
- Porous support 3 includes, for example, nonwoven fabric; porous polytetrafluoroethylene; aromatic polyamide fiber; porous metal; sintered metal; porous ceramic; silicone; silicone rubber; permeation containing at least one selected from the group consisting of polyvinyl fluoride, polyvinylidene fluoride, polyurethane, polypropylene, polyethylene, polystyrene, polycarbonate, polysulfone, polyetheretherketone, polyacrylonitrile, polyimide and polyphenylene oxide open-celled or closed-celled metal foams; open-celled or closed-celled polymeric foams; silica; porous glass;
- the porous support 3 may be a combination of two or more of these.
- the porous support 3 may be a laminate of a nonwoven fabric and a polysulfone porous layer.
- the porous support 3 has an average pore size of, for example, 0.01-0.4 ⁇ m.
- the thickness of the porous support 3 is not particularly limited, and is, for example, 10 ⁇ m or more, preferably 20 ⁇ m or more, more preferably 50 ⁇ m or more.
- the thickness of the porous support 3 is, for example, 300 ⁇ m or less, preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less.
- Separation membrane 10 can be produced, for example, by the following method.
- a coating liquid containing the material of the intermediate layer 2 is applied onto the porous support 3 to form a coating film.
- a method for applying the coating liquid is not particularly limited, and for example, a spin coating method, a dip coating method, or the like can be used.
- the coating liquid may be applied using a wire bar or the like.
- the coating film is dried to form the intermediate layer 2 .
- the coating film can be dried, for example, under heating conditions.
- the heating temperature of the coating film is, for example, 50° C. or higher.
- the heating time of the coating film is, for example, 1 minute or longer, and may be 5 minutes or longer.
- the surface of the intermediate layer 2 may be subjected to an adhesion-facilitating treatment as necessary.
- the adhesion-facilitating treatment includes surface treatment such as application of a primer, corona discharge treatment, and plasma treatment.
- the mixture M1 (or the mixture M2) for forming the separation functional layer 1 is applied onto the intermediate layer 2 in the laminate of the porous support 3 and the intermediate layer 2 .
- the prepolymer is reacted with the cross-linking agent by the method described above, or the coating film is dried.
- the separation functional layer 1 is formed on the intermediate layer 2, and the separation membrane 10 can be obtained.
- the strength of the separation function layer 1 is improved in this embodiment. Therefore, the separation functional layer 1 can also be formed on the intermediate layer 2 by a roll-to-roll method.
- the method for producing the separation membrane 10 is not limited to the above method.
- the separation membrane 10 may be produced by the following method. First, the separation functional layer 1 formed on a substrate such as a release liner is prepared by the method described above. Next, the intermediate layer 2 is formed by applying a coating liquid containing the material of the intermediate layer 2 onto the separation functional layer 1 and drying it. A laminate of the intermediate layer 2 and the separation functional layer 1 is transferred to the porous support 3 . Thereby, the separation membrane 10 is obtained.
- the separation membrane 10 of the present embodiment can preferentially permeate the acid gas contained in the mixed gas.
- the permeation rate T of carbon dioxide permeating through the separation membrane 10 is, for example, 10 GPU or more, preferably 50 GPU or more, more preferably 100 GPU or more, still more preferably 150 GPU or more, or 200 GPU or more. may be 300 GPUs or more.
- the upper limit of the transmission speed T is not particularly limited, and is, for example, 1000 GPU.
- GPU means 10 ⁇ 6 ⁇ cm 3 (STP)/(sec ⁇ cm 2 ⁇ cmHg).
- the permeability coefficient C2 of carbon dioxide with respect to the separation membrane 10 is, for example, 100 Barrer or more, preferably 500 Barrer or more, more preferably 1000 Barrer or more, and may be 1100 Barrer or more.
- the upper limit of the permeability coefficient C2 is not particularly limited, and is, for example, 3000 Barrer.
- the transmission rate T and the transmission coefficient C2 can be measured by the method described above for the transmission coefficient C1 of the separation functional layer 1.
- the mixed gas of carbon dioxide and nitrogen is supplied, for example, to the space adjacent to the main surface 11 of the separation membrane 10 on the side of the separation functional layer. Furthermore, the space adjacent to the main surface 12 of the separation membrane 10 on the porous support side is decompressed.
- the separation coefficient ⁇ 2 of carbon dioxide with respect to nitrogen of the separation membrane 10 is not particularly limited, and is, for example, 10 or more, preferably 20 or more, and more preferably 25 or more. be.
- the upper limit of the separation factor ⁇ 2 is not particularly limited, and is 100, for example.
- the separation factor ⁇ 2 can be calculated by the method described above for the separation factor ⁇ 1.
- the separation factor ⁇ 2 of the separation membrane 10 tends to hardly decrease.
- the reduction rate of the separation coefficient ⁇ 2 of carbon dioxide with respect to nitrogen is, for example, 20% or less, preferably 10% or less, and more preferably 5%. It is below.
- the lower limit of the rate of decrease of the separation factor ⁇ 2 is not particularly limited, and is, for example, 0.5%.
- the decrease rate of the separation factor ⁇ 2 can be calculated from the following formula based on the separation factor ⁇ 2 before of the separation membrane 10 before the press test and the separation factor ⁇ 2 after of the separation membrane 10 after the press test.
- the separation coefficient ⁇ 2 of the separation membrane 10 correlates with the separation coefficient ⁇ 1 of the separation function layer 1 . Therefore, the decrease rate of the separation coefficient ⁇ 2 in the separation membrane 10 can be regarded as the decrease rate of the separation coefficient ⁇ 1 in the separation function layer 1.
- Reduction rate of separation factor ⁇ 2 (%) 100 ⁇ ( ⁇ 2 before - ⁇ 2 after ) / ⁇ 2 before
- the press test for the separation membrane 10 is performed by the following method.
- the separation membrane 10 is arranged on a glass plate 50 having a thickness of 1 mm.
- the porous support 3 of the separation membrane 10 is brought into contact with the glass plate 50 .
- the separation membrane 10 placed on the glass plate 50 has, for example, a main surface area of 100 cm 2 and a rectangular shape in plan view.
- a laminate of nonwoven fabric 15 and porous membrane 16 is arranged on separation functional layer 1 of separation membrane 10 .
- Porous membrane 16 is typically a polysulfone porous membrane.
- the nonwoven fabric 15 is made of PET, for example.
- the laminate of the nonwoven fabric 15 and the porous membrane 16 may have the same structure as the porous support 3 of the separation membrane 10 .
- the obtained laminate is sandwiched between a pair of test plates 51a and 51b.
- the test plates 51a and 51b are, for example, 2 mm thick and made of silicone rubber.
- a press test is performed by applying a compressive load of 5 N/cm 2 to the separation membrane 10 through the test plates 51a and 51b for 1 hour. At this time, the direction in which the compressive load is applied coincides with the thickness direction of the separation membrane 10 .
- the press test is performed at room temperature (25°C). After the press test, the laminate of the test plate 51b, the porous membrane 16 and the nonwoven fabric 15 is peeled off from the separation membrane 10, as shown in FIG. 3B.
- the membrane separation device 100 of this embodiment includes a separation membrane 10 and a tank 20 .
- the separation functional layer 1 can be used alone.
- the tank 20 has a first chamber 21 and a second chamber 22 .
- Separation membrane 10 is arranged inside tank 20 . Inside the tank 20 , the separation membrane 10 separates the first chamber 21 and the second chamber 22 . Separation membrane 10 extends from one of a pair of wall surfaces of tank 20 to the other.
- the first chamber 21 has an entrance 21a and an exit 21b.
- the second chamber 22 has an outlet 22a.
- Each of the inlet 21a, the outlet 21b, and the outlet 22a is an opening formed in the wall surface of the tank 20, for example.
- Membrane separation using the membrane separation device 100 is performed, for example, by the following method.
- a mixed gas 30 containing acid gas is supplied to the first chamber 21 through the inlet 21a.
- the concentration of the acid gas in the mixed gas 30 is not particularly limited, and is, for example, 0.01 vol% (100 ppm) or more, preferably 1 vol% or more, more preferably 10 vol% or more, and even more preferably, under standard conditions. is 30 vol% or more, particularly preferably 50 vol% or more.
- the upper limit of the acid gas concentration in the mixed gas 30 is not particularly limited, and is, for example, 90 vol % under standard conditions.
- the membrane separation device 100 may further include a pump (not shown) for pressurizing the mixed gas 30 .
- the pressure of the mixed gas 30 supplied to the first chamber 21 is, for example, 0.1 MPa or higher, preferably 0.3 MPa or higher.
- the pressure in the second chamber 22 may be reduced while the mixed gas 30 is supplied to the first chamber 21 .
- the membrane separation device 100 may further include a pump (not shown) for reducing the pressure inside the second chamber 22 .
- the second chamber 22 may be depressurized such that the space inside the second chamber 22 is, for example, 10 kPa or more, preferably 50 kPa or more, and more preferably 100 kPa or more less than the atmospheric pressure in the measurement environment.
- a permeate fluid 35 having a higher acid gas content than the mixed gas 30 can be obtained on the other side of the separation membrane 10 . That is, the permeating fluid 35 is supplied to the second chamber 22 .
- the permeating fluid 35 contains, for example, acid gas as a main component. However, the permeating fluid 35 may contain a small amount of gas other than the acid gas.
- the permeated fluid 35 is discharged to the outside of the tank 20 through the outlet 22a.
- the concentration of acid gas in the mixed gas 30 gradually decreases from the inlet 21a of the first chamber 21 toward the outlet 21b.
- the mixed gas 30 (non-permeating fluid 36) processed in the first chamber 21 is discharged to the outside of the tank 20 through the outlet 21b.
- the membrane separation device 100 of this embodiment is suitable for a flow-type (continuous) membrane separation method.
- the membrane separation apparatus 100 of this embodiment may be used for a batch-type membrane separation method.
- the membrane separation device 110 of this embodiment includes a central tube 41 and a laminate 42 .
- a laminate 42 includes the separation membrane 10 .
- the laminate 42 may include the separation functional layer 1 alone instead of the separation membrane 10 .
- the membrane separation device 110 is a spiral membrane element.
- the central tube 41 has a cylindrical shape. A plurality of holes are formed on the surface of the central tube 41 to allow the permeating fluid 35 to flow into the central tube 41 .
- materials for the central tube 41 include resins such as acrylonitrile-butadiene-styrene copolymer resin (ABS resin), polyphenylene ether resin (PPE resin), and polysulfone resin (PSF resin); and metals such as stainless steel and titanium. be done.
- the inner diameter of the central tube 41 is, for example, in the range of 20-100 mm.
- the laminate 42 further includes, in addition to the separation membrane 10, a feed-side channel material 43 and a permeate-side channel material 44.
- the laminate 42 is wound around the central tube 41 .
- the membrane separation device 110 may further include an exterior material (not shown).
- a resin net made of polyphenylene sulfide (PPS) or ethylene-chlorotrifluoroethylene copolymer (ECTFE) can be used.
- the membrane separation device 110 stress is applied to the separation membrane 10 in contact with the feed side channel material 43 and the permeate side channel material 44.
- the separation membrane 10 since the strength of the separation functional layer 1 is improved, the characteristics of the separation membrane 10 are hardly degraded by the above stress.
- the separation coefficient ⁇ 2 of the separation membrane 10 hardly decreases before and after the membrane separation device 110 is manufactured.
- Membrane separation using the membrane separation device 110 is performed, for example, by the following method.
- the permeated fluid 35 that permeates the separation membrane 10 of the laminate 42 moves inside the central tube 41 .
- the permeating fluid 35 is discharged outside through the central tube 41 .
- the mixed gas 30 (non-permeating fluid 36) processed by the membrane separation device 110 is discharged outside from the other end of the wound laminate 42. As shown in FIG. Thereby, the acid gas can be separated from the mixed gas 30 .
- the solution after polymerization was transferred to an eggplant flask and treated with an evaporator at 60°C for 30 minutes or longer to remove 1,4-dioxane from the solution.
- THF was added to the eggplant flask to dissolve the white solid.
- the resulting solution was dropped drop by drop into hexane cooled to -10°C while stirring to obtain a precipitate.
- a prepolymer (poly(DMAAm-co-NSA)) was obtained by treating the precipitate in a constant temperature bath at 30° C. under a vacuum atmosphere for 24 hours.
- silica particles (Aerosil 200), the above prepolymer (poly (DMAAm-co-NSA)), diethylene glycol bis (3-aminopropyl) ether as a prepolymer cross-linking agent, 1-ethyl-3 as an ionic liquid -Methylimidazolium dicyanamide ([EMIM][DCA]) and ethanol were mixed and stirred at room temperature for 1 minute. As a result, a mixed liquid for forming the separation functional layer was obtained. In the mixture, the weight ratio of silica particles, prepolymer and ionic liquid was 5:15:80.
- the ratio of the substance amount of the cross-linking agent to the prepolymer was 2.5 mol %.
- the ratio of the amount of cross-linking agent to the total number of cross-linking points contained in the prepolymer was 50 mol %.
- the decane solution was applied using a bar coater under the conditions of a coating thickness of 45.7 ⁇ m.
- the obtained coating film was dried at 130° C. for 5 minutes.
- the thickness of the intermediate layer was 2 ⁇ m.
- Comparative example 2 No silica particles were used, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM][Tf 2 N]) was used as the ionic liquid, and prepolymer and A separation functional layer (self-supporting membrane) and a separation membrane (composite membrane) of Comparative Example 2 were produced in the same manner as in Comparative Example 1, except that the weight ratio of the ionic liquid was changed to 20:80.
- EMIM 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide
- Example 1 [Preparation of Separation Functional Layer]
- polymer A a copolymer of vinylidene fluoride and hexafluoropropylene (PVDF-co-HFP, No. 427160-100G manufactured by Sigma-Aldrich) was prepared.
- PVDF-co-HFP can form crystalline structures in ionic liquids such as [EMIM][Tf 2 N], [EMIM][DCA], [EMIM][FSI].
- polymer A was added to acetone and stirred for 3 hours.
- the above prepolymer (poly(DMAAm-co-NSA)) was added to the resulting mixture and stirred for 1 hour.
- [EMIM][Tf 2 N] was added as an ionic liquid to this mixture, and the mixture was stirred for 30 minutes. Further, diethylene glycol bis(3-aminopropyl) ether was added as a cross-linking agent to this mixed solution and stirred for 3 minutes.
- a mixed solution M1 for forming a separation functional layer was produced.
- the weight ratio of polymer A, prepolymer and ionic liquid was 5:15:80.
- the concentration of non-volatile components in the mixed liquid M1 was 39 wt %.
- the total concentration of the polymer A and the components forming the polymer B (prepolymer and cross-linking agent) was 8 wt %.
- the ratio of the substance amount of the cross-linking agent to the prepolymer was 2.5 mol %.
- the ratio of the amount of cross-linking agent to the total number of cross-linking points contained in the prepolymer was 50 mol %.
- the resulting mixture M1 was placed in a PTFE mold (petri dish) and dried in a dryer at 70°C.
- polymer B was formed by the reaction of the prepolymer and the cross-linking agent, and the separation functional layer (self-supporting membrane) of Example 1 was obtained. This self-supporting film was peeled off from the mold and used.
- Polymer A and polymer B formed an IPN structure.
- Example 1 [Preparation of Separation Membrane] Next, using a spin coater, the mixed liquid M1 was applied onto the laminate of the porous support and the intermediate layer under the conditions of 2000 rpm and 20 seconds, and the resulting coating film was heated to 60°C.
- a separation membrane (composite membrane) of Example 1 was produced by the same method as the above separation functional layer production method, except that it was dried for 5 minutes.
- the laminate of the porous support and the intermediate layer the one described in Comparative Example 1 was used.
- Example 4 In the mixed liquid M1, the separation functional layer (self-supporting membrane) and the separation membrane (composite membrane) of Example 4 were prepared in the same manner as in Example 2, except that the types of prepolymer and cross-linking agent were changed as shown in Table 1. ).
- an epoxy-based cross-linking agent manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "Tetrad C", 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane was used as the cross-linking agent. board.
- Example 5 The separation functional layer (self-supporting membrane) and separation A membrane (composite membrane) was obtained.
- Comparative Example 3 The separation functional layer (self-supporting membrane) and the separation membrane (composite membrane) of Comparative Example 3 were prepared in the same manner as in Comparative Example 2, except that the above PVDF-co-HFP was used instead of the prepolymer and cross-linking agent. made.
- Example 6 to 10 were prepared in the same manner as in Example 2, except that the weight ratio of the polymer A, prepolymer and ionic liquid in the mixture M1 and the type of ionic liquid were changed as shown in Table 2. A separation functional layer (self-supporting membrane) and a separation membrane (composite membrane) were obtained.
- the permeability coefficient C1 of carbon dioxide and the separation coefficient ⁇ 1 of carbon dioxide with respect to nitrogen (CO 2 /N 2 ) were measured by the following methods.
- the separation functional layer was set in a metal cell and sealed with an O-ring to prevent leakage.
- the mixed gas was injected into the metal cell so that the mixed gas was in contact with one main surface of the separation function layer.
- the gas mixture consisted essentially of carbon dioxide and nitrogen.
- the concentration of carbon dioxide in the mixed gas was 50 vol% under standard conditions.
- the gas mixture injected into the metal cell had a temperature of 30° C. and a pressure of 0.1 MPa.
- the space in the metal cell adjacent to the other main surface of the separation functional layer was evacuated with a vacuum pump. At this time, the space was decompressed so that the pressure in the space was 0.1 MPa lower than the atmospheric pressure in the measurement environment. As a result, the permeated fluid was obtained from the other main surface of the separation functional layer.
- the permeability coefficient C1 and the separation coefficient ⁇ 1 were calculated based on the obtained composition of the permeated fluid, the weight of the permeated fluid, and the like. Results are shown in Tables 1 and 2.
- the separation functional layer and the separation membrane of the present embodiment are suitable for separating acid gas from mixed gas containing acid gas.
- the separation functional layer and separation membrane of this embodiment are suitable for separating carbon dioxide from off-gases of chemical plants or thermal power plants.
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Abstract
Description
イオン液体と、
前記イオン液体中で結晶構造を形成するポリマーAと、
前記ポリマーAとは異なるポリマーBと、
を含む、分離機能層を提供する。
イオン液体と、
フッ素系ポリマーであるポリマーAと、
前記ポリマーAとは異なるポリマーBと、
を含む、分離機能層を提供する。
イオン液体と、前記イオン液体中で結晶構造を形成するポリマーAと、前記ポリマーAとは異なるポリマーBと、を含む分離機能層の製造方法であって、
下記の工程(i)及び工程(ii)からなる群より選ばれる少なくとも1つを含む、分離機能層の製造方法を提供する。
工程(i):前記イオン液体、前記ポリマーA、プレポリマー及び架橋剤を含む混合液M1において、前記ポリマーBが形成されるように、前記プレポリマーを前記架橋剤と反応させる。
工程(ii):前記イオン液体、前記ポリマーA、及び前記ポリマーBを含む混合液M2を乾燥させる。
イオン液体と、
前記イオン液体中で結晶構造を形成するポリマーAと、
前記ポリマーAとは異なるポリマーBと、
を含む。
イオン液体と、
フッ素系ポリマーであるポリマーAと、
前記ポリマーAとは異なるポリマーBと、
を含む。
第1~第14態様のいずれか1つにかかる分離機能層と、
前記分離機能層を支持している多孔性支持体と、
を備える。
ここで、前記プレス試験は、前記分離膜に対して5N/cm2の圧縮荷重を1時間加えることによって行う。
イオン液体と、前記イオン液体中で結晶構造を形成するポリマーAと、前記ポリマーAとは異なるポリマーBと、を含む分離機能層の製造方法であって、
下記の工程(i)及び工程(ii)からなる群より選ばれる少なくとも1つを含む。
工程(i):前記イオン液体、前記ポリマーA、プレポリマー及び架橋剤を含む混合液M1において、前記ポリマーBが形成されるように、前記プレポリマーを前記架橋剤と反応させる。
工程(ii):前記イオン液体、前記ポリマーA、及び前記ポリマーBを含む混合液M2を乾燥させる。
図1は、本実施形態の分離機能層1の断面図である。分離機能層1は、イオン液体Lと、イオン液体L中で結晶構造を形成するポリマーAと、ポリマーAとは異なるポリマーBと、を含んでいる。詳細には、ポリマーA及びポリマーBは、互いに異なる組成を有する。本明細書において、イオン液体は、25℃で液体の塩(イオン性化合物)を意味する。
分離機能層1に含まれるイオン液体Lは、例えば、イミダゾリウムイオン、ピリジニウムイオン、アンモニウムイオン及びホスホニウムイオンからなる群より選ばれる少なくとも1つを含み、好ましくはイミダゾリウムイオンを含む。これらのイオンは、例えば、炭素数1以上の置換基を含む。
上述のとおり、ポリマーAは、イオン液体L中で結晶構造を形成する。言い換えると、ポリマーAは、イオン液体L中で結晶化する。イオン液体Lにおいて、ポリマーA全体が結晶化してもよく、ポリマーAが部分的に結晶化してもよい。「ポリマーAがイオン液体L中で結晶構造を形成する」とは、室温(25℃)で、ポリマーA及びイオン液体Lを含む試料に対してX線回折(XRD)測定を行った場合に、ポリマーAの結晶構造に由来するピークが確認できることを意味する。XRD測定に用いる試料は、5gのイオン液体L及び10.24gのアセトンからなる混合液体に1.3gのポリマーAを溶解させ、得られた溶液を30℃で24時間乾燥させた後に、さらに70℃で24時間乾燥させることによって調製する。溶液の乾燥は、例えば、ポリテトラフルオロエチレン(PTFE)製のシャーレを用いて行うことができる。
イオン液体Lと、
フッ素系ポリマーであるポリマーAと、
ポリマーAとは異なるポリマーBと、
を含む、分離機能層1を提供する。
イオン液体Lと、
融点が130℃以上のポリマーAと、
架橋構造を有するポリマーBと、
を含む、分離機能層1を提供する。
ポリマーBは、ポリマーAと異なる限り、特に限定されない。ポリマーBは、架橋構造を有していなくてもよいが、架橋構造を有することが好ましい。ポリマーBが有する架橋構造は、例えば、化学的架橋構造である。言い換えると、ポリマーBは、例えば、プレポリマーの架橋物である。本明細書では、ポリマーBを単に架橋物と呼ぶことがある。ポリマーBが架橋構造を有することは、例えば、ポリマーBのゲル分率を測定することによって判断することができる。ポリマーBは、例えば、イオン液体L中で結晶構造を形成しない。言い換えると、ポリマーBは、ポリマーAと比べて、イオン液体Lに対する溶解性が高い。
ポリマーBを形成するためのプレポリマーは、モノマーに由来する構成単位を含むポリマー鎖を有する。このポリマー鎖は、例えば、モノマーがラジカル重合することによって形成されている。プレポリマーの架橋物では、複数のポリマー鎖が架橋鎖によって架橋されている。ポリマー鎖と架橋鎖とは、ヒドラゾン結合、アミド結合、イミド結合、ウレタン結合、エーテル結合及びエステル結合からなる群より選ばれる少なくとも1種の結合により結合されていることが好ましい。
ポリマーBは、例えば、プレポリマーと架橋剤との反応によって形成することができる。ただし、プレポリマーが架橋剤として機能する構成単位を含む場合、ポリマーBは、プレポリマー同士の反応によって形成することができる。架橋剤は、プレポリマーの組成などに応じて適宜選択することができる。架橋剤としては、例えば、多官能(メタ)アクリレート、ヒドラジド系架橋剤、アミン系架橋剤、イソシアネート系架橋剤、エポキシ系架橋剤、アジリジン系架橋剤、メラミン系架橋剤、金属キレート系架橋剤、金属塩系架橋剤、過酸化物系架橋剤、オキサゾリン系架橋剤、尿素系架橋剤、カルボジイミド系架橋剤、カップリング剤系架橋剤(例えばシランカップリング剤)等が挙げられる。架橋剤は、1種又は2種以上を組み合わせて使用することができる。ポリマーBは、アミン系架橋剤及びエポキシ系架橋剤からなる群より選ばれる少なくとも1つの架橋剤による架橋物であることが好ましく、アミン系架橋剤による架橋物、詳細にはプレポリマーとアミン系架橋剤との反応物、であることがより好ましい。
分離機能層1の製造方法は、例えば、下記の工程(i)及び工程(ii)からなる群より選ばれる少なくとも1つを含む。
工程(i):イオン液体L、ポリマーA、プレポリマー及び架橋剤を含む混合液M1において、ポリマーBが形成されるように、プレポリマーを架橋剤と反応させる。
工程(ii):イオン液体L、ポリマーA、及びポリマーBを含む混合液M2を乾燥させる。
分離機能層1の厚さは、例えば500μm以下であり、好ましくは300μm以下であり、100μm以下であってもよく、50μm以下であってもよく、25μm以下であってもよく、15μm以下であってもよく、10μm以下であってもよく、5.0μm以下であってもよく、2.0μm以下であってもよい。分離機能層1の厚さは、0.05μm以上であってもよく、0.1μm以上であってもよい。
分離係数α=(YA/YB)/(XA/XB)
本実施形態の分離機能層1の用途としては、酸性ガスを含む混合気体から酸性ガスを分離する用途が挙げられる。混合気体の酸性ガスとしては、二酸化炭素、硫化水素、硫化カルボニル、硫黄酸化物(SOx)、シアン化水素、窒素酸化物(NOx)などが挙げられ、好ましくは二酸化炭素である。混合気体は、酸性ガス以外の他のガスを含んでいる。他のガスとしては、例えば、水素、窒素などの非極性ガス、及び、ヘリウムなどの不活性ガスが挙げられ、好ましくは窒素である。特に、本実施形態の分離機能層1は、二酸化炭素及び窒素を含む混合気体から二酸化炭素を分離する用途に適している。ただし、分離機能層1の用途は、上記の混合気体から酸性ガスを分離する用途に限定されない。
図2に示すように、本実施形態の分離膜10は、上述した分離機能層1を備え、例えば、中間層2及び多孔性支持体3をさらに備えている。多孔性支持体3は、分離機能層1を支持している。中間層2は、分離機能層1と多孔性支持体3との間に配置されており、分離機能層1及び多孔性支持体3のそれぞれに直接接している。
中間層2は、例えば、樹脂を含み、樹脂(マトリクス)に分散したナノ粒子をさらに含む。ナノ粒子は、マトリクス内で互いに離間していてもよく、部分的に凝集していてもよい。ただし、中間層2は、ナノ粒子を含んでいなくてもよく、実質的に樹脂から構成されていてもよい。
多孔性支持体3は、中間層2を介して分離機能層1を支持する。多孔性支持体3としては、例えば、不織布;多孔質ポリテトラフルオロエチレン;芳香族ポリアミド繊維;多孔質金属;焼結金属;多孔質セラミック;多孔質ポリエステル;多孔質ナイロン;活性化炭素繊維;ラテックス;シリコーン;シリコーンゴム;ポリフッ化ビニル、ポリフッ化ビニリデン、ポリウレタン、ポリプロピレン、ポリエチレン、ポリスチレン、ポリカーボネート、ポリスルホン、ポリエーテルエーテルケトン、ポリアクリロニトリル、ポリイミド及びポリフェニレンオキシドからなる群より選ばれる少なくとも1つを含む透過性(多孔質)ポリマー;連続気泡又は独立気泡を有する金属発泡体;連続気泡又は独立気泡を有するポリマー発泡体;シリカ;多孔質ガラス;メッシュスクリーンなどが挙げられる。多孔性支持体3は、これらのうちの2種以上を組み合わせたものであってもよい。一例として、多孔性支持体3は、不織布とポリスルホン多孔質層との積層体であってもよい。
分離膜10は、例えば、次の方法によって作製することができる。まず、多孔性支持体3及び中間層2の積層体を準備する。この積層体は、例えば、次の方法によって作製できる。まず、中間層2の材料を含む塗布液を調製する。次に、多孔性支持体3の上に、中間層2の材料を含む塗布液を塗布し、塗布膜を形成する。塗布液の塗布方法は、特に限定されず、例えば、スピンコート法、ディップコート法などを利用できる。ワイヤーバーなどを利用して塗布液を塗布してもよい。次に、塗布膜を乾燥し、中間層2を形成する。塗布膜の乾燥は、例えば、加熱条件下で行うことができる。塗布膜の加熱温度は、例えば50℃以上である。塗布膜の加熱時間は、例えば1分以上であり、5分以上であってもよい。さらに、中間層2の表面には、必要に応じて易接着処理を施してもよい。易接着処理としては、下塗り剤の塗布、コロナ放電処理、プラズマ処理などの表面処理が挙げられる。
本実施形態の分離膜10は、分離機能層1に起因して、混合気体に含まれる酸性ガスを優先的に透過させることができる。一例として、分離膜10を透過する二酸化炭素の透過速度Tは、例えば10GPU以上であり、好ましくは50GPU以上であり、より好ましくは100GPU以上であり、さらに好ましくは150GPU以上であり、200GPU以上であってもよく、300GPU以上であってもよい。透過速度Tの上限値は、特に限定されず、例えば1000GPUである。なお、GPUは、10-6・cm3(STP)/(sec・cm2・cmHg)を意味する。
分離係数α2の低下率(%)=100×(α2before-α2after)/α2before
図4に示すとおり、本実施形態の膜分離装置100は、分離膜10及びタンク20を備えている。膜分離装置100では、分離膜10に代えて、分離機能層1を単体で使用することも可能である。タンク20は、第1室21及び第2室22を備えている。分離膜10は、タンク20の内部に配置されている。タンク20の内部において、分離膜10は、第1室21と第2室22とを隔てている。分離膜10は、タンク20の1対の壁面の一方から他方まで延びている。
図5に示すとおり、本実施形態の膜分離装置110は、中心管41及び積層体42を備えている。積層体42が分離膜10を含んでいる。積層体42は、分離膜10に代えて、分離機能層1を単体で含んでいてもよい。膜分離装置110は、スパイラル型の膜エレメントである。
まず、三ツ口フラスコに還流管を取り付け、合成装置を組み立てた。三方コックには、真空ポンプ及びN2ボンベをつないだ。真空引きを行うとともに、2分間に1回窒素を供給する動作を1セットとして、合計5セットの窒素置換を行った。窒素置換後、ガラスシリンジを用いて、1,4-ジオキサンを三ツ口フラスコ内に加えた。次に、バイアル瓶に、N,N-ジメチルアクリルアミド(DMAAm)(14.6g、147.28mmol)、N-アクリロイルオキシスクシンイミド(NSA)(1.32g、7.80mmol)及び2,2’-アゾビスイソブチロニトリル(AIBN)(0.256g、1.56mmol)をこの順に量り取り、数分攪拌した。DMAAmとNSAのモル比(DMAAm/NSA)は、95/5であった。シリンジを用いて、得られた混合物を三ツ口フラスコ内に加えた。三ツ口フラスコ内の溶液をスターラーで10分程攪拌した。次に、還流管を冷却装置に接続し、60℃に設定した油浴槽を用いて還流下で24時間重合を行った。
DMAAm及びNSAに代えて、n-ブチルアクリレート(BA)(14.25g、111.18mmol)、n-ブチルメタクリレート(BMA)(14.25g、100.21mmol)、及びアクリル酸(AA)(1.5g、20.82mmol)を用いたことを除き、プレポリマー(poly(DMAAm-co-NSA))と同様の方法によって、プレポリマー(poly(BA/BMA-co-AA))を得た。
DMAAm及びNSAに代えて、メチルメタクリレート(MMA)(30.0g、299.64mmol)を用いたことを除き、プレポリマー(poly(DMAAm-co-NSA))と同様の方法によって、ポリマーB(PMMA)を得た。
[分離機能層の作製]
まず、シリカ粒子(Aerosil 200)、上記のプレポリマー(poly(DMAAm-co-NSA))、プレポリマーの架橋剤としてのジエチレングリコールビス(3-アミノプロピル)エーテル、イオン液体としての1-エチル-3-メチルイミダゾリウムジシアンアミド([EMIM][DCA])、及び、エタノールを混合して、室温で1分間撹拌した。これにより、分離機能層を形成するための混合液を得た。混合液において、シリカ粒子、プレポリマー及びイオン液体の重量比は、5:15:80であった。混合液において、プレポリマーに対する架橋剤の物質量の比率は、2.5モル%であった。プレポリマーに含まれる全架橋点の数に対する架橋剤の物質量の比率は、50モル%であった。
次に、スピンコーターを用いて、2000rpm、20秒の条件で、多孔性支持体及び中間層の積層体の上に混合液を塗布したことを除き、上記の分離機能層の作製方法と同じ方法によって、比較例1の分離膜(複合膜)を作製した。なお、多孔性支持体及び中間層の積層体は、次の方法によって作製した。まず、シリコーン樹脂(モメンティブパフォーマンスマテリアルズ社製YSR3022)の6wt%デカン溶液を多孔性支持体の上に塗布した。多孔性支持体としては、限外ろ過膜(日東電工株式会社製のNTU-3175M)を用いた。デカン溶液の塗布は、バーコーターを用いて塗工厚さ45.7μmの条件で行った。次に、得られた塗布膜を130℃で5分乾燥させた。これにより、多孔性支持体及び中間層の積層体を得た。中間層の厚さは2μmであった。
シリカ粒子を用いなかったこと、イオン液体として1-エチル-3-メチルイミダゾリウムビス(トリフルオロメタンスルホニル)イミド([EMIM][Tf2N])を用いたこと、並びに、混合液におけるプレポリマー及びイオン液体の重量比を20:80に変更したことなどを除き、比較例1と同じ方法によって、比較例2の分離機能層(自立膜)及び分離膜(複合膜)を作製した。
[分離機能層の作製]
まず、ポリマーAとして、フッ化ビニリデンとヘキサフルオロプロピレンとの共重合体(PVDF-co-HFP、Sigma-Aldrich社製のNo.427160-100G)を準備した。上述のとおり、PVDF-co-HFPは、[EMIM][Tf2N]、[EMIM][DCA]、[EMIM][FSI]などのイオン液体中で結晶構造を形成することができる。次に、アセトンにポリマーAを添加し、3時間攪拌した。得られた混合液に、上記のプレポリマー(poly(DMAAm-co-NSA))を添加し、1時間攪拌した。この混合液に、イオン液体として[EMIM][Tf2N]を添加し、30分間攪拌した。さらに、この混合液に、架橋剤としてジエチレングリコールビス(3-アミノプロピル)エーテルを添加し、3分間攪拌した。これにより、分離機能層を形成するための混合液M1を作製した。混合液M1において、ポリマーA、プレポリマー及びイオン液体の重量比は、5:15:80であった。混合液M1における不揮発成分の濃度は、39wt%であった。混合液M1において、ポリマーAの濃度と、ポリマーBを形成する成分(プレポリマー及び架橋剤)の濃度との合計値は、8wt%であった。混合液M1において、プレポリマーに対する架橋剤の物質量の比率は、2.5モル%であった。プレポリマーに含まれる全架橋点の数に対する架橋剤の物質量の比率は、50モル%であった。
次に、スピンコーターを用いて、2000rpm、20秒の条件で、多孔性支持体及び中間層の積層体の上に混合液M1を塗布したこと、及び、得られた塗布膜を60℃の温度で5分間乾燥させたことを除き、上記の分離機能層の作製方法と同じ方法によって、実施例1の分離膜(複合膜)を作製した。多孔性支持体及び中間層の積層体としては、比較例1で上述したものを用いた。
混合液M1におけるポリマーA及びプレポリマーの重量比を表1に示すように変更したことを除き、実施例1と同じ方法によって、実施例2~3の分離機能層(自立膜)及び分離膜(複合膜)を得た。
混合液M1において、プレポリマー及び架橋剤の種類を表1に示すように変更したことを除き、実施例2と同じ方法によって、実施例4の分離機能層(自立膜)及び分離膜(複合膜)を得た。なお、実施例4では、架橋剤として、エポキシ系架橋剤(三菱ガス化学社製、商品名「テトラッドC」、1,3-ビス(N,N-ジグリシジルアミノメチル)シクロへキサン)を用いた。
プレポリマー及び架橋剤に代えて、上記のポリマーB(PMMA)を含む混合液M2を用いたことを除き、実施例2と同様の方法によって、実施例5の分離機能層(自立膜)及び分離膜(複合膜)を得た。
プレポリマー及び架橋剤に代えて、上記のPVDF-co-HFPを用いたことを除き、比較例2と同じ方法によって、比較例3の分離機能層(自立膜)及び分離膜(複合膜)を作製した。
混合液M1におけるポリマーA、プレポリマー及びイオン液体の重量比、並びに、イオン液体の種類などを表2に示すように変更したことを除き、実施例2と同じ方法によって、実施例6~10の分離機能層(自立膜)及び分離膜(複合膜)を得た。
(引張試験)
実施例及び比較例の分離機能層について、上述した方法によって引張試験を行い、破断強度を測定した。結果を表1及び2に示す。
実施例及び比較例の分離機能層について、上述した方法によって圧縮試験を行った。このとき、分離機能層に含まれるイオン液体Lの重量に対する、分離機能層に対して圧縮試験を行ったときに分離機能層から漏洩したイオン液体の重量の比率を特定した。結果を表1及び2に示す。
実施例及び比較例の分離機能層について、以下の方法によって、二酸化炭素の透過係数C1、及び窒素に対する二酸化炭素の分離係数α1(CO2/N2)を測定した。まず、分離機能層を金属セル中にセットし、リークが発生しないようにOリングでシールした。次に、分離機能層の一方の主面に混合気体が接触するように、金属セル内に混合気体を注入した。混合気体は、実質的に二酸化炭素及び窒素からなっていた。混合気体における二酸化炭素の濃度は、標準状態で50vol%であった。金属セル内に注入された混合気体は、温度が30℃であり、圧力が0.1MPaであった。次に、分離機能層の他方の主面に隣接する金属セル内の空間を真空ポンプで減圧した。このとき、この空間は、空間内の圧力が測定環境における大気圧に対して0.1MPa小さくなるように減圧されていた。これにより、分離機能層の他方の主面から透過流体が得られた。得られた透過流体の組成、透過流体の重量などに基づいて、透過係数C1及び分離係数α1を算出した。結果を表1及び2に示す。
(ガス透過試験)
分離機能層について上述した方法によって、実施例及び比較例の分離膜について、二酸化炭素の透過速度T、二酸化炭素の透過係数C2、及び窒素に対する二酸化炭素の分離係数α2(CO2/N2)を測定した。結果を表1及び2に示す。
比較例1及び実施例2の分離膜(複合膜)については、上述のプレス試験を行った。プレス試験の前後での透過速度T及び分離係数α2を表3に示す。さらに、プレス試験を行った後に、分離膜における分離機能層の表面を走査電子顕微鏡で観察した。その結果を図6及び7に示す。
Claims (17)
- イオン液体と、
前記イオン液体中で結晶構造を形成するポリマーAと、
前記ポリマーAとは異なるポリマーBと、
を含む、分離機能層。 - 前記ポリマーAは、フッ素系ポリマーである、請求項1に記載の分離機能層。
- イオン液体と、
フッ素系ポリマーであるポリマーAと、
前記ポリマーAとは異なるポリマーBと、
を含む、分離機能層。 - 前記ポリマーBが架橋構造を有する、請求項1又は3に記載の分離機能層。
- 前記ポリマーA及び前記ポリマーBが相互侵入高分子網目構造を形成している、請求項1又は3に記載の分離機能層。
- 前記ポリマーAは、部分的にフッ素化されたモノマーa1と、全フッ素化されたモノマーa2との共重合体である、請求項1又は3に記載の分離機能層。
- 前記ポリマーAは、フッ化ビニリデンとヘキサフルオロプロピレンとの共重合体である、請求項1又は3に記載の分離機能層。
- 前記ポリマーBは、(メタ)アクリル系ポリマーである、請求項1又は3に記載の分離機能層。
- 前記ポリマーBは、N,N-ジメチルアクリルアミドとN-アクリロイルオキシスクシンイミドとの共重合体に由来する構造、及び、n-ブチル(メタ)アクリレートと(メタ)アクリル酸との共重合体に由来する構造からなる群より選ばれる少なくとも1つを含む、請求項1又は3に記載の分離機能層。
- 前記ポリマーBは、アミン系架橋剤及びエポキシ系架橋剤からなる群より選ばれる少なくとも1つの架橋剤による架橋物である、請求項1又は3に記載の分離機能層。
- 前記イオン液体がイミダゾリウムイオンを含む、請求項1又は3に記載の分離機能層。
- 前記イオン液体は、1-エチル-3-メチルイミダゾリウムビス(トリフルオロメタンスルホニル)イミド、1-エチル-3-メチルイミダゾリウムジシアンアミド、及び1-エチル-3-メチルイミダゾリウムビス(フルオロスルホニル)イミドからなる群より選ばれる少なくとも1つを含む、請求項1又は3に記載の分離機能層。
- 前記イオン液体の含有率が60wt%以上である、請求項1又は3に記載の分離機能層。
- 二酸化炭素及び窒素を含む混合気体から二酸化炭素を分離するために用いられる、請求項1又は3に記載の分離機能層。
- 請求項1又は3に記載の分離機能層と、
前記分離機能層を支持している多孔性支持体と、
を備えた、分離膜。 - プレス試験を行った場合に、窒素に対する二酸化炭素の分離係数αの低下率が20%以下である、請求項15に記載の分離膜。
ここで、前記プレス試験は、前記分離膜に対して5N/cm2の圧縮荷重を1時間加えることによって行う。 - イオン液体と、前記イオン液体中で結晶構造を形成するポリマーAと、前記ポリマーAとは異なるポリマーBと、を含む分離機能層の製造方法であって、
下記の工程(i)及び工程(ii)からなる群より選ばれる少なくとも1つを含む、分離機能層の製造方法。
工程(i):前記イオン液体、前記ポリマーA、プレポリマー及び架橋剤を含む混合液M1において、前記ポリマーBが形成されるように、前記プレポリマーを前記架橋剤と反応させる。
工程(ii):前記イオン液体、前記ポリマーA、及び前記ポリマーBを含む混合液M2を乾燥させる。
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