WO2013094462A1 - 電解コンデンサおよびその製造方法 - Google Patents
電解コンデンサおよびその製造方法 Download PDFInfo
- Publication number
- WO2013094462A1 WO2013094462A1 PCT/JP2012/082006 JP2012082006W WO2013094462A1 WO 2013094462 A1 WO2013094462 A1 WO 2013094462A1 JP 2012082006 W JP2012082006 W JP 2012082006W WO 2013094462 A1 WO2013094462 A1 WO 2013094462A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- conductive polymer
- auxiliary liquid
- boiling point
- conductive auxiliary
- capacitors
- Prior art date
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- 229940068918 polyethylene glycol 400 Drugs 0.000 description 7
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
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- 125000004432 carbon atom Chemical group C* 0.000 description 6
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 6
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 5
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- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 5
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- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 5
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 4
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- LTQBNYCMVZQRSD-UHFFFAOYSA-N (4-ethenylphenyl)-trimethoxysilane Chemical compound CO[Si](OC)(OC)C1=CC=C(C=C)C=C1 LTQBNYCMVZQRSD-UHFFFAOYSA-N 0.000 description 3
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- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
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- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 description 1
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- ORVACBDINATSAR-UHFFFAOYSA-N dimethylaluminum Chemical compound C[Al]C ORVACBDINATSAR-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 description 1
- 238000002296 dynamic light scattering Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- UNXHWFMMPAWVPI-ZXZARUISSA-N erythritol Chemical compound OC[C@H](O)[C@H](O)CO UNXHWFMMPAWVPI-ZXZARUISSA-N 0.000 description 1
- 235000019414 erythritol Nutrition 0.000 description 1
- 229940009714 erythritol Drugs 0.000 description 1
- 238000012869 ethanol precipitation Methods 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- ZLNAFSPCNATQPQ-UHFFFAOYSA-N ethenyl-dimethoxy-methylsilane Chemical compound CO[Si](C)(OC)C=C ZLNAFSPCNATQPQ-UHFFFAOYSA-N 0.000 description 1
- NUFVQEIPPHHQCK-UHFFFAOYSA-N ethenyl-methoxy-dimethylsilane Chemical compound CO[Si](C)(C)C=C NUFVQEIPPHHQCK-UHFFFAOYSA-N 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- NUVBSKCKDOMJSU-UHFFFAOYSA-N ethylparaben Chemical compound CCOC(=O)C1=CC=C(O)C=C1 NUVBSKCKDOMJSU-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002523 gelfiltration Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- OTGHWLKHGCENJV-UHFFFAOYSA-N glycidic acid Chemical compound OC(=O)C1CO1 OTGHWLKHGCENJV-UHFFFAOYSA-N 0.000 description 1
- LHGVFZTZFXWLCP-UHFFFAOYSA-N guaiacol Chemical compound COC1=CC=CC=C1O LHGVFZTZFXWLCP-UHFFFAOYSA-N 0.000 description 1
- LNCPIMCVTKXXOY-UHFFFAOYSA-N hexyl 2-methylprop-2-enoate Chemical compound CCCCCCOC(=O)C(C)=C LNCPIMCVTKXXOY-UHFFFAOYSA-N 0.000 description 1
- LNMQRPPRQDGUDR-UHFFFAOYSA-N hexyl prop-2-enoate Chemical compound CCCCCCOC(=O)C=C LNMQRPPRQDGUDR-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- XLSZMDLNRCVEIJ-UHFFFAOYSA-N methylimidazole Natural products CC1=CNC=N1 XLSZMDLNRCVEIJ-UHFFFAOYSA-N 0.000 description 1
- LXCFILQKKLGQFO-UHFFFAOYSA-N methylparaben Chemical compound COC(=O)C1=CC=C(O)C=C1 LXCFILQKKLGQFO-UHFFFAOYSA-N 0.000 description 1
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- NJTGANWAUPEOAX-UHFFFAOYSA-N molport-023-220-454 Chemical compound OCC(O)CO.OCC(O)CO NJTGANWAUPEOAX-UHFFFAOYSA-N 0.000 description 1
- KBJFYLLAMSZSOG-UHFFFAOYSA-N n-(3-trimethoxysilylpropyl)aniline Chemical compound CO[Si](OC)(OC)CCCNC1=CC=CC=C1 KBJFYLLAMSZSOG-UHFFFAOYSA-N 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- 238000006384 oligomerization reaction Methods 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 description 1
- 229960003742 phenol Drugs 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 229920003214 poly(methacrylonitrile) Polymers 0.000 description 1
- 229920006350 polyacrylonitrile resin Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- LZFIOSVZIQOVFW-UHFFFAOYSA-N propyl 2-hydroxybenzoate Chemical compound CCCOC(=O)C1=CC=CC=C1O LZFIOSVZIQOVFW-UHFFFAOYSA-N 0.000 description 1
- QELSKZZBTMNZEB-UHFFFAOYSA-N propylparaben Chemical compound CCCOC(=O)C1=CC=C(O)C=C1 QELSKZZBTMNZEB-UHFFFAOYSA-N 0.000 description 1
- 235000019423 pullulan Nutrition 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 125000001174 sulfone group Chemical group 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- ADXGNEYLLLSOAR-UHFFFAOYSA-N tasosartan Chemical compound C12=NC(C)=NC(C)=C2CCC(=O)N1CC(C=C1)=CC=C1C1=CC=CC=C1C=1N=NNN=1 ADXGNEYLLLSOAR-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003577 thiophenes Chemical class 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-M toluene-4-sulfonate Chemical compound CC1=CC=C(S([O-])(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-M 0.000 description 1
- FRGPKMWIYVTFIQ-UHFFFAOYSA-N triethoxy(3-isocyanatopropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCN=C=O FRGPKMWIYVTFIQ-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/04—Hybrid capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
- H01G9/0036—Formation of the solid electrolyte layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
- H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
Definitions
- the present invention relates to an electrolytic capacitor using a conductive polymer and a conductive auxiliary liquid in combination, and a method for manufacturing the same.
- the conductive polymer is used as a solid electrolyte of a solid electrolytic capacitor such as a tantalum solid electrolytic capacitor, an aluminum solid electrolytic capacitor, or a niobium solid electrolytic capacitor because of its high conductivity.
- a solid electrolytic capacitor such as a tantalum solid electrolytic capacitor, an aluminum solid electrolytic capacitor, or a niobium solid electrolytic capacitor because of its high conductivity.
- conductive polymer in this application for example, those obtained by chemical oxidative polymerization or electrolytic oxidative polymerization of thiophene or a derivative thereof are used.
- organic sulfonic acid is mainly used as a dopant when performing chemical oxidative polymerization of the above thiophene or a derivative thereof.
- aromatic sulfonic acid is said to be suitable, and transition metal is a transition metal.
- ferric iron is said to be suitable, and usually a ferric salt of aromatic sulfonic acid is used as an oxidizing agent and a dopant in chemical oxidative polymerization of thiophene or a derivative thereof.
- ferric salts of aromatic sulfonic acids it is said that ferric salts of toluene sulfonic acid and ferric salts of methoxybenzene sulfonic acid are particularly useful, and conductive polymers using them. It can be synthesized by mixing those oxidizing agent / dopant with a polymerizable monomer such as thiophene or a derivative thereof, and is reported to be simple and suitable for industrialization (Patent Document 1, Patent Document) 2).
- Patent Document 3 an electrolytic capacitor using a solid electrolyte made of a conductive polymer and an electrolytic solution has been proposed.
- an electrolytic capacitor using an electrolyte solution as described above a solution obtained by dissolving ammonium dicarboxylate such as ammonium adipate in a solvent such as ethylene glycol is used as the electrolyte solution.
- a solution obtained by dissolving ammonium dicarboxylate such as ammonium adipate in a solvent such as ethylene glycol is used as the electrolyte solution.
- an electrolytic capacitor using such an electrolytic solution in combination with a conductive polymer has improved performance as compared with an electrolytic capacitor using only a conductive polymer as an electrolyte, but has a desired high performance. No electrolytic capacitor was obtained.
- an object of the present invention is to provide a high-performance electrolytic capacitor, that is, an electrolytic capacitor having low (small) ESR, excellent heat resistance, and high reliability under high temperature conditions.
- a conductive solution having a conductivity (electrical conductivity) lower than that of a normal electrolyte solution (usually a conductivity of 3 mS / cm or more) in the present invention, this solution is referred to as “conductive auxiliary liquid”.
- conductive auxiliary liquid a conductive solution having a conductivity (electrical conductivity) lower than that of a normal electrolyte solution (usually a conductivity of 3 mS / cm or more) (in the present invention, this solution is referred to as “conductive auxiliary liquid”).
- the present invention comprises a conductive polymer and a conductive auxiliary liquid, wherein the conductive auxiliary liquid has an aromatic solvent having a boiling point of 150 ° C. or higher and an organic solvent having at least one hydroxyl group.
- the present invention relates to an electrolytic capacitor comprising a compound.
- the conductive polymer may be provided using a dispersion of a conductive polymer, or may be synthesized by chemical oxidative polymerization of a monomer at a desired position called “in-situ polymerization”. Good. Therefore, in this application, the manufacturing method of the electrolytic capacitor of the following two aspects is also the object of the invention.
- the present invention includes a step of providing a conductive polymer on a capacitor element having a dielectric layer composed of a valve metal and an oxide film of the valve metal formed on the surface thereof, using a conductive polymer dispersion; Thereafter, an electrolytic capacitor is manufactured through a step of impregnating the capacitor element with a conductive auxiliary liquid containing a high boiling point organic solvent having a boiling point of 150 ° C. or higher and an aromatic compound having at least one hydroxyl group.
- the manufacturing method of the electrolytic capacitor characterized by these.
- the present invention also includes a step of synthesizing a conductive polymer by chemically oxidatively polymerizing a monomer on a capacitor element having a dielectric layer made of a valve metal and a valve metal oxide film formed on the surface of the valve metal.
- the present invention relates to a method for manufacturing an electrolytic capacitor, wherein the electrolytic capacitor is manufactured through a process.
- the capacitor element is provided before the conductive polymer is provided on the capacitor element.
- a process of treating with a cyclic organic compound having at least one hydroxyl group and a high boiling point solvent having a boiling point of 150 ° C. or higher dissolved in an organic solvent, or through a process of providing a conductive polymer in a capacitor element Thereafter, before impregnating with the conductive auxiliary liquid, the capacitor element provided with the conductive polymer is charged with a high boiling point organic solvent having a boiling point of 150 ° C.
- Electrolytic capacitors with better characteristics, such as lower ESR, can be obtained through a process that uses a solution containing less than%. These are also subject to the invention.
- the present invention it is possible to provide an electrolytic capacitor having low ESR, excellent heat resistance, and high reliability under high temperature conditions. That is, the present invention uses a conductive auxiliary liquid having a conductivity lower than that of the electrolytic solution in combination with the conductive polymer, so that the ESR is lower than that in which the electrolytic solution having a high conductivity is used in combination with the conductive polymer, and An electrolytic capacitor having excellent heat resistance and high reliability under high-temperature conditions can be obtained. If the present invention has a high conductivity, a low ESR can be obtained. It was completed by overcoming the common general knowledge in this technical field.
- the largest characteristic part is a conductive auxiliary liquid, and this conductive auxiliary liquid has conductivity and conductivity is lower than that of the electrolytic solution.
- the conductivity of the conductive auxiliary liquid may be lower than the conductivity of the electrolytic solution (about 3 mS / cm or more), but numerically it is preferably 2 mS / cm or less, more preferably 1 mS / cm or less, 600 ⁇ S / cm cm or less is more preferable, 1 ⁇ S / cm or more is preferable, 5 ⁇ S / cm or more is more preferable, and 8 ⁇ S / cm or more is more preferable.
- this conductive auxiliary liquid is not suitable for improving the characteristics of the electrolytic capacitor even if the conductivity is as high as the electrolyte, and contributes to improving the characteristics of the electrolytic capacitor even if the conductivity is too low. Therefore, it is preferable that the conductivity is in the range of 1 ⁇ S / cm to 2 mS / cm as described above.
- the conductivity of the conductive auxiliary liquid is 25 ° C. at a conductivity measuring device (F-55) manufactured by HORIBA, Ltd. (hereinafter simply referred to as “Horiba”). Although it measures, you may measure with the electrical conductivity measuring device equivalent to this.
- F-55 conductivity measuring device manufactured by HORIBA, Ltd.
- the conductive auxiliary liquid comprises a high-boiling organic solvent having a boiling point of 150 ° C. or higher and an aromatic compound having at least one hydroxyl group.
- the boiling point in the high-boiling organic solvent having a boiling point of 150 ° C. or higher refers to the boiling point under 1 atm (that is, 101.25 hPa).
- Examples of the high-boiling organic solvent having a boiling point of 150 ° C. or higher as described above include ⁇ -butyrolactone (boiling point: 203 ° C.), butanediol (boiling point: 230 ° C.), dimethyl sulfoxide (boiling point: 189 ° C.), sulfolane (boiling point).
- Polyethylene glycol may have no boiling point under normal pressure, such as polyethylene glycol 600 and polyethylene glycol 1500 (the number after polyethylene glycol represents molecular weight), but any polyethylene glycol may be used. In the present invention, this polyethylene glycol is also included in the category of a high boiling organic solvent having a boiling point of 150 ° C. or higher because there is no boiling under normal pressure below 150 ° C.
- Such a high-boiling organic solvent having a boiling point of 150 ° C. or higher is used as a solvent for dissolving an aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid in the present invention.
- the use of such a high boiling point organic solvent as a solvent is to suppress an increase in internal pressure in the solder heat resistance test in the short term, and to suppress volatilization of the organic solvent in the long term. Based on the reason.
- any of benzene-based compounds, naphthalene-based compounds, and anthracene-based compounds can be used.
- Specific examples of the benzene-based compounds include, for example, hydroxybenzene carboxylic acid.
- Acid nitrophenol, dinitrophenol, trinitrophenol, aminonitrophenol, hydroxyanisole, hydroxydinitrobenzene, dihydroxydinitrobenzene, alkylhydroxyanisole, hydroxynitroanisole, hydroxynitrobenzenecarboxylic acid (ie, hydroxynitrobenzoic acid), dihydroxynitrobenzene Carboxylic acid (ie dihydroxynitrobenzoic acid), phenol, dihydroxybenzene, trihydroxybenzene, dihydroxybenzene Zencarboxylic acid, trihydroxybenzenecarboxylic acid, hydroxybenzenedicarboxylic acid, dihydroxybenzenedicarboxylic acid, hydroxytoluenecarboxylic acid and the like.
- naphthalene-based compounds include, for example, nitronaphthol, aminonaphthol, dinitronaphthol, hydroxynaphthalene.
- Carboxylic acid, dihydroquinaphthalene carboxylic acid, trihydroxynaphthalene carboxylic acid, hydroxy naphthalene dicarboxylic acid, dihydroxy naphthalene dicarboxylic acid and the like are mentioned.
- Aromatic compound having at least one hydroxyl group an aromatic compound having at least one carboxyl group or an aromatic compound having at least one nitro group is particularly preferable. Is preferably used in combination with an aromatic compound having at least one nitro group. In the case where the aromatic compound having at least one carboxyl group and the aromatic compound having at least one nitro group are used in combination, the ratio of the two is at least one carboxyl group by mass ratio.
- Aromatic compound having: Aromatic compound having at least one nitro group is preferably 1000: 1 to 1: 100, more preferably 50: 1 to 1: 1.
- aromatic compound having at least one carboxyl group examples include hydroxybenzene carboxylic acid, dihydroxybenzene carboxylic acid, hydroxybenzene dicarboxylic acid, dihydroxybenzene dicarboxylic acid, aminohydroxybenzene carboxylic acid, hydroxytoluene as described above.
- Hydroxybenzenecarboxylic acid dihydroxybenzenecarboxylic acid, hydroxytoluenecarboxylic acid, hydroxynitrobe Zenkarubon acid, hydroxynaphthalene carboxylic acid, hydroxyanthracene carboxylic acid.
- aromatic compound having at least one nitro group include, for example, nitrophenol, dinitrophenol, trinitrophenol, hydroxydinitrobenzene, dihydroxydinitrobenzene, hydroxynitroanisole, aminonitrophenol, hydroxy as described above.
- nitrobenzene carboxylic acid ie hydroxynitrobenzoic acid
- dihydroxynitrobenzene carboxylic acid ie dihydroxynitrobenzoic acid
- nitronaphthol dinitronaphthol
- nitrophenol aminonitrophenol
- hydroxynitrobenzene carboxylic acid ie hydroxy Nitrobenzoic acid
- nitronaphthol ie hydroxy Nitrobenzoic acid
- the aromatic auxiliary compound having at least one hydroxyl group is used in the constitution of the conductive auxiliary liquid because the aromatic compound having at least one hydroxyl group assists the electronic conduction of the conductive polymer. This is because of the ability to suppress deterioration of the conductive polymer by the antioxidant action of the aromatic compound.
- a high boiling point organic solvent having a boiling point of 150 ° C. or more serves as a solvent and an aromatic compound having at least one hydroxyl group serves as a solute.
- the concentration of the group compound in the conductive auxiliary liquid is preferably 0.5 to 50% by mass, and within that range, 2% by mass or more is more preferable, 5% by mass or more is more preferable, and 30% by mass or less. Is more preferable, and 20% by mass or less is more preferable. That is, when the concentration of the aromatic compound having at least one hydroxyl group is lower than the above, the ESR of the electrolytic capacitor may not be lowered and the heat resistance may be deteriorated, and at least one hydroxyl group may be present. If the concentration of the aromatic compound is higher than the above, precipitation of the aromatic compound is likely to occur and handling becomes difficult, and ESR of the electrolytic capacitor may be deteriorated.
- the conductive auxiliary liquid contains at least one binder selected from the group consisting of an epoxy compound or a hydrolyzate thereof, a silane compound or a hydrolyzate thereof and a polyalcohol, the resistance of the electrolytic capacitor is increased. This is preferable because the effect of improving the voltage is increased.
- the concentration of the binder in the conductive auxiliary liquid is preferably 0.05 to 20% by mass, and more preferably 0.5 to 5% by mass.
- Examples of the epoxy compound or its hydrolyzate as the binder include polyethylene glycol diglycidyl ether, diethylene glycol glycidyl, glycidyl methacrylate, epoxy propanol (that is, glycidol), methyl glycidyl ether, ethyl glycidyl ether, propyl glycidyl.
- butyl glycidyl ether epoxy butane (or glycidyl methane), epoxy pentane (or glycidyl ethane), epoxy hexane (or glycidyl propane), epoxy heptane (or glycidyl butane) ⁇ , epoxy octane ( ⁇ ⁇ ⁇ ⁇ or glycidyl pentane) , Epoxycyclohexene, ethylene glycol diglycidyl ether, propylene glycol jig Examples include glycidyl ether, butylene glycol diglycidyl ether, pentylene glycol diglycidyl ether, hexylene glycol diglycidyl ether, and glycerol diglycidyl ether.
- Examples of the silane compound or a hydrolyzate thereof include 3-glycidoxy Propyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, vinyltrimethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-acryloxypropyltrimethoxysilane, Examples include 3-mercaptopropylmethyldimethoxysilane, 3-isocyanatopropyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, and silica sol.
- the alcohol for example, polyethylene glycol, polypropylene glycol, and polybutylene glycol.
- the conductive auxiliary liquid contains hydroxybenzene carboxylic acid alkyl ester having 1 to 4 carbon atoms in the alkyl group, such as methyl hydroxybenzene carboxylate, ethyl hydroxybenzene carboxylate, propyl hydroxybenzenecarboxylate, and butyl hydroxybenzenecarboxylate. It is preferable to contain Nd because it improves the initial characteristics of the electrolytic capacitor, such as improving the heat resistance of the electrolytic capacitor and lowering the ESR.
- the concentration of the hydroxybenzenecarboxylic acid alkyl ester in the conductive auxiliary liquid is preferably 0.05 to 10% by mass, more preferably 0.2 to 5% by mass.
- the conductive auxiliary liquid includes acrylic acid, methacrylic acid, ethyl acrylate, propyl acrylate, butyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, ethyl methacrylate, propyl methacrylate, It is preferable to contain unsaturated carboxylic acid or its ester such as butyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, glycidyl methacrylate, etc., because the heat resistance of the electrolytic capacitor is improved.
- the concentration of the unsaturated carboxylic acid or ester thereof in the conductive auxiliary liquid is preferably 0.05 to 10% by mass, more preferably 0.2 to 5% by mass.
- thiophene or a derivative thereof, pyrrole or a derivative thereof, aniline or a derivative thereof, or the like is used as a monomer for synthesizing the conductive polymer, and thiophene or a derivative thereof is particularly preferable.
- Examples of the thiophene derivative in the thiophene or a derivative thereof include 3,4-ethylenedioxythiophene, 3-alkylthiophene, 3-alkoxythiophene, 3-alkyl-4-alkoxythiophene, 3,4-alkylthiophene, 3 , 4-alkoxythiophene, and alkylated ethylenedioxythiophene obtained by modifying the above 3,4-ethylenedioxythiophene with an alkyl group, and the alkyl group or alkoxy group preferably has 1 to 16 carbon atoms, 1 to 4 is particularly preferable.
- the alkylated ethylenedioxythiophene obtained by modifying the 3,4-ethylenedioxythiophene with an alkyl group will be described in detail.
- the 3,4-ethylenedioxythiophene and the alkylated 3,4-ethylenedioxythiophene are: It corresponds to the compound represented by the general formula (1).
- R is hydrogen or an alkyl group
- R in the general formula (1) is hydrogen
- 3,4-ethylenedioxythiophene which is represented by the IUPAC name, “2,3-dihydro-thieno [3,4-b ], [1,4] dioxin (2,3-Dihydro-thieno [3,4-b] [1,4] dioxine) ”, but this compound has a generic name rather than the IUPAC name. Since it is often indicated by “3,4-ethylenedioxythiophene”, in this document, “2,3-dihydro-thieno [3,4-b] [1,4] dioxin” is referred to as “3,4”. -Ethylenedioxythiophene ".
- R in the general formula (1) is an alkyl group
- the alkyl group is preferably one having 1 to 4 carbon atoms, that is, a methyl group, an ethyl group, a propyl group, or a butyl group.
- a compound in which R in the general formula (1) is a methyl group is represented by the name IUPAC “2-methyl-2,3-dihydro-thieno [3,4-b] [1,4 Dioxin (2-Methyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxine) ”, which will be simplified and represented as“ methylated ethylenedioxythiophene ”hereinafter. To do.
- a compound in which R in the general formula (1) is an ethyl group is represented by IUPAC name, “2-ethyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin (2-Ethyl). -2,3-dihydro-thieno [3,4-b] [1,4] dioxine) ”, this will be simplified and represented as“ ethylated ethylenedioxythiophene ”.
- a compound in which R in the general formula (1) is a propyl group is represented by the name IUPAC, “2-propyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin (2-Propyl).
- R in the general formula (1) is a butyl group
- R in the general formula (1) is a butyl group
- IUPAC name “2-butyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin
- 2,Butyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxine) which will be simplified and represented as“ butylated ethylenedioxythiophene ”.
- alkylated ethylenedioxythiophene 2-alkyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin
- alkylated ethylenedioxythiophene methylated ethylenedioxythiophene, ethylated ethylenedioxythiophene, propylated ethylenedioxythiophene, and butylated ethylenedioxythiophene are preferred.
- alkylated ethylenedioxythiophenes can be used alone or in combination of two or more. Further, these alkylated ethylenedioxythiophenes and 3,4-ethylenedioxythiophenes can be used in combination. And these synthetic methods such as methylated ethylenedioxythiophene, ethylated ethylenedioxythiophene, propylated ethylenedioxythiophene, butylated ethylenedioxythiophene are disclosed in International Publication No. 2011/2011 related to the applicant's application. No. 068026, International Publication No. 2011/074380, and the like.
- the conductive polymer in the electrolytic capacitor of the present invention either a conductive polymer dispersion or a conductive polymer obtained by polymerizing a monomer by so-called “in situ polymerization” can be used. it can.
- various dopants may be used as the dopant used in the synthesis of the conductive polymer, particularly polystyrene sulfonic acid, sulfonated polyester, phenol sulfonic acid novolak resin, etc.
- Molecular sulfonic acid-based polymer anions are preferred.
- the polystyrene sulfonic acid preferably has a weight average molecular weight of 10,000 to 1,000,000.
- the weight average molecular weight of the polystyrene sulfonic acid when the weight average molecular weight of the polystyrene sulfonic acid is smaller than 10,000, the conductivity of the obtained conductive polymer may be lowered. Moreover, when the weight average molecular weight of the said polystyrene sulfonic acid is larger than 1,000,000, there exists a possibility that the viscosity of the dispersion liquid of a conductive polymer may become high and it may become difficult to use in preparation of an electrolytic capacitor.
- the polystyrene sulfonic acid has a weight average molecular weight within the above range, preferably 20,000 or more, more preferably 40,000 or more, and preferably 800,000 or less. More preferable is 1,000 or less.
- the sulfonated polyester is a polycondensation product of dicarboxybenzenesulfonic acid diester such as sulfoisophthalic acid ester or sulfoterephthalic acid ester and alkylene glycol in the presence of a catalyst such as antimony oxide or zinc oxide.
- the modified polyester preferably has a weight average molecular weight of 5,000 to 300,000.
- the weight average molecular weight of the sulfonated polyester when the weight average molecular weight of the sulfonated polyester is smaller than 5,000, the conductivity of the obtained conductive polymer may be lowered. Further, when the weight average molecular weight of the sulfonated polyester is larger than 300,000, the viscosity of the dispersion liquid of the conductive polymer is increased, which may make it difficult to use in the production of the electrolytic capacitor.
- the sulfonated polyester preferably has a weight average molecular weight within the above range of 10,000 or more, more preferably 20,000 or more, and preferably 100,000 or less. More preferable is 1,000 or less.
- phenolsulfonic acid novolak resin for example, the following general formula (2) (Wherein R 1 is hydrogen or a methyl group)
- R 1 is hydrogen or a methyl group
- the phenolsulfonic acid novolak resin having a weight average molecular weight of 5,000 to 500,000 is preferable.
- the weight average molecular weight of the phenolsulfonic acid novolak resin when the weight average molecular weight of the phenolsulfonic acid novolak resin is less than 5,000, the conductivity of the obtained conductive polymer may be lowered. Moreover, when the weight average molecular weight of the said phenolsulfonic acid novolak resin is larger than 500,000, there exists a possibility that the viscosity of the dispersion liquid of a conductive polymer may become high, and it may become difficult to use in preparation of an electrolytic capacitor.
- the phenol sulfonic acid novolak resin preferably has a weight average molecular weight within the above range of 10,000 or more, more preferably 400,000 or less, and more preferably 80,000 or less. preferable.
- Polymer anions such as polystyrene sulfonic acid, sulfonated polyester, and phenol sulfonic acid novolak resin can be used alone or in combination of two or more.
- a copolymer of the styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of a methacrylic acid ester, an acrylic acid ester, an unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof (hereinafter, A conductive polymer obtained by oxidative polymerization of thiophene or a derivative thereof using a styrene sulfonic acid and a non-sulfonic acid monomer as a dopant) is highly conductive, Moreover, since it has excellent heat resistance, it is suitable for manufacturing an electrolytic capacitor having low ESR, high reliability under high temperature conditions, and low leakage current.
- a copolymer of the styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of a methacrylic acid ester, an acrylic acid ester, an unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof is synthesized.
- a monomer to be copolymerized with styrene sulfonic acid at least one selected from the group consisting of methacrylic acid ester, acrylic acid ester and unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof is used.
- Esters include, for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hexyl methacrylate, stearyl methacrylate, cyclohexyl methacrylate, diphenylbutyl methacrylate, methacrylate.
- hydroxyalkyl methacrylate such as hydroxybutyl, hydroxyhexyl methacrylate, hydroxystearyl methacrylate, hydroxypolyoxyethylene methacrylate, methoxyhydroxypropyl methacrylate, ethoxyhydroxypropyl methacrylate, dihydroxypropyl methacrylate, dihydroxybutyl methacrylate, etc.
- those having a glycidyl group such as glycidyl methacrylate and methyl glycidyl methacrylate have a structure containing a hydroxyl group by ring opening of the glycidyl group.
- alkyl it is preferable from the viewpoint of characteristics as a dopant when copolymerized with styrenesulfonic acid.
- acrylate ester examples include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, stearyl acrylate, cyclohexyl acrylate, diphenylbutyl acrylate, dimethylaminoethyl acrylate, Acrylic acid such as diethylaminoethyl acrylate, sodium sulfohexyl acrylate, glycidyl acrylate, methyl glycidyl acrylate, hydroxyalkyl acrylate, ie hydroxymethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate Hydroxyalkyl and the like can be used, but hydroxymethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, The number of carbon atoms in the alkyl group, such as Le acid hydroxybutyl acrylate,
- those having a glycidyl group such as glycidyl acrylate and methyl glycidyl acrylate have a structure containing a hydroxyl group by ring opening of the glycidyl group.
- alkyl it is preferable from the viewpoint of characteristics as a dopant when copolymerized with styrenesulfonic acid.
- Examples of the unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof include, for example, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyldimethylmethoxysilane, 3- Methacryloxypropyldimethylethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-acryloxymethyldimethoxysilane, 3-acryloxymethyldiethoxysilane, 3-acryloxytriethoxysilane, p-styryltrimethoxysilane, p-styryltriethoxysilane, p-styrylmethyldimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxy Silane, can be used an unsaturated hydrocarbon containing alkoxysilane compound
- the unsaturated hydrocarbon-containing alkoxysilane compound is the above-mentioned 3-methacryloxypropyltrimethoxysilane
- the hydrolyzate of the unsaturated hydrocarbon-containing alkoxysilane compound is converted into a hydroxyl group by hydrolysis of the methoxy group.
- the resulting structure is 3-methacryloxytrihydroxysilane, or silanes are condensed to form an oligomer, and a compound having a structure in which a methoxy group not used in the reaction is converted into a hydroxyl group is obtained.
- Examples of the unsaturated hydrocarbon-containing alkoxysilane compound include 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, p-styryltrimethoxysilane, vinyltrimethoxysilane, and the like. It is preferable from the standpoint of properties as a dopant when copolymerized.
- Styrene in a copolymer of this styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of methacrylic acid esters, acrylic acid esters and unsaturated hydrocarbon-containing alkoxysilane compounds or hydrolysates thereof As a ratio of sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of methacrylic acid ester, acrylic acid ester and unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof, It is preferably 1: 0.01 to 0.1: 1.
- the molecular weight is preferably about 5,000 to 500,000 in terms of weight average molecular weight from the viewpoint of water solubility and characteristics as a dopant, and more preferably about 40,000 to 200,000 in terms of weight average molecular weight.
- a copolymer of this styrene sulfonic acid and a non-sulfonic acid monomer can also be used in combination with a high molecular sulfonic acid such as polystyrene sulfonic acid, sulfonated polyester, phenol sulfonic acid novolak resin, or the like.
- a high molecular sulfonic acid such as polystyrene sulfonic acid, sulfonated polyester, phenol sulfonic acid novolak resin, or the like.
- a copolymer of at least one non-sulfonic acid monomer selected from the group consisting of a compound or a hydrolyzate thereof) and the like are all for water or a mixture of water and a water-miscible solvent. Therefore, oxidative polymerization is It is carried out in an aqueous solution.
- water-miscible solvent constituting the aqueous liquid examples include methanol, ethanol, propanol, acetone, acetonitrile, and the like.
- the mixing ratio of these water-miscible solvents with water is 50 in the entire aqueous liquid. The mass% or less is preferable.
- oxidative polymerization for synthesizing the conductive polymer, either chemical oxidative polymerization or electrolytic oxidative polymerization can be employed.
- persulfate is used as an oxidizing agent in performing chemical oxidative polymerization.
- the persulfate include ammonium persulfate, sodium persulfate, potassium persulfate, calcium persulfate, and barium persulfate. Is used.
- the conditions during the polymerization are not particularly limited, but the temperature during chemical oxidative polymerization is preferably 5 ° C. to 95 ° C., more preferably 10 ° C. to 30 ° C., and polymerization
- the time is preferably 1 hour to 72 hours, more preferably 8 hours to 24 hours.
- Electrolytic oxidation polymerization is be carried out even at a constant voltage at a constant current, for example, when performing electrolytic oxidation polymerization at a constant current, preferably 0.05mA / cm 2 ⁇ 10mA / cm 2 as the current value, 0.2 mA / cm 2 to 4 mA / cm 2 is more preferable.
- the voltage is preferably 0.5 V to 10 V, more preferably 1.5 V to 5 V.
- the temperature during the electrolytic oxidation polymerization is preferably 5 ° C to 95 ° C, particularly preferably 10 ° C to 30 ° C.
- the polymerization time is preferably 1 hour to 72 hours, more preferably 8 hours to 24 hours.
- ferrous sulfate or ferric sulfate may be added as a catalyst.
- the conductive polymer obtained as described above is obtained immediately after polymerization in a state of being dispersed in water or an aqueous liquid, and includes persulfate as an oxidizing agent, iron sulfate used as a catalyst, and decomposition products thereof. Contains. Therefore, it is preferable to remove the metal component with a cation exchange resin after the impurities are dispersed by applying a dispersion of the conductive polymer containing the impurities to a dispersing machine such as an ultrasonic homogenizer, a high-pressure homogenizer, or a planetary ball mill.
- a dispersing machine such as an ultrasonic homogenizer, a high-pressure homogenizer, or a planetary ball mill.
- the particle size of the conductive polymer measured by the dynamic light scattering method at this time is preferably 100 ⁇ m or less, more preferably 10 ⁇ m or less, 0.01 ⁇ m or more, and more preferably 0.1 ⁇ m or more.
- the ethanol precipitation method, ultrafiltration method, anion exchange resin, etc. are used to remove the oxidant and the catalyst generated by decomposition of the catalyst and, as will be described later, a conductivity improver and a binder are added as necessary. May be.
- the conductive polymer dispersion obtained as described above may contain a conductivity improver as described above.
- a conductivity improver is contained in the conductive polymer dispersion, the conductivity of the conductive polymer film obtained by drying the conductive polymer dispersion is improved.
- ESR of an electrolytic capacitor using the conductive polymer as an electrolyte can be lowered.
- conductivity improvers examples include high boiling points such as dimethyl sulfoxide, ⁇ -butyrolactone, sulfolane, N-methylpyrrolidone, dimethyl sulfone, ethylene glycol, diethylene glycol, and polyethylene glycol (for example, high boiling point of 150 ° C. or higher).
- Organic solvents and saccharides such as erythritol, glucose, mannose, and pullulan, and dimethyl sulfoxide and butanediol are particularly preferable.
- the addition amount of such a conductivity improver is 5 to 3,000% on a mass basis with respect to the conductive polymer in the dispersion (that is, the conductivity improver with respect to 100 parts by mass of the conductive polymer). Is preferably 5 to 3,000 parts by mass), particularly preferably 20 to 700%.
- the addition amount of the conductivity improver is less than the above, the effect of improving the conductivity is not sufficiently exhibited, and when the addition amount of the conductivity improver is more than the above, it takes time to dry the dispersion. Moreover, there is a possibility of causing a decrease in conductivity.
- the content of the conductive polymer in the dispersion affects the workability when the capacitor element is immersed in the conductive polymer dispersion and taken out, it is usually about 0.5 to 15% by mass. Is preferred. In other words, if the content of the conductive polymer is less than the above, it may take time to dry, and if the content of the conductive polymer is more than the above, the viscosity of the dispersion is high. Thus, workability in manufacturing the electrolytic capacitor may be reduced.
- the conductive polymer obtained by drying the conductive polymer dispersion thus obtained has high conductivity and excellent heat resistance based on the properties of the polymer anion used as a dopant in the synthesis. Therefore, when it is used as an electrolyte, it becomes a factor for obtaining an electrolytic capacitor with low ESR and high reliability when used under high temperature conditions.
- the capacitor element is immersed in the conductive polymer dispersion, taken out (pulled up), and dried.
- the obtained conductive polymer will be used as an electrolyte.
- This conductive polymer is provided on the dielectric layer made of the oxide film of the valve metal on the surface of the valve metal that becomes the anode in the capacitor element.
- the conductive polymer may be attached to other parts of the capacitor element. Further, instead of immersing the capacitor element in the conductive polymer dispersion as described above, the conductive polymer dispersion may be sprayed or applied to the capacitor element.
- a binder for example, polyvinyl alcohol, polyurethane, polyester, acrylic resin, polyamide, polyimide, epoxy resin, polyacrylonitrile resin, polymethacrylonitrile resin, polystyrene resin, novolac resin, sulfonated polyallyl, sulfonated polyvinyl, Examples include sulfonated polystyrene and silane coupling agents, and polyester, polyurethane, acrylic resin, sulfonated polyallyl, sulfonated polyvinyl, sulfonated polystyrene and the like are preferable, and in particular, sulfonated polyallyl, sulfonated polyvinyl, and sulfonated polystyrene. If a sulfone group
- the surface of a valve metal foil such as an aluminum foil is etched and then subjected to chemical conversion to form an oxide film of the valve metal.
- a lead terminal is attached to the anode formed with the dielectric layer made of, and a lead terminal is attached to the cathode made of a valve metal foil such as an aluminum foil, and the anode with the lead terminal and the cathode are wound through a separator.
- the capacitor element thus prepared is immersed in a dispersion of a conductive polymer, taken out, dried, and after repeating these operations to form a conductive polymer layer, the capacitor element is impregnated with a conductive auxiliary liquid. After that, the wound electrolytic capacitor can be manufactured by packaging with an exterior material.
- the conductive auxiliary liquid is impregnated, for example, by immersing the capacitor element in the conductive auxiliary liquid. Is taken out from the conductive auxiliary liquid, the impregnated conductive auxiliary liquid is mainly held in the separator or the conductive polymer.
- the separator is composed of a porous body, and the conductive polymer is microscopically porous, so that the conductive auxiliary liquid penetrates into these holes and is held in that state. Will be.
- a non-wound electrolytic capacitor such as a tantalum electrolytic capacitor, a niobium electrolytic capacitor, or a laminated aluminum electrolytic capacitor
- a valve metal such as tantalum, niobium, or aluminum serving as an anode.
- Capacitor elements having a porous body and a dielectric layer made of an oxide film of the valve metal are immersed in a conductive polymer dispersion, taken out, dried, and then immersed in this dispersion and dried.
- the capacitor element After forming a conductive polymer layer by repeating the process, the capacitor element is impregnated with a conductive auxiliary liquid, and then a carbon paste and a silver paste are applied, dried, and then packaged to provide tantalum electrolysis. Capacitors, niobium electrolytic capacitors, multilayer aluminum electrolytic capacitors, and the like can be manufactured. Further, instead of immersing the capacitor element in the conductive polymer dispersion as described above, the conductive polymer dispersion may be sprayed or applied to the capacitor element.
- an organic sulfonic acid such as aromatic sulfonic acid is used as a dopant, and the capacitor element described above is added to a liquid containing a monomer and an oxidizing agent.
- a conductive polymer was synthesized on the capacitor element by so-called "in situ polymerization”
- an electrolytic capacitor can be manufactured by immersing them all in a conductive auxiliary liquid, impregnating the capacitor element with the conductive auxiliary liquid, and applying a predetermined exterior to the capacitor element.
- the liquid containing the monomer and the oxidant may be sprayed or applied to the capacitor element.
- the conductive polymer is provided on the capacitor element using the conductive polymer dispersion liquid as described above, the impregnation of the conductive auxiliary liquid is performed by immersing the capacitor element in the conductive auxiliary liquid as illustrated. Instead of this, the conductive auxiliary liquid may be sprayed or applied to the capacitor element.
- the capacitor element when the conductive polymer is provided on the capacitor element using the dispersion liquid of the conductive polymer, as a pretreatment, the capacitor element includes a cyclic organic compound having at least one hydroxyl group and 150.
- Treatment with a solution obtained by dissolving a high boiling point solvent at a temperature of °C or higher in an organic solvent (hereinafter, this solution may be referred to as “pretreatment solution”) is also included in the scope of the present invention.
- the cyclic organic compound having at least one hydroxyl group used in preparing the solution for use the same aromatic compounds as used in preparing the conductive auxiliary liquid can be used.
- the high boiling point solvent used in the preparation of the pretreatment solution can be the same as the high boiling point organic solvent used in the preparation of the conductive auxiliary liquid.
- the coexistence of a high boiling point solvent having a boiling point of 150 ° C. or more and a cyclic organic compound having at least one hydroxyl group reduces the ESR of the obtained electrolytic capacitor and increases the capacitance. This is to make it happen.
- the compatibility between the cyclic organic compound having at least one hydroxyl group and the conductive polymer is poor, and the characteristics of the electrolytic capacitor cannot be sufficiently improved by the cyclic organic compound having at least one hydroxyl group.
- the compatibility between the cyclic organic compound having at least one hydroxyl group and the conductive polymer is improved, so that at least one hydroxyl group is present. It is considered that the improvement of the characteristics of the electrolytic capacitor is achieved by the cyclic organic compound.
- organic solvent used for preparing the above pretreatment solution for example, lower alcohols such as methanol, ethanol, propanol and butanol, and low-boiling organic solvents such as acetonitrile, acetone, tetrahydrofuran and ethyl acetate are used.
- the low boiling point means that the boiling point is lower than the boiling point of a high boiling point solvent having a temperature of 150 ° C. or higher, and the drying in the pretreatment step is performed mainly for the purpose of removing the organic solvent as the solvent. Usually, it is performed at a temperature higher than the boiling point of the organic solvent.
- the high-boiling solvent having a boiling point of 150 ° C. or higher in the pretreatment solution is almost removed by azeotropy with the organic solvent at the time of drying, but a part of them has at least one hydroxyl group. It remains in a state of being adsorbed to the cyclic organic compound, and as described above, the remaining part improves the compatibility between the cyclic organic compound having at least one hydroxyl group and the conductive polymer. It is thought that it contributes to the characteristic improvement by the cyclic organic compound which has at least one.
- the boiling point is set to 150 ° C. or higher in order to prevent adverse effects on the heat resistance of the electrolytic capacitor even if it remains in the electrolytic capacitor. This is based on the fact that a storage test at 150 ° C. is adopted as one of the tests in the evaluation.
- the concentration of the cyclic organic compound having at least one hydroxyl group is preferably 0.1 to 50% by mass, more preferably 1% by mass or more within the range, and 10% by mass or less. More preferably, the concentration of the high-boiling solvent having a boiling point of 150 ° C. or higher is preferably 0.05 to 10% by mass, more preferably 0.2% by mass or more within that range, and more preferably 5% by mass or less. preferable.
- a lower alcohol such as methanol or ethanol
- the organic solvent in order to increase the solubility of the cyclic organic compound having at least one hydroxyl group, for example, methylamine, dimethyl Lower amine compounds such as amine, trimethylamine, ethylamine, diethylamine, triethylamine, and ethylenediamine, and basic substances such as ammonia, imidazole, methylimidazole, methylethylimidazole, and methylbutylimidazole may be added.
- the voltage resistance of the electrolytic capacitor can be improved by adding 3-glycidoxypropyltrimethoxysilane, polyethylene glycol diglycidyl ether, diethylene glycol glycidyl, glycidyl methacrylate, etc. to the pretreatment solution. Therefore, it is preferable.
- the withstand voltage improver composed of 3-glycidoxypropyltrimethoxysilane or the like as described above is added to the solution containing a cyclic organic compound having at least one hydroxyl group.
- the cyclic organic compound having at least one hydroxyl group Is preferably 0.1 to 1000% by mass (that is, 0.1 to 1000 parts by mass of a withstand voltage improver with respect to 100 parts by mass of the cyclic organic compound having at least one hydroxyl group), and within the above range, 10 mass% or more is more preferable, and 300 mass% or less is more preferable.
- the pretreatment with the pretreatment solution is performed by immersing the capacitor element in the pretreatment solution, taking it out and drying it, or by spraying or applying the pretreatment solution to the capacitor element and then drying it. Done.
- the capacitor element has a boiling point after the process of providing the conductive polymer to the capacitor element using the conductive polymer dispersion and before impregnating the conductive auxiliary liquid.
- Treatment with a solution containing a high-boiling organic solvent having a boiling point of 150 ° C. or higher or a high-boiling organic solvent having a boiling point of 150 ° C. or higher at 20% by mass or more and less than 100% by mass is also included in the scope of the present invention.
- ethylene glycol (boiling point: 198 ° C.), dimethyl sulfoxide (boiling point: 189 ° C.), ⁇ -butyrolactone (boiling point: 203 ° C.), sulfolane (boiling point: 285 ° C.).
- N-methylpyrrolidone (boiling point: 202 ° C.), dimethylsulfolane (boiling point: 233 ° C.), butanediol (boiling point: 230 ° C.), diethylene glycol ( Point: 244 ° C.), glycerol (glycerin) (boiling point: 290 ° C.), triethylene glycol (boiling point: 288 ° C.) and the like. In the present invention, those having a boiling point of 180 ° C. to 210 ° C.
- ethylene glycol (boiling point: 198 ° C.), dimethyl sulfoxide (boiling point: 189 ° C.), and ⁇ -gyrolactone (boiling point: 203 ° C.) are particularly preferred.
- the solvent used in preparing the solution containing the high boiling point organic solvent having a boiling point of 150 ° C. or higher at 20% by mass or more and less than 100% by mass is not particularly limited, but for example, ethanol, methanol, propanol
- a lower alcohol having 1 to 4 carbon atoms such as butanol, water, acetonitrile, acetone, tetrohydrofuran, ethyl acetate and the like can be used, and methanol, ethanol, propanol, butanol, water and the like are particularly preferable.
- the content of the high boiling organic solvent having a boiling point of 150 ° C. or higher is set to 20% by mass or more when the concentration of the high boiling organic solvent is lower than 20% by mass. This is because it is not possible to sufficiently improve the capacitor characteristics such as lowering the ESR in spite of the use.
- a solution containing a high boiling point organic solvent having a boiling point of 150 ° C. or higher or a high boiling point organic solvent having a boiling point of 150 ° C. or higher in an amount of 20% by mass to less than 100% by mass for example, p-hydroxybenzenecarboxylic acid Butyl, p-nitrophenol, methyl p-hydroxybenzenecarboxylate, ethyl p-hydroxybenzenecarboxylate, propyl p-hydroxybenzenecarboxylate, p-hydroxybenzenecarboxylic acid, o-hydroxybenzenecarboxylic acid, o-hydroxybenzenecarboxylic acid It is preferable to add an additive such as butyl acid, butyl m-hydroxybenzenecarboxylate, o-nitrophenol, m-nitrophenol, benzenedicarboxylic acid, dinitrophenol because the capacitor characteristics can be further improved.
- butyl p-hydroxybenzenecarboxylate, p-nitrophenol, and p-hydroxybenzenecarboxylic acid are particularly preferable because they significantly reduce capacitor characteristics, particularly ESR, and remarkably improve charge / discharge characteristics.
- These additives are preferably added at a concentration of 0.5% by mass or more in a high-boiling organic solvent having a boiling point of 150 ° C. or higher or a solution containing the high-boiling organic solvent in a specific ratio. It is more preferable to add at the above concentration, but if the amount added is too large, ESR may increase, so it is preferable to add at a concentration of 20% by mass or less, and to be added at a concentration of 10% by mass or less. More preferably.
- benzene-based additives have functional groups such as hydroxyl group, nitro group, carboxyl group, and carboxyester group.
- functional groups such as hydroxyl group, nitro group, carboxyl group, and carboxyester group.
- alkoxysilane compounds such as 3-glycidoxypropyltrimethoxysilane, acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane, vinylsilane, tetramethoxysilane, tetraethoxysilane, methyl Trimethoxysilane, butyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-phenylaminopropyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, etc.
- glycidyl Add compounds such as ethylene glycol diglycidyl, polyethylene glycol diglycidyl, glycidyl methacrylate, glycidic acid, glycidic acid ester, pentaerythritol glycidyl ether, etc. It may be.
- an epoxy resin or a polyhydric alcohol such as polyethylene glycol 400, polyethylene glycol 600, polyethylene glycol 1500, diglycerol, polyglycerol, or the like may be added.
- the capacitor characteristics in particular, the capacitance can be increased, the breakdown voltage can be increased, and the withstand voltage characteristics can be improved.
- an epoxy resin or a polyhydric alcohol having a very high boiling point such as those exemplified above is added to a high-boiling organic solvent having a boiling point of 150 ° C. or higher.
- These additives are preferably added in an amount of 0.1% by mass or more in a high-boiling organic solvent having a boiling point of 150 ° C.
- these additives are preferably used in combination of two or more of different series such as an alkoxysilane compound and a glycidyl compound because the characteristics can be further improved.
- a solution containing the high boiling point organic solvent having a boiling point of 150 ° C. or higher or the high boiling point organic solvent having a boiling point of 150 ° C. or higher in an amount of 20% by mass or more and less than 100% by mass (hereinafter, this solution may be referred to as an “intermediate treatment solution”).
- the capacitor element is processed by immersing the capacitor element provided with a conductive polymer in the intermediate treatment solution, taking it out, drying it, or spraying or applying the intermediate treatment solution to the capacitor element. Or after drying.
- Examples 1 to 24 and Comparative Examples 1 to 12 to be compared with them will be described. Prior to these Examples and Comparative Examples, preparation examples of conductive auxiliary liquids used in these Examples are described. Preparation examples 1 to 10 and preparation examples of electrolytic solutions used in comparative examples are shown in preparation examples 11 to 13, and preparation examples of conductive polymer dispersions used in examples and the like are prepared in preparation examples (I) to (III ).
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 16 ⁇ S / cm.
- the above-mentioned ⁇ -butyrolactone corresponds to a high-boiling organic solvent having a boiling point of 203 ° C. and a boiling point of 150 ° C. or more
- hydroxybenzenecarboxylic acid and nitrophenol correspond to aromatic compounds having at least one hydroxyl group.
- the concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 9.9%, and the ratio of hydroxybenzenecarboxylic acid to nitrophenol is 10: 1 by mass.
- 3-glycidoxypropyltrimethoxysilane corresponds to the binder, and the concentration of 3-glycidoxypropyltrimethoxysilane in the conductive auxiliary liquid is about 0.18%.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 16 ⁇ S / cm.
- the above-mentioned ⁇ -butyrolactone corresponds to a high-boiling organic solvent having a boiling point of 203 ° C. and a boiling point of 150 ° C. or more
- hydroxybenzenecarboxylic acid and nitrophenol correspond to aromatic compounds having at least one hydroxyl group.
- the concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 10.6%, and the ratio of hydroxybenzenecarboxylic acid to nitrophenol is 5: 1 by mass.
- 3-glycidoxypropyltrimethoxysilane corresponds to the binder, and the concentration of 3-glycidoxypropyltrimethoxysilane in the conductive auxiliary liquid is about 0.9%.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. using a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 8 ⁇ S / cm.
- the ethylene glycol has a boiling point of 198 ° C. and corresponds to a high-boiling organic solvent having a boiling point of 150 ° C. or higher, and hydroxybenzenecarboxylic acid and nitrophenol correspond to aromatic compounds having at least one hydroxyl group.
- the concentration of the aromatic compound having at least one group in the conductive auxiliary liquid is about 10.6%, and the ratio of hydroxybenzenecarboxylic acid to nitrophenol is 5: 1 by mass.
- 3-glycidoxypropyltrimethoxysilane corresponds to the binder, and the concentration of 3-glycidoxypropyltrimethoxysilane in the conductive auxiliary liquid is about 0.9%.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured under the condition of 25 ° C. using a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 12 ⁇ S / cm.
- the sulfolane has a boiling point of 285 ° C. and corresponds to a high boiling point organic solvent having a boiling point of 150 ° C. or more, and hydroxybenzenecarboxylic acid and nitrophenol correspond to an aromatic compound having at least one hydroxyl group.
- the concentration of the aromatic compound having at least one in the conductive auxiliary liquid is about 10.6%, and the ratio of hydroxybenzenecarboxylic acid to nitrophenol is 5: 1 by mass ratio.
- 3-glycidoxypropyltrimethoxysilane corresponds to the binder, and the concentration of 3-glycidoxypropyltrimethoxysilane in the conductive auxiliary liquid is about 0.9%.
- Preparation Example 5 A conductive auxiliary liquid was prepared in the same manner as in Preparation Example 1 except that the amount of hydroxybenzenecarboxylic acid added was changed from 50 g to 75 g.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 20 ⁇ S / cm.
- ⁇ -butyrolactone is used as the high-boiling organic solvent having a boiling point of 150 ° C. or higher, and hydroxybenzenecarboxylic acid and nitrophenol are used as aromatic compounds having at least one hydroxyl group.
- concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid used is about 13.8%, and the ratio of hydroxybenzenecarboxylic acid to nitrophenol is 15 by mass. : 1.
- the concentration of 3-glycidoxypropyltrimethoxysilane as a binder in the conductive auxiliary liquid is about 0.17%.
- Preparation Example 6 A conductive auxiliary liquid was prepared in the same manner as in Preparation Example 1, except that the amount of hydroxybenzenecarboxylic acid added was changed from 50 g to 30 g.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured under the condition of 25 ° C. with a conductivity meter (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 14 ⁇ S / cm.
- ⁇ -butyrolactone is used as the high boiling point organic solvent having a boiling point of 150 ° C. or higher, and hydroxybenzene carboxylic acid and nitrophenol are used as aromatic compounds having at least one hydroxyl group.
- concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 5.7%, and the ratio of hydroxybenzenecarboxylic acid to nitrophenol is 6 by mass. : 1.
- the concentration of 3-glycidoxypropyltrimethoxysilane as a binder in the conductive auxiliary liquid is about 0.19%.
- Preparation Example 7 Further, except that 5 g of polyethylene glycol 400 was added, the same operation as in Preparation Example 1 was performed to prepare a conductive auxiliary liquid.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 16 ⁇ S / cm.
- the polyethylene glycol 400 corresponds to a conductivity improver, and also in Preparation Example 7, ⁇ -butyrolactone is used as a high boiling point organic solvent having a boiling point of 150 ° C. or higher, and an aromatic having at least one hydroxyl group.
- Hydroxybenzene carboxylic acid and nitrophenol are used as the system compound, and the concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 9.8%.
- the ratio of acid to nitrophenol is 10: 1 by weight.
- the concentration of 3-glycidoxypropyltrimethoxysilane as a binder in the conductive auxiliary liquid is about 0.18%, and the concentration of the polyethylene glycol 400 as a conductive improver in the conductive auxiliary liquid is about 0. 89%.
- Preparation Example 8 A conductive auxiliary liquid was prepared in the same manner as in Preparation Example 7 except that 8 g of dimethylamine was added.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured under the condition of 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 530 ⁇ S / cm.
- the dimethylaluminum corresponds to the cation component of the electrolyte, and also in Preparation Example 8, ⁇ -butyrolactone is used as the high-boiling organic solvent having a boiling point of 150 ° C. or higher, and the aromatic system has at least one hydroxyl group.
- ⁇ -butyrolactone is used as the high-boiling organic solvent having a boiling point of 150 ° C. or higher, and the aromatic system has at least one hydroxyl group.
- hydroxybenzene carboxylic acid and nitrophenol are used, and the concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 9.7%.
- the ratio of nitrophenol is 10: 1 by weight.
- the concentration of 3-glycidoxypropyltrimethoxysilane as a binder in the conductive auxiliary liquid is about 0.18%, and the concentration of the polyethylene glycol 400 as a conductive improver in the conductive auxiliary liquid is about 0.
- the concentration of dimethylamine in the conductive auxiliary liquid is about 1.4%.
- Preparation Example 9 Further, except that 5 g of glycerin was added, the same operation as in Preparation Example 1 was performed to prepare a conductive auxiliary liquid.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 16 ⁇ S / cm.
- the glycerin corresponds to a heat resistance improver, and also in Preparation Example 9, ⁇ -butyrolactone is used as a high boiling point organic solvent having a boiling point of 150 ° C. or higher, and an aromatic compound having at least one hydroxyl group Hydroxybenzene carboxylic acid and nitrophenol are used, and the concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 8.8%.
- the ratio with nitrophenol is 10: 1 by mass.
- the concentration of 3-glycidoxypropyltrimethoxysilane as a binder in the conductive auxiliary liquid is about 0.17%, and the concentration of glycerin as a heat resistance improver in the conductive auxiliary liquid is about 0.1. 89%.
- Preparation Example 10 Further, except that 3 g of hydroxyethyl acrylate was added, the same operation as in Preparation Example 1 was performed to prepare a conductive auxiliary liquid.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. using a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 18 ⁇ S / cm.
- the hydroxyethyl acrylate corresponds to a heat resistance improver, and also in Preparation Example 10, ⁇ -butyrolactone is used as a high boiling point organic solvent having a boiling point of 150 ° C. or higher, and an aromatic having at least one hydroxyl group.
- the aromatic compound hydroxybenzene carboxylic acid and nitrophenol are used, and the concentration of the aromatic compound having at least one hydroxyl group in the conductive auxiliary liquid is about 9.8%.
- the ratio of acid to nitrophenol is a mass ratio of 10: 1.
- the concentration of 3-glycidoxypropyltrimethoxysilane as a binder in the conductive auxiliary liquid is 0.18%, and the concentration of hydroxyethyl acrylate in the conductive auxiliary liquid is 0.5%. .
- Preparation Example 11 (for comparative example) An electrolytic solution was prepared by adding 50 g of ammonium adipate to 500 g of ⁇ -butyrolactone placed in a 1 L beaker equipped with a stirrer, and then stirring for 24 hours.
- the electrical conductivity of this electrolytic solution was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd. As a result, the electrical conductivity of this electrolytic solution was 3.0 mS / cm.
- Preparation Example 12 (for comparative example) Further, an electrolytic solution was prepared in the same manner as in Preparation Example 11 except that 5 g of glycerin was added.
- the electrical conductivity of this electrolytic solution was measured with a conductivity measuring device (F-55) manufactured by Horiba, Ltd. at 25 ° C., and the electrical conductivity of this electrolytic solution was 3.3 mS / cm.
- Preparation Example 13 (for comparative example) An electrolytic solution was prepared in the same manner as in Preparation Example 11 except that 5 g of 3-glycidoxypropyltrimethoxysilane was added.
- the electrical conductivity of this electrolytic solution was measured with a conductivity measuring device (F-55) manufactured by Horiba, Ltd. at 25 ° C., and the electrical conductivity of this electrolytic solution was 3.3 mS / cm.
- the treated liquid is passed through a filter having a pore size of 1 ⁇ m, and the passing liquid is treated with an ultrafiltration apparatus (Vivaflow 200 (trade name), molecular weight fraction 50,000, manufactured by Sartorius Co., Ltd.). Ingredients were removed.
- the liquid after this treatment was diluted with water to adjust the concentration to 2%, and then the pH was adjusted to 3 with a 28% aqueous ammonia solution. Then, 4 g of ethylene glycol was added to 40 g of the solution to obtain a conductive polymer dispersion (I).
- conductive polymer dispersion (III) 40 g of the conductive polymer dispersion (I) prepared in Preparation Example (I) of Conductive Polymer Dispersion was placed in a beaker equipped with a stirrer, and 0.2 g of nitrophenol was added while stirring. However, even after stirring for several days, nitrophenol did not dissolve.
- Example 1 After etching the surface of the aluminum foil, a lead terminal is attached to the anode on which a dielectric layer made of an aluminum oxide film is formed by chemical conversion, and a lead terminal is attached to the cathode made of the aluminum foil.
- a capacitor element was manufactured by winding an anode with a terminal and a cathode through a separator. This capacitor element is set so that ESR is 15 m ⁇ or less, capacitance is 50 ⁇ F or more, and breakdown voltage (withstand voltage) is 100 V or more.
- the capacitor element was immersed in the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion, taken out after 5 minutes, and dried at 150 ° C. for 30 minutes. This operation was performed twice to provide a conductive polymer on the dielectric layer of the capacitor element.
- the capacitor element provided with the conductive polymer as described above is immersed in the conductive auxiliary liquid prepared in Preparation Example 1, the capacitor element is impregnated with the conductive auxiliary liquid, and is taken out after 5 minutes.
- a wound aluminum electrolytic capacitor was manufactured by packaging with an exterior material.
- Example 2 Example 2 and Comparative Examples 1 to 3 Example 1 was used except that the conductive auxiliary liquid prepared in Preparation Examples 2 to 10 and the electrolytic solution prepared in Preparation Examples 11 to 13 were separately used in place of the conductive auxiliary liquid prepared in Preparation Example 1.
- a wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1.
- Comparative Example 4 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the conductive auxiliary liquid was not impregnated.
- ESR and capacitance were measured, and leakage current was measured.
- the results are shown in Table 1 together with the type of conductive auxiliary solution or electrolyte used.
- the measuring method of ESR, an electrostatic capacitance, and a leakage current is as follows.
- ESR Using an LCR meter (4284A) manufactured by HEWLETT PACKARD, measurement is performed at 100 kHz under the condition of 25 ° C.
- Capacitance Using an LCR meter (4284A) manufactured by HEWLETT PACKARD, measurement is performed at 120 Hz under the condition of 25 ° C.
- Leak current A voltage of 63 V is applied to the wound aluminum electrolytic capacitor at 25 ° C. for 60 seconds, and then the leakage current is measured with a digital oscilloscope.
- the wound aluminum electrolytic capacitors of Examples 1 to 10 and Comparative Examples 1 to 4 (10 each) after the above characteristic measurement were stored in a dryer at 260 ° C. for 3 minutes and stored.
- the ESR, capacitance and leakage current were measured in the same manner as described above, and the breakdown voltage was measured.
- the results are shown in Table 2.
- the breakdown voltage was measured by using PRK650-2.5 manufactured by Matsusada Precision Co., Ltd., and measuring the voltage at the time of breakdown by increasing the voltage at a rate of 1 V / sec under the condition of 25 ° C.
- the wound aluminum electrolytic capacitors of Examples 1 to 10 (hereinafter, “winding aluminum electrolytic capacitor” may be simply expressed as “capacitor”) have an ESR of 11 0.1 to 13.3 m ⁇ , satisfying a set ESR of 15 m ⁇ or less, a capacitance of 58.2 to 59.2 ⁇ F, satisfying a set capacitance of 50 ⁇ F or more, and Comparative Examples 1 to 3 ESR is lower (smaller) than that of the capacitor and the capacitance and leakage current are comparable to the capacitors of Comparative Examples 1 to 3, and these have low ESR without causing a significant deterioration in characteristics.
- Winding aluminum electrolytic capacitor may be simply expressed as “capacitor”
- ESR ESR of 11 0.1 to 13.3 m ⁇ , satisfying a set ESR of 15 m ⁇ or less, a capacitance of 58.2 to 59.2 ⁇ F, satisfying a set capacitance of 50 ⁇ F or more
- Comparative Examples 1 to 3 ESR is
- the capacitors of Examples 1 to 10 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution is used in combination with the conductive polymer are more effective than the capacitors in Comparative Examples 1 to 3 in which the electrolytic solution is used in combination with the conductive polymer.
- the capacitors of Examples 1 to 10 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution is used in combination with the conductive polymer are more effective than the capacitors in Comparative Examples 1 to 3 in which the electrolytic solution is used in combination with the conductive polymer.
- the capacitors of Examples 1 to 10 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution is used in combination with the conductive polymer are more effective than the capacitors in Comparative Examples 1 to 3 in which the electrolytic solution is used in combination with the conductive polymer.
- the capacitor of Comparative Example 4 that was not impregnated with the conductive auxiliary liquid had higher (large) ESR, lower capacitance, and higher leakage current than the capacitors of Examples 1 to 10.
- the capacitors of Examples 1 to 10 have breakdown voltages of 118 to 119 V, satisfy the set breakdown voltage of 100 V or more, and in addition, the ESR is lower than the capacitors of Comparative Examples 1 to 3, and as shown in Table 3, the capacitors of Examples 1 to 10 are the same as those of Comparative Examples 1 to 3 even after being stored at 150 ° C. for 250 hours. Compared with the capacitors, the ESR was low. In particular, the capacitors of Comparative Examples 1 to 3 using an electrolytic solution had a larger increase in ESR when stored at 150 ° C. for 250 hours than the capacitors of Examples 1 to 10. The heat resistance was bad. That is, the capacitors of Examples 1 to 10 using the conductive auxiliary liquid having low conductivity were superior in heat resistance to the capacitors of Comparative Examples 1 to 3 using the electrolytic solution.
- the capacitors of Examples 1 to 10 were higher and superior to the capacitors of Comparative Examples 1, 2, and 4, and the capacitor of Comparative Example 3 And no degradation in characteristics regarding breakdown voltage was observed.
- Example 11 After etching the surface of the aluminum foil, a lead terminal is attached to the anode on which a dielectric layer made of an aluminum oxide film is formed by chemical conversion, and a lead terminal is attached to the cathode made of the aluminum foil.
- a capacitor element was manufactured by winding an anode with a terminal and a cathode through a separator. This capacitor element is set so that ESR is 15 m ⁇ or less, capacitance is 50 ⁇ F or more, and breakdown voltage (withstand voltage) is 100 V or more.
- the capacitor element was washed by immersing it in a 2% methanol solution of paratoluenesulfonic acid for 10 minutes, then immersed in pure water for 5 minutes, and then dried in a dryer set at 105 ° C. for 30 minutes. did.
- the capacitor element in which the conductive polymer is synthesized by so-called “in-situ polymerization” on the dielectric layer of the aluminum foil (the conductive polymer may adhere to other portions) is prepared as described above. It was immersed in the conductive auxiliary liquid prepared in Example 1, the capacitor element was impregnated with the conductive auxiliary liquid, taken out after 5 minutes, and this was covered with an exterior material to produce a wound aluminum electrolytic capacitor.
- Comparative Example 8 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 11 except that the conductive auxiliary liquid was not impregnated.
- wound aluminum electrolytic capacitors of Examples 11 to 17 and Comparative Examples 5 to 8 manufactured as described above (hereinafter referred to as “winding aluminum electrolytic capacitors” may be simplified and indicated as “capacitors” in some cases. ), ESR, capacitance and leakage current were measured in the same manner as described above. The results are shown in Table 4 in the same manner as in Table 1.
- the capacitors of Examples 11 to 17 had an ESR of 12.1 to 13.4 m ⁇ , satisfied a set ESR of 15 m ⁇ or less, and had a capacitance of 59.0 to 59.2 ⁇ F. Thus, the set capacitance of 50 ⁇ F or more was satisfied, and the ESR was lower than the capacitors of Comparative Examples 5 to 7.
- the capacitors of Examples 11 to 17 and Comparative Examples 5 to 7 the capacitors of Examples 11 to 17 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution is used in combination with the conductive polymer.
- the ESR was lower than that of the capacitors of Comparative Examples 5 to 7 in which was used together with the conductive polymer.
- the capacitor of Comparative Example 8 that was not impregnated with the conductive auxiliary liquid had higher (larger) ESR, lower capacitance, and higher leakage current than the capacitors of Examples 11 to 17.
- the capacitors of Examples 11 to 17 have the breakdown voltage of 108 to 116 V, satisfy the set breakdown voltage of 100 V or more, and in addition, the ESR is lower than the capacitors of Comparative Examples 5 to 7, and as shown in Table 6, the capacitors of Examples 11 to 17 are the same as those of Comparative Examples 5 to 7 even after being stored at 150 ° C. for 250 hours. Compared with the capacitor, the ESR was low.
- the capacitors of Comparative Examples 5 to 7 using an electrolytic solution had a large increase in ESR and poor heat resistance when stored at 150 ° C. for 250 hours, compared with the capacitors of Examples 11 to 17. That is, the capacitors of Examples 11 to 17 using the conductive auxiliary liquid having low conductivity were superior in heat resistance to the capacitors of Comparative Examples 5 to 7 using the electrolytic solution.
- the capacitors of Examples 11 to 17 were higher and superior to the capacitors of Comparative Examples 5, 6, and 8, and the capacitor of Comparative Example 7 And no degradation in characteristics regarding breakdown voltage was observed.
- Example 18 The same operation as in Example 11 was performed, and a capacitor element having a set ESR of 15 m ⁇ or less, a set capacitance of 50 ⁇ F or more, and a set breakdown voltage of 100 V or more was produced as in Example 11.
- the capacitor element was washed by immersing it in a 2% methanol solution of paratoluenesulfonic acid for 10 minutes, then immersed in pure water for 5 minutes, and then dried in a dryer set at 105 ° C. for 30 minutes. did.
- the capacitor element in which the conductive polymer is synthesized by so-called “in-situ polymerization” on the dielectric layer of the aluminum foil (the conductive polymer may adhere to other portions) is prepared as described above. It was immersed in the conductive auxiliary liquid prepared in Example 1, the capacitor element was impregnated with the conductive auxiliary liquid, taken out after 5 minutes, and this was covered with an exterior material to produce a wound aluminum electrolytic capacitor.
- Example 18 is the same as Example 18 except that the conductive auxiliary solution prepared in Preparation Examples 2 to 7 and the electrolytic solution prepared in Preparation Examples 11 to 13 were used separately in place of the conductive auxiliary solution prepared in Preparation Example 1.
- a wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1.
- Comparative Example 12 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 18 except that the conductive auxiliary liquid was not impregnated.
- wound aluminum electrolytic capacitors of Examples 19 to 24 and Comparative Examples 9 to 12 manufactured as described above (hereinafter referred to as “winding aluminum electrolytic capacitors” may be simplified and indicated as “capacitors” in some cases. ), ESR, capacitance and leakage current were measured in the same manner as described above. The results are shown in Table 7 in the same manner as in Table 1.
- the capacitors of Examples 18 to 24 had an ESR of 12.0 to 13.3 m ⁇ , satisfied a set ESR of 15 m ⁇ or less, and had a capacitance of 59.0 to 59.2 ⁇ F.
- the set capacitance was 50 ⁇ F, and the ESR was lower than the capacitors of Comparative Examples 9-11.
- the capacitors of Examples 18 to 24 and Comparative Examples 9 to 11 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution was used in combination with the conductive polymer.
- the ESR was lower than that of the capacitors of Comparative Examples 9 to 11 which were used in combination with a conductive polymer.
- the capacitor of Comparative Example 12 that was not impregnated with the conductive auxiliary liquid had higher (large) ESR, lower capacitance, and higher leakage current than the capacitors of Examples 18 to 24.
- the capacitors of Examples 18 to 24 have a breakdown voltage of 115 to 120 V and satisfy the set breakdown voltage of 100 V or more, and
- the ESR is lower than the capacitors of Comparative Examples 9 to 11, and as shown in Table 9, the capacitors of Examples 18 to 24 are those of Comparative Examples 9 to 11 even after being stored at 150 ° C. for 250 hours. Compared with the capacitor, the ESR was low.
- the capacitors of Comparative Examples 9 to 11 using an electrolytic solution had a large increase in ESR and poor heat resistance when stored at 150 ° C. for 250 hours, compared with the capacitors of Examples 18 to 24. That is, the capacitors of Examples 18 to 24 using the conductive auxiliary liquid with low conductivity were superior in heat resistance to the capacitors of Comparative Examples 9 to 11 using the electrolytic solution.
- the capacitors of Examples 18 to 24 were higher and superior to the capacitors of Comparative Examples 9 to 12, and the deterioration in characteristics regarding the breakdown voltage was recognized. I could't.
- Preparation Example 14 A conductive auxiliary liquid was prepared in the same manner as in Preparation Example 1, except that 20 g of butyl hydroxybenzenecarboxylate was further added.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. with a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 16 ⁇ S / cm.
- Preparation Example 15 A conductive auxiliary liquid was prepared in the same manner as in Preparation Example 3 except that 10 g of methacrylic acid and 10 g of glycidyl methacrylate were further added.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured under the condition of 25 ° C. using a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 9 ⁇ S / cm.
- Preparation Example 16 Except for further adding 20 g of acrylic acid, the same operation as in Preparation Example 3 was performed to prepare a conductive auxiliary liquid.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured under the condition of 25 ° C. using a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 10 ⁇ S / cm.
- Preparation Example 17 A conductive auxiliary liquid was prepared in the same manner as in Preparation Example 8, except that 20 g of ethyl hydroxybenzenecarboxylate was further added.
- this conductive auxiliary liquid When the conductivity of this conductive auxiliary liquid was measured at 25 ° C. using a conductivity measuring device (F-55) manufactured by Horiba, Ltd., the conductivity of this conductive auxiliary liquid was 540 ⁇ S / cm.
- conductive polymer dispersion (IV) 1 L of pure water was added to a 2 L separable flask equipped with a stirrer, and 190 g of sodium styrenesulfonate (170 g as styrenesulfonic acid) and 10 g of hydroxyethyl acrylate were added thereto. And 1g of ammonium persulfate was added to the solution as an oxidizing agent, and the polymerization reaction of styrenesulfonic acid and hydroxyethyl acrylate was performed for 12 hours.
- reaction solution is treated with an ultrafiltration device (Vivaflow 200 (trade name) manufactured by Sartorius Co., Ltd., molecular weight fraction 50,000) to remove free low-molecular components in the solution to a concentration of 3%.
- an ultrafiltration device Vivaflow 200 (trade name) manufactured by Sartorius Co., Ltd., molecular weight fraction 50,000
- the weight average molecular weight of the obtained copolymer of styrene sulfonic acid and hydroxyethyl acrylate estimated using dextran as a standard using a gel filtration column was 150,000.
- a 3% aqueous polystyrene sulfonic acid solution in the conductive polymer dispersion (I) a 3% aqueous solution of a copolymer of styrene sulfonic acid and hydroxyethyl acrylate was used. All the same operations as in Preparation Example (I) were performed to obtain a conductive polymer dispersion having a concentration of 2%.
- a conductive polymer dispersion (IV) was obtained by adjusting the pH to 3 by adding a 28% aqueous ammonia solution to the conductive polymer dispersion having a concentration of 2%.
- the average particle size was 130 nm.
- Example 25 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the conductive auxiliary liquid of Preparation Example 14 was used instead of the conductive auxiliary liquid of Preparation Example 1.
- Example 26 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the conductive auxiliary liquid of Preparation Example 15 was used instead of the conductive auxiliary liquid of Preparation Example 1.
- Example 27 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the conductive auxiliary liquid of Preparation Example 16 was used instead of the conductive auxiliary liquid of Preparation Example 1.
- Example 28 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the conductive auxiliary liquid of Preparation Example 17 was used instead of the conductive auxiliary liquid of Preparation Example 1.
- Example 29 instead of the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion, the conductive dispersion prepared in Preparation Example (IV) of the conductive polymer dispersion A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 1 except that the liquid dispersion (IV) was used.
- Example 30 Conductive polymer prepared in Preparation Example (IV) of Conductive Polymer Dispersion instead of Conductive Polymer Dispersion (I) prepared in Preparation Example (I) of Conductive Polymer Dispersion A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 3 except that the dispersion (IV) was used.
- Example 31 Conductive polymer prepared in Preparation Example (IV) of Conductive Polymer Dispersion instead of Conductive Polymer Dispersion (I) prepared in Preparation Example (I) of Conductive Polymer Dispersion A wound aluminum electrolytic capacitor was produced in the same manner as in Example 8 except that the dispersion (IV) was used.
- Example 32 In Example 32 and subsequent Examples 33 to 37, the capacitor element is formed using a pretreatment solution prior to providing the capacitor element with the conductive polymer dispersion. Since the pretreatment is performed, the preparation of the pretreatment solution (1), which is the basis of these pretreatment solutions, will be described first.
- Preparation example (1) of pretreatment solution (1) After adding 15 g of butyl hydroxybenzenecarboxylate and 5 g of 3-glycidoxypropyltrimethoxysilane to 500 g of ethanol in a 1 L beaker with a stirrer, add 5 g of polyethylene glycol 400, and then stir for 24 hours. Thus, a pretreatment solution (1) was prepared.
- the capacitor element pretreated with the pretreatment solution (1) is immersed in the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion. After a minute, it was taken out and dried at 150 ° C. for 30 minutes. This operation was performed twice to provide a conductive polymer on the dielectric layer of the anode of the capacitor element.
- the capacitor element provided with the conductive polymer as described above is immersed in the conductive auxiliary liquid prepared in Preparation Example 1, and the capacitor element is impregnated with the conductive auxiliary liquid, and is taken out after 5 minutes.
- a wound aluminum electrolytic capacitor was manufactured by packaging.
- Example 33 In the preparation example (1) of the pretreatment solution (1), in place of 5 g of hydroxybenzenecarboxylic acid butyl, pretreatment was performed except that 2 g of hydroxybenzenecarboxylic acid butyl ester and 3 g of hydroxybenzenecarboxylic acid methyl ester were added.
- the same procedure as in Preparation Example (1) of Preparation Solution (1) was performed to prepare a pretreatment solution (2), and all operations were carried out except that the capacitor element was pretreated with the pretreatment solution (2).
- the same operation as in Example 32 was performed to produce a wound aluminum electrolytic capacitor.
- Example 34 In the preparation example (1) of the pretreatment solution (1), in place of 5 g of hydroxybenzenecarboxylate, 4 g of hydroxybenzenecarboxylate and 1 g of hydroxybenzenecarboxylic acid were added, and the pretreatment solution ( The same operation as in Preparation Example (1) of 1) was performed to prepare a pretreatment solution (3), and the capacitor element was pretreated with the pretreatment solution (3). The same operation was performed to manufacture a wound aluminum electrolytic capacitor.
- Example 35 In Preparation Example (1) of the pretreatment solution (1), in place of 5 g of hydroxybenzenecarboxylate, 3 g of hydroxybenzenecarboxylate, 1 g of hydroxybenzenecarboxylate, and 1 g of hydroxybenzenecarboxylate were added. Are all prepared in the same manner as in Preparation Example (1) of Pretreatment Solution (1) to prepare Pretreatment Solution (4), and use the Pretreatment Solution (4) to remove the capacitor element. Except for the treatment, the same operation as in Example 32 was performed to produce a wound aluminum electrolytic capacitor.
- Example 36 instead of the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion, the conductive polymer prepared in Preparation Example (IV) of the conductive polymer dispersion was used.
- a wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 32 except that the molecular dispersion (IV) was used.
- Example 37 instead of the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion, the conductive polymer prepared in Preparation Example (IV) of the conductive polymer dispersion was used.
- a wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 35 except that the molecular dispersion (IV) was used.
- Example 38 In this Example 38 and the following Example 39, after the conductive polymer is provided on the capacitor element using the conductive polymer dispersion, the intermediate treatment solution is added before the conductive auxiliary liquid is impregnated. Since the capacitor element is processed by using, the preparation example (A) of the intermediate processing solution (A) is shown first.
- Preparation example (A) of intermediate treatment solution (A) After adding 15 g of hydroxybenzenecarboxylic acid butyl ester and 5 g of 3-glycidoxypropyltrimethoxysilane to 500 g of a solvent in which ethylene glycol and ethanol are mixed at a mass ratio of 1: 1 in a 1 L beaker with a stirrer.
- An intermediate treatment solution (A) was prepared by adding 5 g of polyethylene glycol 400 and then stirring for 24 hours.
- Example 2 a capacitor element similar to that in Example 1 was immersed in the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion, and was taken out after 5 minutes, and was removed at room temperature.
- the capacitor element was provided with a conductive polymer by drying for a minute.
- the capacitor element provided with the conductive polymer was immersed in the intermediate treatment solution (A), taken out after 1 minute, and dried at 170 ° C. for 30 minutes for intermediate treatment.
- the step of providing a conductive polymer on the capacitor element as described above and the subsequent treatment with the intermediate treatment solution (A) were performed once more. That is, the conductive polymer was provided on the capacitor element, and the subsequent intermediate treatment with the intermediate treatment solution was performed twice.
- the capacitor element is immersed in the conductive auxiliary liquid prepared in Preparation Example 1, and the capacitor element is impregnated with the conductive auxiliary liquid. After 5 minutes, the capacitor element is taken out and covered with an exterior material. Type aluminum electrolytic capacitors were manufactured.
- Example 39 Conductive polymer prepared in Preparation Example (IV) of Conductive Polymer Dispersion instead of Conductive Polymer Dispersion (I) prepared in Preparation Example (I) of Conductive Polymer Dispersion A wound aluminum electrolytic capacitor was produced in the same manner as in Example 38 except that the dispersion (IV) was used.
- wound aluminum electrolytic capacitor may be simplified and indicated as “capacitor”.
- ESR electrolytic capacitor
- capacitance and leakage current were set.
- Table 10 shows the types of the conductive auxiliary liquid, the conductive polymer dispersion, the pretreatment solution, and the intermediate treatment solution used in the capacitors of Examples 25 to 39.
- the measurement results of the above characteristics are shown in Table 11 in the same manner as in Table 1 above.
- the capacitors of Examples 25 to 39 had an ESR of 9.9 to 12.9 m ⁇ , satisfied a set ESR of 15 m ⁇ or less, and a capacitance of 58.1 to 58.4 ⁇ F. Thus, the set capacitance of 50 ⁇ F or more was satisfied.
- the capacitors of Examples 25 to 39 had lower ESR than the capacitors of Comparative Examples 1 to 3 using a dispersion liquid of a conductive polymer in the same manner as those.
- the ESR of the capacitors of Examples 25 to 39 is 9.9 to 12.9 m ⁇ as described above, while the ESR of the capacitors of Comparative Examples 1 to 3 is as shown in Table 1. 21.8-22.6 m ⁇ , and the capacitors of Examples 25-39 have lower ESR than the capacitors of Comparative Examples 1-3, and the capacitors of Examples 25-39 and Comparative Examples 1-3
- the capacitors of Examples 25 to 39 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution is used in combination with the conductive polymer also in the capacitors of Comparative Examples 1 to 3 in which the electrolytic solution is used in combination with the conductive polymer. ESR was lower than that of the capacitor.
- the capacitors of Examples 25 to 39 are impregnated with the conductive auxiliary liquid. Compared with the capacitor of Comparative Example 4 having no ESR, the ESR was low (small), the capacitance was large, and the leakage current was small. That is, as shown in Table 11, the capacitors of Examples 25 to 39 have an ESR of 9.9 to 12.9 m ⁇ , a capacitance of 58.1 to 58.4 ⁇ F, and a leakage current of 1.0 to 1.
- the capacitor of Comparative Example 4 has an ESR of 17.9 m ⁇ , a capacitance of 51.5 ⁇ F, and a leakage current of 4.3 ⁇ A as shown in Table 1.
- the capacitors of .about.39 had lower ESR, larger capacitance, and less leakage current than the capacitor of Comparative Example 4 not impregnated with the conductive auxiliary liquid.
- the capacitors of Examples 25 to 39 had breakdown voltages of 118 to 130 V and satisfied the set breakdown voltage of 100 V or more even after storage at a high temperature of 260 ° C. for 3 minutes. .
- the capacitors of Examples 25 to 39 have an ESR of 9.9 to 13.1 m ⁇ after being stored at 260 ° C. for 3 minutes as shown in Table 12, whereas the capacitors of Comparative Examples 1 to 3 are As shown in Table 2, the ESR after storage at 260 ° C. for 3 minutes is 24.5 to 29.9 m ⁇ , and the capacitors of Examples 25 to 39 are comparative examples 1 even after storage at 260 ° C. for 3 minutes. ESR was lower than the capacitors of ⁇ 3.
- the capacitors of Examples 25 to 39 have an ESR of 10.1 to 13.2 m ⁇ as shown in Table 13 after being stored at 150 ° C. for 250 hours, whereas the capacitors of Comparative Examples 1 to 3 are As shown in Table 3, the ESR after storage at 150 ° C. for 250 hours is 673.4 to 899.9 m ⁇ , and the capacitors of Examples 25 to 39 are comparative examples 1 to 3 even after storage at 150 ° C. for 250 hours. ESR was lower than 3 capacitors. After the storage at 150 ° C. for 250 hours, the capacitors of Comparative Examples 1 to 3 have a large increase in ESR, whereas the capacitors of Examples 25 to 39 have a small increase in ESR and excellent heat resistance. It was. That is, the capacitors of Examples 25 to 39 using the conductive auxiliary liquid having low conductivity were superior in heat resistance to the capacitors of Comparative Examples 1 to 3 using the electrolytic solution.
- the capacitors of Examples 25 to 39 have breakdown voltages of 118 to 130 V
- the capacitor of Comparative Example 1 is 98 V
- the capacitor of Comparative Example 2 is 108 V
- the capacitor of Comparative Example 4 is The breakdown voltage was higher than that of 92 V, which was equivalent to 118 V of the capacitor of Comparative Example 3. No deterioration in the characteristics regarding the breakdown voltage was observed, and the breakdown voltage was excellent.
- Example 40 The winding type aluminum electrolytic capacitors of Examples 1 to 10 and the winding type aluminum electrolytic capacitors of Examples 25 to 39 described so far use a conductive polymer dispersion to apply a conductive polymer to a capacitor element. Although these are wound aluminum electrolytic capacitors of the type to be provided, in these wound aluminum electrolytic capacitors, the immersion of the capacitor element in the conductive polymer dispersion is performed twice. On the other hand, in this Example 40 and the following Examples 41 to 47, the conductive polymer is provided in the capacitor element only by immersing the capacitor element in the dispersion liquid once. To produce a wound aluminum electrolytic capacitor. Hereinafter, Example 40 will be described in detail.
- a capacitor element having a set ESR of 15 m ⁇ or less, a set capacitance of 50 ⁇ F or more, and a set breakdown voltage (withstand voltage) of 100 V or more is prepared in Preparation Example (I) of the conductive polymer dispersion. It was immersed in the conductive polymer dispersion liquid (I), taken out after 5 minutes, and dried at 150 ° C. for 30 minutes to provide the capacitor element with the conductive polymer.
- the capacitor element is immersed in the conductive auxiliary liquid prepared in Preparation Example 1, the capacitor element is impregnated with the conductive auxiliary liquid, taken out after 5 minutes, and this is covered with an exterior material, and wound aluminum An electrolytic capacitor was manufactured.
- Example 41 A capacitor element similar to that in Example 40 was immersed in the pretreatment solution (1), taken out after 1 minute, and dried at 150 ° C. for 15 minutes for pretreatment.
- Example 40 Thereafter, the same operation as in Example 40 was performed to manufacture a wound aluminum electrolytic capacitor.
- Example 42 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 41 except that the pretreatment solution (4) was used instead of the pretreatment solution (1).
- Example 43 A capacitor element similar to that in Example 40 was immersed in the conductive polymer dispersion (I) prepared in Preparation Example (I) of the conductive polymer dispersion, taken out after 5 minutes, and dried at room temperature for 30 minutes. Thus, a conductive polymer was provided in the capacitor element.
- the capacitor element was dipped in the intermediate treatment solution (A), taken out after 1 minute, and dried at 170 ° C. for 30 minutes for intermediate treatment.
- the capacitor element is immersed in the conductive auxiliary liquid prepared in Preparation Example 1, the capacitor element is impregnated with the conductive auxiliary liquid, taken out after 5 minutes, and this is packaged with an exterior material, and wound aluminum An electrolytic capacitor was manufactured.
- Example 44 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 40 except that the conductive polymer dispersion (IV) was used instead of the conductive polymer dispersion (I). did.
- Example 45 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 41 except that the conductive polymer dispersion (IV) was used instead of the conductive polymer dispersion (I). did.
- Example 46 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 45 except that the pretreatment solution (4) was used instead of the pretreatment solution (1).
- Example 47 A wound aluminum electrolytic capacitor was manufactured in the same manner as in Example 43 except that the conductive polymer dispersion (IV) was used instead of the conductive polymer dispersion (1). did.
- wound aluminum electrolytic capacitor may be simplified and indicated as “capacitor”.
- ESR ESR
- capacitance ESR
- leakage current ESR
- Table 14 shows the types of the conductive auxiliary liquid, the conductive polymer dispersion, the pretreatment solution, and the intermediate treatment solution used in the capacitors of Examples 40 to 47.
- the measurement results of the above characteristics are shown in Table 15 in the same manner as in Table 1.
- the capacitors of Examples 40 to 47 have an ESR of 11.7 to 12.5 m ⁇ , satisfy a set ESR of 15 m ⁇ or less, and have a capacitance of 58.2 ⁇ F. The set capacitance of 50 ⁇ F or more was satisfied.
- the capacitors of Examples 40 to 47 had lower ESR than the capacitors of Comparative Examples 1 to 3 whose characteristics are shown in Table 1.
- the ESR of the capacitors of Examples 40 to 47 is 11.7 to 12.5 m ⁇ as described above, while the ESR of the capacitors of Comparative Examples 1 to 3 is 21 as shown in Table 1.
- the capacitors of Examples 40 to 47 have lower ESR than the capacitors of Comparative Examples 1 to 3, and the capacitors of Examples 40 to 47 and the capacitors of Comparative Examples 1 to 3 are low.
- the capacitors of Examples 40 to 47 in which the conductive auxiliary liquid having a lower conductivity than the electrolytic solution was used in combination with the conductive polymer were compared with the capacitors in Comparative Examples 1 to 3 in which the electrolytic solution was used in combination with the conductive polymer. , ESR was low.
- the capacitors of Examples 40 to 47 shown in Table 15 have an ESR of 11.7 to 12.5 m ⁇ .
- the capacitance is 58.2 ⁇ F and the leakage current is 0.7 to 1.0 ⁇ A
- the capacitor of Comparative Example 4 has an ESR of 17.9 m ⁇ and a capacitance of 51.5 ⁇ F.
- the capacitors of Examples 40 to 47 having a leakage current of 4.3 ⁇ A have lower ESR, larger capacitance, and leakage than the capacitors of Comparative Example 4 that are not impregnated with the conductive auxiliary liquid. The current was low.
- the capacitors of Examples 40 to 47 had a breakdown voltage of 121 to 134 V and satisfied a set breakdown voltage of 100 V or more. .
- the capacitors of Examples 40 to 47 have ESR of 11.7 to 127 m ⁇ after being stored at 260 ° C. for 3 minutes, whereas the capacitors of Comparative Examples 1 to 3 are those after being stored at 260 ° C. for 3 minutes.
- the ESR was 24.5 to 29.9 m ⁇ , and the capacitors of Examples 40 to 47 had lower ESR than the capacitors of Comparative Examples 1 to 3 even after storage at 260 ° C. for 3 minutes. It was.
- the ESR after storage at 150 ° C. for 250 hours is 12.2 to 13.3 m ⁇ as shown in Table 17, whereas the capacitors of Comparative Examples 1 to 3 are As shown in Table 3, the ESR after storage at 150 ° C. for 250 hours is 673.4 to 899.9 m ⁇ , and the capacitors of Examples 40 to 47 are comparative examples 1 even after storage at 150 ° C. for 250 hours. ESR was lower than the capacitors of ⁇ 3. After the storage at 150 ° C. for 250 hours, the capacitors of Comparative Examples 1 to 3 have a significant increase in ESR, whereas the capacitors of Examples 40 to 47 have a small increase in ESR and excellent heat resistance. It was. That is, the capacitors of Examples 40 to 47 using the conductive auxiliary liquid having a low conductivity were superior in heat resistance to the capacitors of Comparative Examples 1 to 3 using the electrolytic solution.
- the capacitors of Examples 40 to 47 have breakdown voltages of 121 to 134 V
- the capacitor of Comparative Example 1 is 98 V
- the capacitor of Comparative Example 2 is 108 V
- the capacitor of Comparative Example 4 is Compared to 92V
- the breakdown voltage was higher, equal to or higher than 118V of the capacitor of Comparative Example 3, and no deterioration in characteristics regarding breakdown voltage was observed, and the breakdown voltage was excellent.
- an electrolytic capacitor having low ESR, excellent heat resistance, and high reliability under high temperature conditions can be provided.
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Abstract
Description
で表される繰り返し単位を有するものが好ましく、このようなフェノールスルホン酸ノボラック樹脂としては、その重量平均分子量が5,000~500,000のものが好ましい。
撹拌装置付き1Lビーカー内に入れたγ-ブチロラクトン500gに50gのヒドロキシベンゼンカルボン酸と5gのニトロフェノールと1gの3-グリシドキシプロピルトリメトキシシランを添加した後、24時間撹拌することによって導電性補助液を調製した。
撹拌装置付き1Lビーカー内に入れたγ-ブチロラクトン500gに50gのヒドロキシベンゼンカルボン酸と10gのニトロフェノールと5gの3-グリシドキシプロピルトリメトキシシランを添加した後、24時間撹拌することによって導電性補助液を調製した。
撹拌装置付き1Lビーカー内に入れたエチレングリコール500gに50gのヒドロキシベンゼンカルボン酸と10gのニトロフェノールと5gの3-グリシドキシプロピルトリメトキシシランを添加した後、24時間撹拌することによって導電性補助液を調製した。
撹拌装置付き1Lビーカー内に入れたスルホラン500gに50gのヒドロキシベンゼンカルボン酸と10gのニトロフェノールと5gの3-グリシドキシプロピルトリメトキシシランを添加した後、24時間撹拌することによって導電性補助液を調製した。
ヒドロキシベンゼンカルボン酸の添加量を50gから75gに変更した以外は、すべて調製例1と同様の操作を行って、導電性補助液を調製した。
ヒドロキシベンゼンカルボン酸の添加量を50gから30gに変更した以外は、すべて調製例1と同様の操作を行って、導電性補助液を調製した。
さらに5gのポリエチレングリコール400を添加した以外は、すべて調製例1と同様の操作を行って、導電性補助液を調製した。
さらに8gのジメチルアミンを添加した以外は、すべて調製例7と同様の操作を行って導電性補助液を調製した。
さらに5gのグリセリンを添加した以外は、すべて調製例1と同様の操作を行って、導電性補助液を調製した。
さらに3gのアクリル酸ヒドロキシエチルを添加した以外は、すべて調製例1と同様の操作を行って導電性補助液を調製した。
撹拌装置付き1Lビーカー内に入れたγ-ブチロラクトン500gに50gのアジピン酸アンモニウムを添加した後、24時間撹拌することによって電解液を調製した。
さらに5gのグリセリンを添加した以外は、調製例11と同様の操作を行って電解液を調製した。
さらに5gの3-グリシドキシプロピルトリメトキシシランを添加した以外は、すべて調製例11と同様の操作を行って電解液を調製した。
テイカ社製ポリスチレンスルホン酸(重量平均分子量100、000)の3%水溶液600gを内容積1Lのステンレス鋼製容器に入れ、硫酸第一鉄・7水和物0.3gを添加し、その中に3,4-エチレンジオキシチオフェン4mLをゆっくり滴下した。
導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)の40gを撹拌機付きビーカーに入れ、撹拌しながら0.2gのヒドロキシベンゼンカルボン酸を添加した。しかし、数日撹拌してもヒドロキシベンゼンカルボン酸は溶解しなかった。
導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)の40gを撹拌機付きビーカーに入れ、撹拌しながら0.2gのニトロフェノールを添加した。しかし、数日撹拌してもニトロフェノールが溶解しなかった。
アルミニウム箔の表面をエッチング処理した後、化成処理を行ってアルミニウムの酸化被膜からなる誘電体層を形成した陽極にリード端子を取り付け、また、アルミニウム箔からなる陰極にリード端子を取り付け、それらのリード端子付き陽極と陰極とをセパレータを介して巻回して、コンデンサ素子を作製した。このコンデンサ素子は、ESRが15mΩ以下、静電容量が50μF以上、破壊電圧(耐電圧)が100V以上になるように設定したものである。
調製例1で調製した導電性補助液に代えて、調製例2~10で調製した導電性補助液および調製例11~13で調製した電解液をそれぞれ別々に用いた以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性補助液を含浸させることを行わなかった以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
HEWLETT PACKARD社製のLCRメーター(4284A)を用い、25℃の条件下で、100kHzで測定する。
静電容量:
HEWLETT PACKARD社製のLCRメーター(4284A)を用い、25℃の条件下で、120Hzで測定する。
漏れ電流:
巻回型アルミニウム電解コンデンサに、25℃で63Vの電圧を60秒間印加した後、デジタルオシロスコープにて漏れ電流を測定する。
アルミニウム箔の表面をエッチング処理した後、化成処理を行ってアルミニウムの酸化被膜からなる誘電体層を形成した陽極にリード端子を取り付け、また、アルミニウム箔からなる陰極にリード端子を取り付け、それらのリード端子付き陽極と陰極とをセパレータを介して巻回して、コンデンサ素子を作製した。このコンデンサ素子は、ESRが15mΩ以下、静電容量が50μF以上、破壊電圧(耐電圧)が100V以上になるように設定したものである。
調製例1で調製した導電性補助液に代えて、調製例2~7で調製した導電性補助液および調製例11~13で調製した電解液をそれぞれ別々に用いた以外は、すべて実施例11と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性補助液を含浸させることを行わなかった以外は、すべて実施例11と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
実施例11と同様の操作を行い、実施例11と同様に、設定ESRが15mΩ以下、設定静電容量が50μF以上、設定破壊電圧が100V以上のコンデンサ素子を作製した。
調製例1で調製した導電性補助液に代えて、調製例2~7で調製した導電性補助液および調製例11~13で調製した電解液をそれぞれ別々に用いた以外は、すべて実施例18と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性補助液を含浸させることを行わなかった以外は、すべて実施例18と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
ヒドロキシベンゼンカルボン酸ブチル20gをさらに添加した以外は、すべて調製例1と同様の操作を行って導電性補助液を調製した。
メタクリル酸10gとメタクリル酸グリシジル10gをさらに添加した以外は、すべて調製例3と同様の操作を行って導電性補助液を調製した。
アクリル酸20gをさらに添加した以外は、すべて調製例3と同様の操作を行って導電性補助液を調製した。
ヒドロキシベンゼンカルボン酸エチル20gをさらに添加した以外は、すべて調製例8と同様の操作を行って導電性補助液を調製した。
2Lの攪拌機付きセパラブルフラスコに1Lの純水を添加し、そこにスチレンスルホン酸ナトリウム190g(スチレンスルホン酸として170g)とアクリル酸ヒドロキシエチル10gを添加した。そして、その溶液に酸化剤として過硫酸アンモニウムを1g添加してスチレンスルホン酸とアクリル酸ヒドロキシエチルとの重合反応を12時間行った。
この導電性高分子の分散液(IV)中の導電性高分子の粒度分布を大塚電子製ELS-Zで測定したところ、平均粒径が130nmであった。
調製例1の導電性補助液に代えて、調製例14の導電性補助液を用いた以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
調製例1の導電性補助液に代えて、調製例15の導電性補助液を用いた以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
調製例1の導電性補助液に代えて、調製例16の導電性補助液を用いた以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
調製例1の導電性補助液に代えて、調製例17の導電性補助液を用いた以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
前記導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に代えて、導電性高分子の分散液の調製例(IV)で調製した導電性分散液の分散液(IV)を用いた以外は、すべて実施例1と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に代えて、導電性高分子の分散液の調製例(IV)で調製した導電性高分子の分散液(IV)を用いた以外は、すべて実施例3と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に代えて、導電性高分子の分散液の調製例(IV)で調製した導電性高分子の分散液(IV)を用いた以外は、すべて実施例8と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
この実施例32をはじめ、それに続く実施例33~37などでは、導電性高分子の分散液を用いてコンデンサ素子に導電性高分子を設けるに先立って、前処理用溶液を用いてコンデンサ素子を前処理するので、それらの前処理用溶液の基本となる前処理用溶液(1)の調製を先に示す。
撹拌装置付き1Lビーカー内に入れたエタノール500gに15gのヒドロキシベンゼンカルボン酸ブチルと5gの3-グリシドキシプロピルトリメトキシシランを添加した後、5gのポリエチレングリコール400を添加し、その後、24時間撹拌することによって、前処理用溶液(1)を調製した。
前記前処理用溶液(1)の調製例(1)において、ヒドロキシベンゼンカルボン酸ブチル5gに代えて、ヒドロキシベンゼンカルボン酸ブチルエステル2gとヒドロキシベンゼンカルボン酸メチルエステル3gを添加した以外は、すべて前処理用溶液(1)の調製例(1)と同様の操作を行って、前処理用溶液(2)を調製し、その前処理用溶液(2)でコンデンサ素子を前処理した以外は、すべて実施例32と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
前記前処理用溶液(1)の調製例(1)において、ヒドロキシベンゼンカルボン酸ブチル5gに代えて、ヒドロキシベンゼンカルボン酸ブチル4gとヒドロキシベンゼンカルボン酸1gを添加した以外は、すべて前処理用溶液(1)の調製例(1)と同様の操作を行って、前処理用溶液(3)を調製し、その前処理用溶液(3)でコンデンサ素子を前処理した以外は、すべて実施例32と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
前記前処理用溶液(1)の調製例(1)において、ヒドロキシベンゼンカルボン酸ブチル5gに代えて、ヒドロキシベンゼンカルボン酸ブチル3gとヒドロキシベンゼンカルボン酸エチル1gとヒドキシベンゼンカルボン酸1gを添加した以外は、すべて前処理用溶液(1)の調製例(1)と同様の操作を行って、前処理用溶液(4)を調製し、その前処理用溶液(4)を用いてコンデンサ素子を前処理した以外は、すべて実施例32と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
前記導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に代えて、導電性高分子の分散液の調製例(IV)で調製した導電性高分子の分散液(IV)を用いた以外は、すべて実施例32と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
前記導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に代えて、導電性高分子の分散液の調製例(IV)で調製した導電性高分子の分散液(IV)を用いた以外は、すべて実施例35と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
この実施例38や、それに続く実施例39では、導電性高分子の分散液を用いてコンデンサ素子に導電性高分子を設けた後、導電性補助液を含浸させる前に、中間処理用溶液を用いてコンデンサ素子を処理するので、その中間処理用溶液(A)の調製例(A)を先に示す。
撹拌装置付き1Lビーカー内に入れたエチレングリコールとエタノールが質量比で1:1で混合した溶媒500gに15gのヒドロキシベンゼンカルボン酸ブチルエステルと5gの3-グリシドキシプロピルトリメトキシシランを添加した後、5gのポリエチレングリコール400を添加し、その後、24時間撹拌することによって、中間処理用溶液(A)を調製した。
導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に代えて、導電性高分子の分散液の調製例(IV)で調製した導電性高分子の分散液(IV)を用いた以外は、すべて実施例38と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
これまで説明してきた実施例1~10の巻回型アルミニウム電解コンデンサや実施例25~39の巻回型アルミニウム電解コンデンサは、導電性高分子の分散液を用いてコンデンサ素子に導電性高分子を設けるタイプの巻回型アルミニウム電解コンデンサであるが、これらの巻回型アルミニウム電解コンデンサでは、コンデンサ素子の導電性高分子の分散液への浸漬を2回行っている。これに対して、この実施例40やそれに続く実施例41~47では、コンデンサ素子の導電性高分子の分散液への浸漬は1回行うだけでコンデンサ素子に導電性高分子を設け、それに基づいて巻回型アルミニウム電解コンデンサを製造する。以下、この実施例40について詳しく説明する。
上記実施例40と同様のコンデンサ素子を前記の前処理用溶液(1)に浸漬し、1分後に取り出し、150℃で15分間乾燥して前処理を行った。
前処理用溶液(1)に代えて、前処理用溶液(4)を用いた以外は、すべて実施例41と同様の操作を行って巻回型アルミニウム電解コンデンサを製造した。
実施例40と同様のコンデンサ素子を前記導電性高分子の分散液の調製例(I)で調製した導電性高分子の分散液(I)に浸漬し、5分後に取り出し、室温で30分間乾燥して、コンデンサ素子に導電性高分子を設けた。
導電性高分子の分散液(I)に代えて、導電性高分子の分散液(IV)を用いた以外は、すべて実施例40と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性高分子の分散液(I)に代えて、導電性高分子の分散液(IV)を用いた以外は、すべて実施例41と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
前処理用溶液(1)に代えて、前処理用溶液(4)を用いた以外は、すべて実施例45と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
導電性高分子の分散液(1)に代えて、導電性高分子の分散液(IV)を用いた以外は、すべて実施例43と同様の操作を行って、巻回型アルミニウム電解コンデンサを製造した。
Claims (9)
- 導電性高分子と導電性補助液とを含んで成り、前記導電性補助液が、沸点が150℃以上の高沸点有機溶剤と、ヒドロキシル基を少なくとも1つ有する芳香族系化合物とを含むことを特徴とする電解コンデンサ。
- 前記芳香族系化合物が、カルボキシル基を少なくとも1つ有する芳香族系化合物またはニトロ基を少なくとも1つ有する芳香族系化合物を含むことを特徴とする請求項1記載の電解コンデンサ。
- 前記芳香族系化合物が、カルボキシル基を少なくとも1つ有する芳香族系化合物とニトロ基を少なくとも1つ有する芳香族系化合物とを含むことを特徴とする請求項1記載の電解コンデンサ。
- 導電性補助液が、エポキシ化合物またはその加水分解物、シラン化合物またはその加水分解物およびポリアルコールよりなる群から選ばれる少なくとも1種を含むことを特徴とする請求項1~3のいずれかに記載の電解コンデンサ。
- 導電性補助液の導電率が、2mS/cm以下であることを特徴とする請求項1~4のいずれかに記載の電解コンデンサ。
- 弁金属とその表面に形成された前記弁金属の酸化被膜からなる誘電体層を有するコンデンサ素子に導電性高分子の分散液を用いて導電性高分子を設ける工程と、その後、そのコンデンサ素子に、沸点が150℃以上の高沸点有機溶剤と、ヒドロキシル基を少なくとも1つ有する芳香族系化合物とを含む導電性補助液を含浸させる工程とを経由することを特徴とする電解コンデンサの製造方法。
- 弁金属とその表面に形成された前記弁金属の酸化被膜からなる誘電体層を有するコンデンサ素子上でモノマーを化学酸化重合することにより導電性高分子を合成する工程と、洗浄により不純物を取り除いた後乾燥する工程と、その後、そのコンデンサ素子に、沸点が150℃以上の高沸点有機溶剤と、ヒドロキシル基を少なくとも1つ有する芳香族系化合物とを含む導電性補助液を含浸させる工程を経由することを特徴とする電解コンデンサの製造方法。
- 弁金属とその表面に形成された前記弁金属の酸化被膜からなる誘電体層を有するコンデンサ素子に導電性高分子の分散液を用いて導電性高分子を設けるに際して、その前処理として、前記コンデンサ素子を、ヒドロキシル基を少なくとも1つ有する環状有機化合物と沸点が150℃以上の高沸点溶剤が有機溶剤に溶解した溶液で処理する工程と、その前処理後のコンデンサ素子に導電性高分子の分散液を用いて導電性高分子を設ける工程と、その後、そのコンデンサ素子に、沸点が150℃以上の高沸点有機溶剤と、ヒドロキシル基を少なくとも1つ有する芳香族系化合物とを含む導電性補助液を含浸させる工程とを経由することを特徴とする電解コンデンサの製造方法。
- 弁金属とその表面に形成された前記弁金属の酸化被膜からなる誘電体層を有するコンデンサ素子に導電性高分子の分散液を用いて導電性高分子を設ける工程と、その後、そのコンデンサ素子を沸点が150℃以上の高沸点有機溶剤または沸点が150℃以上の高沸点有機溶剤を20質量%以上100%未満で含有する溶液で処理する工程と、その処理後のコンデンサ素子に、沸点が150℃以上の高沸点有機溶剤と、ヒドロキシル基を少なくとも1つ有する芳香族系化合物とを含む導電性補助液を含浸させる工程とを経由することを特徴とする電解コンデンサの製造方法。
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JP5259895B1 (ja) | 2013-08-07 |
US20140334066A1 (en) | 2014-11-13 |
CN105551801A (zh) | 2016-05-04 |
TW201342409A (zh) | 2013-10-16 |
CN105551801B (zh) | 2018-12-21 |
KR101660604B1 (ko) | 2016-09-27 |
CN104040658B (zh) | 2016-06-22 |
TWI536413B (zh) | 2016-06-01 |
KR20140107201A (ko) | 2014-09-04 |
CN104040658A (zh) | 2014-09-10 |
JPWO2013094462A1 (ja) | 2015-04-27 |
US9589738B2 (en) | 2017-03-07 |
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