CN113593908B - Aluminum electrolytic capacitor electrolyte, preparation method thereof and aluminum electrolytic capacitor - Google Patents
Aluminum electrolytic capacitor electrolyte, preparation method thereof and aluminum electrolytic capacitor Download PDFInfo
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- CN113593908B CN113593908B CN202110845422.9A CN202110845422A CN113593908B CN 113593908 B CN113593908 B CN 113593908B CN 202110845422 A CN202110845422 A CN 202110845422A CN 113593908 B CN113593908 B CN 113593908B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 85
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 77
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000003792 electrolyte Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 230000007797 corrosion Effects 0.000 claims abstract description 72
- 238000005260 corrosion Methods 0.000 claims abstract description 72
- 239000003112 inhibitor Substances 0.000 claims abstract description 48
- 150000001408 amides Chemical class 0.000 claims abstract description 9
- -1 nitrogenous amine Chemical class 0.000 claims abstract description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 30
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 17
- 239000004327 boric acid Substances 0.000 claims description 17
- 239000000654 additive Substances 0.000 claims description 13
- GJYJYFHBOBUTBY-UHFFFAOYSA-N alpha-camphorene Chemical compound CC(C)=CCCC(=C)C1CCC(CCC=C(C)C)=CC1 GJYJYFHBOBUTBY-UHFFFAOYSA-N 0.000 claims description 12
- SATJMZAWJRWBRX-UHFFFAOYSA-N azane;decanedioic acid Chemical compound [NH4+].[NH4+].[O-]C(=O)CCCCCCCCC([O-])=O SATJMZAWJRWBRX-UHFFFAOYSA-N 0.000 claims description 12
- VCGNYVLXYFKXCS-UHFFFAOYSA-N azanium;docosanoate Chemical compound [NH4+].CCCCCCCCCCCCCCCCCCCCCC([O-])=O VCGNYVLXYFKXCS-UHFFFAOYSA-N 0.000 claims description 11
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 10
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 10
- 229930195725 Mannitol Natural products 0.000 claims description 10
- KLIDOSBTXDALBI-UHFFFAOYSA-N ammonium nonanoate Chemical compound [NH4+].CCCCCCCCC([O-])=O KLIDOSBTXDALBI-UHFFFAOYSA-N 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 235000010355 mannitol Nutrition 0.000 claims description 10
- 239000000594 mannitol Substances 0.000 claims description 10
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- 229920001223 polyethylene glycol Polymers 0.000 claims description 9
- JKTYGPATCNUWKN-UHFFFAOYSA-N 4-nitrobenzyl alcohol Chemical group OCC1=CC=C([N+]([O-])=O)C=C1 JKTYGPATCNUWKN-UHFFFAOYSA-N 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 5
- 239000003755 preservative agent Substances 0.000 claims description 4
- 239000002516 radical scavenger Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229940068918 polyethylene glycol 400 Drugs 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 229940067597 azelate Drugs 0.000 claims description 2
- 239000003623 enhancer Substances 0.000 claims description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 18
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 8
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- IFZOPNLVYZYSMQ-UHFFFAOYSA-N 2-[2-[2-[2-(2-aminoethoxy)ethoxy]ethoxy]ethoxy]ethanamine Chemical group NCCOCCOCCOCCOCCN IFZOPNLVYZYSMQ-UHFFFAOYSA-N 0.000 description 1
- FOOPZYBJIJNBLQ-UHFFFAOYSA-N 2-[2-[2-[2-[2-(2-aminoethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethanamine Chemical group NCCOCCOCCOCCOCCOCCN FOOPZYBJIJNBLQ-UHFFFAOYSA-N 0.000 description 1
- QNNWDQWXZAXENQ-UHFFFAOYSA-N 2-[2-[2-[2-[2-[2-[2-[2-(2-aminoethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanamine Chemical group NCCOCCOCCOCCOCCOCCOCCOCCOCCN QNNWDQWXZAXENQ-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920000805 Polyaspartic acid Polymers 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 125000003354 benzotriazolyl group Chemical group N1N=NC2=C1C=CC=C2* 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 108010064470 polyaspartate Proteins 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010998 test method Methods 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor electrolyte, a preparation method thereof and an aluminum electrolytic capacitor, wherein the aluminum electrolytic capacitor electrolyte comprises the following components: the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
Description
Technical Field
The invention relates to the technical field of aluminum electrolytic capacitors, in particular to an aluminum electrolytic capacitor electrolyte, a preparation method thereof and an aluminum electrolytic capacitor.
Background
In the process of a high-temperature load life experiment, the anode corrosion is poor in medium-high voltage aluminum electrolytic capacitors with the voltage of more than 200V. Impurities carried in during the production of the capacitor and impurities contained in the electrolyte itself, which are mainly Cl-containing electrolyte with a small ionic radius, are the main causes of corrosion of the capacitor anode - And SO 4 2- They can, on the one hand, hinder the formation of metal passivation films; on the other hand, because the radius is small and the penetrating power is strong, the protective film formed on the metal surface is easy to damage, and the anode leading-out strip and the aluminum foil are easy to corrode locally in the using process of the capacitor. Excessive moisture in the electrolyte and excessive electrolyte remaining in the capacitor are also important factors for anode corrosion, the excessive moisture easily damages the oxide film structure, and the salt generated by corrosion is hydrolyzed to form Al (OH) 3 Excessive electrolyte tends to convert the initial electrochemical corrosion to pure chemistryCorrosion conversion aggravates anodic corrosion of the capacitor.
The anode corrosion phenomenon can reduce the service life of the capacitor and improve the use cost.
Disclosure of Invention
Based on the above, in order to solve the above problems, the present invention provides an electrolyte for an aluminum electrolytic capacitor.
The invention also provides a preparation method of the electrolyte of the aluminum electrolytic capacitor.
The invention also provides an aluminum electrolytic capacitor.
An electrolyte of an aluminum electrolytic capacitor comprises the following components: the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
the nitrogenous amine or amide corrosion inhibitor is added into the electrolyte of the aluminum electrolytic capacitor, the charge state and the interface property of the metal surface are changed through the adsorption effect of the polar groups in the corrosion inhibitor molecules, the corrosion speed of the metal is slowed down, a layer of protective film is formed on the metal surface by the nonpolar groups on the corrosion inhibitor molecules adsorbed on the metal surface, and the charge or substance transfer related to the corrosion reaction is blocked, so that the corrosion resistance of the working electrolyte is improved, the corrosion resistance of the aluminum electrolytic capacitor prepared by the electrolyte is correspondingly improved, and the service life of the aluminum electrolytic capacitor can be prolonged.
In one embodiment, the electrolyte of the aluminum electrolytic capacitor comprises the following components in parts by weight: 45-85 parts of solvent, 10-35 parts of solute, 0.01-10 parts of corrosion inhibitor and 2-10 parts of additive.
In one embodiment, the solvent is one or a combination of more of ethylene glycol, benzyl alcohol, ethylene glycol monomethyl ether and ethylene glycol monobutyl ether.
In one embodiment, the solute is one or a combination of boric acid, ammonium sebacate, ammonium azelate and ammonium behenate.
In one embodiment, the additives include a hydrogen scavenger, a flash fire enhancer, and a water repellant.
In one embodiment, the dehydrogenation agent is p-nitrobenzyl alcohol, the flash fire promoting agent is polyethylene glycol with an average molecular weight of 200-1000, and the waterproof agent is one or a combination of phosphorous acid, hypophosphorous acid and ammonium hypophosphite.
In one embodiment, the additive further comprises a preservative.
The invention also provides an electrolyte of the aluminum electrolytic capacitor, which comprises the following components: ethylene glycol, polyethylene glycol 400, benzyl alcohol, ethylene glycol monobutyl ether, boric acid, mannitol, ammonium sebacate, ammonium pelargonate, ammonium behenate, ammonium hypophosphite, p-nitrobenzol and a corrosion inhibitor, wherein the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
the invention also provides a preparation method of the electrolyte of the aluminum electrolytic capacitor, which comprises the following steps:
heating the solvent to 120-140 ℃, adding boric acid, and stirring for the first time under heat preservation;
cooling to 100-120 ℃, adding solute and additive, keeping the temperature, stirring for a second time, and cooling to normal temperature to obtain working electrolyte A;
adding a corrosion inhibitor into the working electrolyte A, and stirring at the constant temperature of 60-100 ℃ for a third time to obtain the electrolyte of the aluminum electrolytic capacitor.
The invention also provides an aluminum electrolytic capacitor, which is formed by immersing the aluminum electrolytic capacitor core cladding into the aluminum electrolytic capacitor electrolyte.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components: the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
further, the electrolyte of the aluminum electrolytic capacitor comprises the following components in parts by weight: 45-85 parts of solvent, 10-35 parts of solute, 0.01-10 parts of corrosion inhibitor and 2-10 parts of additive.
For example, 45 parts, 48 parts, 50 parts, 55 parts, 60 parts, 67 parts, 70 parts, 75 parts, 80 parts, and 85 parts of the solvent; 10 parts, 15 parts, 18 parts, 20 parts, 23 parts, 28 parts, 30 parts, 32 parts and 35 parts of solute; 0.01 part, 0.1 part, 0.5 part, 1 part, 2 parts, 3 parts, 4 parts, 6 parts, 8 parts and 10 parts of corrosion inhibitor; additives 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts and 10 parts.
Wherein, the solvent is one or a combination of more of ethylene glycol, benzyl alcohol, ethylene glycol monomethyl ether and ethylene glycol monobutyl ether.
The solute is one or more of boric acid, ammonium sebacate, ammonium pelargonate and ammonium behenate.
The additive comprises a hydrogen eliminating agent, a flash fire promoting agent and a waterproof mixture. The hydrogen eliminating agent has the function of eliminating hydrogen and improves the capability of inhibiting gas production of the electrolyte. The sparking improver can improve the sparking voltage of the electrolyte and enhance the voltage endurance capacity of the capacitor. The waterproof agent mainly plays a role in protecting an oxide film on the surface of the aluminum foil.
For example, the hydrogen scavenger is p-nitrobenzyl alcohol, the flash fire promoting agent is polyethylene glycol with the average molecular weight of 200-1000, and the waterproof agent is one or a combination of more of phosphorous acid, hypophosphorous acid and ammonium hypophosphite.
The additives mentioned above also include preservatives. The preservative can be mannitol.
For example, the invention provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components: ethylene glycol, polyethylene glycol 400, benzyl alcohol, ethylene glycol monobutyl ether, boric acid, mannitol, ammonium sebacate, ammonium pelargonate, ammonium behenate, ammonium hypophosphite, p-nitrobenzol and a corrosion inhibitor, wherein the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
the aluminum electrolytic capacitor electrolyte has the advantages that through the compounding and interaction of all the components, the obtained aluminum electrolytic capacitor electrolyte has high quality and good corrosion resistance.
The electrolyte of the aluminum electrolytic capacitor is added with the nitrogenous amine or amide corrosion inhibitor, the charge state and the interface property of the metal surface are changed through the adsorption effect of the polar groups in the corrosion inhibitor molecules, the corrosion speed of the metal is slowed down, a layer of protective film is formed on the metal surface by the nonpolar groups on the corrosion inhibitor molecules adsorbed on the metal surface to block the transfer of charges or substances related to corrosion reaction, thereby improving the corrosion resistance of the working electrolyte, correspondingly improving the corrosion resistance of the aluminum electrolytic capacitor prepared by the electrolyte, can prolong the service life of the aluminum electrolytic capacitor, the probability of corrosion of the prepared aluminum electrolytic capacitor is reduced from 20 percent to below 1 percent, even no corrosion occurs, the corrosion probability is far less than 1% in the workshop batch life test process, and the service life of the aluminum electrolytic capacitor is prolonged from 105 ℃ to 2000H to more than 105 ℃ to 5000H.
The invention also provides a preparation method of the electrolyte of the aluminum electrolytic capacitor, which comprises the following steps:
heating the solvent to 120-140 ℃, adding boric acid, and stirring for the first time under heat preservation;
cooling to 100-120 ℃, adding solute and additive, keeping the temperature, stirring for a second time, and cooling to normal temperature to obtain working electrolyte A;
adding a corrosion inhibitor into the working electrolyte A, and stirring at the constant temperature of 60-100 ℃ for a third time to obtain the electrolyte of the aluminum electrolytic capacitor.
Wherein the first time is 40min-80min, the second time is 40min-80min, and the third time is 30min-120 min.
The stirring speed after the corrosion inhibitor is added is controlled between 300RPM and 1500 RPM.
The invention also provides an aluminum electrolytic capacitor, which is formed by immersing the aluminum electrolytic capacitor core cladding into the electrolyte of the aluminum electrolytic capacitor for impregnation.
Specifically, the preparation method of the aluminum electrolytic capacitor comprises the following steps: and taking the aluminum electrolytic capacitor core cladding, impregnating in the electrolyte of the aluminum electrolytic capacitor according to a normal impregnation process, then assembling, sealing, electrifying and aging to obtain the aluminum electrolytic capacitor.
Embodiments of the present invention will be further illustrated by the following examples.
Example one
The embodiment provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 56.9 parts of ethylene glycol, 4002 parts of polyethylene glycol, 1.5 parts of benzyl alcohol, 12 parts of ethylene glycol monobutyl ether, 2.3 parts of boric acid, 1.7 parts of mannitol, 2.5 parts of ammonium sebacate, 0.5 part of ammonium pelargonate, 20 parts of ammonium docosanoate, 0.1 part of ammonium hypophosphite, 0.5 part of p-nitrobenzol and 1 part of corrosion inhibitor. Wherein the corrosion inhibitor is 1, 26-diamino-3, 6, 9, 12, 15, 18, 21, 24-octaoxahexacosane.
Example two
The embodiment provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 45 parts of ethylene glycol monomethyl ether, 5 parts of boric acid, 10 parts of ammonium pelargonate, 1 part of p-nitrobenzyl alcohol, 4000.5 parts of polyethylene glycol, 0.5 part of hypophosphorous acid and 0.5 part of corrosion inhibitor. Wherein the corrosion inhibitor is 1, 23-diamino-3, 6, 9, 12, 15, 18, 21-hexaoxaditridecane.
EXAMPLE III
The embodiment provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 30 parts of benzyl alcohol, 35 parts of ethylene glycol monomethyl ether, 2 parts of boric acid, 6 parts of ammonium sebacate, 2 parts of ammonium docosanoate, 1 part of mannitol, 3 parts of p-nitrobenzyl alcohol, 2002 parts of polyethylene glycol, 2 parts of ammonium hypophosphite and 0.01 part of corrosion inhibitor. Wherein the corrosion inhibitor is 1, 20-diamino-3, 6, 9, 12, 15, 18-hexaoxaeicosane.
Example four
The embodiment provides an aluminum electrolytic capacitor electrolyte, which comprises the following components in parts by weight: 45 parts of ethylene glycol monomethyl ether, 40 parts of ethylene glycol monobutyl ether, 10 parts of boric acid, 10 parts of ammonium pelargonate, 15 parts of ammonium sebacate, 2 parts of p-nitrobenzyl alcohol, 2003 parts of polyethylene glycol, 5 parts of hypophosphorous acid and 10 parts of corrosion inhibitor. Wherein the corrosion inhibitor is 1, 17-diamino-3, 6, 9, 12, 15-pentaoxaheptadecane.
EXAMPLE five
The embodiment provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 20 parts of ethylene glycol, 15 parts of boric acid, 2 parts of mannitol, 3 parts of ammonium hypophosphite and 0.02 part of corrosion inhibitor. Wherein the corrosion inhibitor is 1, 14-diamino-3, 6, 9, 12-tetraoxatetradecane.
Comparative example 1
The comparative example provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 56.9 parts of ethylene glycol, 4002 parts of polyethylene glycol, 1.5 parts of benzyl alcohol, 12 parts of ethylene glycol monobutyl ether, 2.3 parts of boric acid, 1.7 parts of mannitol, 2.5 parts of ammonium sebacate, 0.5 part of ammonium pelargonate, 20 parts of ammonium docosanoate, 0.1 part of ammonium hypophosphite, 0.5 part of p-nitrobenzol and 1 part of corrosion inhibitor. Wherein the corrosion inhibitor is polyaspartic acid.
Comparative example No. two
The comparative example provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 40 parts of gamma-butyrolactone, 30.4 parts of butyl acetate, 2.3 parts of boric acid, 1.7 parts of mannitol, 2.5 parts of ammonium sebacate, 0.5 part of ammonium pelargonate, 20 parts of ammonium docosanoate, 0.1 part of ammonium hypophosphite, 0.5 part of p-nitrobenzyl alcohol and 1 part of corrosion inhibitor. Wherein the corrosion inhibitor is benzotriazole.
Comparative example No. three
The comparative example provides an aluminum electrolytic capacitor electrolyte, which comprises the following components in parts by weight: 40 parts of gamma-butyrolactone, 30.4 parts of butyl acetate, 27 parts of organic carboxylic acid, 0.5 part of p-nitrobenzol and 1 part of corrosion inhibitor. Wherein the corrosion inhibitor is organic phosphate.
Comparative example No. four
The comparative example provides an electrolyte of an aluminum electrolytic capacitor, which comprises the following components in parts by weight: 56.9 parts of ethylene glycol, 4002 parts of polyethylene glycol, 1.5 parts of benzyl alcohol, 12 parts of ethylene glycol monobutyl ether, 2.3 parts of boric acid, 1.7 parts of mannitol, 2.5 parts of ammonium sebacate, 0.5 part of ammonium pelargonate, 20 parts of ammonium docosanoate, 0.1 part of ammonium hypophosphite and 0.5 part of p-nitrobenzyl alcohol.
The above examples and comparative examples will be tested below to compare the relevant technical data.
The test conditions were as follows:
specification and size of the aluminum electrolytic capacitor: 450V 820. mu.F.phi.35 x 50 mm.
High temperature load test conditions: the temperature is 105 ℃, the frequency is 120Hz, the ripple current is 2.5A/pcs, and the voltage is rated voltage.
Test data and analysis:
the life test method of the aluminum electrolytic capacitor comprises the steps of respectively manufacturing the electrolyte in each embodiment and the electrolyte in proportion into the capacitor, sampling 20 samples, and carrying out life test in a constant-temperature convection oven at 105 ℃.
The experimental results are shown in the table I.
Watch 1
| Group of | Life time (Hr) | Number of corrosion (pcs) | Corrosion ratio (%) |
| Example one | 5500 | 0 | 0％ |
| Example two | 5000 | 2 | 0.1％ |
| EXAMPLE III | 5000 | 1 | 0.05％ |
| Example four | 5000 | 3 | 0.15％ |
| EXAMPLE five | 5000 | 2 | 0.1％ |
| Comparative example 1 | 3500 | 8 | 40％ |
| Comparative example No. two | 4000 | 5 | 25％ |
| Comparative example No. three | 4000 | 5 | 25％ |
| Comparative example No. four | 2500 | 20 | 100％ |
When the service life test is carried out to 2500H, the power supply of the comparative example IV alarms, the aluminum electrolytic capacitor is taken out to test the basic parameters of the aluminum electrolytic capacitor, the capacity of the aluminum electrolytic capacitor is very low, the loss is very large, the disassembly analysis shows that the joint of the leading strip and the cover plate is seriously corroded, and even a disconnected serious defective product exists. Adding specific corrosion inhibitor, wherein power supply is not alarmed in the first to fifth embodiments, and continuing the test; the power supplies of comparative examples one to three did not alarm. When the power supply voltage reaches 5000H, the power supply parameters of the first embodiment to the fifth embodiment are slightly changed, and the parameters are not abnormal; one guide strip has tiny corrosion traces after disassembly; after disassembly, other comparative examples also have corresponding corrosion phenomena, but all the comparative examples are not as serious as the comparative example four. From the above results, it is understood that the corrosion resistance of the electrolyte for aluminum capacitors and the capacitor according to the present invention is greatly improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The electrolyte of the aluminum electrolytic capacitor is characterized by comprising the following components: the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
2. the electrolyte for the aluminum electrolytic capacitor as claimed in claim 1, which comprises the following components in parts by weight: 45-85 parts of solvent, 10-35 parts of solute, 0.01-10 parts of corrosion inhibitor and 2-10 parts of additive.
3. The electrolyte of the aluminum electrolytic capacitor according to claim 1, wherein the solvent is one or a combination of ethylene glycol, benzyl alcohol, ethylene glycol monomethyl ether and ethylene glycol monobutyl ether.
4. The aluminum electrolytic capacitor electrolyte as recited in claim 1, wherein the solute is one or a combination of boric acid, ammonium sebacate, ammonium azelate and ammonium behenate.
5. The aluminum electrolytic capacitor electrolyte of claim 1, wherein the additives include a hydrogen scavenger, a flash fire enhancer, and a water repellant.
6. The electrolyte of an aluminum electrolytic capacitor as recited in claim 5, wherein the hydrogen scavenger is p-nitrobenzyl alcohol, the flash promoter is polyethylene glycol with an average molecular weight of 200-1000, and the waterproof agent is one or more of phosphorous acid, hypophosphorous acid and ammonium hypophosphite.
7. The aluminum electrolytic capacitor electrolyte of claim 5, wherein the additive further comprises a preservative.
8. The electrolyte of the aluminum electrolytic capacitor is characterized by comprising the following components: ethylene glycol, polyethylene glycol 400, benzyl alcohol, ethylene glycol monobutyl ether, boric acid, mannitol, ammonium sebacate, ammonium pelargonate, ammonium behenate, ammonium hypophosphite, p-nitrobenzol and a corrosion inhibitor, wherein the corrosion inhibitor is a nitrogenous amine or amide corrosion inhibitor and has the following structure:
9. a method for preparing the electrolyte of an aluminum electrolytic capacitor according to any one of claims 1 to 7, comprising the steps of:
heating the solvent to 120-140 ℃, adding boric acid, and stirring for the first time under heat preservation;
cooling to 100-120 ℃, adding solute and additive, keeping the temperature, stirring for a second time, and cooling to normal temperature to obtain working electrolyte A;
adding a corrosion inhibitor into the working electrolyte A, and stirring at the constant temperature of 60-100 ℃ for a third time to obtain the electrolyte of the aluminum electrolytic capacitor.
10. An aluminum electrolytic capacitor, characterized in that the aluminum electrolytic capacitor is formed by immersing an aluminum electrolytic capacitor core package in the electrolyte of the aluminum electrolytic capacitor according to any one of claims 1 to 8.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03188613A (en) * | 1989-06-27 | 1991-08-16 | Nichicon Corp | Electrolyte for driving electrolytic capacitor |
| CN101556867A (en) * | 2009-05-20 | 2009-10-14 | 广东风华高新科技股份有限公司 | Electrolysis solution and preparation method thereof as well as preparation method for obtained aluminum capacitor |
| CN103633396A (en) * | 2013-07-31 | 2014-03-12 | 河南科技大学 | Electrolyte corrosion inhibitor for aluminum-air cell, electrolyte and preparation method |
| CN112038102A (en) * | 2020-08-24 | 2020-12-04 | 东莞东阳光科研发有限公司 | Preparation method of ultrahigh-pressure corrosion foil |
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2021
- 2021-07-26 CN CN202110845422.9A patent/CN113593908B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03188613A (en) * | 1989-06-27 | 1991-08-16 | Nichicon Corp | Electrolyte for driving electrolytic capacitor |
| CN101556867A (en) * | 2009-05-20 | 2009-10-14 | 广东风华高新科技股份有限公司 | Electrolysis solution and preparation method thereof as well as preparation method for obtained aluminum capacitor |
| CN103633396A (en) * | 2013-07-31 | 2014-03-12 | 河南科技大学 | Electrolyte corrosion inhibitor for aluminum-air cell, electrolyte and preparation method |
| CN112038102A (en) * | 2020-08-24 | 2020-12-04 | 东莞东阳光科研发有限公司 | Preparation method of ultrahigh-pressure corrosion foil |
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