Electrolyte for driving electrolytic capacitors

A technology of electrolytic capacitors and electrolytes, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of deterioration and oxidative deterioration of peripheral components such as sealants

Active Publication Date: 2017-06-06
JAPAN VAM & POVAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When these sodium components are present in the electrolytic solution, there is a problem that the pH of the electrolytic solution changes, causing deterioration of peripheral components such as sealants, and deterioration of the oxide film formed on the electrode.

Method used

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  • Electrolyte for driving electrolytic capacitors
  • Electrolyte for driving electrolytic capacitors
  • Electrolyte for driving electrolytic capacitors

Examples

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Effect test

Embodiment

[0057] Below, examples are given to further specifically illustrate the present invention, but the present invention is not limited by these examples, and those skilled in the art can make a large number of modifications within the technical idea of ​​the present invention. In the following examples and comparative examples, the PVA-based resin produced in the following production example 1 using each saponification catalyst shown in the following Table 1 as a saponification catalyst was used. It should be noted that PVA-based resins having different degrees of polymerization can be changed by adjusting the ratio of vinyl acetate monomer to methanol as a solvent and the polymerization yield when solution-polymerizing vinyl acetate monomer in the above-mentioned production examples. In addition, when copolymerizing an unsaturated monomer that can be copolymerized with vinyl acetate monomer, the unsaturated monomer is also added at one time at the beginning of the polymerization ...

manufacture example 1

[0060] After replacing the reactor with agitator, reflux condenser, nitrogen inlet pipe, thermometer and pressure gauge with nitrogen, drop into 2800 parts by mass of deoxidized vinyl acetate monomer and 800 parts by mass of methanol after deoxidation, and stir After starting to raise the temperature at the bottom to reach 60°C, add 50 parts by mass of an initiator (2,2'-azobis(2,4-dimethylvaleronitrile)) dissolved in 50 parts by mass of methanol that has been deoxygenated separately. Initiator solution to initiate polymerization. After polymerizing at 60° C. for 5 hours, cooling was performed to stop the polymerization. The solid content concentration in the polymerization solution at this time was 55.1% (71.8% in terms of polymerization yield). In addition, the obtained polyvinyl acetate resin was made into polyvinyl alcohol with a degree of saponification of 100 mol% and was prepared according to JIS K- The degree of polymerization obtained by measuring in 6726 (1994) was ...

manufacture example 2~24

[0062] Change the feeding ratio of vinyl acetate monomer and methanol, the amount of initiator, and the polymerization yield to prepare polyvinyl acetate-methanol solutions with different degrees of polymerization, and change the saponification catalyst to the type shown in Table 1 to perform saponification. When the saponified gel cannot be pulverized or is in a liquid state, it is directly dried, and after drying, it is pulverized into about 3 mm to about 10 mm. Except for this, the same operation as that of Production Example 1 was performed, and PVA2-24 shown in Table 1 were produced, respectively.

[0063] [Table 1]

[0064]

[0065] The saponification catalysts in Table 1 are as follows.

[0066] 1) tert-butylimino-tris(pyrrolidinyl)phosphorane

[0067] 2) 2-tert-butylimino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diacriphosphorin

[0068] 3) Tetramethylammonium hydroxide

[0069] 4) Benzyltrimethylammonium hydroxide

[0070] 5) 7-methyl-1,5,7-triazabicyclo[4.4....

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Abstract

The invention provides an electrolyte used for driving an electrolytic condenser. The electrolyte is an electrolyte containing PVA resinoid which can restrain degradation, has high security and good withstand voltage property. The electrolyte used for driving the electrolytic condenser is characterized by containing a solvent in which ethylene glycol is main composition, carboxylic acid or salt thereof and polyving akohol resinoid whose polymerization degree is 50-2000, saponification degree is 20.0-99.5 mol%, and sodium content is lower than 10 ppm.

Description

technical field [0001] The present invention relates to an electrolytic solution for driving an aluminum electrolytic capacitor for medium and high voltage use (hereinafter referred to simply as the electrolytic solution) using ethylene glycol as the main solvent. More specifically, the present invention provides (hereinafter abbreviated as PVA-based resin), which can suppress deterioration and is a highly safe electrolyte solution. Background technique [0002] In recent years, safety requirements for electrolytic capacitors have increased, and accordingly, it has become important to increase withstand voltage. In order to increase the withstand voltage, polymer compounds such as PVA-based resins are added to the electrolytic solution to increase the withstand voltage (Patent Documents 1 and 2). [0003] The representative industrial manufacturing method of PVA resin is the following method: make vinyl acetate carry out radical polymerization in methanol solvent as shown i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/035
Inventor 小原田明信木村佳弘
Owner JAPAN VAM & POVAL
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