Electrolyte for middle-high voltage aluminium electrolytic capacitor and preparation method thereof

A technology of aluminum electrolytic capacitors and electrolytic capacitors, applied in the direction of electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve problems such as increased moisture content, increased internal pressure of electrolytic capacitor components, and reduced service life at high temperatures to increase withstand voltage Effects of strength, low leakage current, and long life performance

Inactive Publication Date: 2017-09-22
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte prepared by using ethylene glycol + boric acid system will produce crystal water from boric acid, and a large amount of condensation water will be generated due to the esterification reaction between ethylene glycol and boric acid, which will cause the moisture content inside the electrolyte system to increase. When the electrolyte is used at a service temperature of 100°C, the water in the electrolyte will evaporate into water vapor, and the internal pressure of the electrolytic capacitor component will increase, which will eventually reduce its high-temperature service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The electrolytic solution for preparing a medium-high voltage aluminum electrolytic capacitor comprises the steps of:

[0016] (1) 5% nano-TiO will be added by mass percentage 2 , 9% ammonium azelate and 1.5% deionized water were added to 79% ethylene glycol solution, mixed evenly, and heated to 75°C;

[0017] (2) adding azelaic acid into the mixed solution of step (1), stirring evenly, after each raw material is fully dissolved, heating the solution to 100°C and stopping heating;

[0018] (3) After the temperature of the mixed solution in step (2) drops to 75°C, add 0.20% hydrogen suppressant, 0.40% inhibitor, 0.20% flash voltage agent, 0.20% leakage inhibitor, 0.20% Additives to improve the forming characteristics, mix evenly, and wait for it to cool naturally to room temperature, and then the electrolyte for aluminum electrolytic capacitors can be prepared.

[0019] Among them, polypropylene amine is selected as the hydrogen suppressor, phosphorous acid is selected...

Embodiment 2

[0021] The step of preparing the electrolytic solution of the medium and high voltage aluminum electrolytic capacitor is the same as that of Example 1, the difference lies in the proportioning (mass percentage): ethylene glycol 80%, deionized water 1.0%, nanometer TiO 2 3.5%, ammonium azelate 8.5%; azelaic acid 4.5%; hydrogen remover 0.25%, inhibitor 0.5%, flash fire voltage agent 0.25%, leakage current inhibitor 0.25%, additives to improve forming characteristics 0.25%.

[0022] Among them, polypropylene amine is selected as the hydrogen suppressor, phosphorous acid is selected as the inhibitor, citric acid is selected as the flash fire voltage agent, strontium nitrate is selected as the leakage current inhibitor, and maleic acid is selected as the additive to improve the formation characteristics.

Embodiment 3

[0024] The step of preparing the electrolytic solution of the medium and high voltage aluminum electrolytic capacitor is the same as that of Example 1, the difference lies in the proportioning (mass percentage): ethylene glycol 80%, deionized water 1.0%, nanometer TiO 2 4.5%, ammonium azelate 8.5%; azelaic acid 4.5%; hydrogen remover 0.25%, inhibitor 0.50%, flash fire voltage agent 0.25%, leakage current inhibitor 0.25%, additives to improve forming characteristics 0.25%.

[0025] Among them, polypropylene amine is selected as the hydrogen suppressor, phosphorous acid is selected as the inhibitor, citric acid is selected as the flash fire voltage agent, strontium nitrate is selected as the leakage current inhibitor, and maleic acid is selected as the additive to improve the formation characteristics.

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Abstract

The invention discloses electrolyte for a middle-high voltage aluminium electrolytic capacitor and a preparation method thereof. The electrolyte comprises the following components in percentage by mass: 79% to 80% of ethylene glycol, 1.0% to 1.5% of deionized water, 3.5% to 5% of nano TiO2, 8% to 9% of ammonium azelate, 4.0% to 4.5% of azelaic acid, 0.20% to 0.25% of hydrogen removal agent, 0.40% to 0.50% of stopping agent, 0.20% to 0.25% of sparking voltage agent, 0.20% to 0.25% of leakage current inhibitor and 0.20% to 0.25% of additive for improving forming characteristics. By adopting the technical scheme, a sparking voltage and cation repair oxidation capacity of the electrolyte can be improved, precipitation of hydrogen and generation of water in the working process are reduced, quality of the electrolyte is improved, and management and control of European Union REACH regulations on boric acid substances are met.

Description

technical field [0001] The invention relates to the field of electrolytes for aluminum electrolytic capacitors, in particular to an electrolyte for medium and high voltage aluminum electrolytic capacitors and a preparation method thereof. Background technique [0002] At present, aluminum electrolytic capacitors at home and abroad widely use ethylene glycol + borate system to prepare aluminum electrolytic capacitor electrolyte. The electrolyte prepared by this method has the advantages of relatively mature technology, simple operation of the preparation process, low preparation cost and easy purchase in the market, and can meet the electrical performance of capacitors in general working conditions. However, the electrolyte prepared by using ethylene glycol + boric acid system will produce crystal water from boric acid, and a large amount of condensation water will be generated due to the esterification reaction between ethylene glycol and boric acid, which will cause the moi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/035H01G9/145
CPCH01G9/035H01G9/145
Inventor 杨富国杨飞张玉红
Owner FOSHAN UNIVERSITY
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