Electrolyte for flame-retardant wide-temperature high-voltage aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention provides a working electrolyte for a flame-retardant wide-temperature high-voltage aluminum electrolytic capacitor, which comprises the following components in percentage by weight: 45-80% of main solvent, 0.1-5% of oxidation film stabilizer, 5-15% of secondary solvent, 0.2-3% of hydrogen absorption agent, 5-10% of solute, 5-15% of flame retardant and 5-15% of spark voltage increasing agent. The invention also provides a preparation method of the electrolyte and application of the electrolyte in preparation of a high-voltage electrolytic capacitor. In the electrolyte, appropriate solvent combination is adopted, thus the wide temperature from -40 DEG C to 105 DEG C is realized; a composite solute of an organic carboxylate with a branched chain and a straight-chain carboxylate with a long carbon chain is adopted, thus the stability is ensured, and the cost is controlled; the appropriate spark voltage increasing agent, oxidation film stabilizer and hydrogen absorption agent are added, thus the spark voltage of the electrolyte is increased, and the characteristic parameters of the aluminum electrolytic capacitor are not deteriorated after the aluminum electrolytic capacitor is used for a long time; and the flame retardant is added, thus the aluminum electrolytic capacitor is difficult to burn after striking fire.

Description

technical field [0001] The application of the present invention relates to a flame-retardant wide-temperature high-voltage aluminum electrolytic capacitor working electrolyte and its preparation method and application, belonging to the field of capacitor technology. Background technique [0002] In recent years, due to the worldwide energy shortage, complete machines such as inverters and inverter air conditioners for the purpose of energy saving have developed rapidly. As a key electronic component, the high-voltage aluminum electrolytic capacitor used for input filtering in this type of machine is usually used in series and parallel combinations, so it has high requirements for safety and reliability. More than 50% of the demand has been imported. Although domestic capacitors are also used, explosions and even serious consequences of burning often occur. On the one hand, in order to reduce costs, inverter manufacturers have a strong demand for domestic high-voltage electr...

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Problems solved by technology

However, since the dimethyl methylphosphonate used as a flame retardant is mainly synthesized from phosphorus trichloride and methanol, the dosage is large, and it needs to be more than 10% to be effective. It is difficult to ensure that the chloride ion content in the electrolyte reaches a relatively high level. Low level, so there is a hidden danger of corrosion, so it is difficult to expect to make products with high reliability and long life

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