Electrolyte for aluminium electrolytic capacitor and preparation method of core solute thereof

An aluminum electrolytic capacitor and electrolyte technology, which is applied in electrolytic capacitors, capacitors, carboxylate/lactone preparation, etc., can solve the problems of low conductivity, large decrease in conductivity, and increase in capacitor impedance value, so as to achieve the life of the capacitor. Long, good thermal stability, good low temperature performance

Active Publication Date: 2009-09-02
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such an electrolyte has the problem of low conductivity. Later, straight-chain diacids such as azelaic acid, sebacic acid, and dodecanedioic acid or their ammonium salts were used as the main solute of the electrolyte, and the above inorganic salts were also used. The above organic acids are used as solutes, and such electrolytes have poor thermal stability at high temperatures.
After a long-term high temperature, its conductivity drops greatly, which l

Method used

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  • Electrolyte for aluminium electrolytic capacitor and preparation method of core solute thereof
  • Electrolyte for aluminium electrolytic capacitor and preparation method of core solute thereof
  • Electrolyte for aluminium electrolytic capacitor and preparation method of core solute thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Take 70g (0.4mol) of dimethyl adipate and put it into a 500ml three-necked flask, add 210g of diethylene glycol dimethyl ether, add 23g (0.43mol) of sodium methoxide under stirring, heat to 50°C and react under reduced pressure for 3 hours , after the reaction was complete, the solvent was distilled off. H 2 SO 4Neutralize to neutral, separate the oil layer, and the oil layer is subjected to vacuum distillation to separate 40g of the intermediate product B, put the intermediate product into a 500ml there-necked flask, add 15.2g of sodium methylate, add 140g of tert-butanol, under reflux (80 -85°C) was added dropwise into 49g of bromohexane, reacted for 24h, after the reaction was completed, distilled off tert-butanol, and used H 2 SO 4 Neutralize to neutral, separate the oil layer, distill under reduced pressure, carry out acid decomposition under heating with concentrated NaOH solution, H 2 SO 4 After neutralization, it was washed and dried to obtain 47 g of 2-hex...

Embodiment 2

[0051] Take 70g (0.4mol) of dimethyl adipate and put it into a 500ml three-necked flask, add 210g of diethylene glycol dimethyl ether, add 23g (0.43mol) of sodium methoxide under stirring, heat to 50°C and react under reduced pressure for 3h, After the reaction was completed, the solvent was distilled off, and the residue was washed with H 2 SO 4 Neutralize to neutral, separate the oil layer, and the oil layer is subjected to vacuum distillation to separate 41g of the intermediate product B, put the intermediate product into a 500ml three-necked flask, add 15.6g of sodium formate, add 140g of tert-butanol, under reflux (80~ 85°C) into 42g of bromobutane dropwise, and reacted for 24 hours. After the reaction was completed, tert-butanol was evaporated, and H 2 SO 4 Neutralized to neutral, separate oil layer. Vacuum distillation. Acid decomposition under heating with concentrated NaOH solution, H 2 SO 4 After neutralization, it was washed and dried to obtain 37 g of 2-butyl...

Embodiment 3

[0056] The acid obtained in Example 1 is made into ammonium salt and made into 250 g of 5% ethylene glycol solution, then 0.1% ammonium hypophosphite and 0.4% p-nitrobenzyl alcohol are added to make electrolyte, packed into a 500ml stainless steel bottle, sealed , Constant temperature at 105 ℃ and then test the parameters.

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Abstract

The invention relates to an electrolyte for an aluminium electrolytic capacitor and a preparation method of a core solute thereof, in particular to an electrolyte for a medium-high voltage aluminium electrolytic capacitor, which has high heat stability. The electrolyte for the medium-high voltage aluminium electrolytic capacitor comprises a solute and a solvent and is characterized in that the solute comprises alpha position dicarboxylic acid which contains branched chains or binary carboxylic salt, the solvent is one of an alcohol solvent, an alcohol ether solvent, an acid amide solvent, a sulphone solvent, a sulphoxide solvent and an ester solvent or is a mixed solvent formed by more than one of the alcohol solvent, the alcohol ether solvent, the acid amide solvent, the sulphone solvent, the sulphoxide solvent and the ester solvent, wherein the content of the alpha position dicarboxylic acid which contains the branched chains or the binary carboxylic salt is 0.1-30 percent by weight, and the preferable content is 2.5-15 percent by weight. Besides, the invention also provides a preparation method of the alpha position dicarboxylic acid which contains the branched chains and dicarboxylic acid ammonium salt. Due to the alpha position dicarboxylic acid which contains the branched chains and the binary carboxylic salt, the electrolyte inside glycol has better solubility and heat stability, and the obtained capacitor has long service life and good low-temperature property.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte solution and a core solute of an aluminum electrolytic capacitor, in particular to a method for preparing an electrolyte solution and a core solute of a medium- and high-voltage aluminum electrolytic capacitor. Background technique [0002] The known electrolytic solutions of medium and high voltage aluminum electrolytic capacitors use ethylene glycol as the main solvent and inorganic compounds such as boric acid or ammonium pentaborate as the main solute. This kind of electrolyte has the problem of low conductivity. Later, azelaic acid, sebacic acid, dodecanedioic acid and other straight-chain diacids or their ammonium salts were used as the main solute of the electrolyte, and the above inorganic salts were also used. The above organic acids are used as solutes, and such electrolytes have the problem of poor thermal stability at high temperatures. After a long-term high temperature, its c...

Claims

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Application Information

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IPC IPC(8): H01G9/035C07C55/02C07C51/09
Inventor 郑仲天何天虔陈长春向秋芬
Owner SHENZHEN CAPCHEM TECH
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