Electrolyte of medium-high voltage aluminum electrolytic capacitor and preparation method of solute thereof

A technology for aluminum electrolytic capacitors and electrolytes, which is applied in the field of preparation of electrolytes and their solutes, can solve the problems of affecting the performance and life of capacitors, affecting the life of capacitors, and poor low-temperature performance, achieving good low-temperature performance, high flashover voltage, The effect of good thermal stability

Active Publication Date: 2009-11-04
HUIZHOU CAPCHEM CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The known electrolytic solution of medium and high voltage electrolytic capacitors for aluminum electrolytic capacitors uses ethylene glycol as a solvent, and inorganic compounds such as boric acid or ammonium pentaborate as the main solute, and then uses azelaic acid, sebacic acid, and dodecanedioic acid as the main solute. And its ammonium salt as the main solute of the electrolyte, and the above inorganic salts and organic acid salts are also used as the solute. Such a

Method used

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  • Electrolyte of medium-high voltage aluminum electrolytic capacitor and preparation method of solute thereof
  • Electrolyte of medium-high voltage aluminum electrolytic capacitor and preparation method of solute thereof
  • Electrolyte of medium-high voltage aluminum electrolytic capacitor and preparation method of solute thereof

Examples

Experimental program
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Example Embodiment

[0062] Example 1:

[0063] 210g of dimethyl hexylmalonate (ie 0.97mol), 100g of methyl methacrylate (ie 1mol), 5g of sodium methoxide (ie 0.093mol), mix and stir, react at 90°C for 14 hours, neutralize to neutral After saponification, acidification, decarboxylation, and cleaning, 150g of 2-methyl-4-hexylglutaric acid was obtained by distillation under reduced pressure, with a yield of 67% (calculated as dimethyl hexylmalonate);

Example Embodiment

[0064] Example 2:

[0065] 435g (ie 2.3mol) of dimethyl butylmalonate, 250g (ie 2.5mol) of methyl methacrylate, 13.5g (ie 0.25mol) of sodium methoxide, mix and stir, and react at 85°C for 10 hours. After neutralization, distillation under reduced pressure, saponification, acidification, decarboxylation, and washing to obtain 360g of 2-methyl-4-butylglutaric acid, with a yield of 77% (calculated as dimethyl butylmalonate) ;

Example Embodiment

[0066] Example 3:

[0067] Make 2-methyl-4-hexylglutaric acid and ammonia into a normal ammonium salt, prepare a 5% ethylene glycol solution as an electrolyte, add 0.1% ammonium hypophosphite and 0.4% p-nitrobenzyl alcohol, and seal Constant temperature at 105℃ in stainless steel bottle;

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Abstract

The invention relates to electrolyte of a medium-high voltage aluminum electrolytic capacitor and a preparation method of solute thereof. In order to solve the problems of low sparking voltage, poor thermal stability and bad solubility in the traditional electrolyte, the invention provides the electrolyte containing dicarboxylic acid having a branched chain or salt thereof as a solute and a single solvent or a mixed solvent containing more than one selected from alcohols, alcohols and ethers, amides, sulfones, sulfoxides and esters, wherein the mass percentage of the solute is 0.5-30 percent. The dicarboxylic acid having a branched chain is prepared by evenly mixing and reacting a reactant (formula is shown upper right) (A, B are electron withdrawing groups, and R1 is a branched chain) and acrylic acid derivative and catalyzer alkali, saponifying, acidizing by strong acid, decarboxylating and washing by purified water. Ammonium salt is produced if required by dicarboxylic acid containing ether group reacting with ammonia or amine. The electrolyte prepared with acid or salt thereof in the invention has better solubility and thermal stability.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte solution of an electrolytic capacitor and a solute thereof, in particular to a method for preparing an electrolyte solution and a solute thereof of a medium-high voltage aluminum electrolytic capacitor. Background technique [0002] The known electrolytic solution of medium and high voltage electrolytic capacitors for aluminum electrolytic capacitors uses ethylene glycol as a solvent, and inorganic compounds such as boric acid or ammonium pentaborate as the main solute, and then uses azelaic acid, sebacic acid, and dodecanedioic acid as the main solute. And its ammonium salt as the main solute of the electrolyte, and the above inorganic salts and organic acid salts are also used as the solute. Such an electrolyte has poor stability at a high temperature of 105 degrees Celsius or above. The rate drops rapidly, which affects the performance and life of the capacitor. Among them, boric acid o...

Claims

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Application Information

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IPC IPC(8): H01G9/022H01G9/035
Inventor 郑仲天何天虔陈长春
Owner HUIZHOU CAPCHEM CHEM CO LTD
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