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Working electrolyte for high voltage aluminum electrolytic capacitor, preparation method thereof and application

A technology of aluminum electrolytic capacitors and electrolytes, applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve problems such as difficult to meet the use of capacitors and large decrease in conductivity, and achieve widened use temperature range, excellent low temperature performance, and improved Effect of Ripple Current Capability

Inactive Publication Date: 2018-05-01
DONGGUAN HEC CONDENSER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the freezing point of ethylene glycol is -12.9°C, it is difficult to meet the use of capacitors in low temperature environments, so it is necessary to add additional co-solvents to form a mixed solvent with better comprehensive properties
Diethylene glycol monobutyl ether has a boiling point of 231°C and a freezing point of -68.1°C. Its mixed use with ethylene glycol can better solve the low temperature performance, but the conductivity of diethylene glycol monobutyl ether to the working electrolyte is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A working electrolyte for a high-voltage aluminum electrolytic capacitor, which contains the following components in parts by weight:

[0038]75 parts of ethylene glycol; 10 parts of 3-methoxypropionitrile; 1 part of polyvinyl alcohol; 4 parts of ammonium azelate; 3 parts of ammonium sebacate; 5 parts of ammonium dodecanoate; 0.2 parts of ammonium hypophosphite And 1.8 parts of p-nitrobenzoic acid.

[0039] The performance parameters of the working electrolyte prepared by the above components are:

[0040] The conductivity σ is 2.05±0.05ms / cm, the flash voltage Usp≥485V, the pH is 6.0±0.5, the viscosity η is 70±5mPa·S, and the saturated vapor pressure Ps (105°C) is 16±0.5Kpa. The parameters are all in Measured at 30°C; clear liquid at -25°C, no precipitation at -40°C.

Embodiment 2

[0042] A working electrolyte for a high-voltage aluminum electrolytic capacitor, which contains the following components in parts by weight:

[0043] 80 parts of ethylene glycol; 5 parts of 3-methoxypropionitrile; 1 part of polyvinyl alcohol; 4 parts of ammonium azelate; 3 parts of ammonium sebacate; 5 parts of ammonium dodecanoate; 0.2 parts of ammonium hypophosphite And 1.8 parts of p-nitrobenzoic acid.

[0044] The performance parameters of the working electrolyte prepared by the above components are:

[0045] The conductivity σ is 1.92±0.05ms / cm, the flash voltage Usp≥485V, the pH is 6.0±0.5, the viscosity η is 70±5mPa·S, and the saturated vapor pressure Ps (105°C) is 16±0.5Kpa. The parameters are all in Measured at 30°C; clear liquid at -25°C, no precipitation at -40°C.

Embodiment 3

[0047] A working electrolyte for a high-voltage aluminum electrolytic capacitor, which contains the following components in parts by weight:

[0048] 75 parts of ethylene glycol; 5 parts of n-butanol; 5 parts of 3-methoxypropionitrile; 1 part of polyvinyl alcohol; 4 parts of ammonium azelate; 3 parts of ammonium sebacate; 5 parts of ammonium dodecanoate; 0.2 parts of ammonium hypophosphite and 1.8 parts of p-nitrobenzoic acid.

[0049] The performance parameters of the working electrolyte prepared by the above components are:

[0050] The conductivity σ is 2.00±0.05ms / cm, the flash voltage Usp≥483V, the pH is 6.0±0.5, the viscosity η is 70±5mPa·S, and the saturated vapor pressure Ps (105°C) is 16±0.5Kpa. The parameters are all in Measured at 30°C; clear liquid at -25°C, no precipitation at -40°C.

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Abstract

The invention relates to a working electrolyte for a high voltage aluminum electrolytic capacitor, a preparation method thereof and application. The solvent in the working electrolyte is composed of amain solvent and an auxiliary solvent, the main solvent at least contains an alcoholic solvent, and the auxiliary solvent is 3-methoxypropionitrile. Through adopting the 3-methoxypropionitrile as theauxiliary solvent and combining the 3-methoxypropionitrile with the alcoholic main solvent, in particular, ethylene glycol for use, the conductivity of the working electrolyte is greatly increased, high sparking voltage can be kept and can reach more than 480 V, and besides, with the excellent low temperature properties, the use temperature range of products can be broadened, and low ESR and losscan improve the ripple current resistance ability of products.

Description

technical field [0001] The invention relates to the technical field of electrolytic capacitors, in particular to a working electrolyte of a high-voltage aluminum electrolytic capacitor and a preparation method and application thereof. Background technique [0002] As an important basic component of electrical equipment, aluminum electrolytic capacitors are widely used in televisions, industrial inverters, inverter air conditioners, UPS power supplies, LED energy-saving lamps, medical equipment and other industries. The structure of an aluminum electrolytic capacitor mainly includes a core package, an aluminum shell, a skin head (cover plate) and a working electrolyte, and the working electrolyte is called the "blood" of the capacitor. It serves as the actual cathode of the capacitor and also repairs the oxidation of the anode foil. film and function to provide a conductive environment. Therefore, the quality of the working electrolyte plays a vital role in the performance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/145
CPCH01G9/00H01G9/145
Inventor 李刚罗爱文韦於正
Owner DONGGUAN HEC CONDENSER CO LTD
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