Flame-retardant electrolytic solution for aluminum electrolytic capacitor

A technology for aluminum electrolytic capacitors and electrolytes, applied in electrolytic capacitors, liquid electrolytic capacitors, capacitors, etc., can solve problems affecting safety, high conductance and flashover voltage, complex imidazole/imidazoline salt preparation process, etc., to achieve good Effect of flame retardant effect, high electrical conductivity and flashover voltage

Inactive Publication Date: 2017-02-22
JIANGSU GUOTAI SUPER POWER NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing patent (Japanese Patent Laid-Open No. 2003-142346), the electrolyte is an organic system electrolyte composed of tetrafluoroaluminic acid, and its conductance and flashover voltage are both high. The problem is that the application requirements are high, and the presence of a small amount of water will cause Causes the electrolyte to react to produce hydrogen fluoride, causing corrosion and affecting safety
The problem is that the preparation process of imidazole / imidazoline salt is relatively complicated, and the flame retardancy of the electrolyte has not been studied

Method used

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  • Flame-retardant electrolytic solution for aluminum electrolytic capacitor
  • Flame-retardant electrolytic solution for aluminum electrolytic capacitor
  • Flame-retardant electrolytic solution for aluminum electrolytic capacitor

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1: Electrolyte 1: Preparation of 1-ethyl-3-methylimidazolium diethyl phosphate

[0027] Add 1-ethylimidazole dropwise to the methanol solution of dimethyl carbonate, and stir at 120°C for 36 hours to obtain a methanol solution of 1-ethyl-3-methylimidazole dimethyl carbonate

[0028] Diethyl phosphate (provided by Chengbei Chemical) was added to the methanol solution of 1-ethyl-3-methylimidazole dimethyl carbonate for salt exchange reaction. The reaction produces a large number of bubbles, which are CO2, and a methanol solution of 1-ethyl-3-methylimidazolium diethylphosphate anion is obtained. Distill the methanol and CO2 in the system from the above solution under normal pressure, and then under negative pressure conditions (the degree of reduced pressure below 5KPa, 80°C), the residual methanol in the system and the incompletely reacted 1-ethylimidazole, dicarbonate Raw materials such as methyl esters are removed. Electrolyte 1 thus obtained: 1-Ethyl-3-met...

Embodiment 2

[0029] Embodiment 2: Electrolyte 2: Preparation of 1-ethyl-3-methylimidazolium dibutyl phosphate

[0030] In the methanol solution of dimethyl carbonate, 1-ethylimidazole was added dropwise, and stirred at 120° C. for 36 h to obtain a methanol solution of 1-ethyl-3-methylimidazole dimethyl carbonate.

[0031] Dibutyl phosphate (provided by Chengbei Chemical) was added to the methanol solution of 1-ethyl-3-methylimidazole dimethyl carbonate for salt exchange reaction. The reaction produces a large number of bubbles, which are CO2, and a methanol solution of 1-ethyl-3-methylimidazolium dibutyl phosphate anion is obtained. Distill the methanol and CO2 in the system from the above solution under normal pressure, and then under negative pressure conditions (the degree of reduced pressure below 5KPa, 80°C), the residual methanol in the system and the incompletely reacted 1-ethylimidazole, dicarbonate Raw materials such as methyl esters are removed. Electrolyte 2 thus obtained: 1-E...

Embodiment 3

[0032] Embodiment 3: Electrolyte 3: Preparation of dimethylethylamine hydrogen phthalate

[0033] Water was added to phthalic anhydride, stirred and hydrolyzed at 100°C for 4 hours to obtain an aqueous solution of phthalic acid.

[0034] Dimethylethylamine was added to the above-mentioned aqueous solution of phthalic acid, and neutralization reaction was carried out for 1h. After the reaction is finished, the water in the system is removed under negative pressure conditions (lower than 5KPa, 80° C.), until the total water content of the reaction solution is lower than 1%. Electrolyte 3 thus obtained: Dimethylethylamine hydrogen phthalate

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Abstract

The invention provides a flame-retardant electrolytic solution for an aluminum electrolytic capacitor. The electrolytic solution comprises electrolyte salt and a solvent. The electrolyte salt comprises electrolyte salt 1 and electrolyte salt 2. The electrolyte salt 1 has a structural formula (as shown in the description) or (as shown in the description). The electrolyte salt 2 has a structural formula (as shown in the description), wherein R1, R2, R3, R4, R5, R6, R7, R8, R9 are independently selected from the alkyl group with the number of carbon atoms of 1-5. The electrolytic solution of the invention is capable of obtaining higher electrical conductivity and broken voltage, and has a good flame-retardant effect.

Description

technical field [0001] The invention relates to an electrolytic solution for a flame-retardant aluminum electrolytic capacitor. Background technique [0002] In recent years, the use voltage of LED lamps and vehicle power supplies has been increasing day by day. The aluminum electrolytic capacitor used in this type of electrical appliances is a key electronic component. It is usually used in series and parallel combinations, which requires high reliability and safety. [0003] The performance of the electrolyte has a decisive influence on many characteristics of aluminum electrolytic capacitors. As the electrolyte for LED lamps and vehicle power supply capacitors, the electrolyte is required to have high conductivity, high flash voltage, and good flame retardancy. [0004] Existing patent (Japanese Patent Laid-Open No. 2003-142346), the electrolyte is an organic system electrolyte composed of tetrafluoroaluminic acid, and its conductance and flashover voltage are both high....

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 施苏萍任齐都卢建龙余三宝李建中
Owner JIANGSU GUOTAI SUPER POWER NEW MATERIALS
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