Fire retarding electrolytic solution and preparation thereof

Abstract

The invention relates to a flame retardant electrolyte and the preparation method thereof. The electrolyte comprises glycol, polyvinyl alcohol, boric acid, ammonium tetraborate and mannitol, and the weight percentages of the components are respectively 56 to 75 percent : 0.5 to 2.5 percent : 6 to 10 percent : 10 to 15 percent : 8 to 15 percent; and besides, 0.5 to 1.5 percent of O- nitroanisole is added. The electrolyte is not only resistant to high temperature and high pressure, but also reduces the amount of hydrogen; and a manufactured aluminum electrolytic capacitor has the service life of 2000 hours at a temperature of 95 DEG C, is resistant to high pressure up to 450 V, can reduce the vapor pressure of the electrolyte, and has the advantage of flame retardancy.

Description

technical field [0001] The invention belongs to the field of electrolyte and its preparation, in particular to a flame-retardant electrolyte and a preparation method thereof. Background technique [0002] The electrolyte is the cathode of the aluminum electrolytic capacitor, and its performance has a certain influence on the performance of the aluminum electrolytic capacitor. The existing electrolyte formula is mainly composed of solute and solvent. Chinese patent 99121506.0 (aluminum electrolytic capacitor) invented a non-flash point aluminum electrolytic capacitor with little appearance change and characteristic deterioration even if it is used at high temperature for a long time, and has high reliability. The water content of its electrolyte is 20~90 重量 %, the electrolyte contains ammonium formate, ammonium acetate, ammonium lactate, ammonium glycolate, ammonium oxalate, ammonium succinate, ammonium malonate, ammonium adipate, ammonium benzoate, ammonium glutarate, azela...

AI Technical Summary

Problems solved by technology

Chinese patent 99121506.0 (aluminum electrolytic capacitor) invented a non-flash point aluminum electrolytic capacitor with little appearance change and characteristic deterioration even if it is used at high temperature for a long time, and has high reliability. The water content of its electrolyte is 20~90 重量 %, the electrolyte contains ammonium formate, ammonium acetate, ammonium lactate, ammonium glycolate, ammonium oxalate, ammonium succinate, ammonium malonate, ammonium adipate, ammonium benzoate, ammonium glutarate, azelaic acid More than one compound in ammonium is used as the main electrolyte, and additionally contains 1 重量 More than one compound selected from organic carboxylic acids with specific structures or their ammonium salts, the freezing point of the above-mentioned electrolyte is below -10°C, which improves its withstand voltage and high-temperature performance, but fails to suppress the generation of hydrogen

[0003] Chinese patent 02805612.4 (electrolytic capacitor and electrolytic capacitor driving electrolyte) discloses the absorption of hydrogen generated by the reaction of aluminum electrode foil and electrolyte, and the addition of compounds containing unsaturated bonds to make electrolytic capacitors with electrical characteristics and performance under high-temperature storage conditions. Capacitors with good characteristics provide electrolytic capacitors containing unsaturated compounds that cause hydrogenation reactions inside, and are 10 to 80 with respect to containing solvents 重量 % of organic solvents and 90-20 重量 A solvent composed of water, and an electrolyte solution of at least one electrolyte selected from carboxylic acids or their salts and inorganic acids or their salts, containing one or more of them can be used in water-soluble or polar solvents and proton-based polar solvents The electrolyte is composed of dissolved unsaturated compounds. Although this formula can reduce the amount of hydrogen, it has no obvious effect on improving the performance of high temperature and high pressure resistance.