Working electrolyte of lead aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention relates to a working electrolyte of a lead aluminum electrolytic capacitor. The working electrolyte is composed of the following raw materials in percentage, by mass of 30-50% of solventI, 10-20% of solvent II, 6-9% of solute I, 2-4% of solute II, 1-3% of antifouling agent, 5-20% of additive and 8-20% of pressure-resistant improver. The preparation method comprises the following steps of adding the solvent I and the solvent II into a reaction kettle, heating while stirring, adding the additive when the temperature rises to 120 DEG C, and continuously heating to 140 DEG C, addingthe solute I and the solute II, keeping the temperature of 140 DEG C for 45 minutes, cooling the kettle to 130 DEG C, adding the pressure-resistant improver, stirring and keeping the temperature for30 minutes, and finally, cooling the kettle to 110 DEG C, adding the antifouling agent, fully stirring, and naturally cooling to room temperature after 45 minutes to obtain the finished product electrolyte. The method is advantaged in that the enough voltage endurance capability can be guaranteed under the condition of high conductivity, the aluminum foil is prevented from hydration reaction, andthe service life of the product is prolonged.

Description

technical field [0001] The invention belongs to the field of capacitor preparation, in particular to a 550V-600V ultra-high voltage long-life lead aluminum electrolytic capacitor working electrolyte and a preparation method thereof. Background technique [0002] At present, the basic functions of aluminum electrolytic capacitors in electronic circuits are generally summarized as: passing through AC, blocking DC, having the functions of filtering, bypassing, coupling and fast charging and discharging, and having the characteristics of small size, large storage power, and high cost performance. [0003] Aluminum electrolytic capacitors can be divided into liquid aluminum electrolytic capacitors and solid aluminum electrolytic capacitors according to the different electrolyte forms; according to the different lead-out methods, they can be divided into five types: lead type, solder pin type, solder tab type, bolt type, and chip type. [0004] According to different application f...

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Problems solved by technology

[0005] Under normal circumstances, there are several kinds of civil voltages in the world: 100V, 110V~130V, and 220V~240V. Under normal circumstances, if the power supply line is stable, 200V or 250V electrolysis is enough for 100V~130V line input filter, and 220V~240V The power line of 350V or 400V can be satisfied, but in some countries and regions, due to insufficient power supply, the voltage fluctuation range is particularly large, and the maximum fluctuation of the 220V power supply line even reaches 380V or above. At this time, the electrolysis below 500V cannot work normally. When it is effective, it is necessary to use 550V or even 600V electrolysis to ensure the normal operation of equipment and lighting and to achieve the designed service life

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