A method for removing binder in solid electrolytic capacitor anode block

Abstract

The invention belongs to the technical field of manufacturing of electrolytic capacitors, and particularly discloses a method for removing an adhesive in an anode block of a solid electrolytic capacitor. Treatment is carried out through the following 11 steps of dissolving, spaying, drying, compression, reciprocating sifting, first elution, standing, second elution, third elution, boiling and drying in all, so that the adhesive and a solvent can be removed clean without a residue, improvement of electric performance parameters of the capacitor is facilitated, meanwhile, fine powder particles blocked in micropores and powder particles adhered to the surface of an anode blank are also burst through, the capacity extraction rate of the capacitor is improved, and the probability of crystallization when an anode is formed is reduced. According to the method, increase of the content of impurities of carbon and oxygen in the tantalum blank is effectively suppressed, the porosity in the tantalum blank is improved and the stability and the reliability of the tantalum electrolytic capacitor are improved.

Description

technical field [0001] The invention belongs to the technical field of electrolytic capacitor manufacturing, in particular to a method for removing adhesives in anode blocks of solid electrolytic capacitors. Background technique [0002] With the acceleration of digitization, miniaturization and light weight of electronic equipment, capacitors are required to be smaller in size and larger in capacity. Therefore, the specific surface area of ​​tantalum powder for making capacitors is also increasing, the particles of tantalum powder are getting finer and smaller, and the pores between particles are getting smaller and smaller; therefore, coating the cathode electrolyte on the surface of the dielectric has become a difficulty in the prior art; In order to overcome this difficulty, many manufacturers increase the porosity in the anode block by changing the binder; however, it is very difficult to completely remove the binder; many manufacturers use high-temperature baking, but ...

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Problems solved by technology

Therefore, the specific surface area of ​​tantalum powder for making capacitors is also increasing, the particles of tantalum powder are getting finer and smaller, and the pores between particles are getting smaller and smaller; therefore, coating the cathode electrolyte on the surface of the dielectric has become a difficulty in the prior art; In order to overcome this difficulty, many manufacturers increase the porosity in the anode block by changing the binder; however, it is very difficult to completely remove the binder; many manufacturers use high-temperature baking, but due to powder compaction The formed anode body is a porous body with very small pores, and it is difficult to remove it by baking; the present invention proposes a method of dissolution to remove the binder, which can cleanly remove the binder and solvent without leaving residues, It is also beneficial to flush out the fine powder particles clogged in the micropores, and improve the capacity lead-out rate of the capacitor

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