MnO2 coating liquid of tantalum capacitor and preparation method of MnO2 coating liquid

Abstract

The invention discloses a MnO2 coating liquid of a tantalum capacitor and a preparation method of the MnO2 coating liquid. The preparation method comprises the steps of preparing 50-56wt% of manganese nitrate aqueous solution; adding 0.01-0.2wt% of non-ionic surfactant into the manganese nitrate aqueous solution, and uniformly stirring the non-ionic surfactant until the non-ionic surfactant is dissolved; adding 0.01-0.1wt% of water-soluble viscosity reducer into the manganese nitrate solution, and uniformly stirring the water-soluble viscosity reducer until the water-soluble viscosity reducer is dissolved; and continuously adding 1-2.5wt% of water-soluble alcohol into the manganese nitrate solution, and uniformly stirring the water-soluble alcohol until the water-soluble alcohol is dissolved. In the MnO2 coating liquid of the tantalum capacitor, prepared by the method, the surface tension can be reduced to 1.2*10<-2>-1.5*10<-2>N / m (25 DEG C), the viscosity can be reduced to (0.6-1.2)cp (25 DEG C), the micropore immersion capability is greatly improved, the manganese nitrate solution can be coated on a MnO2 negative electrode with enough area only by impregnation / thermal decomposition for one time, so that the capacity leading-out ratio reaches over 90%, the electrical performance of the tantalum capacitor is ensured, meanwhile, the production process can be remarkably simplified, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of manufacturing solid tantalum capacitors, and in particular relates to a coating liquid required for coating manganese dioxide cathodes in the production process of tantalum capacitors and a preparation method thereof. Background technique [0002] In recent years, all kinds of military and civilian electronic products are developing in the direction of thinness, lightness and miniaturization, which requires the miniaturization of components used in products. The remarkable advantages of solid tantalum capacitors are large capacity and easy to make small and chip components. In addition, they also have the characteristics of low leakage current, low loss, long life, and good stability, so they are widely used in various electronic products , especially in the national defense fields such as aviation, aerospace, missiles, satellites, and radars. [0003] In the production process of solid tantalum capacito...

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Problems solved by technology

Xiong Xiaoli and others mentioned in "The Effect of Ethanol on the Thermal Decomposition of Manganese Nitrate" that adding an appropriate amount of ethanol to the manganese nitrate solution can reduce the surface tension of the solution, but the surface tension of the solution is only reduced to 6.0× when the amount of ethanol added at room temperature is 4%. 10- 2 N / m, and the addition of ethanol will increase the viscosity of the solution, the increase in wetting ability is not significant, and the number of dipping times is not obvious. In addition, if the amount of ethanol is too much, it will be volatile, and the stability of the coating liquid components cannot be maintained in the production process of tantalum capacitors.

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