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Preparation process of polyimide-aluminum composite foil

A polyimide, preparation technology, applied in the field of electrode foil manufacturing, can solve the problems of reduced structural strength, increased production cost, placed in a vacuum environment or an inert gas environment, etc., to achieve high dielectric constant and capacitance, Effect of improving bending strength and good surface quality

Active Publication Date: 2022-07-08
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared electrode foil has a large number of corrosion channels remaining in it, resulting in a decrease in its structural strength, which is specifically reflected in the fact that the number of bends under the rated load cannot meet the quality inspection standards, and the total preparation cycle is longer, that is, indirectly Increased manufacturing costs
In addition, after the corroded foil is prepared, it must be placed in a vacuum environment or an inert gas environment in order to avoid oxidation on its surface, which will lead to a sharp increase in the cost of heat treatment.

Method used

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  • Preparation process of polyimide-aluminum composite foil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation process of polyimide-aluminum composite foil includes the following steps:

[0038] S1. Heat treatment stage: place aluminum foil with a purity of not less than 99.9% in an oven for heat treatment, the temperature is controlled at 480-520 °C, and the duration is controlled at 3-5min;

[0039] S2, cooling stage: the aluminum foil processed in step S1 is placed in the air to cool naturally;

[0040] S3, corrosion foil preparation stage; the aluminum foil treated in step S2 is immersed in a corrosion acid solution to form corrosion pores on its surface; the corrosion acid solution used is hydrochloric acid 11.03mol / L: sulfuric acid 7.5mol / L=2:1 Mix the solution, and the temperature is controlled at 50 ~ 70 ℃;

[0041] S4, the preparation stage of the reaming foil; the etched foil obtained in step S3 is placed in the reaming liquid to ream the corroded pores, and the pore diameter of the etched porosity after the treatment is not less than 0.1 μm; the reami...

Embodiment 2

[0055] The preparation process of polyimide-aluminum composite foil includes the following steps:

[0056] S1. Heat treatment stage: place aluminum foil with a purity of not less than 99.9% in an oven for heat treatment, the temperature is controlled at 480-520 °C, and the duration is controlled at 3-5min;

[0057] S2, cooling stage: the aluminum foil processed in step S1 is placed in the air to cool naturally;

[0058] S3, corrosion foil preparation stage; the aluminum foil treated in step S2 is immersed in a corrosion acid solution to form corrosion pores on its surface; the corrosion acid solution used is hydrochloric acid 11.03mol / L: sulfuric acid 7.5mol / L=2:1 Mix the solution, and the temperature is controlled at 50 ~ 70 ℃;

[0059] S4, the preparation stage of the reaming foil; the etched foil obtained in step S3 is placed in the reaming liquid to ream the corroded pores, and the pore diameter of the etched porosity after the treatment is not less than 0.1 μm; the reami...

Embodiment 3

[0069] The preparation process of polyimide-aluminum composite foil includes the following steps:

[0070] S1. Heat treatment stage: place aluminum foil with a purity of not less than 99.9% in an oven for heat treatment, the temperature is controlled at 480-520 °C, and the duration is controlled at 3-5min;

[0071] S2, cooling stage: the aluminum foil processed in step S1 is placed in the air to cool naturally;

[0072] S3, corrosion foil preparation stage; the aluminum foil treated in step S2 is immersed in a corrosion acid solution to form corrosion pores on its surface; the corrosion acid solution used is hydrochloric acid 11.03mol / L: sulfuric acid 7.5mol / L=2:1 Mix the solution, and the temperature is controlled at 50 ~ 70 ℃;

[0073] S4, the preparation stage of the reaming foil; the etched foil obtained in step S3 is placed in the reaming liquid to ream the corroded pores, and the pore diameter of the etched porosity after the treatment is not less than 0.1 μm; the reami...

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Abstract

The invention relates to a polyimide-aluminum composite foil preparation process which comprises the following steps: an aluminum foil heat treatment stage, an aluminum foil cooling stage, a corrosion foil preparation stage, a chambering foil preparation stage, a polyimide composite layer preparation stage, a surface cleaning stage and a drying treatment stage. In the preparation stage of the polyimide composite layer, a pre-treatment solution is formed by mixing 4, 4 '-diaminodiphenyl ether, N, N-dimethylacetamide and ammonium tetra-n-hexyl benzoate, and a post-treatment solution is formed by mixing sulfuric acid, hydrochloric acid, 4, 4'-diaminodiphenyl ether, N, N-dimethylacetamide and ammonium tetra-n-hexyl benzoate. Therefore, the formed polyimide composite layer can be stably attached to the outer surface of the corrosion foil, so that the bending strength of the electrode foil can be improved; and the polyimide composite layer filled in the corrosion hole channel can be tightly combined with the aluminum residual core into a whole, so that the formed electrode foil is ensured to have relatively high dielectric constant and capacitance.

Description

technical field [0001] The invention relates to the technical field of electrode foil manufacturing, in particular to a preparation process of a polyimide-aluminum composite foil. Background technique [0002] With the promotion of the national power cut and power saving policy, it is imperative to save electricity in industrial production. Due to its low power consumption characteristics, the chemical machine production process mainly based on chemical corrosion has been continuously developed in the industry. For example, Chinese patent CN113502476B discloses a method for manufacturing an electrode foil for solid aluminum electrolytic capacitors, which includes the following steps: immersing the aluminum foil in a hydrochloric acid solution; immersing it in an acid solution again, and applying a high-frequency pulse current for pre-electrolysis; Perform the first electrolytic corrosion and the second electrolytic corrosion; repeat the first and second electrolytic corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055H01G9/042H01G9/045
CPCH01G9/055H01G9/042H01G9/045Y02E60/10
Inventor 王建中朱伟晨濮钰程恒洋何桂丽闫康平王贵欣
Owner NANTONG HAIXING ELECTRONICS
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