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Process method for improving water resistance of formed foil

A process method, the technology of forming foil, which is applied in the electronic field, can solve the problems of aluminum foil withstand voltage drop, leakage current increase, shell bursting, etc., and achieve the effects of good water resistance, improved service life, and reduced production costs

Active Publication Date: 2019-04-23
YANGZHOU HONGYUAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the moisture content in the capacitor is high, and the oxide film on the surface of the aluminum foil will hydrate with water to produce aluminum hydroxide, resulting in a decrease in the withstand voltage of the aluminum foil and an increase in the leakage current, and even hydrogen gas will be generated in the capacitor, causing the internal pressure to rise. The shell is bulging or even bursting, which affects the electrical performance, working life, and safety issues of capacitors and electrical systems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to the process of the present invention, the formation foil with the highest voltage of 23V is as follows:

[0023] 1. Soak the electrified formed foil in a phosphoric acid aqueous solution with a conductivity of 15us / cm and a temperature of 40°C for 3 minutes, and then wash it with ionized water.

[0024] 2. Perform high-temperature heat treatment on the cleaned formed foil, the temperature is 470°C, and the heating time is 50 seconds.

[0025] 3. Soak the dried aluminum foil in a mixture of 5.2% ammonium adipate and 2.8% ammonium dihydrogen phosphate at a temperature of 75°C for 3 minutes, and then wash it with deionized water.

[0026] 4. Soak the cleaned formed foil in 0.6% sodium polyacrylate at a temperature of 75°C for 60 seconds.

[0027] 5. Heat the formed foil at room temperature at 200°C for 60 seconds.

Embodiment 2

[0035] According to the process of the present invention, the formation foil with the highest voltage of 50V is made as follows:

[0036] 1. Soak the electrified formed foil in phosphoric acid aqueous solution with a conductivity of 25us / cm and a temperature of 50°C for 4 minutes, and then wash it with ionized water.

[0037] 2. Perform high-temperature heat treatment on the cleaned formed foil at a temperature of 500° C. for 70 seconds.

[0038] 3. Soak the dried aluminum foil in a mixture of 5.8% ammonium adipate and 2.4% ammonium dihydrogen phosphate at a temperature of 78°C for 5 minutes, and then wash it with deionized water.

[0039] 4. Soak the cleaned formed foil in 0.8% sodium polyacrylate at a temperature of 60°C for 80 seconds.

[0040] 5. Heat the formed foil at room temperature at 220°C for 40 seconds.

Embodiment 3

[0048] According to the process of the present invention, the formation foil with the highest voltage of 67V is made as follows:

[0049] 1. Soak the electrified formed foil in an aqueous phosphoric acid solution with a conductivity of 30us / cm and a temperature of 35°C for 3 minutes, and then wash it with ionized water.

[0050] 2. Perform high-temperature heat treatment on the cleaned formed foil at a temperature of 450° C. for 80 seconds.

[0051] 3. Soak the dried aluminum foil in a mixture of 5.4% ammonium adipate and 3.6% ammonium dihydrogen phosphate at a temperature of 70°C for 4 minutes, and then wash it with deionized water.

[0052] 4. Soak the cleaned formed foil in 1% sodium polyacrylate at a temperature of 65°C for 70 seconds

[0053] 5. Heat the formed foil at room temperature at 240°C for 50 seconds.

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Abstract

The invention discloses a process method for improving the water resistance of a formed foil, which comprises the following steps of: 1, soaking the formed foil into a phosphoric acid aqueous solution, and then washing with ionized water; 2, performing high-temperature heat treatment on the formed foil washed in the step 1; 3, soaking the formed foil subjected to high-temperature heat treatment inthe step 2 into a mixed solution of ammonium adipate and ammonium dihydrogen phosphate, and cleaning the formed foil with ionized water; 4, soaking the formed foil washed in the step 4 into sodium polyacrylate, and then washing the formed foil with ionized water; 5, subjecting the formed foil washed in the step 5 to normal-temperature heat treatment; 6, after cooling the formed foil subjected toheat treatment in the step 5, taking out the treated formed foil. According to the process method, the electrostatic capacity of the aluminum foil is not changed, and the water resistance is better than that of the original process. As a result, the service life of a capacitor in the electrolyte is prolonged. The production cost is reduced, and the market demand is further met.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to a process method for improving the water resistance of formed foil. Background technique [0002] At present, the global aluminum electrolytic capacitor supply market is becoming more and more mature, mainly concentrated in Japan, China, South Korea and other regions. The basic functions of aluminum electrolytic capacitors in electronic circuits are generally to pass AC, block DC, have filtering, bypass, coupling and fast charge and discharge functions, and have the characteristics of small size, large storage capacity, and high cost performance. With the advancement of modern technology and the continuous improvement of capacitor performance, aluminum electrolytic capacitors have been widely used in consumer electronics products, communication products, computers and peripheral products, new energy, automation control, automotive industry, optoelectronic products, high-speed...

Claims

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Application Information

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IPC IPC(8): H01G9/045H01G9/00C25D11/24
CPCC25D11/24H01G9/0029H01G9/045
Inventor 马坤松相志明王磊周鑫
Owner YANGZHOU HONGYUAN ELECTRONICS
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