Preparation process of formed foil

Abstract

The invention relates to the technical field of formed foils, in particular to a preparation process of a formed foil. The preparation process comprises the following steps: S1, pre-treatment of an aluminum foil: first putting the aluminum foil in water at 100 DEG C to be left to stand for 1-2 hours; then sending the aluminum foil to a saline liquid to be treated for 20-30 min and the activating the aluminum foil; then repeatedly washing the aluminum foil with deionized water for 1-3 times; and then sending the aluminum foil to a drying box to be dried for 30-40 min at 60-70 DEG C for later use. By putting the aluminum foil in water at 100 DEG C to be left to stand for 1-2 hours and activating the aluminum foil, so that a formed liquid of the aluminum foil is more easily to react, and thecost is saved. Meanwhile, the formation efficiency is high. Compared with the prior art, the aluminum foil which is activated is better in water resistance and is more convenient for follow-up treatment.

Description

technical field [0001] The invention relates to the technical field of formed foil, in particular to a preparation process of formed foil. Background technique [0002] Formed foil is the product of special high-purity aluminum foil after electrochemical or chemical corrosion to expand the surface area, and then forms a layer of oxide film (aluminum oxide) on the surface through electrochemical formation. According to voltage, chemically formed aluminum foil is generally divided into There are four kinds of extremely low voltage, low voltage, medium and high voltage and high voltage, according to the thickness, ranging from 25-110 microns; according to the use, there are positive foil and negative foil, and there are also guide foils. High-voltage anode foil can be divided into two categories, one is high-quality High-voltage foil, one type is ordinary high-voltage foil, and the negative electrode foil is also divided into soft state and hard state. Japan mainly uses soft st...

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Problems solved by technology

[0003] Chinese patent literature (publication number: CN107799313A) discloses a chemical formation foil and its production process. The formation foil production process includes steps such as aluminum foil pretreatment, first to third-level formation, baking, four-level formation, curing, and drying. The chemical formation solutions obtained are all boric acid solutions, and the first to fourth grade chemical formation liquids all have a certain temperature, and their concentration gradually increases; the chemical formation is carried out in a direct current electric field, solidified in ammonium dihydrogen phosphate solution or ammonium dihydrogen phosphate and ammonium dihydrogen phosphate Phosphoric acid mixed solution; the forming foil process technology is environmentally friendly, but the water resistance is not very good, still needs further improvement

[0004] Chinese patent document (publication number: CN101425395A) discloses a manufacturing method of low-voltage, high-dielectric chemical forming foil for aluminum electrolytic capacitors, preparing sol-gel liquid, conducting direct current chemical forming treatment to form chemical forming foil, air-drying in air, heating and decomposing to remove organic matter and generate a high dielectric composite oxide film, the method has low cost and high efficiency; the method uses a sol-gel method to make a stable and uniformly dispersed colloid, and the colloid is attached to the surface of the foil foil. Although the foil electrostatic capacity is improved, However, the water resistance is still poor. For a long time, other properties will also be affected.