Decoating liquid

Abstract

A kind of deplating solution for smearing, it comprises sulfuric acid, oxidizing agent and thickening agent, and described oxidizing agent comprises at least one in nitric acid, hydrogen peroxide, potassium permanganate, potassium dichromate and chromium trioxide, and described thickening agent It is at least one of polyvinyl alcohol and hydroxyethyl cellulose. It can also include the anti-staining salt sodium m-nitrobenzenesulfonate that can remove copper layer and nickel without corrosion on the plastic surface, and can also include the accelerator copper sulfate used to accelerate the removal of copper layer. The stripping solution of the present invention , due to the thickener polyvinyl alcohol, which enhances the viscosity coefficient of the stripping solution, it is very suitable for partial smearing and deplating on the surface of the product, avoiding the flow of the stripping solution, so as to ensure a good effect of smearing and deplating; further due to The oxidant does not include nitric acid, which can effectively reduce the adverse effects of corrosion on the plastic material itself during deplating. In addition, it will not produce a large amount of NO2 yellow smoke due to the existence of nitric acid, which can reduce environmental pollution and avoid corrosion of workshops and equipment. .

Description

technical field [0001] The invention relates to a deplating solution, in particular to a deplating solution for smearing, which is mainly suitable for removing the copper-plated layer or nickel-plated layer on the surface of plastic products, especially for partial deplating of the product surface. Background technique [0002] In order to make plastic products beautiful and durable, and increase the added value of products, the surface of plastic products is often metallized by electroless copper plating or electroless nickel plating. In order to recycle the surface metallized defective or waste products, it is necessary to remove the metal layer, that is, deplating. In the prior art, the deplating operation is to immerse the product to be deplated in the deplating solution to complete the deplating. If a certain part of the product is deplated, this method is applicable. The better method is The deplating solution is applied to the position to be stripped, but the deplati...

AI Technical Summary

Problems solved by technology

In the prior art, the deplating operation is to immerse the product to be deplated in the deplating solution to complete the deplating. If a certain part of the product is deplated, this method is applicable. The better method is The deplating solution is applied to the part to be deplated, but the deplating solution of the prior art is easy to flow because the viscosity is too small, so the effect of partial coating and deplating is not ideal

In addition, in the prior art, often adopt the sulfuric acid (H 2 SO 4 ) and nitric acid (HNO 3 ) of the stripping solution for deplating, the above-mentioned stripping solution is likely to have an adverse effect on the plastic material itself due to the presence of strong oxidant nitric acid during deplating. In addition, it is also due to the existence of strong oxidant nitric acid. Metal reaction, nitric acid is not only a strong oxidant, but also acts as an acid, especially under heating conditions, nitric acid is reduced, resulting in a large amount of NO 2 Yellow smoke pollutes the air, causes harm to the human body, and is also seriously corrosive to the plant and equipment