Polyformaldehyde product surface processing method

Abstract

A disclosed polyformaldehyde product surface processing method comprises: performing roughening treatment on the surface of a polyformaldehyde product, destroying the crystallization zone of the surface, cleaning the polyformaldehyde product surface subjected to roughening treatment, and immersing in an acid solution to perform surface acidifying treatment, so as to form a continuous netted micropore structure on the surface of the polyformaldehyde product. According to the processing method, the mechanical roughening manner is firstly employed for performing roughening treatment on the polyformaldehyde product, then the acid solution is utilized to process the polyformaldehyde product for forming the netted micropore structure on the product surface, and by utilizing the netted micropore structure, coating or electroplated-layer molecules permeate pores and an fixedly-connected integral body is formed by the molecules and polyformaldehyde, so that the surface adhesion property of the polyformaldehyde product is improved, the bonding force between the polyformaldehyde product surface and paint or an electroplating material is improved, the application of polyformaldehyde is enlarged, and the service life of a coating or an electroplated layer on the surface of the polyformaldehyde product is prolonged.

Description

technical field [0001] The invention relates to a surface treatment method that can be used for polyoxymethylene parts. The surface treatment method can be directly used in the early stage of spraying / electroplating of polyoxymethylene parts, and is suitable for polyoxymethylene that has higher requirements on the appearance of the surface of polyoxymethylene parts. It can also solve the problem that polyoxymethylene is difficult to spray / plate. Background technique [0002] POM is a thermoplastic engineering plastic with high melting point, high density and high crystallinity. Compared with other thermoplastic engineering plastics, it has high strength, good dimensional stability, creep resistance, fatigue resistance, wear resistance, chemical resistance and self-lubrication, and is a kind of thermoplastic with excellent comprehensive performance. Engineering plastics, known as "Saigang", have an irreplaceable position in the application of engineering plastics and have be...

AI Technical Summary

Problems solved by technology

Since this patent only roughens the surface of the polyoxymethylene part, and then adheres the paint film through a soluble water agent (intermediate layer), it cannot form a layer of mesh holes on the surface of the polyoxymethylene part mentioned in this patent. Structure; POM parts and paint are not directly attached, and the surface adhesion strength of the workpiece is low; at the same time, because organic solvents such as polypropylene, xylene, isopropanol, and n-heptane are attached to the surface of the part as an intermediate layer, but After drying, the volatilization of the solvent not only increases the production cost of the spraying process, but also causes great adverse effects on the environment

[0005] Patent application CN 102409320A discloses a treatment method for ABS plastic before electroplating, which includes stress relief, oil removal, roughening, neutralization, etc.; wherein roughening is carried out directly in the chromic acid-sulfuric acid system; due to the introduction of heavy metals Ionic chromium, which has brought great hidden dangers to wastewater treatment and recovery, and can also bring a series of environmental protection issues; the concentration of CrO3 and sulfuric acid is required to account for more than 30% of the intermediate treatment solution, which is harmful to experimental operations and The working environment has higher requirements; the main thing is that this method cannot be applied to POM surface electroplating or pre-spraying treatment, and the obtained result can not realize the purpose of the invention

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