Method for forming punctate pattern on surface of metal

Abstract

The invention discloses a method for forming a punctate decorative pattern on the surface of metal. The method includes the steps that shielding powder is prepared through hot melt adhesive, the shielding powder adheres to the surface of a metal product, a first paint layer is formed in a region unshielded by the shielding powder in a one-time electrophoresis manner, and after the shielding powder is removed, a second paint layer of which the color is different from that of the first paint layer is deposited in the region covered with the shielding powder in a secondary electrophoresis manner, so that the punctate structure of the shielding powder is transferred to the surface of the metal. The hot melt adhesive shielding powder can be dissolved with an organic solvent in a swelling manner to be cleaned and removed or dissolved with hot water to be cleaned and removed or removed through other simple methods without using a strong base or other corrosive substances, and the influence on the paint film structure is avoided; and meanwhile, various punctate patterns can be formed according to the requirements, the manufacturing process is simple, and the application range is broadened.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to a method for forming dot patterns on the metal surface. Background technique [0002] The monotonous metallic or single-color paint surface of metal products can no longer meet people's needs for diversified product appearance. Therefore, while protecting the surface of metal products, a colorful decorative pattern appearance is formed to manufacture decorative products and unify the style with other parts High-quality products or novel and beautiful products are gradually being valued, and their production processes are also developing day by day. [0003] The existing pattern appearance production methods include surface spray coating, heat transfer pattern, printing, etc. The ink layer of these methods is separated from the primer, and only exists on the surface of the product without penetrating the primer, which is easily damaged by wear and corrosion. etc., especially in...

AI Technical Summary

Problems solved by technology

When cleaning the ink, strong alkali or other corrosive substances must be used as cleaning agents, which will cause damage to the primary electrophoretic film layer, thus greatly affecting its performance and appearance, and easily causing environmental pollution

[0005] In addition, the existing inks are often coated by screen printing, which can only be applied to flat products, and cannot be applied to curved surfaces or other complex structures. It is also difficult to produce similar natural random spot patterns, and the formed spot patterns have hard borders , cannot achieve a variety of decorative effects, and the screen printing process is complicated, the screen life is limited, the cost is high, and switching is difficult, which limits its application

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