Grainy topcoat used in color plate surface coating, and preparation method thereof

Abstract

The invention provides a grainy topcoat used in color plate surface coating, and a preparation method thereof. The invention belongs to the technical field of paints. The topcoat assists in ameliorating a problem of steel surface decoration effect. The grainy topcoat is characterized in comprising the substances of, by weight: 45-55 parts of SK-ES410 saturated polyester resin, 8-11 parts of CYTEC303 amino resin, 30-35 parts of a pigment, 0.3-1.0 parts of a BYK110 dispersing agent, 0.5-1.2 parts of a BYK354 leveling agent, 5-10 parts of a solvent, and 0.3-1 parts of a KING N-5225 catalyst. The substances are blended and grinded, such that the topcoat is obtained. According to the topcoat provided by the invention, a formula is optimized, paint film surface state is changed, product application time is prolonged, and color plate surface coating quality is improved. As a result of tests, various indexes of the product are better than existing products, product service life is greatly improved, and product colors are enriched.

Description

technical field [0001] The invention relates to a coil coating, in particular to a topcoat which is used to produce a wood-grain-like surface effect after coating the surface of a color plate, can effectively prolong the service life and enrich the color of the product, and belongs to the technical field of paint and coating. Background technique [0002] The color plate finish is to apply paint on the surface of the galvanized sheet, also known as the coil topcoat, which is a kind of paint used for the surface coating of the galvanized sheet for decoration and protection. It not only requires excellent adhesion with the primer, but also can beautify the visual effect of the product and protect the substrate from environmental and other factors affecting the service life. At present, the topcoat used in coil coating generally adopts the following raw materials in its formulation: ordinary saturated polyester, ordinary amino resin, pigment, additive, and solvent. After the a...

AI Technical Summary

Problems solved by technology

The disadvantages of this kind of paint are: 1. The appearance of the paint film is simple and has no three-dimensional effect; 2. The use time is short, the weather resistance is poor, and the color is single; 3. The solid content in the formula is low, and the VOC emission is high, which is not conducive to environmental protection

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