Outdoor silver powder coating and preparation method thereof

Abstract

The invention provides an outdoor silver powder coating which is prepared by non-floating aluminum powder and bottom powder by a bonding process. The bottom powder in preparation raw materials contains, by weight, the following components: 55-65% of carboxyl polyester resin, 4.5-5.5% of a curing agent, 0.8-1.5% of a flatting agent, 0.5-1% of wax powder, 10-20% of high-gloss barium sulfate and 15-25% of a white pigment, wherein the glass transition temperature of the carboxyl polyester resin is 55 DEG C or above, an acid value is 32-37 mg of KOH per g, the viscosity of a conical plate is 2800-3800 mPa.s at 200 DEG C, the curing agent is triglycidyl isocyanurate, the flatting agent is NN'-ethylene bis-stearamide, and the non-floating aluminum powder accounts for 0.05-2% of the preparation raw materials. The adopted wax powder, high-gloss barium sulfate and the NN'-ethylene bis-stearamide can make the white pigment uniformly dispersed in the resin, so that it can be avoided that the whitepigment in the bottom powder is dispersed ununiformly to interfere the bonding of the non-floating aluminum powder, and the non-floating aluminum powder is uniformly adhered to the surface of the bottom powder particles in the bonding process. Therefore, the non-floating aluminum powder is uniformly dispersed in paint film, and a better appearance effect and high gloss are obtained.

Description

technical field [0001] The invention relates to the technical field of powder coatings, in particular to an outdoor silver powder coating and a preparation method thereof. Background technique [0002] Powder coating is a powdery solid coating that does not contain organic solvents or water. Its coating is also sprayed on the surface of the object to be coated in powder form, and is melted, leveled, and solidified to form a film. Compared with traditional solvent-based coatings, powder coatings can effectively reduce the pollution caused by solvent emissions, and their corrosion resistance, scratch resistance, and impact resistance can be further improved. With the improvement of people's living standards, the requirements for the quality of life are also increasing. People are more pursuing aesthetic effects on the objects to be painted, such as outdoor walls, billboards, etc., all hope to produce a certain degree of gloss and have a A certain color sensory effect, so ther...

AI Technical Summary

Problems solved by technology

However, since aluminum is a metal with strong metallic properties, it is easy to oxidize. When it is corroded by water and oxygen, the formed silver floating layer is easily oxidized and loses its original luster.

Therefore, some researchers currently use non-leafing aluminum powder to replace floating silver. During the curing process of powder coatings, non-floating aluminum powder can be distributed in the paint film to form a flashing effect. However, the use of outdoor silver powder coatings needs to reach a certain level. High hardness and mechanical properties are usually added with high content of fillers and pigments. Regardless of the preparation process, if the fillers and pigments are not uniformly dispersed in the resin, the dispersibility of the non-floating aluminum powder will be greatly affected. This leads to poor mirror effect, which makes the cured paint film dark and glossy.

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