Metal powder coating is the addition of metal pigments to the base powder, which brings a metallic effect to the surface and has good decorative properties. With increasingly strict national environmental laws and regulations, more and more liquid metals are forced to switch to powder coatings. But to produce high-quality and stable performance metal powder coatings, certain technology and experience are required. From an overall technical perspective, including raw material selection, laboratory sampling, production processes, and quality control, while also ensuring safety.

1、 Raw material selection

It is necessary to have a deep understanding of the performance of different types and suppliers of metal pigments in order to apply suitable metal pigments appropriately.

Choose different metal pigments according to the requirements of powder coatings. Common types of metal pigments include aluminum silver powder pigment, pearl pigment, copper gold powder pigment, etc. Metal pigments come in many shades, greatly enriching the variety and decorative properties of powder coatings.

2、 Aluminum silver powder

Aluminum powder has a floating surface and is easy to float to the surface. It is only treated with stearic acid surface and is not weather resistant. This type of finer aluminum powder is used to make mirror silver, with a transparent powder coating on the surface. Unpackaged aluminum pigments are used for imitation chromium and mirror silver effects, and do not have corrosion resistance, so a transparent gloss coating must be used. Due to the possibility of oxidation even under the protection of transparent coatings, these pigments cannot be used for exterior wall coatings in buildings. The particle size of aluminum powder exhibits different properties, ranging from 5um to 75um, and can be divided into several grades. Aluminum pigments with different particle sizes have different brightness, scintillation, color variation with angle, and covering power.

The advantage of aluminum silver powder is its strong metallic texture and easy availability of raw materials. The disadvantage is a single color tone and poor chemical resistance.

3、 Pearl pigment

Pearlescent pigments are inorganic pigments composed of mica chips wrapped in metal oxides with high refractive indices, such as titanium dioxide and iron oxide. High refractive index metal oxides, low refractive index mica chips, and low refractive index surrounding media are arranged in parallel to produce visible rainbow colors. Different colors are produced by different metal oxides and thicknesses. Controlling the coating thickness of titanium dioxide on tiny mica chips can obtain interference colors. Mica coated with other metal oxides such as chromium trioxide or iron trioxide can produce a metallic color. The tempting golden and brown colors are the result of the synchronous mixed coating of titanium dioxide and iron oxide. The advantage of pearl powder is that it has more pearl pink colors and good chemical resistance. Its disadvantage is that the metallic texture is not strong, and the difference compared to aluminum powder is too large.

4、 Copper gold powder pigment

Copper gold powder (also known as gold powder) is a metallic pigment with a flake like structure made from copper zinc alloy through special mechanical processing and surface chemical treatment. It can float in binders, present a golden luster, and have pigment properties.

The advantage of copper powder is that it has a relatively large amount of copper pink color and a strong metallic feel. However, its disadvantages include poor chemical resistance, high specific gravity, large dosage, poor temperature and weather resistance.

The above is all the content shared by Yongji Industrial for metal powder coatings.