The plastic pigments of powder coatings are an important part of powder coatings, giving the coatings a bright and colorful color. Pigments used for powder pigments must not chemically react with resins, curing agents, additives and other components during melt extrusion or baking and curing, and they will not change color at melt extrusion and baking curing temperatures; of course, As with other coatings, it requires good coloring power and hiding power, so that the amount of pigment will be less; furthermore, the dispersion of the pigment in the resin is better, and it is easy to disperse evenly when manufacturing the coating.
Coloring pigments are divided into two categories: inorganic pigments and organic pigments. Organic pigments are brighter than inorganic pigments and have higher coloring power and transparency. Most organic pigment varieties are less toxic, while the most advantageous chromium-based inorganic pigment varieties are toxic. Therefore, the substitution of chromium and lead should be considered. Low-grade organic pigments are inferior to inorganic pigments in light fastness, weather fastness, heat resistance and solvent resistance. In most organic pigments, the cheap and strong pigments are only blue and green phthalocyanine pigments. For yellow, red, and purple organic pigments, pigments with excellent resistance are very expensive. However, high-end organic pigments not only have excellent light fastness, weather fastness, heat resistance and solvent resistance, but also are superior to inorganic pigments in acid and alkali resistance. Considering the convenience of color matching, we start with the index numbers of yellow, orange, red, green, blue, and purple to introduce the choice of organic pigments.