The role of calcium carbonate in the coatings industry

In coatings, calcium carbonate acts as a white pigment and acts as a skeleton; it can be used as a body pigment in the coatings industry. The filling of calcium carbonate enhances the deposit and permeability of the primer to the surface of the substrate. At the same time, heavy calcium carbonate (heavy calcium powder, heavy calcium) is the main body of the putty filler. In thick lacquers, calcium carbonate thickens and thickens the coating to provide a filling and filling effect. Therefore, heavy calcium carbonate and light calcium carbonate are usually added to the thick paint, and heavy calcium carbonate (heavy calcium powder, heavy calcium) is added up to 24.6% to 78.5%. In topcoats, ie, topcoats, semi-gloss and matt paints use a method of adding body pigments to reduce gloss. Calcium carbonate is the ideal matting filler.

Calcium carbonate can be used as one of the additives in colorful coatings to achieve the purpose of reducing the cost of materials and improving the decorative effect. In the colorful paint, light calcium carbonate (light calcium, light calcium powder), that is, precipitated calcium carbonate, is used, and the oil absorption is about 80%, the particle size is about 15 micrometers, the specific gravity is about 2.7, and the refractive index is about 1.60. It can also be ground with heavy calcium carbonate (calcite powder), that is, natural marble. In the metal anti-rust coating, calcium carbonate is a body pigment, and there is a little anti-rust effect. The appropriate amount of calcium carbonate in the metal anti-rust coating is 30%. In recent years, the development of the coatings industry has led to a sharp increase in the demand for calcium carbonate.