In fact, calcium carbonate can also be used in some high-end applications, such as calcium carbonate used as a pore-forming agent for breathable films. After proper grinding, grading and high-quality modification, calcium carbonate can be used in the field of breathable films, and the market price can be as high as 3, yuan/ton. However, this technology has long been monopolized by foreign countries and protected by patents, and the German Hosokawa Alpine Company with this technology can only promote and sell related equipment in a limited range during the patent protection period. In 219, the patent protection of this technology has been partially unfrozen, and China calcium carbonate enterprises have the opportunity to enter this high-end field.
In addition, nano-calcium carbonate can partially replace titanium dioxide in automobile paint, and can also play the role of isolation layer and improve the mechanical properties of paint. Food-grade calcium carbonate also belongs to the high-end field with mature application of calcium carbonate. Electronic-grade calcium carbonate is used as a grain refiner in PTC thermistors, which can inhibit the excessive growth of BaTiO3 grains, the main component, and improve the voltage resistance of PTC. In addition, calcium carbonate has excellent potential to become a phosphor matrix. At present, the world-renowned lighting manufacturers have applied heavy calcium carbonate as a luminescent material on a large scale. Source 36powder.com