Calcium carbonate for chemical industry can be used as filler in papermaking, coatings, plastics, rubber and other industrial production, and can also be used as an additive in fertilizers, pesticides and other chemicals. The grade and use are mainly distinguished according to the mineral, content, mesh, whiteness and impurity content of calcium carbonate #Calcium carbonate#

Calcium carbonate for chemical industry can be used as a filler in the production of paper, coatings, plastics, and rubber, and as an additive in fertilizers, pesticides, and other chemicals. The grade and use are mainly determined by the mineral, content, fineness, whiteness, and impurity content of the calcium carbonate #calcium carbonate#

Application of Calcium Carbonate in the Plastics Industry

China's annual output of plastic products has exceeded 30 million tons. Powder fillers account for 10% of the total output of plastic products, and calcium carbonate accounts for 70% of all powder fillers. Currently, China's plastics industry uses at least 2.1 million tons of calcium carbonate of various specifications annually, with a vast market. Calcium carbonate has become the preferred filler material in the plastics processing industry due to its low price, ease of use, and few side effects.

Adding calcium carbonate to plastics can improve the dimensional stability, hardness, and rigidity of plastic products. The addition of calcium carbonate can change the rheological properties of plastics. Calcium carbonate powder helps with mixing with other components, improving the processing performance of plastics, and increasing light scattering. Due to its high whiteness, calcium carbonate has a good whitening effect in plastic products and significantly improves the matting properties. In addition, the price of calcium carbonate is much lower than that of plastics, increasing the volume of products and reducing the cost of plastic products.

Application of Calcium Carbonate in Adhesives

Calcium carbonate, as a semi-reinforcing filler in adhesives, can modify the properties of the adhesive layer and reduce the cost of the adhesive, essentially without reacting with the base material. Adding a certain amount of calcium carbonate to the adhesive can increase its bonding strength, hardness, heat resistance, dimensional stability, and reduce the curing shrinkage rate and coefficient of linear expansion. For example, commonly used glass glue has very poor bonding strength without reinforcing fillers. Adding calcium carbonate can improve the strength of the bonded joint, increase surface hardness, increase viscosity and thermal conductivity, increase impact toughness and wear resistance, improve the media resistance of the adhesive, and reduce costs.

Application of Calcium Carbonate in the Paper Industry

Using calcium carbonate in the paper industry can result in paper with good brightness, solid structure, good writability, uniform coating, low friction, easy dehumidification, and easy drying. As papermaking technology shifts from acidic to alkaline and neutral, calcium carbonate has begun to be widely used in the paper industry. Currently, the paper industry is the largest application area for calcium carbonate, with an annual consumption of over 10 million tons, replacing wood pulp and other pigments to improve the brightness, opacity, porosity, and bulk density of paper.

Application of Calcium Carbonate in the Coatings Industry

Calcium carbonate is the primary filler in coatings. It has advantages such as high brightness, low oil absorption, low density, and low cost. It requires less emulsion, reducing the cost of latex paint while providing a skeleton structure to improve the thickness, hardness, and wear resistance of the coating film. At the same time, ultrafine heavy calcium carbonate has strong spatial barrier ability and can fully exert the hiding power of titanium dioxide when used in coatings, reducing the amount of titanium dioxide added. Currently, China's annual output of coatings is about 14 million tons, and the industry's demand for heavy calcium is about 3 million tons.