Plastic industry

The addition of light calcium carbonate plays a structural role in plastic products, as a filler and expander including injection molding and blow molding, and therefore has a great effect on reducing production costs. Filling plastic with calcium carbonate is similar to adding a skeleton to plastic, which is used for PP, PE, PVC sheets and pipes.

It has a great effect on the dimensional stability of plastic products through good properties, including:
– Hardness: In plastics, especially soft PVC, the hardness gradually increases with the addition of calcium carbonate, and the elongation decreases with the increase of hardness. Light calcium carbonate with fine particles and high oil absorption has a significant increase in hardness, and it helps it mix with other components and also helps in plastic processing and shaping.
– Reduced oil absorption
– Improve the surface gloss and surface smoothness of the product: Adding light calcium carbonate can reduce the shrinkage, linear expansion coefficient, and creep properties of plastic products, creating conditions for processing and shaping.
– Improve the heat resistance of plastic products Adding light calcium carbonate to general plastic products can improve the heat resistance. For example, adding about 40% of light calcium carbonate to polypropylene increases the heat resistance by about 200 ° C. When the filling ratio is less than or equal to 20%, the heat resistance temperature increases by 8 to 130 ° C.
– Improve the astigmatism of plastics: In plastic products, some products require bleaching and darkening, and adding light calcium carbonate can play a certain role in this regard. Calcium carbonate with better whiteness can also replace expensive white pigments.
– Non-toxic and biodegradable: Calcium carbonate is non-toxic and tasteless. It is a common mineral in the natural environment. It is suitable for adding to biodegradable plastics and food packaging materials without adversely affecting people and the environment. Studies have also shown that biodegradable plastics added with calcium carbonate decompose faster in the soil. The use of calcium carbonate reduces energy use during the manufacturing process, thus reducing the carbon emissions and greenhouse gas impact of the final plastic products.
Some of the plastic products that use calcium carbonate in their manufacture are: some electrical equipment parts, some car parts, children’s toys, plastic garbage bags, tableware, food containers and plates, chairs, sanitary and decorative materials, and glue…