Calcium carbonate is one of the most widely used fillers in plastics. It is cheap, widely available, and has a low relative density. It has an incremental effect in plastics and can also improve processing performance and product performance. This material is soft and has less wear on kneaders and molding machines. At the same dosage, the surface scratches and bending whitening of products filled with light calcium carbonate are less than those filled with heavy calcium carbonate. The biggest feature of light calcium carbonate is that it has a reinforcing effect and can improve the impact strength of products.
Heavy calcium carbonate can be used in plastics to reduce costs. It has good affinity with resins and high dispersion. Its refractive index is similar to that of plastics. It is easy to color and can improve the strength and stability of plastic products. The most mature industry for the application of nano calcium carbonate is the plastics industry, which is mainly used in high-end plastic products.
Calcium carbonate is a non-toxic substance. The US FDA recognizes this product as a "safe substance" and allows it to be used in plastic products that come into contact with food. Calcium carbonate is compounded with polyolefin resins such as polyvinyl chloride, polyethylene, and polypropylene to manufacture calcium plastic materials.
Calcium carbonate filled polyvinyl chloride is made by kneading and mixing polyvinyl chloride, calcium carbonate (such as heavy calcium carbonate, light calcium carbonate, micronized calcium carbonate, precipitated calcium carbonate, activated calcium carbonate, etc.) and other additives according to the ingredient ratio, and then granulating, extruding or injection molding into the required products; it can also be calendered and pressed into sheets or plates. It has the characteristics of flame retardancy, acid and alkali resistance and chemical resistance, water resistance, moisture resistance, sound insulation and good colorability. It also has the advantage of being cheaper than ordinary PVC plastics.
Calcium carbonate filled polyethylene plastic is a composite material in which a large amount of calcium carbonate is evenly distributed in a small amount of continuous resin phase. In addition to the properties of plastic, wood and paper, it also has the characteristics of cold resistance, water resistance, heat resistance, shock resistance, sound insulation, etc. The product has no corrosive odor, but is easy to burn. The combustion performance is similar to that of paper and wood. The thermal stability and mechanical properties are good, and the softening point is high. It still maintains high strength at low temperatures. If a foaming agent is added, a lightweight wood substitute can also be made. Its physical and mechanical properties such as rigidity, hardness, compression strength, dimensional stability and heat resistance are better than those of plastic products made of pure polyethylene resin. The creep and molding shrinkage are small, the processing performance is good, and it is easy to process secondary processing.
Calcium carbonate filled polypropylene is a product made by efficiently mixing polypropylene resin with a certain amount of calcium carbonate and other fillers, as well as necessary additives, and extruding and granulating to obtain filled polypropylene of different grades.
Calcium carbonate filled polypropylene can be used as integrated circuits, microwave oven parts, toys, car guard plates and exterior decoration, electrical equipment parts, etc. Self-extinguishing calcium carbonate filled polypropylene has good high-frequency electrical insulation, electrical properties that are less affected by temperature and humidity, and FV-0 group flame retardant properties, so it is suitable for occasions with high flame retardancy requirements such as TV output high-voltage packages.
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