What is the function of ultrafine modified calcium carbonate?
What are the functions of ultra-fine modified calcium carbonate?
Ultrafine calcium carbonate is a novel nanotechnology-based solid raw material with wide-ranging applications, immense potential, and high value for development, design, and use.
So, what are the functions of ultra-fine modified calcium carbonate?
What are the functions of ultra-fine modified calcium carbonate? 1. Enhancing dimensional stability of plastic products: Calcium carbonate acts as a reinforcing framework in plastics, thereby influencing their dimensional stability. 2. Increasing hardness and stiffness of plastic products: In plastics—especially flexible PVC—incorporation of calcium carbonate leads to a gradual increase in hardness, accompanied by a corresponding decrease in elongation at break. Calcium carbonate with fine particle size and high oil absorption exhibits a strong annual rate of hardness increase; conversely, calcium carbonate with lower oil absorption results in a smaller annual increase in plastic hardness. In flexible PVC, heavier-grade calcium carbonate shows a relatively modest increase in hardness, whereas lighter-grade precipitated calcium carbonate demonstrates a more pronounced effect. Generally, calcium carbonate does not provide significant reinforcement in plastics such as epoxy resins; however, its particles are readily wetted by the resin matrix, so its stabilizing effect primarily serves to enhance the stiffness, elastic modulus, and hardness of the epoxy system. As the dosage increases, compressive strength and ultimate elongation at break tend to decline. Different types of calcium carbonate, when used at varying dosages, yield different levels of hardness. 3. Improving processing performance of plastics: The addition of calcium carbonate can modify the rheological properties of plastics. A relatively high loading level facilitates better compatibility with other components and enhances the ease of plastic processing and molding. Moreover, especially after surface treatment, calcium carbonate not only increases the hardness of the final product but also improves its surface smoothness and gloss. Its incorporation can reduce shrinkage, thermal expansion coefficient, and stress relaxation in plastic parts, thereby optimizing processing and molding conditions. 4. Enhancing temperature resistance of plastic products: Adding calcium carbonate to common plastic formulations can improve their thermal stability. For instance, incorporating about 40% calcium carbonate into polypropylene can raise the heat deflection temperature by approximately 20°C; at a filler content of 20%, the heat deflection temperature increases by 8–13°C. 5. Improving optical properties of plastics: Many plastic products require opacity, while others demand a highly polished finish. Calcium carbonate can play a beneficial role in achieving these objectives. Ultra-fine calcium carbonate with a fineness of 90 or above delivers a noticeable whitening effect in plastic applications. When combined with polyethylene wax and lithopone, it significantly enhances the polishability of plastic surfaces. In calcium-plastic paper and in low-density polyethylene (LDPE) and high-density polyethylene (HDPE) films, the addition of calcium carbonate can achieve both opaqueness and high polish, making these materials suitable for writing and packaging printing. High-quality, finely ground calcium carbonate can even replace expensive white pigments. 6. Endowing products with specific functional properties: In wire and cable applications, the incorporation of calcium carbonate provides certain insulating benefits, while also improving electroplating and printing performance for some new products. Alternatively, adding ultra-fine calcium carbonate to polyvinyl chloride (PVC) can impart a degree of flame retardancy.
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