What are the roles of calcium carbonate in plastics?

　　We know that adding calcium carbonate to plastics can reduce the shrinkage of the resin, change the rheology, and control the viscosity, which is very helpful to improve the quality of the plastic. So, what other role does it play in plastics?

　　1. Improve the hardness and rigidity of plastic products. In plastics, especially as soft polyvinyl chloride, the hardness increases with the gradual development of the calcium carbonate compounding amount, and the elongation decreases as the hardness increases. Calcium carbonate with fine particles and high oil absorption has a large increase in hardness. Conversely, the hardness and growth rate of plastics are small.

　　Generally speaking, calcium carbonate plastic (resin) cannot play a reinforcing role, and its particles tend to be penetrated by the resin, so its effect is to increase the hardness, elastic modulus and hardness of the resin.

　　2. The addition of calcium carbonate to improve the dimensional stability of plastic products can act as a skeleton in plastic products and has a great impact on the dimensional stability of plastic products.

　　3. Improve the heat resistance of plastic products. Adding calcium carbonate to general plastic products can improve the heat resistance.

　　4. Reduce the cost of plastic products. The prices of ordinary light calcium carbonate and heavy calcium carbonate are far lower than the price of plastic products. The addition of calcium carbonate will reduce the cost of plastic products.

　　 5. The addition of calcium carbonate can change the fluid properties of plastics. Calcium carbonate powder is often added in a relatively large amount, which helps it to be mixed with other ingredients and also helps plastic processing and formation.

　　6. ​​Improve the astigmatism of plastics. Among plastic products, some products require whitening and opacity, while other products require matting. The addition of calcium carbonate can play a certain role in this regard.

　　7. It can make the product have some special properties. Adding calcium carbonate to the cable material has a certain insulation effect, and it can also change the electroplating performance and printing performance of some products.