6 key parameters of calcium carbonate in plastic filling-2
Moisture and volatile content
The raw materials of calcium carbonate, such as natural marble and calcite, usually do not contain structural water. However, during the processing into ultrafine powders, as well as in subsequent storage and transportation, calcium carbonate is prone to hygroscopicity and accumulation of moisture.
Common methods for moisture control In order to reduce the moisture content in calcium carbonate, a high-speed mixer is usually used for heating and drying. This method can effectively remove the accumulated moisture during processing and storage and transportation, and ensure the stable performance of calcium carbonate in the production of modified masterbatch.
Optimization of modified masterbatch production process In the production of high-content calcium carbonate-filled modified masterbatch, in order to reduce the residual moisture and volatiles, it is recommended to select the following processes: Avoid wet processes Try to avoid using wet processes such as water tank infiltration strand pelletizing or water ring granulation, because these processes are prone to increase the moisture content, which is not conducive to the stability of product quality.
Use dry pelletizing process It is recommended to use crawler drive net dry pelletizing process or grinding surface hot cutting granulation process. These processes can not only improve production efficiency, but also minimize the moisture and volatile content in the modified masterbatch, thereby significantly improving product quality.
