What are the basic requirements for calcium carbonate for plastics?
(1) The purity of calcium carbonate should be high, the compounds of silicon, iron and other elements should be as low as possible, and the content of harmful heavy metal elements should be more strictly required.
(2) The whiteness should be as high as possible.
(3) The lower the oil absorption value, the better. Through the surface treatment of calcium carbonate, the calcium carbonate particles surface coating, can reduce its oil absorption value.
(4) Choose the appropriate particle size, not the finer the better. For filler plastics, the smaller the particle size of the filler used, the same filler ratio, the mechanical properties of the filler plastic materials, but the premise is that the powder particles in the plastic matrix uniformly dispersed. The different particle size distribution of the filler has different effects on plastic products. For some plastic products, to meet the basic requirements (i.e., the maximum particle size does not exceed a certain value), some of the finer more good, and some hope that some of the coarser good.
(5) whether the activation depends on user demand. Those who produce large quantities of products, and the formula and processing technology are very stable plastics processing enterprises only require the provision of activated calcium carbonate products. More plastics processing enterprises would rather carry out their own surface treatment, they use the treatment equipment and treatment agent is often more of their own characteristics.
