1, talc and calcium carbonate are used as fillers, the purpose are: 1, increase the dimensional stability (i.e. shrinkage decrease); 2, increase the stiffness of the material; 3, increasing the heat resistance of materials; 4 , reduce material costs and other aspects; but also have its drawbacks: 1, increased density; 2, poor use, impact toughness decreased; 3, material gloss has decreased.
2, talcum powder and calcium carbonate have the same granularity, generally 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, of course, there are finer, and generally used in plastic can choose 800 mesh and 1250 Look at these two, this can make the performance / price ratio the highest.
3, the price of talcum powder has fluctuated, in general, according to the number of orders to determine the price will not have much problem, such as: 800 mesh general price is between 700 to 850 yuan, 1250 is also in the 1000 to Between 1280 yuan. It is not normal if the price is too high or too low.
About the difference between talc and calcium carbonate:
1. The shape of talc powder is flake-shaped, so it has higher rigidity, dimensional stability and heat-resistant temperature, and the reinforcing effect is good.
2, calcium carbonate is generally granular, so its rigidity and other aspects are not as good as talcum powder, but its price is lower, and whiteness is high, while the impact on plastic impact toughness is small.
3. Talc has a nucleating effect on polypropylene, and calcium carbonate has no obvious effect in this respect.
4, calcium carbonate can be generally divided into light calcium carbonate and heavy calcium carbonate, and talc powder does not have this distinction, talcum powder is ground from natural minerals.
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