Generally, most of the plastic masterbatches are added
Calcium Carbonate, but they must be calcite crystal ores. Because the ores are different, although they are all calcium carbonate, some can be produced. Some cannot be produced. Talcum powder and calcium carbonate can be used. In terms of cost, calcium carbonate is lower than talcum powder. In terms of production technology, calcium carbonate is easier to process than talcum powder. Talcum powder and calcium carbonate shall be added to the polypropylene granule for packing belt, and the ratio is: polypropylene: talcum powder: calcium carbonate=70:25:5. For woven bags, calcium carbonate should be used. The addition amount can reach more than 30 portions. Pay attention to the temperature during processing.
1. Talc powder and calcium carbonate are used for filling, and their main purposes are: 1. increase dimensional stability (i.e., reduce shrinkage), 2. increase the rigidity of the material, 3. increase the heat resistance of the material, 4. reduce the cost of the material, etc., but there are also some defects: 1. increase the density, 2. poor use, impact toughness, 3. material luster has decreased.
2. Talc powder and calcium carbonate have the same particle size difference, generally 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, and of course, there are finer ones. Generally, 800 mesh and 1250 mesh can be selected for plastic, which can make the performance/price ratio the highest.
3. The price of talc powder fluctuates. Generally speaking, it is not a big problem to determine the price according to the number of items. For example, the price of 800 items is between 700 and 850 yuan, and that of 1250 items is between 1000 and 1280 yuan. It is abnormal for the price to be too high or too low.
About the different use of talc powder and calcium carbonate:
1. The shape of talc powder is flaky, so it has higher rigidity, dimensional stability, heat resistance and good reinforcement effect.
2. Calcium carbonate is generally granular, so its rigidity and other aspects are not as good as talc powder, but its price is lower, and its whiteness is high, and its impact toughness of plastics is small.
3. Talc powder has nucleating effect on polypropylene, while calcium carbonate has no obvious effect on this aspect.
4. Calcium carbonate can generally be divided into Light Calcium Carbonate and Heavy Calcium Carbonate, but talc powder has no such distinction. Talc powder is ground from natural minerals.
