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Turnover box manufacturers analyze the application and difference of talc and calcium carbonate in plastic modification

by:Qusheng     2021-03-07
Turnover box manufacturers analyze the application and difference of talcum powder and calcium carbonate in plastic modification. Talc powder and calcium carbonate are used for filling. The main purposes are:   1. Increase dimensional stability (that is, reduce shrinkage)  2 . Increase the stiffness of the material,     3. Increase the heat resistance of the material,     4. Reduce the cost of materials,     but also has its shortcomings:     1. Density increased,     2. Bad use, impact toughness decreased,     3. The drop. Talcum powder and calcium carbonate have the same particle size distinction, generally 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, of course, there are more fine, and generally used in plastics can choose 800 mesh and 1250 mesh. Two, this can maximize the performance/price ratio.   About the difference between talcum powder and calcium carbonate:  1. The shape of talc powder is flake, so it has higher rigidity, dimensional stability and heat resistance temperature, and has a good reinforcement effect.  2. Calcium carbonate is generally granular, so its stiffness and other aspects are not as good as talc, but its price is lower, and its whiteness is high, and it has little impact on plastic impact toughness.   3. Talc has a nucleating effect on polypropylene, while calcium carbonate has no obvious effect in this respect.  4. Calcium carbonate can generally be divided into light calcium carbonate and heavy calcium carbonate, but talc powder does not have this distinction, talc powder is ground from natural minerals. Calcium carbonate/talc powder composite reinforced PP, its performance is as follows: content tensile strength Mpa bending strength Mpa bending modulus MPa Rockwell hardness model shrinkage rate% 20% calcium carbonate 27.84020001050.8720% talc 294213001000.8210% calcium carbonate + 10% talc Powder 324525001300.74
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