| Effect of Grain Size and Replacement Ratio on the Plastic Properties of Precipitated Calcium Carbonate Using Limestone as Raw Material |
| Chul Seoung Baek, Kye Hong Cho, Ji-Whan Ahn1 |
Korea Institute of Limestone and Advanced Materials (KILAM)
1Korea Institute of Geoscience and Mineral Resources (KIGAM) |
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| ABSTRACT |
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Precipitated calcium carbonate(PCC) inorganic fillers for plastic offera higher replacement ratio with improved mechanical properties than any other inorganic fillers. Due to its secure economic feasibility, its fields of application areexpanding. For optimized PCC grain size and polymer replacement ratio, it is good to maintain at least $0.035{mu}m$ grains and keep double the grain size of distance between particles, depending on the molecular weight and volume replacement rate of the polymer. PCC has unique characteristics, ie, with smaller grain size, dispersibility decreases, and if grain size is not homogenous, polymer cracking occurs. The maximum replacement ratio of PCC is approximately 30%, but in the range of 10 - 15% it produces the highest mechanical strength. When mixed with a biodegradable plastic like starch, it also improves initial environmental degradability. |
| Key words:
Precipitated calcium carbonate(PCC), Limestone, Polymer, Particle size, Replacement ratio |
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