Aragonite Precipitated Calcium Carbonate – Filler for Light Weight Plastics
Journal Title: Scholars Journal of Engineering and Technology - Year 2015, Vol 3, Issue 3
Abstract
A new kind of functional filler, aragonite precipitated calcium carbonate (PCC) which has a specific needle shaped morphology and is prepared from natural limestone is of high industrial importance and is an eco-friendly filler for light weight plastics and also recycled plastics. Aragonite precipitated calcium carbonate was synthesized from natural limestone by carbonation process under optimal experimental conditions. Calcium carbonate is synthesized by carbonation method in which gaseous CO2 is injected to the Ca2+ ion solution/slurry to precipitate calcium carbonate. The carbonation process can be proceeded by liquid – liquid – gas, gaseous CO2 is injected to a mixture of MgCl2 and Ca(OH)2 solutions. The synthesis of aragonite-type precipitated calcium carbonate (PCC) was carried out by varying the reaction temperature and flow rate of gaseous CO2. Higher temperatures and flow rates were favoured for the synthesis of phase-pure aragonite-type PCC. The aspect ratio of aragonite-type PCC was controlled by the reaction temperature and CO2 (g) flow rate. In addition, at the same flow rate, the increase in the reaction temperature resulted a higher aspect ratio of the resulting aragonite-type PCC. The average particle size length of aragonite-type PCC was close to 50 µm. We investigated the mechanical properties such as tensile strength, impact resistance, flexural modulus, Young’s modulus and thermal properties of polypropylene homopolymer composites with unmodified aragonite-type PCC. The impact resistance and flexural modulus of polypropylene composite with 9 wt% of aragonite-type PCC were 79 J/m and 1300 MPa, respectively. Keywords: calcium carbonate, gaseous CO2, Ca(OH)2, flexural modulus.
Authors and Affiliations
Thenepalli Thriveni, Ch. Ramakrishna, Yujin Jegal, Ji-Whan Ahn
Keywords
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