Preparation,Characterization of Hydrophobic Spherical CaCO3 Particles and Influence on Properties of Polypropylene

doi:10.3969/j.issn.0251-0790.2012.09.025

Abstract

Abstract:

Monodisperse hydrophobic spherical CaCO₃ particles were prepared by carbonation in the presence of dodecyl dihydrogen phosphate(DDP). The surface property of CaCO₃ particles was transformed from hydrophilic to hydrophobic when the mass ratio of DDP to CaCO₃ changed from 0 to 2%. X-Ray diffraction(XRD) patterns showed that the crystal form of CaCO₃ particles was turned from calcite to aragonite with increasing the dosage of DDP in the reaction. FTIR spectra indicated the existence of the alkyl groups from the DDP in the products. When the mass ratio of DDP to CaCO₃ was 2%, the active ratio reached 99% and the contact angle of modified CaCO₃ particles was 120.43°. Simultaneously, the effects of the reaction temperature and the dosage of DDP on the morphology and behaviors of aragonite crystals were discussed. When the schematic illustration on the formation process of hydrophobic spherical CaCO₃ particles was discussed in the work. When the obtained modified CaCO₃ was added into polypropylene(PP), the mechanical properties and processabilities of PP improved greatly.

Key words: Hydrophobicity, Spherical CaCO₃, Dodecyl dihydrogen phosphae(DDP), Surface modification

CLC Number:

O647

TrendMD:

ZHAO Li-Na, WANG Ji-Ku, KONG Zhi-Guo, WANG Zi-Chen. Preparation,Characterization of Hydrophobic Spherical CaCO₃ Particles and Influence on Properties of Polypropylene[J]. Chem. J. Chinese Universities, 2012, 33(09): 2019.

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Preparation,Characterization of Hydrophobic Spherical CaCO₃ Particles and Influence on Properties of Polypropylene

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