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Volume 9
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10.3390/min9020112
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Article

Surface Organic Modification of CaCO3-TiO2 Composite Pigment

by
Sijia Sun
,
Hao Ding
*,
Yanpeng Zha
,
Wanting Chen
and
Zhuoqun Xu
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(2), 112; https://doi.org/10.3390/min9020112
Submission received: 2 December 2018 / Revised: 30 January 2019 / Accepted: 11 February 2019 / Published: 15 February 2019
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Abstract

To improve the properties and dispersibility of CaCO3-TiO2 composite pigments (CaCO3-TiO2) in organic matrices, the surface modification of CaCO3-TiO2 was performed with sodium stearate (SS) as an organic modifier by wet ultra-fine grinding in a stirred mill. The pigment properties of modified CaCO3-TiO2 and its dispersibility in organic media were tested and characterized. The binding mechanism between CaCO3-TiO2 and SS was explored by infrared spectrometry (IR) and X-ray photoelectron energy spectroscopy (XPS). The results showed that the mechanical grinding strength and SS dosage had a significant effect on the activation index and sedimentation rate of CaCO3-TiO2. After surface modification, the surface of CaCO3-TiO2 turned from a hydrophilic surface to a hydrophobic surface and the surface free energy was reduced. In addition, the hiding property and dispersibility of CaCO3-TiO2 in the organic medium were significantly improved. IR and XPS results indicated that the modifier SS was adsorbed on the surface of CaCO3-TiO2 by chemical combination.
Keywords: CaCO3-TiO2 composite pigment; surface organic modification; dispersibility; modification mechanism CaCO3-TiO2 composite pigment; surface organic modification; dispersibility; modification mechanism

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MDPI and ACS Style

Sun, S.; Ding, H.; Zha, Y.; Chen, W.; Xu, Z. Surface Organic Modification of CaCO3-TiO2 Composite Pigment. Minerals 2019, 9, 112. https://doi.org/10.3390/min9020112

AMA Style

Sun S, Ding H, Zha Y, Chen W, Xu Z. Surface Organic Modification of CaCO3-TiO2 Composite Pigment. Minerals. 2019; 9(2):112. https://doi.org/10.3390/min9020112

Chicago/Turabian Style

Sun, Sijia, Hao Ding, Yanpeng Zha, Wanting Chen, and Zhuoqun Xu. 2019. "Surface Organic Modification of CaCO3-TiO2 Composite Pigment" Minerals 9, no. 2: 112. https://doi.org/10.3390/min9020112

APA Style

Sun, S., Ding, H., Zha, Y., Chen, W., & Xu, Z. (2019). Surface Organic Modification of CaCO3-TiO2 Composite Pigment. Minerals, 9(2), 112. https://doi.org/10.3390/min9020112

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