Comparative Evaluation of Pigment-Extender Effects of Calcium Carbonate and Kaolin in Emulsion Paint

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Author(s) Igwebike-Ossi | Clementina Dilim
Pages 560-568
Volume 4
Issue 12
Date December, 2015
Keywords Emulsion Paint, Pigment-Extender, Calcium Carbonate, Kaolin, China Clay
Abstract

This work investigated the pigment-extender effects of calcium carbonate and kaolin (china clay) in emulsion paint by determining and comparing some important physical and performance properties of the emulsion paints produced with the two extenders. The extenders were first sieved to obtain a uniform particle size range of 32-63 microns (µm) used in the formulation of the emulsion paints. The compositional levels of the extenders in the emulsion paints were varied from 2-12% by weight. The results of the tests showed that kaolin-filled emulsion paints had higher specific gravity values, higher pigment volume concentration (PVC) values and higher viscosities than CaCO3-filled at all levels. However, the calcium carbonate-filled emulsion paints had more brilliant whiteness than those produced with kaolin. The dry films of CaCO3-filled emulsion paints had a noticeable gloss (sheen) while those of kaolin had a flat (non-glossy) appearance which was in conformity with their PVC values. The performance tests revealed the similarity of the two paint variants in scrub resistance, but better performance of the kaolin variants in opacity, settling resistance and brushing properties.

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