Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Dry Grinding on a Pigment Mixture. I. The Effect of α-Copper Phthalocyanine as a Lubricant on the Mechanochemical Transformation of Calcium Carbonate
Norimichi KawashimaKenjiro Meguro
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1975 Volume 48 Issue 6 Pages 1857-1861

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Abstract

α-Copper phthalocyanine and calcium carbonate were mixed and ground with a grinder, and then the surface properties of the mixtures were investigated in comparison with the grinding time by means of X-ray diffraction analysis, electron-micrograph observation, and the specific surface area as obtained by the B.E.T. method. In the grinding process, the crystal decays of both α-copper phthalocyanine and calcium carbonate were observed. Particularly, the calcite-aragonite transformation occurred in the case of calcium carbonate. However, the addition of some α-copper phthalocyanine to calcium carbonate interfered with the transformation of calcium carbonate. As a conclusion, it was evident that the surface of calcium carbonate was covered with α-copper phthalocyanine and that the grinding of calcium carbonate was interfered with by the lubricating action of α-copper phthalocyanine.

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