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Journal of Advanced Ceramics 2015, 4(4): 312-317 https://doi.org/10.1007/s40145-015-0167-8
Research Article | Open Access | Issue | Published: 02 December 2015

Effect of mechanical treatment on the powder properties of zinc phosphate white pigments

Show Author's Information Hiroaki ONODA( ),  Miho HARUKI
Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan
Keywords:
photocatalytic activity, white pigment, zinc phosphate, mechanical treatment, water retention
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ONODA H, HARUKI M. Effect of mechanical treatment on the powder properties of zinc phosphate white pigments. Journal of Advanced Ceramics, 2015, 4(4): 312-317. https://doi.org/10.1007/s40145-015-0167-8
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Abstract Full text About this article

Zinc oxide, which has photocatalytic activity, is used as a white pigment for cosmetics, resulting in a certain amount of sebum on the skin to be decomposed by the ultraviolet radiation in the sunlight. In this work, zinc phosphates as novel white pigments for use in cosmetics were prepared from zinc nitrate and sodium dihydrogen phosphate, and then ball-milled under various conditions. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were studied. The zinc phosphate particle size was decreased by mechanical treatment. In particular, the sample treated with sodium lactate solution had much smaller particles. The milled zinc phosphates exhibited less photocatalytic activity than zinc oxide, and thus should not decompose sebum on the skin. The milled zinc phosphates showed sufficiently high reflectance within the range of visible light to act as novel white pigments. The sample treated with sodium lactate solution had higher water retention than the sample treated with water. Further, the slip resistance and roughness of the powder particles decreased as a result of treatment with sodium lactate solution.


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About this article

Effect of mechanical treatment on the powder properties of zinc phosphate white pigments

Show Author's information Hiroaki ONODA( ), Miho HARUKI
Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan

Abstract

Zinc oxide, which has photocatalytic activity, is used as a white pigment for cosmetics, resulting in a certain amount of sebum on the skin to be decomposed by the ultraviolet radiation in the sunlight. In this work, zinc phosphates as novel white pigments for use in cosmetics were prepared from zinc nitrate and sodium dihydrogen phosphate, and then ball-milled under various conditions. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were studied. The zinc phosphate particle size was decreased by mechanical treatment. In particular, the sample treated with sodium lactate solution had much smaller particles. The milled zinc phosphates exhibited less photocatalytic activity than zinc oxide, and thus should not decompose sebum on the skin. The milled zinc phosphates showed sufficiently high reflectance within the range of visible light to act as novel white pigments. The sample treated with sodium lactate solution had higher water retention than the sample treated with water. Further, the slip resistance and roughness of the powder particles decreased as a result of treatment with sodium lactate solution.

Keywords: photocatalytic activity, white pigment, zinc phosphate, mechanical treatment, water retention

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Publication history
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Publication history

Received: 13 May 2015
Revised: 03 August 2015
Accepted: 12 August 2015
Published: 02 December 2015
Issue date: April 2015

Copyright

© The author(s) 2015

Acknowledgements

The support of this work by The Cosmetology Research Foundation is gratefully acknowledged. The authors are grateful to Dr. Takeshi Toyama, Nihon University, Japan, for the smoothness measurements.

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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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