Influence of phosphate source on preparation of zinc phosphate white pigments

International Journal of Industrial Chemistry

دوره 7، شماره 3، آذر 2016، صفحه 309-314

نوع مقاله: research article

شناسه دیجیتال (DOI): https://doi.org/10.1007/s40090-015-0067-3

نویسندگان

Hiroaki Onoda^* ؛ Miho Haruki

Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto, 606-8522, Japan

چکیده

Photocatalytically active zinc oxide is used as a white pigment for cosmetics, leading to decomposition of a certain degree of sebum on the skin upon exposure to the ultraviolet radiation in sunlight. Herein, as novel white pigments for use in cosmetics, zinc phosphates were prepared from zinc nitrate and various phosphate compounds, viz., phosphoric acid, sodium di-hydrogen phosphate, di-sodium hydrogen phosphate, sodium pyrophosphate, or sodium triphosphate. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were evaluated. The obtained materials had Zn/P ratios corresponding to those of zinc orthophosphate Zn₃(PO₄)₂, zinc pyrophosphate Zn₂P₂O₇, and zinc triphosphate Zn₅(P₃O₁₀)₂. The photocatalytic activity of these zinc phosphate particles was low; thus, these pigments should not induce decomposition of sebum on the skin. All samples prepared in this study exhibited high reflectance within the range of visible light.

کلیدواژه‌ها

White pigment؛ Zinc phosphates؛ Photocatalytic activity؛ Particle shape