ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 58, (2) 151 - 156 (2014)


MIXING RATIO OF ZINC CHLORIDE AND PHOSPHORIC ACID, AND ADDITION OF SODIUM LACTATE FOR PREPARATION OF ZINC PHOSPHATE WHITE PIGMENTS
 
Onoda Hiroaki, Haruki Miho
 
Department of Informatics and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cyo, Sakyo-ku, Kyoto 606-8522, Japan

Keywords: White pigment, Zinc phosphates, Zn/P ratio, Photocatalytic activity, Particle shape
 

In this work, zinc phosphates were prepared from zinc chloride and phosphoric acid at various Zn/P ratios with / without sodium lactate as a novel white pigment for use in cosmetics. The chemical composition, powder properties, photocatalytic activity, color phase, moisture retention, and smoothness of the zinc phosphates were studied. All samples indicated XRD pattern of Zn3(PO4)2∙4H2O. The plane parts on particles were observed in SEM images of sample prepared at Zn/P = 3/2 with sodium lactate and samples prepared at Zn/P = 1/1. The photocatalytic activity of these zinc phosphate particles was too less to protect the sebum on the skin. The materials obtained and their thermal products at 100oC showed a high reflectance within the range of visible light. The slipping resistance of the powder decreased as a result of the addition of sodium lactate.


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