Mixing ratio of zinc nitrate and phosphoric acid for preparation of zinc phosphate white pigments

Cerâmica

H. Onoda¹  M. Haruki¹ 

[1] ,Kyoto Prefectural University Department of Informatics and Environmental Sciences Kyoto,Japan

关键词: white pigment;    zinc phosphates;    Zn/P ratio;    photocatalytic activity;    particle shape;    pigmento branco;    fosfatos de zinco;    proporção Zn/P;    atividade catalítica;    forma da partícula;   

DOI  :  10.1590/S0366-69132014000300010

来源: SciELO

【 摘 要 】

In this work, zinc phosphates were prepared from zinc nitrate and phosphoric acid at various Zn/P ratios 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. Samples prepared at Zn/P = 2/1, 3/2, and 1/1 indicated XRD pattern of Zn3(PO4)2•4H2O. The plane particles were observed in SEM images of sample prepared at Zn/P = 2/1, 3/2 and 1/1. The photocatalytic activity of these zinc phosphate particles was too less to protect the sebum on the skin. The materials prepared at Zn/P = 2/1, 3/2 and 1/1 and their thermal products at 100 °C showed a high reflectance within the range of visible light. Samples prepared at high Zn/P ratio indicated small MIU value.

【 授权许可】

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