Preparazation of Silica Microcapsules Containing UV-Shielding Materials and Their Shielding Ability
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概要
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We prepared silica microcapsules containing various UV-shielding materials by an interfacial reaction method and investigeted their shielding ability. The silica microcapsules were made by the reaction of sodium silicate emulsified in hexane with ammonium hydrocarbonate. UV-shielding materials, 50-and 200-nm CeO<SUB>2</SUB>, TiO<SUB>2</SUB> and ZnO, were previously dispersed in the aqueous solution of sodium silicate. The UV-shielding materials were included 1-50% in the silica microcapsules, of which size was 1, 5, and 10, μm. It was proved that microcapsule containing 50-nm TiO<SUB>2</SUB> was suited for the shielding of UV range and that containing 200-nm TiO<SUB>2</SUB> for visible range. In general, the greater the content of the shielding material in microcapsule was, the greater the UV-shielding ability was. The optimum content of the shielding materials in the microcapsule for shielding ability was dependent on the particle size of the shielding materials. ThE shielding ability of 1-μm silica microcapsule was the greatest, which was close to that of TiO<SUB>2</SUB> only.
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