Preparazation of Silica Microcapsules Containing UV-Shielding Materials and Their Shielding Ability

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  • 紫外線遮蔽剤を包含するシリカマイクロカプセルの調製とその遮蔽効果
  • シガイセン シャヘイザイ オ ホウガンスル シリカ マイクロカプセル ノ チョ

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Abstract

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 CeO2, TiO2 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 TiO2 was suited for the shielding of UV range and that containing 200-nm TiO2 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 TiO2 only.

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