Synthesis of Transparent and Oil-Dispersible Planar Titania

  • NAKAMURA Takashi
    Noevir Co., Ltd., Shiga Central Research Laboratory
  • MURAKAMI Yasushi
    Department of Fine Materials Engineering, Faculty of Textile Science and Technology, Shinshu University
  • TAKASU Yoshio
    Department of Fine Materials Engineering, Faculty of Textile Science and Technology, Shinshu University

Bibliographic Information

Other Title
  • オイル分散型薄片状透明酸化チタンの合成
  • オイル分散型簿片状透明酸化チタンの合成
  • オイル ブンサンガタボヘンジョウ トウメイ サンカ チタン ノ ゴウセイ

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Description

A new oil-dispersible planar titania (OD-TiO) with a lateral size in the range of O. 5 to 200/1 n was synthesized by the catalytic sol-gel process in oil phase. Titanium tetraethoxide was pretreated with isostearic acid to be dispersed in oil phase before the reaction. Sodium stearate was used as a catalyst for the titania formation in oil phase. The formation reaction proceeded very slowly without any catalyst because only a little amount of water, as another reactant, was included in the oil. OD-TiO exhibited both a high transparency and a high absorbance of UVB. The sun protection facter (SPF) of the dispersion of OD-Ti0 (30 wt%) in oil was 16, in spite of the high transparency. The UV protection ability was enhanced when commercially available fine TiO2 particle was added. The safety of OD-TiO was confirmed to be at the same level of the surface-coated fine Ti02 particle by a biological test.

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