| 摘要 |
PURPOSE:To prepare sol of superfine particles of crystalline anatase type titanium oxide by forming gel by the reaction of a water-soluble Ti compd. with an ammonium compd. treating the gel hydrothermally at above a specified temp., and adding an acid thereto. CONSTITUTION:After forming gel by the reaction of a water-soluble Ti compd. (e.g. TiCl4 etc.) with an ammonium compd. (e.g. aq. soln. of ammonium bicarbonate, etc.), the gel is treated hydrothermally at >=100 deg.C, and adding an acid (e.g. HNO3, etc.) to prepare sol of crystalline titanium oxide. The crystalline titanium oxide has anatase-type crystal shape providing <=500Angstrom extremely fine colloidal particle in the state of aq. soln. forming stable sol. The sol improves chemical resistance and water resistance remarkably as compared to the effect of conventional amorphous coating materials when it is used for matting of chemical fibers, synthetic fibers, etc., or for coating paper, permitting the use of the fibers or paper under wide range of using condition.
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