PROCESS FOR PRODUCTION OF ALKALINE ZIRCONIA SOL

摘要

A process for producing an alkaline zirconia sol comprising a step (I) in which an alkaline zirconia sol (A) is mixed with a basic zirconium carbonate (B1), the alkaline zirconia sol (A) being produced by a process comprising a step (i) in which a zirconium salt (B2) is heated in an aqueous medium containing a quaternary ammonium carbonate at a temperature of 60 to 110°C and a step (ii) in which the resulting product is treated hydrothermally at a temperature of 110 to 250°C; more specifically, a process for producing an alkaline zirconia sol comprising a step (I) in which an alkaline zirconia sol (ZrO2) (A) is mixed with a basic zirconium carbonate (B1) at such a ratio that the solid content of the alkaline zirconium in terms of ZrO2 (As) and the solid content of the basic zirconium carbonate in terms of ZrO2 (Bs) have the following relationship: Bs/As=0.05 to 4.0 by weight and a step (II) in which a mixed solution given in the step (I) is aged at a temperature of 20 to 100°C. The process can produce an alkaline zirconia sol which is stable and has a wide range of particle size distribution.