SILICA USED AS MATTING AGENT FOR COATING MATERIAL AND PRODUCTION THEREOF

摘要

PURPOSE: To produce the silica excellent in tranparecy and jet-blackness. ;CONSTITUTION: The silica having the total vol. of micropores with diameters of 20-3,000Å of 1.5cc/g or higher, a ratio of the total vol. of micropores with diameters of 100-3,000Å to the total vol. of all the micropores of 50% or higher, and a ratio of the total vol. of micropores with diameters of 300Å or higher to the total vol. of all the micropores of 20% or higher is produced by dropping an alkali metal silicate together with sulfuric acid to simultaneously cause neutralization to thereby produce a silica slurry contg. silica with a BET specific surface area of 500m²/g or higher, subjecting the slurry to hydrothermal synthesis, and drying and simultaneously grinding the resulting precipitated silica in a jet mill using hot air or superheated steam.;COPYRIGHT: (C)1995,JPO