PRODUCTION OF SODIUM HEXATITANATE LUMPY POWDER PARTICLE AND COSMETIC RAW MATERIAL USING SODIUM HEXATITANATE LUMPY POWDER PARTICLE

摘要

PROBLEM TO BE SOLVED: To improve the skin touch feel by firing and pulverizing a dry powder obtained by forming a slurry from a hydrate cake obtained by allowing titanium dioxide hydrate to react with sodium hydroxide under a specific condition, neutralizing, aging, filtering, washing and drying. ;SOLUTION: The hydrate cake is obtained by adding sodium hydroxide into the titanium dioxide hydrate obtained by hydrolyzing titanyl sulfate or titanium chloride in a ratio by weight of 1-3 expressed in terms of NaOH/TiO₂, filtering and washing. The dry powder is obtained by adding hydrochloric acid into the slurry obtained by adding water to the hydrate cake and having ≤200 g/L concentration expressed in terms of TiO₂ to neutralize to pH 6.0-9.0, heating 70-90°C, aging for ≥1 hr, filtering, washing and drying. The dry powder is fired at 650-750°C for 4-16 hr and pulverized to obtain the sodium hexatitanate lumpy particle having 0.1-1 μm, preferably 0.3-0.5 μm average particle diameter and average aspect ratio of 1.0-3.5.;COPYRIGHT: (C)1999,JPO