PRODUCTION OF ZINC FLAKE

• Main Authors: MARUYAMA HIRONORI, WATANABE YOSHIHARU, TAKAKURA GUNJI, HAGA SANSHIROU, SANETOU KOUICHI, HIRABAYASHI KENICHI
• Format: Patent
• Language: English
• Published: 20.05.1985
• Subjects: ADHESIVES; CASTING; CHEMISTRY; DYES; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PERFORMING OPERATIONS; POLISHES; POWDER METALLURGY; PREPARATION OF CARBON BLACK; TRANSPORTING; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; WORKING METALLIC POWDER

PURPOSE:To produce easily flaky zinc powder for paint by grinding Zn powder to flakes by means of a ball mill or the like by using a specific org. assistant for grinding then heating the flakes in a non-oxidative atmosphere to remove the assistant for grinding. CONSTITUTION:Flaky Zn powder is used as a raw material for a zinc rich paint for rust prevention of iron and steel. A higher fatty acid such as stearic acid, oleic acid, lauric acid or the like or metallic salt such as Ca salt, Zn salt, Al salt, etc. thereof is used as an assistant for grinding and the above-mentioned powder is ground by a ball mill, stamp mill, etc. to obtain the flat flaky powder having <=100mu max. length, 1.5-30mu average long diameter, <=5mu average thickness and >=3 ratio between the long diameter/thickness. Such powder is heated in a non-oxidative atmosphere such as H2, Ne, Ar, etc. to remove the assistant for grinding, by which the flaky Zn powder for paint contg. <=0.5wt% remaining assistant for grinding is obtd.