Patent ID: 9126839
Filing Date: 2015-09-08
Classification: A01N,A61K,C01B

Abstract:
1. A method of manufacturing silica nanopowders with fungicidal properties, by the sol-gel method, comprising: forming and mixing an aqueous reaction mixture comprising tetraalkoxysilane and an ammonium compound, wherein the tetraalkoxysilane comprises an alkoxy group that contains from C1 to C4 carbon atoms, alcohol or a mixture of aliphatic C1 to C4 alcohols in a mol ratio of from 1:5 to 1:35, and wherein the ammonium compound is used in an amount of from 0.001 to 0.05 mol per 1 mol of tetraalkokxysilane; adding a carbo-functional alkoxysilane and a thermodegradable copper(II) salt in the form of an aqueous solution to the aqueous reaction mixture, wherein the thermodegradable copper(II) salt has a decomposition temperature and is added in an amount of 0.0015-0.095 mol per 1 mol of tetraalkokxysilane, and wherein the carbo-functional alkoxysilane is added in an amount of 0.015-1 mol per 1 mol of thermodegradable copper(II) salt; mixing the aqueous reaction mixture; drying the aqueous reaction mixture to evaporate solvents and form a dry residue; and heating the dry residue at a temperature of at least 250° C. to decompose the thermodegradable copper(II) salt and form nanopowders with fungicidal properties containing immobilized nanometric copper particles.