MANUFACTURING METHOD OF NANOMETRE, MONODISPERSE AND STABLE METALLIC SILVER AND PRODUCTS OBTAINED FROM IT Russian patent published in 2011 - IPC C22B11/00 B22F9/24 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: invention refers to manufacturing method of nanoparticles of metallic silver with diameter of 1 to 100 nm and average diameter of 20 to 40 nm, which are characterised with monodispersion, stability during more than 12 months, in wide range of concentrations. Method involves preparation of water solution of silver salt, which contains 0.01 to 20 wt % of soluble silver salt; preparation of water solution of reducing agent, which contains 0.01 to 20 wt % of the compound of group of tannins; mixing of the above water solutions in order to perform the reaction between them, separation of mother solution from silver nanoparticles obtained in the above reaction. At that, the above reaction is performed by mixing those solutions and pH control in the value range of 10.5 to 11.5. Obtained particles can be repeatedly dispersed in various media, such as water, alkydal and phenol resins, cellulose nitrate, polyurethane resin, vinyl and acrylic compounds, alcohols and in many organic materials and polymers, such as high-density and low-density polyethylenes, nylon, acrylonitrile-butadiene-styrene resin and/or their mixtures.

EFFECT: obtaining nanoparticles of metallic silver, which are characterised with monodispersion, stability during more than 12 months in wide value range of concentrations.

20 cl, 5 dwg