METHOD OF MANUFACTURING SILVER POWDER BY CHEMICAL REDUCTION

摘要

The present invention relates to a method for producing spherical silver powder having excellent dispersibility and narrow particle size distribution suitable for high precision and high reliability conductive pastes used for forming electrodes of electronic components such as chip capacitors, ceramic capacitors, and PDPs. .;First, the present invention provides a method for preparing monodisperse spherical silver powder by dissolving sodium borohydride as a reducing agent and adding gelatin as a dispersant, and mixing the solution with a solution containing silver nitrate. . Second, using a solution made by dissolving hydrazine as a reducing agent and gelatin as a dispersant, and mixing the solution with a solution containing silver oxide prepared from silver nitrate and sodium hydroxide to prepare monodisperse spherical silver powder. To provide.;According to the present invention, the spherical silver powder can be easily produced by the above chemical reduction method, and the silver powder obtained by narrowing the particle size distribution of the silver powder obtained can be obtained narrowly. In addition, according to the present invention, the production process of the silver powder is simple, it is possible to manufacture at room temperature, it is possible to produce a very excellent silver powder in terms of efficiency and productivity.;Chemical reduction, spherical, silver powder, monodisperse, sodium borohydride, hydrazine. gelatin