METHOD FOR PRODUCING A METAL NANOPARTICLE DISPERSION, METAL NANOPARTICLE DISPERSION, AND USE OF SAID METAL NANOPARTICLE DISPERSION

摘要

The invention relates to a method for producing a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, wherein after the production of nanoscale metal particles, stabilized by means of at least one auxiliary dispersing agent containing at least one free carboxylic acid group or salt thereof as a functional group, in at least one liquid dispersant (solvent), flocculation of the metal nanoparticles is deliberately caused, the formed metal nanoparticle flocculation is dispersed again in at least one liquid dispersant, optionally by adding a base, and the metal nanoparticle dispersion is set to a desired metal nanoparticle concentration. The invention further relates to a metal nanoparticle dispersion, in particular a silver nanoparticle dispersion, in particular produced by means of the method according to the invention, and to the use of said metal nanoparticle dispersion.

主权项

1. A method for producing a metal nanoparticle dispersion comprising metal nanoparticles stabilized with at least one dispersing assistant, characterized in that
a) a metal salt, at least one dispersing assistant comprising at least one free carboxylic acid group or salt thereof as functional group, and a reducing agent, optionally in the presence of hydroxide ions, are combined in solution and reacted with one another to form stabilized metal nanoparticles; b) flocculation of the resultant metal nanoparticles is generated in the reaction mixture obtained in step a); c) the floc obtained in step b) is separated from at least part of the rest of the reaction mixture; d) the floc obtained in step c) is redispersed with addition of at least one dispersion medium, optionally with addition of a base; e) the metal nanoparticle dispersion obtained in step d) is optionally purified; and f) the desired concentration of stabilized metal nanoparticles for the metal nanoparticle dispersion obtained in step d) or e) is set.