Nano-silver and preparation method and application

Abstract

The invention discloses nano-silver and a preparation method and application. The preparation method comprises the following steps of S1, preparing a water reaction system containing silver ions; preparing a dispersing agent solution system; preparing a solution containing a reducing agent, mixing the solution containing the dispersing agent and the water reaction system containing the silver ions, adjusting a PH value, controlling the reaction temperature under an ultrasonic stirring condition, and dropping the reducing agent for reduction preparation of nano-silver particles; S2, washing the prepared nano-silver particles through ceramic membrane equipment, cleaning and separating the prepared nano-silver particles through centrifugal separation, and then freeze-drying. The nano-silver particles are prepared through a reduction reaction, the nano-silver particles are washed through a ceramic membrane and penetrate through membrane holes in the ceramic membrane, so that the nano-silver particles have good dispersity and uniformity, meanwhile, residual organic impurities on the surface of the nano-silver are effectively removed through centrifugal separation, and the prepared nano-silver is high in purity.

Description

technical field [0001] The invention relates to the field of preparation of nano-silver, in particular to a nano-silver and its preparation method and application, which are used in ink-jet printing conductive inks of different solvent systems. Background technique [0002] Printing circuits by printing provides new ideas and solutions for the preparation of conductive patterns. The printing method has high material utilization, simple manufacturing process, and low cost. When printing circuits, it can achieve higher wiring density and accuracy. Therefore, Technologies such as inkjet printing have very broad application prospects and can be used in printing radio frequency electronic tags, solar cells, transparent conductive films and other fields. The patterns prepared by printing are finer and more favorable in terms of environmental factors and cost factors. [0003] The particle-type conductive ink commonly used in the prior art requires the particle size of nanoparticl...

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Problems solved by technology

[0003] The particle type conductive ink commonly used in the prior art requires that the particle size of nanoparticles be controlled within 100nm, and requires good dispersion, otherwise it is easy to block the nozzle. Therefore, silver-based conductive inks are usually used in large quantities during the preparation of nano-silver Polyvinylpyrrolidone, cetyl ammonium bromide, polyvinyl alcohol and other polymers are used to maintain the dispersion of nano-silver. These polymers are wrapped on the surface of nano-silver to affect the conductivity of the printed conductive layer, increase the resistivity, and It is extremely difficult to treat the nano-silver surface to a satisfactory effect

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