Nano-silver dispersion liquid and preparation method of nano-silver dispersion liquid as well as preparation method of nano-silver antibacterial coating

Abstract

The embodiment of the invention discloses a preparation method of nano-silver dispersion liquid. The preparation method comprises the following steps that thickening agents and dispersing agents are added into pure water or deionized water, then, soluble silver salt is dissolved in solution, and the silver salt solution is obtained; and under the stirring effect, silver complexing agents are firstly added into the silver salt solution, then, reducing agents are added, or silver complexing reduction agents are directly added, the reaction is carried out for at least 12 hours under the condition of room temperature to 90 DEG C, silver ions in the silver salt solution are reduced into metal silver, the nano-silver dispersion liquid is obtained, the silver complexing agents and the silver complexing reduction agents can form the chemical bonding with the nano-silver particle surface, and in addition, functional groups with the cross linking effect are reserved. The invention correspondingly provides the nano-silver dispersion liquid prepared by the method. The process of the preparation method is simple, the stability of the prepared nano-silver dispersion liquid is good, nano-silver particles are uniform, the application is convenient, and the bonding force of the nano-silver and substrates is high. In addition, the invention also provides a preparation method of a nano-silver antibacterial coating.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a nano silver dispersion liquid and a preparation method thereof, and a preparation method of a nano silver antibacterial coating. Background technique [0002] As a substance capable of effectively sterilizing and inhibiting bacteria, nano-silver has been reported in various scientific journals and national patents on the research and development of its preparation, process, efficacy and performance. Most of the reported techniques for preparing nano-silver follow the traditional method, which is to contain silver ammonium ions [Ag(NH 3 ) 2 + ] solution, reduced by reducing agents such as aldehydes, ketones, hydrazine, sodium borohydride, etc., and self-deposited into nanometer-sized silver particles in situ. [0003] Chinese patent 200810070592 discloses "a nano-silver antibacterial solution and its preparation method", which is characterized by adding 2 times The hydrazi...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned traditional processes for preparing nano-silver generally have the following problems: (1) It is difficult to control the size and average distribution of nano-silver particles; (2) At a higher concentration, it is impossible to avoid the agglomeration of nano-silver particles, thereby shortening the storage time; (3) In industrial or civil applications, when nano-silver is coated on substrates (such as textiles, metals, ceramics, etc.), since it has no affinity with the substrate itself, additional cross-linking agents need to be added, these The cross-linking agent will partially or completely cover the surface of silver, reduce the concentration of silver on the surface, and affect the antibacterial and bactericidal effect of nano-silver

However, these additional reagents, whether by physical mixing or forming complexes with nano-silver, usually only have a single function of stabilizing the nano-dispersion, and cannot solve the problem that the nano-silver itself has no binding force with the substrate during application. The problem

Images