Process for preparing nano silver colloidal water solution

Abstract

The present invention relates to the preparation process of nano silver colloidal water solution. By means of double injection controlling technology and under the stirring with the stirrer, argentamine and reductant aqua are injected simultaneously into the reaction system containing protecting agent aqua to generate nano silver particle, and through ultrafiltering to desalt, nano silver colloidal water solution with average size smaller than 50 nm is obtained. Thus obtained nano silver colloidal water solution is stable, good in dispersion, small and homogeneous in size, and the preparation process is automatic, short in production period, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing an aqueous solution of nano-silver colloid. Background technique [0002] Silver has been used for thousands of years. By the 1930s, a variety of silver elements and compounds were used for antibacterial treatment. A large number of studies have found that the use of silver in antibacterial treatment has many advantages such as non-toxic, non-allergic, non-drug resistance, and no cross-drug interference. Organisms, which have respiratory enzymes to keep them alive, the silver meets the respiratory enzymes and binds to them, causing the bacteria to die. Compared with ordinary silver, the bactericidal ability of silver in the nano state has produced a qualitative leap. Only a very small amount of nano silver can produce a strong bactericidal effect. It is widely used in environmental protection, textile clothing, fruit preservation, food hygiene, and beauty. Can be widely used. [0003] Chinese patent CN...

AI Technical Summary

Problems solved by technology

The single-injection dripping method usually adopts the method of slow dripping to realize the low concentration of the reactants to participate in the reaction. Although this reduces the concentration of one of the reactants to a certain extent, it cannot make the two reactants at a low concentration at the same time. reaction, the growth rate of particles cannot be reduced to the greatest extent, and there is a lack of corresponding supporting devices to assist in solving the problem of reactant concentration, which eventually leads to larger particles with wider distribution

The single injection dripping method makes the production cycle longer and is not suitable for industrial production; and in the above preparation method, due to the lack of corresponding desalination treatment process, the reaction by-products and redundant ions cannot be removed, which restricts the molding of the product. It affects the stability and dispersibility of the product, and further improvement is needed in the preparation process and preparation equipment