Nano silver preparation process

Abstract

The invention provides a nano silver preparation process, which is characterized by comprising the following steps: A. dissolving silver salt and a protective agent into a water soluble solvent or an alcohol solvent; B. adjusting the pH value into a needed range; C. adding a reducer to the obtained mixed solution, and heating and stirring for reacting for 20-30 minutes; and D. finally obtaining golden yellow nano silver solution. Compared with the prior art, the nano silver obtained by the preparation process of the invention is degradable, nontoxic and harmless to people and livestock, environmental friendly and soluble in water and most of organic matters totally, wherein, the particle size of the obtained nano silver product is less than 10nm and the complete reaction rate of silver ions is more than 99.99%. The nano silver preparation process has the advantages of simplicity, simple manufacturing equipment, low cost, food-grade raw materials and no any emissions and environmental pollution in the whole preparation course.

Description

technical field [0001] The invention relates to a preparation process of nano silver. Background technique [0002] At present, there are many methods for preparing nano-silver, including physical methods, chemical methods and biological reduction methods. Physical methods mainly include sputtering plating, mechanical ball milling and laser ablation. The principle of the physical method is simple, and the obtained product has less impurities and high quality. Its disadvantages are high requirements for equipment and high production costs. It is mainly suitable for industrial production that does not require high requirements on the size and shape of nano-silver particles. Chemical methods include microemulsion method, sol-gel method, electroplating method, liquid phase chemical reduction method, photochemical reduction method, etc., but the formulation cost of these chemical methods is relatively high, the preparation process is complicated, and it is not easy to produce on...

AI Technical Summary

Problems solved by technology

The principle of the physical method is simple, and the obtained product has less impurities and high quality. Its disadvantages are high requirements for equipment and high production costs. It is mainly suitable for industrial production that does not require high size and shape of nano-silver particles.

Chemical methods include microemulsion method, sol-gel method, electroplating method, liquid phase chemical reduction method, photochemical reduction method, etc., but the formulation cost of these chemical methods is relatively high, the preparation process is complicated, and it is not easy to produce on a large scale. The quality of the product is unstable, the reaction of silver ions is incomplete, and most of them cannot be degraded, which limits its application and promotion