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Method for preparing novel large-scale oil-soluble nano silver

A large-scale, nano-silver technology, applied in the field of preparation of oil-soluble nano-silver, can solve the problems of poor redispersibility, large product particle size, and many process steps, and achieve high stability, short reaction time, and low process cost Effect

Inactive Publication Date: 2011-06-22
SHANGHAI LANGYI FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many process steps, the product particle size is large, and the redispersibility is poor, so it is difficult to meet the requirements of modern industry.

Method used

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  • Method for preparing novel large-scale oil-soluble nano silver
  • Method for preparing novel large-scale oil-soluble nano silver

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1: Dissolve 0.01 mol of silver acetate in 100 ml of ethanol, add 5 ml of oleic acid and 0.5 g of polyethylene glycol 2000, stir to dissolve, and heat up to 50 degrees. Slowly add 10ml of hydrazine hydrate solution, stir vigorously, the solution gradually turns dark yellow, indicating the formation of nano-silver, and stop heating after 20 minutes. The cooled solution is left to stand and then centrifuged, and repeatedly washed with deionized water, ethanol and acetone for more than three times to obtain nano silver with high purity, good stability and good oil solubility.

example 2

[0023] Example 2: Dissolve 0.01 mol of silver nitrate in 100 ml of diethylene glycol, add 0.5 g of cetyltrimethylammonium bromide and 0.8 g of polyvinyl alcohol 30 g, and heat up to 100 degrees. Dissolve 0.02mol of sodium hypophosphite in 50ml of diethylene glycol, slowly add to the above solution and stir vigorously, the solution turns purple, indicating that nano-silver is generated, and stop heating after 20 minutes. Subsequent operations are the same as in Example 1.

example 3

[0024] Example 3: Dissolve 0.01 mol of silver nitrate in 100 ml of ethylene glycol, add 0.6 g of dodecyltrimethylammonium chloride and 2 g of hexadecane, and raise the temperature to 60 degrees. Dissolve 0.01mol sodium borohydride in 50ml ethylene glycol, slowly add to the above solution and stir vigorously, the solution gradually turns yellow, indicating that nano-copper is formed, and the reaction stops after 20 minutes. Subsequent operations are the same as in Example 1.

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Abstract

The invention discloses a method for preparing novel large-scale oil-soluble nano silver. The method comprises the following steps of: completely dissolving silver salt and an organic protective agent into a solvent; gradually heating the solution to 20 to 70 DEG C; after the temperature is stabilized, adding a reducing agent into a reaction system; reacting for 20 to 30 minutes continuously under stirring; gradually cooling; standing and centrifuging the cooled solution; and washing sequentially with ethanol, deionized water and acetone for multiple times repeatedly to obtain the stable nano silver. The method is simple in process, simple and convenient in operation, mild in reaction, short in reaction time, high in efficiency and suitable for large-scale production; the product has high properties; the grain diameter of the nano silver is less than 20 nm; the nano silver has high secondary dispersibility in various oil agents; preparation cost and energy consumption are low; no harmful waste is generated; and the modernized production requirements, namely 'green production, environmental friendliness and energy conservation' are met.

Description

Technical field [0001] The invention relates to a method for preparing oil-soluble nano-silver, in particular to a method for preparing oil-soluble nano-silver which has good dispersibility in oily solvents and is suitable for large-scale production. Background technique [0002] Since the 1980s, nanotechnology has shown wide application potential in materials, information, energy, environment, life, military, manufacturing, etc., bringing huge opportunities for the development of high-tech and the improvement of human living standards in the 21st century. In the 19th century, countries around the world seized the high-tech and key strategic areas of the commanding heights of the global economy. [0003] As a member of the nanomaterial family, nano-silver exhibits many excellent properties. The outstanding electrical, optical, antibacterial and catalytic functions make nano silver widely recognized in the fields of electronics industry, antibacterial materials, organic cata...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 唐晓峰赵宏鑫杨振国
Owner SHANGHAI LANGYI FUNCTIONAL MATERIALS
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