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Preparation method for food-grade small-grain-size nano-silver sol

A nano silver sol, small particle size technology, applied in nanotechnology and other directions, can solve the problems of difficult to eliminate harmful anions of nano silver glue, large particle size of nano silver glue, poor bactericidal performance, etc., to achieve high dispersion performance, bactericidal ability The effect of strong and stable dispersion performance

Inactive Publication Date: 2017-05-31
苏州沐恩包装新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nano-silver colloids prepared by conventional methods generally have large particle sizes and poor dispersion, so the bactericidal performance is poor; more importantly, due to the use of silver compounds as raw materials, it is difficult to eliminate harmful anions in nano-silver colloids by general processes. , which greatly restricts its application in the fields of human body, paper, fiber, etc.

Method used

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  • Preparation method for food-grade small-grain-size nano-silver sol
  • Preparation method for food-grade small-grain-size nano-silver sol
  • Preparation method for food-grade small-grain-size nano-silver sol

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Effect test

Embodiment 1

[0017] First, silver nitrate and water are mixed according to the requirement that the silver content in the solution is 20pm, sodium octadecyl sulfate or sodium stearate is added to the silver nitrate solution, and the mixed solution is stirred for 10 minutes, then, the obtained The mixed solution is subjected to an aging reaction, specifically, after irradiating with a light source containing ultraviolet rays for 30 minutes, a nano-silver sol with a particle size of 2 nanometers can be obtained.

Embodiment 2

[0019] First, silver nitrate and water are mixed according to the requirement that the silver content in the solution is 100pm, sodium octadecyl sulfate or sodium stearate is added to the silver nitrate solution, and di-octyl succinate sulfonic acid is added to the solution Sodium (AOT) replaces the harmful negative ions in the solution, and stirs the mixed solution for 15 minutes, then, the obtained mixed solution is subjected to an aging reaction, specifically, the particle size can be obtained after irradiating with a light source containing ultraviolet rays for 2 hours Nano silver sol with a small particle size of 2 nanometers.

Embodiment 3

[0021] First, mix silver nitrate and water according to the requirement that the silver content in the solution is 10000pm, add sodium octadecyl sulfate or sodium stearate into the silver nitrate solution, and then add di-octyl succinate sulfonic acid into the solution Sodium (AOT) replaces the harmful negative ions in the solution, and stirs the mixed solution for 20 minutes. Then, the obtained mixed solution is subjected to an aging reaction. Specifically, the particle size can be obtained after irradiating with a light source containing ultraviolet light for 24 hours. Be 2 nanometers small diameter nano-silver sol, make the TEM result of nano-silver as follows figure 1 As shown, the particle size distribution is as figure 2 As shown, the antibacterial test results are as follows image 3 shown.

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Abstract

The invention discloses a preparation method for good-grade small-grain-size nano-silver sol. According to the specific technical scheme, the method comprises the following steps that firstly, silver nitrate and water are blended according to the requirement that the silver content in a solution is 20-10000 pm, a surfactant is added into the silver nitrate solution to prepare a blended solution which is then stirred for 10-30 minutes, in the step, the surfactant is added for overcoming the defect that due to the small grain size and mutual attraction, a nano material is extremely prone to form a soft agglomerate which is extremely hard to disperse,; and secondly, the blended solution obtained in the first step is subjected to curing reaction, specifically, a light source containing ultraviolet light is utilized for irradiating the blended solution for 30 minutes to 24 hours, and then the small-grain-size nano-silver sol with the average grain size being 2 nm can be obtained.

Description

technical field [0001] The invention belongs to the technical field of nanometer metal sol, and in particular relates to the preparation of a food-grade nanometer silver sol with small particle diameter. Background technique [0002] The use of antimicrobial agents to inhibit or kill harmful bacteria is an important means to improve human health and environmental sanitation. The research and development of antibacterial agents and their products has become one of the new hotspots in the field of scientific research. Commonly used antibacterial agents include natural antibacterial agents, organic antibacterial agents and inorganic antibacterial agents. The variety of natural antibacterial agents is limited and the utilization rate is low; organic antibacterial agents not only have toxic and side effects, but also have problems such as poor heat resistance, easy decomposition, and short service life; and inorganic antibacterial agents have broad-spectrum antibacterial propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30B82Y40/00
CPCB22F9/30B82Y40/00
Inventor 陈敬锋李勇
Owner 苏州沐恩包装新材料有限公司
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