Nano-silver sol antibacterial agent and preparation method thereof

A technology of nano-silver sol and antibacterial agent, which is applied in the field of nano-silver sol antibacterial agent and its preparation, and can solve the problems of affecting antibacterial effect, restricting research and application, and losing nano-characteristics of nano-silver particles

Active Publication Date: 2013-04-17
GUANGDONG INST OF MICROBIOLOGY GUANGDONG DETECTION CENT OF MICROBIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, under normal conditions without protective agent, nano-silver particles are prone to agglomeration and lose nano-characterist...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 10.2 mg of silver nitrate, dissolve it in 5 ml of deionized water, add ammonia water, adjust the pH to 10, and adjust the volume of deionized water to 10 ml, that is, the silver ion concentration is 0.006 mol / l to obtain silver ammonium solution. 10.6 mg of ascorbic acid and 10.6 mg of PVP were weighed and dissolved in 10 ml of deionized water to obtain a reducing agent and protecting agent solution. Add the reducing agent and protective agent solution dropwise to the silver ammonium solution through a burette at room temperature. During the addition process, the silver ammonium solution is at 40°C and 100 rpm, and the rate of addition is controlled to be fast first and then slow. After the mixing reaction, the mixed The solution was ultrasonicated for 10 minutes in an ice bath with an output power of 190W. Finally, the sol that had completed the reaction was filtered through a filter membrane to obtain a clear, colorless and transparent nano-silver sol antibacteri...

Embodiment 2

[0016] Weigh 0.51g of silver nitrate, dissolve it in 25ml of deionized water, add ammonia water, adjust the pH to 10, and adjust the volume of deionized water to 50ml, so that the concentration of silver ions is 0.06mol / l, to obtain a silver ammonium solution. Weigh 2 g of ascorbic acid and 1 g of PVP and dissolve them in 50 ml of deionized water to obtain a reducing agent and protecting agent solution. Add the reducing agent and protective agent solution dropwise to the silver ammonium solution through a burette at room temperature. During the addition process, the silver ammonium solution is at 20°C and 200rpm, and the rate of addition is controlled to be fast first and then slow. After the mixing reaction, the mixed The solution was ultrasonicated for 10 min in an ice bath with an output power of 200W. Finally, the mixed solution after the reaction is filtered through a filter membrane to obtain a clear, colorless and transparent nano-silver sol antibacterial agent.

[001...

Embodiment 3

[0019] Weigh 0.102g of silver nitrate, dissolve it in 15ml of deionized water, add ammonia water, adjust the pH to 10.5, and adjust the volume of deionized water to 30ml, so that the concentration of silver ions is 0.02mol / l, to prepare the silver ammonium solution. Weigh 0.5 g of ascorbic acid and 0.4 g of PVP and dissolve them in 60 ml of deionized water to obtain a reducing agent and protecting agent solution. Add the reducing agent and protective agent solution dropwise to the silver ammonium solution through a burette at room temperature. During the addition process, the silver ammonium solution is at 30°C and 150rpm, and the dropping speed is controlled to be fast first and then slow. After the mixing reaction, the mixed The solution was ultrasonicated for 5 min in an ice bath with an output power of 200W. Finally, the reaction-completed mixed solution is filtered through a filter membrane to obtain a clear, colorless and transparent nano-silver sol antibacterial agent. ...

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Abstract

The invention discloses a nano-silver sol antibacterial agent and a preparation method thereof. The preparation method includes the steps: dissolving silver nitrate in water, adding ammonia water, adjusting pH (potential of hydrogen) to be 10+/-0.5 and adjusting the concentration of Ag+ to range from 0.006mol/l to 0.1mol/l to prepare silver ammonium solution; dissolving a reducing agent and a protective agent in the water to obtain reducing agent and protective agent solution; and slowly adding the reducing agent and protective agent solution into the silver ammonium solution according to the volume ratio of 1:1-5 of the reducing agent and protective agent solution to the silver ammonium solution when the silver ammonium solution is at 20-40 DEG C and 100-200rpm, performing ultrasonic operation for mixed solution for 5-20min under the condition of ice-bath after mixed reaction, and finally filtering the mixed solution to obtain colorless and transparent nano-silver sol antibacterial agent. In the silver ammonium solution, the quantity relative ratio of n (the reducing agent) to n (Ag+) is 1-5:1, the mass ratio of the n (the reducing agent to m (the protective agent) is 1-2:1, and output power is 150-200w. The nano-silver sol antibacterial agent can avoid agglomeration of nano-silver particles in long-term storage and use process.

Description

technical field [0001] The invention belongs to the field of preparation of antibacterial agents, and in particular relates to a nano-silver sol antibacterial agent with high efficiency, environmental protection and no agglomeration phenomenon and a preparation method thereof. Background of the invention [0002] With the extensive use of chemical drugs such as antibiotics, disinfectants, and fungicides, the population of microbial mutations caused by drug resistance is increasing, and global microbial disasters caused by microorganisms and their variants occur frequently. In order to prevent the occurrence of these malignant events that endanger human health, the research and development of new antibacterial materials are urgently needed. Due to its excellent antibacterial properties, nano silver is known as a new generation of antibacterial agents in the 21st century. It has a broad application market and can be used in the field of daily necessities (various fabrics, clot...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00A01N59/16A01P1/00B82Y40/00B82Y30/00
Inventor 李文茹施庆珊欧阳友生陈仪本冯劲陈爱美
Owner GUANGDONG INST OF MICROBIOLOGY GUANGDONG DETECTION CENT OF MICROBIOLOGY
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