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A kind of preparation method of nano silver

A technology of nano-silver and silver ions, which is applied in the field of preparation of nano-silver, can solve problems such as difficulty in industrial production, complicated process, and difficult to control, and achieve the effect of inhibiting nano-silver agglomeration, simple process, and preventing agglomeration

Active Publication Date: 2016-08-24
焦作伴侣纳米材料工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-silver powder prepared by this method has good stability and dispersibility, but the output is low, the process is complex and difficult to control, and there are certain difficulties in industrial production.

Method used

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  • A kind of preparation method of nano silver
  • A kind of preparation method of nano silver
  • A kind of preparation method of nano silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of nano silver in the present embodiment, comprises the following steps:

[0032] (1) Raw material and pretreatment:

[0033] a. Preparation of silver ion-containing solution: accurately weigh soluble starch, polyvinylpyrrolidone and silver nitrate with an electronic balance, heat and dissolve the soluble starch in deionized water to a concentration of 3g / 100mL, cool to room temperature, and then add polyvinylpyrrolidone (PVP), the concentration is 10g / 100mL, after stirring and dissolving, add silver nitrate to make the silver ion concentration 0.25mol / L, stir and dissolve to obtain solution A, and store it away from light for later use;

[0034] b. Preparation of reduction solution: dissolve the weighed glucose and sodium hydroxide in deionized water to obtain solution B, wherein the concentration of glucose is 1mol / L, and the concentration of hydroxide is 2mol / L;

[0035] c. Preparation of precursor solution: Add solution B to solution A under ...

Embodiment 2

[0040] The preparation method of nano silver in the present embodiment, comprises the following steps:

[0041] (1) Raw material and pretreatment:

[0042] a. Preparation of silver ion-containing solution: accurately weigh soluble starch, polyvinylpyrrolidone and silver nitrate with an electronic balance, heat and dissolve the soluble starch in deionized water to a concentration of 2g / 100mL, cool to room temperature, and then add polyvinylpyrrolidone (PVP), the concentration is 15g / 100mL, after stirring and dissolving, add disodium ethylenediaminetetraacetate complexed silver solution to make the silver ion concentration 0.1mol / L, stir and dissolve to obtain solution A, and store it away from light for later use;

[0043] b. Preparation of reduction solution: dissolve the weighed glucose and sodium hydroxide in deionized water to obtain solution B, wherein the concentration of glucose is 1mol / L, and the concentration of hydroxide is 5mol / L;

[0044] c. Preparation of precurso...

Embodiment 3

[0048] The preparation method of nano silver in the present embodiment, comprises the following steps:

[0049] (1) Raw material and pretreatment:

[0050]a. Preparation of silver ion-containing solution: accurately weigh soluble starch, polyvinylpyrrolidone and silver nitrate with an electronic balance, heat and dissolve the soluble starch in deionized water to a concentration of 5g / 100mL, cool to room temperature, and then add polyvinylpyrrolidone (PVP), the concentration is 5g / 100mL, after stirring and dissolving, add silver nitrate to make the silver ion concentration 0.5mol / L, stir and dissolve to obtain solution A, and store it away from light for later use;

[0051] b. Preparation of reducing solution: dissolve the weighed glucose and sodium hydroxide in deionized water to obtain solution B, wherein the concentration of glucose is 1mol / L, and the concentration of hydroxide is 3mol / L;

[0052] c. Preparation of precursor solution: Add solution B to solution A under stir...

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Abstract

The invention discloses a method for preparing nano silver, and belongs to the technical field of metal nano material preparation. Environment-friendly starch and polyvinylpyrrolidone (PVP) are added in the preparing process of the nano silver, nano silver particle aggregation can be effectively prevented, the particle size can be controlled by controlling the growth speed of crystal nuclei, and accordingly nano silver powder with good dispersing performance and small particle sizes can be obtained. The PVP is used as a surface active agent and can effectively control the particle size of the nano silver, then the viscosity of a reaction solution can be improved by adding the starch, movement of silver nano particles generated in the reacting process can be limited in the reaction solution, and thus nano silver aggregation can be effectively restrained. In addition, silver nitrate or complexing silver is used as the source of silver particles, glucose is used as a reducing agent, a microwave hydrothermal method is used for replacing a traditional hydrothermal method to prepare the nano silver, so that the technology is simple, the production cycle is short, energy saving and environmental protection can be achieved, and safety performance is good.

Description

technical field [0001] The invention specifically relates to a method for preparing nano-silver, which belongs to the technical field of metal nano-material preparation. Background technique [0002] Nano-silver materials have stable physical and chemical properties, such as high thermal conductivity, high electrical conductivity and excellent optical properties, etc. widely applied. Nano-silver powders with different shapes have different properties. For example, spherical nano-silver powders with small particle size and narrow particle size distribution have good antibacterial and conductive properties. [0003] There are many ways to prepare nano-silver. In my country, physical methods and chemical reduction methods are mainly used. Among them, the physical method can obtain nano-silver powder with high purity, but has defects such as high production cost, large investment, low output, and high difficulty in industrialization, and is not suitable for the current economi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 罗成果苗保记郝建堂杜可禄冯艳艳李霞
Owner 焦作伴侣纳米材料工程有限公司