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A kind of nano-silver concentrate and its preparation method

A concentrated liquid and nano-silver technology, applied in the field of nano-silver, can solve the problems of difficult to meet the use, waste of resources, high cost, etc., and achieve the effect of promoting dispersion and stability, reducing usage, and ensuring stability

Active Publication Date: 2021-09-17
TAIYUAN HYPERION NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many advantages such as simple operation, low equipment cost, and relatively concentrated particle size distribution. However, the primary product of chemical preparation is silver sol, and the aggregation tendency of silver particles in the colloid increases with the increase of its content. It is carried out at a low concentration, which causes inconvenience to industrial production; at the same time, due to the use of a large amount of solvents and the low yield of active ingredients in the low-concentration preparation process, problems such as high cost, waste of resources, and non-environmental protection are caused.
[0005] The yield of prior art preparation nano-silver concentrate is low, and cost is high; Nano-silver concentrate is not easy to preserve for a long time, must be made into nano-powder as soon as possible; A large amount of raw materials are used in the process, and the preparation cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The invention provides a kind of preparation method of nano-silver concentrate, comprising:

[0027] dissolving the silver source and the dispersant in a solvent to obtain a solution;

[0028] The solution is reacted with a reducing agent to obtain a concentrated solution of nanometer silver.

[0029] In the present invention, the mass concentration of the silver source in the solution is preferably 5-15%, more preferably 7-12%, most preferably 9-10%.

[0030] In the present invention, the silver source is preferably one or more of silver nitrate, silver sulfate, silver acetate, silver carbonate, silver chloride and silver complexes, more preferably silver nitrate, silver sulfate and silver chloride One or more of silver.

[0031] In the present invention, the solvent is preferably one or more of alcoholic solvents and aqueous solvents, more preferably one or more of ethanol, methanol, ethylene glycol, glycerol and water.

[0032] In the present invention, the mass c...

Embodiment 1

[0048]Configuration 100mL, mass concentration is 25% silver nitrate aqueous solution; Add 200mL mass concentration and be the ethanol solution of 20% polyvinylpyrrolidone, mix and stir the solution; Add 25mL of methylamine to the mixed solution and stir, and The agitated material was transferred to a hydrothermal reaction kettle, stirred and heated in an oil bath at 150°C, and stirred for about 20 hours to react. The pressure of the reaction was controlled to be 10MPa, and the obtained reaction product was completely cooled and then taken out to obtain a nano-silver concentrate.

[0049] The nano-silver concentrate prepared in Example 1 of the present invention is centrifuged, and the separated precipitate is collected and weighed to obtain the mass of nano-silver in the nano-silver concentrate. Calculate the mass of nano-silver obtained in Example 1 of the present invention. The concentration and yield of the nano-silver concentrate are calculated as follows: the mass concentr...

Embodiment 2

[0053] Configure 100mL of silver nitrate aqueous solution with a mass concentration of 27%; add 200mL of an ethanol solution of polyvinylpyrrolidone with a mass concentration of 25%, and mix and stir the solution; add 30mL of ethylenediamine into the mixed solution and stir. Transfer the stirred material to a hydrothermal reaction kettle, stir and heat in an oil bath at 170°C, stir for about 10 hours to react, control the reaction pressure to 10MPa, and take out the obtained reaction product after complete cooling to obtain nano-silver concentrate.

[0054] According to the method of Example 1, the mass concentration of the nano-silver concentrate prepared in Example 2 of the present invention was 5.5%, and the yield was 92%.

[0055] Test the nano-silver concentrate prepared by the embodiment of the present invention 2 according to the method of embodiment 1, the particle size of nano-silver in the nano-silver concentrate prepared by the embodiment of the present invention 2 i...

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Abstract

The invention provides a method for preparing a nano-silver concentrate, comprising: dissolving a silver source and a dispersant in a solvent to obtain a solution; reacting the solution with a reducing agent to obtain a nano-silver concentrate. The reaction principle of the present invention is that the silver source is reduced to simple silver by amine substances under the condition of high temperature and high pressure, and nano silver particles are produced under the action of the dispersant. The present invention uses a high-concentration amine substance as a reducing agent while using a high-concentration silver source as a reactant. In the reaction system, the amine substance has a high concentration, and the silver source used at the same time has a relatively high concentration, so it can effectively reduce The use amount of the solution in the reaction process increases the yield and obtains a high-concentration nano-silver concentrate. The nano-silver concentrate prepared by the method provided by the invention has the characteristics of high concentration, high yield, low cost, resource saving, environmental protection and high efficiency.

Description

technical field [0001] The invention relates to the technical field of nano-silver, in particular to a nano-silver concentrate and a preparation method. Background technique [0002] Nano-silver has the properties of conventional nano-materials. As a noble metal nano-material, it also has good optical, electrical, and catalytic properties. It can be widely used in electronics, antibacterial materials, and catalysis. [0003] The preparation methods of nano-silver powder are divided into two categories: physical method and chemical method. Physical methods such as vacuum condensation method are used to prepare nano-silver powder. , to vaporize the silver raw material or form a plasma, and then quench it to condense it to obtain nano-silver particles. This method requires expensive equipment and high technical requirements for equipment. The equipment independently developed in China cannot accurately control the particle size to the nanometer level. Usually, micron silver po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F2009/245B22F1/054
Inventor 黄翟
Owner TAIYUAN HYPERION NEW MATERIAL CO LTD