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A kind of preparation method of nano silver

A technology of nano-silver and nano-silver particles, which is applied in the field of nano-silver, can solve the problems of complex nano-silver preparation process and product content, and achieve the effects of ensuring particle size and stability, improving performance, and simplifying the process

Active Publication Date: 2022-04-15
CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome defects such as complex nano-silver preparation process in the prior art, and the resulting product contains a dispersant that affects conductivity, the invention provides a method for preparing nano-silver. The method uses ethyl cellulose as the main dispersant, which is easy to clean, It is convenient for mass production and preparation, can be dispersed in a variety of solvent systems, has good dispersion and stability, has good electrical properties after sintering at 300 ° C, saves costs, and is simple in process and easy to operate

Method used

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  • A kind of preparation method of nano silver

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A preparation method of nano-silver particles:

[0048] Dissolve 3 g of silver nitrate in 10 mL of deionized water;

[0049] Dissolve 0.25g of ethyl cellulose in 40mL of absolute ethanol;

[0050] Dissolve 0.8g sodium hydroxide in 5ml deionized water, add 5ml absolute ethanol after completely dissolved;

[0051] Take 12ml of 30% hydrogen peroxide and 18ml of absolute ethanol and mix well.

[0052] Under the condition of ultrasonic stirring, slowly add the silver nitrate into the ethyl cellulose ethanol solution, after mixing evenly, slowly add the sodium hydroxide solution into the mixed solution of silver nitrate and ethyl cellulose, after the addition is completed, put The hydrogen peroxide solution was slowly added dropwise to the above mixed solution, and the reaction temperature was kept at 30° C., and the reaction was stopped after 15 minutes.

[0053] Stand still until the solid-liquid separation of the reaction liquid, separate the nano-silver particles from ...

Embodiment 2

[0056] A preparation method of nano-silver particles:

[0057] Dissolve 3 g of silver nitrate in 10 mL of deionized water;

[0058] Dissolve 0.2g of ethyl cellulose and 0.05g of cetyltrimethylammonium chloride in 40mL of isopropanol solution;

[0059] Dissolve 0.75g sodium hydroxide in 5ml deionized water, add 5ml isopropanol solution after completely dissolved;

[0060] Take 12ml of 30% hydrogen peroxide and 18ml of isopropanol solution and mix well;

[0061] Under the condition of ultrasonic stirring, silver nitrate is slowly added dropwise to the isopropanol solution mixed with ethyl cellulose and cetyltrimethylammonium chloride, and after mixing evenly, the sodium hydroxide solution is slowly added dropwise to silver nitrate and In the mixed solution of ethyl cellulose and cetyltrimethylammonium chloride, after the dropwise addition is completed, slowly add the hydrogen peroxide solution dropwise into the above mixed solution, keep the reaction temperature at 30°C, and s...

Embodiment 3

[0064] A preparation method of nano-silver particles:

[0065] Dissolve 3 g of silver nitrate in 10 mL of deionized water;

[0066] Dissolve 0.2g ethylcellulose and 0.05g polyvinylpyrrolidone in 40mL absolute ethanol solution;

[0067] Dissolve 1g of sodium hydroxide in 5ml of deionized water, and add 5ml of absolute ethanol solution after completely dissolving;

[0068] Take 8ml of 70% hydrazine hydrate and 22ml of anhydrous alcohol solution and mix well;

[0069] Under the condition of ultrasonic stirring, slowly add silver nitrate dropwise to the absolute ethanol solution mixed with ethyl cellulose and polyvinylpyrrolidone, after mixing evenly, slowly add dropwise sodium hydroxide solution to silver nitrate, ethyl cellulose and polyethylene In the mixed solution of pyrrolidone, after the dropwise addition, the hydrazine hydrate solution was slowly added dropwise to the above mixed solution, and the reaction temperature was kept at 30° C., and the reaction was stopped afte...

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Abstract

Provided is a method for preparing nano silver particles, comprising the following steps: mixing a dispersant solution containing ethyl cellulose as a dispersant and a solution containing silver ions, adjusting the pH value of the solution, and controlling the reaction temperature under the condition of ultrasonic stirring A reducing agent is added dropwise to reduce and precipitate nano-silver particles, and then the nano-silver is subjected to solid-liquid separation, washing, and then freeze-drying. The method of the present invention uses a small amount of ethyl cellulose as a dispersant to coat the surface of silver particles, and ethyl cellulose itself is used as a binder and a film-forming agent in the application of electronic paste and conductive ink, which not only ensures the stability of nano silver Dispersion and stability solve the problem of solvent and silver powder demulsification and separation difficulties in the prior art (such as microemulsion method), simplify the process, reduce the cost, and improve the performance of the silver powder. The obtained nano-silver has an average particle size of 60-300nm, can be redispersed in various oily solvents, and has a solid content of up to 40%.

Description

technical field [0001] The invention generally belongs to the technical field of nano-silver, and in particular relates to a preparation method of nano-silver. Background technique [0002] Printing circuits by printing provides new ideas and solutions for the preparation of conductive patterns. The printing method has high material utilization, simple manufacturing process, and low cost. When printing circuits, it can achieve higher wiring density and accuracy. Therefore, Technologies such as inkjet printing have very broad application prospects and can be used in printing radio frequency electronic tags, solar cells, transparent conductive films and other fields. The patterns prepared by printing are finer and more favorable in terms of environmental factors and cost factors. [0003] The particle-type conductive ink commonly used in the prior art requires good dispersibility of the nanoparticles, otherwise the nozzles are easily blocked. In the preparation process of na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/0545B22F1/102B82Y40/00B82Y30/00
CPCB22F9/24B82Y40/00B82Y30/00B22F1/102B22F1/054
Inventor 马锦
Owner CHANGSHA ADVANCED MATERIALS IND RES INST CO LTD