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Method for preparing nanosilver powder in batches

A technology of nano-silver powder and mass production, which is applied in the direction of nano-technology, can solve the problems of nano-silver agglomeration, agglomeration, and uneven particle size of nano-silver, and achieve the effect of increased surface area, uniform distribution of crystal seeds, and controllable quantity

Active Publication Date: 2015-09-23
NANO TOP ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a new method for synthesizing, separating and preparing nano-silver powder in batches. The particle size of the nano-silver powder prepared by the present invention is controllable and stable in batches. The problems of agglomeration and agglomeration during the separation and powder making of nano-silver; and the preparation process is simple to operate, which can realize industrialization and mass production

Method used

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  • Method for preparing nanosilver powder in batches
  • Method for preparing nanosilver powder in batches
  • Method for preparing nanosilver powder in batches

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The preparation flow chart of nano-silver powder is attached figure 1 :

[0038] (1) Weigh 150g of dimethylaminomethacrylamide / acrylic acid copolymer and dissolve it in 40L of dewatered water, then add 1020g of silver nitrate to dissolve, adjust pH=9 with 4% mass fraction of dilute ammonia water, and use a metering pump to add to the above solution Slowly add 8L dropwise to the concentration of 5×10 -3 mol / L ascorbic acid aqueous solution, the dropping rate is 0.2mL / min; then, quickly add 15L of 0.2mol / L ascorbic acid aqueous solution dropwise to the above solution with a metering pump, the dropping rate is 10mL / min, continue to stir for 0.5h after dropping, Obtain nano-silver mixed solution;

[0039] (2) the nano-silver mixed solution that step (1) obtains is passed through membrane separation equipment (see attached figure 2) for membrane separation, the ultrafiltration membrane material is polyacrylonitrile, and the membrane pore size is 30nm. Pour the mixed sol...

Embodiment 2

[0043] The preparation flow chart of nano-silver powder is attached figure 1 :

[0044] (1) Weigh 150g of polyacrylic acid (PAA) and dissolve it in 50L of deionized water, then add 340g of silver nitrate and stir until dissolved, and slowly inject 80mL of it into the above solution with a micropipette at a concentration of 8×10 -3 mol / L maltose aqueous solution at a rate of 0.05mL / min; then, quickly inject 8.75L of maltose aqueous solution with a concentration of 0.12mol / L at a rate of 60mL / min with a micropipette, and continue stirring for 1h to obtain nano-silver mixture;

[0045] (2) the nano-silver mixed solution that step (1) obtains is passed through membrane separation equipment (see attached figure 2 ) for membrane separation, the ultrafiltration membrane material is polystyrene, and the membrane pore size is 50nm. Pour the mixed solution into the material tank, then add deionized water, turn on the circulation pump and pipeline valve, the nano-silver mixed solutio...

Embodiment 3

[0049] The preparation flow chart of nano-silver powder is attached figure 1 :

[0050] (1) Weigh 300g polyvinyl alcohol and dissolve it in 20L deionized water, then add 340g silver sulfate and stir until dissolved, slowly add 0.5L dropwise to the solution with a metering pump at a concentration of 1×10 -3 mol / L aqueous solution of sodium hypophosphite at a rate of 0.4mL / min; then, use a metering pump to quickly add 4.17L aqueous solution of sodium hypophosphite with a concentration of 0.12mol / L at a rate of 20mL / min, and continue stirring for 1.5h , to obtain nano-silver mixed solution;

[0051] (2) the nano-silver mixed solution that step (1) obtains is passed through membrane separation equipment (see attached figure 2 ) for membrane separation, the ultrafiltration membrane material is polyvinyl chloride, and the ultrafiltration membrane pore size is 40nm; pour the mixed solution into the material tank, then add deionized water, open the circulating pump and pipeline val...

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Abstract

The invention provides a method for preparing nanosilver powder in batches, belonging to the field of nano-material preparation. Nanosilver particles are synthetized in two steps, at first, a low-concentration reducing agent solution is slowly added into a solution mixed with silver salt, a protective agent, and a pH conditioning agent drop by drop, and then a high-concentration reducing agent solution is rapidly added drop by drop to obtain a nanosilver mixed solution; impurities in the nanosilver mixed solution are removed through a membrane separation device to obtain a nanosilver dispersion liquid; and at the end, absolute ethyl alcohol and a high-molecular dispersant are added into the nanosilver dispersion liquid, and spray drying is carried out by a spray drying device to obtain nanosilver powder in a certain particle size. The particle size of the prepared nanosilver powder is controllable, the batches are stable, the problems of non-uniform particle size during the synthesis of nanosilver, nanosilver separation, and agglomeration and acaking during powder preparation are solved, the preparation process and the operation are simple, and industrial and batches production is realized.

Description

technical field [0001] The invention relates to a method for preparing nano silver powder, in particular to a method for preparing nano silver powder in batches, and belongs to the field of nano material preparation. Background technique [0002] With the gradual development of electronic equipment in the direction of small size, light weight, low cost, multiple functions, and high reliability, it is of great practical significance to develop and produce nano-silver powder and nano-silver paste. Nano-silver powder has small particle size, low sintering temperature, good fluidity and uniformity, and the surface area of ​​nano-silver powder is large, which increases the contact area of ​​silver powder. Therefore, nano-silver conductive paste has good conductivity and is widely used as an electrode. Slurry filler. Nano-silver paste will play an important role in processes such as solar cell cathode materials, fine printed circuits, ultra-narrow wiring of electronic devices, ul...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
Inventor 翟金玲杜克诚刘明轩代攀吴丽娟宋延林
Owner NANO TOP ELECTRONICS TECH
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