A kind of method for preparing nano-silver 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: 2017-07-14
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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  • A kind of method for preparing nano-silver powder in batches
  • A kind of method for preparing nano-silver powder in batches
  • A kind of method for preparing nano-silver 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 add to the above solution with a metering pump Slowly add 8L dropwise to the concentration of 5×10 -3 mol / L ascorbic acid aqueous solution, the rate of addition is 0.2mL / min; then, use a metering pump to quickly drop 15L of 0.2mol / L ascorbic acid solution in the above solution, the rate of addition is 10mL / min, and continue to stir for 0.5h after the drop is complete. 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 mix...

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 aqueous maltose solution at a rate of 0.05mL / min; then, use a micropipette to quickly inject 8.75L of maltose aqueous solution with a concentration of 0.12mol / L at a rate of 60mL / min, 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 solut...

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 sodium hypophosphite aqueous solution, the dropping rate is 0.4mL / min; then, quickly drop 4.17L sodium hypophosphite aqueous solution with a concentration of 0.12mol / L with a metering pump, the dropping rate is 20mL / min, and continue to stir 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 circulation pump and pi...

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Abstract

The invention provides a method for preparing nano-silver powder in batches, which belongs to the field of nano-material preparation. The present invention adopts a two-step method to synthesize nano-silver particles. First, slowly drop a low-concentration reducing agent solution into the mixed solution of silver salt, protective agent and pH regulator, and then quickly drop a high-concentration reducing agent solution to obtain nano-silver Mixed solution; the above-mentioned nano-silver mixed solution is passed through a membrane separation device to remove impurities to obtain a nano-silver dispersion; finally, add absolute ethanol and a polymer dispersant to the nano-silver dispersion, and use spray drying equipment to spray dry to obtain a certain Nano-silver powder with a particle size; the particle size of the nano-silver powder prepared by the present invention is controllable and stable in batches, which solves the problems of uneven particle size during nano-silver synthesis, agglomeration and agglomeration during nano-silver separation and powder making; and the preparation process operation It is simple and can realize industrialization and mass production.

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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Patent Type & Authority Patents(China)
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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