A kind of preparation method of high tap density spherical silver powder

A technology of tap density and spherical shape, applied in the field of preparation of spherical silver powder, can solve problems such as difficult control of production conditions, and achieve the effects of safe and environmentally friendly production process, narrow particle size dispersion range and high sphericity.

Inactive Publication Date: 2018-03-16
LIYANG LIFANG PRECIOUS METALS MATERIAL CO LTD
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Problems solved by technology

The above studies all use ascorbic acid as a reducing agent, which is sensitive to changes in system acidity, concentration and temperature, and the production conditions are not easy to control

Method used

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  • A kind of preparation method of high tap density spherical silver powder

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Embodiment 1

[0028] A kind of preparation method of the spherical silver powder of high tap density, comprises the following steps:

[0029] (1) Prepare silver nitrate solution with deionized water, the concentration of silver nitrate in the solution is 1.2 mol / L;

[0030] (2) Add dropwise a sodium carbonate solution with a concentration of 1.2mol / L to the silver nitrate solution prepared in step (1), adjust the pH to 12, and stir at a speed of 80 r / min;

[0031] (3) Dissolve sodium sulfite crystals with deionized water, stir until completely dissolved, and prepare a sodium sulfite solution with a mass fraction of 10%;

[0032] (4) Dissolve rosin directly with ethanol, stir and dissolve completely, then add glycerin to obtain a mixed solution with a mass fraction of glycerol and rosin of 0.08%, wherein the mass ratio of glycerol to rosin is 1:5;

[0033] (5) Add the sodium sulfite solution in step (3) and the mixed solution in step (4) to the solution in step (2) at the same time, stir an...

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Abstract

The invention relates to a preparation method for spherical silver powder high in tap density. The preparation method comprises the following steps that (1) a silver nitrate solution with the concentration being 1-1.5 mol / L is prepared; (2) a sodium carbonate solution with the concentration being 1.2-1.6 mol / L is added into the silver nitrate solution dropwise, and the pH value is adjusted to 11-13; (3) a sodium sulfite solution with the mass fraction being 10-20% is prepared; (4) a propanetriol and rosin mixed solution with the mass fraction being 0.05-0.1% is prepared; (5) the sodium sulfite solution and the mixed solution are added into the silver nitrate solution at the same time; (6) a hydroquinone solution is added into the silver nitrate solution dropwise, and silver powder slurry is obtained; and (7) the obtained silver powder slurry is washed, filtered and dried. The spherical silver powder prepared through the preparation method is high in tap density, good in dispersion property, and small in shrinkage in the drying process and the sintering process; and the technique is simple and easy to control, the production technique is safe and environment friendly, mass production is easy, and the preparation method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to a method for preparing spherical silver powder, in particular to a method for preparing spherical silver powder with high tap density. Background technique [0002] In recent years, with the rapid development of electronic technology, the research and development of electronic materials has also experienced unprecedented development. Conductive paste is a very important branch of electronic materials, among which conductive silver paste has attracted much attention due to its many excellent properties. For example, a large amount of silver paste is used in the production of electronic components such as solar cell modules, chip (or round) ceramic capacitors, and automotive glass heating wires. The key technical indicators such as the quality of the silver paste, the conductivity and compactness after film formation are mainly determined by the performance of the ultrafine silver powder, including the shape, particle size, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 王自伟蔡璐周全法孙洪波
Owner LIYANG LIFANG PRECIOUS METALS MATERIAL CO LTD
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