Preparation method for monodisperse spherical silver powder

A monodisperse, silver powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of process complexity and impurity residue, and achieve the effect of simple operation, less residue and good fluidity

Inactive Publication Date: 2016-10-12
ZHEJIANG TEXTILE & FASHION COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past ten years, a large number of methods for preparing silver powder have appeared, but most of them are insufficient in one or several indicators such as powder dispersibility, morphology and particle size distribution, loose / tapped density, residual impurities, and process complexity. limit its application

Method used

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  • Preparation method for monodisperse spherical silver powder
  • Preparation method for monodisperse spherical silver powder
  • Preparation method for monodisperse spherical silver powder

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1: prepare and add 80g silver nitrate in a 1 liter container, dissolve with deionized water, make the concentration of silver nitrate solution reach 100g / L. Add 50 g of ascorbic acid to another 2 liter container and dissolve with deionized water. Then add 0.5g chitosan (molecular weight 20kDa), 2.5g potassium hydrogen phthalate, stir to dissolve, add 0.1g sulfuric acid, then adjust the acidity with 45g nitric acid (mass fraction 65%), and finally add water to make 1 liter of mixture.

[0025] Heat the above two solutions to 40°C, stir for 30 minutes, quickly pour the silver nitrate solution into the reducing agent mixed solution without stirring, and keep it for 30 minutes, then filter the settled silver powder, wash it with water 4 times, and remove it with absolute ethanol. Wash twice, and dry at 50°C for 12 hours to obtain monodisperse spherical silver powder. The particle size distribution is between 1.0 micron and 4.0 micron, and the concentration is b...

Embodiment 2

[0026] Embodiment 2: prepare and add 80g silver nitrate in a 1 liter container, dissolve with deionized water, make the concentration of silver nitrate solution reach 160g / L. Add 50 g of ascorbic acid to another 2 liter container and dissolve with deionized water. Then add 1.0g chitosan (molecular weight 30kDa), 2.0g potassium hydrogen phthalate, stir to dissolve, add 0.1g sulfuric acid, then add 45g nitric acid (mass fraction 65%) to adjust the acidity, add water to make 1 liter mixture.

[0027] Heat the above two solutions to 50°C, and after stirring for 30 minutes, quickly pour the silver nitrate solution into the reducing agent mixed solution without stirring. Wash twice, and dry at 50°C for 12 hours to obtain the monodisperse spherical silver powder, with a particle size distribution of 1.0 micron to 4.0 micron, mainly concentrated in 2.0 micron to 3.0 micron, see Figure 3 to Figure 4 .

Embodiment 3

[0029] Embodiment 3: acid silver solution concentration 80g / L, ascorbic acid addition 40g, chitosan addition 0.5g (molecular weight 10kDa), potassium hydrogen phthalate addition 4g, sulfuric acid addition 0.5g, nitric acid addition (mass Fraction 65%) 40g, reaction temperature 60 ℃.

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Abstract

The invention discloses a preparation method for monodisperse spherical silver powder. The preparation method comprises the following steps: mixing a silver nitrate solution with a reducing agent solution to obtain a mixed solution; standing the mixed solution; filtering the mixed solution; cleaning the mixed solution; and drying the mixed solution. The reducing agent solution is an acidic aqueous solution of ascorbic acid; the reducing agent solution is added with chitosan and potassium hydrogen phthalate which are used as a dispersing agent, sulfuric acid which is used as a nodulizing agent and nitric acid which is used as an acid regulator. Compared with the prior art, the preparation method has the beneficial effects that: the preparation method for the monodisperse spherical silver powder is simple to operate; obtained silver powder is in a monodisperse state; silver powder particles are regularly spherical; liquidity is good; impurity content is low; and the preparation method is especially suitable for being used in the field of electronic paste.

Description

technical field [0001] The invention belongs to the field of metal powder preparation, and in particular relates to a preparation method of monodisperse spherical silver powder. Background technique [0002] Silver powder has excellent electrical conductivity and good oxidation resistance, and is one of the most widely used precious metal powders in the electronics industry. In recent years, with the continuous advancement of microelectronics technology, the electronic paste industry with silver powder as the conductive functional phase has grown rapidly, and the demand for silver powder has also reached a higher level. The preparation technology of high-quality silver powder has also become the field of electronic paste. one of the key technologies. [0003] The preparation method of silver powder can be divided into physical method and chemical method. Among many methods, the liquid phase chemical reduction method is the most widely used silver powder production method. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/065
Inventor 王尚军王瑄侯小宝王梅珍
Owner ZHEJIANG TEXTILE & FASHION COLLEGE
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