Method for preparing high-dispersibility and high-sphericity superfine silver powder on large scale

A high-sphericity, high-dispersion technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of uneven particle size distribution of silver powder, inability to mass-produce, cumbersome reaction process, etc.

Inactive Publication Date: 2018-02-06
KUNMING INST OF PRECIOUS METALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above-mentioned method for preparing silver powder or the reaction process is cumbersome, the reaction time is long, and the product agglomeration is serious; or the reagents used are not environmentally friendly; or the particle size distribution of the obtained silver powder is not uniform, and the sphericity is not high; Large-scale production, so it cannot be industrially applied to the current electronic paste field

Method used

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  • Method for preparing high-dispersibility and high-sphericity superfine silver powder on large scale
  • Method for preparing high-dispersibility and high-sphericity superfine silver powder on large scale
  • Method for preparing high-dispersibility and high-sphericity superfine silver powder on large scale

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) 100g silver nitrate is dissolved in 100mL deionized water to make silver nitrate solution, and the concentrated ammonia water that massfraction is 25% is added dropwise to the solution to make its solution pH 9 to obtain solution A;

[0030] (2) 110g ascorbic acid is dissolved in 100mL deionized water to make ascorbic acid solution, and the concentrated ammonia water that massfraction is 25% is added dropwise to the solution to make its solution pH 9 to obtain mixed solution B;

[0031] (3) dissolving 10 g of sodium polyacrylate in 200 mL of deionized water to obtain a sodium polyacrylate solution, and adding 25% concentrated ammonia in mass fraction to the solution to make the solution pH 9 to obtain mixed solution C;

[0032] (4) The mixed solution C is equally divided into two parts by volume, and at room temperature, it is added to the mixed solution A and the mixed solution B, respectively, to obtain the mixed solution D and E;

[0033] (5) at room temperature,...

Embodiment 2

[0037] On the basis of Example 1, it is only necessary to change steps (1), (2) and (3) to: add concentrated ammonia water with a mass fraction of 25% dropwise to the solution to make the pH of the solution 10, and the rest The steps are carried out according to Example 1. products such as Figure 2a and Figure 2b As shown, the average particle size of the spherical silver powder is 1.5 μm, and the measured tap is 4.11 g / cm 3 , the burning loss is 0.5%.

Embodiment 3

[0039] On the basis of Example 1, only steps (1), (2) and (3) need to be changed to: add 25% concentrated ammonia water dropwise to the solution to make the solution pH 11, and the rest The steps are carried out according to Example 1. products such as Figure 3a and Figure 3b As shown, the average particle size of the spherical silver powder is 1.8 μm, and the measured tap is 4.03 g / cm 3 , the burning loss is 0.6%.

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Abstract

The invention provides a method for preparing a high-dispersibility and high-sphericity superfine silver powder on a large scale. The method is characterized in that the silver powder is prepared by taking water as a solvent, synthesizing a silver-salt alkaline solution precursor at first, adequately mixing a surfactant aqueous solution (used as an auxiliary morphology modifier) in the silver-saltalkaline solution and an ascorbic acid solution (used as a reducer), and reacting through an alkaline solution (used as a main morphology modifier). The high-dispersibility, high-compaction, low-burning-loss and high-sphericity superfine silver is obtained in one step through adjusting reaction parameters. The preparation method provided by the invention is simple and convenient to operate, low in reaction cost, high in silver powder yield, high in repeatability, applicable to large-scale industrialized production, and especially suitable for silver paste for electric contact materials and plasma display electrodes.

Description

technical field [0001] The invention relates to a method for preparing high-dispersion and high-sphericity ultra-fine silver powder in large quantities, in particular to the preparation of micron-level ultra-fine spherical silver powder by a liquid-phase reduction method, which can be directly applied to the large-scale production of electronic paste and microelectronic components. It belongs to the field of preparation of precious metal ultrafine silver powder. technical background [0002] Ultrafine silver powder is widely used in the field of electronic paste, mainly used in the preparation of solar electrodes, electromagnetic wave shielding, flexible circuits and other electronic components, and its preparation methods and performance research have received great attention. In order to obtain silver powder with ideal morphology and excellent performance, researchers at home and abroad have done a lot of work. The methods for preparing silver powder are mainly mechanical ...

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 杨宏伟郭帅龙方卫
Owner KUNMING INST OF PRECIOUS METALS
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