Micron-sized spherical silver powder and preparation method thereof

A micron-scale, spherical technology, applied to conductive materials dispersed in non-conductive inorganic materials, photovoltaic power generation, etc., can solve the problems of limiting the preparation of efficient conductive silver paste, poor sphericity and size control of silver powder, etc., to achieve a good surface Shape, reduce production cost, simple operation effect

Active Publication Date: 2021-11-05
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the poor sphericity and size control of silver powder will also limit the preparation of high-efficiency conductive silver paste to a certain extent.

Method used

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  • Micron-sized spherical silver powder and preparation method thereof
  • Micron-sized spherical silver powder and preparation method thereof
  • Micron-sized spherical silver powder and preparation method thereof

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preparation example Construction

[0032] A preparation method of micron-scale spherical silver powder, comprising the following steps:

[0033] S1, preparing a silver nitrate solution, adding trisodium citrate to the silver nitrate solution and mixing to obtain a precursor solution;

[0034] S2, preparing an ascorbic acid solution, adding gum arabic, polyvinylpyrrolidone and polyethylene glycol to the ascorbic acid solution to obtain a reducing agent solution;

[0035] S3, under the condition of 20-60° C. and protected from light, quickly pour the precursor solution into the reducing agent solution, and keep stirring until the reaction is completed, and the micron-sized spherical silver powder is obtained.

[0036] The principle of this preparation method is: add trisodium citrate to the silver nitrate solution, the citrate root combines with silver ions to form a deposition salt, and then gradually releases silver ions during the reaction process, thereby reducing the reaction rate and better controlling the ...

Embodiment 1

[0047] (1) Preparation of silver solution A: first prepare a silver nitrate solution with a molar concentration of 0.118mol / L in a 50ml beaker, then add trisodium citrate with a silver nitrate mass ratio of 250:3 to obtain a silver-containing solution A;

[0048] (2) in the beaker of 50ml, prepare molar concentration and be the ascorbic acid solution of 0.114mol / L, add respectively the acacia gum (AG) that is 8% with respect to silver nitrate mass ratio, 2% polyvinylpyrrolidone (PVP, MW=58000 ) and 2% polyethylene glycol 4000 (PEG-4000), to obtain solution B;

[0049](3) In the case of continuous magnetic stirring, the silver solution prepared in step (1) is poured into the reducing agent solution B at a speed of 12.5ml / s. After the addition, the magnetic stirring is continued for 10min, and the stirring The speed is 500r / min, and the whole process is kept at room temperature and protected from light. After the reaction, the silver colloid solution was placed in an ultrasoni...

Embodiment 2

[0051] (1) Preparation of silver solution A: first prepare a silver nitrate solution with a molar concentration of 0.118mol / L in a 50ml beaker, then add trisodium citrate with a mass ratio of 250:3 to silver nitrate to obtain a silver-containing solution A;

[0052] (2) Preparation of reducing agent solution B: in a 50ml beaker, prepare a molar concentration of 0.114mol / L ascorbic acid solution, add respectively gum arabic (AG) and 2.5% polyvinylpyrrolidone relative to silver nitrate mass ratio (PVP, MW=58000) and 1.8% polyethylene glycol 4000 (PEG-4000) to obtain solution B;

[0053] (3) In the case of continuous magnetic stirring, the silver solution prepared in step (1) is poured into the reducing agent solution B at a speed of 12.5ml / s. After the addition, the magnetic stirring is continued for 10min, and the stirring The speed is 500r / min, and the whole process is kept at room temperature and protected from light. After the reaction, the silver colloid solution was plac...

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Abstract

The invention provides a preparation method of micron-sized spherical silver powder. The preparation method comprises the following steps: S1, preparing a silver nitrate solution, adding trisodium citrate into the silver nitrate solution, and uniformly mixing to obtain a precursor solution; S2, preparing an ascorbic acid solution, and adding Arabic gum, polyvinylpyrrolidone and polyethylene glycol into the ascorbic acid solution to obtain a reducing agent solution; and S3, at the temperature of 20-60 DEG C and under the dark condition, rapidly pouring the precursor solution into the reducing agent solution, conducting continuous stirring till the reaction is completed, and obtaining the micron-sized spherical silver powder. The silver powder is high in sphericity degree and free of irregular shapes such as flakes and dendrites.

Description

technical field [0001] The invention relates to a micron-sized spherical silver powder and a preparation method thereof, belonging to the technical field of silver powder preparation. Background technique [0002] Silver powder has been widely used in conductive silver paste, optical devices and catalysis due to its unique electrical, optical, catalytic and thermal properties. [0003] At present, most of the existing silver powders are spherical particles, dendritic or other irregular and complex shapes. Such irregular morphology of silver powder will reduce the leveling and density of silver paste printing, thereby reducing the density of the electrode after sintering and increasing the electrode resistance. At the same time, the poor sphericity and size control of silver powder will also limit the preparation of high-efficiency conductive silver paste to a certain extent. Contents of the invention [0004] The invention provides a micron-sized spherical silver powder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00H01B1/16
CPCB22F9/24H01B1/16Y02E10/50
Inventor 徐进叶慧
Owner XIAMEN UNIV
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