Method for preparing ultrafine silver powder

A technology of ultra-fine silver and silver nitrate, which is applied in the field of preparation of new material ultra-fine powder, can solve the problems of single silver powder oxidant, silver powder particle size and particle size distribution are difficult to control, etc., to achieve large-scale production, good dispersion, easy-to-achieve effects

Active Publication Date: 2017-12-12
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of single oxidant in the preparation of silver powder by the current chemical reduction method, the particle size and particle size distribution of the silver powder are difficult to control, etc., the present invention provides a method for preparing ultra-fine silver powder with simple preparation process and low production cost

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  • Method for preparing ultrafine silver powder

Examples

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Embodiment 1

[0043] A method for preparing ultrafine silver powder, specifically comprising the steps of:

[0044] (1) Weigh 0.05mol silver nitrate and dissolve it in 1000mL water to prepare a silver nitrate solution with a concentration of 0.05mol / L, and place it in an ultrasonic generator in a constant temperature water bath at 20°C, with an ultrasonic frequency of 25KHz, combined with a mechanical stirring paddle at a stirring speed of 400r / L min, add 1.25g Tween 80 to the silver nitrate solution to make it disperse evenly, then add dropwise a sodium chloride solution with a concentration of 0.2mol / L at a speed of 1mL / min until no white precipitate is separated out, and obtain Silver chloride colloid;

[0045] (2) adjust the pH value of silver chloride colloid in step (1) with dilute hydrochloric acid to be 1;

[0046] (3) Dissolve 0.06mol of ascorbic acid and 0.25g of Tween 80 in 50mL of water, stir continuously to disperse them evenly, and obtain a reducing solution;

[0047] (4) Ad...

Embodiment 2

[0052] A method for preparing ultrafine silver powder, specifically comprising the steps of:

[0053] (1) Weigh 0.09mol silver nitrate and dissolve it in 260mL water to prepare a silver nitrate solution with a concentration of 0.35mol / L, and place it in a constant temperature water bath ultrasonic generator at 35°C with an ultrasonic frequency of 40KHz and a stirring speed of 800r with a mechanical stirring paddle / min, add 1.8g Tween 80 to the silver nitrate solution to make it evenly disperse, and then dropwise add a sodium chloride solution with a concentration of 0.5mol / L at a speed of 1mL / min until no white precipitate is separated out to obtain Silver chloride suspension;

[0054] (2) adjust the pH value of the silver chloride suspension in step (1) with dilute hydrochloric acid to be 1;

[0055] (3) Dissolve 0.18mol of ascorbic acid and 0.4g of Tween 80 in 100mL of water, and keep stirring to disperse evenly to obtain a reducing solution;

[0056] (4) Add the reducing...

Embodiment 3

[0061] A method for preparing ultrafine silver powder, specifically comprising the steps of:

[0062] (1) Weigh 0.3mol silver nitrate and dissolve it in 2000mL water to prepare a silver nitrate solution with a concentration of 0.15mol / L, and place it in a constant temperature water bath ultrasonic generator at 50°C with an ultrasonic frequency of 60KHz and a stirring speed of 600r with a mechanical stirring paddle / min, add 0.53g sodium dodecylbenzene sulfonate and 1g polyvinylpyrrolidone to make it dissolve, and then drop dilute hydrochloric acid with a concentration of 0.6mol / L at a speed of 1mL / min until there is no more White precipitate is separated out, and silver chloride colloid is obtained;

[0063] (2) Adjust the pH value of the silver chloride colloid in step (1) with dilute sodium hydroxide solution to make pH=2;

[0064] (3) Dissolve 0.3mol of ascorbic acid and 1.1g of Tween 80 in 100mL of water, stir continuously to disperse evenly, and obtain a reducing solutio...

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Abstract

The invention discloses a method for preparing ultrafine silver powder. The method comprises the steps that silver nitrate is firstly utilized for preparing and obtaining silver chloride colloid or suspension liquid, after the pH value is adjusted, ascorbic acid and a dispersing agent are added, a sodium hydroxide or potassium hydroxide solution is added dropwise under the ultrasonic and mechanical dispersion combined effect, and finally the high-purity ultrafine silver powder can be obtained through solid-liquid separation, washing, drying and screening. The silver powder obtained through the method is spherical or near spherical, the average grain diameter ranges from 0.5 micrometer to 3 micrometers, grain size distribution is narrow, and purity is high; and the process is based on the chemical reduction method principle, the production cost is low, operation is simple, the reaction is controllable, and the silver powder high in purity, narrow in grain size distribution, good in dispersity and capable of being used as electronic slurry is obtained and can be applied to industrial production.

Description

technical field [0001] The invention relates to a method for preparing ultrafine silver powder, which belongs to the technical field of preparation of new material ultrafine powder. Background technique [0002] The progress of industrialization has improved our living standards, but it has also seriously polluted the natural environment we depend on for survival. The over-extraction of resources has caused the earth to face the depletion of non-renewable energy sources, and the growth of population has increased the consumption of energy. People pay more and more attention to the development and utilization of new energy, and the efficient use of solar energy has become a research hotspot in recent decades. Photovoltaic power generation is a clean way of using solar energy, which has developed rapidly in recent years, and has entered the practical stage on a large scale, and has formed a huge industrial chain. [0003] At present, the solar cell silver paste in the market ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 苏绍晶冯旭胡劲王玉天
Owner KUNMING UNIV OF SCI & TECH
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