Method for preparing ultrafine silver powder with uniform particle size

A technology with uniform particle size, applied in the field of preparation of ultra-fine silver powder with uniform particle size, can solve the problems of low process efficiency, difficulty in large-scale production, uneven particle size distribution of silver powder, etc., and achieve high particle sphericity and particle size dispersion range Narrow, smooth surface effect

Inactive Publication Date: 2013-04-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the particle size distribution of the silver powder is uneven, and the process efficiency is low, making it difficult to achieve large-scale production

Method used

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  • Method for preparing ultrafine silver powder with uniform particle size
  • Method for preparing ultrafine silver powder with uniform particle size

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] All reaction containers and stirring rods used should be boiled in a solution of 150g / L NaOH and 50ml / L H2O2 for 15 minutes at 75°C. Fully hydroxylate the surface of the reactor to avoid silver mirrors during the reaction. The cleaned reactor should be washed with deionized water. Prepare silver ammonia solution, wherein silver nitrate 34g / L, ethylenediamine solution 24.04g / L. Prepare mixed reducing solution, potassium tartrate 26g / L, gum arabic 2g / L, nano-gold colloid 2g / L and deionized water to prepare mixed reducing solution 500mL. Under the condition of a constant temperature water bath, the silver ethylenediamine ammonia solution and the mixed reducing solution were uniformly mixed for reaction, the reaction temperature was controlled at 70° C., and the reaction time was 10 minutes. Transfer the reacted solution to another clean beaker, let it settle for 12 hours, pour off the supernatant, then wash the precipitated silver powder with deionized water until the co...

Embodiment 2

[0022] All reaction containers, glass rods, etc. used should be boiled in a solution of 150g / L NaOH and 50ml / L H2O2 for 10 minutes at 80°C. Fully hydroxylate the surface of the reactor to avoid silver mirrors during the reaction. The cleaned reactor should be washed with deionized water. Prepare silver ethylenediamine ammonia solution, in which silver nitrate is 42.5g / L and ethylenediamine is 30.05g / L. Prepare mixed reducing solution, potassium tartrate 32.5g / L, gum arabic 2.5g / L, nano-gold colloid 2.5g / L and deionized water to prepare 500mL mixed reducing solution. Under the condition of a constant temperature water bath, the silver ammonia solution and the mixed reducing solution were uniformly mixed for reaction, the reaction temperature was controlled at 40° C., and the reaction time was 30 minutes. Transfer the reacted solution to another clean beaker, let it settle for 12 hours, pour off the supernatant reaction solution, then wash the precipitated silver powder with d...

Embodiment 3

[0025] All reaction containers and stirring paddles should be boiled in a solution of 175g / L NaOH and 50ml / L H2O2 for 10 minutes at 82°C. Fully hydroxylate the surface of the reactor to avoid silver mirrors during the reaction. The cleaned reactor should be washed with deionized water. Prepare silver ethylenediamine ammonia solution, in which silver nitrate is 37.4g / L and ethylenediamine is 26.5g / L. Prepare mixed reducing solution. Potassium tartrate 28.6g / L, gum arabic 2.2g / L, nano gold glue 2.2g / L were prepared with deionized water to prepare 500mL mixed reducing solution. In a constant temperature water bath, the silver ammonia solution and the mixed reducing solution are uniformly mixed for reaction, and the reaction temperature is controlled at 35° C. and the reaction time is 60 minutes. Post-treatment is performed on the reacted silver powder. After 12 hours of sedimentation, the supernatant reaction solution was poured out, and then the precipitated silver powder wa...

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Abstract

The invention relates to a method for preparing ultrafine silver powder with a uniform particle size. The method comprises the following steps of: uniformly mixing and reacting silver-nitrate-ethidene-diamine mixed liquid and mixed reduction liquid which contains potassium tartrate, a protective agent and a stabilizing agent; and washing and drying the obtained precipitation so as to obtain the ultrafine spherical silver powder with the uniform particle size. Compared with the prior art, the method has the advantages that: the obtained silver powder is high in tap density and narrow in particle size dispersion range; and the particle of the obtained silver powder is spherical, the grain size is micro, the specific surface area is small and the method is easy for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of fine silver powder of solar cell anode silver paste, in particular to a preparation method of ultrafine silver powder with uniform particle size. Background technique [0002] Silver powder is an important precious metal powder, which is widely used in catalysts, antibacterial materials, medical materials, electronic pastes and other fields. Among them, the application of silver powder in electronic paste attracts the most attention. Due to the good conductivity of metallic silver, silver can be the main raw material for making electronic paste and conductive layer. With the rapid development of my country's electronics industry and the widespread popularization of solar cells as a new energy source, the demand potential of silver powder market getting bigger. The morphology and particle size distribution of silver powder determine its efficiency as a conductive layer. [0003] The main methods for pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 胡晓斌陈冉延阳宗志杰王新赵斌元
Owner SHANGHAI JIAO TONG UNIV
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