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Method for preparing monodispersed silver powder with high tap density and low agglomeration

A monodisperse, silver powder technology is applied in the field of preparation of monodisperse high-tapping and low-agglomeration silver powder, which can solve the problems of complex process and difficulty in industrial production, and achieve the effects of high particle sphericity, narrow particle size dispersion range and high tap density.

Inactive Publication Date: 2012-02-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-scale silver powder prepared by the inventive method has good stability and dispersibility, but the process is complicated, and industrial production has certain difficulties

Method used

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  • Method for preparing monodispersed silver powder with high tap density and low agglomeration
  • Method for preparing monodispersed silver powder with high tap density and low agglomeration
  • Method for preparing monodispersed silver powder with high tap density and low agglomeration

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Experimental program
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Effect test

Embodiment 1

[0020] For the reaction vessels, stirring paddles, etc. used, at 85°C, Na 3 PO 4 80g / L, Na 2 CO 3 120g / L, NaOH 120g / L, H 2 o 2 30ml / L solution for 15min, then rinse with deionized water.

[0021] Prepare an acidic silver salt solution, in which silver nitrate is 0.25mol / L. Prepare mixed reducing solution. L-ascorbic acid 0.13mol / L, polyethylene glycol (2000) 2.5×10 -4 mol / L and potassium nitrate 0.03g / L were prepared with deionized water to prepare a mixed reducing solution. Finally, adjust the pH of the mixed reducing solution to 1. While stirring the mixed reducing solution at a low speed, quickly mix the acidic silver salt solution and the mixed reducing solution uniformly for reaction, control the reaction temperature at 20° C., and the reaction time is 5 minutes. Post-treatment is performed on the reacted silver powder. After settling for 3 hours, the supernatant reaction solution was poured out, and then the precipitated silver powder was washed with deioniz...

Embodiment 2

[0024] For the reaction vessels, stirring paddles, etc. used, at 90°C, Na 3 PO 4 90g / L, Na 2 CO 3 100g / L, NaOH 130g / L, H 2 o 2 40ml / L solution for 20min, then rinse with deionized water.

[0025] Prepare an acidic silver salt solution, in which silver nitrate is 0.30mol / L. Prepare mixed reducing solution. L-ascorbic acid 0.18mol / L, gelatin 3.0×10 -3 mol / L and potassium carbonate 0.05g / L were prepared with deionized water to prepare a mixed reducing solution. Finally, adjust the pH of the mixed reducing solution to 0.5. While stirring the mixed reducing solution at a low speed, quickly mix the acidic silver salt solution and the mixed reducing solution evenly for reaction, control the reaction temperature at 25° C., and the reaction time is 6 minutes. Post-treatment is performed on the reacted silver powder. After 4 hours of sedimentation, the supernatant reaction solution was poured out, and then the precipitated silver powder was washed with deionized water until...

Embodiment 3

[0028] For the reaction vessels, stirring blades, etc. used, at 80°C, Na 3 PO 4 100g / L, Na 2 CO 3 130g / L, NaOH 150g / L, H 2 o 2 35ml / L solution for 25min, then rinse with deionized water.

[0029] Prepare an acidic silver salt solution, in which silver nitrate is 0.40mol / L. Prepare mixed reducing solution. 0.22 mol / L of L-ascorbic acid, 0.052 mol / L of ammonium stearate, and 0.7 g / L of potassium sulfate were prepared with deionized water to prepare a mixed reducing solution. Finally, adjust the pH of the mixed reducing solution to 0.3. While stirring the mixed reducing solution at a low speed, quickly mix the acidic silver salt solution and the mixed reducing solution uniformly for reaction, control the reaction temperature at 30° C., and the reaction time is 8 minutes. Post-treatment is performed on the reacted silver powder. After 4 hours of sedimentation, the supernatant reaction solution was poured out, and then the precipitated silver powder was washed with deio...

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Abstract

The invention relates to a method for preparing monodispersed silver powder with high tap density and low agglomeration, and the method is implemented through the following steps of uniformly mixing an acidic silver salt solution with a mixed reducing solution containing a L-ascorbic acid, a protective agent and a surfactant, and stirring the obtained mixture for reaction; and cleaning and then drying the obtained precipitate so as to obtain the monodispersed silver powder with high tap density and low agglomeration. Compared with the prior art, the silver powder prepared by using the method disclosed by the invention is high in tap density, small in particle diameter and dispersive range, high in degree of sphericity of particles, smooth in surface, small in specific surface area and easy for realization of mass production.

Description

technical field [0001] The invention relates to the technical field of silver paste for positive electrode screen printing of solar cells, in particular to a method for preparing monodisperse silver powder with high vibration and low agglomeration. Background technique [0002] Microelectronics products are trending towards miniaturization, integration and intelligence. In order to adapt to this trend, printed circuit technology is requiring finer and more precise circuits. To meet these needs, wires have become narrower and closer together. Consequently, the requirements for conductive silver pastes used in the electronics industry are getting higher and higher. Silver paste is an important material in the electronics industry, which is prepared by silver powder, resin, and organic solvent in a certain ratio. There are many factors that affect its performance, but silver powder is the most critical material to form conductive silver paste. The silver powder must be as c...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 胡晓斌宗志杰李浩然赵斌元
Owner SHANGHAI JIAO TONG UNIV
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