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Preparation method for high-dispersing silver powder used for conductive silver paste

A technology of conductive silver paste and high dispersion, which is applied in the field of preparation of highly dispersed silver powder, which can solve the problems of affecting the dispersion of conductive paste and the inability to ensure good dispersion of silver powder particles, and achieve uniform particle size, high purity and simple process Effect

Inactive Publication Date: 2009-11-04
CHINA LUCKY FILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional dispersants cannot ensure good dispersion of silver powder particles, especially after the silver powder is wash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 15g silver nitrate and dissolve it in 200ml deionized water to make silver nitrate solution A; weigh 18g ascorbic acid and dissolve it in 200ml deionized water to make reducing agent solution B; weigh 0.5g Solsperse27000 (produced by Lubrizol) and dissolve it to 400ml Prepare hyperdispersant solution C in deionized water; raise the temperature of liquid C to 30°C, adjust the stirring speed to 400rpm; inject liquid A and liquid B into liquid C, and control the injection speed to 25ml / min. Stirring was continued for 20 min while maintaining the temperature at 30 °C. Use a centrifuge to separate the solid from the liquid. Washing with deionized water and acetone three times respectively, after solid-liquid separation, the silver powder was vacuum-dried at 60°C to obtain 1 # silver dust.

Embodiment 2

[0035] Take by weighing 16g silver nitrate and dissolve in 150ml deionized water, be mixed with silver nitrate solution A; Take by weighing 30g ammonium formate and dissolve in 150ml deionized water, be mixed with reducing agent solution B; Take by weighing 0.9g Solsperse20000 (produced by Lubrizol company) and dissolve into Prepare hyperdispersant solution C in 400ml of deionized water; raise the temperature of solution C to 40°C, adjust the stirring speed to 300rpm; inject solution A and solution B into solution C at a constant speed, and keep it constant; adjust the injection speed to 30ml / min; continue to maintain for 30min after the injection is completed; use a centrifuge to separate the solid from the liquid. Washed three times with deionized water and acetone respectively, and after solid-liquid separation, the silver powder was vacuum-dried at 60°C to obtain 2 # silver dust.

Embodiment 3

[0037] Take by weighing 10g silver nitrate and dissolve it in 150ml deionized water to make silver nitrate solution A; take by weighing 13g ascorbic acid and dissolve it in 150ml deionized water to make reducing agent solution B; take by weighing 0.8g CH-10 (Shanghai Sanzheng Polymer Material Produced by the company) was dissolved in 350ml of deionized water to prepare hyperdispersant solution C; adjust the stirring speed of solution C to 300rpm; raise the temperature to 25°C at the same time and keep it constant; inject solution A and solution B into C and mix In the liquid, adjust the injection speed to 30ml / min; keep it for 30min after the injection is completed; use a centrifuge to separate the solid from the liquid. Washed three times with deionized water and acetone, and after solid-liquid separation, the silver powder was vacuum-dried at 60°C to obtain 3# silver dust.

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Abstract

The invention relates to a preparation method for high-dispersing silver powder used for conductive silver paste. Silver nitrate solution and reducer are added into hyper-dispersant solution at the same time under stirring, and the high-dispersing silver powder with different particle diameters from 0.1 to 5.0 mum is obtained by regulating stirring rate and reaction time under the condition of keeping the reaction temperature and pH value of the reaction system unchanged. The method has simple technology; the obtained silver powder has the advantages of high purity, uniform particle diameter, good dispersity and compatibility with macromolecule resin in subsequent procedures, and can be used for preparing conducting coating, conducting paint, conducting resin, and the like.

Description

technical field [0001] The invention relates to a preparation method of silver powder, in particular to a preparation method of highly dispersed silver powder for preparing conductive silver paste. Background technique [0002] Metal silver powder itself has excellent catalytic properties, magnetic properties, electrical properties, etc., so it has more and more applications in aerospace, atomic energy, electronics, powder metallurgy, chemical and other industries, as well as medical and biological engineering. Silver powder and its electronic paste series products are the most widely used and the largest amount of precious metal powder in the electronics industry, and are the basic and key functional materials for the production of various electronic components. Electronic paste products integrate metallurgy, chemical industry, and electronic technology. They are high-tech electronic functional materials, mainly used in the manufacture of electromagnetic wave shielding, thi...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 刘宁刘子英任明淑张艳彭春宁
Owner CHINA LUCKY FILM CORP
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