Method and device for preparing spherical silver powder by fractional step method

A step-by-step method and silver powder technology, which is applied in the chemical industry, can solve the problems of unstable spherical silver powder quality, poor sphericity and fluidity of silver powder, and achieve the effect of being suitable for large-scale production, superior electrical conductivity, and high performance indicators

Active Publication Date: 2017-03-22
珠海德晶光电科技有限公司
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[0003] The object of the present invention is to provide a method and device for preparing spherical silver powder by step-by-step method. The method and device for preparing spherical silver powder by

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  • Method and device for preparing spherical silver powder by fractional step method
  • Method and device for preparing spherical silver powder by fractional step method
  • Method and device for preparing spherical silver powder by fractional step method

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[0020] Example 1

[0021] Such as figure 1 As shown, the present invention provides a method for preparing spherical silver powder by a stepwise method, which includes the following steps:

[0022] 1) The step of controlling the reduction reaction to generate nano-silver seed crystals, weighing the first batch of silver ammonia solution and the first batch of reducing agent according to the mass ratio of 1:0.1, the concentration of silver ammonia solution is 7.3% Wt, and the concentration of reducing agent is 80 ppm. Weigh the first batch of 20% Wt ammonia water according to the aforementioned silver-ammonia solution mass ratio of 1:0.13, weigh the first batch of dispersant according to the aforementioned silver-ammonia solution mass ratio of 1:0.2, and add the aforementioned materials to In a first reaction vessel, the reaction time is 0.02 minutes, and the pH value of the reaction solution is adjusted by the pH regulator to 9.3;

[0023] 2) The step of controlling the reduction re...

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Abstract

The invention discloses a method for preparing spherical silver powder by a fractional step method. Reducing liquid, silver ammonium solution, a PH adjusting agent and a dispersing agent are respectively added in multiple serially connected reaction devices in sequence in a jet manner, and are fully mixed in sequence in different reaction containers for fraction step reaction. (1) a nanosilver seed crystal is generated by controlling a reducing reaction; (2) the nanosilver seed crystal is selectively grown by controlling reducing reaction conditions; (3) the damage of sphericity of silver powder due to quicker growth speed is prevented by controlling the reducing reaction conditions; and (4) micron-grade spherical silver powder with uniformly distributed particle sizes is quickly grown by controlling the reducing reaction conditions. Finally, the generated high-dispersibility spherical silver particles and the remained liquid are conveyed into a separation system; silver particles are separated from the remained liquid by a centrifugation or floculation precipitation effect to obtain the high-dispersibility spherical silver particles; the spherical silver particles are cleaned by de-ionized water or ethanol for drying to obtain the spherical silver powder. The method is simple and stable in production process, and is higher in quality of the spherical silver powder.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing silver powder, in particular to a method and a device for preparing spherical silver powder by a step-by-step method. Background technique [0002] The conductive paste prepared by spherical silver powder has the characteristics of non-stick roll for padding, easy printing off the screen, extremely small shrinkage, and dense sintered film. It is widely used in the high-end electronic paste market. It is a solar cell, PDP shielding silver paste and high-grade Excellent raw material for conductive thick film pastes. There are many methods for preparing spherical silver powder, such as chemical reduction method, electrochemical deposition method, electrolysis method, sputtering method, vibration ball milling method, sol-gel method, etc. In the prior art, the chemical reduction method is the most common method for preparing spherical silver powder. Such as pa...

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Application Information

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IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 龚辉
Owner 珠海德晶光电科技有限公司
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