Preparation method of high-concentration superfine silver powder

An ultra-fine silver and high-concentration technology, which is applied in the field of preparation of high-concentration ultra-fine silver powder, can solve the problems of increased equipment cost and management cost, high waste water treatment cost, unstable expansion quality, etc., so as to reduce the discharge of production waste liquid. , Easy to operate, good dispersion effect

Inactive Publication Date: 2016-08-03
ZHEJIANG GUANGDA ELECTRONICS TECH
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Problems solved by technology

The existing industrial silver powder is mainly used in the liquid phase chemical reduction method, and other methods such as ball milling, PVD, and atomization are also used in different application fields, while the liquid phase reduction is mainly prepared by the batch method of silver powder. It is <150g/L, the most commonly used is <100g/l, and the batch size is tens of kilograms. It has the disadvantages of small production capacity and large volume of waste liquid in a single batch. The cost of wastewater treatment is very high, and the discharge without wastewater treatment seriou

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  • Preparation method of high-concentration superfine silver powder
  • Preparation method of high-concentration superfine silver powder
  • Preparation method of high-concentration superfine silver powder

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[0032] In order to solve the above problems, the present invention provides a method for preparing high-concentration ultrafine silver powder, which specifically includes the following steps:

[0033] Prepare solution reaction system A containing silver ions, reducing agent and dispersant solution B respectively, and keep them at 10-200℃;

[0034] Under stirring, A and B are mixed and reacted to obtain a precipitated powder. The obtained precipitated powder is collected by a solid-liquid separation device, washed and dried, and the obtained powder is sieved to obtain high-concentration ultrafine silver powder.

[0035] In a preferred embodiment, the silver ion-containing solution reaction system A includes a silver-containing material and a solvent, the silver ion concentration is 250-1000 g / l, and the solvent is deionized water, absolute ethanol or Anhydrous hexanol. In the solution reaction system A containing silver ions of the present invention, the concentration of silver ions ...

Example Embodiment

[0044] Implementation mode:

Example Embodiment

[0045] Embodiment 1, a method for preparing high-concentration ultrafine silver powder, specifically includes the following steps:

[0046] Prepare solution reaction system A containing silver ions, reducing agent and dispersant solution B respectively, and keep them at 10-200℃;

[0047] Under stirring, A and B are mixed and reacted to obtain a precipitated powder. The obtained precipitated powder is collected by a solid-liquid separation device, washed and dried, and the obtained powder is sieved to obtain high-concentration ultrafine silver powder.

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Abstract

The invention belongs to the technical field of silver powder preparation, and more specifically, the invention relates to a preparation method of high-concentration ultra-fine silver powder; the preparation method includes: respectively configuring a solution reaction system A containing silver ions, a reducing agent and a dispersant solution B , and keep warm at 10-200°C; under stirring, A and B are mixed and reacted to obtain a precipitated powder, and the obtained precipitated powder is collected by solid-liquid separation equipment for silver powder, washed and dried, and the obtained powder is passed through Sieve to obtain high-concentration ultra-fine silver powder. The silver powder prepared by the preparation method has good electrical conductivity and can be used for various sintered and low-temperature curing slurries; the preparation method can reduce industrial production waste liquid discharge, and is energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of silver powder preparation, and more specifically, the invention relates to a preparation method of high-concentration ultrafine silver powder. Background technique [0002] Silver powder is an important material in the electrical and electronic industries. It has excellent electrical conductivity, thermal conductivity, oxidation resistance, and chemical stability. It has price and performance advantages in precious metals. In addition to being used in traditional electric contact electrical materials and electronic pastes, it is also used in new fields such as medical antibacterial, photovoltaic energy, and catalysts. The market demand is huge. For example, the market demand in the photovoltaic industry has exceeded 1,000 tons per year. [0003] Silver powder preparation is a high-tech field integrating powder metallurgy, chemical industry, electronics, materials and other disciplines. Preparation meth...

Claims

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Application Information

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IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 唐元勋柴良李兴亮肖强
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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