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Preparation method of microcrystalline silver powder with hollow structure

A hollow structure and microcrystalline technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of sensitive reaction control conditions, harsh preparation conditions of hollow structure silver powder, and difficulty of hollow structure silver powder

Active Publication Date: 2019-10-22
山东建邦胶体材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the preparation conditions of hollow structure silver powder are generally harsh, the reaction control conditions are relatively sensitive, and the output efficiency is usually not high, therefore, the large-scale industrial production of hollow structure silver powder is still a technical problem in the industry

Method used

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  • Preparation method of microcrystalline silver powder with hollow structure
  • Preparation method of microcrystalline silver powder with hollow structure
  • Preparation method of microcrystalline silver powder with hollow structure

Examples

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Effect test

Embodiment 1

[0032] A preparation method of microcrystalline silver powder containing a hollow structure, comprising the following steps:

[0033] (1) Silver nitrate solution, ascorbic acid solution and dispersant solution containing concentrated nitric acid are configured according to concentration;

[0034] (2) Control the flow rate of the dropping rate of 100-400mL / min, add the silver nitrate solution and the ascorbic acid solution into the dispersant solution at the same time, stop adding the silver salt solution when the remaining 10% of the silver nitrate solution is left, and wait for the ascorbic acid solution to be added to the reaction kettle After neutralization, add hydrazine hydrate and emulsifier into the reaction kettle, and drop the remaining silver nitrate solution at the same time;

[0035] (3) After the reaction is finished, separate the supernatant to obtain silver powder, wash the silver powder with deionized water and ethanol, and dry to obtain microcrystalline silver...

Embodiment 2

[0038] A preparation method of microcrystalline silver powder containing a hollow structure, comprising the following steps:

[0039] (1) Silver nitrate solution, ascorbic acid solution and dispersant solution containing concentrated nitric acid are configured according to concentration;

[0040] (2) Control the flow rate of the dropping rate of 100-400mL / min, add the silver nitrate solution and the ascorbic acid solution to the dispersant solution at the same time, stop adding the silver salt solution when the remaining 3% of the silver nitrate solution is left, and wait for the ascorbic acid solution to be added to the reaction kettle After neutralization, add hydrazine hydrate and emulsifier into the reaction kettle, and drop the remaining silver nitrate solution at the same time;

[0041] (3) After the reaction is finished, separate the supernatant to obtain silver powder, wash the silver powder with deionized water and ethanol, and dry to obtain microcrystalline silver po...

Embodiment 3

[0044] A preparation method of microcrystalline silver powder containing a hollow structure, comprising the following steps:

[0045] (1) Silver nitrate solution, ascorbic acid solution and dispersant solution containing concentrated nitric acid are configured according to concentration;

[0046] (2) Control the flow rate of the dropping rate of 100-400mL / min, add the silver nitrate solution and the ascorbic acid solution to the dispersant solution at the same time, stop adding the silver salt solution when the remaining 15% of the silver nitrate solution is left, and wait for the ascorbic acid solution to be added to the reaction kettle After neutralization, add hydrazine hydrate and emulsifier into the reaction kettle, and drop the remaining silver nitrate solution at the same time;

[0047] (3) After the reaction is finished, separate the supernatant to obtain silver powder, wash the silver powder with deionized water and ethanol, and dry to obtain microcrystalline silver p...

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Abstract

The invention relates to the technical field of new metal powder materials, in particular to a preparation method of a microcrystalline silver powder with a hollow structure. The preparation method ofthe microcrystalline silver powder with the hollow structure comprises the steps of synthesizing high crystallinity microcrystalline silver powder, oxidizing a hydrazine hydrate with an emulsifier toform gas, and taking gas as the core to generate the microcrystalline silver powder with the hollow structure. By means of the preparation method, the microcrystalline silver powder with the excellent dispersity, controllable morphology and hollow structure is obtained, and the whole process is non-toxic, pollution-free, low energy consumption and easy to operate.

Description

technical field [0001] The invention relates to the technical field of new metal powder materials, in particular to a method for preparing microcrystalline silver powder with a hollow structure. Background technique [0002] With the rapid development of the electronic information industry, precious metal electronic paste has become one of the key materials for the production of various electronic devices. Metallic silver has the best thermal conductivity and relatively stable chemical properties, making silver powder an important part of conductive silver paste as a conductive filler, which directly determines the performance of the paste. It is currently the most widely used and the largest amount. A precious metal powder material. [0003] Under the pressure of market competition, high performance and low cost are an inevitable trend in the development of electronic paste. Ensuring the performance of the paste and reducing the silver content of the paste have become the ...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/0655B22F1/065
Inventor 陈波王艳云许文艳韩世生赵辉
Owner 山东建邦胶体材料有限公司
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