A kind of preparation method of dendritic silver powder

A technology of dendritic and silver powder, applied in the field of preparation of dendritic silver powder, can solve the problems of difficulty in mass production, poor repeatability, and high heating temperature, and achieve the effects of high stability, shortened production cycle, and reduced processing cost.

Active Publication Date: 2022-07-01
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN101811196A reports a method for preparing dendritic micron silver powder by liquid-phase chemical synthesis. In this method, the oxidizing agent is quickly added to the reducing agent to prepare dendritic micron silver powder. The repeatability of the pouring method is poor, and the controllability and stability of silver powder preparation cannot be guaranteed. , it is difficult to achieve industrial mass production
The heating temperature of this method is higher than 100°C, which requires high energy consumption and is not conducive to mass production; in addition, a large amount of acetone needs to be added in the post-treatment of silver powder, which is harmful to human body and environment.

Method used

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  • A kind of preparation method of dendritic silver powder
  • A kind of preparation method of dendritic silver powder
  • A kind of preparation method of dendritic silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Dissolve 170 g of silver nitrate crystals in 1 L of deionized water, add 0.85 g of NaOH, mix and stir evenly, and control the temperature of the solution to be 35°C.

[0029] 2. Dissolve 175 g of ascorbic acid in 0.8 L of deionized water, add 2 g of oleic acid, mix and stir evenly, and control the temperature of the solution to be 35°C.

[0030] 3. The silver nitrate solution is added dropwise to the ascorbic acid solution with a peristaltic pump. The stirring speed of the ascorbic acid solution is 400 rpm, and the adding speed of the silver nitrate solution is 0.2 L / min. min until the solution is clear.

[0031] 4. The solid-liquid separation of the silver powder is carried out by means of suction filtration, and the wet powder is put into a 90 ℃ blast oven for drying, and the drying time is 12 h.

[0032] Analysis by scanning electron microscopy, such as figure 1 As shown, the morphology of the prepared silver powder is dendritic.

Embodiment 2

[0034] 1. Dissolve 3.675 kg of silver nitrate crystals in 31 L of deionized water, add 70 g of NaOH, mix and stir evenly, and control the temperature of the solution to be 35 °C.

[0035] 2. Dissolve 3.675 kg of ascorbic acid in 52 L of deionized water, add 37 g of oleic acid, mix and stir evenly, and control the temperature of the solution to be 35°C.

[0036] 3. The silver nitrate solution is added dropwise to the ascorbic acid solution with a peristaltic pump. The stirring speed of the ascorbic acid solution is 350 rpm, and the adding speed of the silver nitrate solution is 2 L / min. min until the solution is clear.

[0037] 4. The solid-liquid separation of the silver powder is carried out by means of suction filtration, and the wet powder is put into a 90 ℃ blast oven for drying, and the drying time is 12 h.

[0038] Analysis by scanning electron microscopy, such as figure 2 As shown, the morphology of the prepared silver powder is dendritic.

Embodiment 3

[0040] 1. Dissolve 1 kg of silver nitrate crystals in 10 L of deionized water, add 15 g of NaOH, mix and stir evenly, and control the temperature of the solution to be 45 °C.

[0041] 2. Dissolve 2 kg of glucose in 10 L of deionized water, add 20 g of oleic acid, mix and stir evenly, and control the temperature of the solution to be 45 °C.

[0042] 3. The silver nitrate solution is added dropwise to the ascorbic acid solution with a peristaltic pump. The stirring speed of the ascorbic acid solution is 550 rpm, and the adding speed of the silver nitrate solution is 5 L / min. min until the solution is clear.

[0043] 4. The solid-liquid separation of the silver powder is carried out by means of suction filtration, and the wet powder is put into a 90 ℃ blast oven for drying, and the drying time is 12 h.

[0044] Analysis by scanning electron microscopy, such as image 3 As shown, the morphology of the prepared silver powder is dendritic.

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Abstract

The invention discloses a preparation method of dendritic silver powder. Silver nitrate crystals are dissolved in deionized water to prepare a silver nitrate solution, ascorbic acid or glucose are dissolved in deionized water to prepare a reducing agent solution, and the silver nitrate solution is added dropwise to the reducing agent. The chemical reduction reaction is carried out in the solution, after the dropwise addition of the silver nitrate solution is completed, the stirring is stopped, the solid-liquid separation of the silver powder is carried out by means of suction filtration, and then the dendritic silver powder is obtained by drying; the silver powder prepared by the method of the present invention does not add any polymer dispersion It is easy to wash and collect, the waste liquid treatment cost is low, it is environmentally friendly, and it is suitable for industrial mass production; by adjusting the content of the nucleation control agent to control the morphology of the silver powder, the prepared silver powder is dendritic silver powder, and the average length of the trunk is 5~ 15 microns, the average length of a single branch is 0.5 to 3 microns.

Description

technical field [0001] The invention belongs to the field of new material preparation, and relates to a preparation method of metallic silver powder, in particular to a preparation method of dendritic silver powder. Background technique [0002] Conductive paste is the core material of the electronics industry and can be widely used in technical fields such as membrane switches, printed circuits, wireless radio frequency tags, and electronic paper electrode materials. Silver powder is the key material for the composition of the conductive paste. The three-dimensional dendritic silver powder has a unique three-dimensional skeleton structure. Compared with spherical silver powder and flake silver powder, under the same quality conditions, the prepared conductive silver paste is easier to form percolation network and anisotropic conductivity. . At present, liquid-phase chemical synthesis is the main method for preparing silver powder, which has the advantages of low cost and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/06
CPCB22F1/0007B22F9/24
Inventor 朱佩佩袁松王灿魏冰歆陈大鹏
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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