Preparation method of highly dispersed micron order flake silver powder with large radius-thickness ratio

A flake silver powder, large diameter-to-thickness ratio technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of unfriendly reagent environment, unsuitable application, product agglomeration, etc.

Inactive Publication Date: 2017-05-24
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The method for preparing flaky silver powder reported above may have cumbersome reaction process, long reaction time, and serious product agglomeration; or the reagents used are not environmentally friendly; It is well applied to the current high-resolution printing equipment and meets the rapid development needs of product miniaturization

Method used

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  • Preparation method of highly dispersed micron order flake silver powder with large radius-thickness ratio
  • Preparation method of highly dispersed micron order flake silver powder with large radius-thickness ratio
  • Preparation method of highly dispersed micron order flake silver powder with large radius-thickness ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) 2.5g silver nitrate is dissolved in 50mL deionized water to make silver nitrate solution, and in this silver nitrate solution, dripping the concentrated nitric acid that mass fraction is 65% makes its solution pH be 0.5, obtains solution A;

[0031] (2) Dissolving 5.2 g of ascorbic acid in 50 mL of deionized water to prepare an ascorbic acid solution, and adding dropwise concentrated nitric acid with a mass fraction of 65% in the silver nitrate solution to make the pH of the solution 0.5, to obtain a mixed solution B;

[0032] (3) 0.3g Tween-80 is dissolved in 200mL deionized water to make Tween-80 solution, and in this silver nitrate solution, dripping concentrated nitric acid that mass fraction is 65% makes its solution pH be 0.5, obtains mixed Solution C;

[0033] (4) At room temperature, add mixed solution A to mixed solution C while stirring and mix evenly to obtain mixed solution D;

[0034] (5) At room temperature, add mixed solution D to mixed solution B wh...

Embodiment 2

[0038] On the basis of Example 1, only steps (1), (2), and (3) need to be changed to: add acetic acid dropwise to make the pH of the solution 0.5, and the rest of the steps are carried out according to Example 1. products such as figure 2 As shown, the flake silver powder accounts for about 85% of the mixed silver powder, wherein the average flake diameter of the ultrafine flake silver powder is 3.8 μm, and the average flake thickness is 0.08 μm.

Embodiment 3

[0040] On the basis of Example 2, it is only necessary to change steps (1), (2), and (3) to: add acetic acid dropwise to make the pH of the solution 4.0, and carry out the remaining steps according to Example 2. products such as image 3 As shown, the flaky silver powder accounts for about 70% of the mixed silver powder, wherein the ultrafine flaky silver powder has an average diameter of 4.2 μm and an average thickness of 0.07 μm.

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Abstract

The invention provides a preparation method of highly dispersed micron order flake silver powder with a large radius-thickness ratio. The type of silver powder is prepared by performing reaction on a silver salt solution (as an auxiliary shape adjustor) comprising a surfactant, an ascorbic acid solution (as a reducer) and an acidic solution (as a primary shape adjustor) by taking water as a solution. By adjusting the reaction parameters, highly dispersed micron order flake silver powder with large radius-thickness ratio and the content of 80% or above is obtained in one step. According to the preparation method provided by the invention, the operation is simple, the reaction condition is mild the cost is low, the output of silver powder is high and the repeatability is good, a conventional ball-milling step is cut out, and the preparation method is suitable forscale production and can be used in the fields of conductive slurry, electric contact materials, conductive adhesives and the like.

Description

technical field [0001] The present invention relates to a preparation method of micron-sized flaky silver powder with high dispersion and large diameter-thickness ratio, in particular to the preparation of micron-sized flaky silver powder by liquid phase reduction method, so as to replace the traditional mechanical ball milling method and can be directly applied to electronic paste and Among the microelectronic components, it belongs to the technical field of preparation of precious metal nanometer materials. [0002] technical background [0003] As an important precious metal powder, silver powder has been widely used as an important conductive functional material for conductors, resistors, and dielectric electronic pastes due to its good electrical and thermal conductivity and excellent chemical stability, and its usage is increasing . The structure of the material determines the performance of the material, and the performance of silver powders with different shapes will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/068
Inventor 杨宏伟郭帅龙方卫孟宪伟冯璐
Owner SINO PLATINUM METALS CO LTD
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