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Manufacturing method for flaky silver powder with high flake rate and narrow particle size distribution

A technology of particle size distribution and flaky silver powder, applied in the field of preparation of flaky silver powder, can solve the problems of uneven particle size, cold welding agglomeration, low flaky rate of flaky silver powder, etc., achieve narrow particle size distribution and avoid agglomeration , The effect of high flake rate

Active Publication Date: 2016-02-24
NANJING COJINA NEW MATERIAL INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the many variable factors in the ball milling process, different processes, different producers, or even the same process and the same producer produce different batches of flake silver powder, it is often difficult to agree on the technical indicators, and at the same time, cold welding agglomeration will occur. The flake silver powder has a low flake rate and uneven particle size, which in turn affects the performance of the conductive silver glue.

Method used

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  • Manufacturing method for flaky silver powder with high flake rate and narrow particle size distribution
  • Manufacturing method for flaky silver powder with high flake rate and narrow particle size distribution

Examples

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Effect test

Embodiment 1

[0018] A preparation method of flaky silver powder with high flaky rate and narrow particle size distribution. First, select the precursor spherical silver powder and ball milling balls to soak in the ball milling medium solvent, then add block type polymer dispersant, and then ultrasonicate at a certain temperature treatment to promote the dispersion of spherical silver powder on the surface of ball milling balls at the molecular level; in the process of ball milling, pre-grinding is carried out at first at a low speed, so that the silver powder and balls are evenly distributed in the ball milling tank, and then high-speed ball milling to obtain flakes Flake silver powder with high yield and narrow particle size distribution; the specific steps are as follows:

[0019] (1) Add ball milling aid oleic acid to the ball milling medium solvent ethanol, the amount of oleic acid added is 0.5% of the total mass of the spherical silver powder;

[0020] (2) Soak 0.2kg precursor spheric...

Embodiment 2

[0025] A preparation method of flaky silver powder with high flaky rate and narrow particle size distribution, the specific steps are as follows:

[0026] (1) Add stearic acid, a ball milling aid, to ethanol, and the amount of stearic acid added is 2% of the total mass of the spherical silver powder;

[0027] (2) Soak 25g of precursor spherical silver powder and 1000g of ball milling balls in the above solvent, then add block type polymer dispersant poly(vinylpyridine)-b-(methoxypolyethylene glycol acrylate), and then Ultrasonic treatment at 70°C for 10 minutes, wherein the mass ratio of spherical silver powder and ball milling medium solvent is 0.2:1, and the size range of ball milling balls is 2mm;

[0028] (3) Transfer the above-mentioned spherical silver powder, milling balls, milling medium solvent and milling aid to a 1L milling tank, and perform low-speed ball milling in a planetary ball mill at a milling speed of 50r / min to make the silver powder and milling balls in t...

Embodiment 3

[0032] A preparation method of flaky silver powder with high flaky rate and narrow particle size distribution, the specific steps are as follows:

[0033] (1) Add ball milling aid oleic acid amide to propanol, the amount of oleic acid amide added is 3% of the total mass of spherical silver powder;

[0034] (2) Soak 1kg of precursor spherical silver powder and 25kg of ball milling balls in the above solvent, then add block-type polymer dispersant poly(dimethylaminoethyl acrylate)-b-polyethylene glycol, and then Ultrasonic treatment for 60 minutes, wherein the mass ratio of spherical silver powder and ball milling medium solvent is 0.6:1, and the size range of ball milling balls is 0.1mm;

[0035] (3) Transfer the above-mentioned spherical silver powder, milling balls, milling medium solvent and milling aid to a 15L milling tank, and perform low-speed ball milling in a planetary ball mill at a milling speed of 120r / min to make the silver powder and milling balls in the milling t...

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Abstract

The invention discloses a manufacturing method for flaky silver powder with the high flake rate and narrow particle size distribution. The method includes the steps that firstly, spherical precursor silver powder and ball-milling balls are selected to be soaked in a ball-milling medium solvent, block type polymeric dispersant is then added, ultrasonic treatment is performed at a certain temperature, and the spherical silver powder is better promoted to be dispersed on the surfaces of the ball-milling balls at the molecular level; and in the ball-milling process, pre-milling is performed under the condition of the low rotation speed, the silver powder and the ball-milling balls are evenly distributed in a ball-milling tank, high-speed ball-milling is the performed, and therefore the flaky silver powder with the high flake rate and narrow particle size distribution is obtained. The flaky silver powder manufactured through the method has the beneficial effects that the flake rate is high, particle size distribution is narrow, and the requirement of silver colloid for the electrical property can be met on the premise that the silver content in the silver colloid is reduced.

Description

technical field [0001] The present invention relates to the preparation method of metal powder for electronic industry, in particular to the preparation method of mechanical ball milling for flake silver powder used in the manufacture of electronic glue for electronics industry, specifically a flake silver powder with high flake rate and narrow particle size distribution method of preparation. Background technique [0002] Flake silver powder is widely used in the field of optoelectronic device packaging materials, and its preparation and performance research has received great attention. In order to obtain flaky silver powder with ideal application performance, researchers at home and abroad have carried out a lot of research work. At present, the methods for preparing flake silver powder are mainly divided into chemical reduction method and mechanical ball milling method. The chemical reduction method refers to a method of preparing silver powder by reducing silver compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
CPCB22F9/04B22F2009/043
Inventor 琚伟马望京
Owner NANJING COJINA NEW MATERIAL INST CO LTD
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