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A kind of preparation method and application of highly conductive flake silver powder

A technology of flaky silver powder and high conductivity, which is applied in the field of preparation of high conductive flaky silver powder, can solve the problems of wide powder size distribution, low tap density, insufficient flaky degree, etc., and achieve particle size distribution Narrow, increased dosage, good dispersion performance

Active Publication Date: 2017-11-03
KUNMING INST OF PRECIOUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the shortcomings of the traditional mechanical ball milling method, such as wide powder size distribution, insufficient flake degree, and low tap density, and its application shows that the overall electrical properties of the silver paste are improved.

Method used

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  • A kind of preparation method and application of highly conductive flake silver powder
  • A kind of preparation method and application of highly conductive flake silver powder
  • A kind of preparation method and application of highly conductive flake silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Requirements: The silver content of the spherical or quasi-spherical ultrafine silver powder is 99.95-99.99%, and the particle size is 40-80 nanometers. The particle size of the conductive graphite powder is 130-180 microns, and the carbon content is 99.98-99.99%. The diameters of the zirconia balls are mm and mm.

[0038] 2. Weigh 1,000 grams of spherical silver powder, add 8.16 grams of conductive graphite powder, 8.16 grams of terpineol ball milling aid, and 1,024.49 grams of isopropanol ball milling solvent, and grind it thoroughly to make it evenly mixed. Add 8000 grams of mass ratio as The zirconia balls were ball milled in a horizontal ball mill with a ball milling speed of 60 rpm and a ball milling time of 20 hours. The ball-milled product was repeatedly washed 5 times with absolute ethanol, dried in vacuum at 45° C. for 9 hours, and finally pulverized. The flaky silver powder with D50 of 1.0 micron, D90 of 1.7 micron, Dmax of less than 4 microns, tap ...

Embodiment 2

[0041] 1. Requirements: The silver content of the spherical or quasi-spherical ultrafine silver powder is 99.95-99.99%, and the particle size is 70-120 nanometers. The particle size of the modified conductive expanded graphite powder is 80-120 microns, and the carbon content is 99.98-99.99%. The diameter of the zirconia ball is mm.

[0042] 2. Weigh 1000 grams of spherical silver powder, add 12.14 grams of modified conductive expanded graphite powder, 4.05 grams of polyvinyl alcohol ball milling aid, and 1008.10 grams of n-butanol ball milling solvent, and grind it thoroughly to make it evenly mixed. Add 10000 grams of diameter The zirconia balls of millimeters are milled in a horizontal ball mill with a milling speed of 130 rpm and a milling time of 16 hours. The ball-milled product was repeatedly washed 6 times with absolute ethanol, dried in vacuum at 45° C. for 8 hours, and finally pulverized. The flaky silver powder with D50 of 1.4 microns, D90 of 3.3 microns, Dmax ...

Embodiment 3

[0045] 1. Requirements: The silver content of the spherical or quasi-spherical ultrafine silver powder is 99.95-99.99%, and the particle size is 160-200 nanometers. The particle size of the conductive graphite powder is 1.5-50 microns, and the carbon content is 99.98-99.99%. The particle size of the modified conductive expanded graphite powder is 50-70 microns, and the carbon content is 99.98-99.99%. The diameters of the zirconia balls are mm and mm.

[0046] 2, take by weighing 1000 gram spherical silver powders, add 16.06 gram mass ratios and be conductive graphite powder: the mixture of conductive expanded graphite powder=2:1 after modification, 2.01 gram polyacrylic acid ball milling aids, 989.96 gram ethylene glycol ball milling solvents, Grind well to mix well. Add 6000 grams of mass ratio as The zirconia balls were ball milled in a horizontal ball mill with a ball milling speed of 180 rpm and a ball milling time of 10 hours. The ball-milled product was repeated...

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Abstract

The invention discloses a preparation method and application of a high-conductivity flaky silver powder, comprising the following steps: using high-purity spherical or quasi-spherical silver powder as a main material; adding graphite powder; adding a ball milling aid; adding a ball milling solvent; The raw material is adjusted into a slurry precursor, and ball milled for a certain period of time; the product is washed, dried, and pulverized to obtain flaky silver powder. The flaky silver powder with a D50 of 1.0-1.9 microns, a D90 of 1.7-4.2 microns, a Dmax of 7 microns or less, a tap density of 3.4-4.3 g / ml and a specific surface area of ​​0.9-2.6 m2 / g is prepared. The flaky silver powder has narrow particle size distribution and is easy to disperse, and the conductive paste prepared by using it has low volume resistivity, excellent electrical conductivity and good adhesion after curing. It is used for the modulation of low-temperature curing conductive silver paste, which can meet the needs of silver powder adaptation in touch screens, flexible circuit boards, radio frequency identification, membrane switches and other fields.

Description

technical field [0001] The invention relates to a preparation method of a noble metal flake powder material, in particular to a preparation method and application of a high-conductivity flake silver powder. Background technique [0002] Low-temperature curing conductive paste is generally composed of three main components: conductive powder, organic adhesive resin, and solvent. Among them, silver-based low-temperature conductive paste has become the most widely used product due to its price and conductivity advantages. Conductive silver paste is a material in which ultra-fine silver powder is evenly dispersed in a polymer base material, and the cured point, line, and film have electrical conductivity. Its conductive function mainly depends on adding silver particles with specific shape and size to provide free electrons. Therefore, silver powder becomes the main factor that determines the electrical properties of silver paste and even the comprehensive application function o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04H01B1/22
CPCH01B1/22B22F9/04B22F2009/043B22F1/068
Inventor 李俊鹏梁诗宇陈家林熊庆丰黄富春田相亮
Owner KUNMING INST OF PRECIOUS METALS
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