Method for preparing sheet silver powder with high dispersibility

A flake silver powder with high dispersibility technology, which is applied in the preparation of highly dispersible flaky silver powder for electromagnetic shielding coatings and in the field of conductive coatings. It can solve the problems of difficult control, poor stability, and unsatisfactory performance of flake silver. Achieve the effect of simple and feasible process flow, high flatness, stable and reliable process conditions

Active Publication Date: 2008-10-08
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The silver powder obtained by the chemical reduction method will not be further polluted by mechanical processing, the product has high purity, and the particle structure is uniform. Therefore, it is currently limited to laboratory research

Method used

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  • Method for preparing sheet silver powder with high dispersibility
  • Method for preparing sheet silver powder with high dispersibility
  • Method for preparing sheet silver powder with high dispersibility

Examples

Experimental program
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Effect test

preparation example Construction

[0021] The preparation method of highly dispersible flaky silver powder adopts the particle size D prepared by liquid phase reduction method. 50 Spherical raw material silver powder with a thickness of 1-3μm and a silver content >99.95% is ground into flake powder of required specifications by vertical stirring ball milling process or planetary ball milling process, and then its dispersion is improved by post-processing such as ultrasonic dispersion and air flow dispersion properties, the prepared film diameter D 50 3~25μm, bulk density 0.5~1.8g / cm 3 Highly dispersed flaky silver powder.

[0022] The two ball milling processes are as follows:

[0023] 1) Vertical stirring ball mill: Add 1 / 3 to 2 / 3 zirconia grinding balls of the volume of the ball milling tank in the vertical stirring ball milling tank, the diameter of the grinding medium ball is φ0. A certain proportion of large and small balls are used together, the solvent is absolute ethanol, the dosage is just enough to...

Embodiment 1

[0029] on vertical stirring ball mill

[0030] 1) Weigh 90 grams of silver content>99.95% and particle size D prepared by liquid phase reduction method 50 Spherical silver powder with good dispersion around 2μm;

[0031]2) Weigh 1350g of diameter φ1.5mm zirconia grinding balls into the ball milling tank, add absolute ethanol wet grinding medium until the balls are just submerged, add the above-mentioned raw material silver powder and 0.35g of oleic acid as a dispersant, start the ball mill, at 150rpm After the materials are completely stirred evenly at a low speed, the set speed is 250rpm for ball milling for 4 hours. During the ball milling process, the temperature of the water bath in the milling tank is controlled at 8°C. Mixture of silver powder and ethanol;

[0032] 3) Take out the mixed solution of silver powder and ethanol, add 1:1 oleic acid and polyvinylpyrrolidone according to the liquid volume to make the dispersant concentration of the mixed solution reach 1g / L, ...

Embodiment 2

[0035] On a vertical stirring ball mill

[0036] 1) Weigh 90 grams of the product with a purity >99.95% and a particle size D prepared by the liquid phase reduction method. 50 Spherical silver powder with good dispersion around 2μm;

[0037] 2) Weigh 1350g of diameter φ3mm zirconia grinding balls and put them into the ball milling tank, add anhydrous ethanol wet grinding medium until the balls are just submerged, add the above-mentioned raw material silver powder and 0.35g of oleic acid as a dispersant, start the ball mill, at a low speed of 150rpm After the materials are completely stirred evenly, the set speed is 350rpm for ball milling for 4 hours. During the ball milling process, the temperature of the water bath in the milling tank is controlled at 8°C. the mixture;

[0038] 3) Take out the mixed solution of silver powder and ethanol, add 1:1 oleic acid and polyvinylpyrrolidone according to the liquid volume to make the dispersant concentration of the mixed solution rea...

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Abstract

The invention discloses a preparation method of high-dispersion flake silver powder, which is characterized in that spherical raw material silver powder with the1 to 3Mum of particle size D50 and the more than 99.95 percent of silver content is ground into the flake silver powder by adopting a grinding machine, the dispersion is then improved by ultrasonic dispersion and airflow dispersion, and the high-dispersion flake silver powder with the 3 to 25Mum of flake diameter D50 and the apparent density of 0.5 to 1.8g / cm<3> is obtained. The preparation process has simple process flow, which is applicable to the industrial mass production of flake silver powder.

Description

technical field [0001] The invention relates to a preparation method of highly dispersible flaky silver powder, relating to a preparation method of flaky silver powder for electronic industry, in particular to a preparation method of highly dispersible flaky silver powder for conductive paint and electromagnetic shielding paint. Background technique [0002] Flake silver powder has relatively large specific surface area, stable chemical properties, and surface contact or line contact between particles, so it has good conductivity. It can replace spherical ultrafine silver powder to prepare silver paste, low-temperature polymer conductor paste, and conductive paste. Glue, anti-static products, etc., are important functional materials for electronic components. At the same time, for highly dispersible flaky silver powder, because of its low bulk density and large specific surface area, it can save precious metal materials. It is an ideal raw material for preparing conductive c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B01F11/02
Inventor 李永军武浚刘会基马骞杨克勇孟涛路维华吴川眉李军
Owner JINCHUAN GROUP LIMITED
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