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Method for preparing flake silver powder

The technology of flake silver powder and metallic silver powder is applied in the field of preparation of flake silver powder. Excellent properties and dispersibility

Active Publication Date: 2013-03-20
JIANGSU BOQIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are several problems in the production of flake silver powder by mechanical ball milling: 1. It cannot be produced continuously, and the tank body must be opened every time feeding, which requires a certain working time, and the same is true for taking materials; 2. Only the product silver powder and grinding beads are mixed in One piece, the impact of the grinding beads will cause the conjoined phenomenon of silver powder, which is not easy to separate, and needs to be cleaned later, which consumes more time; third, the ball milling time is often longer, about 8 hours to achieve a more ideal effect, which limits Large-scale production; Fourth, the material of the grinding ball is easily ground out in a small amount during the grinding process, polluting the product quality

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  • Method for preparing flake silver powder
  • Method for preparing flake silver powder
  • Method for preparing flake silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Weigh 5kg of spherical silver powder with a silver content > 99.99% and a particle size of about 2 μm and good dispersion prepared by physical vapor deposition, pour it into 25L of absolute ethanol, add it to a stirring tank and ultrasonically stir for 15 minutes to make a silver powder slurry ;

[0035] 2) Weigh 2 kg of Φ0.5mm diameter zirconia grinding beads and add them to the grinding chamber of the sand mill, and add the silver powder slurry in step (1) into the grinding chamber through the pneumatic pump, the flow rate is 2L / min, and the outlet of the sand mill Or it can also be called the mixing tank connected to the discharge port of the sanding chamber in step (1), so that the sanded material enters the mixing tank, and after the material is stirred, it returns to the grinding chamber for circular grinding, and at the same time starts the sand mill at a speed of 800r / min ; At the same time, cold water is used to cool the grinding chamber, and the temperature...

Embodiment 2

[0039] 1) Weigh 2 kg of spherical silver powder with a silver content >99.99% and a particle size of about 0.8 μm and good dispersion prepared by physical vapor deposition, add it to a mixing tank, pour 10 L of absolute ethanol, add 300 g of stearic acid, and ultrasonically Stir for 20 minutes to make a silver powder slurry.

[0040] 2) Weigh 2 kg of Φ0.3mm diameter zirconia grinding beads and add them to the grinding chamber of the sand mill, add the silver powder slurry into the grinding chamber through the pneumatic pump, and connect the outlet of the grinding chamber to the mixing tank in step (1), with a flow rate of 1L / min, start the sand mill at the same time, the rotating speed is 800r / min, circularly grind for 1h, connect the finished product kettle to obtain the silver powder slurry of sheet.

[0041] 3) After the flaky silver powder slurry is precipitated, it is washed with absolute ethanol to make a flaky silver slurry.

[0042] 4) Take out the flake silver slurr...

Embodiment 3

[0045] 1) Weigh 10kg of spherical silver powder with a silver content > 99.99% and a particle size of about 0.5μm and good dispersion prepared by physical vapor deposition, add it to a small mixing tank, pour it into 50L of absolute ethanol, and add 1000g of stearin acid, and stirred for 30 minutes to make a silver powder slurry.

[0046]2) Weigh 2 kg of Φ0.3mm diameter zirconia grinding beads and add them to the grinding chamber of the sand mill with a flow rate of 1L / min. Put the silver powder slurry into the grinding chamber through the pneumatic pump, and stir in step (1) at the outlet of the grinding chamber tank, start the sand mill at the same time, the rotating speed is 800r / min, circularly grind for 1h, and receive the silver powder slurry in the finished product kettle.

[0047] 3) After the flaky silver powder slurry is precipitated, it is washed with absolute ethanol to prepare ethanol flaky silver powder slurry with a solid content of 25%.

[0048] 4) Take out th...

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Abstract

The invention discloses a method for preparing flake silver powder. The method comprises the following steps of: taking silver powder prepared by a physical vapor deposition method as a raw material, adding the silver powder into an organic solvent, and carrying out mechanical dispersion processing so as to obtain dispersed slurry; feeding the dispersed slurry to a grinder, connecting a material outlet into a finished product kettle after carrying out cyclic grinding for 1-3 hours, and thus obtaining required flake silver powder slurry; and drying the flake silver powder slurry through spray drying, thereby obtaining the flake silver powder. The method disclosed by the invention has the advantages of simple process flow, good dispersion performance, stable performance index, high yield, short processing time, and easiness in industrialized production.

Description

technical field [0001] The invention relates to a preparation method of flaky silver powder used in the electronic industry, in particular to a preparation method of flaky silver powder with excellent conductivity for conductive paste, film paste and solar cell panels. 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 for solar cells, medium and low temperature conductive paste, Conductive adhesives, anti-static products, etc., are important functional materials for electronic components. [0003] At present, flake silver powder is mainly prepared by chemical reduction method and mechanical ball milling method, that is, planetary milling ball milling method. The particle structure of the silver powder obtained by the chemical reduction method is uni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 王翠霞林辰赵成磊陈钢强
Owner JIANGSU BOQIAN NEW MATERIALS
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