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A kind of method of producing flake silver powder

The technology of flake silver powder and silver powder is applied in the field of metal powder material preparation, which can solve the problems such as too large fluctuation of ball milling time on particle size, good dispersibility of flake silver powder, influence on electrical properties of silver powder, etc. Novel and excellent dispersion effect

Active Publication Date: 2019-06-28
广东羚光新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flaky silver powder prepared by the mechanical ball milling method has good dispersibility, high flatness, and is conducive to industrialization, but there are also certain problems
Dry ball milling solves the problem of complex procedures and difficulty in producing a series of flake silver powders with various average particle sizes in the flake silver process, but the fluctuation of the ball milling time on the particle size is too large; the production efficiency of planetary ball mills is high, but Many additives are used, which affect the electrical properties of silver powder, and the variety of silver powder produced is relatively single

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 45Kg of zirconia grinding balls with a diameter of 3mm and 10Kg of hard alloy balls with a diameter of 1mm, add them to a vertical mixing tank and mix evenly, stir at 250-350r / min for 60 hours, take them out, and sieve out 3MM zirconia grinding balls The impurities on the surface of the grinding balls were cleaned with pure water, and dried to obtain the scratched grinding balls.

[0027] Add 6.5Kg of raw silver powder with an average particle size of 1-2 μm, 45Kg of zirconia balls with a diameter of 3mm obtained above, 10Kg of ethanol solution with a content of 35%, and 70g of oleic acid into the ball mill and mix evenly, and the ball mill speed is 40r / min. , ball milled for 35 hours to obtain sheet silver slurry;

[0028] Wash with 30% ethanol solution and separate the powder from the ball mill; remove the supernatant after the filtrate is precipitated; move the obtained silver powder to an oven for drying at 60°C, and powder after drying to obtain about 6.5Kg o...

Embodiment 2

[0030] Weigh 45Kg of zirconia grinding balls with a diameter of 3mm and 10Kg of hard alloy balls with a diameter of 1mm, add them to a vertical mixing tank and mix evenly, stir at 250-350r / min for 60 hours, take them out, and sieve out 3MM zirconia grinding balls The impurities on the surface of the grinding balls were cleaned with pure water, and dried to obtain the scratched grinding balls.

[0031] Add 6.5Kg of raw silver powder with an average particle size of 2 to 4 μm, 45Kg of zirconia balls with a diameter of 3MM, 10Kg of ethanol solution with a content of 35%, and 70g of oleic acid into the ball mill and mix evenly. Obtain sheet silver slurry in hours;

[0032] Wash with 30% ethanol solution and separate the powder from the ball mill; remove the supernatant after the filtrate is precipitated; move the obtained silver powder to an oven for drying at 60°C, and powder after drying to obtain about 6.5Kg of flake silver powder . Average particle size of silver powder D 5...

Embodiment 3

[0034] Weigh 45Kg of zirconia grinding balls with a diameter of 3MM and 10Kg of hard alloy balls with a diameter of 1MM, add them to a vertical mixing tank and mix evenly, stir at 250-350r / min for 120 hours, take them out, and sieve out 3MM zirconia grinding balls The impurities on the surface of the grinding balls were cleaned with pure water, and dried to obtain the scratched grinding balls.

[0035] Add 6.5Kg of raw silver powder with an average particle size of 2-4μm, 45Kg of zirconia balls with a diameter of 3MM, 4Kg of ethanol solution with a content of 15%, and 70g of cetyl alcohol into the ball mill and mix evenly. Obtain sheet silver slurry in 25 hours;

[0036] Wash with 30% ethanol solution and separate the powder from the ball mill; remove the supernatant after the filtrate is precipitated; move the obtained silver powder to an oven for drying at 60°C, and powder after drying to obtain about 6.5Kg of flake silver powder . Average particle size of silver powder D ...

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Abstract

The invention discloses a method for producing flake silver powder. The production steps include: 1. scratching the surface of a zirconia grinding ball; 2. adding raw silver powder, a scratched grinding ball, a ball milling solvent and a ball milling aid into a ball mill for ball milling; 3. After washing with ethanol, remove the supernatant and dry it for powdering. The invention effectively solves the problems of large particle size fluctuation, uneven particle size distribution and easy occurrence of cold welding when the mechanical ball milling method is used to prepare flake silver powder. of silver powder. The technological process is simple, the powder dispersibility is excellent, the index is easy to control, the technological conditions are stable, and the industrial production is easy. The flake silver powder prepared by the method has uniform particle size and narrow particle size distribution, and can be used as a raw material for membrane switch and flexible circuit paste, and its various indicators can meet the requirements of membrane switch and flexible circuit paste.

Description

technical field [0001] The invention relates to the field of metal powder material preparation, in particular to a method for producing flake silver powder. Background technique [0002] Due to its low bulk density and large specific surface area, flake silver powder can save precious metal materials compared with general spherical silver powder and silver micropowder; the surface-to-surface contact between flake silver particles has a larger contact area, thereby reducing contact resistance. , improve the conductivity of the conductive paste. Various excellent use characteristics make it widely used in the electronic paste industry as a conductive filler. [0003] The preparation methods of flaky silver powder mainly include mechanical ball milling method, chemical reduction method and template method, etc. At present, most of the flaky silver powder used in electronic paste is produced by mechanical ball milling method. The flaky silver powder prepared by the mechanical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00
CPCB22F9/04B22F2009/043B22F2009/042B22F1/068
Inventor 梁炳联宋先刚娄红涛谭汝泉邱衍嵩
Owner 广东羚光新材料股份有限公司
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