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Functional silver flake and preparation method thereof

A flake silver powder and functional technology, applied in the field of powder material preparation and metal powder metallurgy, can solve the problems of easy stratification and agglomeration, easy sedimentation, etc., and achieve the effect of less organic residue, preventing agglomeration and good suspension.

Active Publication Date: 2013-09-18
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

[0010] The purpose of the present invention is to make up for the deficiencies of the prior art, to provide a flake silver powder with a simple production process, easy mass production, and a three-dimensional cross-linked space structure, which can effectively solve the problems of easy sedimentation and separation of silver powder in conductive inks and coatings. Problems such as layer caking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example is a preparation example of flake silver powder with a three-dimensional crosslinked structure.

[0040] Follow these steps:

[0041] A. Preparation of microcrystalline silver powder containing silver oxide by one reduction:

[0042] (1) Weigh 1 kg of silver nitrate solid and place it in a reaction kettle, add 3 L of pure water to dissolve according to the ratio of raw material weight 1:3. Add 130 grams of reducing agent glycerol according to 95% of the amount required for reduction, add 10 g of dispersant polyvinylpyrrolidone, and finally add pure water to dilute the system to 8 L to prepare a solution with a silver nitrate content of 125 g / L. Stir evenly and heat to 80°C, the pH of the solution is about 4 at this time.

[0043] (2) Weigh 1 kg of sodium hydroxide, add 5 L of pure water to form a lye system with a concentration of 200 g / L, and place it in an lye tank.

[0044] (3) After heating the silver nitrate system to 80°C and stirring at a constant...

Embodiment 2

[0052] One reduction preparation of microcrystalline silver powder containing silver oxide:

[0053] (1) Weigh 1 kg of silver nitrate solid and place it in a reaction kettle, add 3 L of pure water to dissolve according to the ratio of raw material weight 1:3. Add 130 grams of reducing agent glycerol according to 95% of the amount required for reduction, add 10 g of dispersant polyvinylpyrrolidone, and finally add pure water to dilute the system to 8 L to prepare a solution with a silver nitrate content of 125 g / L. Stir evenly and heat to 80°C, the pH of the solution is about 4 at this time.

[0054] (2) Weigh 1 kg of sodium hydroxide, add 5 L of pure water to form a lye system with a concentration of 200 g / L, and place it in an lye tank.

[0055] (3) After heating the silver nitrate system to 80°C and stirring at a constant speed of 60r / min, slowly add 3.6L of sodium hydroxide solution to slowly raise the pH of the reaction system to a pH of 9-10, stop adding and stir, and mo...

Embodiment 3

[0064] One reduction preparation of microcrystalline silver powder containing silver oxide:

[0065] (1) Weigh 1 kg of silver nitrate solid and place it in a reaction kettle, add 3 L of pure water to dissolve according to the ratio of raw material weight 1:3. Add 130 grams of reducing agent glycerol according to 95% of the amount required for reduction, add 10 g of dispersant polyvinylpyrrolidone, and finally add pure water to dilute the system to 8 L to prepare a solution with a silver nitrate content of 125 g / L. Stir evenly and heat to 80°C, the pH of the solution is about 4 at this time.

[0066] (2) Weigh 1 kg of sodium hydroxide, add 5 L of pure water to form a lye system with a concentration of 200 g / L, and place it in an lye tank.

[0067] (3) After heating the silver nitrate system to 80°C and stirring at a constant speed of 60r / min, slowly add 3.6L of sodium hydroxide solution to slowly raise the pH of the reaction system to a pH of 9-10, stop adding and stir, and mo...

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Abstract

The invention discloses a preparation method of functional silver flakes, which includes the following steps of (A), preparing microcrystalline micro-silver powder containing silver oxide by means of primary reduction; (B), grinding silver flakes with a ball mill and then filtering the same to obtain silver slurry containing ball-milled dispersant; (C), treating the silver powder by etching and secondary reduction to obtain stereoscopic cross-linked structural silver flakes with 3-12% micro-silver powder, wherein a reducing agent A is an alcohol weak reductant while a reducing agent B is a strong reductant. The preparation method is simple in process, easy to realize mass production and applicable to large-scale production in the industry. The functional silver flakes prepared by the method have stereoscopic cross-linked reticular space structures, small in grain size and low in apparent density. Besides, since the functional silver flakes contain 3-10% of monocrystal or flocculent silver powder, point-surface contact among the silver powder and filling capability of the silver powder are improved, and conductivity is high.

Description

technical field [0001] The invention relates to the fields of metal powder metallurgy and powder material preparation, in particular to the preparation technology of functional flake silver powder used in electronic components. Background technique [0002] With the development of the electronics industry, the thick film conductor paste is also constantly updated and developed. As one of the main development directions of the electronics industry in the 21st century, its development and product update speed will also become faster. New electronic components Device and production process technology will require new silver powder and silver paste. From a technical point of view, in order to adapt to the continuous lightness, smallness, thinness, multi-function and low cost of electronic machines, silver powder and silver paste will develop towards simpler use process, stronger performance, higher reliability and lower cost, that is, Maximize the advantages of silver's electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 谭汝泉梁炳联宋先刚娄红涛王惠敏邱韬彭梅志张文秦朝军
Owner 广东羚光新材料股份有限公司
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