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Preparation method of flake silver powder and application thereof

A technology of flaky silver powder and silver source, which is applied in the field of preparation of precious metal powder, can solve problems such as the inability to realize ultra-fine conductive lines, and achieve the effects of excellent compactness, good dispersion, and simple operation

Inactive Publication Date: 2019-05-31
北京氦舶科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The silver powder currently sold in the market cannot meet the requirements of the same electronic paste for making ultra-fine conductive lines under laser etching technology and screen printing technology

Method used

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  • Preparation method of flake silver powder and application thereof
  • Preparation method of flake silver powder and application thereof
  • Preparation method of flake silver powder and application thereof

Examples

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preparation example Construction

[0033] A preparation method of flake silver powder, comprising preparing silver source solution and reducing agent solution, is characterized in that the method comprises the following steps:

[0034] (1) adjust the pH of the silver source solution to 7-9;

[0035] (2) The reducing agent solution is mixed with the silver source solution to react; after the reaction is over, the reacted precipitate is washed with deionized water;

[0036] (3) Add dissolved surfactant to the precipitate for modification, then perform wet grinding modification, sieve, and dry to obtain general-purpose silver powder.

[0037] Preferably, the silver source is one or more combinations of silver nitrate, silver ammine ions, and silver carbonate; the concentration of the silver source solution is 90-110g / L; the solvent of the silver source solution for deionized water.

[0038] Preferably, the reducing agent is one or a combination of ascorbic acid, glucose, hydrogen peroxide; the quality of the red...

Embodiment 1

[0049] A preparation method of flake silver powder, comprising preparing silver source solution and reducing agent solution, is characterized in that the method comprises the following steps:

[0050] (1) Weigh 50 g of silver ammonium ions, add 500 ml of deionized water to form a silver source solution, then add dilute ammonia and / or dilute nitric acid to the silver source solution to adjust the pH to 8.0 ± 0.5;

[0051] (2) Take glucose according to 0.8 times of silver source quality, add the deionized water of 200ml and be made into reducing agent solution;

[0052] (3) At 35°C, while uniformly stirring the silver source solution, uniformly add the reducing agent solution to the silver source solution at a rate of 2mL / min; after the reaction, wash the precipitate after the reaction with deionized water , until the conductivity of the washing solution is 20 μs / cm;

[0053] (4) According to 1.5% of the silver atomic mass in the silver source, the surfactant that is composed o...

Embodiment 2

[0056] A preparation method of flake silver powder, comprising preparing silver source solution and reducing agent solution, is characterized in that the method comprises the following steps:

[0057] (1) Take 50g of silver nitrate, add 450ml of deionized water to make a silver source solution, then add sodium bicarbonate and / or dilute acetic acid to the silver source solution to adjust the pH to 7;

[0058] (2) Take hydrogen peroxide according to 0.5 times of the silver source quality, add 200ml of deionized water to make reducing agent solution;

[0059] (3) At 30°C, while uniformly stirring the silver source solution, uniformly add the reducing agent solution to the silver source solution at a rate of 0.5mL / min; after the reaction, wash the precipitate after the reaction with deionized water Wash until the conductivity of the washing solution is 20 μs / cm;

[0060] (3) Take stearic acid by weighing 0.2% of the atomic mass of silver in the silver source and dissolve it in ac...

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Abstract

The invention specifically relates to a preparation method of flake silver powder and application thereof. The preparation method of the flaky silver powder comprises the following steps of adjustingthe pH value of a silver source solution to 7-9, mixing a reducing agent solution and the silver source solution for reaction, washing precipitates after the reaction clean with deionized water, and adding a surfactant into the precipitates for modification and then carrying out wet grinding modification, sieving and drying to obtain flake silver powder. The preparation method is simple in technology, low in cost and easy in industrialization, and the prepared silver powder has regular appearance, uniform particle size distribution, the tap density of 3.5-4, and the particle size of 500-1000 nm. The flake silver powder can be uniformly dispersed in electronic paste and is well compatible with resin in the electronic paste, and can simultaneously meet the technological requirements of laseretching and screen printing.

Description

technical field [0001] The invention belongs to the technical field of precious metal powder preparation, and in particular relates to a preparation method of flake silver powder and its application in laser etching and screen printing electronic paste. Background technique [0002] With the continuous and rapid development of electronic emerging industries, the borders of electronic products such as smartphones, tablet computers, e-books, and wearable watches are getting narrower and narrower. Therefore, higher requirements are placed on the fineness of the conductive lines on the surface of the touch screen. . The nano-silver powder in the nano-electronic paste is not easy to oxidize when making conductive lines, has particularly good conductivity, low expansion rate, and does not require an external protective layer, which just meets this requirement. [0003] At present, the conductive lines are mainly produced by screen printing technology and laser etching technology....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 商海孙晓光郎嘉良赵刚
Owner 北京氦舶科技有限责任公司