Spherical silver particle, method for producing same, conductive paste, and device containing same

A manufacturing method and technology of silver particles, applied to conductive materials dispersed in non-conductive inorganic materials, transportation and packaging, metal processing equipment, etc., can solve the problem of dispersibility and storage stability decline, uneven particle size distribution of silver powder, Unable to achieve physical properties and other problems, to achieve the effect of excellent physical properties, simple process, and excellent sinterability

Active Publication Date: 2022-05-06
DAEJOO ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a physical method, the process of manufacturing and heating aerosol is complicated, and the energy consumption is large
Korean Laid-Open Patent No. 2002-0017490 discloses a chemical method for producing silver powder by dissolving silver nitrate in distilled water and then mixing it with ammonia water and reducing it with hydroquinone, including physical methods. Uneven particle size distribution and reduced sphericity
[0004] Especially in the case of powders, the smaller the particle size, the larger the specific surface area (BET), which increases in proportion to the square of the change in the diameter of the powder, and thus has a very large surface area, however, as the surface activity increases, it will lead to adsorption The fluidity of other components or powders adheres to each other, and the fluidity of the powder is reduced, and the dispersibility and storage stability are significantly reduced. When used in various fields, the desired physical properties cannot be achieved in many cases.

Method used

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  • Spherical silver particle, method for producing same, conductive paste, and device containing same
  • Spherical silver particle, method for producing same, conductive paste, and device containing same
  • Spherical silver particle, method for producing same, conductive paste, and device containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Pour 40kg of distilled water into the reactor, mix 800g of 10% HEC (hydroxyethyl-cellulose: hydroxyethyl-cellulose, Sigma-Aldrich, CAS No.9004-62-0), and then add 24Kg of 28% ammonia solution and stir. At this time, the temperature of the solution in the reactor was maintained at 50°C. A container is prepared as follows: 25.8Kg of silver nitrate and 12Kg of 28% ammonia solution are stirred. 10Kg of 50% caustic soda aqueous solution is prepared in the B container. Then, the following preparations were made in container C: 5Kg of a 37% aqueous formaldehyde solution (formalin) was added to 21Kg of distilled water, and 4Kg of a 10% arabic gum solution was added, followed by stirring.

[0064] While stirring the solution in the reactor at a speed of 2,000 rpm, the prepared solutions in the containers A, B, and C were simultaneously charged into the reactor at a speed of 0.5 kg per minute to produce slurry. The obtained slurry was washed and filtered with distilled water, ...

Embodiment 2

[0066]Pour 40kg of distilled water into the reactor, mix 800g of 10% HEC (hydroxyethyl-cellulose: hydroxyethyl-cellulose, Sigma-Aldrich, CAS No.9004-62-0), and then add 24Kg of 28% ammonia solution and stir. At this time, the temperature of the solution in the reactor was maintained at 85°C. A container is prepared as follows: 25.8Kg of silver nitrate and 12Kg of 28% ammonia solution are stirred. 8Kg of 50% caustic soda aqueous solution is prepared in container B. Then, the following preparations were made in container C: 5Kg of 37% formaldehyde aqueous solution was added to 21Kg of distilled water, and 4Kg of 10% arabic gum solution was added, followed by stirring.

[0067] While stirring the solution in the reactor at a speed of 2,000 rpm, the prepared solutions in the containers A, B, and C were simultaneously charged into the reactor at a speed of 1.0 kg per minute, thereby producing a slurry. The obtained slurry was washed and filtered with distilled water, then dried ...

Embodiment 3

[0069] Pour 40kg of distilled water into the reactor, mix 800g of 10% HEC (hydroxyethyl-cellulose: hydroxyethyl-cellulose, Sigma-Aldrich, CAS No.9004-62-0), and then add 24Kg of 28% ammonia solution and stir. At this time, the temperature of the solution in the reactor was maintained at 20°C. A container is prepared as follows: 25.8Kg of silver nitrate and 12Kg of 28% ammonia solution are stirred. 10Kg of 50% caustic soda aqueous solution is prepared in the B container. Then, the following preparations were made in container C: 5Kg of 37% formaldehyde aqueous solution was added to 21Kg of distilled water, and 4Kg of 10% arabic gum solution was added, followed by stirring.

[0070] While stirring the solution in the reactor at a speed of 2,000 rpm, the prepared solutions in the containers A, B, and C were simultaneously charged into the reactor at a speed of 3.0 kg per minute, thereby producing a slurry. The obtained slurry was washed and filtered with distilled water, then ...

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Abstract

The present invention relates to spherical silver particles having excellent dispersibility and internal pores, a method for producing the same, a conductive paste, and a device including the same. The manufacturing method comprises: a silver paste manufacturing step, to the dispersant aqueous solution containing the dispersant, simultaneously and with the same length of time, each of the ammonia solution containing the silver precursor, the reducing agent aqueous solution containing the reducing agent and the caustic soda aqueous solution are dropped into for use in Manufacture of silver particles; step of obtaining silver particles, cleaning, filtering and drying the silver paste.

Description

technical field [0001] The present invention relates to spherical silver particles having excellent dispersibility and having pores formed therein, a method for producing the same, a conductive paste, and a device including the same. Background technique [0002] Silver (Ag) powder has physical properties such as high electrical conductivity, thermal conductivity, and oxidation resistance, so it is widely used in various materials such as conductive inks including pastes for electronic materials, masking agents, and spacers. [0003] Generally speaking, there are physical methods and chemical methods for producing silver powder, and according to the production method, silver powder exhibits different densities, surface areas, average particle size, morphology, particle size distribution, and the like. US Granted Patent No. 5,439,502 discloses a method for producing silver powder by dissolving a thermally decomposable silver-containing compound in a volatile solvent and produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F9/04B22F1/05B22F1/065H01B1/22
CPCH01B1/22B22F9/04B22F9/24B22F1/065B22F2301/255
Inventor 金相祐尹致皓李荣浩林钟赞林武炫
Owner DAEJOO ELECTRONICS MATERIALS CO LTD
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