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Fine silver particle, process for producing fine silver particle, and apparatus for producing fine silver particle

A manufacturing method and silver nanoparticle technology are applied in the fields of silver microparticles, the manufacture of silver microparticles, and the manufacture of silver microparticles, which can solve the problems of low manufacturing efficiency, narrowed flow path, increased loss, etc., and achieve efficient manufacturing, increase The effect of aggregating the number of center points and increasing the number

Active Publication Date: 2010-01-13
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this production method, since the reduction of the silver-ammonia complex is carried out in the pipe, the flow path is narrowed due to the precipitation of silver, and the silver flakes deposited on the pipe wall are peeled off and coarse particles are mixed in.
In addition, since a silver-ammonia complex aqueous solution with a very low silver concentration is used in order to obtain fine silver particles, not only the production efficiency is low, but also a large amount of liquid is generated, so the loss during recovery increases, and the yield is also low.

Method used

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  • Fine silver particle, process for producing fine silver particle, and apparatus for producing fine silver particle
  • Fine silver particle, process for producing fine silver particle, and apparatus for producing fine silver particle
  • Fine silver particle, process for producing fine silver particle, and apparatus for producing fine silver particle

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no. 1 Embodiment approach

[0122] The silver microparticles of the present invention are silver microparticles produced by reducing silver ions in the presence of halide ions, and are 5.0×10 with respect to silver. -8 ~1.5×10 -3 The molar ratio contains halides, and it is a fine silver particle with good dispersibility.

[0123] 【0032】

[0124] In the method of adding a reducing agent to a silver ion solution to reduce silver ions to precipitate silver fine particles, the silver fine particles of the present invention can be produced by reducing silver ions in the presence of halide ions. In addition, in this production method, by adjusting the halide ion concentration with respect to the silver concentration, the particle size of the precipitated silver fine particles can be controlled.

[0125] 【0033】

[0126] As the silver ion solution, a silver nitrate solution added with ammonia water or the like can be used. Silver-ammonia complexes are formed due to the presence of ammonia, and silver is redu...

no. 2 Embodiment approach

[0151] The method for producing silver microparticles according to the second embodiment has a step of adding a reducing agent to a silver ion solution to reduce silver ions to precipitate silver microparticles, using a combination of a main reducing agent and a sub-reducing agent with a stronger reducing ability than the main reducing agent, and adding a reducing agent to the silver ion solution. In the ionic solution, the main reducing agent is added in the presence of a small amount of secondary reducing agent to precipitate tiny silver particles. By adjusting the addition amount of the secondary reducing agent, the particle size of the precipitated silver microparticles is controlled.

[0152] 【0045】

[0153] As the silver ion solution, a silver nitrate solution added with ammonia water or the like can be used. Silver-ammonia complexes are formed in this solution, and are reduced and precipitated by adding a reducing agent, silver.

[0154] 【0046】

[0155] In the method...

no. 3 Embodiment approach

[0174] The method for producing silver microparticles according to the third embodiment has a step of adding a reducing agent to a silver ion solution to reduce silver ions to precipitate silver microparticles, and by adding silver nanoparticles and reducing silver ions in the presence of the silver nanoparticles, tiny silver particles Microparticles precipitated. By adjusting the amount of silver nanoparticles added to the silver concentration, the particle size of the precipitated silver microparticles can be controlled.

[0175] 【0055】

[0176] As the silver ion solution, a silver nitrate solution added with ammonia water or the like can be used. Silver-ammonia complexes are formed in this solution, and are reduced and precipitated by adding a reducing agent, silver. As the reducing solution, a solution of an organic reducing agent having a phenolic hydroxyl group such as a hydroquinone solution, a pyrogallol solution, or a 3,4-dihydroxyphenol solution can be used.

[01...

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Abstract

Fine silver particles which contain a halogen in an amount of 5.0OE0<-8> to 1.5OE0<-3> mol per mol of the silver. Also provided is a process for producing the fine silver particles which includes a step in which a reducing agent is added to a silver ion solution to reduce the silver ions and thereby precipitate fine silver particles, the silver ion reduction being conducted in the presence of a nucleating substance which constitutes nuclei for the fine silver particles. Furthermore provided is an apparatus for producing the fine silver particles which comprises a silver ion solution tank, a first pipeline connected to the silver ion solution tank, an aqueous-ammonia-solution tank, a second pipeline connected to the aqueous-ammonia-solution tank, a reducing-liquid tank, a third pipeline connected to the reducing-liquid tank, and a fourth pipeline extending from a part where the first and second pipelines cross each other. The apparatus has a constitution in which a reducing liquid supplied through the third pipeline is mixed with a liquid mixture of a silver ion solution and an ammonia solution, the liquid mixture being supplied through the fourth pipeline.

Description

【Technical field】 [0001] 【0001】 [0002] The present invention relates to a method for stably and efficiently producing fine silver particles using a high-concentration silver ion solution, and the silver fine particles. In addition, the present invention relates to a technique for stably and efficiently producing fine silver particles as a technique for producing silver particles by reduction of silver ions. More specifically, the present invention relates to a method for stably and efficiently producing fine, highly dispersible silver particles suitable for use as a paste component of a wiring material or an electrode material of an electronic device, a production apparatus, and the silver microparticles. [0003] This application requires Japanese patent application No. 2007-095657, Japanese patent application No. 2007-095658, Japanese patent application No. 2007-095659, and Japanese patent application No. 2007-095660 filed on March 30, 2007 priority, the content of which...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24
Inventor 樋上晃裕宇野贵博佐藤一祐
Owner MITSUBISHI MATERIALS CORP
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