Silver fine particles and processes and equipment for the production thereof

A preparation device and technology of silver particles, applied in transportation and packaging, metal processing equipment, cable/conductor manufacturing, etc., can solve the problems of low preparation efficiency, falling off of silver flakes, narrowing of flow path, etc., and achieve high preparation efficiency and easy The effect of the maintenance of the device

Inactive Publication Date: 2009-07-29
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this preparation method, since the reduction of the silver ammonium complex is carried out in the pipeline, there are problems such as the narrowing of the flow path due to the precipitation of silver, and the separation of the silver flakes deposited on the tube wall and the contamination of coarse particles.
In addition, due to the use of an aqueous silver ammonia complex solution with a very dilute silver concentration, the preparation efficiency is low

Method used

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  • Silver fine particles and processes and equipment for the production thereof
  • Silver fine particles and processes and equipment for the production thereof
  • Silver fine particles and processes and equipment for the production thereof

Examples

Experimental program
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preparation example Construction

[0045] The first aspect of the preparation method of the present invention is a method for preparing silver microparticles by reducing the silver ammonia complex, wherein, by making the silver ammonia complex aqueous solution and the reducing agent solution merge on the outside of their infusion lines, and in the The open space reduces the silver ammonium complex and precipitates silver particles.

[0046] In the first aspect of the preparation method of the present invention, since the silver particles are deposited in the open space outside the infusion line, the silver particles will not adhere to the surroundings of the deposition site, and there will be no generation of coarse falling particles. Therefore, silver fine particles containing no coarse particles having a particle size of 5 μm or more can be obtained.

[0047] In the first scheme of the preparation method of the present invention, since the silver ammonia complex aqueous solution and the reducing agent solutio...

experiment example 1

[0079] Silver particles were prepared by spray synthesis. Select the spray pressure and nozzle caliber that can form the spray amount shown in Table 1, spray the silver ammonium complex aqueous solution and the reducing agent solution with the same spray amount from the nozzles facing each other at an angle of about 90 °, and make its confluence. Synthesis conditions and results are shown in Table 1. In addition, the electron micrograph (multiplier 7500) of the silver particle of sample A6 is shown in Figure 4 .

experiment example 2

[0081] Silver fine particles were prepared by the outflow synthesis method using a nozzle having a cylindrical outlet. The silver ammonium complex aqueous solution and the reducing agent solution with the concentrations shown in Table 2 flowed out at the same flow rate from the nozzles facing each other at the nozzle angles and distances between the nozzles shown in Table 2, and merged. Synthesis conditions and results are shown in Table 2.

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Abstract

A process for production of silver fine particles which is characterized by making an aqueous silver ammine complex solution and a reducing agent solution meet each other in an open space to reduce the silver ammine complex and deposit silver fine particles, either in which the meeting is conducted by (i) a method of spraying an aqueous silver ammine complex solution and a reducing agent solution through nozzles or (ii) a method of ejecting an aqueous silver ammine complex solution and a reducing agent solution from obliquely downward nozzles opposite to each other to thereby produce silver fine particles which are free form coarse particles having particle sizes of 5[mu]m or above and have a mean particle size of primary particles of 0.08 to 1.0[mu]m and crystallite sizes of 20 to 150nm or in which an aqueous silver ammine complex solution having a silver concentration of 20 to 180g / L and an organic reducing agent solution having a reducing agent concentration of about 0.6 to about 1.4 times the silver concentration by reaction equivalent are used to thereby stably produce silver fine particles having a mean particle size of primary particles of 0.05 to 1.0[mu]m and crystallite sizes of 20 to 150nm.

Description

technical field [0001] The present invention relates to silver microparticles having a suitable particle size excellent in dispersibility and a method for preparing the same, and more specifically, to silver particles having a preferable particle size and high dispersibility as a paste component for forming wiring materials or electrode materials of electronic devices Silver microparticles and methods for their preparation. [0002] This application claims priority based on Japanese Patent Application No. 2006-206742 and Japanese Patent Application No. 2006-206743 filed in Japan on July 28, 2006, and the contents thereof are incorporated herein. Background technique [0003] In recent years, miniaturization and high density of electronic devices are required in order to achieve higher functionality of electronic devices, and in order to achieve finer wiring and electrodes, silver particles used in the paste materials that form them are also required to have Finer and highly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24H01B13/00
CPCB22F1/0044B22F2009/088B22F9/24B22F2998/00Y10T428/2982B22F1/07B22F1/00B22F1/054B22F1/056B22F9/04H01B13/00
Inventor 久芳完治樋上晃裕宇野贵博
Owner MITSUBISHI MATERIALS CORP
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