Method for producing silver microparticles

A manufacturing method and technology of silver particles, applied in transportation and packaging, photovoltaic power generation, metal processing equipment, etc., can solve the problems of silver particle shape and property change, seriousness, precipitation, etc., and achieve sufficient continuous production and quality uniformity Effect

Pending Publication Date: 2022-07-08
M TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, in order to mass-produce uniform silver particles, in the case of continuous production of silver particles, even if a forced thin-film reactor is used, from the beginning of production, as time passes, silver will migrate to the processing surface. Adhesion, as a result, there is a problem that the shape and properties of the generated silver particles change
In particular, when the concentration of silver in the fluid containing the silver compound is increased in pursuit of mass production, precipitation is more likely to occur and the problem becomes more serious

Method used

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  • Method for producing silver microparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] By adding 250 parts of silver nitrate (manufactured by Kishida Chemical Co., Ltd.) as a silver compound, 111 parts of glycine (manufactured by Kanto Chemical Co., Ltd.) as an amino acid (with respect to 1 mol of silver) to 9589 parts of ion-exchanged water ion is 1 mol) and 50 parts of 60% nitric acid (manufactured by Kishida Chemical Co., Ltd.) as a pH adjuster, and dissolved in an air atmosphere at 25°C to obtain a silver compound aqueous solution (1).

[0075] By adding 150 parts of hydrazine monohydrate (manufactured by Kanto Chemical Co., Ltd.) as a reducing agent and 5 parts of a 10% methanol solution of oleic acid as a dispersant to 845 parts of ion-exchanged water, the dispersant was prepared by adding oleic acid ( (manufactured by Kanto Chemical Co., Ltd.) was dissolved in methanol, and dissolved in an air atmosphere of 25° C. to obtain an aqueous reducing agent solution (1).

[0076] Using a forced thin film reactor ULREA (manufactured by M Technique Co., Ltd....

Embodiment 2

[0080] By adding 250 parts of silver nitrate (manufactured by Kishida Chemical Co., Ltd.) as a silver compound, 52 parts of L-arginine (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) as an amino acid to 9693 parts of ion-exchanged water ) (0.2 mol per 1 mol of silver ions) and 5 parts of 60% nitric acid (manufactured by Kishida Chemical Co., Ltd.) as a pH adjuster, and dissolved in an air atmosphere at 25° C. to obtain a silver compound Aqueous solution (2).

[0081] By adding 100 parts of hydrazine monohydrate (manufactured by Kanto Chemical Co., Ltd.) as a reducing agent and 5 parts of a 10% methanol solution of oleic acid as a dispersant to 895 parts of ion-exchanged water, the dispersant was prepared by adding oleic acid ( (manufactured by Kanto Chemical Co., Ltd.) was prepared by dissolving in methanol, and dissolved in an air atmosphere of 25° C. to obtain an aqueous reducing agent solution (2).

[0082] Using a forced thin film reactor ULREA (manufacture...

Embodiment 3

[0086] By adding 250 parts of silver nitrate (manufactured by Kishida Chemical Co., Ltd.) as a silver compound, 243 parts of L-phenylalanine (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) as an amino acid to 9502 parts of ion-exchanged water manufacture) (1 mol relative to 1 mol of silver ions) and 5 parts of 60% nitric acid (manufactured by Kishida Chemical Co., Ltd.) as a pH adjuster, and dissolved in an air atmosphere at 25° C. to obtain a silver compound Aqueous solution (3).

[0087] By adding 225 parts of hydrazine monohydrate (manufactured by Kanto Chemical Co., Ltd.) as a reducing agent and 5 parts of a 10% methanol solution of oleic acid as a dispersant to 770 parts of ion-exchanged water, the dispersant was prepared by adding oleic acid ( (manufactured by Kanto Chemical Co., Ltd.) was prepared by dissolving in methanol, and dissolved in an air atmosphere of 25° C. to obtain an aqueous reducing agent solution (3).

[0088] Using a forced thin film rea...

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Abstract

The present invention relates to a method for producing silver microparticles, in which silver microparticles are precipitated by introducing and mixing at least two fluids from different flow paths to continuously reduce silver ions contained in a silver compound; the method is characterized in that in the at least two fluids, one fluid contains the silver compound, the other fluid contains a reducing agent, and at least one fluid in the at least two fluids contains amino acid. According to the present invention, it is possible to provide a method for producing silver microparticles, which has sufficient continuous productivity and quality uniformity, and which does not have the problem of mine explosion of silver, such as deterioration of the working environment and the generation of explosiveness due to the use of a large amount of ammonia.

Description

technical field [0001] The present invention relates to a method for producing silver particles. Background technique [0002] In recent years, in applications such as solar cells, displays, and sensors, improvements in patterning techniques for conductive members are required. Since silver has high conductivity and oxidation resistance, it is widely used as a conductive material for wiring, electrodes, and the like. In order to realize the miniaturization of wirings and electrodes, the silver fine particles used in the paste for forming them need to have an appropriate small particle size, especially a uniform particle size. In addition, from an economical point of view, high productivity is required in the production of silver fine particles. [0003] A wet reduction method (liquid phase reduction method) in which silver ions are reduced by a chemical method is the mainstream as a method for producing silver fine particles for a paste for forming wirings and electrodes. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24B22F1/05B22F1/107C22C1/0466B22F2301/255
Inventor 竹田一贵远藤健司
Owner M TECH CO LTD
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