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Method for manufacturing highly crystalline silver particles

A manufacturing method and technology for silver particles, which are applied in the directions of transportation, packaging, metal processing equipment, etc., can solve the problems of difficulty in making and cannot obtain silver particles with high crystallinity, and achieve the effect of improving production efficiency.

Pending Publication Date: 2019-09-13
M TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, there is a problem that a large number of seed crystals are generated, polycrystals are formed due to the influence of diffusion to the uneven surface, etc., and highly crystalline silver particles close to single crystals cannot be obtained.
However, in the treatment method disclosed in Patent Document 6, in order to increase the speed of the reduction reaction of silver particles, ethylene glycol, which exhibits reducing properties for silver, is used as the main solvent of the silver solution. Therefore, there is still the following problem: a large amount of Seed crystals, it is difficult to produce silver particles with a primary particle size of 100 nm or more and a ratio of the average crystallite size to the average primary particle size of 80% or more

Method used

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  • Method for manufacturing highly crystalline silver particles
  • Method for manufacturing highly crystalline silver particles
  • Method for manufacturing highly crystalline silver particles

Examples

Experimental program
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Effect test

Embodiment 1

[0080] use image 3 In the fluid processing device described in Patent Documents 5 and 6, the silver solution and the reducing agent solution of the formula shown in Table 1 are arranged in opposite directions, at least one side is opposite to the other side The film-like space formed between the two processing surfaces 1 and 2 that rotate relatively is mixed as a thin-film fluid, and silver particles are deposited in the thin-film fluid. Specifically, the silver solution was fed from the center as the first fluid (main flow) at a supply pressure of 0.50 MPaG. 1st fluid delivery to image 3 The airtight film-like space (between the processing surfaces) between the processing surface 1 of the processing member 10 and the processing surface 2 of the processing member 20. Table 2 shows the rotational speed of the processing member 10 as the operating conditions. The first fluid forms a forced thin film fluid between the processing surfaces 1 and 2 and is sprayed from the outer...

Embodiment 2

[0114] The reducing agent solution and the silver solution of the formula shown in Table 1 were mixed under the treatment conditions shown in Table 2, except that it was used in the same manner as in Example 1. image 3 In the fluid processing device shown, silver fine particles were obtained by the same method as in Example 1. The results are shown in Table 3.

[0115] From Table 3, it was confirmed that even under the conditions of Example 2, silver fine particles having a reduction rate of 99% or more could be produced with the above-mentioned d / D being 80% or more.

Embodiment 3

[0120] Use in the same way as Example 1 image 3 In the fluid treatment device shown, the silver solution of the formula shown in Table 1 and the reducing agent solution were mixed under the treatment conditions shown in Table 2, except that silver particles were obtained in the same way as in Example 1. .

[0121] From Table 3, it was confirmed that even under the conditions of Example 3, it was possible to produce the silver fine particles having the above-mentioned d / D of 80% or more at a reduction rate of 99% or more.

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Abstract

The present invention is a method for manufacturing fine silver particles by reduction reaction, wherein the method for manufacturing highly crystalline silver particles is characterized in that: a silver solution that includes at least silver ions and a reducing solution that includes at least a reducing agent are made to react by a continuous wet reduction method; fine silver particles are madeto precipitate; the reduction rate from the silver solution to the fine silver particles is at least 99%; the average primary particle diameter of the fine silver particles is in the range 100-1000 nm; and the average crystal diameter is at least 80% of the average primary particle diameter of the fine silver particles. The present invention makes it possible to continuously obtain, by a liquid-phase method, fine silver particles with a ratio (d / D) of the average crystal diameter (d) to the average primary particle diameter (D) being at least 95%, i.e., all of the fine silver particles are close to being single crystals.

Description

technical field [0001] The present invention relates to a method for producing highly crystalline silver particles. Background technique [0002] Silver has antibacterial and bactericidal effects and excellent electrical conductivity, so it is used in a wide range of fields such as the medical field and electronic device materials. In addition, by micronizing silver, functions such as lowering of the melting point that cannot be recognized in a bulk state are exhibited, and thus its use is further expanded. [0003] In particular, regarding silver fine particles utilized as electronic device materials, cracks accompanying sintering, migration due to conduction, and the like are regarded as problems, and highly crystalline silver fine particles effective for these problems are required. [0004] Among them, silver fine particles of 100 nm or less are suitable for use in drawing fine wiring and the like by utilizing the above-mentioned lowering of the melting point. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B22F9/20B22F1/05B22F1/0545
CPCB22F9/24C22C1/0466C22C5/06B22F1/0545B22F1/05B22F2301/255B22F1/07B22F2304/058
Inventor 邨田康成榎村真一
Owner M TECH CO LTD
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