JPS61223111A - Production of fine silver powder - Google Patents
Production of fine silver powderInfo
- Publication number
- JPS61223111A JPS61223111A JP6451385A JP6451385A JPS61223111A JP S61223111 A JPS61223111 A JP S61223111A JP 6451385 A JP6451385 A JP 6451385A JP 6451385 A JP6451385 A JP 6451385A JP S61223111 A JPS61223111 A JP S61223111A
- Authority
- JP
- Japan
- Prior art keywords
- silver powder
- fine silver
- particle size
- size distribution
- silver nitrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は微細な銀粉末の製造方法に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for producing fine silver powder.
（従来技術とその問題点）
従来、銀微粉末の製造方法としては親水性のガラス容器
中でアンモニア性硝酸銀錯体溶液をブドウ糖で還元する
方法が用いられてきた。(Prior art and its problems) Conventionally, as a method for producing fine silver powder, a method has been used in which an ammoniacal silver nitrate complex solution is reduced with glucose in a hydrophilic glass container.
ところが、この反応は代表的な銀鏡反応であるため析出
反応が親水性の容器の壁で起きるため凝集した粒度分布
の幅の広い銀粉末しか得られないという欠点を有してい
た。However, since this reaction is a typical silver mirror reaction, the precipitation reaction occurs on the walls of a hydrophilic container, so it has the disadvantage that only aggregated silver powder with a wide particle size distribution can be obtained.
本発明は上記の欠点を解消せんがためになされたもので
あり、分散した粒度分布の狭い微細な銀粉末の製造方法
を提供せんとするものである。The present invention has been made to solve the above-mentioned drawbacks, and aims to provide a method for producing fine silver powder having a narrow particle size distribution.
（問題点を解決するための手段）
本発明はアンモニア性硝酸銀錯体溶液を、還元剤を用い
てｌＫ微粉末を製造する方法において、反応槽内面を疎
水性に保つことにより微細な銀粉末を得ることを特徴と
するものである。(Means for Solving the Problems) The present invention is a method for producing lK fine powder from an ammoniacal silver nitrate complex solution using a reducing agent, by keeping the inner surface of the reaction tank hydrophobic. It is characterized by obtaining.
そして本発明の製造方法において、反応槽内面を疎水性
に保つ理由は、親水性の場合、析出反応が容器の壁で起
きるため凝集した、粒度分布の幅の広い銀粉末しか得ら
れないため、反応槽内面を疎水性に保つことによって析
出反応を水溶液中で均一に起こすことができるようにな
るためである。In the production method of the present invention, the reason why the inner surface of the reaction tank is kept hydrophobic is that if it is hydrophilic, the precipitation reaction will occur on the wall of the container, so only aggregated silver powder with a wide particle size distribution can be obtained. This is because by keeping the inner surface of the reaction tank hydrophobic, the precipitation reaction can occur uniformly in the aqueous solution.
本発明において反応槽内面を疎水性に保つ方法としては
、オイルコーティング、界面活性剤コーティング、テフ
ロンコーティング等である。In the present invention, methods for keeping the inner surface of the reaction tank hydrophobic include oil coating, surfactant coating, Teflon coating, and the like.
ここで、本発明による実施例及び従来例について説明す
る。Here, an embodiment according to the present invention and a conventional example will be described.
（実施例１）
ブドウ糖５０ｇを５０℃の水５０ｍ１に溶解しこの水溶
液をシリコーンオイルコーティングしたビーカー中で攪
拌しておく。また、別のビーカーで硝酸銀５ｇを１０ｍ
１の水に溶解し、これに２％アンモニア水４ｍｌを加え
てアンモニア性硝酸銀錯体溶液とし、これを先のブドウ
糖溶液中に徐々に添加する。得られた銀微粉末はデカン
テーションにより充分に水で洗浄して、粒度分布測定及
び電子顕微鏡観察を行なったところ、平均粒径１゜μｍ
で、粒度分布は図のように幅の狭いもので、形状はほぼ
球形で分散したものであった。(Example 1) 50 g of glucose is dissolved in 50 ml of water at 50° C., and this aqueous solution is stirred in a beaker coated with silicone oil. Also, in another beaker, add 5 g of silver nitrate to 10 m
1 of water, add 4 ml of 2% ammonia water to obtain an ammoniacal silver nitrate complex solution, and gradually add this to the above glucose solution. The obtained fine silver powder was thoroughly washed with water by decantation, and particle size distribution measurement and electron microscope observation revealed that the average particle size was 1゜μm.
The particle size distribution was narrow as shown in the figure, and the shape was almost spherical and dispersed.
（実施例２）
ブドウ＠７０ｇを５０℃の水７０ｍ１に溶解しこの水溶
液をテフロンビーカー中で攪拌しておく。(Example 2) 70 g of grapes were dissolved in 70 ml of water at 50° C., and this aqueous solution was stirred in a Teflon beaker.
また、別のビーカーで硝酸銀６ｇを１２ｍ１の水に溶解
し、これに２８％アンモニア水５ｍｌを加えてアンモニ
ア性硝酸銀錯体溶液とし、これを先のブドウ糖溶液中に
徐々に添加する。得られた銀微粉末はデカンテーション
により充分に水で洗浄して、粒度分布測定及び電子顕微
鏡観察を行ったところ、平均粒径０．８μｍで、粒度分
布は図のように幅の狭いもので、形状はほぼ球形で分散
したものであった。Further, in another beaker, 6 g of silver nitrate is dissolved in 12 ml of water, and 5 ml of 28% aqueous ammonia is added thereto to obtain an ammoniacal silver nitrate complex solution, which is gradually added to the glucose solution. The obtained fine silver powder was thoroughly washed with water by decantation, and particle size distribution measurement and electron microscope observation revealed that the average particle size was 0.8 μm, and the particle size distribution was narrow as shown in the figure. The shape was almost spherical and dispersed.
８ （従来例）
ブドウＩＮ ５０ ｇを５０℃の水５ Ｑｍｌに溶解し
この水溶液をガラスビーカー中で攪拌しておく。8 (Conventional example) 50 g of Grape IN was dissolved in 5 Qml of water at 50°C, and this aqueous solution was stirred in a glass beaker.
また、別のビーカーで硝酸銀５ｇを１０ｍ１の水に溶解
し、これに２８％アンモニア水４ｍｌを加ｌ えてア
ンモニア性硝酸銀錯体溶液とし、これを先のブドウ１１
溶液中に徐々に添加する。得られた銀粉末はデカンテー
ションにより充分に水で洗浄して、粒度分布測定及び電
子顕微鏡観察を行ったところ、平均粒径５．２μｍで、
粒度分布は図のように幅の広い、凝集したものであった
。In addition, in another beaker, dissolve 5 g of silver nitrate in 10 ml of water, add 4 ml of 28% ammonia water to this to make an ammoniacal silver nitrate complex solution, and add this to the grape 11 described above.
Add gradually into the solution. The obtained silver powder was thoroughly washed with water by decantation, and particle size distribution measurement and electron microscope observation revealed that the average particle size was 5.2 μm.
The particle size distribution was wide and aggregated as shown in the figure.
（発明の効果）
上記の説明で明らかなように本発明の製造方法はアンモ
ニア性硝酸銀錯体溶液を、還元剤を用いて銀微粉末を製
造する方法において、反応槽内面を疎水性に保つことに
より、従来法では得られなかった。分散した粒度分布の
狭い微細な銀粉末を製造できるので、従来の製造法にと
って代わることのできる画期的なものと言える。(Effects of the Invention) As is clear from the above explanation, the production method of the present invention is a method for producing fine silver powder from an ammoniacal silver nitrate complex solution using a reducing agent, in which the inner surface of the reaction tank is kept hydrophobic. Therefore, it could not be obtained using conventional methods. Since it is possible to produce fine, dispersed silver powder with a narrow particle size distribution, it can be said to be an epoch-making method that can replace conventional production methods.
図は光透過式粒度分布測定装置を用いて各、銀微粉末の
粒度分布を測定した結果を横軸に粒径、縦軸に累積パー
セントを取って示したものである。
出願人 田中貴金属工業株式会社
ａ浸（、ｇｍ）The figure shows the results of measuring the particle size distribution of each fine silver powder using a light transmission type particle size distribution measuring device, with the horizontal axis representing the particle size and the vertical axis representing the cumulative percentage. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.
Claims (1)
末を製造する方法において、反応槽内面を疎水性に保つ
ことを特徴とする銀微粉末の製造方法。A method for producing fine silver powder using an ammoniacal silver nitrate complex solution using a reducing agent, the method comprising maintaining the inner surface of a reaction vessel hydrophobic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6451385A JPS61223111A (en) | 1985-03-28 | 1985-03-28 | Production of fine silver powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6451385A JPS61223111A (en) | 1985-03-28 | 1985-03-28 | Production of fine silver powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61223111A true JPS61223111A (en) | 1986-10-03 |
Family
ID=13260361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6451385A Pending JPS61223111A (en) | 1985-03-28 | 1985-03-28 | Production of fine silver powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61223111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268988A (en) * | 2015-10-26 | 2016-01-27 | 昆明理工大学 | Method for preparing ultrafine spherical silver powder |
-
1985
- 1985-03-28 JP JP6451385A patent/JPS61223111A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105268988A (en) * | 2015-10-26 | 2016-01-27 | 昆明理工大学 | Method for preparing ultrafine spherical silver powder |
| CN105268988B (en) * | 2015-10-26 | 2018-03-06 | 昆明理工大学 | A kind of preparation method of superfine spherical silver powder |
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