JPS61223110A - Production of ultrafine silver particle - Google Patents
Production of ultrafine silver particleInfo
- Publication number
- JPS61223110A JPS61223110A JP6451285A JP6451285A JPS61223110A JP S61223110 A JPS61223110 A JP S61223110A JP 6451285 A JP6451285 A JP 6451285A JP 6451285 A JP6451285 A JP 6451285A JP S61223110 A JPS61223110 A JP S61223110A
- Authority
- JP
- Japan
- Prior art keywords
- silver particles
- reaction vessel
- ultrafine silver
- hydrophobic
- reducing
- 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、超微細な銀粒子の製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for producing ultrafine silver particles.
（従来技術とその問題点）
従来、銀超微粒子の製造方法としては、真空容器内で原
料の銀を溶解して、蒸発した煙状の銀微粉末を回収する
方法が用いられてきた。ところがこの方法は、発生量が
少ない上に、溶湯の温度コントロールが難かしいために
粒度分布が広くなりかつ、個々の粒子がチェーン状にな
っているために単分散粒子が得られないという欠点を有
していた。(Prior art and its problems) Conventionally, as a method for producing ultrafine silver particles, a method has been used in which raw material silver is dissolved in a vacuum container and evaporated smoky fine silver powder is recovered. However, this method has the disadvantage that the amount generated is small, the particle size distribution is wide because it is difficult to control the temperature of the molten metal, and monodisperse particles cannot be obtained because the individual particles are chain-shaped. had.
（発明の目的）
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、粒径のそろった単分散した銀超微粒子を大量に製
造する方法を提供せんとするものである。(Objective of the Invention) The present invention has been made to solve the above-mentioned drawbacks, and it is an object of the present invention to provide a method for producing a large amount of monodispersed ultrafine silver particles having uniform particle sizes.
（問題点を解決するための手段）
本発明は疎水性反応槽内で還元剤を用いてアンモニア性
硝酸銀錯体溶液を還元して銀超微粒子を製造する方法に
おいて、反応溶液中に保護コロイドを添加することによ
って単分散した銀超微粒子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 ultrafine silver particles by reducing an ammoniacal silver nitrate complex solution using a reducing agent in a hydrophobic reaction tank, in which a protective colloid is added to the reaction solution. This method is characterized by obtaining monodispersed ultrafine silver particles.
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。The reason why the inner surface of the reaction tank is kept hydrophobic in the production method of the present invention 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.
また、反応溶液中に保護コロイドを添加する理由は、ア
ンモニア性硝酸銀錯体溶液を還元することによって水溶
液中に析出した銀超微粒子が凝集しないで単分散状態を
保つようにするためである。Further, the reason why a protective colloid is added to the reaction solution is to prevent the ultrafine silver particles precipitated in the aqueous solution by reducing the ammoniacal silver nitrate complex solution from agglomerating and to maintain a monodisperse state.
本発明において反応槽内面を疏水性に保つ方法と１
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り、また反応溶
液中に添加する保護コロイドとしては、ゼラチン、アラ
ビアゴム、アルブミン、ポリビニルアルコール等である
。Method for keeping the inner surface of a reaction tank hydrophobic in the present invention, and 1
Examples include oil coating, surfactant coating, Teflon coating, etc., and protective colloids added to the reaction solution include gelatin, gum arabic, albumin, polyvinyl alcohol, etc.
（実施例） ここで本発明の実施例について説明する。(Example) Examples of the present invention will now be described.
実施例１
ブドウ１１２０ｇとゼラチン０．１ｇを５０℃の水５０
ｍ１に溶解し、この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（。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＋ゼラチン溶液中に１滴（約０
．０５ ｍ ｌ ）添加すると溶液の色が濃赤色に変化
し、銀超微粒子が析出した。得られた銀超微粒子を透過
型電子顕微鏡で観察した結果、平均粒径８０人の単分散
した球形粒子であった。Example 1 1120g of grapes and 0.1g of gelatin were mixed with 50℃ of water at 50°C.
This solution was stirred in a beaker coated with silicone oil.In another beaker, 5 g of silver nitrate was dissolved in 10 ml of water, and 4 ml of 28% aqueous ammonia was added thereto to prepare the ammoniacal silver nitrate complex. Make a solution and add 1 drop (approximately 0.0
．． 05 ml), the color of the solution changed to deep red and ultrafine silver particles precipitated. When the obtained ultrafine silver particles were observed using a transmission electron microscope, they were found to be monodispersed spherical particles with an average particle size of 80 mm.
実施例２
ブドウＷ５００ｇとポリビニルアルコール０．５ｇを５
０℃の水１．０００ｍ１に溶解し、この溶液を界面活性
剤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１０ｇ’ｆ： １０ ｍ ｌの水
に溶解し、これに２８％アンモニア水８ｍｌ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＋
ポリビニルアルコール溶液中に１滴（約０．１ ｍ ｌ
）添加すると溶液の色が濃赤色に変化し、銀超微粒子
が析出した。Example 2 500g of grape W and 0.5g of polyvinyl alcohol
Dissolve in 1.000 ml of water at 0° C. and stir this solution in a surfactant-coated beaker. Also,
In another beaker, dissolve 10 g'f of silver nitrate in 10 ml of water, add 8 ml of 28% ammonia water to make an ammoniacal silver nitrate complex solution, and add this to the glucose +
1 drop (approximately 0.1 ml
) When added, the color of the solution changed to deep red, and ultrafine silver particles precipitated.
得られた銀超微粒子を透過型電子顕微鏡で観察した結果
、平均粒径１００人の単分散した球形粒子であった。As a result of observing the obtained ultrafine silver particles using a transmission electron microscope, they were found to be monodispersed spherical particles with an average particle size of 100.
（従来例）
ガラス製の真空容器内に設置しであるバスケット型タン
グステンヒーターの上に原料の銀を置きこの真空容器内
を５Ｘ１０−’Ｔｏｒｒまで真空に引いた後、バスケッ
ト型タングステンヒーターに通電し、銀を溶解すると溶
湯の表面から煙状の銀微粉末が発生した。(Conventional example) After placing the raw material silver on top of a basket-type tungsten heater installed in a glass vacuum container and evacuating the inside of this vacuum container to 5 x 10-' Torr, electricity is applied to the basket-type tungsten heater. When silver was melted, fine smoke-like silver powder was generated from the surface of the molten metal.
得られた銀超微粒子を透過型電子顕微鏡で観察した結果
、平均粒径１５０人で粒度分布の広いチェーン状の粒子
であった。When the obtained ultrafine silver particles were observed using a transmission electron microscope, they were found to be chain-shaped particles with an average particle size of 150 mm and a wide particle size distribution.
（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、疏水
性反応槽内で還元剤を用いてアンモニア性硝酸銀錯体溶
液を還元して銀超微粒子を製造する方法において、反応
溶液中に保護コロイドを添加することにより、従来法で
は得られなかった単分散した根部徽粒子を簡単に製造で
きるので、従来の製造方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 ultrafine silver particles by reducing an ammoniacal silver nitrate complex solution using a reducing agent in a hydrophobic reaction tank. By adding a protective colloid to the solution, it is possible to easily produce monodispersed root particles that cannot be obtained using conventional methods, so it can be said to be an epoch-making method that can replace conventional production methods.
Claims (1)
体溶液を還元し銀超微粒子を製造する方法において、反
応溶液中に保護コロイドを添加することによって、単分
散した銀超微粒子を得ることを特徴とする銀超微粒子の
製造方法In a method for producing ultrafine silver particles by reducing an ammoniacal silver nitrate complex solution using a reducing agent in a hydrophobic reaction tank, it is possible to obtain monodispersed ultrafine silver particles by adding a protective colloid to the reaction solution. Characteristic method for producing ultrafine silver particles
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6451285A JPS61223110A (en) | 1985-03-28 | 1985-03-28 | Production of ultrafine silver particle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6451285A JPS61223110A (en) | 1985-03-28 | 1985-03-28 | Production of ultrafine silver particle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61223110A true JPS61223110A (en) | 1986-10-03 |
Family
ID=13260329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6451285A Pending JPS61223110A (en) | 1985-03-28 | 1985-03-28 | Production of ultrafine silver particle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61223110A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005053885A1 (en) * | 2003-12-01 | 2005-06-16 | Kojima Chemicals Co., Ltd. | Process for producing metal micropowder having particle diameter uniformalized |
| CN110592959A (en) * | 2019-08-27 | 2019-12-20 | 台州市旭泓服饰有限公司 | Self-cleaning textile material for automotive interior and preparation method thereof |
-
1985
- 1985-03-28 JP JP6451285A patent/JPS61223110A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005053885A1 (en) * | 2003-12-01 | 2005-06-16 | Kojima Chemicals Co., Ltd. | Process for producing metal micropowder having particle diameter uniformalized |
| JPWO2005053885A1 (en) * | 2003-12-01 | 2007-06-28 | 小島化学薬品株式会社 | Method for producing fine metal powder with uniform particle size |
| JP4861701B2 (en) * | 2003-12-01 | 2012-01-25 | 小島化学薬品株式会社 | Method for producing fine metal powder with uniform particle size |
| CN110592959A (en) * | 2019-08-27 | 2019-12-20 | 台州市旭泓服饰有限公司 | Self-cleaning textile material for automotive interior and preparation method thereof |
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