JPH01104340A - Manufacture of silver colloid - Google Patents

Manufacture of silver colloid

Info

Publication number
JPH01104340A
JPH01104340A JP26050687A JP26050687A JPH01104340A JP H01104340 A JPH01104340 A JP H01104340A JP 26050687 A JP26050687 A JP 26050687A JP 26050687 A JP26050687 A JP 26050687A JP H01104340 A JPH01104340 A JP H01104340A
Authority
JP
Japan
Prior art keywords
silver
colloid
solution
added
mixing
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
Application number
JP26050687A
Other languages
Japanese (ja)
Inventor
Hiroshi Makino
洋 牧野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tanaka Kikinzoku Kogyo KK
Original Assignee
Tanaka Kikinzoku Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tanaka Kikinzoku Kogyo KK filed Critical Tanaka Kikinzoku Kogyo KK
Priority to JP26050687A priority Critical patent/JPH01104340A/en
Publication of JPH01104340A publication Critical patent/JPH01104340A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To produce stable, fine silver colloid by mixing a reducing agent to which protective colloid has been added and an aqueous solution of silver nitrate whose pH has been adjusted at a temperature of 100 deg.C or less. CONSTITUTION:Aqueous solutions of protective colloid such as gelatine, gum arabic etc. are added to aqueous solutions of D-erythorbic acids or salts of D-erythorbic acids, as reducing agents, to be mixed with each other. On the other hand, after silver nitrate is dissolved in water, pH of which is adjusted in the range of 0.1-7, and further, when necessary, protective colloid is added thereto. By mixing these two solutions at a time and mixing them at a temperature of 100 deg.C or less, silver colloid in a state of fine and stable dispersion is produced.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は安定な銀コロイド溶液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 a stable silver colloid solution.

(従来の技術とその問題点) 従来、銀コロイドの製造方法としては硝酸銀水溶液にア
ンモニア水を加えて銀のアンモニウム錯体を作り、これ
をホルマリンで還元する方法が用いられてきた。ところ
が、この方法では析出した銀粒子が比較的大きいために
コロイド分散が不安定であり、凝集による銀の沈殿を生
じやすいという欠点を有していた。
(Prior art and its problems) Conventionally, as a method for producing silver colloid, a method has been used in which aqueous ammonia is added to an aqueous solution of silver nitrate to form an ammonium complex of silver, and this is reduced with formalin. However, this method has the drawback that colloidal dispersion is unstable because the precipitated silver particles are relatively large, and silver precipitation due to aggregation is likely to occur.

(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、安定な銀コロイドの製造方法を提供せんとするも
のである。
(Object of the Invention) The present invention has been made to solve the above-mentioned drawbacks, and aims to provide a method for producing a stable silver colloid.

(問題点を解決するための手段) 本発明は硝酸銀水溶液を還元して銀コロイドを製造する
方法において、還元剤としてのD−エリソルビン酸又は
D−エリソルビン酸塩類溶液又はPH−t−0,1〜7
に調整した硝酸銀水溶液のいずれか又は両方に保護コロ
イドを添加し、次いで上記2つの溶液を100℃以下に
て混合することにより安定な銀コロイドを得ることを特
徴とするものである。
(Means for Solving the Problems) The present invention provides a method for producing silver colloid by reducing an aqueous silver nitrate solution, in which D-erythorbic acid or a D-erythorbic acid salt solution or PH-t-0,1 is used as a reducing agent. ~7
A stable silver colloid is obtained by adding a protective colloid to either or both of the aqueous silver nitrate solutions prepared in the following manner, and then mixing the two solutions at 100° C. or lower.

(作用) 而して本発明の製造方法において、D−エリソルビン酸
及びD−エリソルビン酸塩類を用いる理由は、これらの
酸化還元電位が硝酸銀水溶液を還元するのに適当である
ためである。
(Function) The reason why D-erythorbic acid and D-erythorbic acid salts are used in the production method of the present invention is that their redox potential is suitable for reducing an aqueous silver nitrate solution.

また硝酸銀水溶液のPHを0.1〜7にする理由は、P
Hが0.1より低いと反応が遅く、7よりも高いと銀の
酸化物が生成するためである。また2つの溶液の混合を
100℃以下にて行う理由は、100℃を超えると、粒
子同士の凝集が激しくなるためである。また、反応溶液
中に保護コロイドを添加する理由は、硝酸銀溶液を還元
することによって水溶液中に析出する銀粒子が大きくな
ることを防ぎ、また粒子同士が凝集して銀の沈殿を生じ
ないようコロイド分散を安定に保つようにするためであ
る。
The reason for setting the pH of the silver nitrate aqueous solution to 0.1 to 7 is that P
This is because when H is lower than 0.1, the reaction is slow, and when H is higher than 7, silver oxide is produced. The reason why the two solutions are mixed at a temperature of 100°C or lower is that if the temperature exceeds 100°C, the particles will become more agglomerated. In addition, the reason why a protective colloid is added to the reaction solution is to prevent the silver particles precipitated in the aqueous solution from increasing in size by reducing the silver nitrate solution, and to prevent the particles from coagulating with each other and causing silver precipitation. This is to keep the dispersion stable.

本発明の請求範囲においてD−エリソルビン酸塩類とし
ては、ナトリウム塩、カリウム塩、アンモニウム塩等は
問わない。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、プロタル
ピン酸、リサルピン酸等を問わない。
In the scope of the present invention, D-erythorbate salts include sodium salts, potassium salts, ammonium salts, and the like. Further, the protective colloid to be added to the reaction solution may be gelatin, gum arabic, albumin, protalpic acid, resalpic acid, or the like.

(実施例1) D−エリソルビン酸12gを水に溶解して100mρに
し、この溶液に保護コロイドゼラチン水溶液を300d
添加してテフロンコーティングしたビーカーの中で溶液
温度を20℃に保ち撹拌しておく。また別のビーカーで
硝酸銀16gを水に溶解し、500戚にした後、PHを
2に調整し、溶液温度を20’Cにする。これを先のD
−エリソルビン酸+ゼラチン溶液中に一度に添加して7
分間撹拌した。得られた銀コロイドは透過型電子顕微鏡
で観察を行った。その結果、平均粒径220人で非常に
安定に分散した銀コロイドであった。
(Example 1) 12 g of D-erythorbic acid was dissolved in water to make 100 mρ, and 300 d of a protective colloid gelatin aqueous solution was added to this solution.
The temperature of the solution was maintained at 20° C. and stirred in a Teflon-coated beaker. In another beaker, dissolve 16g of silver nitrate in water to make the solution 500%, adjust the pH to 2, and bring the solution temperature to 20'C. This is the previous D
- Added at once to erythorbic acid + gelatin solution
Stir for a minute. The obtained silver colloid was observed using a transmission electron microscope. As a result, the silver colloid was very stably dispersed with an average particle size of 220 mm.

(実施例2) D−エリソルビン酸9gを水に溶解して100滅にし、
この溶液に保護コロイドアラビアゴム水溶液を300戚
添加してテフロンコーティングしたビーカーの中で溶解
温度を30℃に保ち撹拌しておく。
(Example 2) 9 g of D-erythorbic acid was dissolved in water to 100%
To this solution, 300% of aqueous solution of protective colloid gum arabic is added and stirred in a Teflon-coated beaker while maintaining the dissolution temperature at 30°C.

また別のビーカーで硝酸銀10gを水に溶解し、500
成にした後、PHを4に調整し、溶液温度を30℃にす
る。これを先のD−エリソルビン酸+アラビアゴム溶液
中に一度に添加して7分間撹拌した。
In another beaker, dissolve 10g of silver nitrate in water,
After the temperature is reached, the pH is adjusted to 4 and the solution temperature is set to 30°C. This was added at once to the above D-erythorbic acid + gum arabic solution and stirred for 7 minutes.

得られた銀コロイドは透過型電子顕微鏡で観察を行った
。その結果、平均粒径200人で非常に安定に分散した
銀コロイドであった。
The obtained silver colloid was observed using a transmission electron microscope. As a result, the silver colloid was very stably dispersed with an average particle size of 200 particles.

(従来例) 硝酸銀15gを1007の水に溶解し、これに28%の
アンモニア水を加え、銀のアンモニウム錯体溶液とし、
この溶液をホルマリンで還元して銀コロイドを作った。
(Conventional Example) Dissolve 15g of silver nitrate in 1007 water, add 28% aqueous ammonia to this to make a silver ammonium complex solution,
This solution was reduced with formalin to produce silver colloid.

得られた恨コロイドは透過型電子顕微鏡観察を行った。The obtained colloid was observed using a transmission electron microscope.

その結果この恨コロイドは平均粒径は400人でありし
かも一昼夜放置した後凝集により銀の沈殿を生じた。
As a result, this colloid had an average particle size of 400 particles, and after being left for a day and night, it coagulated and produced silver precipitation.

(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硝酸銀
水溶液を還元して銀コロイドを製造する方法において還
元剤としてのD−エリソルビン酸又はD−エリソルビン
酸塩類溶液又はPHを0.1〜7に調整した硝酸銀水溶
液のいずれか又は両方に保護コロイドを添加し、次いで
上記2つの溶液を100℃以下にて混合することにより
従来法では得られなかった安定で微細な銀コロイドを製
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いえる。
(Effects of the Invention) As is clear from the above explanation, the production method of the present invention uses D-erythorbic acid, a D-erythorbate salt solution, or PH as a reducing agent in the method of producing silver colloid by reducing an aqueous silver nitrate solution. By adding a protective colloid to one or both of silver nitrate aqueous solutions adjusted to 0.1 to 7, and then mixing the two solutions above at 100°C or less, stable and fine silver colloids that could not be obtained by conventional methods can be obtained. It can be said that it is an epoch-making method that can replace conventional manufacturing methods.

出願人  田中貴金属工業株式会社Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 硝酸銀水溶液を還元して銀コロイドを製造する方法にお
いて、還元剤としてのD−エリソルビン酸又はD−エリ
ソルビン酸塩類溶液又はPHを0.1〜7に調整した硝
酸銀水溶液のいずれか又は両方に保護コロイドを添加し
、次いで上記2つの溶液を100℃以下にて混合するこ
とにより安定な銀コロイドを得ることを特徴とする銀コ
ロイドの製造方法。
In a method for producing silver colloid by reducing an aqueous silver nitrate solution, a protective colloid is added to either or both of a solution of D-erythorbic acid or D-erythorbate salts as a reducing agent or an aqueous silver nitrate solution whose pH is adjusted to 0.1 to 7. A method for producing a silver colloid, which comprises adding a stable silver colloid to the solution, and then mixing the two solutions at a temperature of 100° C. or lower to obtain a stable silver colloid.
JP26050687A 1987-10-15 1987-10-15 Manufacture of silver colloid Pending JPH01104340A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26050687A JPH01104340A (en) 1987-10-15 1987-10-15 Manufacture of silver colloid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26050687A JPH01104340A (en) 1987-10-15 1987-10-15 Manufacture of silver colloid

Publications (1)

Publication Number Publication Date
JPH01104340A true JPH01104340A (en) 1989-04-21

Family

ID=17348906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26050687A Pending JPH01104340A (en) 1987-10-15 1987-10-15 Manufacture of silver colloid

Country Status (1)

Country Link
JP (1) JPH01104340A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007016258A (en) * 2005-07-05 2007-01-25 Mitsui Mining & Smelting Co Ltd High crystal silver powder, and method for producing the high crystal silver powder
JP2010209366A (en) * 2009-03-06 2010-09-24 Dic Corp Method for producing metal nanoparticle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007016258A (en) * 2005-07-05 2007-01-25 Mitsui Mining & Smelting Co Ltd High crystal silver powder, and method for producing the high crystal silver powder
JP2010209366A (en) * 2009-03-06 2010-09-24 Dic Corp Method for producing metal nanoparticle

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