JPS6164330A - Magnetic fluid and its preparation - Google Patents
Magnetic fluid and its preparationInfo
- Publication number
- JPS6164330A JPS6164330A JP59187829A JP18782984A JPS6164330A JP S6164330 A JPS6164330 A JP S6164330A JP 59187829 A JP59187829 A JP 59187829A JP 18782984 A JP18782984 A JP 18782984A JP S6164330 A JPS6164330 A JP S6164330A
- Authority
- JP
- Japan
- Prior art keywords
- polyalkylene glycol
- adsorbed
- magnetic fluid
- fine particles
- magnetic
- 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.)
- Granted
Links
Landscapes
- Colloid Chemistry (AREA)
- Lubricants (AREA)
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁性流体およびその製造法に関する。[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to magnetic fluids and methods of manufacturing the same.
更に詳しくは、良好な磁性体微粒子の分散状態を保持せ
しめた磁性流体およびその製造法釦関する。More specifically, the present invention relates to a magnetic fluid that maintains a good dispersion state of magnetic particles and a method for producing the same.
従来用いられている磁性流体は、磁性体微粒子の表面に
界面活性剤を吸着、配向せしめ、これを界面活性剤とは
異なる物質たる溶剤中に分散させて製造されている。従
って、界面活性剤が熱などによって磁性体微粒子の表面
から脱離すると、安定な分散状態が維持されなくなるば
かりではなく、これを磁性流体シールとして用いたとき
、シールすべき溶液が脱離した界面活性剤によってエマ
ルジョン化されるため、液体用シールとしての作用を果
し得ないようになる。Conventionally used magnetic fluids are produced by adsorbing and orienting a surfactant on the surface of magnetic fine particles and dispersing the surfactant in a solvent, which is a substance different from the surfactant. Therefore, if the surfactant is detached from the surface of the magnetic fine particles due to heat, etc., not only will a stable dispersion state not be maintained, but when the surfactant is used as a magnetic fluid seal, the solution to be sealed will be separated from the surface. Since it is emulsified by the activator, it is no longer able to act as a seal for liquids.
かかる現状に鑑み、良好な磁性体微粒子の分散状態を保
持せしめる磁性流体が望１れでいるが、本発明者は界面
活性剤を用いることなく、磁性体微粒子の吸着体および
分散媒に共にポリアルキレングリコールを用いることに
より、かかる課題が効果的に解決させることを見出した
。In view of the current situation, there is a need for a magnetic fluid that can maintain a good dispersion state of magnetic fine particles, but the present inventor has developed a magnetic fluid that can be used as both an adsorbent and a dispersion medium for magnetic fine particles without using a surfactant. It has been found that this problem can be effectively solved by using alkylene glycol.
〔問題点を解決するための手段〕および〔作用〕従って
、本発明は磁性流体に係り、この磁性流体は、ポリアル
キレングリコールを少くとも表面に吸着せしめた磁性体
微粒子、好ましくは四三酸化鉄微粒子を吸着されたポリ
アルキレングリコールと同等またはそれ以下の分子量を
有する液状ポリアルキレングリコール中に分散せしめて
なる。[Means for Solving the Problems] and [Operation] Accordingly, the present invention relates to a magnetic fluid, which comprises magnetic fine particles, preferably triiron tetroxide, on which at least polyalkylene glycol is adsorbed. The fine particles are dispersed in liquid polyalkylene glycol having a molecular weight equal to or lower than that of the adsorbed polyalkylene glycol.
本発明はまた、かかる磁性流体の製造法に係り、磁性流
体の製造は、ポリアルキレングリコールの存在下で、塩
化第２鉄を鉄粉および塩酸音用いて四三酸化鉄に変換せ
しめ、得られたポリアルキレングリコール吸着四三酸化
鉄微粒子を吸着されたポリアルキレングリコールと同等
またはそれ以下の分子量を有する液状ポリアルキレング
リコール中に分散せしめることにより行われる。The present invention also relates to a method for producing such a magnetic fluid, which is obtained by converting ferric chloride into triiron tetroxide using iron powder and hydrochloric acid sound in the presence of polyalkylene glycol. This is carried out by dispersing the polyalkylene glycol-adsorbed triiron tetroxide fine particles in a liquid polyalkylene glycol having a molecular weight equal to or lower than that of the adsorbed polyalkylene glycol.
このような製造法では、具体的には分子１士約２００以
上のポリエチレングリコールと塩化第２鉄水溶液との混
合液を、鉄粉および塩酸の混合液に加えて、四三酸化鉄
を形成きせることかまず行われる。Specifically, in this manufacturing method, a mixture of polyethylene glycol having a molecular weight of about 200 molecules or more and an aqueous ferric chloride solution is added to a mixture of iron powder and hydrochloric acid to form triiron tetroxide. This is done first.
四三酸化鉄の形成反応は既に公知であり、次のような反
応七情構に従って反応が行われるものと考えられる。The formation reaction of triiron tetroxide is already known, and it is thought that the reaction is carried out according to the following reaction structure.
Ｆｅｅｌ、 ＋３Ｈ２０−＋アｅ（ｏｎ）、＋ｌｃ１・
−・（１）Ｐｇ ＋ ２ＨＯ］−→Ｆｅｏ１２＋ Ｈ２
↑ ・・・・・・（２）上記（１）式の反応時に
、塩化第２鉄水溶液にポリエチレングリコールが水浴液
として加えられ、還流処理される。そして、この第１液
が、鉄粉および塩酸の混合液よりなる第２液の還流液中
に滴下され、更に還流することによって四三酸化鉄を形
成させると共に、形成された四三酸化鉄微粒子の表面お
よび場合によって−は一部がその凝集体内部に迄ポリエ
チレングリコールが吸：Ｒ（および包含）される。Feel, +3H20-+ae(on), +lc1・
−・(1)Pg + 2HO]−→Feo12+ H2
↑ ... (2) During the reaction of the above formula (1), polyethylene glycol is added as a water bath liquid to the ferric chloride aqueous solution, and the mixture is refluxed. Then, this first liquid is dropped into a refluxing second liquid consisting of a mixed liquid of iron powder and hydrochloric acid, and is further refluxed to form triiron tetroxide, and the formed triiron tetroxide fine particles. The polyethylene glycol is adsorbed (and included) on the surface and possibly even partially into the aggregate.
得られたポリエチレングリコール吸着四三酸化鉄微粒子
は、吸着されたポリエチレングリフールと同等またはそ
れ以下の分子ｉｔを有する液状ポリエチレングリコール
中に、約０．１〜２．Ｏり鷹の濃度で分散せしめる。The obtained polyethylene glycol-adsorbed triiron tetroxide fine particles are dissolved in liquid polyethylene glycol having a molecular weight equivalent to or smaller than that of the adsorbed polyethylene glycol by about 0.1 to 2. Disperse at the same concentration.
なお、ポリエチレングリコールが好ましいポリアルキレ
ングリコールとして用いられるが、これ以外に液状のポ
リプロピレングリコール、エチレンオキサイド−プロピ
レンオキサイド共重合体なども同様に用いることができ
る。Although polyethylene glycol is preferably used as the polyalkylene glycol, liquid polypropylene glycol, ethylene oxide-propylene oxide copolymer, etc. can also be used in the same manner.
禾発明によって得られる磁性流体は、四三酸化鉄によっ
て代表される磁性体の微粒子に予めポリアルキレングリ
コールを解フウさせ、これらを凝集させて磁性を有する
より大きな微粒子を形成させるため、磁性体の表面およ
び場合によっては一部がその凝集体の内部に迄吸着（お
よび包含）されたポリアルキレングリコールと磁性体微
粒子との固着状態が蚕牢であり、また磁性体微粒子に解
コウしているポリアルキレングリコールと同等またはそ
れ以下の分子量の液状ポリアルキレングリコールを分散
媒としているため、そこに非常にすぐれた分散状態を有
する磁性流体が形成される。The magnetic fluid obtained by the present invention is made by pre-defusing polyalkylene glycol into fine particles of magnetic material represented by triiron tetroxide, and agglomerating them to form larger magnetic particles. The adhesion state of polyalkylene glycol adsorbed (and included) on the surface and, in some cases, to the inside of the aggregate, and the magnetic particles is called silage, and the state of adhesion between the polyalkylene glycol and the magnetic particles, which are partially adsorbed (and included) on the surface and, in some cases, inside the aggregates, is called silica. Since a liquid polyalkylene glycol having a molecular weight equal to or lower than that of alkylene glycol is used as a dispersion medium, a magnetic fluid having an extremely excellent dispersion state is formed therein.
この結果、本発明の磁性流体は、従来の磁性流体のよう
に、界面活性剤が脱離して分散状態が損われ、またシー
ルすべき流体にそれが混入されてエマルジョンを形成し
たりすることがないので、現在オイルシールが利用され
ているような一般的な潤滑油のシールなどに有効に使用
することができる。As a result, in the magnetic fluid of the present invention, unlike conventional magnetic fluids, the surfactant is detached and the dispersion state is impaired, and the surfactant is not mixed into the fluid to be sealed to form an emulsion. Therefore, it can be effectively used for general lubricating oil seals such as those currently used as oil seals.
次に、実施例について本発明を説明する。 Next, the present invention will be explained with reference to examples.
実施例
平均分子１６ｏｏのポリエチレングリコールノ１重社％
水浴液１９７ＷＬｔｆ：煮沸させ、これに１．ＯＮ −
ＦｅＯｌ、水溶液３．６ｒｎｔを滴下し、その後７００
−の沸騰水を加えて還流する（第１液）。Example Polyethylene glycol No. 1 Jyusha % with an average molecular weight of 16oo
Water bath liquid 197WLtf: Boil and add 1. ON-
FeOl, aqueous solution 3.6rnt was added dropwise, then 700rnt
- Add boiling water and reflux (1st liquid).
一方、５００ ｒｎｔの水に１２Ｎ−Ｍｏｌ水溶液３３
ｒｎｔおよび鉄粉２０ ｇを加え、煮沸、還流する（第
２液）。On the other hand, 12N-Mol aqueous solution 33
Add rnt and 20 g of iron powder, boil and reflux (second liquid).
この煮沸、還流下の第２液に前記第１液を滴下し、還流
した後上澄液を除去し、へ渣を乾燥させる。The first liquid is added dropwise to the second liquid under boiling and refluxing, and after refluxing, the supernatant liquid is removed and the residue is dried.
乾燥させた微粒子を脱塩水中に再分散させ、遠心分離す
る操作を数回くり返し、微粒子の洗浄を行なう。The dried fine particles are redispersed in demineralized water and centrifuged several times to wash the fine particles.
この洗浄された乾燥微粒子を、１．６ ｇ／ｄの濃度で
、平均分子量２００のポリエチレングリコール中へ分散
させる。The washed dry fine particles are dispersed in polyethylene glycol having an average molecular weight of 200 at a concentration of 1.6 g/d.
Claims (1)
しめた磁性体微粒子を吸着されたポリアルキレングリコ
ールと同等またはそれ以下の分子量を有する液状ポリア
ルキレングリコール中に分散せしめた磁性流体。 ２、磁性体微粒子が四三酸化鉄微粒子である特許請求の
範囲第１項記載の磁性流体。 ３、ポリアルキレングリコールの存在下で、塩化第２鉄
を鉄粉および塩酸を用いて四三酸化鉄に変換せしめ、得
られたポリアルキレングリコール吸着四三酸化鉄微粒子
を吸着されたポリアルキレングリコールと同等またはそ
れ以下の分子量を有する液状ポリアルキレングリコール
中に分散せしめることを特徴とする磁性流体の製造法。 ４、ポリアルキレングリコールと塩化第２鉄水溶液との
混合液を鉄粉および塩酸の混合液に加え、四三酸化鉄を
形成させる特許請求の範囲第３項記載の磁性流体の製造
法。[Scope of Claims] 1. A magnetic fluid in which magnetic fine particles with polyalkylene glycol adsorbed on at least the surface thereof are dispersed in liquid polyalkylene glycol having a molecular weight equal to or lower than that of the adsorbed polyalkylene glycol. 2. The magnetic fluid according to claim 1, wherein the magnetic particles are triiron tetroxide particles. 3. In the presence of polyalkylene glycol, ferric chloride is converted to triiron tetroxide using iron powder and hydrochloric acid, and the resulting polyalkylene glycol-adsorbed triiron tetroxide fine particles are combined with the adsorbed polyalkylene glycol. 1. A method for producing a magnetic fluid, which comprises dispersing it in a liquid polyalkylene glycol having an equivalent or lower molecular weight. 4. The method for producing a magnetic fluid according to claim 3, wherein a mixture of polyalkylene glycol and an aqueous ferric chloride solution is added to a mixture of iron powder and hydrochloric acid to form triiron tetroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59187829A JPS6164330A (en) | 1984-09-07 | 1984-09-07 | Magnetic fluid and its preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59187829A JPS6164330A (en) | 1984-09-07 | 1984-09-07 | Magnetic fluid and its preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6164330A true JPS6164330A (en) | 1986-04-02 |
| JPH052719B2 JPH052719B2 (en) | 1993-01-13 |
Family
ID=16212960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59187829A Granted JPS6164330A (en) | 1984-09-07 | 1984-09-07 | Magnetic fluid and its preparation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6164330A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018135081A1 (en) * | 2017-01-23 | 2018-07-26 | 株式会社Ｓｃｒｅｅｎホールディングス | Pigment composition |
| CN113230987A (en) * | 2021-05-24 | 2021-08-10 | 南京工业大学 | Simple preparation method of magnetic chitosan aerogel |
-
1984
- 1984-09-07 JP JP59187829A patent/JPS6164330A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018135081A1 (en) * | 2017-01-23 | 2018-07-26 | 株式会社Ｓｃｒｅｅｎホールディングス | Pigment composition |
| JP2018119022A (en) * | 2017-01-23 | 2018-08-02 | 株式会社Ｓｃｒｅｅｎホールディングス | Pigment composition |
| CN113230987A (en) * | 2021-05-24 | 2021-08-10 | 南京工业大学 | Simple preparation method of magnetic chitosan aerogel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH052719B2 (en) | 1993-01-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |