JP2565856B2 - Magnetic fluid manufacturing method - Google Patents

Magnetic fluid manufacturing method

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Publication number
JP2565856B2
JP2565856B2 JP61313717A JP31371786A JP2565856B2 JP 2565856 B2 JP2565856 B2 JP 2565856B2 JP 61313717 A JP61313717 A JP 61313717A JP 31371786 A JP31371786 A JP 31371786A JP 2565856 B2 JP2565856 B2 JP 2565856B2
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Japan
Prior art keywords
magnetic fluid
formula
fine particles
hydrocarbon
iron
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JP61313717A
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Japanese (ja)
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JPS63164404A (en
Inventor
勝彦 若山
義和 成宮
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TDK Corp
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TDK Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/44—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids
    • H01F1/442—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids the magnetic component being a metal or alloy, e.g. Fe

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Lubricants (AREA)
  • Soft Magnetic Materials (AREA)

Description

【発明の詳細な説明】 Ｉ 発明の背景 技術分野 本発明は、磁性流体の製造方法に関する 先行技術とその問題点 磁性流体としては、既に酸化物磁性材料（マグネタイ
ト、Fe3O4）の微粒子を表面活性剤で処理して、油類、
水等の中にコロイド状に分散させたものが知られてお
り、実際、多岐の分野で実用化されている。Description: BACKGROUND OF THE INVENTION 1. Technical Field The present invention relates to a prior art relating to a method for producing a magnetic fluid and its problems. As a magnetic fluid, fine particles of an oxide magnetic material (magnetite, Fe 3 O 4 ) have already been used. Treated with a surface-active agent, oils,
It is known that it is dispersed in water or the like in a colloidal form, and is actually put to practical use in various fields.

しかし、マグネタイトでは、飽和磁化が小さいことが
欠点となっている。However, magnetite has a drawback that the saturation magnetization is small.

そこで、飽和磁化の大きい磁性流体の開発が望まれて
いる。この飽和磁化を高めるためには、分散微粒子その
ものの飽和磁化を高めるか、媒体中の微粒子の含有量を
大きくするかの２方法がある。Therefore, development of a magnetic fluid having a large saturation magnetization is desired. There are two methods for increasing the saturation magnetization: increasing the saturation magnetization of the dispersed fine particles themselves or increasing the content of the fine particles in the medium.

後者の微粒子の濃度をあげることには、磁性流体がペ
ースト状になるなどの問題がある。Increasing the concentration of the latter fine particles has a problem that the magnetic fluid becomes a paste.

前者の、飽和磁化の高い微粒子を用いた磁性流体とし
ては、米国特許第322881号および同第322882号に記載さ
れているものがある。すなわち、コバルトカルボニルCo
2(CO)8あるいは鉄カルボニルFe(CO)5をacrylonitoride
styreneやレシチン等のポリマー中で熱分解し、炭化水
素媒体中に分散させる方法である。The former magnetic fluid using fine particles having high saturation magnetization includes those described in US Pat. Nos. 322881 and 322882. That is, cobalt carbonyl Co
Acrylonitoride with 2 (CO) 8 or iron carbonyl Fe (CO) 5
It is a method of thermally decomposing in a polymer such as styrene or lecithin and dispersing it in a hydrocarbon medium.

しかし、この方法では、飽和磁化の高い微粒子を用い
ているので、マグネタイト磁性流体より高い飽和磁化が
期待されるが、金属微粒子の濃度を高くするとペースト
状となるため、濃度を増やすことができず、300〜400G
のものしか得られておらず、マグネタイト磁性流体に比
較して何ら有意性がない。However, this method uses fine particles with high saturation magnetization, so it is expected to have higher saturation magnetization than magnetite magnetic fluid, but if the concentration of metal fine particles is increased, it becomes a paste, so the concentration cannot be increased. , 300-400G
However, it has no significance as compared with magnetite magnetic fluid.

この他にも、無電解めっきの手法を応用して、Fe,Ni,
Co等の強磁性微粒子を得、これを適当な媒体中に分散さ
せる方法、不活性ガス中で、Co、Fe等を爆発させ、これ
らの金属の微粒子を得、これを適当な媒体中に分散させ
る方法等が行われているが、いすれの方法でも、期待さ
れるような飽和磁化の高い磁性流体は得られていない。In addition to this, by applying the electroless plating method, Fe, Ni,
A method of obtaining ferromagnetic fine particles such as Co and dispersing them in a suitable medium, exploding Co, Fe, etc. in an inert gas to obtain fine particles of these metals and dispersing them in an appropriate medium However, the magnetic fluid with high saturation magnetization as expected has not been obtained by any of the methods.

このような実状から本発明者らは、先に、コバルトの
金属微粒子を用いて、種々の媒体（例えば、炭化水素
系、パラフィン系とオレフィン系との混合物、低揮発性
溶媒、ジカルボン酸ジエステル系など）に、種々の界面
活性剤（ポリグリセリンやソルビタンの脂肪酸エステ
ル、リン脂質、非イオン性や油溶性陰イオンの界面活性
剤など）を用いて分散させ、高い飽和磁化を有する磁性
流体が実現する旨を提案している（特開昭61−36907
号、同61−65406号、同61−71603号、同61−73305
号）。From such circumstances, the present inventors have previously used metal fine particles of cobalt to produce various media (for example, a hydrocarbon system, a mixture of a paraffin system and an olefin system, a low volatile solvent, a dicarboxylic acid diester system). Etc.) using various surfactants (polyglycerin and sorbitan fatty acid esters, phospholipids, nonionic and oil-soluble anionic surfactants, etc.) to realize a magnetic fluid with high saturation magnetization. Is proposed (Japanese Patent Laid-Open No. 61-36907).
No. 61, No. 61-65406, No. 61-71603, No. 61-73305
issue).

しかし、コバルトは材料コストの面で不利なことから
材料コストの低い鉄を用いた磁性流体の開発が望まれて
おり、実際本発明者らは鉄を用いた場合も同様に良好な
磁性流体が実現することを見出し、その旨を提案してい
る（特願昭61−48056号）。However, since cobalt is disadvantageous in terms of material cost, it is desired to develop a magnetic fluid using iron having a low material cost. In fact, even when the present invention uses iron, a good magnetic fluid is obtained. We have found that it can be achieved and have proposed that fact (Japanese Patent Application No. 61-48056).

しかしながら、このような磁性流体においては、従来
のものに比較すれば高い飽和磁化が得られるが、それで
もなお十分とはいえず、この点の改善が望まれている。However, in such a magnetic fluid, higher saturation magnetization can be obtained as compared with the conventional one, but it is still not sufficient, and improvement in this point is desired.

II 発明の目的 本発明の目的は、鉄微粒子を用いて、高い飽和磁化を
有し、かつコスト面でも有利な磁性流体の製造方法を提
供することにある。II Object of the Invention An object of the present invention is to provide a method for producing a magnetic fluid that uses iron fine particles and has a high saturation magnetization and is advantageous in terms of cost.

III 発明の開示 このような目的は、下記の本発明によって達成され
る。III Disclosure of the Invention Such an object is achieved by the present invention described below.

すなわち、本発明は、鉄カルボニルと、下記式（Ｉ）
および（II）で表わされる化合物の１種以上である界面
活性剤とを炭化水素系媒体中に含有させ、これを加熱し
て、微粒子と前記界面活性剤と前記炭化水素系媒体とを
含む磁性流体を得る磁性流体の製造方法である。That is, the present invention provides iron carbonyl and the following formula (I)
And a surfactant which is one or more kinds of compounds represented by (II) in a hydrocarbon-based medium, and the mixture is heated to contain magnetic particles containing the fine particles, the surfactant and the hydrocarbon-based medium. It is a method of manufacturing a magnetic fluid that obtains a fluid.

式（Ｉ） 式（II） Ｒ２−０L0ｌＨ ｛上記式（Ｉ）において、R1は炭化水素残基を表わし、
Ｌは、アルキレン鎖を表わし、ｍおよびｎはそれぞれ１
以上の正の整数を表わし、ｍ＋ｎは２〜10の正の整数を
表わす。Formula (I) In formula (II) R 2 -0L0 l H { the formula (I), R 1 represents a hydrocarbon residue,
L represents an alkylene chain, and m and n are each 1
The above-mentioned positive integers are represented, and m + n represents a positive integer of 2-10.

上記式（II）において、R2は炭化水素残基を表わし、
Ｌはアルキレン鎖を表わし、ｌは２〜５の正の整数を表
わす。｝ IV 発明の具体的構成 以下、本発明の具体的構成について詳細に説明する。In the above formula (II), R 2 represents a hydrocarbon residue,
L represents an alkylene chain, and l represents a positive integer of 2-5. IV Specific Configuration of the Invention Hereinafter, the specific configuration of the present invention will be described in detail.

本発明の鉄微粒子を用いた磁性流体では、まず、強磁
性微粒子を液体中で分散させることが不可欠であるた
め、その磁気的凝集力に打ち勝つような粒径にする必要
がある。In the magnetic fluid using the iron fine particles of the present invention, first, it is essential to disperse the ferromagnetic fine particles in the liquid, and therefore it is necessary to make the particle size to overcome the magnetic cohesive force.

本発明では、鉄微粒子は粒径40〜100Åのものを用い
ており、その粒度分布は粒子総数の90％以上が平均粒径
の±20％以内であることが好ましい。In the present invention, iron fine particles having a particle size of 40 to 100Å are used, and the particle size distribution is preferably such that 90% or more of the total number of particles is within ± 20% of the average particle size.

鉄は一部酸化されたものであってもよい。 The iron may be partially oxidized.

本発明においては、界面活性剤として下記一般式
（Ｉ）、（II）で表わされる化合物の１種以上を用いる
ことにより炭化水素系媒体中に安定に分散させている。In the present invention, one or more compounds represented by the following general formulas (I) and (II) are used as the surfactant to stably disperse them in the hydrocarbon medium.

式（Ｉ） 式（II） Ｒ２−０L0ｌＨ ｛上記式（Ｉ）において、R1は炭化水素残基を表わす
が、好ましくは置換または非置換の炭素数12〜20の脂肪
族炭化水素基（好ましくはアルキル基、アルケニル基
等）、特に非置換の不飽和基であるオレイル基C18H35−
等のアルケニル基が好ましい。Formula (I) In formula (II) R 2 -0L0 l H { the formula (I), R 1 is a hydrocarbon residue, preferably a substituted or unsubstituted aliphatic hydrocarbon group having a carbon number of 12 to 20 (preferably alkyl group, alkenyl group, etc.), an oleyl group C 18 H 35 in particular unsubstituted unsaturated group -
Alkenyl groups such as

Ｌは、アルキレン鎖を表わし、特に、置換または非置
換の低級アルキレン基を表わす。この場合ｍ＋ｎ個のＬ
は異なっていてもよいが、通常、同一とされる。また、
Ｌとしては非置換のエチレン基が最も好ましい。L represents an alkylene chain, particularly a substituted or unsubstituted lower alkylene group. In this case, m + n L
May be different, but are usually the same. Also,
Most preferably, L is an unsubstituted ethylene group.

ｍおよびｎはそれぞれ１以上の正の整数を表わすが、
ｍ＋ｎは２〜10、好ましくは２〜５とするのがよい。m and n each represent a positive integer of 1 or more,
m + n is 2-10, preferably 2-5.

上記式（II）において、R2は炭化水素残基を表わす
が、R2は好ましくは炭素数12〜20の置換または非置換の
脂肪族炭化水素基（好ましくはアルキル基、アルケニル
基等）、特に非置換の不飽和基であるオレイル基C18H35
−等のアルケニル基が好ましい。In the above formula (II), R 2 represents a hydrocarbon residue, but R 2 is preferably a substituted or unsubstituted aliphatic hydrocarbon group having 12 to 20 carbon atoms (preferably an alkyl group, an alkenyl group, etc.), Particularly, an oleyl group C 18 H 35 which is an unsubstituted unsaturated group
Alkenyl groups such as-are preferred.

また、R2としてはアルキルアリール基も好適であり、
炭素数８〜９のアルキル基をもつアルキルフェニル基が
好ましい。Further, an alkylaryl group is also suitable as R 2 ,
An alkylphenyl group having an alkyl group having 8 to 9 carbon atoms is preferable.

Ｌは式（Ｉ）におけるものと同義であり、１個のＬは通
常は同一であり、エチレン基が好ましい。L has the same meaning as in formula (I), one L is usually the same, and an ethylene group is preferred.

ｌは２〜５の整数を表わす。 l represents an integer of 2 to 5.

以下、式（Ｉ）、（II）で表わされる化合物の好まし
い具体例を挙げる。Hereinafter, preferred specific examples of the compounds represented by the formulas (I) and (II) will be given.

式（Ｉ）で表わされる化合物 式（Ｉ）において、 R1 Ｌ ｍ ｎ （１）オレイル C2H4 ２ ２ （２）オレイル C2H4 ５ ５ 式（II）で表わされる化合物 式（II）において、 なお、この場合、これらの界面活性剤を２種以上用い
てもよい。Compound represented by formula (I) In formula (I), R 1 L m n (1) oleyl C 2 H 4 2 2 (2) oleyl C 2 H 4 5 5 Compound represented by formula (II) ), In this case, two or more kinds of these surfactants may be used.

添加するこれらの界面活性剤は、鉄微粒子の原料をな
る後記のFe(CO)5に対して１〜10重量％、好ましくは２
〜５重量％添加すればよい。このような割合とするの
は、１重量％未満では分散せず実効がなく、10重量％を
こえると分散せずペースト状となるからである。These surfactants to be added are 1 to 10% by weight, preferably 2 to 10% by weight of Fe (CO) 5 , which will be a raw material of iron fine particles.
It may be added in an amount of up to 5% by weight. The reason for this ratio is that if it is less than 1% by weight, it does not disperse and is ineffective, and if it exceeds 10% by weight, it does not disperse and becomes a paste.

媒体として用いる炭化水素は、炭素原子数７〜22のも
のが好ましく、パラフィンないしオレフィン系、例えば
ケロシン、芳香族系、例えばトルエン、キシレン等が使
用可能である。The hydrocarbon used as the medium preferably has 7 to 22 carbon atoms, and paraffin or olefins such as kerosene and aromatics such as toluene and xylene can be used.

なお、炭化水素媒体は、後記する原料であるFe(CO)5
に対して15重量％以上とすればよく、適宜濃度によって
変化させればよい。The hydrocarbon medium is Fe (CO) 5 which is a raw material described later.
15% by weight or more, and may be appropriately changed depending on the concentration.

15重量％未満となるとペースト状になり分散しにくく
なるからである。This is because if it is less than 15% by weight, it becomes a paste and is difficult to disperse.

このような磁性流体を作成するには、界面活性剤を溶
解させた炭化水素媒体中に鉄カルボニルを加え、混合溶
液を加熱し、鉄ヵルボニルの熱分解を行えばよい。In order to produce such a magnetic fluid, iron carbonyl may be added to a hydrocarbon medium in which a surfactant is dissolved, and the mixed solution may be heated to thermally decompose iron carbonyl.

鉄カルボニルとしては、Fe(CO)5を用いればよい。Fe (CO) 5 may be used as the iron carbonyl.

また、熱分解温度は110〜130℃程度とする。温度およ
び時間については、鉄の濃度によって適宜変更すればよ
い。The thermal decomposition temperature is about 110 to 130 ° C. The temperature and time may be appropriately changed depending on the iron concentration.

このような磁性流体は、所定の容器に入れておく必要
がある。そして、容器内はアルゴン窒素等の不活性ガス
で置換することが好ましい。Such a magnetic fluid needs to be stored in a predetermined container. Then, it is preferable to replace the inside of the container with an inert gas such as argon nitrogen.

なお、鉄微粒子中には一部酸化物が存在していてもよ
い。Note that some oxides may be present in the iron fine particles.

本発明の磁性流体は、鉄微粒子の酸化を防止するため
に、さらに酸化防止剤を含ませることが好ましい。The magnetic fluid of the present invention preferably further contains an antioxidant in order to prevent oxidation of the iron fine particles.

用いる酸化防止剤は、油溶性の一般的なものでよい
が、特に、トコフェロールが好適である。The antioxidant to be used may be a general oil-soluble one, but tocopherol is particularly preferable.

トコフェロールとしては、特に、下記式［Ｖ］で示さ
れるDL−α−トコフェロールが好ましい。As the tocopherol, DL-α-tocopherol represented by the following formula [V] is particularly preferable.

この他、β−トコフェロール、γ−トコフェロール、
δ−トコフェロール、ｄ−α−トコフェロールも使用可
能である。 In addition, β-tocopherol, γ-tocopherol,
δ-tocopherol and d-α-tocopherol can also be used.

α−トコフェロールは必ずしも添加する必要はない
が、添加する場合の添加量は５重量％以下、好ましくは
１〜３重量％とするのがよい。It is not always necessary to add α-tocopherol, but when it is added, the addition amount is 5% by weight or less, preferably 1 to 3% by weight.

５重量％をこえると分散しにくくなるからである。 This is because if it exceeds 5% by weight, it becomes difficult to disperse.

Ｖ 発明の具体的作用効果 本発明によれば、鉄微粒子を、前記一般式（Ｉ）、
（II）で表わされる界面活性剤の１種以上を用いて炭化
水素系媒体中に分散させているため、分散性に優れてお
り、高い飽和磁化を有する磁性流体が得られる。また鉄
微粒子を用いているため、コバルトを用いる場合に比べ
てコスト面でも有利となる。元来、粒子自体としては鉄
の方がコバルトよりも飽和磁化が高く、同じ磁化を有す
るものを得るには鉄微粒子を用いる方が低濃度でかつ低
粘性となる。また、同様に従来の鉄酸化物に比較しても
４〜５倍ほど磁化が高く、同じ磁化を有するものを得る
にも低濃度でかつ低粘性とすることができる。V Specific Actions and Effects of the Invention According to the present invention, iron fine particles are added to the above-mentioned general formula (I)
Since one or more kinds of the surfactants represented by (II) are used to disperse in the hydrocarbon-based medium, a magnetic fluid having excellent dispersibility and high saturation magnetization can be obtained. Further, since iron fine particles are used, it is more advantageous in terms of cost than when cobalt is used. Originally, iron as particles themselves had a higher saturation magnetization than cobalt, and in order to obtain particles having the same magnetization, iron fine particles had a lower concentration and a lower viscosity. Further, similarly, the magnetization is about 4 to 5 times higher than that of the conventional iron oxide, and it is possible to obtain a material having the same magnetization with a low concentration and a low viscosity.

さらに、微粒子の濃度を変えることにより、所望の飽
和磁化を有する磁性流体を得ることもできる。Furthermore, by changing the concentration of fine particles, it is possible to obtain a magnetic fluid having a desired saturation magnetization.

この場合、このような効果は、本発明における微粒
子、界面活性剤および炭化水素系媒体の組み合わせによ
って可能となるものである。In this case, such an effect is made possible by the combination of the fine particles, the surfactant and the hydrocarbon medium in the present invention.

VI 発明の具体的実施例 以下、本発明の具体的実施例を示し、本発明をさらに
詳細に説明する。VI Specific Examples of the Invention Hereinafter, the present invention will be described in more detail by showing specific examples of the invention.

実施例１ ジポリオキシエチレン（２）オレイルアミン［NIKKOL
社製TAMNO−2;式（Ｉ）で表わされる化合物（１）］3.1
7gをケロシン媒12gに溶解させた溶液を冷却器、温度
計、攪拌装置をつけた三つ口フラスコに入れた。これに
ペンタカルボニル鉄Fe(CO)5を74.5g（50ml）加えた。さ
らに酸化防止剤のα−トコフェロール1.2gを加えた。Example 1 Dipolyoxyethylene (2) oleylamine [NIKKOL
Manufactured by TAMNO-2; compound (1) represented by formula (I)] 3.1
A solution prepared by dissolving 7 g of kerosene medium in 12 g was placed in a three-necked flask equipped with a condenser, a thermometer, and a stirrer. 74.5 g (50 ml) of pentacarbonyliron Fe (CO) 5 was added thereto. Further, 1.2 g of α-tocopherol as an antioxidant was added.

この混合溶液を攪拌しながら、マントルヒーターで徐
々に加熱し、還流を行いながら鉄カルボニルの熱分解を
行った。この際、冷却器上部から分解してできたCOが発
生する。The mixed solution was gradually heated with a mantle heater while being stirred, and iron carbonyl was thermally decomposed while being refluxed. At this time, CO generated by decomposition from the upper part of the cooler is generated.

このCOの発生は、PdCl2溶液（アセトン：水＝1:1）に
通すことによって確認した。The generation of CO was confirmed by passing it through a PdCl 2 solution (acetone: water = 1: 1).

すなわち、橙色のPdCl2溶液はCOの導入により黒色に
変化するからである。That is, the orange PdCl 2 solution turns black by the introduction of CO.

COの発生が終了してから、約30分間攪拌を続けた後、
冷却した。これにより、黒色の溶液ができた。この黒色
の溶液を6000rpmの遠心下で１時間遠心分離を行った。After the generation of CO is over, continue stirring for about 30 minutes,
Cool. This produced a black solution. This black solution was centrifuged at 6000 rpm for 1 hour.

しかし、このとき、ほとんど分離・沈降はなかった。 However, at this time, there was almost no separation / sedimentation.

ケロシン媒の量を変化させることにより、磁性流体の
濃度を変化させることが可能である。By changing the amount of the kerosene medium, it is possible to change the concentration of the magnetic fluid.

得られた溶液の比重と４πIsの関係を第１図に示す
（ここでは、濃度のかわりに比重をパラメータにし
た）。The relationship between the specific gravity of the obtained solution and 4πIs is shown in FIG. 1 (here, the specific gravity is used as a parameter instead of the concentration).

実施例２ 実施例１において、ジポリオキシエチレン（２）オレ
イルアミンの代わりにポリオキシエチレン（３）オクチ
ルフェニルエーテル［NIKKOL社製DP−3;式（II）で表わ
される化合物（４）］2.0gを使った。ただし、Fe(CO)5
は40ml、ケロシン媒は10g、α−トコフェロールは1.0g
とした。得られた黒色の溶液を6000rpmの遠心下で１時
間遠心分離を行なったがほとんど分離沈降しなかった。Example 2 In Example 1, 2.0 g of polyoxyethylene (3) octyl phenyl ether [DP-3 manufactured by NIKKOL; compound (4) represented by formula (II)] was used instead of dipolyoxyethylene (2) oleylamine. I used. However, Fe (CO) 5
40 ml, kerosene medium 10 g, α-tocopherol 1.0 g
And The obtained black solution was centrifuged at 6000 rpm for 1 hour, but it hardly separated and settled.

溶液の比重1.3419で15kOeにおいて４πIsは830Gであ
った。The specific gravity of the solution was 1.3419, and 4πIs was 830 G at 15 kOe.

比較例１ 実施例１においてジポリオキシエチレン（２）オレイ
ルアミンのかわりにジポリオキシエチレン（10）オレイ
ルアミン［一般式（Ｉ）においてｍ＝ｎ＝10NIKKOL社製
TAMNO−10］を2.0g用いて、同様な処理操作を行ったと
ころ、遠心分離後の沈降が多く、上澄である磁性流体の
４πIsの値は15kOeにおいて、100Gと低かった。Comparative Example 1 Instead of dipolyoxyethylene (2) oleylamine in Example 1, dipolyoxyethylene (10) oleylamine [in the general formula (I), m = n = 10 manufactured by NIKKOL Inc.]
The same treatment operation was performed using 2.0 g of TAMNO-10]. As a result, sedimentation after centrifugation was large, and the value of 4πIs of the supernatant magnetic fluid was as low as 100 G at 15 kOe.

比較例２ 実施例１においてジポリオキシエチレン（２）オレイ
ルアミンのかわりにジポリオキシエチレン（10）オレイ
ン酸アミド［NIKKOL社製TAMDO−10］を2.0g用いて、同
様な処理操作を行ったところ、遠心分離後の沈降が多
く、上澄である磁性流体の４πIsの値は15kOeにおい
て、70Gと低かった。Comparative Example 2 When a similar treatment operation was performed using 2.0 g of dipolyoxyethylene (10) oleic acid amide [TAMDO-10 manufactured by NIKKOL] instead of dipolyoxyethylene (2) oleylamine in Example 1. The sedimentation after centrifugation was large, and the value of 4πIs of the supernatant magnetic fluid was as low as 70 G at 15 kOe.

【図面の簡単な説明】[Brief description of drawings]

第１図は、本発明の磁性流体における比重と15kOeでの
４πIs（Ｇ）との関係を示すグラフである。FIG. 1 is a graph showing the relationship between specific gravity and 4πIs (G) at 15 kOe in the magnetic fluid of the present invention.

フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ１０Ｍ 133:06 129:16） Ｃ１０Ｎ 10:08 20:06 Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area C10M 133: 06 129: 16) C10N 10:08 20:06

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】鉄カルボニルと、下記式（Ｉ）および（I
I）で表わされる化合物の１種以上である界面活性剤と
を炭化水素系媒体中に含有させ、これを加熱して、鉄微
粒子と前記界面活性剤と前記炭化水素系媒体とを含む磁
性流体を得る磁性流体の製造方法。 式（Ｉ） 式（II） Ｒ２−０L0１Ｈ ｛上記式（Ｉ）において、R1は炭化水素残基を表わし、
Ｌは、アルキレン鎖を表わし、ｍおよびｎはそれぞれ１
以上の正の整数を表わし、ｍ＋ｎは２〜10の正の整数を
表わす。 上記式（II）において、R2は炭化水素残基を表わし、Ｌ
は、アルキレン鎖を表わし、１は２〜５の正の整数を表
わす。｝1. Iron carbonyl and the following formulas (I) and (I
A magnetic fluid containing iron fine particles, the surfactant and the hydrocarbon-based medium, which is obtained by incorporating a surfactant, which is one or more kinds of compounds represented by I), into a hydrocarbon-based medium and heating the hydrocarbon-based medium. And a method for producing a magnetic fluid. Formula (I) In formula (II) R 2 -0L0 1 H { the formula (I), R 1 represents a hydrocarbon residue,
L represents an alkylene chain, and m and n are each 1
The above-mentioned positive integers are represented, and m + n represents a positive integer of 2-10. In the above formula (II), R 2 represents a hydrocarbon residue, and L 2
Represents an alkylene chain, and 1 represents a positive integer of 2 to 5. ｝
JP61313717A 1986-12-26 1986-12-26 Magnetic fluid manufacturing method Expired - Lifetime JP2565856B2 (en)

Priority Applications (1)

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JP61313717A JP2565856B2 (en) 1986-12-26 1986-12-26 Magnetic fluid manufacturing method

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JP61313717A JP2565856B2 (en) 1986-12-26 1986-12-26 Magnetic fluid manufacturing method

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JPS63164404A JPS63164404A (en) 1988-07-07
JP2565856B2 true JP2565856B2 (en) 1996-12-18

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Country Link
JP (1) JP2565856B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040022937A1 (en) * 2002-07-31 2004-02-05 General Electric Company Method of making crystalline nanoparticles

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52782A (en) * 1975-06-24 1977-01-06 Junzo Shimoiizaka Process for production of magnetic fluid
JPS58174495A (en) * 1982-04-07 1983-10-13 Nippon Seiko Kk Preparation of magnetic fluid
JPS6058497A (en) * 1983-09-10 1985-04-04 Tdk Corp Magnetic fluid
JPS60162704A (en) * 1984-02-01 1985-08-24 Natl Res Inst For Metals Production of magnetic fluid

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