JPH0765063B2 - Magnetic fluid manufacturing method - Google Patents
Magnetic fluid manufacturing methodInfo
- Publication number
- JPH0765063B2 JPH0765063B2 JP61152151A JP15215186A JPH0765063B2 JP H0765063 B2 JPH0765063 B2 JP H0765063B2 JP 61152151 A JP61152151 A JP 61152151A JP 15215186 A JP15215186 A JP 15215186A JP H0765063 B2 JPH0765063 B2 JP H0765063B2
- Authority
- JP
- Japan
- Prior art keywords
- base oil
- magnetic fluid
- boiling
- low
- producing
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Lubricants (AREA)
- Soft Magnetic Materials (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、磁性流体の製造法に関する。更に詳しくは、
界面活性剤を吸着させたフェライト類超微粒子を所望の
高沸点基油中に分散させる磁性流体の製造法に関する。TECHNICAL FIELD The present invention relates to a method for producing a magnetic fluid. For more details,
The present invention relates to a method for producing a magnetic fluid in which ultrafine ferrite particles having a surface active agent adsorbed therein are dispersed in a desired high boiling point base oil.
強アルカリによる共沈法で得られたフェライト類（マグ
ネタイト、Mn−フェライト、Ni−フェライト、Mn・Ni−
フェライト、Ni・Zn−フェライトなど）の超微粒子の水
性けん濁に、オレイン酸ナトリウム、ソジウムジオクチ
ルスルホンサクシネート（商品名Aerosol OT）などによ
って代表される各種の界面活性剤を加え、これを例えば
90℃、30分間加熱することにより、フェライト類超微粒
子に界面活性剤を吸着させ、この界面活性剤吸着フェラ
イト類超微粒子を減圧乾燥した後、エイコシルナフタリ
ンによって代表される高級アルキル置換ナフタリン、セ
バシン酸ジオクチル、アジピン酸ジオクチルによって代
表されるジカルボン酸ジ高級アルキルエステルなどの沸
点約150℃以上の高沸点基油中に、超音波を照射しなが
ら分散せしめることが従来から行われている。これは、
磁性流体が濃縮されると超微粒子の分散安定性が悪化す
るために、低蒸気圧、高沸点の基油を用いて、基油の蒸
発による濃縮を防止せんとしているのである。しかしな
がら、このような分散方法によったのでは、凝集粉にこ
れらの基油が浸透しないため、全く分散が行われないこ
とが多い。Ferrites obtained by co-precipitation method with strong alkali (magnetite, Mn-ferrite, Ni-ferrite, Mn-Ni-
Ferrite, Ni-Zn-ferrite, etc.) ultrafine particles of aqueous suspension, various surfactants represented by sodium oleate, sodium dioctyl sulfone succinate (trade name Aerosol OT), etc. are added,
The surfactant is adsorbed on the ultrafine ferrite particles by heating at 90 ° C for 30 minutes, the ultrafine particles adsorbing the surfactant are dried under reduced pressure, and then the higher alkyl-substituted naphthalene represented by eicosylnaphthalene, sebacine. It has been conventionally performed to disperse ultrasonic waves in a high boiling base oil having a boiling point of about 150 ° C. or higher such as dicarboxylic acid higher alkyl ester represented by dioctyl acid and dioctyl adipate. this is,
When the magnetic fluid is concentrated, the dispersion stability of the ultrafine particles deteriorates. Therefore, a base oil having a low vapor pressure and a high boiling point is used to prevent the base oil from being concentrated by evaporation. However, according to such a dispersion method, since these base oils do not penetrate into the agglomerated powder, the dispersion is often not performed at all.
そこで、本発明者らは、界面活性剤吸着フェライト類超
微粒子を所望の高沸点基油中に分散させる方法について
検討した結果、低沸点基油に一旦分散させたフェライト
類超微粒子を溶剤基油の置換法により高沸点基油に分散
させる方法がきわめて有効であることを見出した。Therefore, as a result of studying a method of dispersing the surfactant-adsorbed ferrite ultrafine particles in a desired high boiling point base oil, the present inventors have determined that the ferrite ultrafine particles once dispersed in the low boiling point base oil are solvent base oils. It was found that the method of dispersing in high boiling point base oil by the substitution method of 1 is extremely effective.
従って、本発明は磁性流体の製造法に係り、磁性流体の
製造法は、界面活性剤を吸着させたフェライト超微粒子
の低沸点基油分散物を、該低沸点基油と相溶性を有しか
つ約150℃以上に加熱された高沸点基油中へ滴下するこ
とにより低沸点基油を蒸発させる溶剤基油の置換法によ
って行われる。Therefore, the present invention relates to a method for producing a magnetic fluid, which is characterized in that a low boiling point base oil dispersion of ferrite ultrafine particles having a surfactant adsorbed thereon is compatible with the low boiling point base oil. In addition, the solvent base oil is replaced by a method in which the low boiling base oil is evaporated by dropping it into the high boiling base oil heated to about 150 ° C. or higher.
界面活性剤を吸着させたフェライト類超微粒子として
は、従来公知のものが乾燥した上でそのまま用いられ、
これを低沸点基油、好ましくはシクロヘキサン、トルエ
ンなどの沸点が約30〜150℃、好ましくは約30〜110℃の
炭化水素溶剤中に一旦分散させる。ここでは、一般に超
微粒子濃度が約0.1〜1.3g/mlになるように低沸点基油が
用いられる。これ以上の濃度に調製されると、フェライ
ト類超微粒子はゲル化してしまい、磁性液体をもはや形
成しない。As the ferrite ultrafine particles having a surface active agent adsorbed thereon, conventionally known ones can be used as they are after being dried,
This is once dispersed in a low boiling base oil, preferably a hydrocarbon solvent such as cyclohexane or toluene having a boiling point of about 30 to 150 ° C, preferably about 30 to 110 ° C. Here, a low boiling base oil is generally used so that the concentration of ultrafine particles is about 0.1 to 1.3 g / ml. When the concentration is adjusted to be higher than this, the ultrafine ferrite particles are gelated and no longer form a magnetic liquid.
次いで、この低沸点基油分散物（磁性流体）を、最終的
に求められる磁性流体の超微粒子濃度に応じた量の、低
沸点基油と相溶性を有する高沸点基油であって、約150
℃以上に加熱されたもの、例えば270℃に加熱されたエ
イコシルナフタリン、200℃に加熱されたセバシン酸ジ
オクチル、180℃に加熱されたアジピン酸ジオクチル中
などへ滴下すると、この加熱温度よりかなり低い沸点を
有する低沸点基油は滴下と同時に蒸発除去され、かかる
溶剤基油の置換によって高沸点基油分散磁性流体が得ら
れる。Then, this low boiling point base oil dispersion (magnetic fluid) is a high boiling point base oil compatible with the low boiling point base oil in an amount corresponding to the final ultrafine particle concentration of the magnetic fluid. 150
When heated to above ℃, such as eicosylnaphthalene heated to 270 ℃, dioctyl sebacate heated to 200 ℃, dioctyl adipate heated to 180 ℃ The low-boiling base oil having a boiling point is removed by evaporation at the same time as the dropping, and the high-boiling base oil-dispersed magnetic fluid is obtained by replacing the solvent base oil.
本発明方法によれば、界面活性剤吸着フェライト類超微
粒子を一旦低沸点基油に分散させ、これを溶剤基油の置
換法により高沸点基油と置換することにより、低沸点基
油分散磁性流体の良好な分散性および飽和磁化を保持し
たまま、フェライト類超微粒子を高沸点基油に分散させ
た磁性流体を得ることができる。According to the method of the present invention, ultrafine particles of a surfactant-adsorbed ferrite are once dispersed in a low-boiling base oil, and this is replaced with a high-boiling base oil by a solvent base oil replacement method to obtain a low-boiling base oil dispersion magnetic property. It is possible to obtain a magnetic fluid in which ultrafine ferrite particles are dispersed in a high-boiling base oil while maintaining good dispersibility and saturation magnetization of the fluid.
次に、実施例について本発明を説明する。 Next, the present invention will be described with reference to examples.
実施例 FeCl2・nH2O 20gおよびFeCl3・6H2O 50gをそれぞれ水10
0mlに溶解させた後混合し、そこに6N NaOH水溶液をpH11
になる迄、10ml/分の滴下速度で攪拌下に滴下する。滴
下終了後、100℃で30分間加熱還流させた後冷却し、水
で洗浄する。洗浄された水性けん濁液の全量を500mlと
した後、そこにオレイン酸ナトリウム6gを加え、90℃で
30分間加熱してから水で洗浄し、乾燥する。Example FeCl 2 .nH 2 O 20 g and FeCl 3 .6H 2 O 50 g were each added to water 10
After dissolving in 0 ml, mix and add 6N NaOH aqueous solution to pH 11
Until it reaches 10 liters / minute with stirring at a dropping rate. After completion of the dropping, the mixture is heated under reflux at 100 ° C for 30 minutes, cooled, and washed with water. After making the total volume of the washed aqueous suspension 500 ml, add 6 g of sodium oleate and add it at 90 ° C.
Heat for 30 minutes, wash with water and dry.
得られた界面活性剤吸着マグネタイト超微粒子23gをシ
クロヘキサン100mlに分散させ、飽和磁化3.4×10-3T
（1.3KA/m印加時）の磁性流体を得た。23 g of the obtained surfactant-adsorbed magnetite ultrafine particles were dispersed in 100 ml of cyclohexane, and the saturation magnetization was 3.4 × 10 -3 T.
A magnetic fluid of (applying 1.3 KA / m) was obtained.
この磁性流体100mlを、270℃のエイコシルナフタリン中
に毎分10mlの滴下速度で滴下すると、滴下と同時にシク
ロヘキサンが蒸発し、速やかに溶剤基油の置換が行わ
れ、飽和磁化3.4×10-3T（1.3KA/m印加時）の高沸点基
油分散磁性流体が得られた。When 100 ml of this magnetic fluid was dropped into eicosylnaphthalene at 270 ° C. at a dropping rate of 10 ml per minute, cyclohexane was evaporated at the same time as the dropping, and the solvent base oil was quickly replaced, and the saturation magnetization was 3.4 × 10 -3. A high-boiling base oil-dispersed magnetic fluid with T (1.3KA / m applied) was obtained.
比較例１ 実施例で用いられた界面活性剤吸着マグネタイト超微粒
子23gをエイコシルナフタリン100ml中に加え、超音波照
射を行なったが、殆んど分散は生じなかった。Comparative Example 1 23 g of the surfactant-adsorbed magnetite ultrafine particles used in the examples were added to 100 ml of eicosylnaphthalene and subjected to ultrasonic irradiation, but almost no dispersion occurred.
比較例２ 実施例のシクロヘキサン中に分散させた磁性流体100ml
に、100mlのエイコシルナフタリンを添加した後、室
温、減圧（50mmHg）条件下でシクロヘキサンを留去する
と、高沸点基油分散磁性流体は得られたものの、分散不
良微粒子を生じ、またその飽和磁化は1.5×10-3T（1.3K
A/m印加時）にすぎなかった。Comparative Example 2 100 ml of magnetic fluid dispersed in cyclohexane of Example
Then, after adding 100 ml of eicosylnaphthalene, cyclohexane was distilled off at room temperature under reduced pressure (50 mmHg), and although high-boiling base oil-dispersed magnetic fluid was obtained, poorly dispersed fine particles were formed and its saturation magnetization was increased. Is 1.5 × 10 -3 T (1.3K
A / m was applied).
比較例３ 比較例２において、エイコシルナフタリンと共に、非イ
オン系界面活性剤であるポリオキシエチレンノニルフェ
ニルエーテル（HLB 11）を10g用いると、最終的に得ら
れた高沸点基油分散磁性流体は、著しい粘度増加を示
し、実用性の点に欠けているものしか得られなかった。Comparative Example 3 In Comparative Example 2, when 10 g of polyoxyethylene nonylphenyl ether (HLB 11) which is a nonionic surfactant was used together with eicosylnaphthalene, the finally obtained high boiling point base oil-dispersed magnetic fluid was However, it showed a remarkable increase in viscosity, and only those lacking practicality were obtained.
───────────────────────────────────────────────────── 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 Ｃ１０Ｎ 10:16 20:06 Ｚ 30:04 40:14 70:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location C10N 10:16 20:06 Z 30:04 40:14 70:00
Claims (4)
子の低沸点基油分散物を、該低沸点基油と相溶性を有し
かつ約150℃以上に加熱された高沸点基油中へ滴下する
ことにより低沸点基油を蒸発させ、溶剤基油の置換を行
なうことを特徴とする磁性流体の製造法。1. A low-boiling base oil dispersion of ferrite fine particles having a surface active agent adsorbed therein, into a high-boiling base oil which is compatible with the low-boiling base oil and is heated to about 150 ° C. or higher. A method for producing a magnetic fluid, characterized in that a low boiling base oil is evaporated by dropping to replace a solvent base oil.
溶剤である特許請求の範囲第１項記載の磁性流体の製造
法。2. The method for producing a magnetic fluid according to claim 1, wherein the low boiling base oil is a hydrocarbon solvent having a boiling point of about 30 to 110 ° C.
である特許請求の第１項記載の磁性流体の製造法。3. The method for producing a magnetic fluid according to claim 1, wherein the high-boiling base oil is a higher alkyl-substituted naphthalene.
エステルである特許請求の範囲第１項記載の磁性流体の
製造法。4. The method for producing a magnetic fluid according to claim 1, wherein the high-boiling base oil is a dicarboxylic acid di-higher alkyl ester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152151A JPH0765063B2 (en) | 1986-06-27 | 1986-06-27 | Magnetic fluid manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152151A JPH0765063B2 (en) | 1986-06-27 | 1986-06-27 | Magnetic fluid manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS638488A JPS638488A (en) | 1988-01-14 |
| JPH0765063B2 true JPH0765063B2 (en) | 1995-07-12 |
Family
ID=15534141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61152151A Expired - Lifetime JPH0765063B2 (en) | 1986-06-27 | 1986-06-27 | Magnetic fluid manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765063B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4849152B2 (en) * | 2009-05-15 | 2012-01-11 | 株式会社ブレスト工業研究所 | Anti-condensation plate holder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58174495A (en) * | 1982-04-07 | 1983-10-13 | Nippon Seiko Kk | Preparation of magnetic fluid |
-
1986
- 1986-06-27 JP JP61152151A patent/JPH0765063B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS638488A (en) | 1988-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |