JPS638488A - Production of magnetic fluid - Google Patents
Production of magnetic fluidInfo
- Publication number
- JPS638488A JPS638488A JP61152151A JP15215186A JPS638488A JP S638488 A JPS638488 A JP S638488A JP 61152151 A JP61152151 A JP 61152151A JP 15215186 A JP15215186 A JP 15215186A JP S638488 A JPS638488 A JP S638488A
- Authority
- JP
- Japan
- Prior art keywords
- base oil
- low
- boiling
- boiling point
- magnetic fluid
- 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
- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000002199 base oil Substances 0.000 claims abstract description 48
- 238000009835 boiling Methods 0.000 claims abstract description 45
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 9
- 239000004094 surface-active agent Substances 0.000 claims abstract description 8
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 3
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 3
- 150000002790 naphthalenes Chemical class 0.000 claims abstract description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims abstract 2
- -1 alkyl dicarboxylic acid ester Chemical class 0.000 claims 1
- 239000010419 fine particle Substances 0.000 claims 1
- 239000011882 ultra-fine particle Substances 0.000 abstract description 10
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- ZHGIKBCGOGBDFG-UHFFFAOYSA-N 1-icosylnaphthalene Chemical compound C1=CC=C2C(CCCCCCCCCCCCCCCCCCCC)=CC=CC2=C1 ZHGIKBCGOGBDFG-UHFFFAOYSA-N 0.000 description 4
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 description 2
- ZFMQKOWCDKKBIF-UHFFFAOYSA-N bis(3,5-difluorophenyl)phosphane Chemical compound FC1=CC(F)=CC(PC=2C=C(F)C=C(F)C=2)=C1 ZFMQKOWCDKKBIF-UHFFFAOYSA-N 0.000 description 2
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- QYWXVBFLPIGNNL-UHFFFAOYSA-L disodium butanedioate 1-octylsulfonyloctane Chemical compound [Na+].[Na+].[O-]C(=O)CCC([O-])=O.CCCCCCCCS(=O)(=O)CCCCCCCC QYWXVBFLPIGNNL-UHFFFAOYSA-L 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical compound [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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)
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。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing magnetic fluids. For more details,
The present invention relates to a method for producing a magnetic fluid in which ultrafine ferrite particles adsorbed with a surfactant are dispersed in a desired high-boiling 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１−１Ｎｉ−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（商品名磁性
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ｖｉ：Ｍ！シた後、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生が悪化するために
、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 (magnetite, Mn-ferrite 1-1Ni-ferrite,
Sodium oleate,
By adding various surfactants such as sodium dioctyl sulfone succinate (trade name: Magnetic Aerosol OT) and heating this at 90°C for 30 minutes, the surfactant is adsorbed onto the ferrite ultrafine particles. , this surfactant-adsorbed ferrite ultrafine particles are depressurized vi:M! After oxidation, higher alkyl-substituted naphthalenes such as eicosylnaphthalene, dicarboxylic acid di-higher alkyl esters such as dioctyl sebacate and dioctyl adipate have a boiling point of about 150.
Conventionally, dispersion has been carried out in a high boiling point base oil at a temperature of 0.degree. C. or higher while irradiating ultrasonic waves. This is because when the magnetic fluid is concentrated, the dispersion stability of the ultrafine particles deteriorates, so a base oil with a low vapor pressure and a high boiling point is used to prevent concentration due to evaporation of the base oil. However, if such a dispersion method is used, these base oils do not penetrate into the agglomerated powder, so 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, the present inventors investigated a method of dispersing surfactant-adsorbed ultrafine ferrite particles into a desired high-boiling point base oil, and found that the ultrafine ferrite particles, which were once dispersed in a low-boiling point base oil, were dispersed in a solvent base oil. We have found that the method of dispersing in high-boiling base oil using the substitution method described above 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 includes dispersing a low-boiling point base oil dispersion of ultrafine ferrite particles adsorbed with a surfactant into a low-boiling point base oil having compatibility with the low-boiling point base oil. It is also carried out by a solvent base oil displacement method in which low boiling point base oil is evaporated by dropping it into high boiling point 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３（１−１５０℃。As ultrafine ferrite particles adsorbed with a surfactant, conventionally known ones can be used as they are after drying, and these can be used as they are with a low boiling point base oil, preferably a base oil with a boiling point of about 3 (1-150°C) such as cyclohexane or toluene. .
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／ｍ１２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。Preferably, it is once dispersed in a hydrocarbon solvent at about 30 to 110°C. Here, the ultrafine particle concentration is generally about 0°1~
A low boiling point base oil is used to give 1.3 g/m12. If the concentration is higher than this, the ultrafine ferrite particles will gel and will no longer form a magnetic liquid.
次いで、この低沸点基油分散物（磁性流体）を。Next, this low boiling point base oil dispersion (magnetic fluid).
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。A high boiling point base oil that is compatible with the low boiling point base oil in an amount corresponding to the ultimately required ultrafine particle concentration of the magnetic fluid,
When dropped into something heated to about 150°C or higher, such as eicosylnaphthalene heated to 270°C, dioctyl sebacate heated to 200°C, or dioctyl adipate heated to 180°C, the reaction temperature will exceed this heating temperature. Low-boiling base oils with fairly low boiling points are evaporated off simultaneously with the dropwise addition, and replacement of such solvent base oils yields high-boiling base oil-dispersed magnetic fluids.
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 surfactant-adsorbed ferrites are once dispersed in a low-boiling point base oil, and this is replaced with a high-boiling point base oil by a solvent base oil substitution method, thereby creating a low-boiling point base oil-dispersed magnetic material. 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 explained with reference to examples.
実施例
ＦａＣｌ、・ｎＨ，０２０ｇおよびＦｅＣ１，・６Ｈ，
０５０ｇをそれぞれ水Ｌｏｏｍ Ｑに溶解させた後混合
し、そこに６Ｎ ＮａＯＨ水溶液をｐｌ−１１１になる
迄、１０ｍ０７分の滴下速度で攪拌下に滴下する。滴下
終了後、１００°Ｃ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５０
０ｍ Ｑとした後、そこにオレイン酸ナチリウム６ｇを
加え、９０℃で３０分間加熱してから水で洗浄し、乾燥
する。Examples FaCl, .nH, 020 g and FeCl, .6H,
After dissolving 050 g of each in water Loom Q, they are mixed, and a 6N NaOH aqueous solution is added dropwise thereto while stirring at a dropping rate of 10 m07 min until the pl-111. After the dropwise addition is completed, the mixture is heated under reflux at 100°C for 30 minutes, cooled, and washed with water. The total volume of washed aqueous suspension was
After setting the temperature to 0 mQ, 6 g of sodium oleate was added thereto, heated at 90° C. for 30 minutes, washed with water, and dried.
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Ｌｏｏｍ Ｑに分散させ、飽和磁化３．
４ Ｘ １０−’Ｔ（１，３にＡ／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 cyclohexane Loom Q to obtain a saturation magnetization of 3.
A magnetic fluid of 4×10-'T (when A/m was applied to 1 and 3) was obtained.
この磁性流体１００ｕ＋ Ｑを、２７０℃のエイコシル
ナフタリン中に毎分１０ｍ Ｑ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 Ｘ １Ｏ−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 u+ Q of this magnetic fluid is dropped into eicosylnaphthalene at 270°C at a dropping rate of 10 m/min, cyclohexane evaporates at the same time as the dropping, and the solvent base oil is quickly replaced, resulting in a saturation magnetization of 3.4 X 1O-3T
A high boiling point base oil-dispersed magnetic fluid was obtained (at the time of application of 1°3 KA/m).
比較例
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１００ｍＱ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 23g of surfactant-adsorbed magnetite ultrafine particles used in the example were added to 100mQ of eicosylnaphthalene,
Ultrasonic irradiation was performed, but almost no dispersion occurred.
Claims (1)
点基油分散物を、該低沸点基油と相溶性を有しかつ約１
５０℃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。 ２、低沸点基油が沸点約３０〜１１０℃の炭化水素溶剤
である特許請求の範囲第１項記載の磁性流体の製造法。 ３、高沸点基油が高級アルキル置換ナフタリンである特
許請求の第１項記載の磁性流体の製造法。 ４、高沸点基油がジカルボン酸ジ高級アルキルエステル
である特許請求の範囲第１項記載の磁性流体の製造法。[Claims] 1. A low-boiling point base oil dispersion of ferrite fine particles adsorbed with a surfactant, which has compatibility with the low-boiling point base oil and about 1.
A method for producing a magnetic fluid, which comprises evaporating a low boiling point base oil by dropping it into a high boiling point base oil heated to 50° C. or higher to replace the solvent base oil. 2. The method for producing a magnetic fluid according to claim 1, wherein the low boiling point base oil is a hydrocarbon solvent having a boiling point of about 30 to 110°C. 3. The method for producing a magnetic fluid according to claim 1, wherein the high-boiling base oil is a higher alkyl-substituted naphthalene. 4. The method for producing a magnetic fluid according to claim 1, wherein the high-boiling base oil is a dihigher alkyl dicarboxylic acid 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 true JPS638488A (en) | 1988-01-14 |
| JPH0765063B2 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010266007A (en) * | 2009-05-15 | 2010-11-25 | Burest Kogyo Kenkyusho Co Ltd | Holder for dew condensation preventing plate |
Citations (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
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58174495A (en) * | 1982-04-07 | 1983-10-13 | Nippon Seiko Kk | Preparation of magnetic fluid |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010266007A (en) * | 2009-05-15 | 2010-11-25 | Burest Kogyo Kenkyusho Co Ltd | Holder for dew condensation preventing plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0765063B2 (en) | 1995-07-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |