KR980000562A - Magnetic fluid manufacturing method - Google Patents

Magnetic fluid manufacturing method Download PDF

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Publication number
KR980000562A
KR980000562A KR1019960020416A KR19960020416A KR980000562A KR 980000562 A KR980000562 A KR 980000562A KR 1019960020416 A KR1019960020416 A KR 1019960020416A KR 19960020416 A KR19960020416 A KR 19960020416A KR 980000562 A KR980000562 A KR 980000562A
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South Korea
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fine powder
magnetic fine
magnetic
group
layer
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KR1019960020416A
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Korean (ko)
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KR100203023B1 (en
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장경오
손홍재
허원도
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문창호
삼화전자공업 주식회사
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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
    • H01F1/445—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 compound, e.g. Fe3O4
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Lubricants (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

본 발명은 자성 미분말의 입자 표면에 계면활성제를 단분자층 흡착시켜 자성유체를 제조하는 방법에 관한것으로서, 광유에 대해서 자성 미분말을 안정적으로 분산시킬 수 있도록 하여, 특히 스피커용 쿨링재로서 우수한 성질을 지닌 자성유체 제조방법의 제공을 목적으로 한다.The present invention relates to a method for producing a magnetic fluid by adsorbing a monolayer on a surface of particles of a magnetic fine powder, wherein the magnetic fine powder can be stably dispersed in mineral oil, and particularly a magnetic material having excellent properties as a cooling material for a speaker. An object of the present invention is to provide a fluid production method.

상기 목적을 달성하기 위하여, 본 발명에서는 자성 미분말에 흡착시키기 위한 계면활성제로서 바람직하게는 COOH기, OH기, SO₃H기 등의 극성기를 다수개 지님과 아울러 탄소수가 10이상인 리놀렌산 소다와 같은 불포화 지방산 이온이 제공된다. 흡착과정에서 먼저 리놀렌산을 2분자자층 이상 흡착시킨 다음, 상기 미분말에 산을 적하하여 상기 2분자층을 제거하고, 미분말을 응집시켜 침강법, 여과법 등에 의하여 미분말을 회수한 다음 세정, 건조함으로써 응집물인 표면 소수성 자성 미분말 케이크(cake)를 얻는다. 상기 케이크를 용매인 광유, 예컨대 스핀들 오일, 또는 스핀들오일과 마레인기가 부착된 마레인화 폴리부텐을 일정비율 혼합한 것이나, 액체 파라핀과 마레인화 폴리부텐을 일정비율 혼합하여 이루어진 것을 사용하여 분산시킴으로서 자성유체를 제조한다.In order to achieve the above object, in the present invention, as a surfactant for adsorbing on the magnetic fine powder, unsaturated fatty acid ions such as linolenic acid soda having 10 or more carbon atoms as well as having a plurality of polar groups such as COOH group, OH group and SO₃H group This is provided. In the adsorption process, linolenic acid is first adsorbed onto at least two molecular layers, and then acid is added to the fine powder to remove the two molecular layers, and the fine powder is agglomerated to recover the fine powder by sedimentation or filtration, and then washed and dried. A surface hydrophobic magnetic fine powder cake is obtained. Magnetically disperse the cake by dispersing the solvent using mineral oil such as spindle oil, or a mixture of spindle oil and marinized polybutene with a marin group, or a mixture of liquid paraffin and marinized polybutene in a certain ratio. Prepare the fluid.

Description

자성유체 제조방법Magnetic fluid manufacturing method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

Claims (4)

자성 미분말의 각 입자표면을 탄소수가 10이상이고, COOH기, OH기, SO₃H기의 극성기를 다수개 가지는 리놀렌산 소다로 단분자층 흡착하여 응집시켜 표면 소수성 자성 미분말 케이크를 만드는 단계와, 상기 자성 미분말 케이크를 스핀들 오일 용매에 분산시키는 단계를 포함함을 특징으로 하는 자성유체 제조방법.The surface of each particle of the magnetic fine powder has a carbon number of 10 or more, and a monomolecular layer is adsorbed with a linoleic acid soda having a plurality of polar groups of COOH group, OH group and SO₃H group to aggregate to form a surface hydrophobic magnetic fine powder cake, and the magnetic fine powder cake Magnetic fluid manufacturing method comprising the step of dispersing in the spindle oil solvent. 제1항에 있어서, 자성 미분말의 표면에 리놀렌산을 흡착시킬 때, NaOH를 소정량 첨가하여 2분자층 흡착시켜 친수성 자성 미분말을 이룬 다음, 이 용액에 3N HCL을 첨가하여 교반함으로써 상기 2분자층을 제거함으로써 리놀레산이 단분자층 흡착된 표면 소수성 자성 미분말을 형성함을 특징으로 하는 자성유체 제조방법.The method of claim 1, wherein when adsorbing linolenic acid on the surface of the magnetic fine powder, a predetermined amount of NaOH is added to adsorb the two-molecule layer to form a hydrophilic magnetic fine powder, and then the 2 molecular layer is stirred by adding and stirring 3N HCL to the solution. And removing linoleic acid to form a surface hydrophobic magnetic fine powder adsorbed to a monomolecular layer. 자성 미분말의 각 입자표면을 탄소수가 10이상이고, COOHRL, OH기, SO₃H기의 극성기를 다수개 가지는 리놀렌산 소다로 단분자층 흡착하여 응집시켜 표면 소수성 자성 미분말 케이크를 만드는 단계와, 상기 자성 미분말 케이크를 스핀들 오일과 마레인화 폴리부텐가 일정비율 섞여 이루어진 용매에 분산시키는 단계를 포함함을 특징으로 하는 자성유체 제조방법.The surface of each particle of the magnetic fine powder has a carbon number of 10 or more, and a monomolecular layer is adsorbed and aggregated with linolenic acid soda having a plurality of polar groups of COOHRL, OH, and SO₃H groups to make a surface hydrophobic magnetic fine powder cake, and the magnetic fine powder cake is a spindle. A process for producing a magnetic fluid, characterized in that it comprises the step of dispersing in a solvent a mixture of oil and marinized polybutene in a certain ratio. 제4항에 있어서, 자성 미분말의 표면에 리놀레산을 흡착시킬 때, NaOH를 소정량 첨가하여 2분자층 흡착시켜 친수성 자성 미분말을 이룬 다음, 이 용액에 3N HCL을 첨가하여 교반함으로써 상기 2분자층을 제거함으로써 리놀렌산이 다분자층 흡착된 표면 소수성 자성 미분말을 형성함을 특징으로 하는 자성유체 제조방법.The method of claim 4, wherein when adsorbing linoleic acid on the surface of the magnetic fine powder, NaOH is added in a predetermined amount to adsorb the two-molecule layer to form a hydrophilic magnetic fine powder, and then the 2 molecular layer is stirred by adding 3N HCL to the solution. And removing the linolenic acid to form the surface hydrophobic magnetic fine powder adsorbed on the multimolecular layer. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019960020416A 1996-06-08 1996-06-08 Method for preparing magnetic fluid KR100203023B1 (en)

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KR980000562A true KR980000562A (en) 1998-03-30
KR100203023B1 KR100203023B1 (en) 1999-06-15

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