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WO2006132252A1 - Fluide magnétique - Google Patents

Fluide magnétique Download PDF

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Publication number
WO2006132252A1
WO2006132252A1 PCT/JP2006/311338 JP2006311338W WO2006132252A1 WO 2006132252 A1 WO2006132252 A1 WO 2006132252A1 JP 2006311338 W JP2006311338 W JP 2006311338W WO 2006132252 A1 WO2006132252 A1 WO 2006132252A1
Authority
WO
WIPO (PCT)
Prior art keywords
cation
acid
magnetic fluid
group
salt
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.)
Ceased
Application number
PCT/JP2006/311338
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English (en)
Japanese (ja)
Inventor
Yasuhiro Shindo
Ichiro Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Chemical Industries Ltd
Original Assignee
Sanyo Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Chemical Industries Ltd filed Critical Sanyo Chemical Industries Ltd
Priority to JP2007520129A priority Critical patent/JPWO2006132252A1/ja
Publication of WO2006132252A1 publication Critical patent/WO2006132252A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/223—Five-membered rings containing nitrogen and carbon only
    • C10M2215/224—Imidazoles
    • C10M2215/2245—Imidazoles used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/14—Group 7
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/16—Groups 8, 9, or 10
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/077—Ionic Liquids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • C10N2040/185—Magnetic fluids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/34—Lubricating-sealants

Definitions

  • the present invention relates to a ferrofluid and a ferrofluid vacuum seal using the same.
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-5307
  • Patent Document 2 Japanese Patent Laid-Open No. 10-154614
  • an object of the present invention is to provide a sealing material that can obtain a high degree of vacuum.
  • the present invention is a magnetic fluid comprising magnetic fine particles (P), a dispersant (V) and an ionic liquid (I), and a magnetic fluid vacuum seal using the magnetic fluid.
  • the magnetic fluid of the present invention comprises magnetic fine particles (P), a dispersant (V) and an ionic liquid (I), the vapor pressure can be lowered. Thereby, if the magnetic fluid of the present invention is used for a sealing material for vacuum seals, a high degree of vacuum can be realized.
  • the dispersant (V) has a function of increasing the affinity of the ionic liquid (I) for the magnetic fine particles (P) and preventing the aggregation of (P).
  • the compound (al) having two or more key-on groups in the molecule hereinafter also referred to as a key-on group-containing compound (al)
  • at least one compound Organic cations (bl) and Z or at least one metal cation (b2) capable compound hereinafter also referred to as a key-on group-containing compound (al)
  • at least one compound Organic cations (bl) and Z or at least one metal cation (b2) capable compound hereinafter also referred to as a key-on group-containing compound (al)
  • examples thereof include a compound having a group (al), at least one metal cation (b2), a salt having a parent ion liquid moiety (S1 ′), and a combination thereof.
  • the above-mentioned salt (S1) is preferred, and the above-mentioned salt (S1) and a compound having one anion group in the molecule (a2) (hereinafter referred to as an anion group-containing compound (a2)) And a salt (S2) composed of a metal cation (b2) and having a hydrophilic magnetic fine particle site is more preferred.
  • the dispersant (V) of the present invention comprises a compound (al) having two or more key-on groups in the molecule, at least one organic cation (bl), and at least one metal cation. It may be a salt (S3) consisting of (b2)! /.
  • the cation group contained in the above cation group-containing compound (al) and (a2) is a carboxylic acid group, a sulfonate group. And so on.
  • ⁇ ⁇ -on group-containing compound (al) is not particularly limited, but a compound containing 2 to 8 or more ⁇ ⁇ -on groups is preferable.
  • Specific examples include arone derived from the following organic compounds, and two or more of them may be used in combination.
  • Aliphatic polycarboxylic acid having 2 to 30 carbon atoms (oxalic acid, malonic acid, succinic acid, dartaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, propane-1,2,3-tricarboxylic acid, Saturated polycarboxylic acids such as citrate and dodecanedioic acid; unsaturated polycarboxylic acids such as maleic acid, fumaric acid and itaconic acid);
  • C8-C30 aromatic polycarboxylic acid (phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid, etc.); C3-C30 cycloaliphatic polycarboxylic acids (cyclobutene 1,2 dicarboxylic acid, cyclopentene 1,2 dicanolevonic acid, furan 2,3 dicanolevonic acid, bicyclo [2,2,1] 2,3 dicarboxylic acid, bicyclo [2,2,1] hepter 2,5 gen 2,3-dicanolevonic acid, etc.).
  • C1-C30 aliphatic polysulfonic acid (methionic acid, 1,1-ethanedisulfonic acid, 1,2-ethanedisulfonic acid, 1,1-propanedisulfonic acid, 1,3 propanedisulfonic acid, polyvinylsulfonic acid, etc. );
  • Aromatic polysulfonic acid having 6 to 30 carbon atoms (m benzenedisulfonic acid, 1,4 naphthalenesulfonic acid, 1,5 naphthalene disulfonic acid, 1,6 naphthalene disulfonic acid, 2, 6 naphthalene disulfonic acid, 2, 7 Naphthalene senorephonic acid, snorephone styrene, etc.); bis (fluorosulfol) imide, bis (trifluoromethanesulfol) imide, etc.).
  • (a 3) An organic compound having at least one carboxyl group and one sulfo group each C2-30 sulfocarboxylic acid (sulfoacetic acid, sulfosuccinic acid, etc.); C7-30 sulfoaromatic mono- or polycarboxylic acid (O sulfobenzoic acid, m sulfobenzoic acid, p sulfobenzoic acid, 2,4 disulfobenzoic acid, 3 sulfophthalic acid, 3,5 disulfophthalic acid, 4-sulfoisophthalic acid, 2-sulfoterephthalic acid, 2-methyl-4 sulfo Benzoic acid, 2-methyl-3,5 disulfobenzoic acid, 4 propyl 3 sulfobenzoic acid, 4 isopropyl 3 sulfobenzoic acid, 2, 4, 6 Trimethyl 3 sulfosulfobenzoic acid, 2-methyl-5-sul
  • the compound (a2) having one anion group in the molecule is not particularly limited, but is an aliphatic, alicyclic, or aromatic monocarboxylic acid; aliphatic, alicyclic, or aromatic And sulfonic acid. Specific examples include anions derived from the following organic compounds, and two or more may be used in combination.
  • Aliphatic saturated monocarboxylic acids (formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, strong prillic acid, verargonic acid, lauric acid, myristic acid, stearyl Acid, behenic acid, etc.); aliphatic unsaturated monocarboxylic acids (acrylic acid, methacrylic acid, oleic acid, stearic acid, etc.); oxyaliphatic monocarboxylic acids (glycolic acid, lactic acid, tartaric acid, etc.) ); Alicyclic monocarboxylic acid (cyclopentanecarboxylic acid, cyclohexanecarboxylic acid, etc.); aromatic monocarboxylic acid (benzoic acid, cinnamate, naphthoic acid, etc.); oxyaromatic monocarboxylic acid (salicylic acid, mandel) Acid), trifluoro
  • Aliphatic monosulfonic acid (methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butansnorephonic acid, hexenorephonic acid, decansnorephonic acid, undecanesnorephonic acid, dodecanesulfonic acid, etc.); aromatic monosulfonic acid (benzenesulfonic acid) P-toluenesulfonic acid, o-toluenesulfonic acid, m-toluenesulfonic acid, 4-dodecylbenzenesulfonic acid, 4-octylbenzenesulfonic acid, naphthalenesulfonic acid, etc.), trifluromethane senorephonic acid, etc.
  • aromatic monosulfonic acid (benzenesulfonic acid) P-toluenesulfonic acid, o-toluenesulfonic acid
  • the organic cation (bl) constituting the dispersant (V) is not particularly limited. Examples thereof include (1) an imidazolium cation, (2) an imidazolium cation, and (3) a pyridinium. Cations, (4) alicyclic quaternary ammonium cations, (5) aliphatic quaternary ammonium cations, and the like, and two or more of these may be used in combination.
  • the metal of the metal cation (b2) constituting the dispersant (V) is not particularly limited, for example, Group 1A (lithium, sodium, potassium, etc.), Group 2A (beryllium, magnesium, calcium, etc.) , Group 3A (Yttrium, Lanthanum, Cerium, Praseodymium, Neodymium, Tellurium, Bismuth, Gadolinium, Terbium, Holmium, Erbium, Pium, etc.), Group 4A (Titanium, Zirconium, etc.), Group 5A (Vanadium, Niobium, etc.), Group 6A (chromium, molybdenum, etc.), Group 7A (manganese, technetium, etc.), Group 8 (iron, cobalt, nickel, ruthenium, rhodium, rhodium, etc.), Group 1B (copper, silver, gold, etc.) ), 2B group (such as zinc, cadmium and mercury), 3B group
  • Group 1A and Group 2A metals are preferred, more preferably lithium, sodium, potassium, beryllium, magnesium, and It is calcium.
  • dispersing agent (V) examples include salts obtained by appropriately combining the above-described cation group-containing compound (al) and an organic cation (bl), and two or more kinds are used in combination. May be. Examples include dodecanedioic acid monobis (1-ethyl-3-methylimidazolium) salt, dodecanedioic acid- (1-methyl-3-ethylimidazolium) 'sodium salt, dodecanedioic acid bis ( 1 butyl 3-methylimidazolium) salt, dodecanedioic acid 1 butyl 3-ethyl imidazolium) 'sodium salt, sebacin diacid-bis (1-ethyl-3-methylimidazolium) salt, sebacin diacid- ( 1-methyl-3-ethyl imidazolium) 'sodium salt.
  • the method for producing the dispersant (V) is not particularly limited.
  • dodecanedioic acid-bis (1-ethyl-3-methylimidazolium) salt dodecanedioic acid and It can be obtained by mixing 1-ethyl 3-methylimidazole monomethyl carbonate.
  • the content (% by weight) of the dispersant (V) in the magnetic fluid of the present invention is not particularly limited, but the viewpoint of dispersion stability is preferably 0.1 to 20%, more preferably 0. It is 5 to 15%, particularly preferably 1 to 10%.
  • the ionic liquid (I) used in the present invention is a salt which also has a cation (c) and a cation (d) force, and is a liquid salt near room temperature.
  • Ionic liquids also called room temperature molten salts, have a lower melting point than ordinary salts, which have a higher melting point.
  • the melting point of the ionic liquid is not particularly limited as long as it meets the purpose of the present invention.For example, in the present invention, when a vacuum seal using a magnetic fluid is used at room temperature, the melting point is 25 ° C. or less.
  • the heating environment is equipped with a heating device in the environment to be used and the vacuum seal device This sufficiently achieves the object of the present invention.
  • the ionic liquid (I) in the present invention is preferably one in which at least one of a cation and a cation is an organic ion.
  • the ionic liquid (I) is not particularly limited, but (1) imidazolium salt, (2) imidazolium salt, (3) pyridinium salt, (4) alicyclic quaternary ammonium salt, (5) Examples of such salts include quaternary ammonium salts such as aliphatic quaternary ammonium salts, and two or more of them may be used in combination.
  • the ion (d) constituting the ionic liquid (I) is not particularly limited as long as it forms an ionic liquid by stringing with the cation (c). Examples thereof include a carboxyl group, two or more sulfo groups, or a one-one having one or more carboxyl groups and one or more sulfo groups.
  • arions derived from the organic compounds (a-1) to (a-5) described above and anions derived from the inorganic acid (a-6) exemplified below. Use two or more types together.
  • HBF HBF
  • HBF CF
  • HF HC1
  • HB HB
  • Inorganic acids such as HC1, A1C1, and HPF, and combinations of these acids.
  • Specific examples of the ionic liquid (I) include those that are liquid at room temperature among salts obtained by appropriately combining the above-mentioned cation and cation so that at least one of them becomes an organic ion.
  • preferred examples of the ionic liquid include (1) imidazolium salt, (3) pyridinium salt, (4) alicyclic quaternary ammonium salt, and (5) aliphatic quaternary ammonium salt.
  • a specific example of the anion is shown below.
  • TFSI bis (trifluoromethanesulfonyl) imide.
  • Liquid means liquid at 25 ° C.
  • TFSI bis (trifluoromethanesulfol) imide. Liquid means liquid at 25 ° C.
  • TFSI bis (trifluoromethanesulfonyl) imide. Liquid means liquid at 25 ° C.
  • TFSI bis (trifluoromethanesulfonyl) imide.
  • Liquid means liquid at 25 ° C.
  • the molecular weight of the ionic liquid (I) is low in viscosity! From the point that when one is incorporated in a vacuum seal, the hermeticity can be improved, 50-: LOOO is more preferable, 52-800 is particularly preferable, and 55-500 is particularly preferable.
  • the magnetic fine particles (P) used in the present invention are not particularly limited. Specifically, the fine ferrite particles (magnetite (Fe 2 O 3), nickel ferrite HNiO′Fe 2 O 3), manganese ferrite
  • Nikkenore monozinc ferrite Ni.
  • (P) is preferably ferrite fine particles from the viewpoint of magnetic properties.
  • the volume average particle size of the magnetic fine particles (P) is preferably 3 to 50 nm, more preferably 4 to 40 nm, and particularly preferably 5 to 30 nm, from the viewpoint of manufacturability and magnetism.
  • the volume average particle size of (P) is a value obtained by measurement by the X-ray small angle scattering method.
  • trade name: RINT2500 manufactured by Rigaku Corporation
  • Examples of the shape of the magnetic fine particles (P) include a true spherical shape, a spindle shape, a plate shape, and a needle shape, which are not particularly limited.
  • the projected image of (P) can be taken with a scanning electron microscope (SEM), for example.
  • the magnetic fine particles (P) there is no particular limitation, specifically, a coprecipitation method or the like. I can get lost.
  • the content (% by weight) of (P) in the magnetic fluid of the present invention is not particularly limited, but is preferably 5 to 50%, more preferably 10 to 45, from the viewpoint of the viscosity and magnetic properties of the magnetic fluid. %, Particularly preferably 15 to 40%.
  • Examples of the method of dispersing the magnetic fine particles (P) include, for example, an emulsifier (homomixer, disperser, high-pressure homogenizer, static mixer, colloid mill, etc.), membrane emulsifier (film mix, etc.), ultrasonic dispersion Machine (ultrasonic homogenizer, etc.).
  • an organic solvent or the like may be added, and the organic solvent used after preparation may be distilled off.
  • Specific examples include ester solvents (such as ethyl acetate and butyl acetate), ketone solvents (such as acetone and methyl ethyl ketone), alcohol solvents (such as methanol and ethanol), and the like.
  • the amount (% by weight) of the solvent added is preferably 10% or less, more preferably 5% or less, based on the magnetic fluid.
  • the magnetic fluid vacuum seal of the present invention comprises magnetic fine particles (P), a dispersant (V), and an ionic liquid.
  • a vacuum seal using the magnetic fluid of the present invention which also has a force.
  • Specific vacuum seals include, for example, vacuum magnetic fluid seals, especially semiconductor manufacturing and space seals that require a high degree of vacuum.
  • Example 1 with dispersants (V-1) to (V-3), sodium oleate, ionic liquids (I1) to (I3), and magnetite fine particles (P-1) at the mixing ratios shown in Table 5.
  • dispersion treatment was performed to obtain magnetic fluids (2) to (6).
  • Example 5 1-ethyl 3-methylimidazolium 'tetrafluoroborate (Aldrich; melting point: 15 ° C) was used as the ionic liquid in Example 5, and (I-3) was used in Example 6. 1-butyl-3-methylimidazole acetate (Aldrich; melting point—20 ° C.) was used.
  • Alkylnaphthalene-dispersed magnetic fluid [Sigma 200, A-200] was used as it was as magnetic fluid (7).
  • Perfluoropolyether dispersed magnetic fluid [F-210, manufactured by Sigma High Chemical Co., Ltd.] was used as it was as magnetic fluid (8).
  • the magnetic fluid of the present invention has a low vapor pressure with a low volatile content as compared with the conventional synthetic oil-based magnetic fluid of the comparative example.
  • the magnetic fluid of the present invention does not contain a volatile substance and has a low vapor pressure. And useful. It can also be used for bearing lubricants and dust seals using magnetic force. Since the magnetic fluid of the present invention has an extremely low vapor pressure, it is particularly useful as a sealing material for manufacturing semiconductors or space that requires a high degree of vacuum.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Soft Magnetic Materials (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

L’invention concerne un matériau d’étanchéité capable d’atteindre un degré de vide élevé, adapté à une utilisation en tant que joint d’étanchéité pour un vide élevé. L’invention concerne plus particulièrement un joint d’étanchéité de vide à fluide magnétique utilisant un fluide magnétique composé de microparticules magnétiques (P), d’agent de dispersion (V) et de liquide ionique (I). En tant qu’agent de dispersion (V), il est préférable d’utiliser du sel (S) consistant de composé (a1) ayant deux groupes anioniques ou plus dans chaque molécule et de cation organique (b1) en combinaison avec du sel (S2) consistant de composé (a2) ayant un groupe anionique dans chaque molécule et de cation métallique (b2). Dans le liquide ionique (I), il est préférable d’utiliser au moins un membre sélectionné parmi le groupe consistant des sels d’imidazolium, des sels d’ammonium quaternaire alicyclique, des sels d’ammonium quaternaire aliphatique et des sels de pyridinium.
PCT/JP2006/311338 2005-06-07 2006-06-06 Fluide magnétique Ceased WO2006132252A1 (fr)

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JP2007520129A JPWO2006132252A1 (ja) 2005-06-07 2006-06-06 磁性流体

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JP2005-166309 2005-06-07
JP2005166309 2005-06-07

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WO2006132252A1 true WO2006132252A1 (fr) 2006-12-14

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Cited By (8)

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JP2007258622A (ja) * 2006-03-27 2007-10-04 Sanyo Chem Ind Ltd 磁性ナノ粒子複合体
US20090134354A1 (en) * 2005-06-27 2009-05-28 Emmanuelle Dubois Conducting Fluid Containing Micrometric Magnetic Particles
JP2010508667A (ja) * 2006-11-07 2010-03-18 スティッチング ダッチ ポリマー インスティテュート 磁性流体およびそれらの使用
JP2010073453A (ja) * 2008-09-18 2010-04-02 Jeol Ltd 真空シール方法及び真空装置
EP2127513A4 (fr) * 2007-03-22 2011-03-30 3M Innovative Properties Co Matériau et feuille anti-onde électromagnétique
JP2012191150A (ja) * 2011-03-09 2012-10-04 Hiroshi Kashihara 強磁性有機磁性流体
RU2558726C2 (ru) * 2007-12-20 2015-08-10 Проайоник Продакшн Оф Айоник Сабстансиз Гмбх Энд Применение магнитных ионных жидкостей в качестве экстрагирующего средства
CN105529126A (zh) * 2016-02-02 2016-04-27 遵义医学院 一锅法制备纳米水基磁流体

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