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EP2067147B1 - Formulation magnétorhéologique - Google Patents

Formulation magnétorhéologique Download PDF

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Publication number
EP2067147B1
EP2067147B1 EP07820293A EP07820293A EP2067147B1 EP 2067147 B1 EP2067147 B1 EP 2067147B1 EP 07820293 A EP07820293 A EP 07820293A EP 07820293 A EP07820293 A EP 07820293A EP 2067147 B1 EP2067147 B1 EP 2067147B1
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EP
European Patent Office
Prior art keywords
methylimidazolium
ethyl
magnetorheological
magnetorheological formulation
particles
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EP07820293A
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German (de)
English (en)
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EP2067147A1 (fr
Inventor
Christoffer Kieburg
Jürgen PFISTER
Claus Gabriel
Günter OETTER
Martin Laun
Rene Lochtman
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BASF SE
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BASF SE
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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
    • H01F1/447—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of magnetic liquids, e.g. ferrofluids characterised by magnetoviscosity, e.g. magnetorheological, magnetothixotropic, magnetodilatant liquids
    • 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

Definitions

  • the present invention relates to a magnetorheological formulation containing magnetisable particles dispersed in a liquid, to methods of making the magnetorheological formulation and to the use thereof.
  • Magnetorheological formulations are generally termed formulations which change their rheological properties under the action of a magnetic field. These are mostly suspensions of ferromagnetic, superparamagnetic or paramagnetic particles in a liquid.
  • hydrocarbons for example alkanes, alkenes, poly- ⁇ -olefins (PAO) or esters, polyesters, silicone oils, polyalkylene glycols or water.
  • PAO poly- ⁇ -olefins
  • Carbonyl iron powder - spherical iron particles between 1 and 30 ⁇ m in size - is frequently used as the magnetic component, although particles of other alloys ( WO 94/10691 ) or with an irregular shape ( WO 04/044931 or US 2004/140447 ).
  • a good usability of a magnetorheological formulation causes a low sedimentation tendency of the magnetizable particles used in the liquid. If sediments occur, they must be readily stirrable, ie easily redispersible, in order not to adversely affect the function of the apparatuses in which the magnetorheological formulation is used.
  • the formation of agglomerates and hard no longer redispersible sediments can be completely or partially circumvented by using suitable dispersants.
  • suitable dispersants For this purpose, polymers or surfactants are usually used.
  • US 5,683,615 describes the use of thiophosphorus and / or thiocarbamate compounds as dispersants for magnetisable particles to improve colloidal stability.
  • US 2004/0084651 describes oleates, naphthenates, sulfonates, phosphate esters, laurates, stearates, for example lithium hydroxystearate, stearic acid, glycerol monoleate, and fatty alcohols as dispersants.
  • US 2002/0130305 mentions as preferred surfactants ethoxylated alkylamines such as tallow fatty amine ethoxylate.
  • US 2003/0047705 claims ethoxylated and propoxylated alkylamines.
  • the known magnetorheological formulations usually contain a thixotropic agent, which builds up a yield point and thus counteracts sedimentation of the particles. The sediment hardness is reduced and the redispersibility of already sedimented particles is facilitated by such additives.
  • the prior art is the use of hydrophobically modified sheet silicates of the smectite type, especially of the montmorillonite type ( WO 01/03150 A1 ), a major constituent of bentonite, silica gel or disperse silica ( US 5,667,715 ) in nonpolar liquids.
  • carbon particles US 5,354,488
  • polyureas for this purpose
  • Magnetorheological formulations based on water are available in US 6,132,633 described and contain hydrophilic sheet silicates of the bentonite or hectorite type. Laponite, a synthetic hectorite-like layered silicate, is also mentioned for this purpose.
  • the transferable shear stress of a magnetorheological formulation increases with the proportion by weight of the magnetizable particles. Weight percentages of the magnetizable particles of 90% or more are desirable for individual applications. Strategies for maximizing the weight fractions and thus the transmittable shear stress below field relate to the fine-tuning of the particle sizes, possibly the use of particle diameters of different sizes ( WO 97/15058 ).
  • US 5,667,715 relates to a mixture of large and small iron particles to the ratio of the transferable shear stress with Magnetic field to maximize transferable shear stress without magnetic field. In any case, however, the densest sphere packing of the magnetizable particles and the intrinsic viscosity or shear stress increasing with the degree of pigmentation are limiting.
  • magnetorheological formulations are described with proportions of magnetizable particles that have a specific geometry. These particles in the form of platelets, needles, cylinders or in egg shape align themselves without the influence of a magnetic field in the direction of the flow direction of a liquid and therefore have a lower intrinsic viscosity compared to magnetorheological formulations with eg spherical particles at a comparable maximum shear stress under field.
  • magneto-rheological formulations based on poly- ⁇ -olefin show lower shear stresses than silicone-based MR formulations or even aqueous systems.
  • Polar additions to the liquid component of a magnetorheological formulation may contribute to improved shear stresses.
  • magnetorheological formulations such as water or polyalkylene glycols
  • Conventional polar liquids contained in magnetorheological formulations exhibit too high a viscosity or solidification at low temperatures below -20 ° C., and therefore are suitable for suitable magnetorheological formulations which make a high ratio of transferable shear stress with magnetic field more transferable Shear stress without magnetic field, from.
  • the formulations should show no instabilities or inhomogeneities, such as agglomeration or increased sedimentation, for example with the formation of hard, no longer redispersible sediments, which is due inter alia to the partial or complete loss of the dispersant.
  • the low viscosity, low viscosity liquids contained in the magnetorheological formulation have too high a vapor pressure at temperatures above 150 ° C. An evaporation of liquid fractions at high operating temperatures and thus a thickening of the magnetorheological formulation is the result.
  • the known magnetorheological formulations with liquids that can be exposed to high operating temperatures of over 170 ° C without affecting the magnetorheological formulation life are at temperatures below -20 ° C without applying a magnetic field too high viscosity, solidify amorphous or crystallize.
  • JP 2006 193686 A discloses a magnetorheological formulation containing an ionic liquid, magnetizable particles (with a diameter between 0.5 and 20 microns) and additives.
  • the ionic liquid may be selected from 1-butyl-3-methylimidazolium salts or 1-methyl-pyridinium salts.
  • a disadvantage of the known magnetorheological formulations is that they often do not have the desired combination of properties for the respective fields of application.
  • the individual components of the formulations - e.g. Base liquid, viscosity modifier, magnetizable particles, dispersants, thickeners, corrosion inhibitors and lubricants and others - should be coordinated for many applications so that the use of the formulation is guaranteed despite the high volume fractions of magnetizable particles.
  • An important feature is also a high resistance of the magnetorheological formulation to energy inputs resulting from use. The, energy is registered by high shear with and without magnetic field and manifests itself in high fluid temperatures, abrasion and physical and chemical fluid changes.
  • the magnetorheological formulation should be usable over a wide temperature range, for example, it should be liquid in particular embodiments at -40 ° C and without affecting the serviceability be exposed to over 150 ° C. Furthermore, it is a particular object of the invention to provide a magnetorheological formulation which is readily redispersible after the sedimentation of the magnetizable particles and can be transferred by the highest possible shear stresses when a magnetic field is applied. Furthermore, the rheological properties of the magnetorheological formulation should change as little as possible in the magnetic field as well as without application of a magnetic field after prolonged mechanical stress.
  • a magnetorheological formulation containing an ionic liquid containing anions and cations, dispersed magnetizable particles having a mean diameter between 0.1 and 500 microns and optionally additives, wherein the ionic liquid is selected from 1-butyl-3 -methylimidazolium methylsulfate, 1-ethyl-3-methylimidazolium ethylsulfate, 1-ethyl-3-methylimidazolium thiocyanate, 1-butyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methylimidazolium acetate, 1-butyl-3-methylimidazolium acetate, 1-ethyl-3 -methylpyridiniumethylsulfate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluo
  • the dispersed particles may be dispersed in a liquid consisting exclusively of the ionic liquid (100% by weight) or dispersed in a liquid which, in addition to the ionic liquid, contains further components, for example additives.
  • the ratio of the weight fraction of the ionic liquid to the weight fraction of the additives, based in each case on the total weight of the magnetorheological formulation is greater than 1, particularly preferably greater than 2.
  • additive denotes all components of the magnetorheological formulation which, in addition to the ionic liquid and the magnetizable particles are contained therein.
  • the formulation based on ionic liquids according to the invention contains a completely newly composed liquid which, unlike the liquids known from the prior art, contained in magnetorheological formulations, does not consist essentially of hydrocarbons, esters, polyethers, polyesters, silicone oils or water.
  • Inventive magnetorheological formulations show very high shear stresses when exposed to a magnetic field. Compared to a conventional magnetorheological formulation with comparable shear stress In the magnetorheological formulation according to the invention, a lower degree of pigmentation (fewer magnetisable particles per volume) can be used, which in turn means a lower viscosity of the magnetorheological formulation without a magnetic field. In addition, the temperature dependence of the shear stress in the magnetic field is significantly lower than that of magnetorheological formulations based on hydrophobic oils. Special magnetorheological formulations according to the invention are still flowable even at -40 ° C and at the same time chemically stable at temperatures above 180 ° C and have a very low evaporation loss.
  • ionic liquids Due to the polar character of ionic liquids can be dispensed in the dispersion of magnetizable particles with a hydrophilic surface, for example of iron particles, to surface-active additives or dispersants, so that chemical and physical changes in the magnetorheological formulation, for example, after long-term or continuous use occur due to changes such as the dispersant, not take place. Accordingly, the transferable shear stress of a magnetorheological formulation based on an ionic liquid with and without a magnetic field after continuous load tests is virtually unchanged, while magnetorheological formulations, for example based on poly- ⁇ -olefins, undergo a change in the shear stress.
  • Ionic liquids according to the present invention are selected from 1-butyl-3-methylimidazolium methylsulfate, 1-ethyl-3-methylimidazolium ethylsulfate, 1-ethyl-3-methylimidazolium thiocyanate, 1-butyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methylimidazolium acetate , 1-Butyl-3-methylimidazolium acetate, 1-ethyl-3-methylpyridinium ethylsulfate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium tetrafluoroborate, 1 Methyl 3-octylimidazolium hexafluorophosphat
  • ionic liquids have a viscosity of ⁇ 1000 mPas at 20 ° C. and are still liquid at temperatures below -20 ° C.
  • the magnetorheological formulation according to the invention contains magnetizable particles. These may be any magnetizable particles known in the art.
  • the magnetizable particles contained in the magnetorheological formulation according to the invention have an average diameter between 0.1 and 500 .mu.m, preferably between 0.1 and 100 .mu.m, particularly preferably between 1 and 50 .mu.m.
  • the shape of the magnetizable particles may be uniform or irregular. For example, they may be spherical, rod-shaped or needle-shaped particles. Preferably, magnetizable particles of largely spherical shape are used. Approximately spherical particles can be obtained, for example, by atomizing molten metals (spray powder, "atomized" powders).
  • magnetizable particles in particular of magnetizable particles having different particle size distribution and / or with different materials, can also be used for the present invention.
  • the magnetorheological formulation according to the invention preferably contains magnetizable particles selected from the group consisting of iron-containing particles, nickel-containing particles and cobalt-containing particles. These are, for example, particles of iron, iron alloys, iron oxides, iron nitrite, iron carbide, carbonyl iron, nickel, cobalt, stainless steel, silicon steel, alloys or mixtures thereof. However, it is also possible to contain particles, for example of chromium dioxide.
  • the magnetisable particles may have a coating, for example, an insulating or corrosion-inhibiting inorganic substance, e.g. Silicates, phosphates, oxides, carbides or nitrides, with other metals or iron powder coated with at least one polymer.
  • an insulating or corrosion-inhibiting inorganic substance e.g. Silicates, phosphates, oxides, carbides or nitrides, with other metals or iron powder coated with at least one polymer.
  • the magnetorheological formulation contains carbonyl iron powder (CEP) particles as magnetisable particles.
  • the carbonyl iron powder is preferably prepared by decomposition of iron pentacarbonyl.
  • CEP carbonyl iron powder
  • Various types of CEP are known to those skilled in the art.
  • reduced carbonyl iron powders can also be used. Such powders are less abrasive and are mechanically softer.
  • surface treated types are derived in a variety of ways. The most commonly used carbonyl iron powders are silicate or phosphate coated, but other modifications are available.
  • the dispersed carbonyl iron powder particles preferably have an average diameter of between 1 and 30 ⁇ m.
  • all types of carbonyl iron powder are suitable for the invention. The exact selection depends on the conditions of use for the magnetorheological formulation according to the invention.
  • the magnetisable particles are preferably contained in an amount of between 50% by weight and 90% by weight, particularly preferably between 70% by weight and 88% by weight, based on the total weight of the magnetorheological formulation.
  • the magnetorheological formulation contains at least one additive in addition to the ionic liquid.
  • the additive is preferably selected from the group consisting of thixotropic agents, viscosity modifiers, thickeners, dispersants, surface-active additives, antioxidants, lubricants and corrosion inhibitors.
  • Viscosity modifiers may be ionic liquid-soluble solvents or polymeric additives that alter the viscosity of the formulation. Suitable are e.g. polar solvents such as water, acetone, acetonitrile, low molecular weight alcohols, amines, amides, DMF, DMSO, or polymeric additives such.
  • polar solvents such as water, acetone, acetonitrile, low molecular weight alcohols, amines, amides, DMF, DMSO, or polymeric additives such.
  • the magnetorheological formulation according to the invention contains additives serving as a viscosity modifier, they are preferably present in a concentration of from 0.01 to 49% by weight, more preferably from 0.01 to 30% by weight, in particular from 0.05 to 10% by weight. %, in each case based on the total weight of ionic liquid and additives.
  • a thixotropic agent is an additive that builds a yield point and thus counteracts sedimentation of the magnetizable particles in the liquid contained in the magnetorheological formulation.
  • the magnetorheological formulation according to the invention may contain, for example, at least one thixotropic agent selected from the group consisting of natural and synthetic phyllosilicates of the smectite group (optionally hydrophobically modified phyllosilicates, for example of the montmorillonite type, as known from US Pat WO 01/03150 A1 known), silica gel or (amorphous) disperse silica (as US 5,667,715 known), fibrous Silicates (eg, micronized sepiolites and attapulgites), carbon particles (such as US 5,354,488 known), and polyureas (as out DE 196 54 461 A1 known) is selected.
  • thixotropic agents based on polymeric carbohydrates can be used, such as xanthan galactomannan
  • Examples of usable phyllosilicates are bentonite, montmorillonite, hectorite or synthetic phyllosilicates, such as Laponite® from Rockwood Additives Ltd. and their hydrophobically modified variants. Since the polarity of the liquid contained in the magnetorheological formulation is very high due to the nature of the ionic liquid, it is possible, for example, to use simple sheet silicate thickeners which bring about a reduced sedimentation of the magnetizable particles. The use of hydrophobically modified and therefore hydrophobic base oils such as poly- ⁇ -olefins and silicones adapted phyllosilicates is therefore possible, but not essential.
  • the magnetorheological formulation according to the invention contains additives which serve as thixotropic agents, these are preferably present in a concentration of 0.01 to 10% by weight, more preferably of 0.01 to 5% by weight, in particular of 0.05 to 1% by weight .-%, each based on the magnetorheological formulation included.
  • a dispersant is an additive which improves the redispersibility of the magnetizable particles in the liquid contained in the magnetorheological formulation after its sedimentation and prevents their agglomeration. Due to the polar character of ionic liquids dispersing agent can be dispensed with in the dispersion of magnetizable particles having a hydrophilic surface, for example of iron particles, in the liquid of a magnetorheological formulation according to the invention. In this case, chemical or physical changes in the magnetorheological formulation, which occur, for example, after long-term or continuous stress and due to the dispersant, do not take place.
  • polymeric dispersants such as polysaccharides, polyacrylates, polyesters, particularly polyhydroxy alkyd resins, long-chain alkoxylates continue polyalkylene oxides such as Pluronic ® from BASF AG, in which it comes also in the inventive magnetorheological formulation dispersants Polyethylene oxide-polypropylene oxide-polyethylene oxide block copolymers and polypropylene oxide-polyethylene oxide-polyproylene oxide block copolymers.
  • Possible dispersants are furthermore anionic, cationic, amphoteric and nonionic surfactants, which are known to the person skilled in the art and need not be mentioned in detail.
  • nonionic surfactants called its sugar surfactants and alcohol alkoxylates
  • anionic surfactants anions of carboxylic acids for example oleates and stearates
  • alkyl sulfates alkyl ether sulfates
  • alkyl phosphates alkyl ether phosphates and alkyl sulfonates
  • amphoteric or zwitterionic surfactants may be mentioned the alkylamine oxides.
  • the magnetorheological formulation according to the invention comprises dispersant-containing additives, these are preferably present in a concentration of from 0.01 to 5% by weight, particularly preferably from 0.05 to 1% by weight, based in each case on the magnetorheological formulation, contain.
  • the magnetorheological formulation of the present invention may optionally contain other additives, for example, lubricants such as Teflon powder, molybdenum sulfite or graphite powder, corrosion inhibitors, anti-wear additives and antioxidants.
  • lubricants such as Teflon powder, molybdenum sulfite or graphite powder, corrosion inhibitors, anti-wear additives and antioxidants.
  • the ionic liquid contained in the magnetorheological formulation at 25 ° C has a kinematic viscosity of ⁇ 5000 mPas, preferably ⁇ 1000 mPas, particularly preferably ⁇ 200 mPas (preferably measured according to DIN 51562 or ISO 3105 with a Ubbelohde viscometer type 501 from Schott). Furthermore, the ionic liquid of the magnetorheological formulation preferably at -30 ° C has a viscosity ⁇ 20,000 mPas, more preferably ⁇ 10,000 mPas, most preferably ⁇ 2,000 mPas.
  • the present invention further provides a process for producing a magnetorheological formulation of the invention by dispersing the magnetizable particles in a liquid containing an ionic liquid containing anions and cations.
  • the preparation is carried out, for example, so that the ionic liquid is initially charged and optionally provided with additives. Before the ionic liquid is mixed with other components of the magnetorheological formulation, it can be heated to reduce its viscosity. To prepare the magnetorheological formulation, the magnetisable particles are dispersed in the liquid containing the ionic liquid. However, it is alternatively possible to stir the magnetizable particles in the ionic liquid and only then add additives. The homogenization of the magnetorheological formulation is carried out, for example, with the aid of a suitable stirrer. Optionally, the resulting magnetorheological formulation is degassed under vacuum.
  • Another object of the present invention is the use of the magnetorheological formulation according to the invention for applications in controllable devices such as dampers, clutches, brakes and other devices, in particular haptic devices, crash absorbers, steer-by-wire steering systems, gear and brake-by-wire Systems, gaskets, restraints, prostheses, fitness equipment or bearings.
  • controllable devices such as dampers, clutches, brakes and other devices, in particular haptic devices, crash absorbers, steer-by-wire steering systems, gear and brake-by-wire Systems, gaskets, restraints, prostheses, fitness equipment or bearings.
  • Example 1 Magnetorheological formulation consisting of 19.5% by weight of EMIM EtSO4 (1-ethyl-3-methylimidazolium ethylsulfate), 0.5% by weight of phyllosilicate (Laponit® RDS from Rockwood Additives Ltd) as thixotropic agent and 80% by weight of carbonyl iron powder SQ from BASF AG as magnetizable particles.
  • EMIM EtSO4 (1-ethyl-3-methylimidazolium ethylsulfate
  • phyllosilicate Laponit® RDS from Rockwood Additives Ltd
  • carbonyl iron powder SQ from BASF AG
  • Example 2 Magnetorheological formulation consisting of 22.34% by weight of 1-ethyl-3-methylimidazolium thiocyanate, 0.66% by weight of Laponite® RDS sheet silicate from Rockwood Additives Ltd as thixotropic agent and 77% by weight of carbonyl iron powder having a mean particle diameter of 4 ⁇ m as magnetizable particles.
  • Example 3 23% by weight of 1-ethyl-3-methylimidazolium thiocyanate and 77% by weight of carbonyl iron powder type ON from BASF AG as magnetisable particles.
  • Comparative example 23% by weight of poly- ⁇ -olefin Durasyn® DS 192 from BASF AG and 77% by weight of carbonyl iron powder Type ON from BASF AG.
  • Table 1 contains the shear stresses ⁇ of the magnetorheological formulations at different temperatures (-30 ° C and 25 ° C) and shear rates (10 s -1 and 100 s -1 ) without magnetic field and at 25 ° C and 1 s -1 with magnetic field ( magnetic flux density 0.7 T).
  • the rheological characterization of the formulation with magnetic field is carried out in a commercial rheometer Physica MCR501 Anton Paar GmbH, equipped with a magnetic measuring cell MRD 180/1 T, also Anton Paar GmbH.
  • the measurements are carried out in a plate-and-plate arrangement with the standard supplied rotor with 20 mm diameter, the plate distance is 0.3 mm.
  • the calibration of the magnetic measuring cell with sample to determine the magnetic flux density is carried out with a gaussmeter from FW Bell (Model 9500, probe FW Bell 1X). After installation of the sample, a complete demagnetization of the measuring cell takes place.
  • the sample is pre-calibrated for 20 s before each measurement with a shear rate of 10 s -1 , followed by a rest period of 10 s.
  • different shear rates are approached (eg 0.1, 1, 10, 100 s -1 ).
  • the measured value is taken.
  • the specified shear stresses are calculated assuming a Newtonian liquid.
  • the rheological characterization of the formulation without magnetic field is carried out in a cone-plate geometry with 40 mm diameter and a cone angle of 2 (rheometer RheoStress 150 from Thermo Haake).
  • the measuring mode is shear-stress controlled, steps in the shear stress are started for a period of 1 s (typical shear stress ranges are between 0.05 and 2500 Pa) and a flow curve is created. From this, the shear stress associated with the shear rates 10 and 100 s -1 is read off.
  • Table 2 gives information on flow behavior at -40 ° C, for redispersibility, for redispersibility after 28 days and for oil separation.
  • the magnetorheological formulation is placed in a screw-on graduated test tube and read at 20 ° C, the oil separation percentage after 28 days.
  • base fluid Weight loss Am Rating for use at high temperatures i) poly- ⁇ -olefin (Durasyn 162) - 5.3% (30 ° C to 250 ° C) not suitable ii) Silicone oil (Wacker DM5) - 2.0% (30 ° C to 250 ° C) not suitable iii) ionic liquid: 1-ethyl-3-methyl-imidazolium ethylsulfate - 0.9% (30 ° C to 250 ° C) suitable
  • Second comparative experiment 18.67% by weight of poly- ⁇ -olefin (dimer of dodecane) and 80% by weight of carbonyl iron powder type ON from BASF AG and 0.66% by weight of dispersant Borchi Gen BG 911 (Borchers GmbH ) and 0.67 wt.% phyllosilicate Bentone SD3.

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Abstract

L'invention concerne une formulation magnétorhéologique contenant un liquide ionique à base d'anions et de cations, des particules magnétisables dispersées présentant un diamètre moyen compris entre 0,1 et 500 μm et éventuellement des additifs.

Claims (7)

  1. Formulation magnéto-rhéologique, contenant :
    - un liquide ionique contenant des anions et des cations,
    - des particules magnétisables dispersées d'un diamètre moyen compris entre 0,1 et 500 µm, et
    - éventuellement des additifs,
    caractérisée en ce que le liquide ionique est choisi parmi le méthylsulfate de 1-butyl-3-méthylimidazolium, l'éthylsulfate de 1-éthyl-3-méthylimidazolium, le thiocyanate de 1-éthyl-3-méthylimidazolium, le thiocyanate de 1-butyl-3-méthylimidazolium, l'acétate de 1-éthyl-3-méthylimidazolium, l'acétate de 1-butyl-3-méthylimidazolium, l'éthylsulfate de 1-éthyl-3-méthylpyridinium, le dicyanamide de 1-éthyl-3-méthylimidazolium, le tétrafluoroborate de 1-butyl-3-méthylimidazolium, le tétrafluoroborate de 1-hexyl-3-méthylimidazolium, le tétrafluoroborate de 1-méthyl-3-octylimidazolium, l'hexafluorophosphate de 1-méthyl-3-octylimidazolium, l'hexafluorophosphate de 1-éthyl-3-méthylimidazolium, l'hexafluorophosphate de 1-hexyl-3-méthylimidazolium, le bis(trzfluorométhylsulfonyl)imide de méthyltrioctylammonium et le 2(2-méthoxyéthoxy)éthylsulfate de 1-éthyl-3-méthylimidazolium.
  2. Formulation magnéto-rhéologique selon la revendication 1, caractérisée en ce que la formulation magnéto-rhéologique contient au moins un additif choisi dans le groupe constitué par les agents thixotropiques, les modificateurs de viscosité, les épaississants, les agents de dispersion, les additifs tensioactifs, les antioxydants, les agents anti-adhérents/lubrifiants et les agents anticorrosion.
  3. Formulation magnéto-rhéologique selon l'une quelconque des revendications 1 ou 2, caractérisée en ce que le rapport entre la proportion en poids du liquide ionique et la proportion en poids des additifs, à chaque fois par rapport au poids total de la formulation magnéto-rhéologique, est supérieur à 1.
  4. Formulation magnéto-rhéologique selon l'une quelconque des revendications 1 à 3, caractérisée par des particules magnétisables choisies dans le groupe constitué par les particules contenant du fer, les particules contenant du nickel et les particules contenant du cobalt.
  5. Formulation magnéto-rhéologique selon la revendication 4, caractérisée en ce que des particules de carbonyle de fer d'un diamètre moyen compris entre 1 et 30 µm sont contenues en tant que particules magnétisables.
  6. Procédé de fabrication d'une formulation magnéto-rhéologique selon l'une quelconque des revendications 1 à 5, caractérisé par la dispersion des particules magnétisables dans un liquide, qui contient un liquide ionique contenant des anions et des cations.
  7. Utilisation d'une formulation magnéto-rhéologique selon l'une quelconque des revendications 1 à 5 dans un dispositif ajustable choisi dans le groupe constitué par les amortisseurs, les raccords, les freins et autres appareils, tels que les appareils de fitness, les appareils haptiques, les systèmes de retenue, les absorbeurs d'impact, les systèmes de conduite « Steer-by-Wire », les systèmes « Gear- et Brake-by-Wire », les joints, les prothèses et les paliers.
EP07820293A 2006-09-22 2007-09-18 Formulation magnétorhéologique Not-in-force EP2067147B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07820293A EP2067147B1 (fr) 2006-09-22 2007-09-18 Formulation magnétorhéologique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US82666806P 2006-09-22 2006-09-22
EP06121112 2006-09-22
EP07820293A EP2067147B1 (fr) 2006-09-22 2007-09-18 Formulation magnétorhéologique
PCT/EP2007/059830 WO2008034820A1 (fr) 2006-09-22 2007-09-18 Formulation magnétorhéologique

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JP5222296B2 (ja) 2013-06-26
KR20090058024A (ko) 2009-06-08
JP2010504635A (ja) 2010-02-12
WO2008034820A1 (fr) 2008-03-27
US8486292B2 (en) 2013-07-16
EP2067147A1 (fr) 2009-06-10
KR101373387B1 (ko) 2014-03-13
US20090289214A1 (en) 2009-11-26

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