ETHYLENE-ACRYLIC RUBBER-BASED MAGNETO-RHEOLOGICAL ELASTOMER HAVING EXCELLENT LOW-TEMPERATURE FLEXIBILITY, HEAT RESISTANCE, OIL RESISTANCE, WEATHER RESISTANCE, DAMPING PROPERTY, AND MAGNETO-RHEOLOGICAL EFFECT, AND METHOD OF PRODUCING SAME

Hereinafter, in the embodiment of the present invention with reference to the attached drawing one preferred detail of the SFC substrate.

The present invention according to the magnetic type arm elastic body for schematic [...] bath device number [also 1], [2 also] number bath device of actual photo magnetic type arm elastic body are disclosed.

The present invention according to magnetic type arm elastic body number bath device is performed as well as the magnetic field curing reaction to pressing means, heating means, magnetic field applying means each other grafting over one device.

The present invention according to magnetic type arm elastic body number for high pressure liquid coolant, first mold (3) inside the magnetically responsive particles is mixed ethylene - acrylic rubber composition sample (4) into the next, in the arrow direction electromagnetic coil (2) by magnetic field as well as the hydraulic cylinder (1) and a heater (6) heat to the curing reaction by respective pressure rubber composition inducing substrate.

The present invention according to magnetic type arm elastic body number bath device includes a heater (6) temperature range of 250 °C, pressure 350 kg/cm2 (0 - 5000 psi) can be added to the designed to.

In the embodiment of the present invention according to one said mold (3) 165 °C 20 minutes in a heating and curing rubber composition embodiment, after completion of the curing mold (3) to obtain a cured product of the magnetic type arm elastic body main body from ethylene - acrylic rubber.

The cured magnetic type arm elastic body [1 also] of magnetic fields in the arrow direction by magnetically responsive particles to improve the orientation of windmill having high modulus CP1 to be coated.

[Table 1] of the present invention composition below one in the embodiment according to magnetic type arm elastic body such as disclosed.

[Table 1] said magnetically responsive particles in a number of composition ratio (CIP) 100 parts by weight of ethylene - acrylic rubber (AEM) [...] compounding additional weight which as been indicated, magnetically responsive particles (CIP) ethylene - acrylic rubber (AEM) carbon black (CB) composition ratio on the volume of the volume for a summed been indicated as % are disclosed.

The present invention refers to low temperature flexibility, heat resistance, oil resistance, weather resistance, such as high pressure liquid coolant type arm elastic body [table 1] number variable modulus and damping quality with an ethylene - acrylic rubber (AEM) for on carbon black (Carbon black, CB), a polyamine-based vulcanizing number (PA-a curative), processing aid number (processing aid), stearic acid (stearic acid, SA), guanadine-based [...] rubber mixing number number (di-a ortho-a tolyl guanidine: DOTG) and high pressure liquid coolant and anti-inflammatory effects, proper amount of magnetically responsive particle said rubber composition mixing substrate.

Magnetically responsive particles include magnetic field is applied to the orientation is derived modulus can impart variability as, iron physical, chemically are grindedSilica-coated carbonylated iron powder (carbonyl iron powder, CIP) can be used.

One of the present invention in the embodiment according to magnetically responsive particles having an average diameter of particles ([...]) 4 - 6 micro m opening shape can be used.

In addition magnetically responsive particles mixed loading if too little number inorganic filler rubber composition so that the elastic body has been added excess prestage modulus decreases sufficiently alloy has mechanical properties, such as rigidity is constant size for vehicle requires optimum physical properties and modulus variance cannot be inserted article number applied considers both the filling quantity of selecting accomplishing.

In the embodiment according to magnetically responsive particles of the present invention ethylene acrylic rubber (AEM)- one electrical charge on carbon black (CB) 10 - 40 vol % with respect to the summed volume of are calculated substrate.

[Table 1] said ethylene - acrylic rubber (AEM) matrix in elastic body is disclosed includes a low temperature flexibility, heat resistance, oil resistance, weather resistance and excellent damping characteristics acrylic synthetic rubber, ethylene acrylic rubber (AEM)- using the elastic body of the matrix therefore low temperature flexibility, heat resistance, oil resistance, weather resistance, excellent magnetic damping quality high pressure liquid coolant type arm elastic body in order to number.

Carbon black (CB) ethylene - acrylic rubber reinforcing fillers number ethylene - acrylic rubber 100 parts by weight of rubber composition as taking into account the mechanical properties adding 30 parts by weight of the preferred.

A polyamine-based vulcanizing number acrylic synthetic rubber composition useful in vulcanization (PA-a curative) is vulcanization number as hexamethylenediamine carbamate (hexamethylene diamine carbamate: hanger Diak No. 1) And can be are used, acrylic synthetic rubber composition kneading, extrusion of a machining operation for processing aid are used hereinafter for number (processing aid: hanger Vamfrc VAN) values can be, vulcanization at the time of curing as a stearic acid (SA) is used to activate the main activation number can be disclosed.

These polyamine-based vulcanizing number (PA-a curative), processing aid number (processing aid), ethylene - acrylic rubber 100 parts by weight of stearic acid (SA) 1 respectively. 5 Parts by weight of the addition preferably.

(Di-a ortho-a tolyl guanidine: DOTG) is comparatively gentle [...] guanadine-based [...] number act upon large number (characteristics) and hardness ([...]) rigid article having properties such that the ethylene - acrylic rubber 100 parts by weight of the number [...][...] number preferably 4 parts by weight of the addition.

In the embodiment of the present invention according to the present invention according to one magnetic type arm elastic body to said magnetic type arm elastic body is put in the device number bath uncured ([...]) composition as the filled magnetically responsive particles by improving the orientation of variable modulus number having elastic high pressure liquid coolant therein.

[Experiment example 1]

[Table 1] number bath device 165 °C x 20 minutes in said magnetic type arm elastic body composition magnetic type arm elastic body vulcanization condition cured magnetic type arm elastic body tensile properties [also 3], [4 also] have shown the graph.

Tensile strength (tensile strength) [also 3], [4 also] exhibit elongation (elongation) is respectively, graph is formed in combination with magnetically responsive particles inducing an orientation of the magnetic type in arm elastic body (CIP)◆indication is not isotropic magnetic type arm elastic body (isotropic a-MRE: i-a MRE), i.e. rubber matrix upon curing reactive particles uniformly dispersed magnetic field the magnetic thread is isotropic magnetic type arm elastic body (CIP) components, accordance with magnetically responsive particles (CIP) matrix display■inducing an orientation of the magnetic field upon curing anisotropic magnetic type arm elastic body (anisotropic-a MRE: a-a MRE) big.

Results of this test, magnetically responsive particles (CIP) is incremented at a mixing amount (charge) in 10 vol % 40 vol % by anisotropic or isotropic magnetic type arm elastic body (i-a MRE) type arm elastic body (a non-MRE) reducing both tensile strength and elongation has been confirmed. The magnetic reactive particles (CIP) (charge) by mixing amount increased in combination with magnetically responsive particles and matrix rubber with result because of lack of joined at prior to think with each other.

Anisotropic type arm elastic body (a non-MRE) of tensile strength and elongation is isotropically magnetic type arm elastic body (i-a MRE) by removing the magnetically responsive particles (CIP) as compared to a relatively small thickness direction of orientation direction while the tensile specimen, the magnetically responsive particles (CIP) tensile specimen because of a tensile direction of vertical alignment direction is considered to substrate.

The magnetically responsive particles (CIP) orientation of the magnetic type arm elastic body excellent tensile strength that the increase can be reduced.

[Table 2] is below [also 3], [4 also] tension characteristic values recorded in the tables are disclosed.

Generally, accumulation of energy in, according to an energy supply without loss (elastic) is referred to as elastic insulation material, thermal energy form part of the energy loss can be referred to as a medicated viscous (viscous) personality.

The two resins are rubber ideal material properties of these widened corresponding to any intermediate character (viscoelasticity) suitable for a viscoelastic behavior.

(Viscoelasticity) material when applied to the constant input viscoelastic behavior in hook form elastic response characteristics such as laws but simply expressed, when in the form of signed varies over time input (sine) curve of phase difference is equal to the response of the stress.

Now representing the deformation stress amplitude γ linear in viscoelasticity body linear relationship₀ , Modified to frequency ω / 2 π=γ γ (t)₀ There is constant stress σ cos ω t (t is time)₀ , Δ stress σ=σ (t) to phase difference₀ Cos (ω t + δ) that obtained when, δ and σ₀ / Γ₀ Ω=|G|is a function of both the G ' (ω)=|G|cos δ, G " σ (ω)=|G|sin δ (t) receive a next [type 1] are such as both sides of it.

Σ=γ (t)₀ {G ' cos ω t - G (ω) " (ω) sin ω t} [type 1] - - - - - - - - - - - - - - - - - - - - - - - - -

[Type 1] of said right arm such as number 1 number 2 terms are phase by phase has greater than prior 90° anti deformed etc.. Thus G ' dynamic modulus (elastic modulus: shear storage modulus) and (ω) it, G " (ω) is the unit volume of 1 W W=π γ heat loss between period₀² G " (ω) suitable for a given by the loss modulus (loss factor: loss modulus).

[Experiment example 2]

[Also 5] to [8 also] tester (dynamic mechanical analyzer: DMA) (MRE) using rubber dynamic properties of the dynamic properties of the graph evaluating magnetic type arm elastic body are disclosed.

The magnetic type arm elastic body (MRE) [table 1] test used in magnetic type arm elastic body composition number bath device 165 °C x 20 minutes in said magnetic type arm elastic body is vulcanization condition cured are disclosed.

In addition the test (DMA) is used in place of an old tester by utilizing a magnetic field to the dynamic characteristic tester (MRE) dynamic properties of the contact hole number it became work estimate herself while type arm elastic body are disclosed.

(DMA) said present invention according to dynamic tester (MRE) can be evaluation item as magnetic type arm elastic body for assessing viscoelastic stress (elastic modulus: storage modulus) and elasticity of a predictable magnetic type arm elastic body (MRE), when a change in magnetic field to a desired line (MRE) type arm elastic body can be locating magnetic type arm effect (MR effect).

I.e., MR effect (%)={(G '₁ - G '₀ )/G '₀ } [Type 2] x 100 - - - - - - - - - - - - - - - - - - - -

Wherein G '₀ Dynamic modulus (elastic modulus) when the dynamic magnetic field during the test thread and, G '₁ To dynamic modulus (elastic modulus) when magnetic field are disclosed.

[Also 5], [6 also] (DMA) is measured as the present invention according to dynamic tester (MRE) dynamic modulus (elastic modulus) indicating magnetic type arm elastic body, magnetic reactive particles uniformly dispersed (CIP) [also 5] is isotropic magnetic type arm elastic body (i-a MRE) test value, the magnetically responsive particles (CIP) [6 also] oriented anisotropic constant (a non-MRE) test value etc. type arm elastic body respectively.

[Also 5] and [6 also]◆indication chart of anisotropic or isotropic magnetic type arm elastic body (i-a MRE) type arm elastic body (a non-MRE) dynamic modulus (elastic modulus) imparting a magnetic field being not, anisotropic or isotropic magnetic type arm elastic body■indication (i-a MRE) dynamic modulus (elastic modulus) when imparting a magnetic field (a non-MRE) type arm elastic body by a goniophotometer.

[Also 5] and [6 also] of a graph of residual, magnetic type arm elastic body (MRE) is isotropic (i-a MRE) or anisotropic (a non-MRE) magnetic reactive particles (CIP) 10, 20, 30, 40 vol % regardless of applied magnetic field by the dynamic modulus (elastic modulus) is updated by aspect or exhibit increased, magnetic field (CIP) to lower than the first magnetic reactive dynamic modulus (elastic modulus) that increases with reducing aspect and viscoelasticity.

It is isotropic magnetic type arm elastic body (i-a MRE) than these anisotropic type arm elastic body (a non-MRE) more severely appeared.

The present invention according to the magnetic type arm elastic body (MRE) dynamic characteristics test is isotropic (i-a MRE) or anisotropic (a non-MRE) magnetic field with an regardless to stress (elastic modulus) is not thread when the river test device has an, if the magnetically responsive particles dispersed within the rubber matrix applied magnetic field (CIP) are applied magnetic field response dynamic modulus (elastic modulus) of the matrix be oriented direction due to increasing but, magnetic field lines do not thread if dispersed magnetically responsive particles (CIP) viscoelasticity body rubber matrix are large because the viscous element acting is considered to substrate.

In addition anisotropic type arm elastic body such aspects (a non-MRE) appears to be more harshly in the morning fair number type arm elastic body (CIP) rubber matrix magnetically responsive particles are anisotropic magnetic field direction such as chain (chain a-like structure) oriented to impart shape magnetic field is considered to exhibit high modulus than the substrate.

[Also 7], [8 also] dynamic tester (DMA) measured as loss of modulus exhibit magnetic type arm elastic body (MRE) (loss factor, loss modulus), loss modulus (loss factor) (MRE) degree as the viscosity of the magnetic type arm elastic body, i.e. the damping characteristics of predictable disclosed.

The isotropic magnetic type arm elastic body [7 also] (i-a MRE) or anisotropic magnetic type arm elastic body (a non-MRE) imparting a magnetic field indicates a loss of modulus (loss factor) and not, the isotropic magnetic type arm elastic body [8 also] (i-a MRE) or anisotropic magnetic type arm elastic body (a non-MRE) of loss modulus (loss factor) when imparting a magnetic field indicates a disclosed.

In addition [also 7] and [8 also]◆indication magnetically responsive particles uniformly dispersed (CIP) chart of isotropic magnetic type arm elastic body (i-a MRE) is a, ■indication magnetically responsive particles (CIP) oriented anisotropic type arm elastic body respectively indicative of a certain direction (a-a MRE) etc..

[Also 7] and [8 also] of a graph of residual, magnetic type arm elastic body (MRE) is isotropic (i-a MRE) or anisotropic (a non-MRE) magnetic field (CIP) to lower than the first magnetic reactive particles regardless of 10, 20, 30, 40 vol % by loss modulus (loss factor) is updated by aspect or exhibit increased on a large scale, applied magnetic field magnetic reactive particles (CIP) with the increase of loss modulus (loss factor) slightly decreasing aspect and viscoelasticity.

The present invention according to the magnetic type arm elastic body (MRE) dynamic characteristics test is isotropic (i-a MRE) or anisotropic (a non-MRE) magnetic field lines do not regardless if thread, magnetically responsive particles (CIP) is updated by 10, 20, 30, 40 vol % by loss modulus (loss factor) is remarkably increased dynamic characteristics as described front and large rubber particles are dispersed in a matrix (CIP) viscoelasticity body is installed in the larger viscous element magnetically responsive thought with each other.

In addition to magnetic field when, magnetically responsive particles (CIP) does not decrease with the increase of loss modulus (loss factor) front and dynamic characteristics as described magnetic field to impart rubber is dispersed in a matrix (CIP) magnetically responsive particles are applied magnetic field response dynamic modulus (elastic modulus) be oriented direction is increased due to the matrix, mounted as shown by the reduction of loss modulus (loss factor) because are considered.

[9 Also] (CIP) content of magnetic reactive particles according to isotropic magnetic type arm elastic body (i-a MRE) (a-a MRE) type arm elastic body by the anisotropic magnetic type arm effect (MR effect) contains as graph comparing [also 5], said dynamic modulus (elastic modulus) measured at a [6 also] [type 2] of G '₀ , G '₁ B is obtained by respectively are disclosed.

[9 Also] pillar is magnetically responsive particles uniformly dispersed (CIP) chart of black is isotropic magnetic type arm elastic body (i-a MRE) represents magnetic type arm effect (MR effect), gray posts are magnetically responsive particles (CIP) type arm elastic body being oriented in a magnetic type arm effect exhibits anisotropic (a non-MRE) (MR effect).

[9 Also] of a graph of residual, magnetic type arm elastic body (MRE) is isotropic (i-a MRE) or anisotropic (a non-MRE) (CIP) is regardless of magnetically responsive particles updated by 10, 20, 30, 40 vol % by magnetic type arm effect (MR effect) is shown magnetically responsive particles according to accordingly increase the aspect (CIP) magnetic type arm effect can be identifying (MR effect).

In addition magnetically responsive particles all content is isotropic magnetic type arm elastic body (CIP) in anisotropic type arm elastic body (a non-MRE) (i-a MRE) is greater than the anisotropic magnetic type arm effect (MR effect) represented a type arm elastic body (a non-MRE) is isotropic magnetic type arm elastic body (i-a MRE) is greater than the magnetic type arm effect can be confirmed by having (MR effect).

Magnetic type arm effect (MR effect) all external vibrations absorbing regions which may increase in consideration, the present invention according to this magnetic type arm elastic body (MRE) dianhydride major properties is also disclosed.

Magnetically responsive particles (CIP) the orientation of the magnetic type arm elastic body (MRE) cross-section can be identified by electron photographed, [also 10] to [15 also] content of isotropic magnetic type arm elastic body (CIP) according to magnetic reactive particles (i-a MRE) by the anisotropic type arm elastic body (a non-MRE) cross-section taken electron are disclosed.

[10 Also], [also 12] (CIP) is uniformly dispersed magnetic reactive particles (i-a MRE) isotropic magnetic type arm elastic body for driving the electron, the magnetically responsive particles (CIP) 10 vol % [10 also], [12 also] (CIP) exhibits magnetic reactive particles when combined 40 vol %.

[11 Also], the magnetically responsive particles (CIP) [13 also] oriented anisotropic constant for driving the electron type arm elastic body (a non-MRE), the magnetically responsive particles (CIP) 10 vol % [11 also], when the magnetically responsive particles in combination exhibits 40 vol % [13 also] (CIP).

[11 Also], [also 13] a user opens a magnetically responsive particles (CIP) orientation of the tridimensional shape chain (chain a-like structure) and well to that as shown in, magnetically responsive particles (CIP) 10 vol % relative to the magnetically responsive particles in combination [11 also] [13 also] 40 vol % (CIP) in combination with chains of the tridimensional shape (chain a-like structure) is better development can be cylindrical.

[Also 14], [15 also] (CIP) orientation magnetic reactive liquid to more clearly a self-type arm elastic body (MRE) glass transition temperature (glass transition temperature) using nitrogen to the center of the gear for a homepage for rupture grudge hereinafter after by freezing, 10 vol % [14 also] (CIP) being oriented in a magnetic reactive particles for anisotropic type arm elastic body (a non-MRE) and, [15 also] 40 vol % (CIP) oriented anisotropic magnetic reactive particles (a non-MRE) type arm elastic body being provided magnetically responsive particles (CIP) for storing magnetically responsive particles increases as the orientation of the cylindrical coupling (CIP) can be.

[Experiment example 3]

[16 Also] and [17 also] manufacturing method and magnetically responsive particles of the anisotropic type arm elastic body (a non-MRE) (CIP) type arm elastic body (a non-MRE) graph according to content of anisotropic tensile physical properties are disclosed.

The test type arm elastic body [table 1] said anisotropic magnetic type arm elastic body composition (a-a MRE) is over.

The tensile strength of the anisotropic type arm elastic body (a non-MRE) [also 16] (tensile strength), and elongation (elongation) each representing the [17 also], [16 also] and [17 also] 1 (one step) by◆indication step chart of anisotropic properties of type arm elastic body manufacturing method (a-a MRE) represents number produced therewith, ■indication step 2 (two step) exhibits anisotropic properties of type arm elastic body (a non-MRE) by number prepared by the manufacturing method.

Step 1 (one step) manufacturing method wherein a magnetic field 1. 5 Tesla (Tesla) in a discharge type arm elastic body 20 to a hardening temperature of 165 °C anisotropic method and a number (a non-MRE) a bath curing minutes, step 2 (two step) (i) in the manufacturing method 1 100 °C compared herein first. 5 Tesla (Tesla) by applying magnetic fields magnetically responsive particles of orientation of the (CIP) after, application of magnetic field exists in 20 minutes (ii) 165 °C temperature curing and curing the anisotropic type arm elastic body (a non-MRE) number in a bath method are disclosed.

2 Manufacturing method (two step) in step 1 is a rubber matrix cure 100 °C temperature setting step to lower the viscosity of the matrix by the prior (CIP) smoothly dispersed magnetically responsive particles to induce orientation of the sins.

[Table 3] under the [also 16], [17 also] to organize his tensile physical property value are disclosed.

[Table 3] a user opens a anisotropic depending on tensile properties (a non-MRE) type arm elastic body manufacturing method can be know.

I.e., step 1 (one step) by anisotropic prepared by the number type arm elastic body manufacturing method of tensile strength and elongation is 2 (two step) manufacturing method steps (a-a MRE) by anisotropic prepared by the number type arm elastic body is lower than the value (a-a MRE) indicates a disclosed.

[Experiment example 1] as described in front of and (CIP) is to increase the orientation of the magnetic type arm elastic body excellent tensile properties magnetically responsive particles, relative tensile properties (one step) number by 1 step fall type arm elastic body manufacturing method (a-a MRE) is 2 (two step) by anisotropic prepared by the manufacturing method step number (a non-MRE) type arm elastic body (CIP) compared to magnetically responsive particles prepared by the anisotropic orientation of the can be fathom till will be better.

Magnetically responsive particles (CIP) the orientation of the magnetic type arm elastic body (MRE) cross-section electron microscope shot can be identified, the step number by 1 (one step) [18 also] manufacturing method of electron microscope photograph cross-type arm elastic body (a non-MRE) and anisotropic produced therewith, [19 also] 2 (two step) manufacturing method includes a step of electron microscope photograph cross-type arm elastic body by anisotropic prepared by the number (a non-MRE) 2000.

[18 Also], [also 19] as can recognize the cross-section of electron microscope photograph through, step 1 (one step) by anisotropic prepared by the number (a non-MRE) type arm elastic body manufacturing method is possible particularly when the engine timed relative to chain tridimensional shape (chain a-like structure), 2 (two step) (a-a MRE) type arm elastic body manufacturing method step by anisotropic prepared by the number chain is not 1 (one step) and left and right wall is strengthened tridimensional shape (chain a-like structure) manufacturing method 2 (two step) compared to magnetically responsive particle manufacturing method step is step (CIP) orientation can be know relatively excellent.

[Also 20], [21 also] according the dynamic modulus (elastic modulus) (a-a MRE) anisotropic prepared by the number said manufacturing method represents a type arm elastic body are disclosed.

[20 Also] dynamic modulus (elastic modulus) magnetic field during the test is not impart self-reactive particles (CIP) according and indicates a content of, dynamic modulus (elastic modulus) [21 also] imparting a magnetic field when a blocking unit content of self-reactive etc. (CIP).

And [also 20], [21 also]◆indication (one step) chart of manufacturing method 1 step by a dynamic modulus (elastic modulus) anisotropic prepared by the number type arm elastic body (a non-MRE), ■indication number 2 (two step) manufacturing method step by dynamic modulus (elastic modulus) prepared by the anisotropic type arm elastic body (a non-MRE) indicates a disclosed.

[Also 20] and [21 also] of a graph of residual, anisotropic dynamic modulus (elastic modulus) is (a-a MRE) type arm elastic body manufacturing method according to wavelength plate can be know.

In particular dynamic modulus (elastic modulus) when a dynamic characteristic of the magnetic field applied during the test indicating the [21 also], step number by 1 (one step) manufacturing method (a-a MRE) type arm elastic body (CIP) is prepared by the anisotropic magnetic reactive dynamic modulus (elastic modulus) updated by 10, 20, 30, 40 vol % by the aspect or exhibit increased, step number by 2 (two step) manufacturing method (a-a MRE) type arm elastic body (CIP) magnetic reactive particles prepared by the anisotropic stress increases with an (elastic modulus) is rather slightly reduced or do not change aspect and viscoelasticity.

The dynamic modulus (elastic modulus) is applied magnetic field when different manufacturing method according aspects (CIP) it appears that only small part magnetically responsive particle orientation films are considered.

[22 Also] is by manufacturing method of anisotropic type arm elastic body (a non-MRE), magnetically responsive particles (CIP) according to magnetic type arm effect (MR effect) contains as graph comparing content of [20 also], said dynamic modulus (elastic modulus) of a measured at [21 also] [type 2] G '₀ , G '₁ B is obtained by respectively are disclosed.

[22 Also] manufacturing method (one step) number by 1 step chart of gray the posts are anisotropic type arm elastic body (a non-MRE) represents magnetic type arm effect (MR effect) produced therewith, number 2 (two step) manufacturing method step by black the posts are anisotropic (a non-MRE) type arm elastic body exhibits magnetic type arm effect (MR effect) produced therewith.

[22 Also] of a graph of residual, regardless of magnetically responsive particles is anisotropic (a non-MRE) type arm elastic body manufacturing method (CIP) is updated by 10, 20, 30, 40 vol % by magnetic type arm effect (MR effect) is shown magnetically responsive particles according to accordingly increase the aspect (CIP) magnetic type arm effect can be identifying (MR effect).

In addition 1 (one step) manufacturing method step by step number is 2 (two step) (a-a MRE) type arm elastic body by anisotropic prepared by the manufacturing method (a-a MRE) type arm elastic body is greater than the number prepared by the anisotropic magnetic type arm effect is also used for indicating (MR effect) can be.

The present invention refers to drawing a shown in the embodiment described with reference to but, this exemplary to avoid a person with skill in the art being equipped with a flawless if various deformation and equally to the other in the embodiment described in therefrom is enabling will understand.

The scope of protection of the present invention is defined by claim generated by the descriptive true will.