KR20170129441A - Ethylene-Acrylic Rubber based magneto-rheological elastomer having excellent low temperature flexibility, heat resistance, oil resistance, weather resistance, damping and MR effect, and the making method of the same - Google Patents
Ethylene-Acrylic Rubber based magneto-rheological elastomer having excellent low temperature flexibility, heat resistance, oil resistance, weather resistance, damping and MR effect, and the making method of the same Download PDFInfo
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Abstract
The present invention relates to a magnetorheological elastomer of ethylene-acrylic rubber excellent in low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect, and a method for producing the same. The magnetorheological elastomer of ethylene- 100 parts by weight of acrylic rubber (AEM); 30 parts by weight of carbon black (CB); 1.5 parts by weight of a polyamine-based vulcanizing agent (curative), a processing aid, and stearic acid; And 4 parts by weight of a guanidine vulcanization accelerator (DOTG), wherein 10 to 40 vol% of magnetic reactive particles are added to the total volume of the ethylene-acrylic rubber (AEM) and the carbon black (CB) Composition.
In addition, the magnetorheological elastomer of the ethylene-acrylic rubber according to the present invention has a one step manufacturing method of hardening the uncured composition of the magnetorheological elastomer at a curing temperature in a state of applying a magnetic field.
Description
The present invention relates to a magnetorheological elastomer of an ethylene-acrylic rubber excellent in low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect, and a method for producing the same. More specifically, the present invention relates to a magnetorheological elastomer having low temperature flexibility, heat resistance, oil resistance, An ethylene-acrylic rubber self-extinguishing agent having excellent low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect produced by applying an appropriate strength magnetic field to an elastomer composition containing an ethylene- And a method for producing the same.
In general, vibration is generated by various causes ranging from the vibration transmitted from the road surface to the vibration due to the engine rotation. In order to absorb these vibrations, a vibration-proof rubber component is usually used. The vibrations of the vehicle have various frequency ranges. On the other hand, conventional vibration damping rubbers for general automobiles use rubber or filler used as a matrix, and has a disadvantage in that it only absorbs vibrations generated by a frequency of a specific region band because it has a modulus.
Conventional vibration damping rubbers having such a fixed modulus can not effectively cancel the vibrations generated by various frequency bands, thereby failing to contribute to improving the performance and riding comfort of the vehicle. For example, vibration damping characteristics This good anti-vibration rubber can not converge the vibration generated in the high-frequency region band, which may cause the steering stability of the vehicle, the cornering and the ride comfort.
Therefore, there is a need for an anti-vibration rubber having a variable modulus that can efficiently control vibrations generated by various frequencies, and studies are underway.
In general, an elastic body having a variable modulus can be changed to a modulus suitable for a frequency characteristic of a vibration source, thereby realizing an optimum vibration-damping effect.
One of the elastomers having a variable modulus is a magneto-rheological elastomer (MRE) capable of inducing a modulus change by a magnetic field by adding a magnetic reactive particle to a rubber matrix.
Conventional vibration damping rubbers are made by filling a filler such as carbon black with various kinds of rubbers including butyl rubber having excellent damping characteristics, and by absorbing external physical energy, that is, vibration when the vibration is transferred to the elastic body, This method has the inherent modulus of the material due to the type of rubber used, the type / amount of filler, and the crosslinking density of the elastomer.
Such a fixed modulus is suitable for absorbing frequency oscillation in a specific region, but has a problem in that vibrations generated by frequencies other than the specific region can not be converged.
When the vibration transmitted to the vehicle can not be properly absorbed due to the fixed modulus of the conventional anti-vibration rubber, the durability, ride comfort, running performance and cornering performance of the vehicle parts are lowered.
Therefore, a magnetorheic elastomer having a natural rubber (NR) matrix has been developed (Patent Application No. 10-2010-0105993), but the low temperature flexibility, heat resistance, oil resistance, weather resistance and damping characteristics of the elastomer are inferior, , The rubber mixture is transferred to a pressure press to form a self-oriented elastomer, which changes the orientation of the self-oriented particles, resulting in insufficient performance as a self-lubricating elastomer, thus being used for vibration proofing that absorbs a wide range of frequency vibrations It was not enough for this.
An object of the present invention is to provide an ethylene-acrylic rubber excellent in low temperature flexibility, heat resistance, oil resistance, weather resistance and damping property, and an appropriate amount of self-reactive The present invention provides a magnetorheic elastomer of an ethylene-acrylic rubber having excellent low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect produced by applying an appropriate strength magnetic field to an elastomer composition containing particles.
Another object of the present invention is to provide a process for producing an ethylene-acrylic rubber magnetorheological elastomer having excellent low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect.
In order to solve the above-mentioned problems, the present invention provides a rubber composition comprising 30 parts by weight of carbon black (CB) relative to 100 parts by weight of an ethylene-acrylic rubber (AEM) 1.5 parts by weight of a polyamine-based vulcanizing agent (curative), a processing aid, and stearic acid; And 4 parts by weight of a guanidine vulcanization accelerator (DOTG), wherein 10 to 40 vol% of self-reactive particles are further added to the total volume of the ethylene-acrylic rubber (AEM) and the carbon black (CB) The present invention provides a magnetorheological elastomer of ethylene-acrylic rubber excellent in flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect.
As the self-reactive particles, carbonyl iron powder (CIP) is preferably used.
The self-reactive particles are spherical in shape and have an average diameter of 4 to 6 mu m.
The present invention also relates to a process for producing an ethylene-acrylic rubber magnetorheic elastomer characterized by having a one-step production method of curing an uncured composition of a magnetorheological elastomer at a curing temperature in a state of applying a magnetic field .
Here, the strength of the magnetic field applied to the uncured (uncured) composition of the ethylene-acrylic rubber magnetorheic elastomer is preferably 1.5 tesla.
The curing condition of the ethylene-acrylic rubber magnetorheic elastomer is preferably 165 ° C x 20 minutes.
The present invention relates to an elastomer composition comprising an ethylene-acrylic rubber excellent in low-temperature flexibility, heat resistance, oil resistance, weather resistance and damping property and an appropriate amount of self-reactive particles, and having low temperature flexibility, heat resistance, oil resistance, weatherability, And has the effect of providing a magnetorheological elastomer of an ethylene-acrylic rubber excellent in characteristics and magnetorheological effect.
Further, the present invention has an effect of providing a process for producing an ethylene-acrylic rubber magnetorheological elastomer excellent in low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect.
1 is a schematic view of an apparatus for manufacturing a magnetorheic elastomer according to the present invention.
2 is a photograph of an apparatus for manufacturing a magnetorheic elastomer according to the present invention.
3 is a graph showing the tensile strength of the magnetorheic elastomer according to the present invention.
4 is a graph showing elongation ratios of the magnetorheic elastomer according to the present invention.
5 is a graph showing the dynamic modulus of elasticity of an isotropic magnetorheic elastomer (i-MRE) measured with a dynamic characteristic tester (DMA).
6 is a graph showing the dynamic modulus of elasticity of anisotropic magnetorheic elastomer (a-MRE) measured with a dynamic characteristic tester (DMA).
7 is a graph showing the loss factor of the isotropic magnetocrystalline elastomer (i-MRE) and anisotropic magnetorheic elastomer (a-MRE) measured by a dynamic characteristic tester (DMA) without applying a magnetic field thereto.
8 is a graph showing a magnetic field as a loss factor of an isotropic magnetophoretic elastomer (i-MRE) and an anisotropic magnetophoric elastomer (a-MRE) measured with a dynamic characteristic tester (DMA).
9 is a graph comparing the magnetorheological effect (MR effect) of an isotropic magnetorheic elastomer (i-MRE) and an anisotropic magnetophoretic elastomer (a-MRE) by the content of self-reactive particles (CIP).
10 is an electron microscope sectional photograph of an isotropic magnetopule elastomer (i-MRE) in which 10 vol% self-reactive particles (CIP) are uniformly dispersed.
11 is an electron microscope sectional photograph of anisotropic magnetorheic elastomer (a-MRE) in which 10 vol% self-reactive particles (CIP) are oriented in a certain direction.
12 is an electron microscope sectional photograph of an isotropic magnetopule elastomer (i-MRE) in which 40 vol% self-reactive particles (CIP) are uniformly dispersed.
13 is an electron microscope sectional photograph of an anisotropic magnetorheic elastomer (a-MRE) in which self-reactive particles (CIP) of 40 vol% are oriented in a certain direction.
14 is an electron micrograph of a frozen section of anisotropic magnetorheic elastomer (a-MRE) with 10 vol% self-reactive particles (CIP) oriented in a certain direction.
15 is an electron micrograph of a frozen section of an anisotropic magnetorheic elastomer (a-MRE) with 40 vol% self-reactive particles (CIP) oriented in a certain direction.
16 is a graph showing the tensile strength of anisotropic magnetorheic elastomer (a-MRE) according to the production method and the content of self-reactive particles (CIP).
17 is a graph showing the elongation of anisotropic magnetorheic elastomer (a-MRE) according to the production method and the content of self-reactive particles (CIP).
18 is an electron microscope sectional photograph of the anisotropic magnetorheic elastomer (a-MRE) produced by the one-step production method.
19 is an electron microscope sectional photograph of an anisotropic magnetorheic elastomer (a-MRE) produced by the two-step production method.
20 is a graph showing the dynamic elastic modulus of anisotropic magnetorheic elastomer (a-MRE) according to the production method and the content of self-reactive particles (CIP) when a magnetic field is not applied during the test.
21 is a graph showing the dynamic elastic modulus of anisotropic magnetorheic elastomer (a-MRE) according to the production method and the content of self-reactive particles (CIP) when a magnetic field is applied during the test.
22 is a graph showing the magnetorheological effect (MR effect) of the method for producing an anisotropic magnetorheic elastomer (a-MRE) and the content of self-reactive particles (CIP).
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of an apparatus for manufacturing a magnetorheic elastomer according to the present invention, and FIG. 2 is a photograph of an apparatus for manufacturing a magnetorheological elastomer.
In the apparatus for manufacturing a magnetorheic elastomer according to the present invention, a pressing device, a heating device, and a magnetic field applying device are attached to a single device so that a curing reaction can proceed while a magnetic field is applied.
In order to produce the magnetorheic elastomer according to the present invention, the ethylene-acrylic
The apparatus for manufacturing a magnetorheic elastomer according to the present invention is designed so that the temperature range of the
According to an embodiment of the present invention, the
The cured magnetorheic elastomer has a higher modulus variable width due to the improved orientation of the self-reactive particles due to the magnetic field generated in the direction of the arrow in FIG.
The composition of the magnetorheic elastomer according to one embodiment of the present invention is shown in Table 1 below.
(vol%)
The composition ratio of the blending components except for the self-reactive particles (CIP) in Table 1 is expressed as parts by weight per 100 parts by weight of the ethylene-acrylic rubber (AEM), and the composition ratio of the self-reactive particles (CIP) Is expressed as a volume percentage with respect to the volume sum of rubber (AEM) and carbon black (CB).
The present invention relates to an ethylene-acrylic rubber (AEM), a carbon black (CB), a polyamine (A), and a carbon black as shown in Table 1 in order to manufacture a magnetorheological elastomer having low temperature flexibility, heat resistance, oil resistance, weather resistance, damping property, A rubber composition is prepared by mixing PA-curative, processing aid, stearic acid (SA) and di-ortho-tolyl guanidine (DOTG) Is mixed with an appropriate amount of self-reactive particles.
As the self-reactive particles, orientation is induced when a magnetic field is applied to impart modulus variability. The iron is physically and chemically pulverized Silica-coated carbonyl iron powder (CIP) may be used.
The self-reactive particles according to an embodiment of the present invention may be spherical and have an average diameter of 4 to 6 mu m.
Also, since the self-reactive particles are inorganic fillers, if the amount of the filler to be mixed with the rubber composition is too small, the modulus change width of the elastic material is not sufficiently large, and if it is added in an excessive amount, the mechanical properties are decreased and it is not applicable to products requiring constant stiffness Therefore, the optimum amount of charge should be selected considering both mechanical properties and modulus variability.
The optimum charged amount of the self-reactive particles according to an embodiment of the present invention is estimated to be 10 to 40 vol% with respect to the total volume of the ethylene-acrylic rubber (AEM) and the carbon black (CB).
The ethylene-acrylic rubber (AEM) used as the matrix elastomer in the above Table 1 is an acrylic synthetic rubber excellent in low-temperature flexibility, heat resistance, oil resistance, weather resistance and damping property. The ethylene- The reason for use is to prepare a magnetorheological elastomer having excellent low-temperature flexibility, heat resistance, oil resistance, weather resistance, and damping properties.
Carbon black (CB) is preferably added as an ethylene-acrylic rubber reinforcing filler in an amount of about 30 parts by weight based on 100 parts by weight of the ethylene-acrylic rubber in consideration of the mechanical properties of the rubber composition.
The polyamine vulcanizing agent (PA-curative) may be hexamethylene diamine carbamate (trade name: Diak No. 1) as a vulcanizing agent useful for vulcanization of the acrylic synthetic rubber composition. The acrylic rubber- A processing aid (trade name: Vamfrc VAN) may be used to facilitate processing operations such as extrusion, and stearic acid (SA) may be used as an activator to activate curing during vulcanization.
It is preferable to add 1.5 parts by weight of these polyamine vulcanizing agent (PA-curative), processing aid, and stearic acid (SA) to 100 parts by weight of the ethylene-acrylic rubber.
Di-ortho-tolyl guanidine (DOTG) is a vulcanization accelerator having characteristics of providing a rigid product having relatively loose vulcanization accelerating action and having a high hardness. As a vulcanization accelerator, 100 parts by weight of ethylene- By weight based on the total weight of the composition.
According to one embodiment of the present invention, an uncured (uncured) composition of the magnetorheic elastomer is introduced into an apparatus for manufacturing a magnetorheic elastomer according to the present invention to improve the orientation of self-reactive particles filled in the composition, Thereby producing an elastic body.
[ Experimental Example One]
The tensile properties of the magnetorheic elastomer composition of the above Table 1 are shown in FIG. 3 and FIG. 4 as a graph of the tensile properties of the magnetorheic elastomer composition obtained by curing the magnetorheic elastomer composition in the magnetorheological elastomer production apparatus at 165.degree. C. for 20 minutes under the vulcanization conditions.
FIG. 3 shows the tensile strength, and FIG. 4 shows the elongation. In the graph, the symbol? Indicates the isotropic magnetism which does not induce the orientation of self-reactive particles (CIP) Means an isotropic magnetoresistive (isotropic-MRE: i-MRE), that is, an isotropic magnetorheological elastomer in which self-reactive particles (CIP) are uniformly dispersed without applying a magnetic field during curing of a rubber matrix. Anisotropic-MRE (a-MRE), which induces orientation of self-reactive particles (CIP).
As a result of the test, both the isotropic magnetorheic elastomer (i-MRE) and the anisotropic magnetorheological elastomer (a-MRE) showed tensile strength and elongation . ≪ / RTI > This is thought to be a result of the lack of bonding at the interface between the self-reactive particles and the matrix rubber compounded as the mixing amount (filling amount) of the self-reactive particles (CIP) is increased.
The reason that the tensile strength and elongation of the anisotropic magnetorheic elastomer (a-MRE) is relatively smaller than that of the isotropic magnetorheological elastomer (i-MRE) is that the orientation direction of the self-reactive particles (CIP) It is believed that the tensile direction of the tensile specimen is perpendicular to the orientation direction of self-reactive particles (CIP).
Therefore, the tensile strength of the magnetorheological elastomer decreases as the orientation of self-reactive particles (CIP) increases.
Table 2 below shows the values of the tensile properties in [Fig. 3] and [Fig. 4] in tabular form.
CIP
(vol%)
(%)
(%)
Generally, in terms of accumulation of energy, if the energy supplied is transferred to the material without any loss, it is called as elastic (elastic). A part of the energy is lost as an energy form such as heat is called viscous .
The rubber exhibits the behavior corresponding to the intermediate character of the properties of these two ideal materials, and this behavior is called viscoelasticity.
When a constant input is applied to a material that exhibits viscoelastic behavior, the response characteristic is simply expressed in the form of a law of a hook in elasticity, but when the input is in the form of a sinusoidal curve that varies with time, The response has a phase difference.
Now stress to strain γ (t) = γ 0 cosωt to give (t is time) constant stress σ 0, the phase difference δ to a amplitude γ 0, the frequency ω / 2π in the linear viscoelastic body the relation of deformation and stress represents a linear σ (t) = σ 0 cos (ωt + δ) is to jindago obtained, δ and σ 0 / γ 0 = | G | because it is both a function of ω G '(ω) = | G | cosδ, G "(ω) = | G | sin?, Then? (T) becomes as follows.
? (t) =? 0 {G '(?) Cos? T - G' (?) Sin? T}
The first term on the right side of [Equation 1] has the same phase as the deformation, and the second phase has the phase ahead of the deformation by 90 degrees. Thus, G '(ω) is called the elastic modulus (shear storage modulus) and G "(ω) is given by W = πγ 0 2 G" (ω) And is called loss factor (loss factor).
[ Experimental Example 2]
5 to 8 are graphs evaluating the dynamic characteristics of a magnetorheological elastomer (MRE) using a dynamic mechanical analyzer (DMA) of a rubber.
The magnetorheic elastomer composition (MRE) used in this test was obtained by curing the magnetorheic elastomer composition of the above [Table 1] in a magnetorheological elastomer production apparatus at 165 ° C for 20 minutes.
In addition, the dynamic characteristics tester (DMA) used in this test was manufactured so as to evaluate the dynamic characteristics of the magnetorheological elastomer (MRE) while applying the magnetic field by modifying the existing tester.
The viscoelasticity of the MRE can be evaluated with the dynamic characteristics tester (DMA) according to the present invention. The evaluation item, the elastic modulus (storage modulus), can predict the elasticity of the magnetorheological elastomer (MRE) , And when the magnetic field is applied, the magnetorheological effect (MR effect) of the magnetorheic elastomer (MRE) can be grasped by changing this value.
That is, the MR effect (%) = {(G ' 1 - G' 0 ) / G ' 0 } x 100 [
Where G ' 0 Is the elastic modulus when no magnetic field is applied in the dynamic test, and G ' 1 is the elastic modulus when the magnetic field is applied.
[Figure 5] and [Figure 6] show the dynamic modulus of a magnetorheic elastomer (MRE) measured with a dynamic characteristic tester (DMA) according to the present invention. [Figure 5] (A-MRE) in which self-reactive particles (CIP) are oriented in a certain direction, and a test value for an isotropic magnetorheic elastomer (i-MRE) Respectively.
In the graphs of FIG. 5 and FIG. 6, the symbol? Indicates the dynamic modulus of elasticity when no magnetic field is applied to the isotropic magnetorheic elastomer (i-MRE) or the anisotropic magnetorheological elastomer (a-MRE) Indicates the elastic modulus when a magnetic field is applied to an isotropic magnetorheological elastomer (i-MRE) or an anisotropic magnetorheological elastomer (a-MRE).
Referring to the graphs of FIGS. 5 and 6, when a magnetic field is applied regardless of isotropy (i-MRE) or anisotropy (a-MRE), magnetoresistive particles (MRE) , 20, 30, and 40 vol%, the elastic modulus increases. However, when the magnetic field is not applied, the elastic modulus decreases as the self-reactive particle (CIP) increases .
This pattern is more pronounced in anisotropic magnetorheological elastomers (a-MRE) than in isotropic magnetorheological elastomers (i-MRE).
As described above, in the dynamic characteristics test of the magnetorheic elastomer (MRE) according to the present invention, the dynamic modulus of elasticity in the case where a magnetic field is applied regardless of isotropy (i-MRE) or anisotropy (a-MRE) The opposite test values are shown because when the magnetic field is applied, the elastic modulus of the matrix due to the response of the self-reactive particles (CIP) dispersed in the rubber matrix to be oriented in the direction in which the magnetic field is applied by the magnetic field (CIP) dispersed in the rubber matrix act as a viscous element of the viscoelastic body when the magnetic field is not applied.
In addition, this phenomenon is more pronounced in anisotropic magnetorheological elastomers (a-MREs) because self-reactive particles (CIPs) in the rubber matrix are oriented in a chain-like structure in the direction of the magnetic field during the production of anisotropic magnetorheic elastomers And a higher elastic modulus is exhibited when a magnetic field is applied.
[Figure 7] and [Figure 8] show the loss modulus of the magnetorheic elastomer (MRE) measured with a dynamic characteristic tester (DMA), and the loss elastic modulus (MRE ), That is, the damping characteristic can be predicted.
[Figure 7] shows a loss factor when a magnetic field is not applied to an isotropic magnetocrystalline elastomer (i-MRE) or an anisotropic magnetophoric elastomer (a-MRE), and [Figure 8] Shows a loss factor when a magnetic field is applied to an elastic body (i-MRE) or an anisotropic magnetorheological elastomer (a-MRE).
In the graphs of [Fig. 7] and [Fig. 8], the symbol? Indicates the isotropic magnetorheic elastomer (i-MRE) in which self-reactive particles (CIP) are uniformly dispersed, And anisotropic magnetorheic elastomer (a-MRE) oriented in the same direction.
Referring to the graphs of FIG. 7 and FIG. 8, magnetoresistive particles (MRE) are classified into self-reactive particles (CIP) when magnetic fields are not given irrespective of isotropic (i-MRE) (Loss factor) increases with 10, 20, 30, and 40 vol% increments. However, when the magnetic field is applied, the loss factor increases with the increase of self-reactive particles (CIP) Showed a slight decrease.
Thus, when the magnetorheic elastomer (MRE) according to the present invention does not give a magnetic field regardless of isotropy (i-MRE) or anisotropy (a-MRE) , 30, and 40 vol%, the loss factor is greatly increased because the self-reactive particles (CIP) dispersed in the rubber matrix are viscous elements of the viscoelastic body as described in the above dynamic characteristics test .
In addition, when the magnetic field is applied, the loss factor decreases with the increase of the self-reactive particles (CIP), as described in the above dynamic characteristics test, when the magnetic field is applied, It is thought that the elastic modulus of the matrix is increased due to the response that the CIPs attempt to orient in the direction in which the magnetic field is applied by the magnetic field, which is caused by a decrease in the loss factor.
[Figure 9] is a graph comparing the magnetorheological effect (MR effect) of an isotropic magnetorheic elastomer (i-MRE) and an anisotropic magnetorheic elastomer (a-MRE) by the content of self-reactive particles (CIP) ], And the elastic modulus measured in [FIG. 6] were substituted into G ' 0 and G' 1 in the above equation (2), respectively.
In the graph of FIG. 9, the black column shows the MR effect of the isotropic magnetophoretic elastomer (i-MRE) in which self-reactive particles (CIP) are uniformly dispersed, (MR effect) of anisotropic magnetorheic elastomer (a-MRE) oriented in a certain direction.
In the graph of FIG. 9, the self-reactive elastomer (MRE) is increased by 10, 20, 30, and 40 vol% increments of self-reactive particles (CIP) irrespective of isotropic (i-MRE) or anisotropy (MR effect) is also increased with the increase of self-reactive particle (CIP).
In addition, the anisotropic magnetorheic elastomer (a-MRE) showed a larger MR effect than the isotropic magnetorheological elastomer (i-MRE) in all contents of self-reactive particles (CIP) MRE) has a larger MR effect than the isotropic magnetorheic elastomer (i-MRE).
The larger the MR effect is, the greater the area where the external vibration can be absorbed. This is also a main characteristic of the MRE according to the present invention.
The orientation of the self-reactive particles (CIP) can be confirmed by electron micrographs taken on the cross section of the magnetorheic elastomer (MRE), and FIGS. 10 to 15 are graphs showing the isotropic magnetic 1 is an electron micrograph of a cross-section of a rheinomic elastomer (i-MRE) and an anisotropic magnetorheic elastomer (a-MRE).
10] and [12] are electron micrographs of an isotropic magnetopule elastomer (i-MRE) in which self-reactive particles (CIP) are uniformly dispersed, %, And [Fig. 12] shows the case of mixing 40 vol% of self-reactive particles (CIP).
[Figure 11] and [Figure 13] are electron micrographs of anisotropic magnetorheic elastomer (a-MRE) in which self-reactive particles (CIP) are oriented in a certain direction, vol%, and [Fig. 13] shows the case of mixing 40 vol% of self-reactive particles (CIP).
11 and 13 show that the orientation of the self-reactive particles (CIP) is well represented by a chain-like structure, and that the self-reactive particles (CIP) The chain-like structure of [Fig. 13] in which 40 vol% of self-reactive particles (CIP) is mixed is better developed.
[Fig. 14] and [Fig. 15] show the result of freezing the magnetorheic elastomer (MRE) to below the glass transition temperature using liquid nitrogen in order to more clearly discriminate the orientation of self- reactive particles (CIP) (A-MRE) in which 10 vol% of self-reactive particles (CIP) are oriented in a certain direction, and Fig. 15 is a photograph of the fracture surface of a self- (A-MRE) in which 40 vol% of reactive particles (CIP) are oriented in a certain direction, and that the orientation of self-reactive particles (CIP) is improved as the number of self-reactive particles (CIP) .
[ Experimental Example 3]
16] and [17] are graphs showing the tensile properties of an anisotropic magnetorheic elastomer (a-MRE) according to the production method of anisotropic magnetorheic elastomer (a-MRE) and the content of self-reactive particles (CIP).
In this test, the anisotropic magnetorheic elastomer (a-MRE) is composed of the magnetorheic elastomer composition of Table 1 above.
FIG. 16 shows the tensile strength of anisotropic magnetorheic elastomer (a-MRE), and FIG. 17 shows elongation. In the graphs of FIGS. 16 and 17, (A-MRE) manufactured by a one-step manufacturing method, and (2) the physical properties of an anisotropic magnetorheic elastomer (a-MRE) produced by a two- Lt; / RTI >
Here, the one step manufacturing method is a method of manufacturing an anisotropic magnetorheic elastomer (a-MRE) by applying a magnetic field of 1.5 tesla and curing at a curing temperature of 165 ° C. for 20 minutes, The two step manufacturing method consists of (i) first orienting self-reactive particles (CIP) by applying a magnetic field of 1.5 Tesla at 100 ° C, (ii) stopping application of the magnetic field, For 20 minutes to prepare an anisotropic magnetorheic elastomer (a-MRE).
In the two step manufacturing method, the first step temperature is set at 100 ° C. in order to smoothly orient the dispersed self-reactive particles (CIP) by lowering the viscosity of the matrix before curing the rubber matrix .
[Table 3] summarizes the tensile properties of [Fig. 16] and [Fig. 17].
CIP
(vol%)
(MPa)
(%)
(MPa)
(%)
[Table 3] shows that the tensile properties of the anisotropic magnetorheic elastomer (a-MRE) vary depending on the manufacturing method.
That is, the anisotropic magnetorheic elastomer (a-MRE) produced by the one-step manufacturing method has a tensile strength and an elongation of the anisotropic magnetorheic elastomer (a-MRE) Which is lower than that of
As described above in [Experimental Example 1], the better the orientation of the self-reactive particles (CIP), the lower the tensile properties of the magnetorheic elastomer. Thus, the tensile properties are relatively decreased, (A-MRE) will have a better orientation of self-reactive particles (CIP) than the anisotropic magnetorheic elastomer (a-MRE) produced by the two step manufacturing process have.
The orientation of the self-reactive particles (CIP) can be confirmed by photographing the cross section of the magnetorheic elastomer (MRE) using an electron microscope. [Fig. 18] shows the results of the anisotropic magnetorheic elastomer FIG. 19 is an electron microscope sectional photograph of an anisotropic magnetorheic elastomer (a-MRE) produced by a two step manufacturing method.
As can be seen from the cross-sectional electron micrographs of FIG. 18 and FIG. 19, the anisotropic magnetorheic elastomer (a-MRE) produced by the one step manufacturing method has a chain- like structure is well developed. The anisotropic magnetorheic elastomer (a-MRE) produced by the two step manufacturing method has a chain-like structure, one step manufacturing method is relatively superior to the self-reactive particle (CIP) orientation in comparison with the two step manufacturing method.
[Fig. 20] and [Fig. 21] are graphs showing the dynamic modulus of elasticity of an anisotropic magnetorheic elastomer (a-MRE) prepared for each manufacturing method.
[Figure 20] shows the elastic modulus when the magnetic field is not applied in the test according to the content of the self-reactive particle (CIP), and Figure 21 shows the dynamic modulus when the magnetic field is applied ) Is represented by the content of self-reactive particles (CIP).
In the graph of FIG. 20 and FIG. 21, the symbol? Indicates the dynamic modulus of elasticity of the anisotropic magnetorheic elastomer (a-MRE) produced by the one step manufacturing method, Shows the elastic modulus of anisotropic magnetorheic elastomer (a-MRE) produced by the two step manufacturing method.
20 and 21, it can be seen that the dynamic modulus of elasticity of the anisotropic magnetorheic elastomer (a-MRE) varies greatly according to the manufacturing method.
In particular, according to FIG. 21, which shows the dynamic modulus when a magnetic field is applied in the dynamic characteristics test, the anisotropic magnetorheic elastomer (a-MRE) produced by the one step manufacturing method is a self- The elastic modulus increases as the CIP increases by 10, 20, 30, and 40 vol%, but the anisotropic magnetorheic elastomer (a-MRE) produced by the two- ) Showed that the elastic modulus was slightly decreased or not changed with increasing the self reactive particle (CIP).
It is considered that the elastic modulus of the magnetic field is different depending on the manufacturing method, because of the orientation property of the self-reactive particles (CIP).
FIG. 22 is a graph comparing the magnetorheological effect (MR effect) according to the content of self-reactive particles (CIP) according to the production method of anisotropic magnetorheic elastomer (a-MRE) , And the elastic modulus measured at G ' 0 and G' 1 in Equation (2), respectively.
In the graph of FIG. 22, the gray columns show the MR effect of the anisotropic magnetorheic elastomer (a-MRE) produced by the one step manufacturing method, and the black columns show the two step (MR effect) of the anisotropic magnetorheic elastomer (a-MRE) produced by the method of the present invention.
As shown in FIG. 22, the anisotropic magnetorheological elastomer (a-MRE) exhibits a magnetorheological effect (MR effect) as the self-reactive particles (CIP) are increased by 10, 20, 30 and 40 vol% ), And the magnetorheological effect (MR effect) according to the increase of the self-reactive particle (CIP) can be confirmed.
In addition, the anisotropic magnetorheic elastomer (a-MRE) produced by the one step manufacturing method has a larger magnetorheological property than the anisotropic magnetorheic elastomer (a-MRE) produced by the two step manufacturing method Effect (MR effect).
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be.
Therefore, the true scope of protection of the present invention should be determined by the claims.
1. Hydraulic cylinder
2. Electromagnetic coil
3. Mold
4. Sample
5. Support
6. Heater
7. Pressure regulator
8. Thermostats
9. Compressor
10. Power
11. Electromagnet Controller
Claims (7)
100 parts by weight of ethylene-acrylic rubber (AEM);
30 parts by weight of carbon black (CB);
1.5 parts by weight of a polyamine-based vulcanizing agent (curative), a processing aid, and stearic acid;
And 4 parts by weight of a guanidine vulcanization accelerator (DOTG)
The volume of the ethylene-acrylic rubber (AEM) and the carbon black (CB) Wherein the composition is composed of 10 to 40 vol% of magnetic reactive particles added to the total amount of the ethylene-acrylic rubber particles. Elastomer.
Characterized in that the magnetic reactive particles are oriented to exhibit anisotropy. The magnetorheic elastomer of ethylene-acrylic rubber is excellent in low-temperature flexibility, heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect.
Characterized in that the magnetic reactive particles are carbonyl iron powder (CIP). The magnetic reactive particles of the ethylene-acrylic rubber excellent in low temperature flexibility, heat resistance, oil resistance, weatherability, damping property and magnetorheological effect Elastomer.
The magnetic reactive particles are spherical and have an average diameter of 4 to 6 탆. The magnetic reactive particles have an average diameter of 4 to 6 탆. The magnetic reactive particles are ethylene-acrylic Magneto-rheological elastomer of rubber.
(1) a method of one-step preparation in which the uncured (uncured) composition of the ethylene-acrylic rubber self-rupturable elastomer is cured at a curing temperature in a state where a magnetic field is applied, A method for producing an ethylene-acrylic rubber magnetorheological elastomer having excellent characteristics and magnetorheological effect.
Heat resistance, oil resistance, weather resistance, damping property and magnetorheological effect, characterized in that the strength of the magnetic field applied to the uncured composition of the ethylene-acrylic rubber magnetorheic elastomer is 1.5 tesla. (Process for the production of excellent ethylene-acrylic rubber magnetorheological elastomers).
Wherein the curing condition for the uncured composition of the ethylene-acrylic rubber magnetorheic elastomer is 165 DEG C x 20 minutes, and the ethylene-acrylic resin having excellent low temperature flexibility, heat resistance, oil resistance, weather resistance, damping property, (Method for manufacturing a rubbery self - lubricating elastomer).
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| KR1020160060130A KR20170129441A (en) | 2016-05-17 | 2016-05-17 | Ethylene-Acrylic Rubber based magneto-rheological elastomer having excellent low temperature flexibility, heat resistance, oil resistance, weather resistance, damping and MR effect, and the making method of the same |
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| KR1020160060130A KR20170129441A (en) | 2016-05-17 | 2016-05-17 | Ethylene-Acrylic Rubber based magneto-rheological elastomer having excellent low temperature flexibility, heat resistance, oil resistance, weather resistance, damping and MR effect, and the making method of the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200032315A (en) * | 2018-09-18 | 2020-03-26 | 금호타이어 주식회사 | Magnetorheological tire rubber compositie |
| CN113001840A (en) * | 2021-03-19 | 2021-06-22 | 安徽微威胶件集团有限公司 | Device and method for synchronously pre-structuring and vulcanizing magnetorheological elastomer |
| KR102308007B1 (en) * | 2020-10-30 | 2021-10-05 | 주식회사 씨케이머티리얼즈랩 | Magneto rheological fluid and manufacturing method thereof |
-
2016
- 2016-05-17 KR KR1020160060130A patent/KR20170129441A/en not_active Application Discontinuation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200032315A (en) * | 2018-09-18 | 2020-03-26 | 금호타이어 주식회사 | Magnetorheological tire rubber compositie |
| KR102308007B1 (en) * | 2020-10-30 | 2021-10-05 | 주식회사 씨케이머티리얼즈랩 | Magneto rheological fluid and manufacturing method thereof |
| KR102313977B1 (en) * | 2020-10-30 | 2021-10-19 | 주식회사 씨케이머티리얼즈랩 | Magneto rheological fluid and manufacturing method thereof |
| KR102368545B1 (en) * | 2020-10-30 | 2022-03-02 | 주식회사 씨케이머티리얼즈랩 | Magneto rheological fluid and manufacturing method thereof |
| WO2022092383A1 (en) * | 2020-10-30 | 2022-05-05 | 주식회사 씨케이머티리얼즈랩 | Magnetic rheological fluid and method for preparing magnetic rheological fluid |
| JP2023503386A (en) * | 2020-10-30 | 2023-01-30 | シーケー マテリアルズ ラブ カンパニー，リミティド | Magnetorheological fluid and method for producing magnetorheological fluid |
| CN113001840A (en) * | 2021-03-19 | 2021-06-22 | 安徽微威胶件集团有限公司 | Device and method for synchronously pre-structuring and vulcanizing magnetorheological elastomer |
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