JPH05140580A - Electrically viscous liquid - Google Patents

Abstract

PURPOSE:To provide a thermally stable electrically viscous liquid giving a large electrically viscous effect and a good dispersing property by dispersing fine particles comprising a mixture of a specific polymeric electrolyte and a polyether in an electrically insulating viscous liquid. CONSTITUTION:(A) Fine particles comprising a mixture of (i) a polymeric electrolyte preferably produced by neutralizing a carboxy aryl group-containing organopolysiloxane of formula I (R<1> is alkyl; R<2> is alkylene; Q is group of formula II, etc.) with a base containing a monovalent or divalent metal and (ii) a polyether are dispersed in (B) an electrically insulating liquid preferably such as a diorganopolysiloxane oil to provide the objective liquid causing no abrasion with peripheral apparatuses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrorheological liquid, that is, a liquid whose viscosity changes by controlling an external voltage. More specifically, the present invention relates to an electrorheological liquid whose yield value is significantly increased by a small voltage, particles are less likely to settle, which is thermally stable, and which does not cause wear on peripheral equipment.

[0002]

2. Description of the Related Art Liquids, the viscosity of which changes when a voltage is applied from the outside, have been attracting attention in recent years because they exhibit actions such as power transmission, shock absorption, and valve effect. Liquids that exhibit a thickening effect by such an electric field are collectively called electrorheological liquids. Above all, in order to withstand highly practical applications such as clutches, engine mounts, shock absorbers, etc. A viscous liquid is needed. Various liquids have been proposed to date. For example, it is typical that inorganic porous particles of silica, alumina, talc, etc. are dispersed in an electrically insulating liquid. The formation of an electric double layer by water adsorbed on the surface of each of these particles causes the particles to be oriented with respect to an external electric field and the viscosity increases (more specifically, a Bingham fluid having a yield value is transferred). (This effect is called the Winslow effect below). In particular, with respect to the system using silica, there are many practical advantages such as the industrial supply of silica and the richness of variety improvement, and many electrorheological liquids have been proposed (US Pat. No. 3,047,507).
No. 6-49998). However, these electrorheological liquids do not provide sufficient performance for industrial use, such as wear to peripheral equipment, sedimentation of particles, and a small degree of Winslow effect. As an electrorheological liquid that improves the above drawbacks,
It has been proposed to disperse a polymer electrolyte in an electrically insulating liquid. A polyelectrolyte is a general term for polymer compounds containing an ion pair in the structure, and many types, natural or synthetic, are known, and an ion exchange resin is the most well known. For example, JP-A-1-180238 discloses an electroviscous liquid obtained by dispersing fine particles of a polymer electrolyte having an amino salt structure in an electrically insulating liquid. Further, JP-A-1-262942 discloses an electroviscous liquid obtained by dispersing particles obtained by pulverizing an ion exchange resin in an electrically insulating liquid. The advantage of using particles of such a polyelectrolyte is that since the particles are organic polymers, their specific gravity is small, so that sedimentation is low, abrasion to peripheral equipment is low, and a relatively large Winslow effect is exhibited. Further, in the case of a synthetic polymer electrolyte, there is also an advantage that particles can be freely designed. However, in electrorheological liquids using polymer electrolyte particles known to date, three-dimensional cross-linking is performed in some way to solidify the electrolyte, and then fine powder is pulverized by a method such as pulverization. It was becoming By such a method, the three-dimensional array of electrolytes is fixed during synthesis and cannot be reworked. In addition, since it is not possible to obtain ideal spherical particles even when pulverized, there is a problem that the dispersion stability and the Winslow effect cannot be sufficiently exhibited. Furthermore, all of the polymer electrolyte particles that have been proposed so far are carbon-based. Silicone oil is the best as an electrically insulating liquid as a dispersion medium, as will be described later, but these carbon-based particles have a problem in that they have poor affinity with silicone oil.

[0003]

As described above, none of the electrorheological liquids proposed so far has shown satisfactory performance. The present inventor has arrived at the present invention as a result of extensive research to solve the above problems. An object of the present invention is to provide a large electrorheological effect (yield value) and good dispersion stability, which is thermally stable even at a high temperature of 100 ° C. or higher and which does not cause friction to peripheral equipment. To provide.

[0004]

MEANS FOR SOLVING THE PROBLEMS AND ACTION THEREOF The present invention provides fine particles composed of a mixture of a polyelectrolyte and a polyether obtained by neutralizing a carboxyaryl group-containing organopolysiloxane with a base containing a monovalent or divalent metal. To an electrorheological liquid obtained by dispersing the above in an electrically insulating liquid.

To explain this, the polyelectrolyte used in the present invention is necessary for imparting a high Winslow effect, particle dispersion stability, abrasion resistance to peripheral equipment, and heat resistance. Examples of the group-containing organopolysiloxane include those represented by the following general formula.

[Chemical 2]

[Chemical 3] This organopolysiloxane can be produced by various synthetic methods, but as an easy and reliable method, a diorganopolysiloxane having a carbinol group at a side chain or a terminal and trimellitic anhydride or pyromellitic anhydride are available. A method of reacting an acid under heating (ring-opening addition of carbinol group to anhydrous ring) is recommended. The characteristics of this organopolysiloxane are as follows. First of all, because the density of carboxyl groups can be increased, high Win
The slow effect can be obtained. Another point is that it has strong crystallinity due to the presence of an aromatic ring and is solid at room temperature, but it is not only meltable (melting point around 175 ° C) because it is a linear polymer. It is also soluble in polar solvents such as tetrahydrofuran. This means that this polymer can exhibit solid physical properties in any processing state, and at the same time, can be processed relatively freely (electrolyte, etc.) primarily and secondarily.

The polyelectrolyte used in the present invention neutralizes the above-mentioned organopolysiloxane with a base containing a monovalent or divalent metal. The base used here is monovalent. Alternatively, it is not particularly limited as long as it contains a divalent metal. The form of base is hydroxide,
A hydride or the like is suitable. The neutralization reaction is preferably carried out in a mixed solvent system of polar solvent and water. However, in order to prevent rearrangement of siloxane bonds, it is preferable to carry out at a low temperature of about 50 ° C or lower. If the "metal ion equivalent / COOH" ratio exceeds 1, the presence of an excess of bases has an adverse effect on the particles or dispersion medium and should be avoided as much as possible.

The structure and composition of the polymer electrolyte obtained as described above are not particularly defined, but a relatively good Winslow effect can be obtained if the following conditions are satisfied. CO
The peralkylsiloxy unit having no OH group does not necessarily have to be present, but its presence brings the following advantages. That is, when the electrolyte is made into particles, it becomes better compatible with the electrically insulating liquid. However, if the proportion of peralkylsiloxy units is increased, on the other hand, the salt structure will decrease, and the Winslow effect will decrease, and the water solubility of the electrolyte will decrease, making the particle formation process difficult. become. Therefore, the ratio of the number of peralkylsiloxy units and the number of units containing COOH groups needs to be within an appropriate range. Regarding the number of COOH groups per aromatic ring, the larger these are, the more the water solubility as an electrolyte is increased, and the Winslow effect is also increased. Again, for this reason, the balance with the peralkylsiloxy unit is appropriately adjusted. Should be taken.
Regarding the neutralization rate per COOH group, the larger this value is, the more the water solubility as an electrolyte is increased and the Winslow effect is increased. Therefore, the larger the value is, the more preferable it is. The neutralization rate must be strictly less than 1 because it may cause decomposition and denaturation of the above substances and may cause leak current, dielectric breakdown and other inconvenient problems as an electrorheological liquid. ..

The polymer electrolytes used in the present invention are all in a solid state at room temperature. When a monovalent metal base is used, it is water-soluble, and when a divalent metal base is used, the water solubility decreases as its proportion increases, and the proportion of the divalent metal base is 100%. %, The polyelectrolyte fine particles become completely insoluble in water. However, when the proportion of the divalent metal base is up to about 75%, suspended water is formed at a concentration of about 20% by weight.

The polyether used in the present invention has an oxyalkylene unit in its structure, such as oxyethylene,
It preferably contains oxypropylene and the like, and may be linear or branched. The terminal group is also not particularly limited. The molecular weight is not particularly limited, but when the terminal group is blocked with an alkyl group or the like, the boiling point is considerably lower than when the terminal group is a hydroxyl group, and particularly when the molecular weight is 100 or less, the object of the present invention (dissipation at high temperature) It is not desirable because it is not possible to eliminate the possibility that it does not meet the requirement) and the possibility that it will ooze out from inside the particles after preparation as an electrorheological liquid. Further, even when the molecular weight is extremely high, there is no problem as long as it can be uniformly mixed with water and the like in the pre-stage of the step of particle formation together with the electrolyte.
However, highly crosslinked polyether is not preferable because it has a low ion dissociation and transport effect as a medium of the electrolyte. The action of the above-mentioned polyether promotes the dissociation of ion pairs in the polyelectrolyte and brings about a high Winslow effect, and unlike low-volatile substances such as water, it can be dissipated outside the system even at high temperatures. Since it does not exist, it functions to give heat resistance to the electrorheological liquid. The method of adsorption to the polymer electrolyte is not particularly limited, but a method of dissolving it in water together with the polymer electrolyte and performing spray drying is efficient and reliable. The amount of adsorption is not particularly limited, but is preferably about 1 to 30% by weight. This is because if it is 1% or less, the Winslow effect is not promoted, and if it is 30% or more, liberation occurs, which causes a leak current.

There are many methods for obtaining fine particles composed of a mixture of the polyelectrolyte and the polyether used in the present invention. One of the methods is to use the polyelectrolyte and the polyether as described above in water. There is a method of dissolving, spraying this aqueous solution in hot air, and drying in a spray state to form fine particles. This method is a method for atomizing a general polymer compound, and is called a spray dryer method.

The electrorheological liquid of the present invention comprises the above-mentioned fine particles of the polymer electrolyte dispersed in the electrically insulating liquid. The electrically insulating liquid is liquid at room temperature,
Any material may be used as long as it exhibits electrical insulation, and the type and the like are not particularly limited. Examples of the electrically insulating liquid include mineral oil, dibutyl sebacate, paraffin chloride,
Fluorine oil and silicone oil are available. Among these,
Silicone oil is preferable in that it has a large electric insulating property and a small change in viscosity with temperature. As the silicone oil, specifically, a diorganopolysiloxane oil having a chemical structure represented by the following formula is preferable.

[Chemical 4] In the formula, R ¹ and R ² are an alkyl group such as a methyl group, an ethyl group and a propyl group; a monovalent hydrocarbon group such as an aryl group such as a phenyl group and a naphthyl group; or a part of them is a fluorine atom or a chlorine atom. , A substituted hydrocarbon group substituted with an amino group, a nitro group, an epoxy group, or the like. Among these, from the viewpoints of material supplyability and economical efficiency, 30 mol% or more of R ¹ and R ² are preferably methyl groups. The degree of polymerization n is not particularly limited, but n is 1000 in terms of a practical viscosity range.
The following is preferable, and 100 is more preferable. The diorganopolysiloxane oil having such a chemical structure is called silicone oil, and there are various commercially available products including SH200 manufactured by Toray Dow Corning Silicone Co., Ltd. Further, among the above-mentioned diorganopolysiloxane oils, as a kind having the effect of promoting the higher Winslow effect and suppressing the sedimentation of particles due to the difference in specific gravity, some of R ¹ and R ² are Diorganopolysiloxanes that are fluoroalkyl groups are preferred. The chemical structure of the fluoroalkyl group is not particularly limited, but a fluoroalkyl group having 10 or less carbon atoms is preferable, and a γ, γ, γ-trifluoropropyl group is particularly preferable in view of easiness of synthesis. Further, in order to remarkably promote the Winslow effect, the content of the fluoroalkyl group is preferably 30 mol% or more. The mechanism by which the fluoroalkyl group gives the promoting effect to the Winslow effect has not been clarified, but since the electronegative atom fluorine and the electropositive atom silicon coexist at an appropriate distance in the molecule, they are strong in the molecule. It can be presumed that a dipole is generated and when the dipole comes into contact with the dispersed particles, the polarization within the particles is promoted. Further, since a liquid containing fluorine tends to have a large specific gravity, an effect of suppressing sedimentation of particles is simultaneously produced. Diorganopolysiloxanes containing such fluoroalkyl groups are available from Toray
FS1265 made by Dow Corning Silicone Co., Ltd.
There are various commercial products such as.

The electrorheological liquid according to the present invention comprises the above-mentioned polymer electrolyte particles dispersed in the above-mentioned electrically insulating liquid, and the amount of dispersion is preferably 0.1 to 50% by weight.
And more preferably 10 to 40% by weight. This is because if it is less than 0.1% by weight, a sufficient thickening effect cannot be obtained, and if it exceeds 50% by weight, the viscosity of the system remarkably increases, which is not suitable for practical use. The electrorheological liquid according to the present invention as described above is useful, for example, as a working oil for a specific device used near room temperature.

[0013]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. The viscosity is a value at 25 ° C. still,
The electrorheological characteristics were measured by the following method. Put the test liquid in an aluminum cup with an inner diameter of 42 mm, and put a 40 mm diameter in it.
An aluminum rotor with a length of 60 mm was submerged. The cylindrical cell was set vertically and the cup was linearly accelerated from zero shear rate (D) to 330 S ⁻¹ over 40 seconds. The torque applied to the rotor at this time was detected by a torque sensor, and this was converted into shear stress (S) to draw a D vs. S curve on an XY recorder. Further, the rotor was electrically grounded, a DC voltage was applied to the cup side to draw a similar D vs. S curve, and the extrapolation point of the straight line portion to the S axis was taken as the yield value at this electric field strength.

[0014]

Example 1 Polydimethylsiloxane in which part of the methyl groups on the side chain was substituted with a hydroxypropyl group and trimellitic anhydride were charged in such a manner that the number of moles of the hydroxyl group and the anhydrous ring were equal, and they were in a molten state at 160 ° C. While stirring at 30
After reacting for minutes, a polymer (1) having the following structure was obtained. Polymer (1)

[Chemical 5] Polymer (1) was a solid with a melting point of about 175 ° C. and was soluble in a polar solvent such as tetrahydrofuran or acetone. Tetrahydrofuran (TH
F) Dissolved in about 1.2 L. On the other hand, C in polymer (1)
The OOH group and the equivalent amount of lithium hydroxide were dissolved in a mixed solvent of 350 ml of tetrahydrofuran and 520 ml of water. A lithium hydroxide solution was added dropwise while stirring the polymer (1) solution at room temperature. The reaction solution was desolvated at 50 ° C. or lower to obtain a white solid. This white solid was water-soluble and insoluble in organic solvents. The melting point is at least 100 ° C compared to polymer (1).
It has risen over. Infrared absorption analysis showed salt structure (-COO ^- L
It was confirmed that i ⁺ ) was formed, that is, the desired polymer electrolyte was obtained. Then, this polyelectrolyte was made into a 30 wt% aqueous solution, and polyethylene glycol having an average molecular weight of 400 having a hydroxyl group at the molecular chain end [Wako Pure Chemical Industries, Ltd., trade name Polyethylene glycol 400] was added to the polyelectrolyte. 25% by weight
In addition to the above, spray dry under the following conditions,
It was made into particles. Atomization method: atomizer method, air pressure:
1.5 kg / cm ² , spray point temperature: about 200 ° C, collection point temperature: about 100 ° C. As a result of feeding 100 g of an aqueous solution of the polymer electrolyte over about 10 minutes, about 15 g of powder was obtained. When this powder was observed with a microscope, it was found to be spherical fine particles having an average particle size of about 10 μm (water content 5%). After spray drying this powder, 140
C. and dried under a nitrogen stream for 4 hours. The weight loss at this time was about 5%. Immediately after drying, it was uniformly dispersed in dimethylpolysiloxane oil (SH200-20CS manufactured by Toray Dow Corning Silicone Co., Ltd.) at a concentration of 33% by weight, and this dispersion was used as an electroviscous liquid. It took 4 to 5 days to start settling of the solid content of this electrorheological liquid when allowed to stand at room temperature, and it was found that the dispersion stability was relatively good. The electrorheological characteristics of this electrorheological liquid were measured and found to be 150 Pa and 2 k at an electric field strength of 1 kV / mm.
A yield value of 230 Pa was obtained at V / mm. The leak current at an electric field strength of 1 kV / mm was about 10 nA / cm ² , which was a very low level. In addition, the cup is filled with this electrorheological liquid at a constant shear rate of 300 S ^-1 for 24 hours.
After continuously rotating for a period of time, the liquid was removed and the aluminum rotor and the cup were observed with the naked eye, but no evidence of wear was observed.

[0015]

Example 2 The electroviscous liquid obtained in Example 1 was immersed in an oil bath at 100 ° C. in an open air atmosphere, and heat-aged for 24 hours. There was no change in the appearance of the liquid due to aging. It took 4 to 5 days to start settling of the solid content by allowing the electrorheological liquid after aging to stand at room temperature, and it was found that the dispersion stability was well maintained. The electrorheological characteristics of this electrorheological liquid were measured and found to be 150 Pa at an electric field strength of 1 kV / mm and 230 Pa at 2 kV / mm.
The yield value of was obtained. The leak current at an electric field strength of 1 kV / mm was about 20 nA / cm ² , which was a very low level. Also, keep the cup filled with this electro-viscous liquid.
After continuing to rotate at a constant shear rate of 00S ^-1 for 24 hours,
When the liquid was removed and the aluminum rotor and the cup were observed, no evidence of wear was apparent.

[0016]

Example 3 100 g of the above polymer (1) was mixed with about 1.
Dissolved in 2L. On the other hand, a mixture of 1/2 equivalent of lithium hydroxide and 1/2 equivalent of calcium hydroxide of the COOH group in the polymer (1) was added with 350 ml of tetrahydrofuran and 5 parts of water.
It was dissolved in 20 ml of mixed solvent. A lithium hydroxide / calcium hydroxide solution was added dropwise while stirring the polymer (1) solution at room temperature. The reaction solution was desolvated at 50 ° C. or lower to obtain a white solid. This white solid was water-soluble and insoluble in organic solvents. The melting point is at least 10 compared to polymer (1).
It rose more than 0 ° C. Infrared absorption analysis shows salt structure (-COO
^- Li ⁺ or (-COO ^-) ₂ Ca ²⁺⁾ that is formed, that it was confirmed that the desired polymer electrolyte was obtained. Next, this polymer electrolyte was made into a 30% by weight aqueous solution, and polyethylene glycol having an average molecular weight of 400 having a hydroxyl group at the end of the molecular chain [Wako Pure Chemical Industries, Ltd., trade name polyethylene glycol 400] was added to the polymer electrolyte. And 25% by weight, and spray drying was performed under the same conditions as those shown in Example 1.
As a result of feeding 100 g of the aqueous solution over about 10 minutes,
About 20 g of powder was obtained. When the powder was observed under a microscope, it was found that the powder had an almost perfect spherical shape with an average particle diameter of about 10 μm. This powder was spray-dried and then dried at 140 ° C. under a nitrogen stream for 4 hours. At this time, the weight loss was about 4%. Immediately after drying, dimethylpolysiloxane oil (SH200-20CS manufactured by Toray Dow Corning Silicone Co., Ltd.) at a concentration of 33% by weight.
Uniformly and physically dispersed in, and this dispersion was used as an electrorheological liquid. It took 4 to 5 days to start settling of the solid content of this electrorheological liquid when allowed to stand at room temperature, and it was found that the dispersion stability was relatively good. When the electrorheological characteristics of this electrorheological liquid were measured, the electric field strength was 1 kV / mm.
At 150 Pa, a yield value of 205 Pa was obtained at 2 kV / mm. The leak current at an electric field strength of 1 kV / mm was about 5 nA / cm ² , which was a very low level. After the cup was continuously rotated at a constant shear rate of 300 S ^-1 for 24 hours while being filled with the electrorheological liquid, the liquid was removed and the aluminum rotor and the cup were observed. Was not recognized.

[0017]

Example 4 The electrorheological liquid obtained in Example 3 was immersed in an oil bath at 100 ° C. in an open air atmosphere, and heat-aged for 24 hours. There was no change in the appearance of the liquid due to aging. It took 4 to 5 days to start settling of the solid content by allowing the electrorheological liquid after aging to stand at room temperature, and it was found that the dispersion stability was well maintained. The electrorheological characteristics of this electrorheological liquid were measured and found to be 150 Pa at an electric field strength of 1 kV / mm and 200 Pa at 2 kV / mm.
The yield value of was obtained. The leak current at an electric field strength of 1 kV / mm was about 20 nA / cm ² , which was a very low level. Also, keep the cup filled with this electro-viscous liquid.
After continuing to rotate at a constant shear rate of 00S ^-1 for 24 hours,
When the liquid was removed and the aluminum rotor and the cup were observed, no evidence of wear was apparent.

[0018]

Comparative Example 1 Wet silica "Nipseal VN3" manufactured by Nippon Silica Industry Co., Ltd. (average particle size: 18 μm) at a concentration of 15% by weight was used as dimethylpolysiloxane oil (SH200-20CS manufactured by Toray Dow Corning Silicone Co., Ltd.).
Uniformly and physically dispersed in, and this dispersion was used as an electrorheological liquid. It took several hours for the solid content of the electrorheological liquid to settle by standing at room temperature, and it was found that the dispersion stability was poor. The electrorheological characteristics of this electrorheological liquid were measured and found to be 65 at an electric field strength of 1 kV / mm.
At Pa of 2 kV / mm, a yield value of 105 Pa was obtained.
Also, the leak current at an electric field strength of 1 kV / mm is about 85 nA.
It was / cm ² . After the cup was continuously rotated at a constant shear rate of 300 S ^-1 for 24 hours while being filled with the electroviscous liquid, the liquid was removed and the aluminum rotor and the cup were observed. Wear marks were observed.

[0019]

Comparative Example 2 The electrorheological liquid obtained in Comparative Example 1 was immersed in an oil bath at 100 ° C. in an open air atmosphere and heat-aged for 24 hours. There was no change in the appearance of the liquid due to aging. The dispersion stability of the electrorheological liquid after aging at room temperature was similar to that before aging. When the electrorheological characteristics of this electrorheological liquid were measured, the electric field strength was 1 kV.
/ Mm, the yield value was 5 Pa and 2 kV / mm was 10 Pa. Moreover, the leak current at an electric field strength of 1 kV / mm is about 2
It was a very low level of 0 nA / cm ² . After the cup was continuously rotated at a constant shear rate of 300 S ^-1 for 24 hours while being filled with the electroviscous liquid, the liquid was removed and the aluminum rotor and the cup were observed. Wear marks were observed.

[0020]

[Comparative Example 3] Acrylic weakly acidic spherical cation exchange resin [Amberlite IRC-76 manufactured by Organo Corporation]
Dimethylpolysiloxane oil (SH200-2 manufactured by Toray Dow Corning Silicone Co., Ltd.) at a concentration of 10% by weight.
0CS) to be physically dispersed, and this dispersion was used as an electrorheological liquid. It took several hours for the solid content of the electrorheological liquid to settle by standing at room temperature, and it was found that the dispersion stability was poor. When the electrorheological characteristics of this electrorheological liquid were measured, the electric field strength was 1 kV / mm.
A yield value of 12 Pa was obtained at 3 Pa and 2 kV / mm. Moreover, the leak current at an electric field strength of 1 kV / mm is about 2 n.
It was A / cm ² . After the cup was continuously rotated at a constant shear rate of 300 S ^-1 for 24 hours while being filled with the electrorheological liquid, the liquid was removed and the aluminum rotor and the cup were observed. Was not recognized.

[0021]

Comparative Example 4 The electrorheological liquid obtained in Comparative Example 3 was immersed in an oil bath at 100 ° C. in an open air atmosphere and heat-aged for 24 hours. There was no change in the appearance of the liquid due to aging. The dispersion stability of the electrorheological liquid after aging at room temperature was similar to that before aging. When the electrorheological characteristics of this electrorheological liquid were measured, the electric field strength was 1 kV.
/ Mm, the yield value under the conditions of 2 kV / mm was below the detection limit. Also, the leak current at an electric field strength of 1 kV / mm is about 1
It was a very low level of nA / cm ² . After the cup was continuously rotated at a constant shear rate of 300 S ^-1 for 24 hours while being filled with the electrorheological liquid, the liquid was removed and the aluminum rotor and the cup were observed. Was not recognized. The results of the electroviscosity test in the above Examples and Comparative Examples are summarized in Table 1.

[Table 1]

[0022]

EFFECT OF THE INVENTION Since the electrorheological liquid of the present invention comprises specific polymer electrolyte particles dispersed in the electrically insulating liquid, it gives a large electrorheological effect (yield value) and good dispersion stability,
It is characterized in that it is thermally stable and does not cause wear on peripheral equipment.

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Claims (3)

[Claims] 1. An electricity obtained by dispersing fine particles of a mixture of a polymer electrolyte and a polyether obtained by neutralizing a carboxyaryl group-containing organopolysiloxane with a base containing a monovalent or divalent metal in an electrically insulating liquid. Viscous liquid. 2. A carboxyaryl group-containing organopolysiloxane has the general formula: The electrorheological liquid according to claim 1, which is a compound represented by: 3. The electrorheological liquid according to claim 1, wherein the electrically insulating liquid is a diorganopolysiloxane oil.