JP2002020546A - High damping rubber composition for bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing rubber composition of high damping that has reduced strain dependence in the damping factor and the shear modulus by suppressing the hardening phenomenon in the high shear area as sustaining high damping properties. SOLUTION: This bearing rubber composition of high damping characteristically comprises 100 pts.wt. of the rubber components, 60-100 pts.wt. of carbon black of 120 m2/g of CTAB adsorption specific surface area and >=10 pts.wt. of inorganic filler of less reinforcing effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition for a high damping bearing, and more particularly to a rubber composition for a high damping bearing having little strain dependence of a damping rate and a shear modulus.

[0002]

2. Description of the Related Art In recent years, seismic energy absorbing devices, that is, seismic isolation, seismic isolation, and seismic isolation devices are rapidly spreading. For example, a seismic isolation bearing in which a rubber composition and a hard plate are alternately laminated is used for a bearing of a bridge or a base seismic isolation of a building. This is a rubber composition and a laminate with a hard plate, very hard in the vertical direction, soft in the horizontal direction,
That is, the shear rigidity is reduced, and the natural vibration period of the building is made to be shifted from the vibration period of the earthquake, so that the acceleration received by the building due to the earthquake is extremely small.

The first required characteristics of a high damping bearing include a high damping property in which vibration is converted to heat to attenuate vibration energy and a shear modulus of elasticity as intended. Another reason is that the distortion dependence of these characteristics is small.

[0004] Here, a method of calculating a damping rate and a shear modulus, which are characteristics of the high damping bearing, will be described with reference to the accompanying drawings. FIG. 1 is a diagram in which a shear strain is periodically applied to a bearing from one direction, and the stress of the bearing caused by the shear strain is shown with strain (%) on the horizontal axis and stress on the vertical axis. It is. The damping rate (H _eq ) and the shear modulus (G _eq ) of the support are represented by the following equations (1) and (2), respectively.

[0005]

(Equation 1)

In equation (1), ΔW is the area of the hysteresis loop (the shaded area in the figure). In the equation (2), K _eq is represented by the following equation (3), H represents the total thickness of the rubber layer laminated in the support, and A is the cross-sectional area of the rubber layer.

[0007]

(Equation 2)

As can be seen from the above equation, the damping rate and the shear modulus of the bearing depend on the stress value in the high strain region. For example, if the area of the hysteresis loop hardly changes, but the stress in the high strain region sharply increases, the damping rate decreases and the shear modulus increases.

In general, it has been relatively easy to reduce the strain dependency in a bearing having a low shear modulus. However, in a bearing having a high shear modulus, such as a rubber composition used for a bearing for a bridge, the effect of a so-called hardening phenomenon in which the shear rigidity accompanying the deformation in the shear direction rapidly increases in a high strain region. It was large, and it was difficult to reduce the strain dependence of the shear modulus. In addition, there is a problem that the damping rate decreases as the shear rigidity increases, and the seismic isolation effect cannot be sufficiently obtained.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and has a high damping property while suppressing a hardening phenomenon in a high strain region. An object of the present invention is to provide a high damping bearing rubber composition in which the strain dependency of the damping rate and the shear modulus is reduced.

[0011]

The present inventors have conducted intensive studies to solve the above-mentioned problems. As a result, the rubber composition for high damping bearing contains carbon black having a CTAB adsorption specific surface area of 120 m ² / g or more. By using isoprene rubber as a rubber component or using an inorganic filler having a small reinforcing effect, it is possible to suppress the hardening phenomenon of the support body, maintain high damping, and reduce strain dependence. And completed the present invention.

That is, the rubber composition for a high-damping bearing according to the first embodiment of the present invention comprises a rubber component having 100 parts by weight of C.
It is characterized by containing 60 to 100 parts by weight of carbon black having a TAB adsorption specific surface area of 120 m ² / g or more, and 10 parts by weight or more of an inorganic filler having a small reinforcing effect.

[0013] The rubber composition for high damping bearing according to the second aspect of the present invention comprises at least natural rubber and isoprene rubber as rubber components in a weight ratio of natural rubber: isoprene rubber = 0 to 50: 100 to 50. And carbon black having a CTAB adsorption specific surface area of 120 m ² / g or more based on 100 parts by weight of all rubber components.
It is characterized by containing from 100 parts by weight to 100 parts by weight.

The rubber composition for a high-damping bearing according to the third aspect of the present invention comprises at least natural rubber and isoprene rubber as rubber components in a weight ratio of natural rubber: isoprene rubber = 0 to 50: 100 to 50. And carbon black having a CTAB adsorption specific surface area of 120 m ² / g or more based on 100 parts by weight of all rubber components.
It is characterized by containing from 10 parts by weight to 100 parts by weight of an inorganic filler having a small reinforcing effect.

In the present invention, these high damping bearing rubber compositions preferably contain butadiene rubber as the rubber component.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The rubber composition for high damping bearing according to the first aspect of the present invention (hereinafter referred to as the rubber composition according to the first aspect)
Based on 100 parts by weight of the rubber component, it contains 60 to 100 parts by weight of carbon black having a CTAB adsorption specific surface area of 120 m ² / g or more, and 10 parts by weight or more of an inorganic filler having a small reinforcing effect. .

As the rubber component used in the rubber composition according to the first embodiment, a diene rubber can be used.
Examples of the diene rubber include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), acrylonitrile / butadiene copolymer rubber (NBR), and butyl rubber (IIR). ), Halogenated butyl rubber (Br-IIR, C
1-IIR), chloroprene rubber (CR) and the like. Among them, NR is preferable because of good balance between damping property and workability, and IR is preferable from the viewpoint of reducing the damping property of the support and the strain dependency of the shear modulus. Of these, BR is preferable because it reduces the damping of the bearing and the temperature dependence of the shear modulus. In particular, as BR, 97% by weight to 80% of cis 1,4-polybutadiene rubber having a cis 1,4-bond amount of 90% or more.
It is preferable to use BR consisting of 3% by weight and 20% by weight of syndiotactic 1,2-polybutadiene.

In the rubber composition according to the first embodiment, carbon black having a small particle diameter is used as a filler. Here, the carbon black used is, CTAB adsorption specific surface area of 120 m ² / g or more, preferably, 130m ² /
g to 370 m ² / g of carbon black. CTA
B (cetyltrimethylammonium bromide) specific surface area (hereinafter referred to as CTAB) is a value obtained by measuring the surface area of carbon black available for adsorption to rubber molecules by adsorption of cetyltrimethylammonium bromide.
When the CTAB is within the above range, it is possible to maintain a high damping property of the support using the rubber composition according to the first embodiment. As such carbon black, for example,
SAF, XCF, HCF, MCF and the like can be mentioned. The CATB adsorption specific surface area is as per ASTM D37
It can be measured by the method described in 65-80.

In addition, while maintaining high damping property, damping property,
From the viewpoint of reducing the strain dependence of the shear modulus, CTA
The ratio (CTAB / IA) of B and the iodine adsorption amount (IA) is
Carbon black of 1.0 or less, and CTA
Carbon black having a B / IA of 0.5 to 0.9 is more preferred. The amount of iodine adsorbed was measured according to JIS K62.
21 can be measured.

In the rubber composition according to the first embodiment, the content of the carbon black is 60 to 100 parts by weight, preferably 70 to 90 parts by weight, per 100 parts by weight of the rubber component. is there. If the content is within this range, a high shear modulus can be secured, and a high damping property of the bearing body can be secured.

The rubber composition according to the first embodiment contains an inorganic filler having a small reinforcing effect. Here, the inorganic filler having a small reinforcing effect is an inorganic filler which is not particularly effective in enhancing the mechanical properties of the rubber composition after vulcanization, and hardly expected to have reinforcing properties, and is inert to rubber. And fillers other than carbon black and silica. By using such an inorganic filler, it becomes possible to reduce the strain dependency of the support using the rubber composition of the present embodiment. Examples of the inorganic filler having a small reinforcing effect used in the present embodiment include soft clays such as T-clay, kaolin clay, limestone clay, sericite clay and calcined clay; diatomaceous earth; Magnesium; and the like. Among these, T-clay and kaolin clay are preferred from the viewpoint of maintaining high attenuation.

In the rubber composition according to the first embodiment, the content of the inorganic filler having a small reinforcing effect is 100
10 parts by weight or more based on parts by weight, preferably 1 part by weight
5 to 30 parts by weight. When the content is within this range, the dependency of the damping rate and the shear modulus of the bearing on the strain can be reduced, and the high damping property can be maintained.

Further, the rubber composition according to the first embodiment is a rubber composition
Polymer of aliphatic unsaturated hydrocarbons of type ₅ C, aromatic unsaturated hydrocarbons of type C ₉ or aliphatic unsaturated hydrocarbons of type C ₅ and aromatic unsaturated hydrocarbons of type C ₉ And a thermoplastic resin which is a copolymer of the above.

Examples of the C ₅ aliphatic unsaturated hydrocarbon include:
Pentene contained in C ₅ distillate obtained by thermal cracking of naphtha - (1), pentene - (2), 2-methylbutene - (1), 3-methylbutene - (1), 2- methylbut - (2) Olefinic hydrocarbons such as 2-methylbutadiene- (1,3), pentadiene- (1,2), pentadiene- (1,3), 3-methylbutadiene- (1,
And diolefin-based hydrocarbons such as 2).

The C ₉ aromatic unsaturated hydrocarbon includes:
Α contained in the C ₉ fraction obtained by pyrolysis of naphtha
And vinyl-substituted aromatic hydrocarbons such as -methylstyrene, o-vinyltoluene, m-vinyltoluene and p-vinyltoluene. These can be polymerized or copolymerized by a Friedel-Crafts reaction or the like in the presence of a suitable catalyst. Here, the (co) polymer of aromatic unsaturated hydrocarbons C ₉ system, a polymer of aromatic unsaturated hydrocarbon kind of C _9, aromatic of two or more C ₉ based not It refers to any of saturated hydrocarbon copolymers.

Further, C ₉ type aromatic unsaturated hydrocarbon and C 9
_The copolymer with the penta-system aliphatic unsaturated hydrocarbon preferably has 60 mol% or more, and more preferably 90 mol% or more, of the C ₉ -type aromatic unsaturated hydrocarbon unit. As the number of C ₅ aliphatically unsaturated hydrocarbon units increases, the softening point of the copolymer tends to decrease. The thermoplastic hydrocarbon resin has a softening point (JIS K2207) of 100 ° C. or higher, preferably 120 ° C. or higher, since the molecular weight and the reactivity of the double bond affect the physical properties of the rubber component. Is more preferred.

The content of the resin which may be contained in the rubber composition according to the first embodiment is preferably 15 to 60 parts by weight, more preferably 20 to 50 parts by weight, per 100 parts by weight of the rubber component. When the above resin is contained in this range, the obtained rubber composition has high damping property and excellent elongation at break. Further, the temperature dependency of the damping rate and the shear modulus is reduced.

In the rubber composition according to the first embodiment, in addition to the above-mentioned components, a carbon black other than the above-mentioned carbon black and an inorganic filler other than the above-mentioned inorganic filler having a small reinforcing effect, as long as the object of the present invention is not impaired. A filler can be contained, and examples thereof include fumed silica, calcined silica, precipitated silica, pulverized silica, and fused silica. Other additives, for example, vulcanizing agents such as sulfur and zinc oxide; organic sulfur-containing compounds such as TMTD; organic peroxides such as dicumyl peroxide; N-cyclohexyl-2-benzothiazole sulfenamide ( Vulcanization accelerators such as sulfenamides such as CBS), thiazoles such as mercaptobenzothiazole, thiuram such as tetramethylthiuram monosulfide; vulcanization accelerators such as stearic acid;
Antioxidants such as ketone-amine condensates such as TMDQ, amines such as DNPD, monophenols such as styrenated phenol; phthalic acid derivatives such as DBP and DOP;
It may contain a plasticizer such as monoesters such as sebacic acid derivatives such as BS.

A high-damping bearing bar according to a second aspect of the present invention.
Rubber composition (hereinafter, referred to as a rubber composition according to the second embodiment)
At least natural rubber and isop as rubber components.
Natural rubber: isoprene rubber = 0 by weight ratio
５０50: contained in the range of 100 to 50, and
120m by CTAB for 100 parts by weight of ^Two
/ G or more of 60 parts by weight to 100 parts by weight of carbon black
Parts.

The rubber component contained in the rubber composition according to the second embodiment contains at least NR and IR, and NR and I
The content ratio of R is 0 to 50: 100 to 50 by weight ratio. This is because within the above range, the strain dependency of the damping property and the shear modulus is reduced in a well-balanced manner. In the rubber component, the content of NR and IR is 50 in total of NR and IR.
It is preferably from 90 to 90% by weight, more preferably from 60 to 90% by weight. When it is in the above range, the obtained rubber composition has good damping properties and processability.

Examples of the rubber that can be contained in addition to the NR and IR include the rubbers exemplified as the diene rubber used in the rubber composition according to the first embodiment. Among the exemplified rubbers, it is preferable to contain BR from the viewpoint of reducing the temperature dependency of the damping property and the shear modulus.
In addition, from the viewpoint of increasing the damping property while maintaining the temperature dependence of the support, BR has a cis 1,4-bond amount of 90%.
% Or more of cis 1,4-polybutadiene rubber 97% by weight or more
It is preferable to use a BR consisting of 80% by weight and 3% to 20% by weight of syndiotactic 1,2-polybutadiene. The content of BR is preferably from 10 to 50 parts by weight, more preferably from 20 to 40 parts by weight, based on 100 parts by weight of the rubber component.

As the carbon black contained in the rubber composition according to the second embodiment, those similar to the carbon black exemplified in the rubber composition according to the first embodiment can be exemplified. The content of carbon black is from 60 to 100 parts by weight, preferably from 70 to 90 parts by weight, based on 100 parts by weight of the rubber component. When the content is within this range, a high shear modulus can be secured, and
This is because high damping of the support body can be ensured.

The rubber composition according to the second embodiment can contain a thermoplastic resin.
The same resins as those exemplified as the thermoplastic resin that can be blended in the rubber composition according to the embodiment can be exemplified.
The compounding amount of the exemplified resin is preferably 15 to 60 parts by weight, more preferably 20 to 50 parts by weight, based on 100 parts by weight of the rubber component. When the above resin is contained in this range, the obtained rubber composition has high damping property and excellent elongation at break. Further, the temperature dependency of the damping rate and the shear modulus is reduced.

In the rubber composition according to the second embodiment, in addition to the above components, other additives such as a filler other than the above carbon black, as long as the object of the present invention is not impaired,
It may contain a vulcanizing agent, a vulcanization accelerator, an auxiliary vulcanization accelerator, an antioxidant, a plasticizer and the like. These additives include:
Examples of the additives that can be blended in the rubber composition according to the embodiment can be the same as those exemplified above.

The rubber composition for high damping bearing according to the third embodiment of the present invention (hereinafter referred to as the rubber composition according to the third embodiment)
Means that at least natural rubber and isoprene rubber are used as rubber components in a weight ratio of natural rubber: isoprene rubber = 0.
50: 100 parts by weight of carbon rubber having a CTAB adsorption specific surface area of 120 m ² / g or more based on 100 parts by weight of all rubber components.
It is a rubber composition for a high damping bearing containing 100 parts by weight and 10 parts by weight or more of an inorganic filler having a small reinforcing effect.

The rubber composition according to the third aspect contains at least NR and IR as rubber components, and the content ratio of NR and IR is 0 to 50: 100 to 50 by weight. This is because within the above range, the strain dependency of the damping property and the shear modulus is reduced in a well-balanced manner. In the rubber component, the content of NR and IR is 50 in total of NR and IR.
It is preferably from 90 to 90% by weight, more preferably from 60 to 80% by weight. When it is in the above range, the obtained rubber composition has good damping properties and processability.

As rubbers that can be contained in addition to NR and IR, the rubbers exemplified as diene rubbers used in the rubber compositions according to the first and second embodiments are exemplified. Among the exemplified rubbers, it is preferable to contain BR from the viewpoint of reducing the temperature dependency of the damping property and the shear modulus. From the viewpoint of increasing the damping property while maintaining the temperature dependency of the support, the same BR as the BR exemplified as being preferably blended with the rubber composition according to the first and second aspects is used as the BR. It is preferable to mix them. The content of BR is 10 to 10 parts by weight of the rubber component.
It is preferably 50 parts by weight, more preferably 20 to 40 parts by weight.

As the carbon black contained in the rubber composition according to the third embodiment, those similar to the carbon blacks exemplified in the rubber compositions according to the first and second embodiments can be exemplified. The content of carbon black is 60 parts by weight to 10 parts by weight based on 100 parts by weight of the rubber component.
0 parts by weight, preferably 70 to 90 parts by weight.
When the content is within this range, a high shear modulus can be secured,
In addition, high damping of the support body can be ensured.

The rubber composition according to the third embodiment contains an inorganic filler having a small reinforcing effect. By using such an inorganic filler, it is possible to reduce the strain dependence of the damping rate and the shear modulus. Examples of the inorganic filler having a small reinforcing effect used in the rubber composition according to the third embodiment include inorganic fillers exemplified as the inorganic filler having a small reinforcing effect used in the rubber composition according to the first embodiment. The same thing as is illustrated. In the rubber composition according to the third aspect, the content of the inorganic filler having a small reinforcing effect is at least 10 parts by weight, preferably 15 to 30 parts by weight, based on 100 parts by weight of the rubber component. When the content is within this range, the dependency of the damping rate and the shear modulus of the bearing on the strain can be reduced, and the high damping property can be maintained.

The rubber composition according to the third embodiment can be blended with a thermoplastic resin. As such a resin, a thermoplastic resin that can be blended with the rubber composition according to the first or second embodiment can be used. The same resins as those exemplified above can be exemplified. The amount of the exemplified thermoplastic resin is preferably 15 to 60 parts by weight with respect to 100 parts by weight of the rubber component,
0 to 50 parts by weight is more preferred. When the resin is contained in this range, the damping property of the obtained rubber composition is increased,
It is also excellent in elongation at break. Further, the temperature dependency of the damping rate and the shear modulus is reduced.

In the rubber composition according to the third embodiment, in addition to the above components, other additives such as a filler other than the above carbon black, as long as the object of the present invention is not impaired,
It may contain a vulcanizing agent, a vulcanization accelerator, an auxiliary vulcanization accelerator, an antioxidant, a plasticizer and the like. Examples of these additives include those similar to the additives exemplified as the additives that can be blended in the rubber compositions according to the first and second embodiments.

The unvulcanized rubber composition containing the components shown in the first to third embodiments is appropriately molded and is subjected to a known method,
The vulcanized product of the rubber composition according to the first to third aspects of the present invention can be obtained by heating and vulcanizing at 130 to 170 ° C. using an apparatus.

By adopting the above configuration, the first aspect of the present invention is provided.
In the rubber compositions for high damping bearings according to the first to third aspects, the hardening phenomenon in the high strain region is suppressed, and the strain dependency of the damping rate and the shear modulus is low. The high damping bearing rubber compositions according to the first to third aspects of the present invention containing a specific type of BR as the rubber component have low temperature dependence of the damping rate and the shear modulus.

The bearing body in which the rubber composition for high damping bearing according to the first to third aspects of the present invention is used comprises the above rubber composition of the present invention and, for example, a general structural steel sheet, a cold-rolled steel sheet or the like. And hard plates are alternately laminated. To manufacture the support, after molding and vulcanizing to obtain a sheet-like rubber composition, it may be adhered to a hard plate with an adhesive, or an unvulcanized rubber composition may be used in advance. It may be manufactured by forming into a sheet, laminating it on a hard plate, and then heating and vulcanizing and bonding at the same time. Such supports, for example,
It can be suitably used for applications such as bearing of roads and bridges and base isolation of buildings.

[0045]

Examples (Adjustment of rubber composition) Examples 1 to 6 and Comparative Examples 1 to 2 Compounds excluding the vulcanizing agent were blended with the compositions (units by weight) shown in Table 1 below to obtain B 5 with a Banbury mixer
Kneaded for minutes. The vulcanizing agent was kneaded with an 8-inch open roll. The obtained unvulcanized rubber was press-vulcanized at 148 ° C. for 45 minutes.

(Physical Properties of Rubber Composition)
The rubber composition thus obtained was applied to a 1 mm-thick dumbbell-shaped test piece (J
IS No. 3) and conform to JIS K6251
And the 100% modulus (M₁₀₀) [MPa], 300
% Modulus (M₃₀₀) [MPa], breaking strength (T _B)
[MPa], elongation at break (E_B) [%] Was measured. result
Are shown in Table 1.

(Preparation of Miniature Laminate) The unvulcanized rubber composition obtained above was rolled, the surface was sandblasted, and the unvulcanized rubber and a metal plate (1) coated with a metal adhesive were applied.
(30 mm × 130 mm × 3.0 mm) were alternately laminated, and molded so that four rubber layers and three metal plates were formed. After sandblasting the surfaces of the rubber layers at the upper and lower ends, an end steel plate (130 mm × 130 mm
(× 30 mm) sandwiched the upper and lower sides, and press-vulcanized at 130 ° C. for 275 minutes to produce a miniature laminate having one layer thickness of 3.0 mm.

(Characteristics of Laminate) Each strain at a vertical load of 5.88 MPa and a deformation frequency of 0.5 Hz using a shear tester (100%, 175%, 250%, 300%)
, The shear characteristic values (G _eq , H _eq ) were determined. That is, from the hysteresis loop obtained in the shear characteristic test,
G _eq and H _eq were calculated according to the above formulas (1) and (2).
In addition, G _eq and H _eq when the distortion is 300%, and the distortion is 1
The value divided by G _eq and H _eq at the time of 75% was calculated and defined as strain dependency. The results are shown in Table 1.

[0049]

[Table 1]

<Components in Table> NR: TSR 20 IR: Nipol IR 2200, BR: UBEPOL VCR412 manufactured by Zeon Corporation, Ube Industries, Ltd. (cis 1,4-polybutadiene having 98% cis 1,4-bond amount) (88% by weight of rubber and 12% by weight of syndiotactic 1,2-polybutadiene) ISAF: SHOBLACK N220, manufactured by Showa Cabot Co. (CTAB = 118 m ² / g, CTAB / IA =
1.02) SAF: Niteron # 410, manufactured by Shin-Nikka Carbon (CT
AB = 143 m ^{2 /} g, CTAB / IA = 0.62) Resin: High Resin # 120, manufactured by Toho Chemical Industry Co., Ltd. (Copolymer of C ₅ aliphatic unsaturated hydrocarbon and C ₉ aromatic unsaturated hydrocarbon) CZ: Noxeller CZ, manufactured by Ouchi Shinko Chemical Co., Ltd. (N-cyclohexyl-2-benzothiazylsulfenamide)

[0051]

The high damping bearing rubber composition of the present invention has a high damping rate and a low strain dependency between the damping rate and the shear modulus. Therefore, the rubber composition for a high damping bearing of the present invention is a rubber composition suitable for various vibration energy absorbing devices (particularly, seismic isolation devices).

[Brief description of the drawings]

FIG. 1 is a graph showing a hysteresis curve of a bearing body.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 3/00 C09K 3/00 P F16F 15/08 F16F 15/08 D

Claims (4)

[Claims] (1) CTAB is added to 100 parts by weight of a rubber component.
A rubber composition for a high-damping bearing, comprising 60 to 100 parts by weight of carbon black having an adsorption specific surface area of 120 m ² / g or more and 10 parts by weight or more of an inorganic filler having a small reinforcing effect. . 2. A rubber component containing at least natural rubber and isoprene rubber in a weight ratio of natural rubber: isoprene rubber = 0 to 50: 100 to 50, and based on 100 parts by weight of all rubber components. On the other hand, carbon black having a CTAB adsorption specific surface area of 120 m ² / g or more
A rubber composition for a high-damping bearing, comprising from 100 parts by weight to 100 parts by weight. 3. A rubber component containing at least natural rubber and isoprene rubber in a weight ratio of natural rubber: isoprene rubber = 0 to 50: 100 to 50, and 100 parts by weight of all rubber components. On the other hand, carbon black having a CTAB adsorption specific surface area of 120 m ² / g or more
A rubber composition for a high-damping bearing, comprising from 100 parts by weight to 100 parts by weight, and 10 parts by weight or more of an inorganic filler having a small reinforcing effect. 4. The rubber composition for high damping bearing according to claim 1, wherein the rubber component contains butadiene rubber.