JP2011144320A - Vibration-proof rubber composition and vibration-proof rubber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber composition for a vibration-proof rubber, which is excellent in vibration-proof performance (low dynamic-to-static modulus ratio), is excellent in heat resistance and durability, and can be used suitably in a high temperature environment such as engine rooms of cars. <P>SOLUTION: The vibration-proof rubber composition is prepared as follows: in 100 pts.mass of a dienic rubber, 3 to 4 pts.mass of (A) a peroxide, 2 to 4 pts.mass of (B) a zinc (meth)acrylate, and 0.3 to 0.5 pt.mass of (C) a bismaleimide compound are blended. The total amount of the components (A), (B) and (C) is in the range of 5.5 to 7.3 pts.mass. As fillers, carbon black having an iodine absorption amount of 10 to 70 g/kg and a DBP oil absorption of 25 to 180 ml/100 g and/or silica having a nitrogen absorption specific surface area (BET method) of 70 to 230 m<SP>2</SP>/g are blended. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rubber composition that can be suitably used for vibration-proof rubbers used in high-temperature environments such as automobile torsional dampers, engine mounts, and muffler hangers.

  Conventionally, in various vehicles such as automobiles, in order to improve the comfort of passengers, various anti-vibration materials have been arranged at sites that are sources of vibration and noise to reduce the intrusion of vibration and noise into the room. Attempts have been made. For example, for engines that are the main sources of vibration and noise, vibrations during engine operation are absorbed by using anti-vibration rubber for components such as torsional dampers and engine mounts. Intrusion and noise spread to the surrounding environment.

  As a basic characteristic of such an anti-vibration rubber, a strength characteristic that supports a heavy object such as an engine and an anti-vibration performance that absorbs and suppresses the vibration are required. Furthermore, when used in a high-temperature environment such as an engine room, it has excellent strength characteristics, low dynamic magnification and excellent anti-vibration performance, as well as high heat resistance, durability, and resistance to settling. Is required. In particular, in recent years, the engine room temperature tends to rise as the engine output is increased and the space in the engine room is reduced due to the expansion of the indoor space, etc., and it is often used in more severe environments. Therefore, the requirements for heat resistance and the like of the vibration-proof rubber for automobiles are becoming more severe.

  In general, in order to improve the heat resistance and sag resistance of rubber, it is effective to reduce the amount of sulfur, but if the amount of sulfur is reduced, the durability will deteriorate. As a technique for solving these problems, Japanese Patent Application Laid-Open No. 2008-7546 (Patent Document 1) proposes blending a rubber composition with low-mixed sulfur and zinc acrylate (ZAA). In addition, regarding the addition of zinc acrylate (ZAA) and zinc methacrylate (ZMA), JP-A-62-241045 (Patent Document 2) and JP-A-2-28230 (Patent Document 3), etc. Is also disclosed. However, these techniques have low dynamic magnification and are not satisfactory in all aspects of heat resistance, durability, and sag resistance, and there is still room for improvement in rubber compounding.

  In addition, JP-A-3-258840 (Patent Document 4) and corresponding Patent No. 2897836 (Patent Document 5) propose adding a bismaleimide compound to a rubber composition, thereby improving heat resistance. However, there is a problem that the dynamic magnification deteriorates.

  Furthermore, Japanese Patent Laid-Open No. 2001-64460 (Patent Document 6) uses ethylene / propylene / diene rubber (EPDM) having higher durability than natural rubber (NR) for the purpose of improving heat resistance. It is described that the heat resistance is further improved by vulcanization. However, such a rubber composition has a problem that the basic physical properties required of the vibration-proof rubber are lowered and the durability is further deteriorated.

  In addition, as a technique for subjecting a rubber composition of a base rubber obtained by blending EPDM or EPDM and a diene rubber in place of crosslinking with sulfur to peroxide crosslinking, JP-A-6-200096 (Patent Document 7) and JP Although there is 2001-240703 gazette (patent document 8), both heat resistance and durability were not high.

JP 2008-7546 A JP-A-63-241045 JP-A-2-28230 JP-A-3-258840 Japanese Patent No. 2897836 JP 2001-64460 A JP-A-6-200096 JP 2001-240703 A

  The present invention has been made in view of the above circumstances, and has an anti-vibration rubber composition capable of obtaining a rubber cured product that has not only excellent anti-vibration performance (low dynamic magnification) but also excellent heat resistance and durability, and the An object is to provide a vibration-proof rubber obtained by curing a rubber composition.

  As a result of intensive studies to achieve the above object, the present inventors have improved heat resistance by subjecting a diene rubber to peroxide crosslinking, and by using zinc acrylate or zinc methacrylate, Oxide crosslinking reverses the general tendency to deteriorate the basic physical properties of the vibration-proof rubber, and can suppress the deterioration of the basic physical properties. Further, the bismaleimide compound is used, and the iodine adsorption amount and DBP oil absorption amount within a predetermined range. By blending carbon black having the above or silica having a nitrogen adsorption specific surface area (BET method) within a predetermined range, the vibration-proof performance (low dynamic magnification) is improved, and the present invention has been achieved.

Accordingly, the present invention provides the following rubber composition for vibration-proof rubber and vibration-proof rubber.
[1] 3 to 4 parts by mass of (A) peroxide, 2 to 4 parts by mass of (B) zinc (meth) acrylate, and 0 to (C) bismaleimide compound with respect to 100 parts by mass of diene rubber .3 to 0.5 parts by mass, the total amount of the above components (A), (B) and (C) is in the range of 5.5 to 7.3 parts by mass, and as a filler, iodine adsorption amount Anti-vibration rubber comprising 10 to 70 g / kg, carbon black having DBP oil absorption of 25 to 180 ml / 100 g and / or silica having a nitrogen adsorption specific surface area (BET method) of 70 to 230 m ² / g Composition.
[2] The anti-vibration rubber composition according to claim 1, wherein natural rubber (NR) is used alone as the diene rubber.
[3] The anti-vibration rubber composition according to claim 1, wherein natural rubber (NR) and butadiene rubber are used in combination as the diene rubber.
[4] The anti-vibration rubber composition according to claim 1, wherein natural rubber (NR) and styrene-butadiene rubber (SBR) are used in combination as the diene rubber.
[5] An anti-vibration rubber obtained by curing the rubber composition according to any one of [1] to [4].

  The anti-vibration rubber composition of the present invention is excellent in anti-vibration performance (low dynamic magnification) and excellent in heat resistance and durability.

  The anti-vibration rubber composition of the present invention uses a diene rubber as a rubber component and peroxide-crosslinks the diene rubber. Peroxide, zinc (meth) acrylate, and bis A predetermined amount of maleimide compound is blended.

  As the diene rubber, a known rubber can be used, and is not particularly limited. Specifically, known natural rubber, butadiene rubber, styrene-butadiene rubber (SBR), isoprene rubber, styrene. -Synthetic rubber such as isoprene copolymer, butyl rubber, halogenated butyl rubber, chloroprene rubber, isobutylene-isoprene rubber, acrylonitrile-butadiene rubber, epoxidized natural rubber, acrylate butadiene rubber, and the molecular chain ends of these natural rubber or synthetic rubber Modified ones can be used, and one of these can be used alone, or two or more can be used in combination. In the present invention, natural rubber, butadiene rubber, and styrene-butadiene rubber (SBR) can be preferably used.

  In addition, rubbers other than the diene rubber can be blended in the rubber component as long as the effects of the present invention are not hindered. Examples of the rubber include acrylic rubber and ethylene-propylene-diene rubber (EPDM).

  In the present invention, (A) peroxide is used as a vulcanizing agent. (A) By peroxide-crosslinking the rubber component using a peroxide as a vulcanizing agent, the heat resistance and durability of the anti-vibration rubber can be improved as compared with the case of crosslinking using sulfur. . (A) As the peroxide, those normally used in this field can be blended. Specific examples thereof include dicumyl peroxide, benzoyl peroxide, and 1,1-bis (t-butylperoxy). -3,5,5-trimethylcyclohexane, diisobutyryl peroxide, cumyl peroxyneodecanoate, di-n-propyl peroxydicarbonate, diisopropyl peroxydicarbonate, di-sec-butyl peroxydicarbonate, 1 , 1,3,3-tetramethylbutylperoxyneodecanoate, di (4-t-butylcyclohexyl) peroxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, t-hexylperoxyneodecane Noate, t-butylperoxyneodecanoate, t-butyl Luperoxyneoheptanoate, t-hexylperoxypivalate, t-butylperoxypivalate, di (3,5,5-trimethylhexanoyl) peroxide, dilauroyl peroxide, 1,1,3,3 -Tetramethylbutylperoxy-2-ethylhexanoate, disuccinic acid peroxide, 2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane, t-hexylperoxy-2-ethyl Hexanoate, di (4-methylbenzoyl) peroxide, t-butylperoxy-2-ethylhexanoate, di (3-methylbenzoyl) peroxide, benzoyl (3-methylbenzoyl) peroxide, dibenzoyl peroxide Oxide, 1,1-di (t-butylperoxy) -2-methyl Hexane, 1,1-di (t-hexylperoxy) -3,3,5-trimethylcyclohexane, 1,1-di (t-hexylperoxy) cyclohexane, 1,1-di (t-butylperoxy) Cyclohexane, 2,2-di (4,4-di- (t-butylperoxy) cyclohexyl) propane, t-hexylperoxyisopropyl monocarbonate, t-butylperoxymaleic acid, t-butylperoxy- 3,5,5-trimethylhexanoate, t-butyl peroxylaurate, t-butyl peroxyisopropyl monocarbonate, t-butyl peroxy 2-ethylhexyl monocarbonate, t-hexyl peroxybenzoate, 2,5- Di-methyl-2,5-di (benzoylperoxy) hexane, t-butylperoxya Cetate, 2,2-di- (t-butylperoxy) butane, t-butylperoxybenzoate, n-butyl 4,4-di- (t-butylperoxy) valerate, di (2-t-butylperoxy) Oxyisopropyl) benzene, di-t-hexyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, t-butylcumyl peroxide, di-t-butyl peroxide, p- Menthane hydroperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, diisopropylbenzene hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, cumene hydro In the present invention, α, α′-bis (t-butyl) may be mentioned. Lupa-oxy) 1,3-diisopropylbenzene and dicumyl peroxide can be preferably used. These can be used individually by 1 type or in mixture of 2 or more types.

  The blending amount of the (A) peroxide is limited to 3 to 4 parts by mass with respect to 100 parts by mass of the rubber component. When the amount of the peroxide is less than 3 parts by mass, the heat resistance and dynamic ratio are deteriorated. Moreover, when it exceeds 4 mass parts, the crosslinking density of rubber will become high and basic physical properties, such as anti-vibration performance, and durability will worsen.

  In addition, in the range which does not deviate from the objective of this invention, sulfur can also be mix | blended as a crosslinking adjuvant. When mix | blending this crosslinking adjuvant, it is preferable to make the compounding quantity into the range of 0.1-0.5 mass part with respect to 100 mass parts of rubber components.

  In the present invention, (B) zinc (meth) acrylate is used as a co-crosslinking agent. That is, the co-crosslinking agent itself does not have the ability to form a crosslinking point, but it is an additive that causes a crosslinking reaction in the rubber when used in combination with the above-mentioned (A) peroxide. Zinc acrylate (ZAA) and Zinc methacrylate (ZMA) is used. By using zinc acrylate (ZAA) and / or zinc methacrylate (ZMA), deterioration of basic physical properties of the vibration-proof rubber can be suppressed even when peroxide crosslinking is employed.

  About the compounding quantity of the said (B) (meth) acrylic acid zinc, it is 2-4 mass parts with respect to 100 mass parts of said rubber components. When the blending amount is less than 2 parts by mass, the basic physical properties are deteriorated and the durability is also deteriorated. Moreover, when it exceeds 4 mass parts, the crosslinking density of rubber will become high and a basic physical property and durability will worsen.

［式中、ｘ及びｙはそれぞれ独立に０〜２０のいずれかの整数を示す。Ｒ²は炭素数５〜１８の芳香族基、又はアルキル基を含む炭素数７〜２４の芳香族基を示す。］ In the present invention, (C) bismaleimide compound is used together with zinc (meth) acrylate as a co-crosslinking agent. A known bismaleimide compound can be used, and is not particularly limited, but a bismaleimide compound represented by the following structural formula (1) can be preferably used.

[Wherein, x and y each independently represents an integer of 0 to 20. R ² represents an aromatic group having 5 to 18 carbon atoms or an aromatic group having 7 to 24 carbon atoms including an alkyl group. ]

In the above formula, x and y each independently represent an integer of 0 to 20, more preferably an integer of 0 to 10. R ² represents an aromatic group having 5 to 18 carbon atoms or an aromatic group having 7 to 24 carbon atoms including an alkyl group, and specific examples thereof include aromatic groups having the following structures. In the following structure, two bonds are not described, but in the following structure, a divalent group is constituted by two bonds from two carbon atoms arbitrarily selected.

  Specific examples of the bismaleimide compound represented by the structural formula (1) include N, N′-o-phenylene bismaleimide, N, N′-m-phenylene bismaleimide, and N, N′-p-phenylene bis. Maleimide, N, N ′-(4,4′-diphenylmethane) bismaleimide, 2,2-bis- [4- (4-maleimidophenoxy) phenyl] propane, bis (3-ethyl-5-methyl-4-maleimide) Phenyl) methane and the like can be exemplified. In the present invention, N, N′-m-phenylenebismaleimide and N, N ′-(4,4′-diphenylmethane) bismaleimide can be preferably used. In addition, said bismaleimide compound can be used individually by 1 type or in combination of 2 or more types. The blending amount is preferably in the range of 0.3 to 0.5 parts by mass with respect to 100 parts by mass of the diene rubber. A dynamic magnification will deteriorate that the compounding quantity of a bismaleimide compound is less than 0.3 mass part. Moreover, when it exceeds 0.5 mass part, the crosslinking density of rubber will become high and a basic physical property and durability will worsen.

  The total amount of the components (A), (B), and (C) is in the range of 5.5 to 7.3 parts by mass with respect to 100 parts by mass of the rubber component. It is. If the total amount is less than 5.5 mass, the dynamic magnification deteriorates. On the other hand, when the total amount exceeds 7.3 parts by mass, the crosslink density of the rubber increases, and the basic physical properties and durability deteriorate.

  In the present invention, a fatty acid ester can be blended as another component, thereby improving the dispersibility of the zinc (meth) acrylate with respect to the rubber component during kneading, and the mechanical properties of the rubber after vulcanization. Can be improved. Here, the fatty acid and alcohol constituting the fatty acid ester may both have a linear structure or a branched structure, may be either saturated or unsaturated, and the number of carbon atoms is not particularly limited. . In the present invention, a known fatty acid ester composed of a fatty acid having a chain length of 1 to 30 carbon atoms and an alcohol having a chain length of 1 to 30 carbon atoms can be used. May be ethyl stearate, propyl stearate, butyl stearate, ethyl palmitate, propyl palmitate, butyl palmitate and the like. These can be used alone or in combination of two or more. The amount of the fatty acid ester is preferably 0.02 to 1.2 parts by mass, more preferably 0.2 to 0.6 parts by mass with respect to 100 parts by mass of the rubber component. If the blending amount exceeds 1.2 parts by mass, the rubber may be softened, the workability may be deteriorated, and the dynamic magnification may be deteriorated. If the blending amount is less than 0.02 parts by mass, the dispersibility improvement effect may not be obtained. is there.

  Although this fatty acid ester exhibits an effect of improving dispersibility even when blended separately with the above-mentioned zinc (meth) acrylate at the time of kneading with the rubber component, the (meth) acrylic acid is previously obtained before kneading with the rubber component. By premixing with zinc, the dispersibility of zinc (meth) acrylate in the rubber component can be further improved.

  As the oil, known oils can be used, and are not particularly limited. Specifically, process oils such as aromatic oils, naphthenic oils, paraffin oils, vegetable oils such as palm oil, alkylbenzene oils, etc. Synthetic oil, castor oil, etc. can be used. These can be used alone or in combination of two or more.

  In the present invention, it is recommended to blend carbon black as a filler. As the carbon black, publicly known ones can be used, and are not particularly limited. For example, carbon blacks such as SRF, GPF, FEF, FT, and MT can be exemplified. In the present invention, FEF can be preferably used. Moreover, these carbon blacks may be used individually by 1 type, and may use 2 or more types together. Moreover, about carbon black, it is required to satisfy | fill the numerical range of iodine adsorption amount 10-70 g / kg and DBP oil absorption amount 25-180 ml / 100g, Preferably 30-180 ml / 100g. About the compounding quantity of carbon black, it is preferable that it is 10-80 mass parts with respect to 100 mass parts of said rubber components from the point of low dynamic magnification.

Further, it is recommended that silica be blended as a filler, and silica gel having a nitrogen adsorption specific surface area (BET method) in the range of 70 to 230 m ² / g can be used. About the compounding quantity of the silica used, it is preferable that it is 10-80 mass parts with respect to 100 mass parts of said rubber components from the point of low dynamic magnification.

  In the present invention, from the viewpoint of promoting vulcanization, a vulcanization acceleration aid such as zinc white (ZnO) or a fatty acid can be blended. The fatty acid may be a saturated, unsaturated, linear or branched fatty acid, and is not particularly limited as the carbon number of the fatty acid. For example, the fatty acid has 1 to 30 carbon atoms, preferably 15 to 15 carbon atoms. 30 fatty acids, more specifically naphthenic acid such as cyclohexane acid (cyclohexanecarboxylic acid), alkylcyclopentane having a side chain, hexanoic acid, octanoic acid, decanoic acid (including branched carboxylic acid such as neodecanoic acid), Saturated fatty acids such as dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid (stearic acid), unsaturated fatty acids such as methacrylic acid, oleic acid, linoleic acid, linolenic acid, resin acids such as rosin, tall oil acid, abietic acid, etc. Is mentioned. These may be used alone or in combination of two or more. In the present invention, zinc white and stearic acid can be preferably used. The compounding amount of these vulcanization acceleration aids is preferably 1 to 15 parts by mass, more preferably 2 to 10 parts by mass with respect to 100 parts by mass of the rubber component.

  As the anti-aging agent, known ones can be used, and are not particularly limited, and examples thereof include a phenol type anti-aging agent, an imidazole type anti-aging agent and an amine type anti-aging agent. The blending amount of these anti-aging agents is usually 0.5 to 10 parts by mass, preferably 1 to 5 parts by mass with respect to 100 parts by mass of the rubber component.

  When obtaining the rubber composition of the present invention, there is no particular limitation on the blending method of each of the above components, and all the component raw materials may be blended and kneaded at one time. You may mix | blend and knead | mix. At that time, by premixing with the fatty acid ester before kneading the (meth) zinc acrylate with the rubber component, the dispersibility of the (meth) zinc acrylate in the rubber component is further improved, and the resulting rubber The mechanical properties can be further improved. In the kneading, a kneader such as a roll, an internal mixer, a Banbury rotor or the like can be used. Furthermore, when forming into a sheet shape or a belt shape, a known molding machine such as an extrusion molding machine or a press machine may be used.

  Moreover, there are no particular limitations on the vulcanization conditions for curing the rubber composition, but vulcanization conditions can be generally employed at 140 to 180 ° C. for 5 to 120 minutes.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not restrict | limited to the following Example.

[Examples 1 to 12, Comparative Examples 1 to 13]
Kneaded and vulcanized with the compounding compositions shown in Table 1 and Table 2 below, and vulcanized each rubber composition for anti-vibration rubber of Examples 1-12 and Comparative Examples 1-13 into a predetermined shape under predetermined conditions. Cured to produce a molded product. The obtained molded product was used as an evaluation body of the vibration-proof rubber of the present invention. About the obtained molding, hardness (Hs), tensile elongation (Eb), tensile strength (Tb), heat resistance, durability, static spring constant (Ks) and dynamic magnification (Kd / Ks) are in accordance with the following JIS standards. Measurements were made in accordance with the evaluation. The results are also shown in Tables 1 and 2.

[Hardness (Hs)]
Conforms to JIS K 6253 (Type A) [Tensile elongation (Eb)]
JIS K 6251 compliant [Tensile strength (Tb)]
Conforms to JIS K 6251 [Heat resistance (heat aging test)]
In accordance with JIS K 6257, after leaving the test piece under conditions of 100 ° C. and 500 hours, the tensile elongation (Eb) and the tensile strength (Tb) were measured, and the change rate (%) was shown.
[Durability (Stretch fatigue durability)]
Repeated elongation at 0 to 200% at 35 ° C. was counted as the number of times until breakage. The index display is based on the number of breaks “100” in Comparative Example 1.
[Static spring constant (Ks) and dynamic magnification (Kd / Ks)]
According to JIS K 6385, Kd was measured at 100 Hz. The dynamic magnification (Kd / Ks) was evaluated by the relationship between Kd / Ks and Ks.

  Details of the above formulation are as follows.

Rubber component (1) Natural rubber (NR), “RSS # 1”
(2) Butadiene rubber (BR) "BR01" manufactured by JSR
(3) "SBR1500" manufactured by SBR and JSR
(4) EP103, "EP103AF" manufactured by JSR

Carbon black “N550”, FEF grade carbon black (iodine adsorption amount: 43 g / kg, DBP oil absorption amount: 121 ml / 100 g), manufactured by Asahi Carbon Co., Ltd. “N880”, FT grade carbon black (iodine adsorption amount: 27 g) / Kg, DBP oil absorption: 28 ml / 100 g), manufactured by Asahi Carbon Co., Ltd. “N330”, HAF grade carbon black (iodine adsorption: 82 g / kg, DBP oil absorption: 102 ml / 100 g), Asahi Carbon Co., Ltd. Made
NIPSIL VN3
Precipitated silica manufactured by Tosoh Silica Co., Ltd.
Silane coupling agent (TESPT)
Silane coupling agent manufactured by Evonik Degussa

Naphthenic oil Idemitsu Kosan Co., Ltd., "Diana Process Oil NS-100"
WAX
“Antilux 654” manufactured by Rhein Chemie
Anti-aging agent: RD
2,2,4-Trimethyl-1,2-dihydroquinoline polymer, “NOCRACK 224” manufactured by Ouchi Shinsei Chemical Co., Ltd.
Anti-aging agent: 6PPD
N-phenyl-N ′-(1,3-dimethylbutyl) -p-phenylenediamine, “NOCRACK 6C” manufactured by Ouchi Shinsei Chemical Co., Ltd.

Peroxide No. 1
α, α'-bis (t-butylperoxy) 1,3-diisopropylbenzene
Peroxide No. 2
Dicumyl peroxide

Cross-linking agent A-1
Zinc diacrylate, "SR633" manufactured by Sartomer
Crosslinking agent A-2
Zinc dimethacrylate, “SR634” manufactured by Sartomer
Cross-linking agent B-1
N, N'-m-phenylene bismaleimide, "Barnock PM" manufactured by Ouchi Shinsei Chemical Co., Ltd.
Cross-linking agent B-2
N, N '-(4,4'-diphenylmethane) bismaleimide, "BMI-RB" manufactured by Daiwa Kasei Kogyo Co., Ltd.

Vulcanization accelerator: CBS
N-cyclohexyl-2-benzothiazylsulfenamide (CBS)

  From the results of Tables 1 and 2, the rubber compositions of the examples according to the present invention have good rubber properties, heat resistance, durability, and dynamic magnification. On the other hand, Comparative Examples 1, 2, 4, 8 and 10 had poor dynamic magnification as compared with the examples. Comparative Examples 5-7, 9, 11-13 had poor rubber properties and poor durability. In Comparative Example 3, the dynamic magnification was poor, the rubber physical properties were poor, and the durability was also poor.

Claims (5)

3 to 4 parts by mass of (A) peroxide, 2 to 4 parts by mass of (B) zinc (meth) acrylate, and (C) bismaleimide compound to 0.3 to 100 parts by mass of diene rubber 0.5 parts by mass are respectively blended, and the total amount of the components (A), (B) and (C) is in the range of 5.5 to 7.3 parts by mass, and the amount of iodine adsorption is 10 to 70 g as a filler. Anti-vibration rubber composition comprising carbon black having an oil absorption of 25 to 180 ml / 100 g / kg and / or silica having a nitrogen adsorption specific surface area (BET method) of 70 to 230 m ² / g.   The anti-vibration rubber composition according to claim 1, wherein natural rubber (NR) is used alone as the diene rubber.   The anti-vibration rubber composition according to claim 1, wherein natural rubber (NR) and butadiene rubber are used in combination as the diene rubber.   The anti-vibration rubber composition according to claim 1, wherein natural rubber (NR) and styrene-butadiene rubber (SBR) are used in combination as the diene rubber.   Anti-vibration rubber obtained by curing the rubber composition according to any one of claims 1 to 4.