JP7233283B2 - Anti-vibration rubber composition and anti-vibration rubber member - Google Patents

Description

TECHNICAL FIELD The present invention relates to an anti-vibration rubber composition and an anti-vibration rubber member used for anti-vibration applications in vehicles such as automobiles and trains.

In the technical field of anti-vibration rubber, high durability, suppression of increase in loss factor tan δ (loss factor), reduction of dynamic ratio (dynamic ratio [dynamic spring constant (Kd) / static spring constant (Ks)] value ) are required.
Under such circumstances, a method of adding a hydrazide compound to a rubber composition to reduce the dynamic magnification and suppress an increase in the loss factor has been explored (see, for example, Patent Documents 1 and 2).

Japanese Patent Application Laid-Open No. 2010-121082 JP-A-2001-172435

However, if attempts are made to lower the dynamic magnification and suppress the increase in the loss factor by using only the above methods, the viscosity of the unvulcanized rubber composition increases due to the high reactivity of the hydrazide compound, making injection molding difficult. problems are more likely to arise.

The present invention has been made in view of such circumstances, and provides a vibration-isolating rubber composition and a vibration-isolating rubber member that are excellent in injection moldability while satisfying the characteristics required for vibration-isolating rubber such as low dynamic magnification. The purpose is to provide

The present inventors have made intensive studies in order to solve the above problems. In the course of the research, we found that the rubber composition as described above was developed while satisfactorily achieving a low dynamic ratio by using a hydrazide compound for diene rubber such as natural rubber, which is the polymer of the anti-vibration rubber composition. In order to suppress the increase in viscosity when unvulcanized, various experiments were repeated. As a result, when a glycerol fatty acid ester was further added to the above anti-vibration rubber composition, it exhibited satisfactory physical properties. Therefore, the present inventors found that the intended purpose can be achieved by such a composition, and have completed the present invention. .

［３］上記グリセリン脂肪酸エステル（Ｄ）の含有割合が、上記ジエン系ゴム（Ａ）１００重量部に対して０．１～１０重量部の範囲である、［１］または［２］に記載の防振ゴム組成物。
［４］上記ヒドラジド化合物（Ｃ）の含有割合が、上記ジエン系ゴム（Ａ）１００重量部に対して０．０１～５．０重量部の範囲である、［１］～［３］のいずれかに記載の防振ゴム組成物。
［５］上記ヒドラジド化合物（Ｃ）が、アジピン酸ジヒドラジドおよびイソフタル酸ジヒドラジドから選ばれた少なくとも一方である、［１］～［４］のいずれかに記載の防振ゴム組成物。
［６］上記充填剤（Ｂ）の含有割合が、上記ジエン系ゴム（Ａ）１００重量部に対して５～１００重量部の範囲である、［１］～［５］のいずれかに記載の防振ゴム組成物。
［７］上記充填剤（Ｂ）がカーボンブラックである、［１］～［６］のいずれかに記載の防振ゴム組成物。
［８］上記充填剤（Ｂ）の９０重量％以上がカーボンブラックである、［１］～［６］のいずれかに記載の防振ゴム組成物。
［９］上記充填剤（Ｂ）が、カーボンブラックおよびシリカからなり、カーボンブラックとシリカとを、重量比で、カーボンブラック／シリカ＝８０／２０～２０／８０の割合で含有する、［１］～［６］のいずれかに記載の防振ゴム組成物。
［１０］上記充填剤（Ｂ）に含まれるカーボンブラックが、ＦＥＦ級カーボンブラックである、［７］～［９］のいずれかに記載の防振ゴム組成物。
［１１］［１］～［１０］のいずれかに記載の防振ゴム組成物の加硫体からなることを特徴とする防振ゴム部材。 That is, in order to achieve the above objects, the gist of the present invention is the following [1] to [11].
[1] A vibration-insulating rubber composition characterized by containing the following components (A) to (D).
(A) a diene rubber;
(B) Fillers.
(C) a hydrazide compound;
(D) Glycerin fatty acid ester.
[2] The anti-vibration rubber composition according to [1], wherein the hydrazide compound (C) is a dihydrazide compound represented by the following general formula (1).

[3] The content of the glycerin fatty acid ester (D) is in the range of 0.1 to 10 parts by weight with respect to 100 parts by weight of the diene rubber (A). Anti-vibration rubber composition.
[4] Any one of [1] to [3], wherein the content of the hydrazide compound (C) is in the range of 0.01 to 5.0 parts by weight with respect to 100 parts by weight of the diene rubber (A). The anti-vibration rubber composition according to .
[5] The anti-vibration rubber composition according to any one of [1] to [4], wherein the hydrazide compound (C) is at least one selected from dihydrazide adipic acid and dihydrazide isophthalic acid.
[6] The content of the filler (B) is in the range of 5 to 100 parts by weight with respect to 100 parts by weight of the diene rubber (A), according to any one of [1] to [5]. Anti-vibration rubber composition.
[7] The anti-vibration rubber composition according to any one of [1] to [6], wherein the filler (B) is carbon black.
[8] The anti-vibration rubber composition according to any one of [1] to [6], wherein 90% by weight or more of the filler (B) is carbon black.
[9] The filler (B) consists of carbon black and silica, and contains carbon black and silica in a weight ratio of carbon black/silica = 80/20 to 20/80, [1] The anti-vibration rubber composition according to any one of [6].
[10] The anti-vibration rubber composition according to any one of [7] to [9], wherein the carbon black contained in the filler (B) is FEF grade carbon black.
[11] A vibration-isolating rubber member comprising a vulcanized body of the vibration-isolating rubber composition according to any one of [1] to [10].

As described above, the anti-vibration rubber composition of the present invention can exhibit properties excellent in injection moldability while satisfying properties required for anti-vibration rubber, such as low dynamic magnification.

Next, an embodiment of the present invention will be described in detail. However, the present invention is not limited to this embodiment.

The anti-vibration rubber composition of the present invention contains the following components (A) to (D) as described above.
(A) a diene rubber;
(B) Fillers.
(C) a hydrazide compound;
(D) Glycerin fatty acid ester.

The constituent materials of the anti-vibration rubber composition of the present invention are described in detail below.

[Diene rubber (A)]
The anti-vibration rubber composition of the present invention uses a polymer comprising a diene rubber (A). As the diene rubber (A), it is preferable that 50% by weight or more of the diene rubber (A) is natural rubber (NR), more preferably natural rubber only, because it is excellent in terms of strength and low dynamic modulus. is used.
When other diene-based rubbers are used in combination with natural rubber, the diene-based rubbers used in combination include, for example, butadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), isoprene rubber ( IR), acrylonitrile-butadiene rubber (NBR), ethylene-propylene-diene rubber (EPDM), butyl rubber (IIR), chloroprene rubber (CR) and the like. These are used alone or in combination of two or more.

[Filler (B)]
As the filler (B), carbon black, silica, calcium carbonate and the like are used singly or in combination of two or more. Among them, from the viewpoint of vibration characteristics, carbon black is preferable, and 90% by weight or more of the filler (C) is preferably carbon black.

As the carbon black, various grades such as SAF grade, ISAF grade, HAF grade, MAF grade, FEF grade, GPF grade, SRF grade, FT grade and MT grade are used. These are used alone or in combination of two or more. Among them, FEF grade carbon black is preferably used from the viewpoint of vibration characteristics and fatigue resistance.

Examples of the silica include wet silica, dry silica, colloidal silica, and the like. And these are used individually or in combination of 2 or more types.

From the viewpoint of achieving even higher durability, suppression of loss factor increase, and lower dynamic magnification, the BET specific surface area of the silica is preferably 50 to 320 m ² /g, more preferably BET ratio. It is a silica with a surface area of 70-230 m ² /g.
The BET specific surface area of the silica can be measured by, for example, degassing the sample at 200° C. for 15 minutes, and then using a mixed gas (N ₂ : 70%, He: 30%) as the adsorbed gas. (manufactured by Microdata, 4232-II).

In addition, when only carbon black and silica are used together as the filler (B), the weight ratio of carbon black/silica is 80/20 to 20/80. It is preferable from the viewpoint of fatigue. From the same point of view, in the above case, more preferably carbon black / silica = 40/60 to 20/80, more preferably carbon black / silica = 30/70 to 20/ It is to contain at a ratio of 80%.

From the viewpoint of fatigue resistance, the content of the filler (B) as a whole is preferably in the range of 5 to 100 parts by weight with respect to 100 parts by weight of the diene rubber (A), more preferably It is in the range of 20 to 80 parts by weight, more preferably in the range of 40 to 70 parts.

[Hydrazide compound (C)]
As the hydrazide compound (C), monohydrazide compounds, dihydrazide compounds and the like are used alone or in combination of two or more.
Among them, a dihydrazide compound represented by the following general formula (1) is preferably used because it can effectively suppress an increase in dynamic magnification.

In general formula (1) above, R is preferably an alkylene group having 4 to 12 carbon atoms or a cycloalkylene group having 3 to 10 carbon atoms.

Specific examples of the monohydrazide compounds include propionic hydrazide, thiocarbohydrazide, stearic hydrazide, salicylic hydrazide, 3-hydroxy-2-naphthoic hydrazide, p-toluenesulfonyl hydrazide, aminobenz hydrazide, 4-pyridinecarboxylic acid hydrazide and the like. These are used alone or in combination of two or more. Among them, 3-hydroxy-2-naphthoic acid hydrazide is preferable from the viewpoint of lowering the dynamic magnification.

Specific examples of the dihydrazide compound include adipic acid dihydrazide, isophthalic acid dihydrazide, phthalic acid dihydrazide, terephthalic acid dihydrazide, succinic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, oxalic acid dihydrazide, and dodecanoic acid dihydrazide. can give. These are used alone or in combination of two or more. Among them, adipic acid dihydrazide and isophthalic acid dihydrazide are preferable from the viewpoint of lowering the dynamic magnification.

The content of the hydrazide compound (C) is preferably 0.01 to 5.0 parts by weight, more preferably 0.01 to 5.0 parts by weight, based on 100 parts by weight of the diene rubber (A) from the viewpoint of lowering the dynamic magnification. is in the range of 0.1 to 3 parts by weight, more preferably 1 to 3 parts by weight.

[Glycerol fatty acid ester (D)]
The glycerin fatty acid ester (D) is a compound in which a fatty acid is ester-bonded to at least one of the three OH groups of glycerin. There is a triester. In the present invention, glycerin fatty acid monoester is preferably used from the viewpoint of suppressing increase in loss factor.
From the viewpoint of reducing the unvulcanized viscosity of the rubber composition, the fatty acid constituting the glycerin fatty acid ester (D) preferably has 8 or more carbon atoms, more preferably 10 or more carbon atoms, still more preferably 12 or more carbon atoms, and particularly Fatty acids having 16 or more carbon atoms are preferred. Fatty acids may be saturated, unsaturated, linear or branched, but linear saturated fatty acids are particularly preferred. Specific examples of the fatty acids include capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid and linoleic acid. Preferred are lauric acid, myristic acid, palmitic acid and stearic acid, and particularly preferred are palmitic acid and stearic acid.

The content of the glycerin fatty acid ester (D) is preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the diene rubber (A) from the viewpoint of good injection molding. It is preferably in the range of 0.1 to 5.0 parts by weight, more preferably in the range of 1.0 to 3.0 parts by weight.

In addition, in the anti-vibration rubber composition of the present invention, along with the components (A) to (D), which are essential components thereof, a silane coupling agent, a vulcanizing agent, a vulcanization accelerator, a vulcanization aid, and an anti-aging agent. Agents, process oils, etc., may be included as appropriate.

Examples of the silane coupling agent include mercapto-based silane coupling agents, sulfide-based silane coupling agents, amine-based silane coupling agents, epoxy-based silane coupling agents, vinyl-based silane coupling agents, and the like, either alone or Two or more kinds are used together. Among them, it is preferable that the silane coupling agent is a mercapto-based silane coupling agent or a sulfide-based silane coupling agent, because the vulcanization density is increased, which is particularly effective for low dynamic magnification and durability.

Examples of the mercapto-based silane coupling agent include 3-mercaptopropyltrimethoxysilane and 3-mercaptopropyltriethoxysilane. These are used alone or in combination of two or more.

Examples of the sulfide-based silane coupling agent include bis-(3-(triethoxysilyl)-propyl)-disulfide, bis(3-triethoxysilylpropyl) trisulfide, bis-(3-(triethoxysilyl) -propyl)-tetrasulfide, bis(3-trimethoxysilylpropyl) disulfide, bis(2-triethoxysilylethyl) tetrasulfide, bis(2-trimethoxysilylethyl) tetrasulfide, bis(3-triethoxysilylpropyl) ) disulfide, 3-trimethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-triethoxysilylpropyl-N,N-dimethylthiocarbamoyl tetrasulfide, 2-triethoxysilylethyl-N,N-dimethylthio Carbamoyl tetrasulfide, 2-trimethoxysilylethyl-N,N-dimethylthiocarbamoyl tetrasulfide, 3-trimethoxysilylpropyl benzothiazolyl tetrasulfide, 3-triethoxysilylpropyl benzothiazole tetrasulfide, 3-triethoxysilyl Propyl methacrylate monosulfide, 3-trimethoxysilylpropyl methacrylate monosulfide and the like. These are used alone or in combination of two or more.

Examples of the amine-based silane coupling agent include 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2- aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-(N-phenyl)aminopropyltrimethoxysilane and the like. These are used alone or in combination of two or more.

Examples of the epoxy-based silane coupling agent include 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3- glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and the like. These are used alone or in combination of two or more.

Examples of the vinyl-based silane coupling agent include vinyltriethoxysilane, vinyltrimethoxysilane, vinyl-tris(β-methoxyethoxy)silane, vinyldimethylchlorosilane, vinyltrichlorosilane, vinyltriisopropoxysilane, and vinyl-tris. (2-Methoxyethoxy)silane and the like can be mentioned. These are used alone or in combination of two or more.

The content of these silane coupling agents is preferably 0.5 to 20 parts by weight with respect to 100 parts by weight of the diene rubber (A), since they are excellent in low dynamic magnification and durability. It is preferably 1.0 to 10 parts by weight.

Examples of the vulcanizing agent include sulfur (powder sulfur, precipitated sulfur, insoluble sulfur), sulfur-containing compounds such as alkylphenol disulfide, and the like. These are used alone or in combination of two or more.

The content of the vulcanizing agent is preferably in the range of 0.1 to 10 parts by weight, particularly preferably in the range of 0.3 to 5 parts by weight, based on 100 parts by weight of the diene rubber (A). . That is, if the content of the vulcanizing agent is too small, vulcanization reactivity tends to be poor. This is because there is a tendency to decrease.

Examples of the vulcanization accelerator include thiuram, sulfenamide, guanidine, thiazole, aldehyde ammonia, aldehyde amine, and thiourea accelerators. These are used alone or in combination of two or more. Among these, a combination of a thiuram-based vulcanization accelerator and at least one vulcanization accelerator selected from sulfenamide-based, guanidine-based, and thiazole-based vulcanization accelerators is used because it provides excellent compression set. is preferred.

The content of the vulcanization accelerator is preferably in the range of 0.1 to 10 parts by weight, particularly preferably in the range of 0.3 to 5 parts by weight, based on 100 parts by weight of the diene rubber (A). be.

Examples of the thiuram-based vulcanization accelerator include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetrabutylthiuram disulfide (TBTD), tetrakis(2-ethylhexyl)thiuram disulfide (TOT), and tetrabenzylthiuram. disulfide (TBzTD) and the like.

Examples of the sulfenamide-based vulcanization accelerator include N-oxydiethylene-2-benzothiazolylsulfenamide (NOBS), N-cyclohexyl-2-benzothiazolylsulfenamide (CBS), Nt -Butyl-2-benzothiazolesulfenamide (BBS), N,N'-dicyclohexyl-2-benzothiazolesulfenamide and the like. These are used alone or in combination of two or more.

Examples of the guanidine-based vulcanization accelerator include N,N'-diphenylthiourea, trimethylthiourea, N,N'-diethylthiourea, and N,N'-dibutylthiourea. These are used alone or in combination of two or more.

Examples of the thiazole-based vulcanization accelerator include dibenzothiazyl disulfide (MBTS), 2-mercaptobenzothiazole (MBT), 2-mercaptobenzothiazole sodium salt (NaMBT), and 2-mercaptobenzothiazole zinc salt (ZnMBT). etc. These are used alone or in combination of two or more. Among these, dibenzothiazyl disulfide (MBTS) and 2-mercaptobenzothiazole (MBT) are preferably used because of their excellent vulcanization reactivity.

Examples of the vulcanizing aid include zinc oxide (ZnO), stearic acid, magnesium oxide, and the like. These are used alone or in combination of two or more.

The content of the vulcanization aid is preferably in the range of 0.1 to 10 parts by weight, particularly preferably in the range of 0.3 to 7 parts by weight, based on 100 parts by weight of the diene rubber (A). be.

Examples of the anti-aging agent include carbamate-based anti-aging agents, phenylenediamine-based anti-aging agents, phenol-based anti-aging agents, diphenylamine-based anti-aging agents, quinoline-based anti-aging agents, imidazole-based anti-aging agents, and waxes. can give. These are used alone or in combination of two or more.

The content of the anti-aging agent is preferably in the range of 0.5 to 15 parts by weight, particularly preferably in the range of 1 to 10 parts by weight, per 100 parts by weight of the diene rubber (A).

Examples of the process oil include naphthenic oil, paraffinic oil, aromatic oil, and the like. These are used alone or in combination of two or more.

The content of the process oil is preferably in the range of 1 to 35 parts by weight, particularly preferably in the range of 3 to 30 parts by weight, per 100 parts by weight of the diene rubber (A).

[Method for preparing anti-vibration rubber composition]
Here, the anti-vibration rubber composition of the present invention uses the essential components (A) to (D) and, if necessary, the other materials listed above, and kneads, Banbury mixer, open It can be prepared by kneading using a kneader such as a roll or twin-screw stirrer. In addition, it is preferable to knead all the above materials at the same time, but when a vulcanizing agent and a vulcanization accelerator are blended, all the materials except the vulcanizing agent and the vulcanization accelerator are kneaded at the same time. A vulcanizing agent and a vulcanization accelerator are preferably added later.

The anti-vibration rubber composition of the present invention thus obtained is molded by injection molding or the like at a high temperature (150 to 170° C.) for 5 to 30 minutes, and the desired anti-vibration rubber member ( vulcanized body) can be produced.

A vibration-isolating rubber member comprising a vulcanized body of the vibration-isolating rubber composition of the present invention is preferably used as a constituent member of engine mounts, stabilizer bushes, suspension bushes, motor mounts, sub-frame mounts, etc. used in automobiles and the like. Used. Among them, due to its low dynamic magnification and excellent durability, electric vehicles powered by electric motors (electric vehicles (EV), fuel cell vehicles (FCV), plug-in hybrid vehicles (PHV), It can be advantageously used for components (anti-vibration rubber members for electric vehicles) such as motor mounts, suspension bushes, sub-frame mounts, etc. for hybrid vehicles (HV) and the like.
In addition to the above applications, vibration control dampers for computer hard disks, vibration control dampers for general home appliances such as washing machines, vibration control walls for construction in the construction and housing fields, vibration control (vibration control) dampers, etc. It can also be used for (vibration damping) devices and seismic isolation devices.

Next, examples will be described together with comparative examples. However, the present invention is not limited to these examples.

First, prior to Examples and Comparative Examples, the following materials were prepared. The BET specific surface area of silica shown below is a value measured according to the above method.

[Natural rubber (NR)]

[Isoprene rubber (IR)]
Nippon Zeon Co., Ltd. Nipol IR2200

[Butadiene rubber (BR)]
Nippon Zeon Co., Ltd. Nipol 1220

[Zinc oxide]
Manufactured by Sakai Chemical Industry Co., Ltd., two types of zinc oxide

〔stearic acid〕
Made by NOF Co., Ltd., bead stearic acid Sakura

[Anti-aging agent]
Antigen 6C manufactured by Sumitomo Chemical Co., Ltd.

[Carbon black (i)]
SEAST SO (FEF grade carbon black) manufactured by Tokai Carbon Co., Ltd.

[Carbon black (ii)]
SEAST TA (FT grade carbon black) manufactured by Tokai Carbon Co., Ltd.

[Silica (i)]
Nipseal VN3 (BET specific surface area: 180 to 230 m ² /g) manufactured by Tosoh Silica Co., Ltd.

[Silica (ii)]
Nipseal ER manufactured by Tosoh Silica Corporation (BET specific surface area 70 to 120 m ² /g)

[Process oil]
SANSEN 410 manufactured by Japan Sun Oil Co., Ltd.

[Glycerol fatty acid ester (i)]
Rheostat GS-95P manufactured by LION

[Glycerol fatty acid ester (ii)]
Rikemar S-100 manufactured by Riken Vitamin Co., Ltd.

[Hydrazide compound (i)]
Otsuka Chemical Co., Ltd., adipic acid dihydrazide (ADH)

[Hydrazide compound (ii)]
Isophthalic acid dihydrazide (IDH) manufactured by Otsuka Chemical Co., Ltd.

[Hydrazide compound (iii)]
Otsuka Chemical Co., Ltd., 3-hydroxy-2-naphethic acid hydrazide (HNH)

〔Silane coupling agent〕
NXT Z45 manufactured by MOMENTIVE

[Vulcanization accelerator]
Suncellar CZ-G manufactured by Sanshin Chemical Co., Ltd.

[Sulfur (vulcanizing agent)]
Manufactured by Karuizawa Smelter & Refinery

[Examples 1 to 15, Comparative Examples 1 to 7]
A vibration-insulating rubber composition was prepared by blending and kneading the above materials in the proportions shown in Tables 1 and 2 below. In the kneading, first, materials other than the vulcanizing agent and the vulcanization accelerator are kneaded using a Banbury mixer at 140° C. for 5 minutes, then the vulcanizing agent and the vulcanization accelerator are blended, and the open roll is mixed. was kneaded for 5 minutes at 60°C.

Using the anti-vibration rubber compositions of Examples and Comparative Examples thus obtained, each characteristic was evaluated according to the following criteria. The results are also shown in Tables 1 and 2 below.

≪Unvulcanized viscosity≫
The Mooney viscosity (unvulcanized viscosity) at 125° C. of each anti-vibration rubber composition was measured according to JIS 6300-1.
In Tables 1 and 2 below, the measured values of the unvulcanized viscosities in each of Examples and Comparative Examples are indexed when the measured value of the unvulcanized viscosities in Comparative Example 1 is set to 100. Notated.
A value of less than 135 was evaluated as "good", and a value of 135 or more was evaluated as "poor".
The smaller the unvulcanized viscosity value, the better the injection moldability of the unvulcanized rubber.

≪Dynamic Magnification≫
Each anti-vibration rubber composition was press-molded (vulcanized) to prepare a test piece. Then, the static spring constant (Ks) and the dynamic spring constant (Kd100) at a frequency of 100 Hz of the test piece were measured according to JIS K 6394, respectively. Based on the value, the dynamic magnification (Kd100/Ks) was calculated.
Tables 1 and 2 below show the measured values of the dynamic magnification in each example converted into an index when the measured value of the dynamic magnification (Kd100/Ks) in Comparative Example 1 is set to 100.
A value of less than 100 was evaluated as "good", and a value of 100 or more was evaluated as "poor".

From the results in Tables 1 and 2 above, the anti-vibration rubber compositions of Examples have excellent injection moldability due to their low unvulcanized viscosities. It can be seen that the dynamic magnification (Kd100/Ks) is lower than that of the vulcanized body of the anti-vibration rubber composition of Comparative Example 1, which does not contain the anti-vibration rubber composition.
On the other hand, the vulcanizates of the anti-vibration rubber compositions of Comparative Examples 2 and 5 contained the glycerin fatty acid ester but did not contain the hydrazide compound, indicating that the desired low dynamic ratio was not achieved. . The anti-vibration rubber composition of Comparative Example 3 did not contain a glycerin fatty acid ester and had a high unvulcanized viscosity, resulting in concerns about the impact on injection moldability. The anti-vibration rubber compositions of Comparative Examples 4, 6 and 7 did not contain a glycerin fatty acid ester like the anti-vibration rubber composition of Comparative Example 3. We are trying to improve the physical properties by changing the filler and the use of a silane coupling agent. However, even in the anti-vibration rubber compositions of Comparative Examples 4, 6 and 7, it was difficult to lower the unvulcanized viscosity to the desired level, resulting in concerns about the impact on injection moldability.

The anti-vibration rubber composition of the present invention is preferably used as a material for structural members (rubber anti-vibration members) such as engine mounts, stabilizer bushes, suspension bushes, motor mounts, sub-frame mounts, etc. used in automobiles. In addition, vibration control dampers for computer hard disks, vibration control dampers for general home appliances such as washing machines, vibration control walls for construction in the construction and housing fields, vibration control (vibration control) dampers, etc. ) It can also be used as a material for a constituent member (vibration isolator member) of a device and a seismic isolation device.

Claims (8)

It contains the following components (A) to (D), the content of component (B) is in the range of 5 to 100 parts by weight per 100 parts by weight of (A), and the content of component (C) is , (A) is in the range of 0.01 to 5.0 parts by weight per 100 parts by weight, and the content of component (D) is 0.1 to 10 parts by weight per 100 parts by weight of (A) range .
(A) a diene rubber;
(B) Fillers.
(C) a hydrazide compound;
(D) Glycerin fatty acid ester. 2. The anti-vibration rubber composition according to claim 1, wherein said hydrazide compound (C) is a dihydrazide compound represented by the following general formula (1).

3. The anti-vibration rubber composition according to claim 1 , wherein said hydrazide compound (C) is at least one selected from adipic acid dihydrazide and isophthalic acid dihydrazide. The anti-vibration rubber composition according to any one of claims 1 to 3 , wherein the filler (B) is carbon black. 5. The anti-vibration rubber composition according to any one of claims 1 to 4 , wherein 90% by weight or more of the filler (B) is carbon black. Claims 1 to 5 , wherein the filler (B) consists of carbon black and silica, and the weight ratio of carbon black and silica is carbon black/silica = 80/20 to 20/80. The anti-vibration rubber composition according to any one of the items. The anti-vibration rubber composition according to any one of claims 4 to 6 , wherein the carbon black contained in the filler (B) is FEF grade carbon black. A rubber vibration insulator member comprising a vulcanized body of the rubber vibration insulator composition according to any one of claims 1 to 7 .