JPWO2012120638A1 - Anti-vibration rubber composition, method for producing the same, and vulcanized product thereof - Google Patents

Abstract

The anti-vibration rubber composition of the present invention comprises, as a main component, natural rubber or a blend rubber of natural rubber and a diene synthetic rubber, zinc monomethacrylate, a thiazole vulcanization accelerator, and a thiuram vulcanization accelerator. And a sulfur-based vulcanizing agent and carbon black, and the dispersity of the zinc monomethacrylate and carbon black is set in the range of 90 to 100%. For this reason, the anti-vibration rubber composition of the present invention can improve both spring characteristics and physical property degradation due to heat load in addition to the natural rubber characteristics such as low cost and excellent anti-vibration characteristics, and can be used for a long time. Excellent heat aging resistance.

Description

  The present invention relates to an anti-vibration rubber composition, a method for producing the same, and a vulcanized body thereof. More specifically, the present invention relates to an anti-vibration used for an engine mount or the like for suppressing an engine support function and vibration transmission of an automobile or the like. The present invention relates to a rubber composition, a production method thereof, and a vulcanized body thereof.

  In general, various anti-vibration rubbers are used in automobiles for the purpose of reducing vibration and noise. Conventionally, various rubbers have been used as the above-mentioned vibration-proof rubber polymer. Among them, natural rubber (NR) is inexpensive and excellent in vibration-proof characteristics, and thus is frequently used.

  However, sulfur used as a vulcanizing agent for natural rubber is easily decomposed in a high temperature atmosphere of 100 ° C. or higher. For this reason, for example, when used for a vibration-proof rubber material used in an environment that is easily subjected to a thermal load, such as an engine mount rubber, there is a concern about deterioration of spring characteristics and deterioration of physical properties.

  In order to solve such a problem, conventionally, in a vibration-proof rubber composition using natural rubber as a polymer, a method of blending a thiazole vulcanization accelerator together with sulfur to suppress deterioration of physical properties due to heat load has been studied. (For example, refer to Patent Document 1).

  On the other hand, in an anti-vibration rubber composition using natural rubber as a polymer, there is also a technique of improving spring characteristics and stabilizing physical properties by increasing the dispersibility of a reinforcing material (carbon black) (for example, Patent Document 2). And 3).

JP 2003-292671 A JP-A-2005-179479 Japanese Patent No. 2857199

  However, as described above, even if the natural rubber vulcanization system is improved only by the thiazole vulcanization accelerator, there is still room for improvement in this respect because the spring characteristics are deteriorated due to the heat load. .

  Moreover, the deterioration of the spring characteristics due to the thermal load cannot be suppressed only by increasing the dispersibility of the carbon black.

  The present invention has been made in view of such circumstances, and an anti-vibration rubber composition and a method for producing the same, which can improve both spring characteristics and physical property degradation due to heat load, using natural rubber as a polymer, and The purpose is to provide the vulcanizate.

In order to achieve the above object, the present invention is an anti-vibration rubber composition comprising the following (A) as a main component and the following (B) to (F) components, The first gist is a vibration-insulating rubber composition having a degree of dispersion with the component (F) of 90 to 100%.
(A) Natural rubber or blend rubber of natural rubber and diene synthetic rubber.
(B) Zinc monomethacrylate.
(C) A thiazole vulcanization accelerator.
(D) A thiuram vulcanization accelerator.
(E) Sulfur-based vulcanizing agent.
(F) Carbon black.

  The present invention also relates to a method for producing a vibration-proof rubber composition according to the first aspect, wherein (B) component zinc monomethacrylate is added to a part or all of the component (A) rubber, and batch treatment is performed. After that, the second gist is a method for producing a vibration-proof rubber composition in which the polymer batch obtained by this treatment is kneaded with component materials other than the component (B) in the vibration-proof rubber composition.

  Moreover, this invention makes the vulcanized body of the vibration-proof rubber composition of the said 1st summary the 3rd summary.

That is, the inventors of the present invention have made extensive studies in order to solve the above-described problems in a vibration-proof rubber composition using natural rubber as a polymer. In the course of their research, the present inventors have added various vulcanization accelerators and vulcanization aids to natural rubber that undergoes sulfur-based vulcanization in order to suppress deterioration of spring characteristics and physical properties due to heat load. Added to improve the cross-linking system. As a result, in the above vibration-proof rubber composition, it has been found that when a thiazole vulcanization accelerator and a thiuram vulcanization accelerator are used in combination, the deterioration of the spring characteristics due to the heat load can be effectively suppressed. When the rubber composition is formulated so that zinc monomethacrylate is blended as a sulfur assistant and the degree of dispersion of zinc monomethacrylate and carbon black is 90 to 100%, the thermal load is not adversely affected on the spring characteristics. It has been found that the deterioration of physical properties due to can be remarkably improved. Since the combination of the vulcanization accelerator and the vulcanization aid does not adversely affect each other, the anti-vibration rubber composition of the present invention, as described above, has both reduced spring characteristics and physical properties due to heat load. As a result, the heat aging resistance can be improved over a long period of time. Here, the dispersity (X) of zinc monomethacrylate and carbon black is as shown in the following formula (1).
X (%) = 100 − [(aggregation number of zinc monomethacrylate + carbon black) / L value] (1)

  L value = (specific gravity of rubber composition raw material × carbon black mass) / (carbon black specific gravity × total mass of rubber composition raw material) × 100. In addition, since zinc monomethacrylate has a smaller blending amount than carbon black, the parameter of zinc monomethacrylate is omitted in the calculation of the L value.

  By the way, since zinc monomethacrylate is a powder material and its dispersibility is poor, the anti-vibration rubber composition of the present invention showing the degree of dispersion as described above could not be obtained only by blending it directly into the rubber composition. . Accordingly, as a result of intensive research, the inventors added zinc monomethacrylate to a part or all of the polymer rubber, batch-treated, and then treated the polymer batch obtained by this treatment with zinc monomethacrylate. It was found that the anti-vibration rubber composition of the present invention having the above-mentioned characteristics can be efficiently produced by a specific production method such as kneading with the component materials of the anti-vibration rubber composition other than the above.

  Thus, the vibration-proof rubber composition of the present invention is a vibration-proof rubber composition containing, as a main component, natural rubber or a blend rubber of natural rubber and a diene-based synthetic rubber, and containing a sulfur-based vulcanizing agent. In addition to containing a thiazole vulcanization accelerator and a thiuram vulcanization accelerator as a vulcanization accelerator, zinc monomethacrylate as a vulcanization aid, and carbon black as a reinforcing material And the dispersion degree of the zinc monomethacrylate and carbon black is set to the specific range. Therefore, the anti-vibration rubber composition of the present invention can improve both spring characteristics and physical property degradation due to heat load in addition to the natural rubber characteristics such as low cost and excellent anti-vibration characteristics, Has an excellent anti-aging effect. The anti-vibration rubber composition of the present invention is suitably used as an anti-vibration material for engine mounts, stabilizer bushes, suspension bushes and the like used in automobile vehicles. Other than that, damping dampers for computer hard disks, damping dampers for general household electrical appliances such as washing machines, damping walls for buildings in the construction and housing fields, damping damping (damping) dampers, etc. It can also be used for devices and seismic isolation devices.

  In particular, when the thiazole-based vulcanization accelerator is dibenzothiazyl disulfide and the thiuram-based vulcanization accelerator is tetramethylthiuram disulfide, the effect of further suppressing the deterioration of spring characteristics due to heat load is improved. Become.

  Further, when the content ratio of the zinc monomethacrylate is within a specific range, the effect of suppressing deterioration of physical properties due to heat load is further improved.

  Then, zinc monomethacrylate is added to a part or all of the rubber of the polymer rubber (natural rubber or blend rubber of natural rubber and diene synthetic rubber), and after batch treatment, the polymer batch obtained by this treatment When the anti-vibration rubber composition of the present invention is prepared by a specific production method such as kneading with a component material of an anti-vibration rubber composition other than zinc monomethacrylate, the target anti-vibration rubber composition is efficiently produced. It becomes possible.

  Next, embodiments of the present invention will be described in detail.

  The anti-vibration rubber composition of the present invention comprises natural rubber or a blend rubber (component A) of natural rubber and a diene synthetic rubber as a main component, zinc monomethacrylate (component B), and a thiazole vulcanization accelerator. (C component), thiuram vulcanization accelerator (D component), sulfur vulcanizing agent (E component), and carbon black (F component), which are zinc monomethacrylate and carbon The degree of dispersion with black is set in the range of 90 to 100%. In the present invention, the above-mentioned “main component” means a material that greatly affects the properties of the composition, and usually means 55% by weight or more of the entire vibration-proof rubber composition. Further, the “dispersion degree” is as shown in the above-described formula (1). For example, the cut surface of the rubber composition (regardless of vulcanized / unvulcanized) may be used as It can obtain | require by measuring with the manufactured dispersity measuring device (E-Disper PRO).

  As described above, in the vibration-proof rubber composition of the present invention, the degree of dispersion of zinc monomethacrylate and carbon black needs to be set in the range of 90 to 100%, and the degree of dispersion is preferably 92. It is in the range of ˜100%. That is, if the dispersity of zinc monomethacrylate in the anti-vibration rubber composition is smaller than the above range, the physical properties are deteriorated.

  Further, in the vibration-proof rubber composition of the present invention, the content ratio of the component B zinc monomethacrylate is 0.5 to 10 parts relative to 100 parts by weight of the component A rubber (hereinafter abbreviated as “part”). The range is preferably set, and more preferably in the range of 1 to 6 parts. That is, if the content ratio of zinc monomethacrylate is less than the above range, the effect of suppressing deterioration of physical properties due to heat load is poor, and conversely if it is more than the above range, the crosslinked state of the rubber composition changes, and vibration is prevented. This is because there is a risk that the performance and sag resistance may deteriorate.

  As the rubber of component A, as described above, natural rubber or a blend rubber of natural rubber and diene synthetic rubber is used. Examples of the diene-based synthetic rubber include acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), chloroprene rubber (CR), and the like. Or two or more types are used together. When the diene-based synthetic rubber is blended with natural rubber, blending at a ratio of 50% by weight or less of the total component A is possible to disperse zinc monomethacrylate (component B) in the rubber composition. From the viewpoint, it is preferable. If necessary, ethylene-propylene-diene rubber (EPDM) can be blended according to the blend ratio of the diene synthetic rubber. Thus, even if diene synthetic rubber or EPDM is blended with natural rubber at the above ratio, the vibration-insulating rubber composition of the present invention is excellent in vibration-proofing properties and sag resistance.

  And as a vulcanization accelerator used with the said A component and B component, in this invention, a thiazole type | system | group vulcanization accelerator (C component) and a thiuram type vulcanization accelerator (D component) are used together.

  Examples of the thiazole vulcanization accelerator (component C) include dibenzothiazyl disulfide (MBTS), 2-mercaptobenzothiazole (MBT), 2-mercaptobenzothiazole sodium salt (NaMBT), and 2-mercaptobenzothiazole zinc. And a salt (ZnMBT). These may be used alone or in combination of two or more.

  Examples of the thiuram vulcanization accelerator (component D) include tetramethylthiuram disulfide (TMTD), tetrakis (2-ethylhexyl) thiuram disulfide (TOT), tetraethylthiuram disulfide (TETD), tetrabutylthiuram disulfide ( TBTD), tetrabenzylthiuram disulfide (TBzTD) and the like. These may be used alone or in combination of two or more.

  Among these vulcanization accelerators, in particular, the thiazole vulcanization accelerator (component C) may be a combination of dibenzothiazyl disulfide, and the thiuram vulcanization accelerator (component D) may be a combination of tetramethylthiuram disulfide. This is preferable because it is more effective in suppressing the deterioration of the spring characteristics due to heat load.

  In the vibration-proof rubber composition of the present invention, the amount of the thiazole-based vulcanization accelerator (C component) is preferably in the range of 0.1 to 7 parts with respect to 100 parts of the A component rubber, Preferably it is the range of 0.3-5 parts. Further, the blending amount of the thiuram vulcanization accelerator (component D) is preferably in the range of 0.1 to 7 parts, particularly preferably in the range of 0.3 to 5 parts, relative to 100 parts of the rubber of the component A. It is. That is, it is preferable to add a thiazole vulcanization accelerator and a thiuram vulcanization accelerator within this range because the effect of suppressing a decrease in spring characteristics due to a thermal load is further improved.

  Examples of the sulfur-based vulcanizing agent (E component) used together with the A to D components include sulfur (powder sulfur, precipitated sulfur, insoluble sulfur) such as sulfur and sulfur chloride, 2-mercaptoimidazoline, and dipentamethylene thiuram. Examples include pentasulfide. These may be used alone or in combination of two or more.

  The amount of the sulfur vulcanizing agent (component E) is preferably in the range of 0.2 to 7 parts, particularly preferably in the range of 0.3 to 5 parts, with respect to 100 parts of the A component rubber. That is, if the blending amount of the vulcanizing agent is too small, a sufficient cross-linked structure cannot be obtained, and the dynamic magnification and sag resistance tend to deteriorate. Conversely, the blending amount of the vulcanizing agent is too large. This is because the heat resistance tends to decrease.

  Next, examples of the carbon black (F component) used together with the components A to E include SAF class, ISAF class, HAF class, MAF class, FEF class, GPF class, SRF class, FT class, and MT class. Various grades of carbon black are used. These may be used alone or in combination of two or more.

  Here, the compounding amount of the carbon black (component F) is preferably in the range of 10 to 140 parts, particularly preferably in the range of 20 to 70 parts with respect to 100 parts of the rubber of the component A. That is, if the amount of the carbon black is too small, a certain level of reinforcing properties cannot be satisfied. Conversely, if the amount of the carbon black is too large, the dynamic magnification increases or the viscosity increases. This is because there arises a problem that workability deteriorates.

  The anti-vibration rubber composition of the present invention comprises the above components A to F as essential components. In addition to these components, process oil, anti-aging agent, processing aid, white filler, reaction A functional monomer, a foaming agent and the like may be appropriately blended as necessary. In the present invention, as mentioned above, zinc monomethacrylate (component B) is an essential component as a vulcanization aid, but in combination with it, for example, metal monomethacrylate other than component B Vulcanizing aids such as salts (aluminum salts, calcium salts, magnesium salts, etc.), dimethacrylic acid metal salts (zinc salts, aluminum salts, calcium salts, magnesium salts, etc.), zinc white (ZnO), stearic acid, magnesium oxide, etc. It is also possible to blend.

  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 may be used alone or in combination of two or more.

  And the compounding quantity of the said anti-aging agent has the preferable range of 1-10 parts with respect to 100 parts of rubber | gum of A component, Most preferably, it is the range of 2-5 parts.

  Examples of the process oil include naphthenic oil, paraffinic oil, and aroma oil. These may be used alone or in combination of two or more.

  And the compounding quantity of the said process oil has the preferable range of 1-50 parts with respect to 100 parts of rubber | gum of A component, Most preferably, it is the range of 3-30 parts.

  Here, the anti-vibration rubber composition of the present invention can be prepared, for example, as follows. That is, first, zinc monomethacrylate (component B) is added to a part or all of the component A rubber and batch-treated with a pressure kneader or the like. Next, the polymer batch obtained by this treatment was subjected to batch treatment of component materials (C to F components and the remaining rubber (component A rubber only) other than zinc monomethacrylate. And other materials that are appropriately blended if necessary) and kneading using a kneader such as a kneader, a Banbury mixer, an open roll, or a twin screw agitator. In addition, it is preferable from a viewpoint of workability to mix | blend and mix a vulcanizing agent and a vulcanization accelerator (C-E component) last in the case of the said kneading | mixing. By such a production method, zinc monomethacrylate, which is a powder material, can be favorably dispersed without being scattered during rubber kneading. And by the said manufacturing method, it becomes possible to produce efficiently the anti-vibration rubber composition of this invention by which the dispersion degree of the zinc monomethacrylate was set to the specific range.

  The anti-vibration rubber composition of the present invention thus prepared becomes a vulcanized body by heating and is used for anti-vibration applications. This vulcanizate can suppress both the spring characteristics and physical property degradation due to heat load, which could not be realized until now, while maintaining the characteristics of natural rubber. As a result, in a high temperature atmosphere of 100 ° C. or higher. Even so, the heat aging resistance can be improved over a long period without impairing the spring characteristics and physical properties.

  The anti-vibration rubber composition of the present invention is preferably used as an anti-vibration material for engine mounts, stabilizer bushes, suspension bushes, etc. used in automobile vehicles, etc. It can also be used for damping dampers for general household electrical appliances such as machines, damping walls for buildings in the field of construction and housing, damping and damping devices such as damping (damping) dampers, 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 the examples and comparative examples, the following materials were prepared.

[Natural rubber]
Natural rubber

[Butadiene rubber]
Nipol 1220, made by Nippon Zeon

[Zinc oxide]
2 types of zinc oxide, manufactured by Sakai Chemical Industry

〔stearic acid〕
Lunac S30, manufactured by Kao

[Anti-aging agent (i)]
Ozonon 6C, manufactured by Seiko Chemical Co., Ltd.

[Anti-aging agent (ii)]
Non-flex RD, manufactured by Seiko Chemical Co., Ltd.

〔wax〕
Sunnock, Ouchi Shinsei Chemical Co., Ltd.

〔Carbon black〕
Asahi # 50U (average particle size: 70 nm, CTAB specific surface area: 27 m ² / g), manufactured by Asahi Carbon Corporation

〔oil〕
Diana Process 300, manufactured by Idemitsu Kosan Co., Ltd.

[Vulcanization accelerator (i)]
Dibenzothiazyl disulfide (MBTS) (Noxeller DM-P, manufactured by Ouchi Shinsei Chemical Co., Ltd., thiazole vulcanization accelerator)

(Vulcanization accelerator (ii))
N-cyclohexyl-2-benzothiazolylsulfenamide (CBS) (Noxeller CZ, manufactured by Ouchi Shinsei Chemical Co., Ltd., sulfenamide vulcanization accelerator)

(Vulcanization accelerator (iii))
Tetramethylthiuram disulfide (TMTD) (Sunceller TT, manufactured by Sanshin Chemical Industry Co., Ltd., thiuram vulcanization accelerator)

(Vulcanization accelerator (iv))
Tetraethyl thiuram disulfide (TETD) (Sunseller TET, manufactured by Sanshin Chemical Industry Co., Ltd., thiuram vulcanization accelerator)

(Vulcanization accelerator (v))
Tetrabutyl thiuram disulfide (TBTD) (Sunseller TBT, manufactured by Sanshin Chemical Industry Co., Ltd., thiuram vulcanization accelerator)

[Vulcanizing agent]
Sulfur, manufactured by Karuizawa Refinery

[Vulcanization aid]
Zinc monomethacrylate (PRO11542, manufactured by Sartomer)

[Example 1]
70 parts natural rubber, 30 parts butadiene rubber, 5 parts zinc oxide, 2 parts stearic acid, 1.5 parts anti-aging agent (i), 1 part anti-aging agent (ii), 2 parts wax 30 parts of carbon black, 3 parts of oil, 3 parts of vulcanization accelerator (i), 0.4 part of vulcanization accelerator (iii), 0.4 part of vulcanizing agent, and vulcanization aid 3 0.0 parts were prepared. Next, 3.0 parts of the vulcanization aid (25% by weight of vulcanization aid) was added to 1 part of the natural rubber, and batch treatment was performed using a pressure kneader. The polymer batch obtained by this treatment is mixed with the remaining natural rubber (69 parts), butadiene rubber, zinc oxide, stearic acid, anti-aging agent (i), anti-aging agent (ii), and wax. The carbon black and the oil were kneaded at 140 ° C. for 5 minutes using a Banbury mixer. Subsequently, the kneaded product is blended with a vulcanizing agent, a vulcanization accelerator (i), and a vulcanization accelerator (iii), and kneaded at 60 ° C. for 5 minutes using an open roll. An anti-vibration rubber composition was prepared.

[Examples 2 to 6]
As shown in Table 1 and Table 2 below, an anti-vibration rubber composition was prepared according to Example 1 except that the amount of each component was changed.

[Comparative Example 1]
70 parts natural rubber, 30 parts butadiene rubber, 5 parts zinc oxide, 2 parts stearic acid, 1.5 parts anti-aging agent (i), 1 part anti-aging agent (ii), 2 parts wax 30 parts of carbon black and 3 parts of oil were blended at the same time, and these were kneaded at 140 ° C. for 5 minutes using a Banbury mixer. Next, 0.4 part of the vulcanizing agent, 3 parts of the vulcanization accelerator (i), and 0.4 part of the vulcanization accelerator (iii) are blended in this kneaded product, and using an open roll, An anti-vibration rubber composition was prepared by kneading at 60 ° C. for 5 minutes.

[Comparative Example 2]
100 parts of natural rubber, 5 parts of zinc oxide, 1 part of stearic acid, 1 part of anti-aging agent (i), 2 parts of wax, 30 parts of carbon black, 3 parts of oil, and vulcanizing aid 3. 0 parts were blended at the same time, and these were kneaded at 140 ° C. for 5 minutes using a Banbury mixer. Next, 1 part of the vulcanizing agent, 2 parts of the vulcanization accelerator (ii), and 1 part of the vulcanization accelerator (iii) are blended in this kneaded product, and 5 ° C. at 60 ° C. An anti-vibration rubber composition was prepared by kneading for minutes.

[Comparative Examples 3 to 5]
As shown in Table 2 below, an anti-vibration rubber composition was prepared according to Comparative Example 2 except that the amount of each component was changed.

  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 shown in Tables 1 and 2 below.

[Dispersion degree of zinc monomethacrylate and carbon black]
The degree of dispersion (%) between zinc monomethacrylate and carbon black was determined by measuring the cut surface of each anti-vibration rubber composition with a dispersity measuring device (E-Disper PRO) manufactured by Toko Industry Co., Ltd. .

[Initial physical properties]
Each anti-vibration rubber composition was press-molded (vulcanized) under the conditions of 160 ° C. × 20 minutes to produce a rubber sheet having a thickness of 2 mm. And, from this rubber sheet, a JIS No. 5 dumbbell was punched out, and using this dumbbell, its breaking strength (TB) and breaking elongation (EB) were measured in accordance with JIS K 6251.

[Change rate of elongation at break after heat aging]
The prepared rubber sheet is heat-aged in a 100 ° C. atmosphere for a predetermined time (70 hours and 500 hours), and then the elongation at break (EB) is measured in the same manner as described above, and the initial rubber (before heat-aging). The degree of decrease in elongation at break after heat aging (rate of change in elongation at break after heat aging) (%) relative to the elongation at break of the sheet was calculated.

[Change rate of static shear modulus after heat aging]
The static shear modulus of the produced rubber sheet was measured according to JIS K 6254. Here, it is assumed that the spring characteristic change after heat aging = the change in hardness, and the change in hardness was determined by using the rate of change of the static shear modulus as an index. This measurement was performed on an initial rubber sheet (before heat aging) and a rubber sheet after heat aging in a 100 ° C. atmosphere for a predetermined time (70 hours and 500 hours). Then, the degree of increase in static shear modulus after heat aging (rate of change in static shear modulus after heat aging) (%) relative to the static shear modulus of the initial rubber sheet was calculated.

  From the above results, the rubber compositions of the examples are excellent in the initial physical properties (TB, EB) as vibration-proof rubber compositions, the rate of change in elongation at break after heat aging, and the static shear modulus after heat aging. Both rates of change are small. Therefore, it turns out that the rubber composition of an Example is a rubber composition by which both deterioration of a spring characteristic and physical property fall were suppressed even after heat aging.

  On the other hand, in the rubber composition of Comparative Example 1, the change in the static shear modulus after heat aging is maintained at the same performance as the rubber composition of the example, but more than the rubber composition of the example. The deterioration of the breaking elongation change rate after heat aging (after 500 hours) could not be suppressed. The rubber composition of Comparative Example 2 could not suppress the change in static shear modulus after heat aging compared to the rubber composition of Examples. The rubber compositions of Comparative Examples 3, 4, and 5 resulted in inferior initial physical properties (TB, EB) as compared to the rubber compositions of the examples.

  In Example 1, for example, a predetermined amount of butadiene rubber is blended with natural rubber as the polymer of the rubber composition, but when other diene synthetic rubbers (NBR, SBR, IR, CR) are blended, Similar to the above examples, it has been confirmed by experiments that excellent results can be obtained.

  Moreover, in the said Example, although the specific form in this invention was shown, the said Example is only a mere illustration and is not interpreted limitedly. Further, all modifications belonging to the equivalent scope of the claims are within the scope of the present invention.

  The anti-vibration rubber composition of the present invention can be expected as an anti-vibration material having both reduced change in spring characteristics after heat aging and suppression of deterioration in physical properties. For this reason, it is preferably used as an anti-vibration material for engine mounts, stabilizer bushes, suspension bushes, etc. used in automobile vehicles, but other than that, it is also used for vibration control dampers for computer hard disks, general household appliances such as washing machines. It can also be used for applications such as vibration dampers, building vibration control walls in buildings and housing, vibration control devices such as vibration control (vibration control) dampers, and seismic isolation devices.

Claims (5)

An anti-vibration rubber composition comprising the following (A) as a main component and the following (B) to (F) components, wherein the dispersity between the (B) component and the (F) component is 90 to 100: An anti-vibration rubber composition characterized by being in the range of%.
(A) Natural rubber or blend rubber of natural rubber and diene synthetic rubber.
(B) Zinc monomethacrylate.
(C) A thiazole vulcanization accelerator.
(D) A thiuram vulcanization accelerator.
(E) Sulfur-based vulcanizing agent.
(F) Carbon black.   The anti-vibration rubber composition according to claim 1, wherein the component (C) is dibenzothiazyl disulfide and the component (D) is tetramethylthiuram disulfide. The antivibration according to claim 1 or 2, wherein the content of the zinc monomethacrylate of the component (B) is set in the range of 0.5 to 10 parts by weight with respect to 100 parts by weight of the rubber of the component (A). Rubber composition.   A method for producing a vibration-proof rubber composition according to any one of claims 1 to 3, wherein zinc monomethacrylate (B) is added to a part or all of the rubber (A), and batch. A method for producing a vibration-insulating rubber composition, wherein the polymer batch obtained by the treatment is kneaded with component materials other than the component (B) in the vibration-insulating rubber composition after the treatment.   A vulcanized body of the vibration-proof rubber composition according to any one of claims 1 to 3.