JP2001240702A - Vibrationproof rubber composition and vibrationproof rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibrationproof rubber composition which gives a vibrationproof rubber having a low dynamic-to-static modulus ratio and a high damping factor and excellent in vibrationproof properties and durability and a vibrationproof rubber prepared by using the same and improved in vibrationproof properties and durability. SOLUTION: This vibrationproof rubber composition is prepared by compounding 100 pts.wt. rubber component mainly comprising 50-90 pts.wt. natural rubber and 50-10 pts.wt. styrene-butadiene rubber of which the content of vinyl groups in butadiene sections is 45 wt.% or higher with 2.5-5.0 pts.wt. sulfur and a carbon black having an iodine adsorption of 20-50 mg/g. This composition is used for preparing the vibrationproof rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vibration-proof rubber composition. In particular, the present invention relates to an anti-vibration rubber composition and an anti-vibration rubber mainly composed of natural rubber for an anti-vibration rubber for an automobile such as an engine mount of an automobile.

[0002]

2. Description of the Related Art In general, a vibration damping rubber is used for a mounting material such as an engine mount of an automobile or a vehicle, a bushing material, a damper material and the like in order to absorb vibration and prevent noise.

In order to improve the vibration-proof performance of the vibration-proof rubber, as a characteristic of the vibration-proof rubber, a value of a dynamic magnification ([dynamic spring constant] / [static spring constant]) is sufficiently small. In addition, it is necessary that the damping coefficient be sufficiently large.
The smaller the dynamic magnification is in the high frequency / low amplitude region, and the larger the damping coefficient is in the low frequency / high amplitude region, the better the vibration isolation performance is. At the same time, the vibration damping rubber must have toughness (resistance to deformation and destruction) and durability that can withstand severe use conditions.

Conventionally, a natural rubber-based polymer material (hereinafter, referred to as "NR-based material") has been generally used as the vibration-proof rubber. As the NR material, natural rubber (hereinafter referred to as N
R) or a blend rubber containing NR of 50 parts by weight or more is used. As the blended rubber, for example, a rubber in which a diene rubber such as styrene / butadiene rubber (hereinafter, referred to as SBR) is blended with NR is used.

[0005] The NR-based material is excellent in vibration-proof performance and resistance to repeated deformation because NR exhibits a lower dynamic magnification than other diene-based rubbers. Generally, the hardness required for the vibration-proof rubber is ensured by blending carbon black (hereinafter referred to as CB) as a reinforcing material.

[0006] When CB is blended with the vibration-isolating rubber, the hardness and the damping coefficient of the vibration-isolating rubber increase according to the compounding amount.
The dynamic magnification also increases due to the interaction between CB particles or between CB particles and rubber molecules.

[0007] That is, although the vibration reduction performance in the low frequency / high amplitude region is improved by increasing the attenuation coefficient,
Since the dynamic magnification also increases, the anti-vibration performance in the high-frequency / low-amplitude region is reduced, and there has been a problem that the anti-vibration performance as a whole including the low-frequency and high-frequency regions is not improved.

[0008] In addition to the above-described vibration-proof performance, severe conditions of use such as higher output of engine and FF, longer life of the vehicle, and sophistication and diversification of vibration-proof rubber due to pursuit of vibration-proof performance have been developed. Due to the improvement of the vibration isolating rubber structure, the demand for improving the durability of the vibration isolating rubber has become more severe.

As described above, it is difficult to achieve both the vibration isolation performance in the low-frequency / high-amplitude region and the vibration isolation performance in the high-frequency / low-amplitude region. It is desired to provide an anti-vibration rubber which has excellent durability performance.

[0010]

In order to solve such a problem, we have already proposed an anti-vibration rubber composition characterized by blending a specific amount of a terminally modified SBR with NR in a certain amount (Japanese Patent Application No. Hei. 11-152311). The anti-vibration rubber obtained by vulcanizing such an anti-vibration rubber composition has a high damping coefficient while maintaining the same level of dynamic magnification as a conventional anti-vibration rubber, and has the characteristics required by automobile manufacturers. Although it satisfies, in order to further improve the characteristics of cars in the future,
Further improvement in vibration isolation performance and durability is desired.

Therefore, in the present invention, the dynamic vibration ratio is maintained at the same level as that of the conventional anti-vibration rubber, and a higher damping coefficient is provided, so that the overall anti-vibration performance is excellent, and the toughness and durability are further improved. An object is to provide an excellent vibration-proof rubber composition.

[0012]

Means for Solving the Problems In order to achieve the above object, the present inventors have conducted intensive studies and as a result, have found that N
R, and a blended rubber comprising SBR containing a certain weight% or more of vinyl group, and as a reinforcing material, a C having an iodine adsorption amount (hereinafter referred to as IA) within a specific range.
By vulcanizing the rubber composition using B with a specific amount of sulfur,
It has been found that the damping coefficient can be increased while maintaining the same dynamic magnification as that of the vibration-isolating rubber using only NR as the rubber component. BR), a method of reducing the amount of NR dust to a certain value or less,
Alternatively, by adding a specific amount of a dispersant and triethanolamine (hereinafter referred to as TEA), the fatigue life of the vibration-isolating rubber composition can be significantly improved, and the durability life of the vibration-isolating rubber can be greatly improved. The inventors have found and completed the present invention.

[0013] That is, the invention of claim 1 provides a natural rubber 5
0 to 90 parts by weight, and a styrene-butadiene rubber having a vinyl group content in the butadiene part of 45% by weight or more.
2.5 to 5 parts by weight of sulfur and 20 to 5 parts by weight of iodine adsorbed to 100 parts by weight of a rubber component mainly containing 10 parts by weight.
An anti-vibration rubber composition comprising 50 mg / g of carbon black.

The invention of claim 2 is characterized in that 20 to 89 parts by weight of natural rubber, 50 to 10 parts by weight of styrene / butadiene rubber having a vinyl group content of 45% by weight or more in butadiene part, and 30 to 1 part by weight of butadiene rubber. A rubber composition comprising 2.5 to 5 parts by weight of sulfur and carbon black having an iodine adsorption amount of 20 to 50 mg / g with respect to 100 parts by weight of a rubber component consisting of .

According to a third aspect of the present invention, there is provided an anti-vibration rubber composition according to the first or second aspect, wherein the natural rubber has a dust amount of 0.06% by weight or less.

The invention according to claim 4 is characterized in that 0.5 to 5 parts by weight of a dispersant and 0.1 to 1 part by weight of triethanolamine are blended with 100 parts by weight of the rubber component. An anti-vibration rubber composition according to any one of claims 1 to 3.

According to a fifth aspect of the present invention, there is provided an anti-vibration rubber comprising the anti-vibration rubber composition according to any one of the first to fourth aspects.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the invention of claim 1, the SB
Due to the presence of the vinyl group in R, the dispersibility of NR and SBR and the dispersibility of rubber components (NR and SBR) and CB are improved,
An anti-vibration rubber having excellent damping properties can be obtained. From this viewpoint, the content of the vinyl group is 45% by weight or more, more preferably 50% by weight or more, and further preferably 60% by weight or more. In addition, the vinyl group content here means SB
R means the weight percentage of vinyl groups based on the weight of the butadiene-derived part excluding the styrene-derived part

The amount of the vinyl group-rich SBR in the rubber component of the present invention is at least 10 parts by weight, preferably at least 15 parts by weight, from the viewpoint of improving damping, and from the viewpoint of maintaining toughness (tensile strength). It is at most 50 parts by weight, preferably at most 45 parts by weight. That is, as the rubber component in the present invention, a blend rubber containing 50 to 90 parts by weight of NR and 50 to 10 parts by weight of the above-mentioned SBR having a high vinyl group content is used. This is because this combination is preferable in order to maintain toughness and improve damping. Furthermore, NR55
It is more preferable to use a blend rubber in which 85 parts by weight and 45 to 15 parts by weight of a high vinyl content SBR are compounded.

That is, as the rubber component, N
By using R in combination with the vinyl group-rich SBR, the dispersion stability of CB in the rubber is improved,
The interaction such as van der Waals force between the rubber molecules and the CB particles is improved, and the internal friction is reduced. As a result, the dynamic spring constant is reduced.

As the CB, those having an IA defined by JIS K6221 of 20 to 50 mg / g are used.
IA is a value used as an index of the specific surface area. The smaller this value is, the larger the CB particle size is.

In the present invention, if IA is less than 20 mg / g, a sufficient reinforcing effect cannot be obtained, and IA is 50 mg / g.
If it becomes larger, the cohesive force of the CB increases, and the dynamic magnification again increases.

The blending amount of CB cannot be specified unconditionally because it is blended so as to satisfy the hardness required for the vibration-proof rubber, but is usually about 15 to 80 parts by weight with respect to 100 parts by weight of rubber. .

By vulcanizing the rubber composition described above with a predetermined amount of sulfur, it is possible to increase the damping coefficient while maintaining a low dynamic magnification. Sulfur is
2.5 to 5 parts by weight is added to 100 parts by weight of the rubber component. If the amount is less than 2.5 parts by weight,
The effect of improving the dynamic spring constant is small, so that a low dynamic magnification cannot be maintained. If it exceeds 5 parts by weight, the crosslink density becomes too high, and the toughness (tensile strength) and durability (low compression set) are reduced. descend.

According to the second aspect of the present invention, NR20
-89 parts by weight; 50-10 parts by weight of SBR having a vinyl group content of 45% by weight or more in a butadiene part;
A vibration-proof rubber composition containing 0 to 1 part by weight of a rubber component,
By blending BR having high elasticity, low heat generation and excellent dynamic characteristics, it is possible to obtain an anti-vibration rubber composition having excellent durability without impairing the anti-vibration performance. In particular, as BR, cis-1,
BR containing 90% of four bonds is preferred because it has a large effect of improving durability.

When the amount of BR is 1 part by weight or more, the effect is exhibited and the durability is improved with the added amount. However, when it exceeds 30 parts by weight, the toughness is reduced and the processability of the rubber composition is also reduced. It is not preferable. Further, BR having a small cis bond content is not preferred because trans-1,4 bonds increase and rubber elastic modulus decreases.

[0027] Also in the vibration-isolating rubber composition containing this BR, 2.5 to 5 sulfur per 100 parts by weight of the rubber component is used.
By blending parts by weight and carbon black having an iodine adsorption amount of 20 to 50 mg / g, durability can be improved while maintaining low dynamic magnification and high attenuation.

The NR used for the NR material is 0.08 to 0.2, which is an average amount of dust of a ribbed smoked sheet (RSS No. 1 to 6) used for ordinary rubber products. By replacing the NR with the NR having a dust amount of 0.06% by weight or less, the durability can be greatly improved.

This is because dust such as wood chips derived from the production of NR is present in the rubber composition, thereby causing initiation of cracks due to fatigue, or dust becoming impurities to promote heat generation of the rubber composition. Thing,
The durability is improved by removing dust that causes a decrease in fatigue resistance. Therefore, in this case, it is a preferable embodiment to replace the entire amount of NR.

The amount of dust in the NR is determined according to JIS K6352.
It is measured by the method specified in.

Further, based on 100 parts by weight of the rubber component, 0.5 to 5 parts by weight of a dispersant and 0.1 to 1 part of TEA are used.
By blending parts by weight, the durability of the rubber cushion composition can be improved.

The dispersant generally includes various fatty acids, metal salts of fatty acids, fatty acid esters and the like. Examples thereof include stearic acid, polyvinyl alcohol, carboxymethylcellulose, and various surfactants. In particular, in the present invention, an aliphatic synthetic resin mixture which is a mixture of a special fatty acid, an amine and an inorganic filler is effective.

Further, TEA promotes a vulcanization reaction between the rubber component and CB, and has an effect of preventing a delay in vulcanization.
By strengthening the bond between the rubber and the CB, the reinforcing properties of the CB can be improved.

Therefore, the dispersion effect of CB by the dispersant and the reinforcement effect by TEA have a synergistic effect, and the durability of the vibration-proof rubber composition can be improved.

The amount of the dispersant is less than 0.5 parts by weight,
When the content of TEA is less than 0.1 part by weight, the above synergistic effect is not exerted. When the content is more than 5 parts by weight and 1 part by weight, no further improvement in the effect is observed.
If the amount is more than the weight part, scorch is apt to occur, and the rubber processability is undesirably reduced.

The antioxidant to be compounded in the vibration-proof rubber composition of the present invention can improve the durability by combining 1 to 5 parts by weight of two or more antioxidants. .

The anti-vibration rubber causes aging due to many factors such as external factors such as mechanical fatigue, heat and oxygen, and internal factors such as the effect of rubber type, degree of vulcanization, and type of vulcanization accelerator. Since the phenomenon occurs, by selecting and using an anti-aging agent capable of coping with each factor, the aging phenomenon of the vibration-proof rubber composition can be suppressed, and the durability can be improved.

The antioxidant is not particularly limited,
Amine-ketones, aromatic secondary amines, phenols, imidazoles and the like can be mentioned, and two or more of them can be used in combination. If the total amount is less than 1 part by weight, the effect of preventing aging can be obtained. If the amount exceeds 5 parts by weight, the effect on the vulcanization characteristics is undesirably increased.

Various compounding agents for a vibration-proof rubber, such as a softener, a plasticizer, a vulcanization accelerator, and a filler, are appropriately blended with the above-mentioned vibration-proof rubber composition according to the use and required performance.

The above-mentioned vibration-proof rubber composition is molded according to a conventional method.
It can be vulcanized to produce various automotive and vehicle anti-vibration rubber products such as engine mounts, torsional dampers, strut mounts, etc. The anti-vibration rubber has both excellent anti-vibration performance and durability. It can respond to the sophistication of anti-vibration rubber and diversified required performance and functions.

Further, the vibration-proof rubber composition can be used for ships, bridges,
Of course, the present invention can be applied to other anti-vibration rubber products such as anti-vibration rubber for buildings and anti-vibration rubber.

(Examples) Hereinafter, the anti-vibration rubber composition according to the present invention will be described in detail with reference to examples.

[Examples and Comparative Examples] Table 1 shows the amount of NR dust (NR-1 is equivalent to RSS # 3) used in the anti-vibration rubber compositions of Examples and Comparative Examples. Table 2 shows the group content and styrene content, and Table 3 shows the IA of CB. Butadiene rubber (BR) is cis-
BR01 manufactured by JSR Corporation having a 1,4 bond content of 96% by weight was used.

[0044]

[Table 1] The amount of NR dust is measured according to the method described in JIS K6352.

[0045]

[Table 2]

[Table 3] The common compounding agents used for each of the rubber components and the anti-vibration rubber compositions other than CB shown in Tables 1 to 3 are as follows. Zinc flower: 3 parts by weight Stearic acid: 1 part by weight Microcrystalline WAX: 2 parts by weight Antioxidant (Nocrack 6C and Nocrack 224, each 2 parts by weight): 4 parts by weight Aroma oil: 5 parts by weight Vulcanization accelerator (Noxeller) (TT-P, 0.3 parts by weight and Noxeller NS-P, 1.5 parts by weight): 1.8 parts by weight A rubber component, CB, sulfur and a dispersant blended in the anti-vibration rubber compositions of Examples and Comparative Examples. Tables 4 to 9 show the amounts (parts by weight) of TEA and TEA and their evaluation results. The dispersant is an aliphatic synthetic resin mixture (SCHILL & S, Germany)
(STRUKTOL 60NS manufactured by EILACHER)
It was used.

[Preparation of Samples and Characteristic Tests] Each compounding agent shown in Tables 4 to 9 was mixed by a conventional method using a closed type Banbury mixer having a capacity of 1.7 liters to prepare respective vibration-proof rubber compositions.

Each of the prepared vibration-isolating rubber compositions was molded by vulcanization at 160 ° C. for 20 minutes using a mold for preparing each sample to prepare a sample.

A cylindrical test piece having a diameter of 8 mm and a height of 4 mm was prepared from each of the obtained rubber compositions under the above molding conditions.
A dynamic spring constant (KdlOO) at 25 ° C. and 100 Hz compression and a damping coefficient (C15) at 15 Hz were determined by a viscoelasticity measuring device (Rheograph Solid manufactured by Toyo Seiki Seisaku-sho, Ltd.). For the test piece, a static spring constant (Ks) in the compression direction was measured using a strograph R manufactured by Toyo Seiki Seisaku-Sho, Ltd., and a dynamic magnification (Kdl) was calculated from these values.
OO / Ks) was calculated. These measurements were made by JI
Performed according to SK6385.

Further, a sheet having a thickness of 2 mm was obtained from each rubber composition under the above-mentioned molding conditions, and a test piece for tensile properties (1
No. dumbbell), and the tensile strength (TB) was measured in accordance with JIS K6251.

Further, a cylindrical test piece for compression set having a thickness of 12.5 mm and a diameter of 29 mm was prepared from each rubber composition under the above-mentioned molding conditions, and the compression set (CS) was determined in accordance with JIS K6262. Was measured. The processing conditions were 80 ° C. × 250 hours.

The durability of the vibration-isolating rubber was evaluated by making a strut mount shown in FIG. 1 using each of the rubber compositions shown in Tables 7 to 9 by a conventional method, and using a commercially available vibration tester at room temperature. A constant load of + 8500N to -6900N was applied to the mount at a frequency of 2 Hz, and the number of vibrations until breakage occurred in the mount was measured.

[Evaluation Results] The evaluation results of the above characteristic tests were
The results are shown in Tables 4-9. In the table, the dynamic magnification and damping coefficient are N
The dynamic magnification and attenuation coefficient of Comparative Example 1 in which R-1 alone was blended were 100.
The dynamic magnification is maintained at 100, and the larger the value of the damping coefficient, the better. The durability is NR-1.
Example 5 which is a blend of SBR-E and SBR-E is indicated by an index of 100, and the larger the value, the better.

The target characteristic values were a tensile strength (TB) of 18 MPa or more and a compression set (CS) of 65 or less.

[0054]

[Table 4]

[Table 5]

[Table 6]

[Table 7]

[Table 8]

[Table 9] Influence of SBR Table 4 shows NR-1 and SBR-A to E as rubber components.
It is the result of evaluating the characteristics of the vibration damping rubber when the type (vinyl group content, styrene content) and the compounding amount were changed.

As shown in Table 4, Examples 1 to 3 using an appropriate amount of SBR-B and Examples 4 and S using an appropriate amount of SBR-C were used.
In Example 5 using an appropriate amount of BR-E, the dynamic magnification was set to 10
Since the damping coefficient is increased while maintaining the value at 0 to 110, it is understood that the vibration isolation performance is improved. Furthermore, all of the other characteristic values have achieved the target values, indicating that the rubber has excellent performance as an anti-vibration rubber.

On the other hand, Comparative Examples 2 and 3 are SBR-A having a low vinyl group content, so that the increase in the attenuation coefficient is small. Comparative Example 4 is a predetermined SBR-C, but the amount is too small to increase the attenuation coefficient, and Comparative Example 5 is a predetermined SBR-B but too large toughness (tensile strength). Decrease. In Comparative Example 6, since the SBR-D is out of the predetermined range and the amount used is small, the increase in the attenuation coefficient is small and the dynamic magnification is large.

Influence of CB Table 5 shows the results of evaluation of the properties of the vibration damping rubber when the types and amounts of CB-1 to CB-4 were changed. The rubber component was evaluated by fixing the amounts of NR-1 and SBR-C to 70 parts by weight and 30 parts by weight, respectively, and fixing the amount of sulfur to 2.7 parts by weight.

As shown in Table 5, CB- with IA within a predetermined range was obtained.
In Examples 4 and 6 using CB-1 and CB-2, the target values were achieved in all the characteristics including the anti-vibration performance.

On the other hand, when IA is larger than 50 mg / g,
In Comparative Example 7 using B-3, the dynamic magnification increases to 110 or more, and in Comparative Example 7 using CB-4 having an IA of less than 20 mg / g, toughness (tensile strength) decreases.

Influence of Sulfur Content Table 6 shows the evaluation of the characteristics of the vibration damping rubber when the amount of sulfur relative to the rubber component was changed. As the rubber component, the compounding amounts of NR-1 and SBR-C were fixed to 70 parts by weight and 30 parts by weight, respectively, and CB was 30 mg as CB.
/ G of CB-1 was evaluated.

From Table 6, it can be seen that Examples 4 and 7, in which an appropriate amount of sulfur was blended, achieved the target values in all the characteristics including the anti-vibration performance.

On the other hand, in Comparative Example 9 in which the amount of sulfur was less than 2.5 parts by weight, the dynamic magnification was increased, and in Comparative Example 10 in which the amount of sulfur was more than 5 parts by weight, toughness (tensile strength,
Shrinkage permanent set) is reduced.

Influence of butadiene rubber (BR) Table 7 shows the results of evaluating the characteristics of the vibration damping rubber when the amount of BR was changed. The rubber component was prepared by changing the amount of NR-1 to 20 parts by weight of SBR-E, compounding 52 parts by weight of CB-1 and 3 parts by weight of sulfur. The evaluation was performed based on Example 5.

From Table 7, it can be seen that Comparative Example 11 having a large BR content improves the durability, but has a large decrease in the tensile strength.
In Examples 8 and 9 in which the compounding amount is appropriate, the durability is improved together with the added amount, and the durability and the anti-vibration properties are satisfied.

Influence of Natural Rubber (NR) Dust Amount Table 8 shows the results of evaluating the characteristics of the vibration damping rubber when the amount of the NR dust was adjusted, in which the entire amount of the NR was replaced. If a part of the NR is replaced with a small amount of dust, the dust is dispersed throughout the rubber composition by mixing, so that the effect of improving the durability cannot be greatly expected.

The tenth embodiment uses NR-2 having a dust amount of 0.08% by weight or less, but does not show any improvement in durability as compared with the fifth embodiment. On the other hand, the amount of waste is reduced to 0.
Example 11 using NR-3 restricted to not more than 05% by weight
Can maintain anti-vibration performance and greatly improve durability.

Dispersant and Triethanolamine (TEA)
Table 9 shows the evaluation of the characteristics of the vibration-isolating rubber when the amounts of the dispersant and TEA with respect to the rubber component were changed.

From Table 9, it can be seen that Example 20 in which an appropriate amount of a dispersant and TEA were blended had satisfactory anti-vibration performance and improved durability. Example 1 in which a large amount of both a dispersant and TEA were blended
No. 5 has improved durability, but has a shorter scorch time t5 and is more easily scorched, resulting in poor workability.

A rubber composition in which one or both of the dispersant and TEA are not in the proper range can substantially maintain the vibration-proof performance, but cannot sufficiently improve the durability. Examples 13 and 1 in which the amount of TEA exceeds 1 part by weight
In No. 7, t5 becomes faster and scorch becomes easier. Note that t5
Is determined according to JIS K6300.

As is evident from the above results, a vibration-proof rubber composition having excellent vibration-proof performance, toughness and durability by blending each of SBR, CB and sulfur having a certain amount or more in appropriate amounts. Can be obtained, and furthermore, BR blending, NR waste reduction, dispersant and T
By blending EA or the like, the vibration isolation performance can be maintained at a high level, and the durability can be further improved.

[0071]

As is apparent from the above description, according to the present invention, a styrene / butadiene rubber containing 50 to 90 parts by weight of a natural rubber and a vinyl group having a vinyl group content of 45% by weight or more in a butadiene part. For 100 parts by weight of the rubber component consisting of 50 to 10 parts by weight, sulfur 2.5 to
By blending 5 parts by weight with carbon black having an iodine adsorption amount of 20 to 50 mg / g, it is possible to increase the damping coefficient while maintaining a low level of dynamic magnification, and achieve excellent vibration isolation performance. Obtainable. In addition, by mixing butadiene rubber, reducing the amount of waste of natural rubber, and properly mixing a dispersant and triethanolamine, the anti-vibration performance can be maintained and the durability can be further improved.

As a result, an anti-vibration rubber composition having excellent anti-vibration performance, toughness and durability can be obtained. The anti-vibration rubber using this anti-vibration rubber composition has excellent anti-vibration performance and durability. It has an excellent effect that can satisfy market requirements.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a strut mount using a vibration-proof rubber composition of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Strut mount 2 ... Vibration-proof rubber composition 3 ... Inner connection member 4 ... Outer fitting

──────────────────────────────────────────────────の 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 // (C08L 7/00 (C08L 7/00 9:06) 9:06) (72) Inventor Tatsuya Sugihashi 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. (72) Shogo Nakanishi Edobori, Nishi-ku, Osaka-shi, Osaka 1-17-18 Toyo Tire & Rubber Co., Ltd.

Claims (5)

[Claims] 1. A rubber component containing 50 to 90 parts by weight of a natural rubber and 50 to 10 parts by weight of a styrene / butadiene rubber having a vinyl group content of 45% by weight or more in a butadiene part, based on 100 parts by weight of a rubber component. And 2.5 to 5 parts by weight of sulfur and carbon black having an iodine adsorption amount of 20 to 50 mg / g. 2. A rubber component comprising 20 to 89 parts by weight of a natural rubber, 50 to 10 parts by weight of a styrene-butadiene rubber having a vinyl group content of 45% by weight or more in a butadiene part, and 30 to 1 part by weight of a butadiene rubber. 2.5 to 5 parts by weight of sulfur and 100 to 100 parts by weight of iodine
An anti-vibration rubber composition comprising 50 mg / g of carbon black. 3. The vibration-proof rubber composition according to claim 1, wherein the natural rubber has a dust amount of 0.06% by weight or less. 4. The composition according to claim 1, wherein 0.5 to 5 parts by weight of a dispersant and 0.1 to 1 part by weight of triethanolamine are blended with 100 parts by weight of the rubber component.
An anti-vibration rubber composition according to any one of claims 1 to 3. 5. An anti-vibration rubber comprising the anti-vibration rubber composition according to any one of claims 1 to 4.