JP3526045B2 - Anti-vibration rubber composition and anti-vibration rubber - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition capable of suppressing an abnormal sound generated in a vibration-proof rubber portion used in contact with a metal part, and a vibration-proof rubber using the composition. Regarding More specifically, the present invention relates to a vibration-proof rubber composition and a vibration-proof rubber suitable for applications such as stabilizer bushes and suspension bushes for vehicles such as automobiles that are prone to generate abnormal sounds due to stick-slip phenomenon.

[0002]

2. Description of the Related Art Among vibration damping rubbers for automobiles, metal parts (stabilizer bars) such as stabilizer bushes.
With the anti-vibration rubber that is used by fitting in, when the vehicle starts, suddenly brakes, or turns left or right, the contact force between the stabilizer bar and the inner surface of the stabilizer bush is subject to rotational force or spring force, which causes stick-slip phenomenon. Noise is likely to occur, and countermeasures against it are required.

As measures against this, various methods for reducing the friction coefficient of the rubber surface have been studied. For example, a method of adding a wax to a rubber component, a method of using a wax and a certain fatty acid amide together, a method of adding a liquid silicone oil, etc. have been proposed. The method of adding wax is insufficient in the effect of reducing the friction coefficient, the effect does not last long, and even if low friction resistance is achieved by using some fatty acid amide together, a very narrow temperature range around room temperature Only the friction reducing effect can be obtained, and the friction reducing effect is insufficient at a low temperature or a high temperature. Further, the method of adding silicone oil has an excellent effect in reducing the coefficient of friction, but silicone oil has poor compatibility with rubber components, remarkably poor kneading processability, and is difficult to mass-produce. Have

Therefore, when the unsaturated fatty acid amide is blended in the rubber component, the present inventors act as a self-lubricating agent by which these components gradually exude (bloom) to the rubber surface,
It was confirmed that the friction coefficient can be significantly reduced over a wide temperature range and that unsaturated fatty acid amides have good compatibility with rubber components and excellent workability, and the above problems have been solved. A composition and an anti-vibration rubber have been proposed (JP-A-6-234886).

However, the anti-vibration rubber containing the above unsaturated fatty acid amide has not been sufficiently satisfactory in terms of the effect of reducing friction. That is, when the anti-vibration rubber is rubbed against the metal counterpart, local heat generation or an oxidation reaction occurs, and low-molecular-weight adhesive wear powder is generated on the rubber surface. The coefficient of friction is high. In areas with heavy wear such as stabilizer bushes, unsaturated fatty acid amides blooming on the rubber surface due to wear are scraped off by the stabilizer bar, and water and dust enter from the outside between the bush and the bar, further It was easily scraped off, the formation of the lubricant layer due to the bloom of the lubricant was not in time, and the effect of reducing the friction that was initially seen deteriorated with time, causing abnormal noise.

Therefore, the object of the present invention is to suppress the generation of adhesive wear powder due to abrasion of the rubber surface, which causes an increase in the friction coefficient, and to be commensurate with the amount consumed from the rubber surface with high abrasion that is encountered in practice. An object of the present invention is to provide an anti-vibration rubber composition and an anti-vibration rubber in which a self-lubricating agent (unsaturated fatty acid amide) can bloom on the surface from the inside at a high speed.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that when a butadiene rubber component is added as a rubber component in a larger amount than before, the production of tacky abrasion powder due to abrasion of the rubber surface is suppressed. Moreover, it has been found that the bloom speed of the lubricant is improved and the friction reducing effect is maintained for a long period of time even when the lubricant is used on a portion such as a stabilizer bush where the degree of wear is high.

In the conventional self-lubricating anti-vibration rubber composition, natural rubber having excellent processability and mechanical properties is used as a rubber component. However, natural rubber easily produces sticky wear powder due to heat due to friction, etc., and the bloom speed of the lubricant component is slow, so the effect of friction reduction gradually when used on parts with high wear such as stabilizer bushes. Fall to.

It should be noted that butadiene rubber is generally blended in the rubber component in order to improve the impact resilience, but when it is used in a heavily worn portion such as a stabilizer bush, the durability and strength decrease. So
The compounding amount is used up to about 40% by weight.

However, the present inventors have found that when a large amount of butadiene rubber is blended in a self-lubricating anti-vibration rubber composition, when worn, the surface of the worn rubber itself is tacky, unlike other rubbers. The present invention has been completed by confirming that the effect of reducing the friction coefficient immediately after abrasion is maintained for a long period of time, and that durability and strength do not decrease to a level that causes practical problems.

That is, the present invention provides the following anti-vibration rubber composition and anti-vibration rubber using the same. (1) A vibration-proof rubber composition comprising a vulcanizing agent and an unsaturated fatty acid amide in a rubber component containing butadiene rubber in an amount of 78% by weight or more (excluding the case where butadiene rubber is 100% by weight). (2) The vibration-insulating rubber composition as described in 1 above, wherein the content of the unsaturated fatty acid amide is 10 to 50 parts by weight based on 100 parts by weight of the rubber component. (3) Crosslink density is 2.9 × 10 ^{4 to} 7.0 × 10 ⁴ mol / cm
^3. The vibration-insulating rubber composition as described in 1 or 2, which is ³ . (4) The vibration-insulating rubber composition according to any one of claims 1 to 3, wherein the unsaturated fatty acid amide has a Bloom film thickness growth of 25 µm or more after standing at 40 ° C for 6 days. (5) An anti-vibration rubber comprising the anti-vibration rubber composition described in 1 to 4 above. (6) The vibration-proof rubber as described in 5 above, which is for a stabilizer bush. Hereinafter, the anti-vibration rubber composition and anti-vibration rubber of the present invention will be described in detail.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION (1) Rubber Component In the present invention, a mixed rubber containing 78% by weight or more, preferably 80% by weight or more (excluding 100% by weight) of butadiene rubber is used as a base rubber. The compounding amount of butadiene rubber is 78
If it is less than 10% by weight, when it is subjected to frictional wear, local heat generation or oxidation reaction occurs, low-molecular-weight adhesive wear powder is generated, and the friction coefficient rises, and when applied to stabilizer bushes etc., it may differ due to stick-slip phenomenon. Sound is generated. Further, the bloom speed of the unsaturated fatty acid amide, which is a self-lubricating component, becomes insufficient, and the friction coefficient increases over time due to abrasion, which causes abnormal noise. Examples of rubber components other than butadiene rubber (BR) include synthetic rubbers such as natural rubber (NR) and styrene butadiene rubber (SBR). Butadiene rubber-
Natural rubber (BR-NR), butadiene-styrene butadiene rubber (BR-SBR), butadiene rubber-natural rubber-styrene butadiene rubber (BR-NR-SBR), etc. are mentioned.

(2) Vulcanizing agent In the present invention, any vulcanizing agent generally used can be used. Specific examples thereof include sulfur, morpholine disulfide, tetramethylthiuram disulfide and the like, and sulfur is preferable. The amount of sulfur is 100 for the rubber component.
It is about 2 to 8 parts by weight with respect to parts by weight.

(3) Self-lubricating agent In the present invention, an unsaturated fatty acid amide is contained as a self-lubricating agent in the rubber component. The unsaturated fatty acid amide that can be used in the present invention has the general formula RCONH ₂ (wherein
R represents an unsaturated fatty acid alkylene group. ), And those having a molecular weight of 250 to 350 and a melting point of 90 ° C. or less are preferable. If the melting point is higher than 90 ° C, the effect of reducing friction in a low temperature atmosphere becomes insufficient, and the molecular weight becomes high and the bloom speed becomes slow. Specific examples thereof include oleic acid amide and erucic acid amide. These lubricant components can be used alone or in combination of two or more. The compounding amount of the above-mentioned lubricant component is the rubber component 10
An amount of 10 to 50 parts by weight, particularly 15 to 25 parts by weight, based on 0 parts by weight is preferable. If the amount of unsaturated fatty acid amide is less than 10 parts by weight, the effect of reducing friction is insufficient,
If it exceeds 50 parts by weight, the mechanical properties of the rubber will deteriorate.

(4) Additives In addition to the above-mentioned essential components, the anti-vibration rubber composition of the present invention contains a vulcanization accelerator, a reinforcing material, a vulcanization aid, which has been used as an additive for rubber. A softening agent, a processing aid, an antiaging agent, a filler and the like can be added.

The vulcanization accelerator is an additive for suppressing radical cleavage of the rubber polymer and improving the crosslinking effect,
About 0.5 to 5 parts by weight can be used per 100 parts by weight of the rubber component. Examples of vulcanization accelerators include N-cyclohexyl-2-benzothiazole sulfenamide, N-
Sulfenamide compounds such as oxydiethylene-2-benzothiazole sulfenamide and N, N-diisopropyl-2-benzothiazole sulfenamide; 2-
Mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,6
-Diethyl-4-morpholinothio) benzothiazole,
Thiazole compounds such as dibenzothiazyl disulfide; guanidine compounds such as diphenylguanidine, dioltotolylguanidine, triphenylguanidine, orthotolylbiguanide, diphenylguanidine phthalate; acetaldehyde-aniline reaction product, butyraldehyde-aniline condensate, hexamethylene Aldehyde-amine or aldehyde-ammonia compounds such as tetramine, acetaldehyde-ammonia reaction product; 2
-Imidazoline compounds such as mercaptoimidazoline;
Thiourea compounds such as thiacarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diortotolylthiourea; tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide, etc. Dithiocarbamate such as zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc dibutylthiocarbamate, zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, selenium dimethyldithiocarbamate, tellurium diethyldithiocarbamate, etc. Acid salt-based compounds; Xanthate-based compounds such as zinc dibutylxanthate It compounds such things like.

Examples of the reinforcing material used to enhance the mechanical properties (tensile strength, hardness, tear strength, abrasion resistance, etc.) of the vulcanized product include carbon black and silica.
The blending amount cannot be specified unconditionally, but is generally about 10 to 150 parts by weight with respect to 100 parts by weight of the rubber component.

Examples of the vulcanization aid include metal oxides such as zinc white (ZnO), which are used to trap hydrogen sulfide generated during vulcanization (remove it from the reaction system) and accelerate the vulcanization reaction. . The compounding amount thereof is generally 3 to 15 parts by weight with respect to 100 parts by weight of the rubber component.

As the softening agent, process oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt,
Petroleum softeners such as petrolatum; Fat oil softeners such as castor oil, linseed oil, rapeseed oil, coconut oil; tall oil; sub; waxes such as beeswax, carnauba wax, lanolin; linoleic acid, palmitic acid, stearin Acid, lauric acid, etc. are used, and they are used up to about 40 parts by weight with respect to 100 parts by weight of the rubber component.

Fatty acids such as stearic acid may be mentioned as processing aids which serve as lubricants for the added inorganic substances and the rubber component. The compounding amount is about 0.5 to 5 parts by weight with respect to 100 parts by weight of the rubber component.

Examples of the antiaging agent (deterioration inhibitor) include amine-based, phenol-based, imidazole-based, metal carbamic acid salts, waxes, etc., and are mixed in an amount of 0.5 to 8 parts by weight per 100 parts by weight of the rubber component. be able to.

Examples of the filler include calcium carbonate, clay, talc and the like, in addition to the above-mentioned reinforcing material, and can be added up to about 150 parts by weight with respect to 100 parts by weight of the rubber component. In addition to the above additives, conventionally known conventional compounding agents may be used.

(5) Crosslinking Density In the present invention, in order to increase the bloom rate of the unsaturated fatty acid amide (self-lubricating agent), the above-mentioned rubber component, vulcanizing agent, self-lubricating agent and other additives are used to crosslink. Density 2.0
It is preferable to adjust the vulcanization so that the crosslinking density will be higher than that of the conventional anti-vibration rubber composition of about 10 ⁴ to 3.0 × 10 ⁴ mol / cm ³ . Specifically, crosslink density 2.9 × 10 ⁴ to 7.0 × 10
⁴ mol / cm ³ , preferably 4.0 × 10 ⁴ to 6.0 × 10 ⁴ mol / cm
It is preferable to adjust to ³ . Crosslink density (mol / cm
³ ) and, as described in detail in the section of Examples below, from the relationship between the compressive stress and strain measured for the molded rubber sample,
It means that obtained based on the Flory-Rehner equation below.

[0024]

[Equation 1]

The symbols in the equations are as follows. f: Compressive stress k: Boltzmann constant T: Absolute temperature υ: Crosslink density V ₀ : Volume of sample φ: Volume fraction of filler V ₀ ′: Volume of pure rubber polymer (V ₀ (1-φ)) A ₀ : Cross-sectional area of sample before swelling L ₀ : Height of sample before swelling L _S0 : Height of sample after swelling before compression L _S : Height of sample after swelling during compression α: Compressibility of sample (L _S / L _S0 )

When the crosslink density is within the above range, the blooming speed of the unsaturated fatty acid amide in the rubber composition is increased, and even when it is used in a portion such as a stabilizer bush having a high degree of wear, friction is reduced with time. The effect does not decrease. If the cross-linking density is low, the internal pressure of the rubber is low and the blooming speed of the unsaturated fatty acid amide is not sufficient, so that the friction reducing effect cannot be maintained when used in a site where the degree of wear is severe. Further, if the crosslink density becomes too high, the strength as a vibration isolating rubber will decrease. The adjustment of these crosslink densities can be usually carried out by the amount of the vulcanizing agent or vulcanization accelerator to be added. It can also be adjusted by the combined use of vulcanization aids or the amount used.

(6) Bloom film thickness growth rate In the present invention, the bloom film thickness growth of the unsaturated fatty acid amide after standing at 40 ° C. for 6 days is 25 μm or more, and further 3
It is preferably 5 μm or more. When the bloom film thickness growth rate is slow, the friction coefficient increases with time due to wear, and abnormal noise is likely to occur. The Bloom film thickness growth rate can be adjusted by the type of unsaturated fatty acid amide (preferably having a low molecular weight and low melting point), the blending amount of unsaturated fatty acid amide and the crosslinking density.

(7) Manufacturing Method The anti-vibration rubber composition of the present invention is manufactured, for example, as follows. That is, the masticated rubber component and other additives are uniformly mixed and then kneaded at a temperature not higher than the vulcanization temperature. Then, the unvulcanized rubber is vulcanized and molded at a temperature equal to or higher than the vulcanization temperature. The temperature during vulcanization and the vulcanization time may be appropriately set, but if the temperature is too high, the strength of the rubber tends to decrease due to vulcanization reversion, etc., and the blooming speed of the lubricant becomes slow due to the decrease in crosslink density, If the temperature is too low, vulcanization will not proceed sufficiently and the low crosslink density will also tend to reduce the lubricant bloom rate.

The anti-vibration rubber of the present invention obtained as described above is
It can be preferably used for a fit-in type bush such as a stabilizer bush, but it can also be used for other parts where metal and rubber are in contact with each other without being fixed by adhesion and a rotational force or a load is applied.

[0030]

The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following description. In each of the examples and comparative examples, the following materials were used as raw material rubbers and additives.

(1) Rubber component Natural rubber (NR). Butadiene rubber (BR). (2) Unsaturated fatty acid amide: oleic acid amide. (3) Carbon black: Furnace black (FE
F). (4) Vulcanizing agent: sulfur. (5) Vulcanization accelerator: N-cyclohexyl-2-benzobenzothiazolylsulfenamide (CZ: manufactured by Ouchi Shinko Chemical Co., Ltd.). (6) Vulcanization aid: Zinc white (ZnO). (7) Softening agent: naphthenic process oil. (8) Lubricant: stearic acid. (9) Anti-aging agent Amine anti-aging agent: 3C (manufactured by Seiko Chemical Co., Ltd.). Amine-ketone type anti-aging agent: RD (manufactured by Seiko Chemical Co., Ltd.).

Examples 1 to 4 and Comparative Examples 1 to 2 The above components were blended and kneaded in the proportions shown in Table 1 by a conventional method to prepare a vibration-proof rubber composition.

[0033]

[Table 1]

The compounded rubber composition obtained was molded and vulcanized by the following method to give normal properties (100% tensile stress M ₁₀₀ , breaking strength TB, breaking elongation EB and hardness HS), crosslink density, lubricant film. Thick, Williams wear test 15 minutes later to 60
The friction coefficient after the minute was measured, and the presence or absence of abnormal noise of the stabilizer bush after the durability test and the presence or absence of tackiness of the bush inner hole surface after the abnormal noise test were observed and evaluated. The results are shown in Table 2.

1) Normal-state properties A 2 mm thick sheet obtained by vulcanizing at 150 ° C. for 20 minutes was molded into a dumbbell mold (JIS K6301), and then the temperature was 25 ° C. and the pulling speed was 500 mm / min according to the method described in JIS K6301. Tensile test is performed under the conditions, 100% tensile stress M
₁₀₀ (MPa), breaking strength TB (MPa) and breaking elongation EB (%) were measured. Also for hardness HS, the spring hardness is set to JI according to the method described in JIS K6301.
It was measured with an SA hardness meter.

2) 1 mm thick rubber sheet produced by vulcanizing at a crosslink density of 150 ° C. for 20 minutes was Soxhlet extracted with acetone for 24 hours,
Vacuum dried for an hour. This sheet is 2mm x 2mm x 1m
After cutting to about m, the dimensions were precisely measured, and then immersed in a tetrahydrofuran / benzene (1/1) mixed solvent for 6 hours to be swollen. After accurately measuring the height of the sample after swelling, a thermomechanical analyzer (Thermomechanical A
nalyzer) (TA-50WS: manufactured by Shimadzu Corporation), the relationship between the compressive stress and the strain was obtained, and the crosslink density (mol / cm ³ ) was calculated based on the Flory-Rehner equation.

3) Lubricant A rubber sheet having a thickness of 2 mm obtained by vulcanizing at a film thickness of 150 ° C. for 20 minutes was cut into 40 mm × 10 mm, and the lubricant leached on the surface of the sheet was completely washed with an organic solvent (alcohol). It was wiped off, left at 40 ° C. for 6 days, immersed in liquid nitrogen, frozen, bent and broken. The fracture surface was observed with an electron microscope to measure the film thickness of the lubricant layer.

4) Williams abrasion test 15 to 60 minutes later, the rubber composition containing a friction coefficient was vulcanized at 150 ° C. for 20 minutes to prepare a sample for the Williams abrasion test (JIS K6264).
According to Method A of the constant load Williams abrasion test of 6264 (however, an iron plate is used as a polishing plate instead of a grindstone. Surface roughness of polishing plate: Rz 20 μm), after abrasion of the sample, 1 at room temperature
After standing for 5, 30, 45 and 60 minutes, the friction coefficient was measured by the tester shown in FIG. That is, when the rubber sample (1) is adhered to the movable table (2) and the movable table (2) is moved in the plane direction by 7 mm at a speed of 3 mm per second, it is fixed to a load cell (not shown) and is immovable. The possible force (F) applied to the contact surface of the mating member 3 was measured with a load cell. Here, the mating member 3 is made of stainless steel, the contact surface is 10 mm × 10 mm, and the surface roughness (Rmax) is 5 to 10
The thing with a micrometer was used. In addition, the mating material (3) is 100
A load of 4 g was placed. The friction coefficient μ is a μ value calculated by the formula F = μM. The coefficient of friction peak obtained first after starting to move is the coefficient of static friction (μs), then 7
The average value of the friction coefficient obtained during the movement of mm was defined as the dynamic friction coefficient (μk). Table 2 shows the static friction coefficient (μs) and dynamic friction coefficient (μk) after 15 minutes of the Williams wear test, and FIG. 2 shows the static friction coefficient (μs) after 15 to 60 minutes of the Williams wear test.

5) Stabilizer Bush Noise Test After Durability Test The vibration-proof rubber formed by vulcanization molding at 150 ° C. for 30 minutes was subjected to a noise test after the durability test by the tester shown in FIG. That is, a stabilizer bush (11) having a stabilizer bar (10) inserted therein is fixed to a test jig (13) with a mounting bracket (12) using a bolt (15) and a nut (16) to obtain a measurement sample. A load of 0 ± 100 kg is applied to the sample in the direction A perpendicular to the axis at 0.3 Hz, and a stabilizer bar (10) is placed in an angle range of 0 ± 15 degrees.
It is reciprocally oscillated in the circumferential direction at 2 Hz as shown by arrow B to apply a twisting force, and the test dust (JIS Z890) is applied to the contact portion between the stabilizer bar (10) and the stabilizer bush (11).
Suspension (muddy water) containing 5% of Kanto loam 8) by 1)
(20) was sprayed at a rate of 20 cc per hour.
After the twisting was performed 600,000 times, the sample was left at room temperature for 1 hour, the stabilizer bar (10) was fixed, and the support bar 14 of the test jig was manually operated as shown by arrow C. On the other hand, the presence or absence of abnormal noise generated when reciprocally rocking in the circumferential direction was evaluated at room temperature (25 ° C.) according to the following criteria. ◎ ... No sound ○ ... A slight noise is heard.

6) Adhesion of the bush inner hole after the abnormal noise test.

[0041]

[Table 2]

As is clear from Table 2 and FIG. 2, the vibration-insulating rubber (Comparative Examples 1 and 2) having a low butadiene rubber content was particularly high in the friction coefficient immediately after the abrasion test (after 15 minutes) and had abnormal noise. (Note that the static friction coefficient decreases in both the samples of Comparative Example and Example due to the effect of increasing the crosslink density with the passage of time after the abrasion test and the effect of improving the bloom speed of the lubricant, and after 60 minutes Is at the same level in the comparative example and the example). In addition, adhesive wear powder is generated on the inner surface of the bush. On the other hand, all of the anti-vibration rubbers of the present invention having a high blending ratio of butadiene rubber have a low friction coefficient immediately after the abrasion test, no abnormal noise is generated, and no adhesive wear powder is generated. Above all, in the anti-vibration rubber of the present invention, the crosslink density is
In the range of 4.0 × 10 ^{4 to} 6.0 × 10 ⁴ mol / cm ³ (Example 2), the physical property balance of normal state physical properties, lubricant film thickness and friction coefficient is particularly excellent. Further, when comparing the anti-vibration rubbers of Example 1 and Comparative Example 1 and Example 2 and Comparative Example 2, the only difference is that the composition ratio of the rubber component is different (Example: butadiene rubber / natural rubber). = 80/2
0, Comparative example: butadiene rubber / natural rubber = 75/2
5) The physical properties of the present invention are not significantly different in terms of normal state properties, crosslink density and lubricant film thickness, but the friction coefficient immediately after abrasion (about twice the difference), abnormal noise and tackiness are greatly different. It can be seen that the rubber according to (1) has a particularly excellent effect.

[0043]

The anti-vibration rubber composition of the present invention comprises a vulcanizing agent and an unsaturated fatty acid amide in a rubber component containing butadiene rubber in an amount of 78% by weight or more, and produces adhesive wear powder during friction. In addition, the bloom speed of unsaturated fatty acid amides as self-lubricants is higher than that of conventional self-lubricant-containing rubbers. Therefore, even in a use environment such as a stabilizer bush of an automobile, which is heavily worn, the friction reducing effect does not deteriorate with time, and the generation of abnormal noise due to the stick-slip phenomenon can be suppressed for a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a testing machine used for measuring a friction coefficient after a Williams wear test.

FIG. 2 is a graph showing changes in static friction coefficient of Examples and Comparative Examples after 15 minutes to 60 minutes of the Williams abrasion test.

FIG. 3 is a perspective view of a testing machine that performs an abnormal noise test due to a stick-slip phenomenon.

[Explanation of symbols]

1 Williams abrasion test specimen 2 movable platform 3 Opponent material 4 load 10 Stabilizer bar 11 Stabilizer bush 12 Mounting bracket 13 Test jig 20 Suspension (muddy water)

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Claims (6)

(57) [Claims] 1. An anti-vibration rubber composition comprising a vulcanizing agent and an unsaturated fatty acid amide in a rubber component containing butadiene rubber in an amount of 78% by weight or more (excluding the case where butadiene rubber is 100% by weight). object. 2. A rubber component 1 having an unsaturated fatty acid amide content.
It is 10 to 50 parts by weight with respect to 00 parts by weight.
The anti-vibration rubber composition described in 1. 3. A crosslink density of 2.9 × 10 ^{4 to} 7.0 × 10 ⁴ mol
The anti-vibration rubber composition according to claim 1 or 2, wherein the anti-vibration rubber composition has a viscosity of ³ / cm ³ . 4. The anti-vibration rubber composition according to claim 1, wherein the unsaturated fatty acid amide has a Bloom film thickness growth of 25 μm or more after standing at 40 ° C. for 6 days. 5. A vibration-proof rubber comprising the vibration-proof rubber composition according to any one of claims 1 to 4. 6. The anti-vibration rubber according to claim 5, which is for a stabilizer bush.