JP5399169B2 - Lubricating rubber composition and anti-vibration rubber - Google Patents

Description

  The present invention relates to a lubricating rubber composition from which a rubber surface having lubricity can be obtained, and a vibration-proof rubber using the same.

  Conventionally, for example, in automobile rubber parts such as a stabilizer bush and a suspension bush, there are many problems of noise due to rubbing between rubber and rubber or between rubber and metal. As a countermeasure against such abnormal noise, a lubricating rubber composition (also referred to as a self-lubricating rubber composition) to which a lubricant such as fatty acid amide is added is used (see Patent Documents 1 to 4 below).

JP-A-6-234886 JP 7-278355 A JP 2001-225647 A JP 2006-225481 A

  In the above-described conventional technology, the lubricity is improved by increasing the amount of lubricant, adding a lubricating auxiliary agent, and an accelerator, and has been aimed only at improving the lubricity. However, when a large amount of a fatty acid amide, which is a lubricant, is added in order to improve lubricity, there is a problem in that the sag resistance decreases and the adhesion to the metal fitting decreases. Also, in terms of lubricity, a single fatty acid amide exhibits excellent lubricity only in a narrow temperature range depending on its melting point, so that sufficient lubricity in a wide temperature range cannot be expected. It is trying to ensure lubricity in a wide temperature range by blending a large amount. As a result, there is also a problem that the sag resistance and adhesion are impaired from this point.

  In view of the above, the present invention provides a lubricating rubber composition that can exhibit lubricity in a wide temperature range while improving sag resistance and adhesiveness, and a vibration-proof rubber using the same. For the purpose.

Lubricating rubber composition according to the present invention, the 100 parts by weight of the rubber component, and oleamide 1-2 parts by weight, and stearic acid amide 1-2 parts by weight, the kinematic viscosity at 25 ℃ 10~50 mm ² / It contains 1 to 4 parts by weight of silicone oil of s. The vibration-proof rubber according to the present invention is obtained by using the rubber composition.

  According to the rubber composition of the present invention, by combining oleic acid amide and stearic acid amide as fatty acid amides, and further combining a silicone oil having a specific viscosity, adhesive properties such as adhesive strength and peeling mode are obtained. Moreover, lubricity can be exhibited in a wide temperature range while improving sag resistance.

It is (a) front view and (b) sectional drawing which show an example of a stabilizer bush. It is (a) front view and (b) sectional view showing an example of a vibration proof bush. It is a perspective view of the stabilizer bush for demonstrating the evaluation test method of lubricity. It is a perspective view of the test piece used for an adhesive evaluation test. It is a graph which shows the temperature dependence of lubricity. It is a graph which shows the relationship between the viscosity of silicone oil, and the lubricity at normal temperature.

  Hereinafter, matters related to the implementation of the present invention will be described in detail.

  In the rubber composition according to the present invention, the rubber component is not particularly limited. For example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), and nitrile rubber (NBR). , Various rubber polymers such as chloroprene rubber (CR), butyl rubber (IIR), halogenated butyl rubber, ethylene propylene rubber (EPDM), and the like can be used alone or in combination of two or more. The rubber component is preferably a diene rubber such as NR, IR, BR, SBR, NBR, CR, etc. When used as an anti-vibration rubber, especially NR alone or NR and other diene rubbers It is preferable to contain 50% by weight or more of NR as a main component.

  In the rubber composition according to the present invention, oleic acid amide and stearic acid amide are used in combination as the fatty acid amide that is a lubricant. Both are used for the following reason.

  That is, the fatty acid amide bleeds on the rubber surface after the production of the rubber product to form a coating layer, and the coating layer of the fatty acid amide brings about a reduction in the friction coefficient on the rubber surface and exhibits lubricity. This temperature range in which lubricity can be expected tends to depend on the melting point and the amount of fatty acid amide added. For example, when the ambient temperature increases, the coating layer dissolves in the rubber, making it difficult to exhibit lubricity. Although the maximum temperature at which the lubricating performance can be exhibited varies depending on the amount of fatty acid amide added, it has been found that, on average, the melting point is about −10 ° C. to −20 ° C.

As represented by the following formula (1), oleic acid amide is an unsaturated fatty acid amide having 18 carbon atoms and has a melting point of 70 to 75 ° C. Moreover, as represented by the following formula (2), stearic acid amide is a saturated fatty acid amide having 18 carbon atoms and has a melting point of 97 to 105 ° C. Therefore, by using these relatively low melting point oleic acid amide and relatively high melting point stearic acid amide together and utilizing the fact that there is a difference of about 25 ° C. between the two melting points, low temperature and normal temperature (− The oleic acid amide functions mainly up to about 40 to 50 ° C., and the stearic acid amide mainly functions at a high temperature (about 50 to 80 ° C.), so that lubricity can be exhibited in a wide temperature range.
CH ₃ (CH ₂ ) ₇ CH═CH (CH ₂ ) ₇ CONH ₂ (1)
CH ₃ (CH ₂ ) ₁₆ CONH ₂ (2)

  The blending amount of these fatty acid amides is preferably 1 to 5 parts by weight, more preferably 1 to 3 parts by weight, and still more preferably 1 to 2 parts by weight with respect to 100 parts by weight of the rubber component. Moreover, it is preferable that a stearic acid amide is also 1-5 weight part, More preferably, it is 1-3 weight part, More preferably, it is 1-2 weight part. Fatty acid amides are more excellent in lubricity and lubricity maintenance as the amount added is increased, but the sag resistance and adhesiveness are reduced as the amount added is increased. Therefore, it is preferable to set within the above range from the balance of these performances. From such a viewpoint, the total amount of oleic acid amide and stearic acid amide is preferably 1 to 8 parts by weight, more preferably 1 to 5 parts by weight, still more preferably 100 parts by weight of the rubber component. Is 2 to 4 parts by weight.

  In the present invention, as the lubricant, other fatty acid amides may be used in combination with the oleic acid amide and stearic acid amide. Such fatty acid amide is not particularly limited, and for example, saturated or unsaturated having 12 to 22 carbon atoms such as myristic acid amide, palmitic acid amide, palmitoleic acid amide, linoleic acid amide, linolenic acid amide, erucic acid amide and the like. And fatty acid amides. However, even when other fatty acid amides are used in combination, the blending amount of the fatty acid amides is 1 to 8 parts per 100 parts by weight of the rubber component in consideration of the above-described balance between sag resistance and adhesiveness and lubricity. It is preferable that it is a weight part, More preferably, it is 1-6 weight part, More preferably, it is 2-4 weight part.

In the rubber composition according to the present invention, a silicone oil having a kinematic viscosity of 5 to 100 mm ² / s at 25 ° C. is blended as a lubricant (lubricant aid) that supplements the lubricity by the oleic amide and stearic amide. To do. Such a silicone oil is considered to coat the fatty acid amide on the rubber surface, and can thereby exhibit a synergistic effect excellent in lubricity and durability. Specifically, silicone oil has a small change in viscosity due to a change in temperature, and its solubility in rubber is also less temperature-dependent. Therefore, the lubricity does not change greatly in the actual use temperature range (about −40 to 80 ° C.). Therefore, while suppressing the blending amount of oleic amide and stearic amide, the lubricity by these fatty acid amides can be supplemented and the lubricity in a wide temperature range can be maintained. In addition, the fatty acid amide has a risk that the coating layer on the rubber surface is cracked in a low temperature atmosphere and the lubricity may be impaired due to peeling or dropping. It can be made difficult to break, and the life of lubricity can be extended.

The lubricity due to silicone oil depends on its viscosity.Lower viscosity forms a film with higher lubricity on the rubber surface, and lower viscosity is more likely to bloom on the rubber surface. (See FIG. 6). That is, by using a low-viscosity silicone oil having a kinematic viscosity at 25 ° C. of 5 to 100 mm ² / s, it is possible to compensate for a decrease in lubricity due to a small amount of fatty acid amide. On the other hand, the silicone oil tends to lower the adhesiveness as the viscosity becomes lower. Therefore, from the viewpoint of lubricity and adhesiveness, the viscosity of the silicone oil is preferably 15 to 60 mm ² / s, more preferably 15 to 35 mm ² / s in terms of kinematic viscosity at 25 ° C. Here, the kinematic viscosity of the silicone oil is measured by a capillary viscometer method according to JIS Z 8803.

Examples of the silicone oil include dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, and modified silicone oil having an organic group introduced at the side chain or terminal thereof. Preferably, dimethylpolysiloxane represented by the following general formula (3) is used.

  In the formula, n is an integer.

  If the amount of silicone oil is too large, the adhesiveness and processability will be reduced (however, if the equivalent amount is added, the adhesiveness will not be reduced as much as fatty acid amide), so 100 parts by weight of rubber component 1 to 10 parts by weight, more preferably 2 to 4 parts by weight.

  In the rubber composition according to the present invention, various additives blended in a general lubricating rubber composition, for example, fillers such as carbon black and silica, oil, zinc white, stearic acid, processing aid, vulcanization An agent (for example, sulfur), a vulcanization accelerator, and the like can be appropriately blended within a range that does not impair the object and effect of the present invention.

  The carbon black is not particularly limited, and various grades such as GPF class, FEF class, HAF class, ISAF class, and SAF class are used. Although the compounding quantity of carbon black is not specifically limited, It is preferable that it is 20-150 weight part with respect to 100 weight part of rubber components, More preferably, it is 30-100 weight part.

  The rubber composition can be prepared by kneading using a commonly used Banbury mixer, kneader, or other mixer, and requires lubricity by vulcanization molding at, for example, 140 to 200 ° C. according to a conventional method. Various rubber products can be manufactured. Examples of such rubber products include various rubber parts of vehicles such as automobiles (for example, stabilizer bushes, suspension bushings, muffler hangers, strut mounts, engine mounts, body mounts, member mounts, torsional dampers, etc. And door seals such as weather strips) and vibration-proof rubbers for various industrial equipment.

  FIG. 1 shows an example of a stabilizer bush (1) as an anti-vibration rubber using the rubber composition. The stabilizer bush (1) is a thick-walled cylindrical rubber member, and is formed by injection molding of the rubber composition. As shown in the drawing, the stabilizer bush (1) is configured to insert and hold the stabilizer bar (5) in the hollow portion (2) having a circular cross section. Moreover, the main body (3) of the stabilizer bush (1) having a thick cylindrical shape has a flange portion (4) projecting radially at both end edges in the axial direction, with the top surface (3A) being substantially flat. The outer peripheral surface (3B) between these flange portions (4) has a substantially U-shaped cross section, and is held in a substantially U-shaped bracket (not shown) and fixed to the vehicle body side via the bracket. It is comprised so that.

  Such a stabilizer bush is used by fitting a stabilizer bar, which is a metal part, so that the rotational force and the friction at the contact portion between the stabilizer bar and the inner surface of the stabilizer bush at the time of starting, sudden braking, turning, etc. It is easy to generate unusual noise due to stick-slip phenomenon. Therefore, by forming the stabilizer bush with the above lubricating rubber composition, the lubricating components (oleic acid amide, stearic acid amide and silicone oil) work as a self-lubricant that gradually blooms on the rubber surface, and the friction coefficient over a wide temperature range The occurrence of abnormal noise can be prevented by reducing the noise. Also, in this case, if the stabilizer bushes sag with time, a gap will be formed between the stabilizer bushes and the stabilizer bar, and mud etc. may enter into the gaps. Since it is excellent in sag resistance when it is a thing, generation | occurrence | production of the abnormal noise resulting from such intrusion of mud can also be prevented.

  FIG. 2 shows an example of an anti-vibration bush (10) used for a suspension bush or the like as an anti-vibration rubber using the rubber composition. Here, FIG.2 (b) is the IIb-IIb sectional view taken on the line of (a).

  The anti-vibration bush (10) includes an inner cylinder fitting (11), an outer cylinder fitting (12) surrounding the inner cylinder fitting (11) coaxially, an outer peripheral surface of the inner cylinder fitting (11), and an outer cylinder fitting ( The rubber elastic body (13) is vulcanized and bonded to the inner peripheral surface of 12) to connect the two, and the rubber elastic body (13) is formed of the lubricating rubber composition. The rubber elastic body (13) is provided with a pair of straight portions (14) and (14) at positions opposed to each other in the radial direction with the inner cylinder fitting (11) interposed therebetween. As shown in FIG. 2 (b), the straight portion (14) includes a first recess (15) that is recessed from one side in the axial direction and a second recess (16) that is recessed from the other side in the axial direction. It is comprised, and it forms in the non-penetrating shape by providing the connection part (17) of a rubber elastic body (13) in the axial direction center part.

  In such an anti-vibration bush (10), since the rubber elastic body (13) is vulcanized and bonded to the inner cylinder fitting (11) and the outer cylinder fitting (12), the rubber composition has adhesiveness to the fitting. Is required. Further, when the straight portion (14) is crushed due to excessive displacement in the direction perpendicular to the axis and the opposing wall surfaces of the straight portion (14) come into contact with each other, there is a possibility that abnormal noise may be generated due to contact between the rubbers. On the other hand, since the said rubber composition is excellent in adhesiveness and lubricity, these problems can be eliminated. Moreover, since this rubber composition is excellent also in sag-proof property, the performance fall by the sag of a rubber elastic body (13) can also be prevented.

  Examples of the present invention will be described below, but the present invention is not limited to these examples. In addition, the evaluation method of each evaluation item is as follows.

[Lubricity]
(1) Finger touch evaluation A test piece having a thickness of 2 mm vulcanized at 150 ° C. for 10 minutes was subjected to sensory evaluation of slipperiness by touching the rubber surface with a finger at each ambient temperature shown in Table 1. The evaluation was performed in a five-step evaluation in which the lubricity at normal temperature in Test Example 1 was “5” (excellent in lubricity) and the lubricity at normal temperature in Test Example 3 was “1” (inferior in lubricity). It was.

(2) Bush evaluation The stabilizer bush shown in FIG. 1 was vulcanized (155 ° C. × 8 minutes), the obtained stabilizer bush, and an iron bar with a diameter of 20.0 mm, the surface of which was electrodeposition-coated (cationic coating) The frictional force between was measured. As shown in FIG. 3, the measurement was performed by inserting a steel bar (5) through the stabilizer bush (1) and applying compression of 11.9% in the vertical direction Z with the U-shaped bracket (6). The bar (5) was displaced by ± 40 mm in the axial direction X at a speed of 50 mm / min, and the resistance load (removal force) and its waveform were evaluated. The ambient temperature during the test was -40 ° C, 0 ° C, normal temperature (25 ° C), 40 ° C, and 80 ° C. Check the presence or absence of the stick-slip waveform for the above waveform, indicate that there is no stick-slip sound, indicate that there is no stick-slip sound in Tables 2 and 3, and mark that with the same waveform as stick-slip sound. Displayed as “×”.

[Sag resistance]
In accordance with JIS K6262 (compression set), a cylindrical test piece (vulcanization molding condition: 150 ° C. × 10 minutes) having a diameter of 29.0 mm × height of 12.5 mm was measured using a jig. 25.0% compressed in the direction (height 9.38 mm), left in a constant temperature bath at an ambient temperature of 80 ° C., measured the height of the test piece after a predetermined time, and compression set CS ( %) Was calculated. The standing time was 240 hours. The smaller the compression set, the better the sag resistance.

[Adhesiveness]
The test piece shown in FIG. 4 was produced based on JIS K6256. As shown in the figure, the test piece is obtained by attaching an iron plate to a strip-shaped rubber member vulcanized and molded at 160 ° C. for 4 minutes via an adhesive. Using this test piece, a tensile peel test was performed from a direction of 90 ° with respect to the adhesive surface (tensile speed: 50 mm / min) to determine the adhesive strength and the peel mode. Regarding the peeling mode, RR means a peeling mode between rubber and rubber, and ThinRR means a peeling mode with an extremely thin rubber layer, but RR is more preferable. However, since both are destruction with rubber, the peeling mode is good. Other peeling modes include peeling at the interface between the rubber and the adhesive and peeling at the interface between the adhesive and the metal fitting. Moreover, the numerical value attached | subjected to peeling mode shows the area ratio of the said peeling mode in all the peeling surfaces, "RR-100" is a peeling mode between rubber | gum and rubber | gum, and all peeling surfaces are rubber | gum. means.

[Test example: Selection of fatty acid amide]
According to the formulation shown in Table 1 below, a rubber composition was prepared according to a conventional method using a Banbury mixer. Each component in Table 1 is as follows.

・ Natural rubber: RSS # 3
・ Butadiene rubber: “VCR412” manufactured by Ube Industries, Ltd.
・ Squatting agent: “ACTI PLAST M” manufactured by LANXESS
・ Zinc flower: ▲ Shin ▼ "Taiwan active zinc flower" manufactured by An Industry Co., Ltd.
・ Stearic acid: “Tsubaki stearic acid” manufactured by NOF Corporation
Anti-aging agent: 6C, “Vulcanox 4020” manufactured by LANXESS
・ Carbon black: “NITERON 10K” manufactured by Nippon Nihon Carbon Co., Ltd.
・ Oil: Japan Energy Co., Ltd. “RX-70”
・ Oleic acid amide: “Fatty Acid Amide ON” manufactured by Kao Corporation
・ Stearic acid amide: “Fatty Acid Amide T” manufactured by Kao Corporation
-Erucamide: "Fatty Acid Amide E" manufactured by Kao Corporation
・ Sulfur: “Lenogran S-80” manufactured by LANXESS
・ Vulcanization accelerator 1: “Lenogran CBS-80” manufactured by LANXESS
-Vulcanization accelerator 2: "Lenogran TMTD-80" manufactured by LANXESS.

  About each obtained rubber composition, lubricity was evaluated (finger touch evaluation). The results are as shown in Table 1. The rubber composition of Test Example 1 added in a large amount even when oleic acid amide was used alone was able to exhibit lubricity in a wide temperature range, but the test example was reduced in addition amount. In No. 2, the lubricity at high temperature was poor. Test Example 2 is a suspension bush control composition. In the case of the suspension bush, abnormal noise between rubbers due to the crushing of the beveled portion as described above becomes a problem. Since the rubber is soft at high temperatures and the curled portion is easily crushed, the rubbers easily come into contact with each other. Therefore, it is important to maintain lubricity at high temperatures, and improvement is required.

  On the other hand, in Test Example 4 using erucic acid amide as the fatty acid amide, the lubricity at 60 ° C. was improved, but the improvement effect at 80 ° C. was not obtained. The same was true in Test Example 7 in which oleic acid amide and erucic acid amide were used in combination. On the other hand, in Test Example 5 in which stearamide was used alone, the lubricity at high temperature was exhibited, but the lubricity at room temperature was poor. Also in Test Example 8 where stearamide and erucamide were used in combination, the lubricity at room temperature was poor. This is because the above three fatty acid amides have oleic acid amide> erucic acid amide> stearic acid amide, so when erucic acid amide and stearic acid amide are used in combination, the temperature dependence is slightly improved. However, it is presumed that there is a slight problem in lubricity near normal temperature.

  In contrast, in Test Examples 6, 9, and 10 in which oleic acid amide and stearic acid amide were used in combination, the lubricity was exhibited in a wide temperature range while the amount of fatty acid amide was suppressed to a small amount.

  Moreover, about the test piece which vulcanized-molded the rubber composition of Test Example 2, 4, 5 and 6 into the sheet form, when the friction coefficient at normal temperature of the rubber surface was measured using tribogear (made by HEIDON), it was a test example. 2 was 0.246 μk, Test Example 4 was 0.351 μk, and Test Example 5 was 1.753 μk, whereas Test Example 6 was 0.237 μk, and a rubber having a low friction coefficient was obtained.

[Examples and Comparative Examples]
According to the composition shown in Tables 2 and 3 below, a rubber composition was prepared according to a conventional method using a Banbury mixer. Each component in Tables 2 and 3 is as follows. However, the same thing as what was described in Table 1 is as above-mentioned. Examples 1, 6, and 7 are reference examples.

Silicone oil 10cs: “KF-96-10cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 10 mm ² / s)
Silicone oil 20cs: “KF-96-20cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 20 mm ² / s)
Silicone oil 30cs: “KF-96-30cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 30 mm ² / s)
Silicone oil 50cs: “KF-96-50cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 50 mm ² / s)
Silicone oil 100cs: “KF-96-100cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 100 mm ² / s)
Silicone oil 200cs: “KF-96-200cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 200 mm ² / s)
Silicone oil 500cs: “KF-96-500cs” manufactured by Shin-Etsu Chemical Co., Ltd. (dimethylpolysiloxane, kinematic viscosity at 25 ° C .: 500 mm ² / s).

  About each obtained rubber composition, lubricity, sag-proof property, and adhesiveness were evaluated. The results are as shown in Tables 2 and 3. In Table 3, “-” indicates that measurement has not been performed.

  Comparative Example 1 is a stabilizer blend of stabilizer bushes, and oleic amide is blended in a large amount alone. Therefore, although lubricity was obtained in a wide temperature range, the sag resistance was poor. Comparative Example 2 is a control formulation of a suspension bush that requires adhesion, and since the amount of oleic amide is less than that of Comparative Example 1, the sag resistance is improved, but the lubricity is compared. It was inferior to Example 1, in particular, the resistance load at normal temperature was larger than 1500 N, and the lubricity at high temperature at which the straight part was easily crushed by the softening of rubber was also inferior.

  In Comparative Example 3, since the fatty acid amide and the silicone oil were not blended, the lubricity was greatly inferior. Comparative Example 4 is a combination of oleic acid amide and stearic acid amide, but since the blending amount thereof was small and no silicone oil was added, lubricity in a wide temperature range, particularly on the low temperature side. Was insufficient. Further, even in Comparative Example 5 in which the fatty acid amide was not blended and the silicone oil was used alone, the lubricity in a wide temperature range, in particular, the lubricity on the low temperature side was insufficient.

  On the other hand, in Examples 1-7, by using a combination of oleic acid amide, stearic acid amide, and silicone oil, the amount of fatty acid amide was suppressed to a small amount, and in a wide temperature range. Lubricity was exhibited (see FIG. 5), and since the amount of fatty acid amide was small, it was excellent in sag resistance and adhesiveness.

  Specifically, the sag resistance is deteriorated in proportion to the blending amount of the fatty acid amide. In the rubber compositions of the examples according to the present invention, the addition of silicone oil as a lubricating auxiliary agent resulted in the fatty acid amide. As a result, the sag resistance was also improved.

Further, as is clear from Examples 1 to 5 and Comparative Examples 6 and 7, the smaller the viscosity of the silicone oil, the better the lubricity (see FIG. 6). By using a silicone oil having a kinematic viscosity of 100 mm ² / s or less, the lubricity (resistance load) at room temperature can be reduced to about 1500 N or less. More particularly, FIG. 6 is a semi-log plot showing the viscosity of the silicone oil in logarithmic, in a low viscosity range of 10 to 50 mm ² / s, the high viscosity range of 50 to 500 mm ² / s, the lubricating The tendency of the property (that is, the relationship between the viscosity and the resistance load) was clearly different. From this graph, those having a low viscosity range of 50 mm ² / s or less have better lubricity and bleeding properties of the silicone oil itself, and as shown in Examples 2 to 5, better lubricity is obtained. I found out that

In addition, as shown in Example 5 in Table 2, the adhesiveness is reduced with a decrease in the viscosity of the silicone oil. Therefore, in terms of adhesiveness, the kinematic viscosity is 15 mm ² / s or more. It turns out that it is preferable. Furthermore, as is clear from the comparison of Examples 5 to 7 in Table 2, the adhesiveness decreases as the amount of silicone oil added increases, and the amount of silicone oil blended is optimally 2 to 4 parts by weight. .

  The lubricating rubber composition according to the present invention can be suitably used for rubber products for vehicles such as stabilizer bushes and other rubber products for vehicles, and vibration-proof rubbers for various industrial equipment.

DESCRIPTION OF SYMBOLS 1 ... Stabilizer bush, 2 ... Hollow part, 3 ... Main body, 4 ... Flange part, 5 ... Stabilizer bar

Claims (5)

100 parts by weight of a rubber component, 1 to 2 parts by weight of oleic acid amide, 1 to 2 parts by weight of stearic acid amide, 1 to 4 parts by weight of silicone oil having a kinematic viscosity at 25 ° C. of 10 to 50 mm ² / s, A lubricating rubber composition comprising The lubricating rubber composition according to claim 1, wherein the silicone oil has a kinematic viscosity at 25 ° C. of 15 to 35 mm ² / s. The lubricating rubber composition according to claim 1 or 2, wherein the amount of the silicone oil is 2 to 4 parts by weight per 100 parts by weight of the rubber component. Anti-vibration rubber | gum which uses the rubber composition of any one of Claims 1-3 . An inner cylinder fitting, an outer cylinder fitting that surrounds the inner cylinder fitting coaxially, and an outer peripheral surface of the inner cylinder fitting and a rubber elastic body that is bonded to the inner circumference of the outer cylinder fitting and connects the two, An anti-vibration bush, wherein the rubber elastic body is provided with a curled portion, and the rubber elastic body is formed of the rubber composition according to any one of claims 1 to 3.