JP2002226632A - Rubber vibration insulator composition and rubber vibration insulator using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber vibration insulator composition and a rubber vibration insulator capable of suppressing noise generation caused by a stick-slip phenomenon without deteriorating a friction reduction effect in such a use environment where a stabilizer bush is worn out severely. SOLUTION: This rubber vibration insulator composition is a blend of a rubber component in an amount of 100 pts.wt. with 3-30 pts.wt. of polyoxyethylene polyol which has an average molecular weight of 400-5,000. A rubber vibration insulator using the composition is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber composition capable of suppressing abnormal noise generated in an anti-vibration rubber part used in a vehicle such as an automobile, and an anti-vibration rubber using the same. is there. More specifically, the present invention relates to an anti-vibration rubber composition and an anti-vibration rubber suitable for applications such as a stabilizer bush and a rear suspension bush of an automobile.

[0002]

2. Description of the Related Art Anti-vibration rubbers for automobiles, for example, rubber vibration absorbers used by fitting metal parts such as a stabilizer bush and a rear suspension bush, are used when starting or suddenly braking, and when turning left and right. At times and the like, abnormal noise is generated due to the stick-slip phenomenon at the contact portion between the mounting bracket and the surface of the rubber bush.

[0003] As a countermeasure, various methods for reducing the friction coefficient of the surface of the rubber compound have been studied. For example,
A method of attaching a Teflon (registered trademark) sheet having a low coefficient of friction to a contact surface, adding a wax to a rubber component, and adding a liquid silicone oil have been proposed. However, the attachment of the Teflon sheet is costly in terms of material and process, and the method of adding the wax does not sufficiently reduce the coefficient of friction. Also, the method of adding silicone oil has an excellent effect on reducing the coefficient of friction, but has a problem that compatibility with the rubber component is poor, kneading processability is remarkably inferior, and mass production is difficult. I have.

The object of the present invention is to solve such problems. In short, in order to reduce the coefficient of friction on the surface of the rubber compound, it is constantly deposited as a lubricant on the surface of the rubber compound and emerges. The present invention provides an anti-vibration rubber composition containing a polyoxyethylene polyol as a rubber component and an anti-vibration rubber using the same.

[0005]

The present invention provides a rubber component 100.
3 to 3 parts by weight of polyoxyethylene polyol
The present invention relates to a rubber composition characterized by containing 0 parts by weight. It is known that a polyoxyethylene polyol is conventionally blended with a silica-reinforced rubber composition, but this prevents a vulcanization accelerator from being adsorbed on silica, blocking active points and eliminating the acceleration effect. Therefore, the purpose is to block the adsorption point of silica with polyoxyethylene polyol in advance, and to have the effect as an activator of the so-called vulcanization reaction, and the purpose and effect are different from those of the present invention.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, carbon black is used as a major part of a reinforcing agent, and when silica is used, it is preferable that the amount is 30% by weight or less of the reinforcing agent. If the silica exceeds 30% of the reinforcing agent, the silica will adsorb polyethoxyethylene polyol which is originally useful for reducing the frictional resistance of the surface of the rubber compound, and the effect of the present invention will be impaired.

[0007] The polyoxyethylene polyol used in the present invention has an average molecular weight of 400 to 5000,
Preferably it is 1000-3500. If it is less than 400, the compatibility with the rubber component is good, and it is difficult to precipitate on the surface of the rubber compound. If it exceeds 5,000, it is difficult to migrate in the rubber component, and it is also difficult to precipitate on the surface of the rubber compound. Does not contribute to reduction. The amount of the polyoxyethylene polyol is 3 to 100 parts by weight of the rubber component.
It is 30 parts by weight, preferably 12 to 20 parts by weight. If the amount of the polyoxyethylene polyol is less than 3 parts by weight, the friction reducing effect is insufficient, and if it exceeds 30 parts by weight, the mechanical properties of the rubber deteriorate.

[0008] The friction coefficient of the surface of the rubber compound is reduced by blending the polyoxyethylene polyol in the present invention because the polyoxyethylene polyol is uniformly deposited on the surface of the rubber compound to form a film. It is estimated to be.

In the present invention, the rubber components include butadiene rubber (BR) and styrene-butadiene rubber (SB).
R), nitrile rubber (NBR), isoprene rubber (I
R), diene rubbers such as chloroprene rubber (CR), olefin rubbers such as ethylene propylene rubber (EPR, EPDM) and butyl rubber (IIR), halogenated butyl rubbers such as brominated butyl rubber (Br-IIR), and other polyurethane rubbers Synthetic rubbers including acrylic rubber, fluorine rubber, silicone rubber, chlorosulfonated polyethylene, etc., and natural rubber are exemplified, and these can be used alone or in combination of two or more.

In the rubber composition of the present invention, in addition to the above essential components, a vulcanization accelerator, a reinforcing agent, a vulcanization aid, a softening agent, a processing aid conventionally used as an additive for rubbers. , An antioxidant, a filler, and the like.

The rubber composition of the present invention can be obtained by kneading these components with a usual processing apparatus, for example, a roll, a Banbury mixer, a kneader or the like. The vibration-proof rubber can be obtained by vulcanizing this rubber composition by a known method.

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

[0013]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited by these descriptions.

Examples 1-4 and Comparative Examples 1-4 Natural rubber, butadiene rubber, FEF carbon black, polyoxyethylene polyol (trade name: PEG300, etc .; manufactured by Sanyo Chemical Co., Ltd.) and additives As shown in FIG. 1, the vibration-proof rubber compositions of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared.

[0015] The above additives are 3 parts by weight of aroma-based process oil, 5 parts by weight of Zinhua No. 3, 1 part by weight of stearic acid, 2 parts by weight of wax, and antioxidant 6C (manufactured by Ouchi Shinko Chemical Co., Ltd.). ) 2 parts by weight, antioxidant RD (Ouchi Shinko Chemical
2 parts by weight, 1.5 parts by weight of sulfur, vulcanization accelerator CZ
1.5 parts by weight (manufactured by Ouchi Shinko Chemical Co., Ltd.), vulcanization accelerator TS
(Ouchi Shinko Chemical Co., Ltd.) 0.5 parts by weight.

The above rubber composition was molded into a stabilizer bush shape and vulcanized at 150 ° C. for 30 minutes, and the presence or absence of abnormal noise was evaluated using a tester shown in FIG. That is, the stabilizer bush 3 shown in FIG.
Is loaded with a metal stabilizer bar 2, and the stabilizer bush 3 is tightened with a clamp, and the bar 2 is
Torsion, then check for abnormal noise at room temperature (25 ° C)
Check that no abnormal noise occurred.
Those having abnormal noise were evaluated as "x".

From the results in Table 1, it can be seen that PEG1 of Examples 1 to 4
000 (average molecular weight 1000) or PEG4000S
It can be seen that no abnormal noise was generated from the stabilizer bush containing (average molecular weight: 3300).

[0018]

[Table 1]

[0019]

By applying the vibration-proof rubber composition of the present invention to a vibration-proof rubber, it is possible to suppress the generation of abnormal noise due to friction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a stabilizer bush.

[Explanation of symbols]

 3 Stabilizer bush 2 Stabilizer bar 1 Through hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // (C08L 21/00 C08L 71:02) 71:02) G10K 11/16 A (72) Inventor Fujino Shuji 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka F-term (reference) in Toyo Tire & Rubber Co., Ltd. CK021 CP031 5D061 AA04 AA06 DD08

Claims (3)

[Claims] An anti-vibration rubber composition comprising 3 to 30 parts by weight of a polyoxyethylene polyol based on 100 parts by weight of a rubber component. 2. The rubber composition according to claim 1, wherein the polyoxyethylene polyol has an average molecular weight of 400 to 5,000. 3. An anti-vibration rubber comprising the anti-vibration rubber composition according to claim 1.