JPH09226057A - Vibration-damping rubber composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-damping rubber composite which can realize calmness of sound and low vibration by absorbing various vibrations and impacts. SOLUTION: Strength as a vibration-damping rubber is improved without complicating the manufacturing process and there exists no possibility of staining the bases when it is used as rubber legs for an instrument by laminating a fabric material 4 made of a fiber on the surface of a vibration-damping rubber compsn. 3 with a loss tangent (tanδ) of at least 0.5 at least in a temp. range of 5-35 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-damping rubber composite which can absorb various vibrations and shocks to reduce noise and vibrations.

[0002]

2. Description of the Related Art Anti-vibration rubber is used for industrial equipment, motors and OA.
It is widely used as a spacer, a bush, a rubber leg, and the like in equipment and athletic shoes. A practical vibration damping rubber has a loss tangent (tan δ) of 0.5 or more to convert vibration energy into heat energy to reduce repulsion elasticity and absorb vibration and impact.

By the way, many of the vibration damping rubbers have a resin (resin) or the like mixed in their components in order to increase the loss tangent (tan δ). Therefore, the vibration-damping rubber has a stronger surface adhesiveness than general natural rubber, etc., and the surface becomes sticky, making it difficult to manage for storage, and when used as a rubber foot, the bottom surface of this rubber foot However, there are many problems in use, such as contact with the surface of the base to be touched and stain of the surface of the base.

The damping rubber is a normal vulcanized rubber (for example, tan δ is smaller than 0.5 at 20 ° C. and 110 Hz).
In general, the rubber strength such as tensile strength and tear strength tends to decrease, and the vibration-damping rubber composition can be used alone as a vibration and impact with a low load and a low impact. Limited to the field.

Conventionally, in order to solve these problems,
For example, as an example of a stopper, as shown in FIG. 8, a ring-shaped damping rubber composition a is reinforced by adhering a metal plate b such as a flat washer or the like, and in order to prevent adhesion of the rubber to the base, It has been proposed that the rubber surface is chemically treated such as by coating with Teflon, and further that the polyethylene film is attached to the surface of the rubber leg that comes into contact with the base.

[0006]

However, in the case where the metal plates are bonded together, there is a problem that the weight as a whole is significantly increased, the base is damaged by the metal plates, and the manufacturing process is complicated. is there.

Further, in the case where the rubber surface is chemically treated,
Similar to the above, in addition to causing a large increase in the manufacturing process, there is a problem that the surface coating is peeled off at an early stage due to repeated deformation of rubber and the like, so that a sufficient effect cannot be exerted yet. Further, in the case where a polyethylene film is attached to the surface of the vibration-damping rubber composition, the effect of reinforcing the rubber cannot be expected at all, so that there is a problem that the intended use is still limited.

The inventors of the present invention have conducted extensive studies in view of the above problems, and as a result, based on the fact that a cloth material made of fiber is attached to the surface of the vibration damping rubber composition, the manufacturing process is basically performed. An object of the present invention is to provide a vibration-damping rubber composite that does not complicate the strength of the vibration-damping rubber, and that does not stain the base even when used as a rubber leg of various devices.

[0009]

[Means for Solving the Problems] Claim 1 of the present invention
The invention described above is characterized in that a cloth material made of fibers is bonded to the surface of the damping rubber composition having a loss tangent (tan δ) of 0.5 or more in a temperature range of at least 5 to 35 ° C. It is a vibration damping rubber composite.

In the invention according to claim 2, the damping rubber composition contains 100 parts by weight of a synthetic rubber polymer,
Softening point Sp of 50-120 ° C and solubility constant SP
Contains 10 to 120 parts by weight of a resin of 7.0 to 13.0, and has a loss tangent (t
An δ) is 0.5 or more.

Further, in the invention of claim 3, the vibration-damping rubber composition is formed in a long shape and the cloth material is adhered to only one surface thereof, and the total thickness of the composite is 1 It is characterized in that it is 0.0 to 3.0 mm.

Further, the invention according to claim 4 is characterized in that the cloth material is attached to the vibration damping rubber composition by vulcanization of the vibration damping rubber composition.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. The damping rubber composite 2 of the present invention is shown in FIG.
As shown in FIG. 3, the surface of the vibration damping rubber composition 3 is laminated with a cloth material 4 made of fibers, and in this example, the vibration damping rubber composition is formed into a long sheet, and In this example, the cloth material is attached so that only the surface of the cloth is exposed.

In the present invention, the vibration damping rubber composition 3 is used.
As shown in the curve A of FIG. 2, the loss tangent (tan δ) is 0.5 or more in the temperature range of at least 5 to 35 ° C. from the viewpoint of practically minimum vibration and shock absorption. Is required, but preferably -30 ° C to 30 ° C,
More preferably, as shown by the curve B, -40 to 40 ° C
It is desirable that the loss tangent (tan δ) is 0.5 or more in the temperature range of 1. In this case, it is preferable in that the vibration damping performance can be exhibited even in a low temperature environment.

When the loss tangent (tan δ) is less than 0.5, it is difficult to obtain a practical vibration damping effect. The upper limit of the loss tangent (tan δ) is not particularly limited, but may be about 3, for example. In this specification, the loss tangent (tan δ) is 3 mm width × 25 mm length × 2.0 mm.
A strip-shaped sample having a thickness is defined as a value measured using a viscoelastic spectrometer manufactured by IT Measurement and Control Co., Ltd. under the conditions of a frequency of 110 Hz and a dynamic strain of 0.1%.

In the present example, the damping rubber composition 3 contains 10 to 12 parts of resin with respect to 100 parts by weight of synthetic rubber polymer.
Contains 0 parts by weight. Then, by adding various compounding agents, additives, etc., the total amount is, for example, about 190 to 500 parts by weight.

Examples of the synthetic rubber polymer include norbornene rubber (NOR) and epichlorohydrin rubber (EC
O), acrylonitrile-butadiene rubber (NBR),
Butyl rubber (IIR), halogenated butyl rubber (XI
IR), styrene butadiene rubber (SBR), chlorosulfonated polyethylene rubber (CSM), ethylene propylene rubber (EPDM) and the like can be preferably used alone or in combination of two or more.

The synthetic rubber polymer preferably has a glass transition point Tg of -80 to -15 ° C. And
More preferably, the glass transition point Tg is −65 to −30.
By using a polymer in the temperature range of ° C, the vibration-damping rubber composition after vulcanization can secure rubber elasticity and exhibit vibration-damping properties even at low temperatures.

The glass transition point Tg is -15 ° C.
When it is higher than 0.5, it tends to be difficult to keep the loss tangent (tan δ) at 0.5 or more in the temperature range of 5 to 35 ° C.

The synthetic rubber polymer may be used alone or in combination of two or more, and the glass transition point Tg may be adjusted.
Uses a differential scanning calorimeter (DSC) and JIS K
7121 It measures according to the regulation of "Plastic transition temperature measuring method".

Examples of the resin include coumarone indene resin, modified phenol resin, terpene resin,
A terpene phenol resin, a petroleum hydrocarbon resin, polybutene, a rosin derivative, polystyrene, polyvinyl chloride or the like can be appropriately used, and preferably, a resin having a softening point Sp in the range of 50 to 120 ° C is used. good.

When the softening point Sp is lower than 50 ° C. or higher than 120 ° C., the damping rubber is 5
There is a tendency that sufficient vibration damping properties cannot be exhibited in a temperature range of up to 35 ° C.

The softening point Sp is determined by JIS K7206.
"Test method for Vicat softening temperature of thermoplastics"
The value measured according to

In the resin, the solubility constant SP corresponding to the synthetic rubber polymer is set in the range of approximately 7.0 to 13.0 in order to improve the affinity with the rubber polymer and enhance the adhesiveness. Is preferred. For example, when the synthetic rubber polymer is a nitrile rubber polymer, the solubility constant SP of the resin is preferably about 10.0 to 13.0.

Next, as the cloth material, natural fibers such as cotton, wool, silk and hemp, or various chemical fibers such as rayon, polyester, nylon, vinylon and acetate can be used. Then, using one or more kinds of these fibers, a sheet-shaped cloth material having an arbitrary thickness such as a plain weave, a hood cloth, a non-woven fabric, a gauze, and a screen is processed.

In order to produce the vibration-damping rubber composite of the present invention, first, a synthetic rubber polymer is mixed with a resin and various compounding agents and masticated. For example, as shown in FIG. 3, these are extruded. It is continuously extruded from the machine 5 as an unvulcanized or semi-vulcanized long sheet body.

The cloth material 4 is wound, for example, in a roll shape and mounted on an unwinder or the like, and is continuous toward one surface side of the extruded unvulcanized vibration damping rubber composition. By being delivered, they can come into close contact with each other.

By passing through the continuous vulcanizer 6 in a state where they are in close contact with each other, they are firmly adhered simultaneously with vulcanization, and the vibration-damping rubber composite 2 is continuously obtained from the downstream side of the continuous vulcanizer. be able to.

As a result, the vibration-damping rubber composite body 2 of this embodiment can be manufactured without complicating the conventional manufacturing process, so that the production cost can be prevented from rising and the cloth material 4 made of fiber can be prevented. By sticking, it is possible to prevent an increase in weight as in the case of sticking a metal plate.

The vibration-damping rubber composite preferably has a total thickness t (shown in FIG. 1) of 1.0 to 30 mm, preferably 1.0 to 3.0 mm. The vibration-damping rubber composite is shaped like a washer, as shown in FIG. 5, as well as a spacer, a rubber leg, etc., which is punched by a press or processed by a cutter or the like. .

Note that, as shown in FIG. 6, the cloth material 4 can be attached to both surfaces of the vibration damping rubber composition 3 by the same method as described above.

The damping rubber composite 2 as described above is made up of the cloth material 4
As a result of being reinforced with, a good result of punching is obtained, and as shown in FIG. 4, a plurality of sheets of the vibration damping rubber composite 2 are laminated so that the rubber and the cloth material are alternately arranged. Even if the punching is performed in a batch at a time, it is preferable in that extremely excellent machining accuracy can be obtained.

Conventionally, the vibration-damping rubber to which a polyethylene film is adhered has a problem that it is often deformed if left standing after punching, but the vibration-damping rubber composite 2 of the present invention is a cloth. Due to the reinforcing effect of the material 4, almost no deformation can be seen even after punching, and the dimensional accuracy can be significantly improved.

Further, since the one surface of the vibration damping rubber composite 2 is rubber, this rubber surface can be easily adhered to a metal casing of a motor or the like.

Further, as shown in FIG. 7, the vibration-damping rubber composite body 2 has a hole 2A capable of accommodating the head of the bolt 7,
By adhering the bolt, it can be used as a non-repulsion stopper or various rubber legs that can be adjusted by the tightening amount of the bolt. At this time, by bringing the surface of the cloth material 4 into contact with the base or the like, the rubber does not adhere to the base, and the stain is prevented. It is desirable that such a molded product is molded with a mold and vulcanized and bonded to the bolt 7.

The damping rubber composite 2 has one surface
Since it is covered with the cloth material 4, the strength as a vibration damping rubber material can be enhanced, and by adjusting the thickness of the cloth material 4 and the fiber material as required, conventional low load and low impact applications can be achieved. Not only can it be used for heavy loads.

Further, as shown in FIG. 4, the continuously manufactured vibration-damping rubber composite 2 shown in the above example is laminated by alternately laminating the rubber surface and the cloth material surface during storage. By doing so, it is possible to prevent the rubber from sticking to each other and impairing the product value as in the conventional case.

In the vibration damping rubber composite 2, the ratio of the thickness of the rubber portion to the thickness of the cloth material can be variously set according to the application.

As described above in detail, in the vibration damping rubber composite 2, the vibration damping rubber composition may be foamed rubber having closed cells, and two or more cloth materials 4 may be layered. Can be transformed into

[0040]

【Example】

Example 1 (Rubber foot of AV equipment) As a vibration-damping rubber composition, the glass transition point Tg is -40 to -40.
100 parts by weight of nitrile rubber polymer at -35 ° C has a softening point Sp of 80 to 90 ° C and a solubility constant SP of 1
80 parts by weight of 0 to 13 terpene phenol resin is added,
Vulcanizing agent, vulcanization accelerator, vulcanization acceleration aid, reinforcing agent, filler,
A compounding agent such as an anti-aging agent was added to make a total of 310 parts by weight. The detailed formulation is shown in Table 1.

[0041]

[Table 1]

Further, a nonwoven fabric made of polyester fiber is used as the cloth material, and the sheet-shaped vibration-damping rubber composite having a total thickness of about 3 mm is obtained by simultaneously vulcanizing and molding them with a continuous vulcanizer while closely adhering them. It was manufactured continuously.

This damping rubber composite has a loss tangent (tan).
δ) satisfied 0.5 or more in the temperature range of 0 to 40 ° C. The rubber surface of this composite is A
When it was used as a rubber leg so that it was adhered to V equipment and the cloth material was on the bottom, no rubber adhesion was found on the base, and good results were obtained.

Example 2 (Impact absorber for snowboard) A composite using the vibration-damping rubber composition for low temperature and the same cloth material as above was punched by a press according to the shape of the snowboard, and the lower plate ( It was used as a shock absorbing material by interposing it between the sliding surface) and the upper plate (on the side where the boot was mounted). Total thickness is 3
mm, the cloth thickness is 0.13 mm. In the manufacturing process,
Since the sheets are not closely attached to each other due to lamination, the product is large,
Moreover, despite the irregular shape, the shape was not deformed during the die cutting and storage. In addition, the surface is matte, improving the aesthetics of the product. Further, while the snowboard is sliding, the upper plate and the lower plate come into contact with and separate from each other, but the composite material of this example could prevent the one plate from adhering to the other plate.

Example 3 (Cushion Rubber for Chairs for Theaters) In a theater chair such as a concert hall, when the seat portion is not in use, the seat mechanism is springed up by the spring mechanism and the stopper abuts on the backrest side. When using it, pull it down and sit down. When the spectator stands up, the seat is released and automatically folds up. However, the damping rubber composite of this example is used as cushion rubber so that the stopper does not generate vibration or noise at that time.

Conventionally, problems such as noise at the time of splashing the seat portion are solved, but when not in use, the cushion rubber comes into contact with a part of the backrest side, and adheres during the contact state, A peeling noise was generated that hinders the musical environment of the theater during use. However, in the composite of the present invention, by bringing the cloth material into contact with the backrest side, it was possible to completely prevent the above-mentioned peeling noise without slightly impairing the original cushioning function.

[0047]

As described above, according to the first aspect of the invention, the vibration-damping rubber composite prevents the adhesion between the rubber and the base by using the vibration-damping rubber composite with the cloth material side facing the base. It is possible to prevent the base surface from being soiled. Moreover, it is possible to prevent the manufacturing process from becoming complicated.

Further, according to the invention of claim 2, the vibration-damping rubber composite can exert a vibration-damping effect even in a low temperature environment up to −40 ° C. As a result, for example, skis, snowboards, ski shoes, It can be preferably used as a vibration or shock absorbing material such as a gondola lift on a slope.

When the vibration-damping rubber composite is produced as a sheet material as in the third aspect of the invention, the productivity is further increased, and the sheet materials are stacked in the same direction and stored. Furthermore, it is also possible to wind up the vibration-damping rubber composite that is continuously manufactured, prevent the rubber surfaces of the composites from sticking to each other, and facilitate storage and reduce costs.

Moreover, since the vibration-damping rubber composite is reinforced by the cloth material, good punching results can be obtained, and a plurality of vibration-damping rubber composite sheets are laminated in the same direction. Thus, even if punching is performed at the same time, extremely high processing accuracy can be obtained. Further, conventionally, the vibration-damping rubber to which a polyethylene film is attached has a problem that it is often deformed if left after being punched.
The vibration-damping rubber composite of the present invention shows almost no deformation even after punching, and the dimensional accuracy can be significantly improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between loss tangent (tan δ) and temperature of a vibration damping rubber composition.

FIG. 3 is a perspective view showing an embodiment of this embodiment.

FIG. 4 is a diagram showing stacked vibration damping rubber composites.

FIG. 5 is a perspective view showing an embodiment of the present invention.

FIG. 6 is a perspective view showing another embodiment of the present invention.

FIG. 7 is a perspective view showing another embodiment of the present invention.

FIG. 8 is a perspective view illustrating a conventional technique.

[Explanation of symbols]

 2 Damping rubber composite 3 Damping rubber composition 4 Cloth t Overall thickness

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[Procedure amendment]

[Submission date] March 1, 1996

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

[0040]

Examples Example 1 (Rubber legs for AV equipment) As a vibration-damping rubber composition, the glass transition point Tg is -40 to -40.
100 parts by weight of nitrile rubber polymer at -35 ° C has a softening point Sp of 80 to 90 ° C and a solubility constant SP of 1
80 parts by weight of 0 to 13 terpene phenol resin is added,
Vulcanizing agent, vulcanization accelerator, vulcanization acceleration aid, reinforcing agent, filler,
A compounding agent such as an antioxidant was added to make a total of 311 parts by weight. The detailed formulation is shown in Table 1.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction contents]

[0041]

[Table 1]

Claims (4)

[Claims] 1. A cloth material made of fiber is attached to the surface of a vibration-damping rubber composition having a loss tangent (tan δ) of 0.5 or more in a temperature range of at least 5 to 35 ° C. Damping rubber composite. 2. The damping rubber composition has a softening point Sp of 50 to 120 ° C. with respect to 100 parts by weight of a synthetic rubber polymer.
And a solubility constant SP of 10 to 120 parts by weight of a resin having a solubility constant SP of 7.0 to 13.0, and a loss tangent (tan) in a temperature range of -40 to 40 ° C.
The vibration damping rubber composite according to claim 1, wherein δ) is 0.5 or more. 3. The vibration-damping rubber composition is formed in a long shape, and the cloth material is attached to only one surface thereof, and the total thickness of the composite is 1.0 to 3.0 mm. The damping rubber composite according to claim 1. 4. The vibration damping rubber composite according to claim 1, wherein the cloth material is attached to the vibration damping rubber composition by vulcanization of the vibration damping rubber composition.