Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1998-10-08
2000-08-22
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C08K 304
Patent
active
06107389&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rubber composition for base isolation laminates which can efficiently absorb vibration energy and is excellent in long-term endurance.
BACKGROUND ART
Various equipment for absorbing vibrational energy such as vibration isolators, vibration dampers or seismic isolators have recently been spread rapidly. Further, rubber compositions exhibiting a damping power (absorbing power) against vibrational energy are used in such equipment.
As means for imparting excellent damping characteristics to a rubber material, i.e., obtaining a rubber composition having excellent damping characteristics, it has been a common practice to add a large amount of carbon black or a petroleum resin to a rubber.
However, the addition of a large amount of carbon black had disadvantages in that the resulting composition was poor in processability in refining and that the resulting seismic isolator was poor in shear failure characteristics, though the resulting composition exhibited an enhanced damping capacity (i.e., an enhanced hysteresis loss). On the other hand, the addition of a large amount of a petroleum resin had a disadvantage in that the resulting rubber composition exhibited lowered creep characteristics and was poor in long-term endurance, though the composition was improved in damping characteristics.
DISCLOSURE OF INVENTION
The present invention aims at providing a rubber composition for base isolation laminates which is excellent in vibrational energy absorbing properties and long-term endurance.
In order to attain this aim, the rubber composition for base isolation laminates according to the present invention is characterized by comprising 100 parts by weight of a rubber component comprising 90 to 50 parts by weight of a natural rubber and/or an isoprene rubber and 10 to 50 parts by weight of a polybutadiene rubber composite, 15 to 60 parts by weight of a petroleum resin and 50 to 90 parts by weight of fine particulate carbon black, the polybutadiene rubber composite comprising 97 to 80% by weight of a cis-1,4-polybutadiene rubber having a cis-1,4-linkage content of 90% or above and 3 to 20% by weight of a syndiotactic 1,2-polybutadiene.
Such a combination of a natural rubber (NR) and/or an isoprene rubber (IR) with a polybutadiene rubber composite (BR composite), a petroleum resin and fine particulate carbon black makes it possible to obtain a rubber composition improved in vibrational energy absorbing properties and long-term endurance.
BRIEF DESCRIPTION OF DRAWING
FIG. 1 is a sectional view illustrating an example of the base isolation laminate.
BEST MODE FOR CARRYING OUT THE INVENTION
In FIG. 1, a base isolation laminate 1 has a structure wherein a plurality of sheets of a rubber composition 2 are laminated with rigid hard plates 3 (e.g., steel sheets) sandwiched among the sheets.
The rubber composition of the present invention comprising a natural rubber (NR) and/or an isoprene rubber (IR), a polybutadiene rubber composite (BR composite), a petroleum resin and fine particulate carbon black is used as the rubber composition 2 shown in FIG. 1.
In the present invention, 100 parts by weight of a rubber component comprising 90 to 50 parts by weight of NR and/or IR and 10 to 50 parts by weight of the BR composite is blended with 15 to 60 parts by weight of a petroleum resin and 50 to 90 parts by weight of fine particulate carbon black.
When the amount of NR and/or IR added exceeds 90 parts by weight, the resulting rubber composition will be poor in elongation, while when it is less than 50 parts by weight, the composition will be poor in processability and damping capacity. The term "NR and/or IR" used in this description refers to the use of either NR or IR or that of both NR and IR.
The polybutadiene rubber composite (BR composite) comprises 97 to 80% by weight of a cis-1,4-polybutadiene rubber having a cis-1,4-linkage content of 90% or above and 3 to 20% by weight of a syndiotactic (syn) 1,2-polybutadiene. The BR composition is commercially available, for e
REFERENCES:
patent: 4452960 (1984-06-01), Throckmorton
patent: 4592550 (1986-06-01), Horiuchi
patent: 4824899 (1989-04-01), Yasuda
patent: 5247009 (1993-09-01), Kitahara
patent: 5299615 (1994-04-01), Ataka
Murakoshi Akio
Oishi Hideyuki
Michl Paul R.
The Yokohama Rubber Co. Ltd.
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