JPH10110062A - Rubber composition for earthquake-proof laminate - Google Patents
Rubber composition for earthquake-proof laminateInfo
- Publication number
- JPH10110062A JPH10110062A JP9210934A JP21093497A JPH10110062A JP H10110062 A JPH10110062 A JP H10110062A JP 9210934 A JP9210934 A JP 9210934A JP 21093497 A JP21093497 A JP 21093497A JP H10110062 A JPH10110062 A JP H10110062A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- carbon black
- norbornene
- weight
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、振動エネルギーを
効率良く吸収することが出来、且つ長期耐久性にすぐれ
たゴム組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition capable of efficiently absorbing vibration energy and having excellent long-term durability.
【0002】[0002]
【従来の技術】近年、振動エネルギーの吸収装置、即
ち、防振、除震、免震装置などが急速に普及しつつあ
る。そして、この装置においては、減衰性能を有するゴ
ム組成物が使用されている。従来、ゴム材料に高減衰特
性を持たせるために、すなわち、高減衰特性を持ったゴ
ム組成物を得るためには、カーボンブラックや石油樹脂
を多量に配合している。2. Description of the Related Art In recent years, devices for absorbing vibration energy, that is, anti-vibration, seismic isolation, seismic isolation devices, etc., have been rapidly spreading. In this device, a rubber composition having a damping performance is used. Conventionally, a large amount of carbon black or petroleum resin is blended in order to give a rubber material high attenuation characteristics, that is, to obtain a rubber composition having high attenuation characteristics.
【0003】しかしながら、カーボンブラックの多量配
合では減衰性能は向上するが(高ヒステリシスロス)、
精練加工性が劣るとともに、免震装置のせん断破壊特性
が低下する欠点がある。一方、石油樹脂の多量配合で
も、減衰特性は向上するが、クリープ特性が低下し、長
期耐久性に劣るという欠点があった。However, when a large amount of carbon black is blended, the damping performance is improved (high hysteresis loss).
There are disadvantages that the refining workability is inferior and the shear fracture characteristics of the seismic isolation device are reduced. On the other hand, even when a large amount of a petroleum resin is blended, the damping properties are improved, but the creep properties are reduced, and the long-term durability is poor.
【0004】[0004]
【発明が解決しようとする課題】本発明の目的は、振動
エネルギー吸収性及び長期耐久性に優れた免震積層体用
ゴム組成物を提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber composition for a seismic isolation laminate excellent in vibration energy absorption and long-term durability.
【0005】[0005]
【課題を解決するための手段】本発明の免震積層体用ゴ
ム組成物は、天然ゴムを主成分とするゴム100重量部
に対し、ノルボルネン加硫粉砕ゴム5〜30重量部、石
油樹脂15〜60重量部、および微粒子カーボンブラッ
ク50〜90重量部を含んでなることを特徴とする。According to the rubber composition for a seismic isolation laminate of the present invention, 5 to 30 parts by weight of a norbornene vulcanized and pulverized rubber and petroleum resin 15 are added to 100 parts by weight of a rubber mainly composed of natural rubber. ~ 60 parts by weight and 50-90 parts by weight of fine carbon black.
【0006】このように天然ゴム(NR)、ノルボルネ
ン加硫粉砕ゴム、石油樹脂、および微粒子カーボンブラ
ックを組み合わせて用いるため、振動エネルギー吸収性
及び長期耐久性を向上させることが可能となる。As described above, since natural rubber (NR), norbornene vulcanized and ground rubber, petroleum resin, and fine carbon black are used in combination, vibration energy absorption and long-term durability can be improved.
【0007】[0007]
【発明の実施の形態】図1は、免震積層体の一例を示す
断面説明図である。図1において、免震積層体1はゴム
組成物2が鋼板等の剛性を有する硬質板3を介して複数
層積層した構造となっている。本発明では、図1におけ
るゴム組成物2として、天然ゴム(NR)、ノルボルネ
ン加硫粉砕ゴム、石油樹脂、および微粒子カーボンブラ
ックからなるゴム組成物を用いるのである。FIG. 1 is an explanatory sectional view showing an example of a seismic isolation laminate. In FIG. 1, the seismic isolation laminate 1 has a structure in which a plurality of rubber compositions 2 are laminated via a hard plate 3 having rigidity such as a steel plate. In the present invention, a rubber composition composed of natural rubber (NR), norbornene vulcanized pulverized rubber, petroleum resin, and fine carbon black is used as the rubber composition 2 in FIG.
【0008】天然ゴム(NR)としては、市販されてい
るいずれのものを用いてもよい。NRの他に、イソプレ
ンゴム(IR)、スチレン−ブタジエン共重合体ゴム
(SBR)、ブタジエンゴム(BR)等のゴムを配合し
てもよい。ノルボルネン加硫粉砕ゴムは、下記式で示さ
れるようにノルボルネンを開環重合させて得られるポリ
ノルボルネンに対し、カーボンブラック、シリカ等の補
強剤、タルク、クレー等の充填剤、樹脂、伸展油〔特
に、石油系の伸展油(芳香族系油、ナフテン油、パラフ
ィン油等)が好ましい〕、硫黄等の加硫剤、TT(Tetr
amethyl thiuram disulfide)、TBT(Tetrabuthyl th
iuram disulfide)等の加硫促進剤、および亜鉛華、ステ
アリン酸等の加硫助剤を適宜配合し、加硫した後、粉砕
して得られる。その粉砕方法は、その粉砕品の粒子径が
250μm以下であればいずれの方法でもよく、その代
表例としては、凍結乾燥後、粉砕機で粉砕する方法があ
る。[0008] As the natural rubber (NR), any commercially available natural rubber may be used. In addition to NR, rubber such as isoprene rubber (IR), styrene-butadiene copolymer rubber (SBR), and butadiene rubber (BR) may be blended. Norbornene vulcanized pulverized rubber is a polynorbornene obtained by ring-opening polymerization of norbornene as shown by the following formula, carbon black, reinforcing agents such as silica, fillers such as talc, clay, resin, extending oil [ Particularly preferred are petroleum-based extender oils (aromatic oils, naphthenic oils, paraffin oils, etc.), vulcanizing agents such as sulfur, TT (Tetr
amethyl thiuram disulfide), TBT (Tetrabuthyl th
It is obtained by appropriately mixing a vulcanization accelerator such as iuram disulfide) and a vulcanization aid such as zinc white and stearic acid, vulcanizing and then pulverizing. The pulverization method may be any method as long as the particle size of the pulverized product is 250 μm or less. A typical example is a method of freeze-drying and then pulverizing with a pulverizer.
【0009】このポリノルボルネンとしては、日本ゼオ
ン(株)製の“ノーソレックス”が挙げられる。As the polynorbornene, "NOSOLEX" manufactured by ZEON CORPORATION can be mentioned.
【0010】[0010]
【化1】 Embedded image
【0011】石油樹脂は、いわゆる石油ナフサを熱分解
後、蒸留によって分画されて得られるインデン、α−メ
チルスチレンなどの重合成分を含むC9 〜C10 留分を
カチオン重合させて得られる樹脂であり、FTR(三井
石油化学工業(株))、ハイレジン(東邦化学工業
(株))、クマロン樹脂(新日鐡化学社製)などとして
市販されているものである。The petroleum resin is a resin obtained by subjecting a so-called petroleum naphtha to pyrolysis and then subjecting a C 9 -C 10 fraction containing polymerizable components such as indene and α-methylstyrene obtained by fractionation by distillation to cationic polymerization. And are commercially available as FTR (Mitsui Petrochemical Industries, Ltd.), High Resin (Toho Chemical Industry Co., Ltd.), Coumarone resin (Nippon Steel Chemical Co., Ltd.), and the like.
【0012】本発明で使用する微粒子カーボンブラック
は窒素比表面積が通常60〜150m2 /g、特には80
〜150 m2 /gであり、DBP吸油量が通常60〜16
0cm 3 / 100g、特には90〜160cm3 / 100g
のものが好ましい。このようなものはASTMで示され
るHAF、ISAF、SAFタイプのカーボンブラック
として市販されており、使用することができる。Fine carbon black used in the present invention
Has a nitrogen specific surface area of usually 60 to 150 mTwo/ g, especially 80
~ 150 mTwo/ g and DBP oil absorption is usually 60 to 16
0cm Three/ 100g, especially 90-160cmThree/ 100g
Are preferred. Such is indicated by ASTM
HAF, ISAF, SAF type carbon black
It is commercially available as and can be used.
【0013】本発明では、NRを主成分とするゴム10
0重量部に対し、ノルボルネン加硫粉砕ゴム5〜30重
量部、石油樹脂15〜60重量部、および微粒子カーボ
ンブラック50〜90重量部を配合する。ノルボルネン
加硫粉砕ゴムが5重量部未満では得られるゴム組成物の
減衰性が不足し、30重量部超では強度低下、弾性率の
低下となる。石油樹脂が15重量部未満では振動エネル
ギーの吸収能が不足し、60重量超ではクリープ大とな
る。微粒子カーボンブラックが50重量部未満では振動
エネルギーの吸収能に劣り、90重量部超では本発明の
ゴム組成物の製造の際に加工性が低下し製造上好ましく
なく、又強度も低下する。In the present invention, the rubber 10 containing NR as a main component is used.
With respect to 0 parts by weight, 5 to 30 parts by weight of norbornene vulcanized and ground rubber, 15 to 60 parts by weight of petroleum resin, and 50 to 90 parts by weight of fine carbon black are blended. If the amount of the norbornene vulcanized and ground rubber is less than 5 parts by weight, the obtained rubber composition will have insufficient damping property, and if it exceeds 30 parts by weight, the strength and elastic modulus will be reduced. If the petroleum resin is less than 15 parts by weight, the ability to absorb vibration energy is insufficient, and if it exceeds 60 parts by weight, the creep becomes large. If the amount of the fine carbon black is less than 50 parts by weight, the ability to absorb vibration energy is inferior.
【0014】本発明のゴム組成物を製造するに当って
は、未加硫ゴムの加硫の目的でN−シクロヘキシル−2
−ベンゾチアゾリルスルフェンアミド、N−t−ブチル
−2−ベンゾチアゾリルスルフェンアミドなどの加硫促
進剤および亜鉛華、ステアリン酸などの加硫助剤が未加
硫ゴムに適切量配合される。本発明のゴム組成物を免震
積層体に適用した場合の一例を図1に示したが、本発明
のゴム組成物2と例えば一般構造用鋼板、冷間圧延鋼板
などからなる硬質板3とが交互に積層されて免震積層体
が構成される。この積層体を製造するには、成形・加硫
して、シート状のゴム組成物を得た後、接着剤により硬
質板と接着してもよいし、またあらかじめ未加硫のゴム
配合物をシート状に成形し、硬質板と積層した後に加熱
して加硫・接着を同時に行って製造することもできる。In producing the rubber composition of the present invention, N-cyclohexyl-2 is used for the purpose of vulcanizing an unvulcanized rubber.
Vulcanization accelerators such as benzothiazolylsulfenamide and Nt-butyl-2-benzothiazolylsulfenamide and vulcanization aids such as zinc white and stearic acid are added to unvulcanized rubber in an appropriate amount. You. One example in which the rubber composition of the present invention is applied to a seismic isolation laminate is shown in FIG. 1, but the rubber composition 2 of the present invention and a hard plate 3 made of, for example, a general structural steel plate, a cold-rolled steel plate, etc. Are alternately laminated to form a seismic isolation laminate. In order to manufacture this laminated body, after molding and vulcanizing to obtain a sheet-like rubber composition, it may be bonded to a hard plate with an adhesive, or an unvulcanized rubber compound may be prepared in advance. It can also be manufactured by forming into a sheet, laminating it with a hard plate, and then heating and simultaneously vulcanizing and bonding.
【0015】このような免震積層体は、例えば、道路橋
の支承や、ビルの基礎支承の用途に用いることができ
る。Such a seismic isolation laminate can be used, for example, as a support for a road bridge or a foundation for a building.
【0016】[0016]
【実施例】表2に示す配合内容(重量部)でゴム組成物
を作製した(実施例1〜3、比較例1)。これらのゴム
組成物につき、下記により引張強度(TB )、破断伸び
(EB )、JIS A 硬度(Hs)を評価した。また、ゴムと鉄
板を交互に積層した図1の免震積層体(サイズ135mm
×135mm×74mm)を作製し、等価減衰定数
(h eq)、およびクリープ性(橋の設計供用年数に相当
するクリープ量)をそれぞれ評価した。ここで、等価減
衰定数(heq)は振動エネルギー吸収性能を表わす。こ
の結果を表2に示す。EXAMPLES Rubber compositions having the contents (parts by weight) shown in Table 2
(Examples 1 to 3 and Comparative Example 1). These rubber
For the composition, the tensile strength (TB), Elongation at break
(EB), JIS A hardness (Hs) was evaluated. Also rubber and iron
The seismic isolation laminate of Fig. 1 (size 135mm)
× 135mm × 74mm) and the equivalent damping constant
(H eq) And creep properties (equivalent to the design service life of the bridge)
Creep amount). Where the equivalent
Decay constant (heq) Indicates vibration energy absorption performance. This
Table 2 shows the results.
【0017】引張強さ(TB 、kgf/cm2 ):JIS K 6301
によって測定した。数値の大きい方が強度が大きく、
破断しにくい。破断伸び(EB 、%) :JIS K 6301 によって測定し
た。[0017] The tensile strength (T B, kgf / cm 2 ): JIS K 6301
Was measured by The larger the value, the greater the strength,
Hard to break. Elongation at break (E B ,%) : Measured according to JIS K6301.
【0018】等価減衰定数(heq ):2軸せん断試験機
により、0.5 Hz 、175 %歪時の条件にて求めた。橋梁
の免震装置として用いられる高減衰ゴム支承は、設計で
期待する橋の減衰定数が得られるような地震時エネルギ
ー吸収能力を有する必要がある。免震設計の基本となる
「道路橋の免震設計法マニュアル(建設省(財)土木研
究センター)」では、橋の減衰定数に基づく設計水平震
度の補正係数は下記の表1のとおりとなっており、橋と
して地震時の震動を8割程度にすること(地震時のエネ
ルギーを2割ほど吸収すること)が望まれている。 Equivalent damping constant (h eq ): Determined by a biaxial shear tester under the conditions of 0.5 Hz and 175% strain. A high-damping rubber bearing used as a seismic isolation device for a bridge must have an energy absorption capacity during an earthquake that can obtain the expected damping constant of the bridge in the design. According to the "Seismic Isolation Design Manual for Road Bridges (Ministry of Construction, Civil Engineering Research Center)" which is the basis of seismic isolation design, the correction coefficient of the design horizontal seismic intensity based on the damping constant of the bridge is as shown in Table 1 below. As a bridge, it is desired that the vibration during an earthquake be reduced to about 80% (to absorb about 20% of the energy during an earthquake).
【0019】[0019]
【表1】 [Table 1]
【0020】また、高減衰ゴム支承の等価減衰定数はせ
ん断ひずみの増加に伴って減少する傾向にあり、保有水
平耐力法レベルで期待できる橋の減衰定数は0.12〜0.15
が妥当である。それ故、これを満足する対象ひずみレベ
ルでの高減衰ゴム支承に要求される等価減衰定数は0.13
程度以上となる。The equivalent damping constant of a high damping rubber bearing tends to decrease with an increase in shear strain, and the damping constant of a bridge expected at the level of the retained horizontal strength method is 0.12 to 0.15.
Is appropriate. Therefore, the equivalent damping constant required for a high damping rubber bearing at the target strain level to satisfy this is 0.13
Or more.
【0021】クリープ性(%):温度+20℃で、設計
支圧応力度(60kgf/cm2 )に相当する鉛直荷重を10
00時間作用させた場合に免震装置に生じる鉛直変位を
もとに、式(1)から橋の設計供用年数に相当するクリ
ープを求める。 δCR=atb (1) ここに、 δCR:免震装置のクリープ変形量(mm) t :橋の設計供用年数(時間) a,b :クリープ定数で、式(2)および式(3)より算
出する。 Creep (% ): At a temperature of + 20 ° C., a vertical load corresponding to the design bearing stress (60 kgf / cm 2 ) is increased by 10 %.
Based on the vertical displacement that occurs in the seismic isolation device when it is operated for 00 hours, creep corresponding to the design service life of the bridge is obtained from equation (1). δ CR = at b (1) where, δ CR : creep deformation of seismic isolation device (mm) t: design service life of bridge (hours) a, b: creep constant, Equations (2) and (3) ).
【0022】 a =(δ100 )2 /(δ1000)2 (2) b = log(δ1000/δ100 ) (3) δ100 :100時間後に生じる免震装置の鉛直変位(m
m) δ1000:1000時間後に生じる免震装置の鉛直変位
(mm) 式(1)で算出した橋の設計供用年数に相当するクリー
プ量は、ゴム総厚の5%以下でなければならない。A = (δ 100 ) 2 / (δ 1000 ) 2 (2) b = log (δ 1000 / δ 100 ) (3) δ 100 : Vertical displacement of the seismic isolation device occurring after 100 hours (m
m) [delta] 1000: vertical displacement (mm) Equation (1) creep amount that corresponds to the design working life of the bridge calculated by the seismic isolation device that occurs after 1000 hours shall not exceed 5% of the rubber total thickness.
【0023】[0023]
【表2】 [Table 2]
【0024】表2から明らかなように、本発明ゴム組成
物(実施例1〜3)は、比較例1のゴム組成物に比し
て、振動エネルギー吸収性、長期耐久性に優れているこ
とが判る。As is clear from Table 2, the rubber composition of the present invention (Examples 1 to 3) is superior to the rubber composition of Comparative Example 1 in vibration energy absorption and long-term durability. I understand.
【0025】[0025]
【発明の効果】以上説明したように本発明の免震積層体
用ゴム組成物は、天然ゴムを主成分とするゴム100重
量部に対し、ノルボルネン加硫粉砕ゴム5〜30重量
部、石油樹脂15〜60重量部、および微粒子カーボン
ブラック50〜90重量部を含んでなるため、振動エネ
ルギー吸収性、長期耐久性に優れるものである。As described above, the rubber composition for a seismic isolation laminate of the present invention comprises 5 to 30 parts by weight of norbornene vulcanized and pulverized rubber and 100 parts by weight of a rubber mainly composed of natural rubber. Since it contains 15 to 60 parts by weight and 50 to 90 parts by weight of fine carbon black, it has excellent vibration energy absorption and long-term durability.
【図1】免震積層体の一例を示す断面説明図である。FIG. 1 is an explanatory sectional view showing an example of a seismic isolation laminate.
1 免震積層体 2 ゴム組成物 3 硬質板 DESCRIPTION OF SYMBOLS 1 Seismic isolation laminated body 2 Rubber composition 3 Hard plate
フロントページの続き (51)Int.Cl.6 識別記号 FI C08L 45:00 57:02) Continued on the front page (51) Int.Cl. 6 Identification code FI C08L 45:00 57:02)
Claims (2)
部に対し、ノルボルネン加硫粉砕ゴム5〜30重量部、
石油樹脂15〜60重量部、および微粒子カーボンブラ
ック50〜90重量部を含んでなる免震積層体用ゴム組
成物。1 to 5 parts by weight of norbornene vulcanized and pulverized rubber per 100 parts by weight of a rubber mainly composed of natural rubber,
A rubber composition for a seismic isolation laminate comprising 15 to 60 parts by weight of a petroleum resin and 50 to 90 parts by weight of fine carbon black.
面積60〜150m 2 /g、DBP吸油量60〜160c
m3 /100gを有する請求項1記載の免震積層体用ゴ
ム組成物。2. The fine particle carbon black according to claim 1, wherein
Area 60-150m Two/ G, DBP oil absorption 60-160c
mThree2. The base for a seismic isolation laminate according to claim 1, wherein
Composition.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9210934A JPH10110062A (en) | 1996-08-13 | 1997-08-05 | Rubber composition for earthquake-proof laminate |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21365996 | 1996-08-13 | ||
JP8-213659 | 1996-08-13 | ||
JP9210934A JPH10110062A (en) | 1996-08-13 | 1997-08-05 | Rubber composition for earthquake-proof laminate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH10110062A true JPH10110062A (en) | 1998-04-28 |
Family
ID=26518343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9210934A Pending JPH10110062A (en) | 1996-08-13 | 1997-08-05 | Rubber composition for earthquake-proof laminate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH10110062A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000212334A (en) * | 1998-11-20 | 2000-08-02 | Yokohama Rubber Co Ltd:The | Rubber composition for vibration damping machine |
JP2022118764A (en) * | 2021-02-03 | 2022-08-16 | 鬼怒川ゴム工業株式会社 | Vibration-proof rubber composition, and vibration-proof rubber |
-
1997
- 1997-08-05 JP JP9210934A patent/JPH10110062A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000212334A (en) * | 1998-11-20 | 2000-08-02 | Yokohama Rubber Co Ltd:The | Rubber composition for vibration damping machine |
JP2022118764A (en) * | 2021-02-03 | 2022-08-16 | 鬼怒川ゴム工業株式会社 | Vibration-proof rubber composition, and vibration-proof rubber |
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