JPH101566A - Rubber composition - Google Patents
Rubber compositionInfo
- Publication number
- JPH101566A JPH101566A JP15796596A JP15796596A JPH101566A JP H101566 A JPH101566 A JP H101566A JP 15796596 A JP15796596 A JP 15796596A JP 15796596 A JP15796596 A JP 15796596A JP H101566 A JPH101566 A JP H101566A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- saturated hydrocarbon
- hydrocarbon resin
- rubber composition
- shear modulus
- 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 42
- 239000005060 rubber Substances 0.000 title claims abstract description 42
- 239000000203 mixture Substances 0.000 title claims abstract description 19
- 239000013032 Hydrocarbon resin Substances 0.000 claims abstract description 18
- 229920006270 hydrocarbon resin Polymers 0.000 claims abstract description 18
- 229930195734 saturated hydrocarbon Natural products 0.000 claims abstract description 18
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 7
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 7
- 229920001194 natural rubber Polymers 0.000 claims abstract description 7
- 125000002723 alicyclic group Chemical group 0.000 abstract description 13
- 238000007906 compression Methods 0.000 abstract description 11
- 230000006835 compression Effects 0.000 abstract description 11
- 208000032843 Hemorrhage Diseases 0.000 abstract description 6
- 208000034158 bleeding Diseases 0.000 abstract description 6
- 230000000740 bleeding effect Effects 0.000 abstract description 6
- 238000002156 mixing Methods 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002955 isolation Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000004073 vulcanization Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000010734 process oil Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229920003049 isoprene rubber Polymers 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 235000001508 sulfur Nutrition 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、防振ゴムや免震ア
イソレータに用いられる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 used for a vibration-isolating rubber and a seismic isolation isolator.
【0002】[0002]
【従来の技術】近時、建築物や構造物などに長い固有周
期を与えることのできる免震アイソレータの要求が高ま
っており、それにともない、剪断弾性率の低いゴム材料
の開発が求められている。2. Description of the Related Art In recent years, there has been an increasing demand for seismic isolation isolators capable of giving a long natural period to buildings and structures, and accordingly, there has been a demand for the development of rubber materials having a low shear modulus. .
【0003】すなわち、免震構造の固有周期Tは、一般
に次式 T= 2π(m/k)1/2 (但し、mは構造物の質量、kは免震アイソレータのば
ね定数を表す。)で与えられ、また、ばね定数kは、一
般に次式 k=GA/nt (但し、Gはゴムの剪断弾性率、Aは免震アイソレータ
の断面積、nはゴム層数、tは 1層あたりのゴム厚を表
す。)で求められる。That is, the natural period T of the seismic isolation structure is generally expressed by the following equation: T = 2π (m / k) 1/2 (where m represents the mass of the structure and k represents the spring constant of the seismic isolation isolator) The spring constant k is generally given by the following equation: k = GA / nt (where G is the shear modulus of rubber, A is the cross-sectional area of the seismic isolation isolators, n is the number of rubber layers, and t is Of the rubber.).
【0004】したがって、固有周期を長くするには、剪
断弾性率の低いゴム材料を用いればよい。Therefore, in order to lengthen the natural period, a rubber material having a low shear modulus may be used.
【0005】ところで、ゴム材料の剪断弾性率を低くす
る方法としては、プロセスオイルや可塑剤などを配合す
る方法が一般に知られている。As a method for lowering the shear modulus of a rubber material, a method of blending a process oil, a plasticizer, or the like is generally known.
【0006】しかしながら、この方法では、圧縮永久歪
みやクリープ特性などが低下するおそれがあるうえ、配
合剤が常温で液状のものであるため、多量に配合すると
ゴム表面から滲み出て特性を低下させる、いわゆるブリ
ード現象を生ずるという難点がある。このようなブリー
ド現象は、大きな鉛直荷重の加わる免震アイソレータや
防振ゴムにとって特に問題となるものである。However, in this method, compression set and creep characteristics may be reduced, and since the compounding agent is liquid at room temperature, if it is compounded in a large amount, it exudes from the rubber surface to deteriorate the characteristics. Bleeding phenomenon. Such a bleed phenomenon is particularly problematic for seismic isolation isolators and vibration isolating rubbers to which a large vertical load is applied.
【0007】[0007]
【発明が解決しようとする課題】このように、近時、防
振ゴムや免震アイソレータに用いるゴム組成物として、
剪断弾性率の低いものが要求されているが、圧縮永久歪
みやクリープ特性が不十分であったり、あるいは、配合
剤のブリードのおそれがあるなど、未だ満足すべきもの
が得られていないのが実状である。As described above, recently, as a rubber composition used for a vibration isolating rubber or a seismic isolation isolator,
Although a material with a low shear modulus is required, satisfactory properties have not yet been obtained, such as inadequate compression set and creep properties, or bleeding of the compounding agent. It is.
【0008】本発明はこのような点に対処してなされた
もので、剪断弾性率が低く、しかも、ブリードの発生の
おそれがなく、また、圧縮永久歪みやクリープ特性その
他の特性も良好なゴム組成物を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and has a low shear modulus, no risk of bleeding, and excellent compression set, creep characteristics and other properties. It is intended to provide a composition.
【0009】[0009]
【課題を解決するための手段】本発明のゴム組成物は、
ゴム 100重量部に対し、脂肪族系環状飽和炭化水素樹脂
(以下、脂環族飽和炭化水素樹脂と称する。)を 1〜30
重量部配合してなることを特徴としている。Means for Solving the Problems The rubber composition of the present invention comprises:
Aliphatic cyclic saturated hydrocarbon resin (hereinafter referred to as alicyclic saturated hydrocarbon resin) is used in 1 to 30 parts by weight per 100 parts by weight of rubber.
It is characterized by being blended by weight.
【0010】本発明に使用されるゴムは、特に限定され
るものではなく、天然ゴム(NR)をはじめ、スチレン
ブタジエンゴム(SBR)、イソプレンゴム(IR)、
クロロプレンゴム(CR)、ブチルゴム、ブタジエンゴ
ム(BR)、アクリロニトリルブタジエンゴムなどの各
種合成ゴムを使用することができるが、なかでも、クリ
ープ特性などの良好な天然ゴムの使用が望ましく、他の
合成ゴムを併用する場合には、少なくとも天然ゴムがゴ
ム全体の50重量%以上配合されるようにすることが望ま
しい。The rubber used in the present invention is not particularly limited, and includes natural rubber (NR), styrene butadiene rubber (SBR), isoprene rubber (IR),
Various synthetic rubbers such as chloroprene rubber (CR), butyl rubber, butadiene rubber (BR), and acrylonitrile butadiene rubber can be used. Among them, use of natural rubber having good creep characteristics is desirable, and other synthetic rubbers are preferable. When used together, it is desirable that at least 50% by weight or more of the natural rubber be blended with the entire rubber.
【0011】また、本発明において、このようなゴムに
配合する脂環族飽和炭化水素樹脂は、常温で固体のもの
であり、脂環族飽和炭化水素樹脂として一般に知られる
もののなかから 1種以上を任意に選択して使用すること
ができる。本発明においては、なかでも、軟化点が 25
〜160 ℃の範囲のものが好ましく、軟化点が25℃未満の
ものでは、表面にブリードするおそれがあり、逆に 160
℃を越えるものでは、剪断弾性率の低下が不十分とな
る。具体的には、荒川化学工業社製のアルコンP-70、ア
ルコンP-90、アルコンP-100 、アルコンP-115 、アルコ
ンP-125 、アルコンP-140 (以上、いずれも商品名)な
どが好適に使用される。In the present invention, the alicyclic saturated hydrocarbon resin to be mixed with such a rubber is a solid at room temperature, and is one or more of those generally known as alicyclic saturated hydrocarbon resins. Can be arbitrarily selected and used. In the present invention, among others, the softening point is 25%.
160160 ° C. is preferred. If the softening point is less than 25 ° C., the surface may bleed.
If the temperature exceeds ℃, the reduction of the shear modulus becomes insufficient. Specifically, Alcon P-70, Alcon P-90, Alcon P-100, Alcon P-115, Alcon P-125, and Alcon P-140 (all of which are trade names) manufactured by Arakawa Chemical Industries, Ltd. It is preferably used.
【0012】本発明においては、このような脂環族飽和
炭化水素樹脂を、ゴム 100重量部に対し、 1〜30重量部
の割合で配合する。脂環族飽和炭化水素樹脂の配合量
が、ゴム 100重量部に対し 1重量部未満では、剪断弾性
率を十分に低下させることができず、逆に30重量部を越
えると、引張強さなどの特性が不十分となる。In the present invention, such an alicyclic saturated hydrocarbon resin is blended at a ratio of 1 to 30 parts by weight with respect to 100 parts by weight of the rubber. If the amount of the alicyclic saturated hydrocarbon resin is less than 1 part by weight per 100 parts by weight of rubber, the shear modulus cannot be sufficiently reduced, and if it exceeds 30 parts by weight, the tensile strength, etc. Becomes insufficient.
【0013】本発明のゴム組成物においては、上記各成
分のほか、通常ゴムに配合されるフェライト粉末、カー
ボンブラックなどの充填剤、老化防止剤、加工助剤、加
硫促進剤、加硫促進助剤などの添加剤を、本発明の効果
を阻害しない範囲で配合することができる。In the rubber composition of the present invention, in addition to the above components, fillers such as ferrite powder and carbon black which are usually compounded in rubber, antioxidants, processing aids, vulcanization accelerators, vulcanization accelerators Additives such as auxiliaries can be added within a range that does not impair the effects of the present invention.
【0014】本発明のゴム組成物においては、脂環族飽
和炭化水素樹脂の配合によって、圧縮永久歪みやクリー
プ特性を低下させることなく、剪断弾性率を低下させる
ことができ、しかも、脂環族飽和炭化水素樹脂は常温で
固体であるため、従来のプロセスオイルなどのような表
面へのブリードが生ずることもない。したがって、剪断
弾性率が低く、かつ、ブリードの発生のおそれがないう
え、圧縮永久歪みやクリープ特性などの特性にも優れた
ものとなる。In the rubber composition of the present invention, the addition of the alicyclic saturated hydrocarbon resin can reduce the shear modulus without lowering the compression set and creep properties, Since the saturated hydrocarbon resin is solid at room temperature, it does not bleed to the surface as in conventional process oils. Accordingly, the shear modulus of elasticity is low, there is no risk of bleeding, and excellent properties such as compression set and creep properties are obtained.
【0015】[0015]
【発明の実施の形態】以下、実施例により本発明をさら
に詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples.
【0016】実施例1〜5 天然ゴム(SMR CV-60 )と、ビニルトルエンとインデン
とを主重合成分として重合した後、水素添加して得られ
た脂環族飽和炭化水素樹脂(数平均分子量 860、軟化点
140℃)と、カーボンブラック(中部カーボン社製 商
品名 HTC #80)と、ステアリン酸と、亜鉛華と、硫黄、
および加硫促進剤とを、表1に示す割合でニーダーを用
いて均一に混合してゴム組成物を得た。Examples 1 to 5 An alicyclic saturated hydrocarbon resin (number average molecular weight) obtained by polymerizing natural rubber (SMR CV-60), vinyltoluene and indene as main polymerization components and then hydrogenating the same. 860, softening point
140 ° C), carbon black (Chubu Carbon Co., Ltd., product name HTC # 80), stearic acid, zinc white, sulfur,
The vulcanization accelerator and the vulcanization accelerator were uniformly mixed at a ratio shown in Table 1 using a kneader to obtain a rubber composition.
【0017】次いで、得られたゴム組成物について、JI
S K 6301規定の低伸長応力試験、圧縮永久歪み試験、お
よび引張試験を行い、25% 低伸長応力、圧縮永久歪み
率、引張強さおよび伸びを測定した。また、剪断弾性率
を低伸長応力試験により求めた25% 低伸長応力の値より
JIS K 6386(6) に基づいて算出した。これらの結果を表
1に示す。Next, the obtained rubber composition was
A low elongation stress test, a compression set test and a tensile test specified in SK 6301 were performed, and a 25% low elongation stress, a compression set rate, a tensile strength and an elongation were measured. In addition, the shear modulus was determined from the value of 25% low elongation stress obtained by the low elongation stress test.
Calculated based on JIS K 6386 (6). Table 1 shows the results.
【0018】なお、低伸長応力試験および引張試験は、
150℃×30分の条件で加硫して得た上記ゴム組成物の試
料シートについて、また、圧縮永久歪み試験は、 150℃
×40分の条件で加硫して得た試料シートについて行っ
た。Incidentally, the low elongation stress test and the tensile test
For a sample sheet of the rubber composition obtained by vulcanization under the conditions of 150 ° C. × 30 minutes, the compression set test was performed at 150 ° C.
The test was performed on a sample sheet obtained by vulcanization under the conditions of × 40 minutes.
【0019】比較例1〜5 また、比較例として、脂環族飽和炭化水素樹脂を未配合
とした例(比較例1)、脂環族飽和炭化水素樹脂を過剰
に配合した例(比較例2)、脂環族飽和炭化水素樹脂に
代えてプロセスオイル(日本石油社製 商品名コーモレ
ックス 2号)を配合した例(比較例3〜5)について、
実施例と同様の特性評価試験を行った。結果を各成分の
配合比とともに表1に併せ示す。Comparative Examples 1 to 5 As comparative examples, examples in which an alicyclic saturated hydrocarbon resin was not blended (Comparative Example 1) and examples in which an alicyclic saturated hydrocarbon resin was excessively blended (Comparative Example 2) ), Examples (Comparative Examples 3 to 5) in which a process oil (commercial No. 2 manufactured by Nippon Oil Co., Ltd.) was blended instead of the alicyclic saturated hydrocarbon resin
The same property evaluation test as in the example was performed. The results are shown in Table 1 together with the mixing ratio of each component.
【0020】[0020]
【表1】 表1からも明らかなように、本発明にかかるゴム組成物
は、圧縮永久歪み特性や引張強さを低下させることな
く、低剪断弾性率を実現することができていたのに対
し、脂環族飽和炭化水素樹脂を過剰に配合した比較例2
では、引張強さの低下が、また、プロセスオイルを配合
した比較例3〜5では、圧縮永久歪み特性の低下がみら
れた。[Table 1] As is clear from Table 1, the rubber composition according to the present invention was able to realize a low shear modulus without lowering the compression set characteristics and the tensile strength. Comparative Example 2 in which aromatic saturated hydrocarbon resin was excessively blended
In Comparative Examples 3 to 5, in which the tensile strength decreased, and in Comparative Examples 3 to 5 in which the process oil was blended, the compression set characteristics decreased.
【0021】[0021]
【発明の効果】以上の実施例からも明らかなように、本
発明のゴム組成物によれば、ゴムに対し、脂環族飽和炭
化水素樹脂を所定の割合で配合するようにしたので、圧
縮永久歪み特性やクリープ特性などゴムが本来有する優
れた特性を低下させることなく、剪断弾性率が低くする
ことができ、しかも、ブリードが発生するおそれもな
い。したがって、低剪断弾性率が要求される防振ゴムや
免震アイソレータ用ゴム組成物として有用である。As is clear from the above examples, according to the rubber composition of the present invention, the alicyclic saturated hydrocarbon resin is blended with the rubber at a predetermined ratio. The shear modulus can be reduced without deteriorating the excellent properties inherent in rubber, such as permanent set properties and creep properties, and there is no risk of bleeding. Therefore, it is useful as a rubber composition for a vibration-isolating rubber or a seismic isolation isolator requiring a low shear modulus.
【0022】[0022]
フロントページの続き (72)発明者 西川 一郎 神奈川県川崎市川崎区小田栄2丁目1番1 号 昭和電線電纜株式会社内 (72)発明者 高山 桂一 神奈川県川崎市川崎区小田栄2丁目1番1 号 昭和電線電纜株式会社内Continuing on the front page (72) Inventor Ichiro Nishikawa 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (72) Keiichi Takayama 2-1-1, Oda Ei, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1 Inside Showa Electric Wire & Cable Co., Ltd.
Claims (3)
和炭化水素樹脂を 1〜30重量部配合してなることを特徴
とするゴム組成物。1. A rubber composition comprising 1 to 30 parts by weight of an aliphatic cyclic saturated hydrocarbon resin per 100 parts by weight of rubber.
℃のものであることを特徴とするゴム組成物。2. The rubber composition according to claim 1, wherein the aliphatic cyclic saturated hydrocarbon resin has a softening point of 25 to 160.
C. A rubber composition characterized by having
いて、 ゴムの主成分が天然ゴムであることを特徴とするゴム組
成物。3. The rubber composition according to claim 1, wherein a main component of the rubber is natural rubber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15796596A JP3325775B2 (en) | 1996-06-19 | 1996-06-19 | Rubber composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15796596A JP3325775B2 (en) | 1996-06-19 | 1996-06-19 | Rubber composition |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH101566A true JPH101566A (en) | 1998-01-06 |
JP3325775B2 JP3325775B2 (en) | 2002-09-17 |
Family
ID=15661322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15796596A Expired - Lifetime JP3325775B2 (en) | 1996-06-19 | 1996-06-19 | Rubber composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3325775B2 (en) |
-
1996
- 1996-06-19 JP JP15796596A patent/JP3325775B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP3325775B2 (en) | 2002-09-17 |
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