JP7488640B2 - Rubber composition for seismic isolation structure and seismic isolation structure - Google Patents
Rubber composition for seismic isolation structure and seismic isolation structure Download PDFInfo
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- 229920001971 elastomer Polymers 0.000 title claims description 76
- 239000005060 rubber Substances 0.000 title claims description 76
- 238000002955 isolation Methods 0.000 title claims description 33
- 239000000203 mixture Substances 0.000 title claims description 28
- 229920005989 resin Polymers 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 17
- 239000011593 sulfur Substances 0.000 claims description 16
- 229910052717 sulfur Inorganic materials 0.000 claims description 16
- 244000043261 Hevea brasiliensis Species 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 229920003052 natural elastomer Polymers 0.000 claims description 6
- 229920001194 natural rubber Polymers 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical group C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-UHFFFAOYSA-N 0.000 claims description 5
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 description 20
- 239000003795 chemical substances by application Substances 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 230000003712 anti-aging effect Effects 0.000 description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 239000006229 carbon black Substances 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 4
- 239000008117 stearic acid Substances 0.000 description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 4
- 239000004636 vulcanized rubber Substances 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 229920003244 diene elastomer Polymers 0.000 description 3
- 229920003049 isoprene rubber Polymers 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 2
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 2
- 239000012990 dithiocarbamate Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- 239000006237 Intermediate SAF Substances 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000004982 aromatic amines Chemical class 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- -1 diphenyl disulfide compound Chemical class 0.000 description 1
- GUUVPOWQJOLRAS-UHFFFAOYSA-N diphenyl disulphide Natural products C=1C=CC=CC=1SSC1=CC=CC=C1 GUUVPOWQJOLRAS-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000013040 rubber vulcanization Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- QAZLUNIWYYOJPC-UHFFFAOYSA-M sulfenamide Chemical compound [Cl-].COC1=C(C)C=[N+]2C3=NC4=CC=C(OC)C=C4N3SCC2=C1C QAZLUNIWYYOJPC-UHFFFAOYSA-M 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
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Description
本発明は、免震構造体用ゴム組成物および免震構造体に関する。 The present invention relates to a rubber composition for a seismic isolation structure and a seismic isolation structure.
建築物の基礎免震、橋梁や高架道路などの構造物の支承には、加硫ゴムからなるゴム層と鋼板からなる硬質層とを交互に積層した免震構造体が用いられている。この免震構造体は、上下方向には高い剛性、せん断方向には低い剛性を有する弾性構造体であり、地震の振動数に対して建築物の固有振動数を低減することにより、振動の入力加速度を減少し、建築物あるいはその中の人、設備などに対する被害を最小限にするものである。 Seismic isolation structures made of alternating layers of rubber made of vulcanized rubber and hard layers made of steel plates are used to isolate the bases of buildings and to support structures such as bridges and elevated roads. These seismic isolation structures are elastic structures with high rigidity in the vertical direction and low rigidity in the shear direction, and by reducing the natural frequency of the building relative to the frequency of an earthquake, they reduce the input acceleration of vibration and minimize damage to the building and the people and equipment within it.
ただし、免震構造体には、過度の大変形が付与されることもあり、その場合にゴム層と硬質層との剥離などの故障を避けるため、ゴム層内の強度均一化や接着性向上が要求される。 However, seismic isolation structures are sometimes subjected to excessively large deformations, and in such cases, uniform strength and improved adhesion within the rubber layer are required to avoid failures such as peeling between the rubber layer and the hard layer.
下記特許文献１には、せん断破壊特性の向上を目的として、天然ゴムとジフェニルジスルフィド化合物とを含む加硫ゴムからなる軟質層を備える免震支承構造体が記載されている。 The following Patent Document 1 describes a seismic isolation bearing structure that includes a soft layer made of vulcanized rubber containing natural rubber and a diphenyl disulfide compound, with the aim of improving shear fracture properties.
しかしながら、上記特許文献１に記載の技術では、免震構造体が備えるゴム層の強度均一化や接着性向上に関し、さらなる改良の余地があることが判明した。 However, it was found that the technology described in Patent Document 1 above still has room for improvement in terms of making the rubber layer in the seismic isolation structure more uniform in strength and improving adhesion.
本発明は上記実情に鑑みてなされたものであり、その目的は、免震構造体が備えるゴム層の接着性を向上し得る免震構造体用ゴム組成物および免震構造体を提供することにある。 The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to provide a rubber composition for a seismic isolation structure and a seismic isolation structure that can improve the adhesion of the rubber layer of the seismic isolation structure.
本発明は、ゴム成分１００質量部に対し、不溶性硫黄を０．５～３質量部、および樹脂成分を４質量部以下含有する免震構造体用ゴム組成物に関する。かかる構成によれば、接着界面だけでなく、加硫後のゴム層の内部でも架橋密度が均一化されているため、接着界面およびゴム内部のいずれにおいてもゴム破断が防止される。このため、本発明に係る免震構造体用ゴム組成物を加硫してゴム層を製造した場合、硬質層との接着性に優れ、その結果、耐久性に優れた免震構造体を製造することができる。 The present invention relates to a rubber composition for seismic isolation structures that contains 0.5 to 3 parts by mass of insoluble sulfur and 4 parts by mass or less of a resin component per 100 parts by mass of a rubber component. With this configuration, the crosslink density is uniform not only at the adhesive interface but also inside the rubber layer after vulcanization, preventing rubber breakage both at the adhesive interface and inside the rubber. Therefore, when a rubber layer is manufactured by vulcanizing the rubber composition for seismic isolation structures according to the present invention, it is possible to manufacture a seismic isolation structure that has excellent adhesion to the hard layer and, as a result, excellent durability.
上記免震構造体用ゴム組成物において、前記樹脂成分が、芳香族系炭化水素樹脂であることが好ましく、前記樹脂成分が、クマロン・インデン樹脂であることがより好ましい。これらの免震構造体用ゴム組成物を加硫してゴム層を製造した場合、さらに鋼板との接着性に優れ、その結果、耐久性に優れた免震構造体を製造することができる。 In the rubber composition for seismic isolation structures, the resin component is preferably an aromatic hydrocarbon resin, and more preferably a coumarone-indene resin. When these rubber compositions for seismic isolation structures are vulcanized to produce a rubber layer, the rubber layer has even better adhesion to the steel plate, and as a result, a seismic isolation structure with excellent durability can be produced.
本発明に係る免震構造体は、前記いずれかに記載の免震構造体用ゴム組成物を加硫成形してなるゴム層と、鋼板からなる硬質層とを交互に積層した免震構造体であり、ゴム層と硬質層との接着性に優れるため、耐久性に優れる。 The base isolation structure according to the present invention is a base isolation structure in which rubber layers formed by vulcanization molding of any of the rubber compositions for base isolation structures described above and hard layers made of steel plates are alternately laminated, and the adhesion between the rubber layers and the hard layers is excellent, resulting in excellent durability.
本発明に係る免震構造体用ゴム組成物は、ゴム成分、不溶性硫黄、および樹脂成分を含有する。 The rubber composition for a seismic isolation structure according to the present invention contains a rubber component, insoluble sulfur, and a resin component.
本発明に係る免震構造体用ゴム組成物は、ゴム成分として、例えばジエン系ゴムを含有することが好ましい。ジエン系ゴムとしては、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、スチレンブタジエンゴム（ＳＢＲ）、ブチルゴム（ＩＩＲ）、およびアクリロニトリルブタジエンゴム（ＮＢＲ）などが挙げられる。上記ジエン系ゴムの中でも、天然ゴムおよびイソプレンゴムの少なくとも１種を使用することが好ましい。 The rubber composition for seismic isolation structures according to the present invention preferably contains, for example, a diene rubber as a rubber component. Examples of diene rubber include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), butyl rubber (IIR), and acrylonitrile butadiene rubber (NBR). Of the diene rubbers, it is preferable to use at least one of natural rubber and isoprene rubber.
本発明に係る免震構造体用ゴム組成物は、ゴム成分１００質量部に対し、不溶性硫黄を０．５～３質量部含有する。特に、ゴム成分１００質量部に対し、不溶性硫黄を０．５～１．５質量部含有することが好ましい。不溶性硫黄は、ＪＩＳ Ｋ６２２２－１：２００４ 付属書Ａ 表３，４に１０グレードが規定されており、本発明においては任意のグレードのものを使用可能である。 The rubber composition for seismic isolation structures according to the present invention contains 0.5 to 3 parts by mass of insoluble sulfur per 100 parts by mass of the rubber component. In particular, it is preferable that the rubber composition contains 0.5 to 1.5 parts by mass of insoluble sulfur per 100 parts by mass of the rubber component. There are 10 grades of insoluble sulfur specified in Tables 3 and 4 of Appendix A of JIS K6222-1:2004, and any grade can be used in the present invention.
また、本発明に係る免震構造体用ゴム組成物は、ゴム成分１００質量部に対し、樹脂成分を４質量部以下含有する。特に、ゴム成分１００質量部に対し、樹脂成分を１～３質量部含有することが好ましい。 The rubber composition for base isolation structures according to the present invention contains 4 parts by mass or less of a resin component per 100 parts by mass of the rubber component. It is particularly preferable that the resin component is contained in an amount of 1 to 3 parts by mass per 100 parts by mass of the rubber component.
本発明においては、樹脂成分として、特に芳香族系炭化水素樹脂を使用することが好ましく、クマロン・インデン樹脂を使用することがより好ましい。クマロン・インデン樹脂は、クマロン、インデン、スチレンを主成分とする共重合樹脂であり、市販品としては例えば日塗レジン社製の商品名「Ｇ－９０」などが挙げられる。 In the present invention, it is particularly preferable to use aromatic hydrocarbon resins as the resin component, and it is even more preferable to use coumarone-indene resin. Coumarone-indene resin is a copolymer resin whose main components are coumarone, indene, and styrene, and a commercially available product such as "G-90" manufactured by Nippon Paint Resin Co., Ltd. is an example.
本発明に係る免震構造体用ゴム組成物は、上記ゴム成分、不溶性硫黄、および樹脂成分と共に、加硫促進剤、カーボンブラック、シリカ、シランカップリング剤、酸化亜鉛、ステアリン酸、加硫促進助剤、加硫遅延剤、老化防止剤、ワックスやオイルなどの軟化剤、加工助剤などの通常ゴム工業で使用される配合剤を、本発明の効果を損なわない範囲において適宜配合し用いることができる。 The rubber composition for base-isolated structures according to the present invention can be appropriately mixed with compounding agents normally used in the rubber industry, such as vulcanization accelerators, carbon black, silica, silane coupling agents, zinc oxide, stearic acid, vulcanization accelerator assistants, vulcanization retarders, antioxidants, softeners such as wax and oil, and processing aids, together with the above-mentioned rubber components, insoluble sulfur, and resin components, within the range that does not impair the effects of the present invention.
カーボンブラックとしては、例えばＳＡＦ、ＩＳＡＦ、ＨＡＦ、ＦＥＦ、ＧＰＦなどが用いられる。カーボンブラックは、加硫後のゴムの硬度、補強性、低発熱性などのゴム特性を調整し得る範囲で使用することができる。カーボンブラックの配合量はゴム成分１００質量部に対して、１～１００質量部であることが好ましく、５～４０質量部であることがより好ましい。 Examples of carbon black that can be used include SAF, ISAF, HAF, FEF, and GPF. Carbon black can be used in a range that allows adjustment of rubber properties such as hardness, reinforcement, and low heat generation of the rubber after vulcanization. The amount of carbon black to be mixed is preferably 1 to 100 parts by mass, and more preferably 5 to 40 parts by mass, per 100 parts by mass of the rubber component.
加硫促進剤としては、ゴム加硫用として通常用いられる、スルフェンアミド系加硫促進剤、チウラム系加硫促進剤、チアゾール系加硫促進剤、チオウレア系加硫促進剤、グアニジン系加硫促進剤、ジチオカルバミン酸塩系加硫促進剤などの加硫促進剤を単独、または適宜混合して使用しても良い。 As the vulcanization accelerator, sulfenamide-based vulcanization accelerators, thiuram-based vulcanization accelerators, thiazole-based vulcanization accelerators, thiourea-based vulcanization accelerators, guanidine-based vulcanization accelerators, dithiocarbamate-based vulcanization accelerators, and other vulcanization accelerators commonly used for rubber vulcanization may be used alone or in appropriate mixtures.
老化防止剤としては、ゴム用として通常用いられる、芳香族アミン系老化防止剤、アミン－ケトン系老化防止剤、モノフェノール系老化防止剤、ビスフェノール系老化防止剤、ポリフェノール系老化防止剤、ジチオカルバミン酸塩系老化防止剤、チオウレア系老化防止剤などの老化防止剤を単独、または適宜混合して使用しても良い。 As the antiaging agent, antiaging agents commonly used for rubber, such as aromatic amine antiaging agents, amine-ketone antiaging agents, monophenol antiaging agents, bisphenol antiaging agents, polyphenol antiaging agents, dithiocarbamate antiaging agents, and thiourea antiaging agents, may be used alone or in appropriate mixtures.
本発明に係る免震構造体用ゴム組成物は、上記ゴム成分、不溶性硫黄、および樹脂成分と共に、加硫促進剤、カーボンブラック、シリカ、シランカップリング剤、酸化亜鉛、ステアリン酸、加硫促進助剤、加硫遅延剤、老化防止剤、ワックスやオイルなどの軟化剤、加工助剤などの通常ゴム工業で使用される配合剤などを、バンバリーミキサー、ニーダー、ロールなどの通常のゴム工業において使用される混練機を用いて混練りすることにより得られる。 The rubber composition for base-isolated structures according to the present invention is obtained by kneading the above-mentioned rubber component, insoluble sulfur, and resin component together with compounding agents normally used in the rubber industry, such as vulcanization accelerators, carbon black, silica, silane coupling agents, zinc oxide, stearic acid, vulcanization accelerator assistants, vulcanization retarders, antioxidants, softeners such as wax and oil, and processing aids, using a kneading machine normally used in the rubber industry, such as a Banbury mixer, kneader, or roll.
また、上記各成分の配合方法は特に限定されず、不溶性硫黄、および加硫促進剤などの加硫系成分以外の配合成分を予め混練してマスターバッチとし、残りの成分を添加してさらに混練する方法、各成分を任意の順序で添加し混練する方法、全成分を同時に添加して混練する方法などのいずれでもよい。 The method of mixing the above components is not particularly limited, and may be any of the following: a method in which the components other than the insoluble sulfur and vulcanization-related components such as the vulcanization accelerator are premixed to form a master batch, and the remaining components are added and further kneaded; a method in which the components are added in any order and kneaded; or a method in which all the components are added simultaneously and kneaded.
本発明に係る免震構造体は、ロールやローラヘッド付押出機などを用いて、混練りすることにより得られた未加硫の免震構造体用ゴム組成物をシート状に成形し、ついで円板状に打ち抜いた後、鋼板（硬質層）と未加硫のシート状のゴム層（免震構造体用ゴム組成物）とを交互に積層し、必要に応じて加圧しつつ、所定の温度で加硫成形することにより製造することができる。 The seismic isolation structure according to the present invention can be manufactured by forming the unvulcanized rubber composition for seismic isolation structures obtained by kneading using a roll or an extruder with a roller head into a sheet, then punching it into a disk shape, and then laminating steel plates (hard layers) and unvulcanized sheet-shaped rubber layers (rubber composition for seismic isolation structures) alternately, and vulcanizing and molding at a specified temperature while applying pressure as necessary.
なお、硬質層とゴム層とを積層する前に、少なくとも片方、あるいは両方の接着面に加硫接着剤を塗工しても良い。硬質層に加硫接着剤を塗工する場合は、鋼板との接着性に優れた加硫接着剤を適宜選択すれば良く、ゴム層に加硫接着剤を塗工する場合は、ゴムとの接着性に優れた加硫接着剤を適宜選択すれば良い。また、硬質層およびゴム層の両方に加硫接着剤を塗工しても良い。 Before laminating the hard layer and the rubber layer, a vulcanizing adhesive may be applied to at least one or both of the adhesive surfaces. When applying a vulcanizing adhesive to the hard layer, a vulcanizing adhesive with excellent adhesion to the steel plate may be appropriately selected, and when applying a vulcanizing adhesive to the rubber layer, a vulcanizing adhesive with excellent adhesion to the rubber may be appropriately selected. Also, a vulcanizing adhesive may be applied to both the hard layer and the rubber layer.
本発明に係る免震構造体は、ゴム層と硬質層との間の接着性に優れるため、耐久性に優れる。 The seismic isolation structure of the present invention has excellent durability due to the excellent adhesion between the rubber layer and the hard layer.
以下に、この発明の実施例を記載してより具体的に説明する。 The following describes the invention in more detail by way of examples.
（ゴム組成物の調製）
ゴム成分１００質量部に対して、表１の配合処方に従い、実施例１～５、比較例１～３のゴム組成物を配合し、通常のバンバリーミキサーを用いて混練し、ゴム組成物を調整した。表１に記載の各配合剤を以下に示す。
(Preparation of Rubber Composition)
The rubber compositions of Examples 1 to 5 and Comparative Examples 1 to 3 were compounded with 100 parts by mass of the rubber component according to the compounding recipes in Table 1, and kneaded using a normal Banbury mixer to prepare rubber compositions. The compounding ingredients listed in Table 1 are shown below.
（ａ）ゴム成分 ＮＲ（ＲＳＳ＃３）
（ｂ）カーボンブラック（商品名「シーストＳ（ＳＲＦ）」、東海カーボン社製）
（ｃ）オイル（商品名「ＮＣ１４０」、ＪＸ日鉱日石エネルギー社製）
（ｄ）ワックス（商品名「ＯＺＯＡＣＥ２７０１」、日本精鑞社製）
（ｅ）樹脂成分（芳香族系炭化水素樹脂（クマロン・インデン樹脂））（商品名「Ｇ－９０」、日塗化学社製）
（ｆ）酸化亜鉛（商品名「酸化亜鉛２種」、三井金属鉱業社製）
（ｇ）ステアリン酸（商品名「工業用ステアリン酸」、花王社製）
（ｈ）老化防止剤（商品名「ノクラック６Ｃ」、大内振興化学社製）
（ｉ）硫黄Ａ（粉末硫黄）（商品名「５％オイル処理１５０メッシュ粉末硫黄」、鶴見化学社製）
（ｊ）硫黄Ｂ（不溶性硫黄）（商品名「２０％オイル処理サンフェルＥＸ」、三新化学工業社製）
（ｋ）加硫促進剤（商品名「サンセラーＮＳ－Ｇ」、三新化学工業社製）
(a) Rubber component NR (RSS#3)
(b) Carbon black (product name "Seast S (SRF)", manufactured by Tokai Carbon Co., Ltd.)
(c) Oil (product name "NC140", manufactured by JX Nippon Oil & Energy Corporation)
(d) Wax (product name "OZOACE 2701", manufactured by Nippon Seiro Co., Ltd.)
(e) Resin component (aromatic hydrocarbon resin (coumarone-indene resin)) (product name "G-90", manufactured by Nippon Paint Chemical Co., Ltd.)
(f) Zinc oxide (product name "Zinc oxide type 2", manufactured by Mitsui Mining & Smelting Co., Ltd.)
(g) Stearic acid (product name "Industrial Stearic Acid", manufactured by Kao Corporation)
(h) Antiaging agent (product name "Nocrac 6C", manufactured by Ouchi Shinko Chemical Co., Ltd.)
(i) Sulfur A (powdered sulfur) (product name "5% oil-treated 150 mesh powdered sulfur", manufactured by Tsurumi Chemical Industry Co., Ltd.)
(j) Sulfur B (insoluble sulfur) (product name "20% oil-treated Sanfel EX", manufactured by Sanshin Chemical Industry Co., Ltd.)
(k) Vulcanization accelerator (product name "Suncerer NS-G", manufactured by Sanshin Chemical Industry Co., Ltd.)
（接着性評価）
図１に示す「１ブロック・ラップ・シェア型」試験体（ゴム部：幅２５ｍｍ、長さ２５ｍｍ、厚み５ｍｍ）を製造し、これを１５０℃で２０分間加硫接着することにより評価サンプルを製造した。次に、島津製作所社製オートグラフを使用して、評価サンプルを２０ｍｍ／ｍｉｎの速度でせん断方向に引っ張ることで、評価サンプルの破断強度および破断伸びを評価した。評価は、いずれも比較例１を１００とした指数評価で行い、破断強度および破断伸びのいずれも指数が大きいほど、ゴム層の接着界面およびゴム内部でのゴム破断が防止され、ゴム層と硬質層との接着性に優れることを意味する。結果を表１に示す。
(Adhesion Evaluation)
A "one block lap shear type" test specimen (rubber part: width 25 mm, length 25 mm, thickness 5 mm) shown in FIG. 1 was manufactured, and this was vulcanized and bonded at 150° C. for 20 minutes to manufacture an evaluation sample. Next, using an autograph manufactured by Shimadzu Corporation, the evaluation sample was pulled in the shear direction at a speed of 20 mm/min to evaluate the breaking strength and breaking elongation of the evaluation sample. The evaluation was performed using an index evaluation with Comparative Example 1 set to 100, and the larger the index for both breaking strength and breaking elongation, the more the rubber breakage at the adhesive interface of the rubber layer and inside the rubber is prevented, and the better the adhesion between the rubber layer and the hard layer is. The results are shown in Table 1.
表１の結果から、実施例１～５に係るゴム組成物の加硫ゴムは、破断強度および破断伸びの両方に優れるため、ゴム層の接着界面およびゴム内部でのゴム破断が防止され、ゴム層と硬質層との接着性に優れることがわかる。一方、不溶性硫黄の配合量が多い比較例２、樹脂成分の配合量が多い比較例３に係るゴム組成物の加硫ゴムは、破断強度および破断伸びのいずれも実施例１～５に比して劣るため、ゴム層と硬質層との接着性に劣ることがわかる。 From the results in Table 1, it can be seen that the vulcanized rubber of the rubber composition according to Examples 1 to 5 has both excellent breaking strength and breaking elongation, preventing rubber breakage at the adhesive interface of the rubber layer and inside the rubber, and has excellent adhesion between the rubber layer and the hard layer. On the other hand, the vulcanized rubber of the rubber composition according to Comparative Example 2, which contains a large amount of insoluble sulfur, and Comparative Example 3, which contains a large amount of resin component, has inferior breaking strength and breaking elongation compared to Examples 1 to 5, and therefore has inferior adhesion between the rubber layer and the hard layer.
Claims (3)
ゴム成分として天然ゴムを１００質量部含有し、
前記不溶性硫黄が２０％オイル含有品であり、
前記樹脂成分が、芳香族系炭化水素樹脂である免震構造体用ゴム組成物。 The rubber composition contains 0.5 to 3 parts by mass of insoluble sulfur as specified in Tables 3 and 4 of Appendix A of JIS K6222-1:2004 and 4 parts by mass or less of a resin component, based on 100 parts by mass of the rubber component,
The rubber component contains 100 parts by mass of natural rubber,
The insoluble sulfur is 20% oil content,
The rubber composition for a seismic isolation structure, wherein the resin component is an aromatic hydrocarbon resin.
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| JP2012087196A (en) | 2010-10-19 | 2012-05-10 | Bridgestone Corp | Rubber composition for quake-absorbing structure |
| CN103087362A (en) | 2013-01-28 | 2013-05-08 | 云南震安减震技术有限公司 | Seismic isolation rubber bearing protective rubber composite with good anti-aging performance |
| JP2014084312A (en) | 2012-10-25 | 2014-05-12 | Sumitomo Chemical Co Ltd | Compound for improving viscoelastic properties of vulcanized rubber, and rubber composition including the compound |
| JP2015054915A (en) | 2013-09-11 | 2015-03-23 | 住友ゴム工業株式会社 | Rubber composition and pneumatic tire |
| CN104761828A (en) | 2014-07-14 | 2015-07-08 | 安徽中鼎密封件股份有限公司 | High temperature resistant and anti-aging exhaust pipe lug and preparation method thereof |
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|---|---|---|---|---|
| JP2012087196A (en) | 2010-10-19 | 2012-05-10 | Bridgestone Corp | Rubber composition for quake-absorbing structure |
| JP2014084312A (en) | 2012-10-25 | 2014-05-12 | Sumitomo Chemical Co Ltd | Compound for improving viscoelastic properties of vulcanized rubber, and rubber composition including the compound |
| CN103087362A (en) | 2013-01-28 | 2013-05-08 | 云南震安减震技术有限公司 | Seismic isolation rubber bearing protective rubber composite with good anti-aging performance |
| JP2015054915A (en) | 2013-09-11 | 2015-03-23 | 住友ゴム工業株式会社 | Rubber composition and pneumatic tire |
| CN104761828A (en) | 2014-07-14 | 2015-07-08 | 安徽中鼎密封件股份有限公司 | High temperature resistant and anti-aging exhaust pipe lug and preparation method thereof |
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