WO2023276994A1 - Composition de caoutchouc pour parois latérales de corps de palier en caoutchouc, et corps de palier en caoutchouc l'utilisant - Google Patents

Composition de caoutchouc pour parois latérales de corps de palier en caoutchouc, et corps de palier en caoutchouc l'utilisant Download PDF

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WO2023276994A1
WO2023276994A1 PCT/JP2022/025684 JP2022025684W WO2023276994A1 WO 2023276994 A1 WO2023276994 A1 WO 2023276994A1 JP 2022025684 W JP2022025684 W JP 2022025684W WO 2023276994 A1 WO2023276994 A1 WO 2023276994A1
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rubber
mass
bearing body
diene
rubber composition
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PCT/JP2022/025684
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English (en)
Japanese (ja)
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圭市 村谷
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住友理工株式会社
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Priority to CN202280007974.5A priority Critical patent/CN116648483A/zh
Priority to JP2022567745A priority patent/JP7217396B1/ja
Publication of WO2023276994A1 publication Critical patent/WO2023276994A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/04—Bearings; Hinges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • the present invention relates to a rubber composition for rubber bearing side walls and a rubber bearing using the same, for forming side walls of rubber bearings having anti-vibration properties and seismic isolation properties.
  • the polymer component is an ethylene-propylene-diene terpolymer (hereinafter abbreviated as "EPDM”), which has excellent weather resistance. ) is recommended.
  • EPDM ethylene-propylene-diene terpolymer
  • JP 2009-001603 A Japanese Patent No. 5712735 Japanese Patent No. 5735886
  • EPDM is used as the polymer component of the covering rubber
  • the adhesion of the covering rubber to the rubber bearing (main body) deteriorates, and the covering rubber tends to crystallize at low temperatures and become hard, functioning well in cold regions. It becomes easy to cause problems such as the loss of resistance (becoming inferior in low-temperature resistance) and the durability (tensile strength) being inferior when the coating rubber is greatly deformed. Therefore, it is required to solve the above problems while maintaining the weather resistance of EPDM.
  • the present invention has been made in view of such circumstances, and a rubber bearing that exhibits high adhesion to a rubber bearing and exhibits excellent performance in terms of low-temperature resistance, durability, and weather resistance.
  • a side wall rubber composition and a rubber bearing using the same are provided.
  • the polymer component of the side wall forming material of the rubber bearing body is a diene containing natural rubber or isoprene rubber as a main component.
  • the use of a combination of system rubber and liquid rubber was investigated. Then, by using an EPDM whose diene content and ethylene content show specific ranges as the EPDM and a liquid rubber whose molecular weight shows a specific range as the liquid rubber, a rubber bearing (main body) It has been found that it can exhibit high adhesion to , and can exhibit excellent performance in low temperature resistance, durability, and weather resistance.
  • the rubber composition for the side wall of a rubber bearing which has the above-described structure, exhibits high adhesiveness to the rubber bearing and exhibits excellent performance in terms of low-temperature resistance, durability, and weather resistance. And the reason why it is possible to provide a rubber bearing using it is considered as follows. That is, in the present invention, the diene content of EPDM is adjusted within a specific range so that it is larger than usual, and furthermore, together with the EPDM, a diene rubber containing natural rubber or isoprene rubber as a main component is used in combination, thereby improving adhesion. It is considered that the increase in the amount of diene, which is the starting point of the reaction, has made it possible to improve the adhesiveness.
  • the ethylene content of the EPDM is adjusted within a specific range so as to be lower than usual, thereby lowering the crystallinity and improving the low-temperature property.
  • the ethylene content of EPDM is lowered, the durability is normally lowered. Therefore, it is considered that the decrease in durability due to the decrease in ethylene content as described above was suppressed.
  • the liquid rubber has a good affinity with EPDM, functions as a softening agent, and has a higher molecular weight than a generally used softening agent (process oil), thus contributing to durability as described above. It is considered to be a thing.
  • a rubber composition for a side wall of a rubber bearing containing the following (A) to (C) as polymer components.
  • (A) A diene-based rubber containing at least one of natural rubber and isoprene rubber as a main component (excluding EPDM and liquid rubber).
  • (B) EPDM having a diene content of 10% by mass or more and an ethylene content of 55% by mass or less.
  • (C) Liquid rubber having a molecular weight of 1,000 to 60,000.
  • the rubber bearing sidewall according to [1], wherein (A) and (B) have a mass ratio of (A)/(B) 50/50 to 90/10. rubber composition.
  • the rubber composition for the side wall of a rubber bearing according to the present invention is used as a material for a side member formed so as to surround the outer surface of the rubber bearing, thereby achieving high adhesion to the rubber bearing. In addition to exhibiting excellent performance in low temperature resistance, durability, and weather resistance.
  • FIG. 3 is a cross-sectional view showing an example of a seismic isolation bearing
  • the rubber composition for the side wall of a rubber bearing body of the present invention (hereinafter abbreviated as "the present rubber composition") comprises the following (A) to (C) as polymer components.
  • the rubber composition desirably contains only the following (A) to (C) as polymer components, but if necessary, may contain a small amount of other polymer components.
  • a diene-based rubber containing at least one of natural rubber and isoprene rubber as a main component excluding EPDM and liquid rubber.
  • EPDM having a diene content of 10% by mass or more and an ethylene content of 55% by mass or less.
  • C Liquid rubber having a molecular weight of 1,000 to 60,000.
  • X and/or Y (X and Y are arbitrary configurations) means at least one of X and Y, and only X, only Y, or X and Y. It means three ways.
  • the diene rubber (A) a diene rubber containing at least one of natural rubber (NR) and isoprene rubber (IR) (NR and/or IR) as a main component is used.
  • the "main component” usually means 55% by mass or more of the diene rubber (A), preferably 60% by mass or more of the diene rubber (A), more preferably means that it accounts for 70% by mass or more of the diene rubber (A), more preferably 100% by mass of the diene rubber (A).
  • butadiene rubber (BR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), Butyl rubber (IIR) and the like may be used alone or in combination of two or more.
  • the diene rubber (A) does not include EPDM (ethylene-propylene-diene terpolymer) and liquid rubber.
  • EPDM ethylene-propylene-diene terpolymer
  • liquid rubber means rubber exhibiting a viscosity of 1500 Pa ⁇ s or less at room temperature (23°C). The viscosity can be measured using, for example, a Brookfield viscometer.
  • Specific EPDM (B) an EPDM having a diene content of 10% by mass or more is used from the viewpoint of obtaining desired adhesion and the like. From the same point of view, the diene content is preferably 12% by mass or more, more preferably 14% by mass or more. If the diene content is too low, the desired adhesiveness cannot be obtained, leading to peeling. The upper limit of the diene content is usually 20% by mass, preferably 18% by mass, more preferably 16% by mass. As the specific EPDM (B), an EPDM having an ethylene content of 55% by mass or less is used from the viewpoint of obtaining desired low-temperature properties.
  • the ethylene content is preferably less than 48% by mass, more preferably less than 45% by mass, and particularly preferably less than 43% by mass. If the ethylene content is too high, desired low-temperature properties cannot be obtained. Moreover, the lower limit of the ethylene content is usually 30% by mass, preferably 35% by mass, and more preferably 40% by mass.
  • a diene-based monomer having 5 to 20 carbon atoms is preferable as the diene-based monomer used as the third component constituting the specific EPDM (B).
  • the specific liquid rubber (C) a liquid rubber having a molecular weight of 1,000 to 60,000 is used from the viewpoint of obtaining desired durability. From the same point of view, the molecular weight of the liquid rubber is preferably 10,000 to 55,000, more preferably 25,000 to 50,000.
  • the weight-average molecular weight (Mw) is indicated when the value is high (the same applies to those used in the examples below).
  • the weight-average molecular weight (Mw) is the weight-average molecular weight in terms of standard polystyrene molecular weight.
  • the specific liquid rubber (C) is a rubber having the above molecular weight and a viscosity of 1500 Pa ⁇ s or less at room temperature (23°C).
  • the (C) is in a ratio of 5 to 30 parts by mass with respect to the total amount of 100 parts by mass of the (A) and (B). is preferable from the viewpoint of obtaining From the same point of view, in the present rubber composition, the ratio of (C) is preferably 10 to 25 parts by mass, preferably 15 to 20 parts by mass, with respect to 100 parts by mass of the total amount of (A) and (B). Parts by mass are more preferred.
  • the rubber composition generally contains fillers such as carbon black and silica, together with a diene rubber (A) containing NR and/or IR as a main component, a specific EPDM (B), and a specific liquid rubber (C). , a cross-linking agent is blended.
  • a cross-linking agent is blended.
  • vulcanization accelerators, vulcanization auxiliaries, anti-aging agents, softening agents and the like are also blended into the present rubber composition, if necessary.
  • the specific liquid rubber (C) functions as a softening agent, it is preferable that the rubber composition does not contain a softening agent.
  • Carbon black As the carbon black, various grades of carbon black such as SAF grade, ISAF grade, HAF grade, MAF grade, FEF grade, GPF grade, SRF grade, FT grade and MT grade are used. These are used alone or in combination of two or more. Among them, SAF grade carbon black is preferably used from the viewpoint of mechanical strength, elongation at break, and the like.
  • the content of the carbon black is 20 to 60 parts by mass with respect to the total amount of 100 parts by mass of (A) and (B). It is preferable from the viewpoint of elongation and the like. From the same point of view, in the present rubber composition, the ratio of the carbon black is preferably 30 to 50 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B). More preferably, the ratio is 35 to 45 parts by mass. If the content of the carbon black is too small, the desired reinforcing properties tend not to be obtained. A trend becomes apparent.
  • cross-linking agent examples include sulfur vulcanizing agents such as sulfur and sulfur chloride, 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, 1,1-di-t-butylperoxy-3,3,5-trimethyl Cyclohexane, 2,5-dimethyl-2,5-dibenzoylperoxyhexane, n-butyl-4,4'-di-t-butylperoxyvalerate, dicumyl peroxide, t-butylperoxybenzoate, di-t- Butylperoxy-diisopropylbenzene, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di-t-butylperoxyhexane, di-t-butylperoxide, 2,5-dimethyl-2,5-di -Peroxide vulcanizing agents such as t-butylperoxyhexy
  • the content of the cross-linking agent is preferably 0.5 to 3.0 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B). It is preferable from the viewpoint of obtaining the durability of. From the same point of view, in the present rubber composition, the ratio of the cross-linking agent is 0.75 to 2.5 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B). is preferred, and the ratio is more preferably 1.0 to 2.0 parts by mass. If the content of the cross-linking agent is too low, the tensile strength tends to decrease. Conversely, if the content of the cross-linking agent is too high, scorch resistance tends to deteriorate and elongation tends to decrease. become visible.
  • vulcanization accelerator examples include thiazole-based, sulfenamide-based, thiuram-based, aldehyde-ammonia-based, aldehyde-amine-based, guanidine-based, and thiourea-based vulcanization accelerators. These are used alone or in combination of two or more. Among these, sulfenamide-based vulcanization accelerators are preferable because of their excellent cross-linking reactivity.
  • the content of the vulcanization accelerator is 0.5 to 2.5 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B). It is preferably in the range of 1.0 to 2.0 parts by mass.
  • thiazole-based vulcanization accelerator examples include dibenzothiazyl disulfide (MBTS), 2-mercaptobenzothiazole (MBT), 2-mercaptobenzothiazole sodium salt (NaMBT), and 2-mercaptobenzothiazole zinc salt (ZnMBT). etc. These are used alone or in combination of two or more.
  • MBTS dibenzothiazyl disulfide
  • MBT 2-mercaptobenzothiazole
  • NaMBT 2-mercaptobenzothiazole sodium salt
  • ZnMBT 2-mercaptobenzothiazole zinc salt
  • sulfenamide vulcanization accelerator examples include N-oxydiethylene-2-benzothiazolylsulfenamide (NOBS), N-cyclohexyl-2-benzothiazolylsulfenamide (CBS), Nt -butyl-2-benzothiazolylsulfenamide (BBS), N,N'-dicyclohexyl-2-benzothiazolylsulfenamide and the like. These are used alone or in combination of two or more.
  • thiuram-based vulcanization accelerator examples include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), tetrabutylthiuram disulfide (TBTD), tetrakis(2-ethylhexyl)thiuram disulfide (TOT), and tetrabenzylthiuram. disulfide (TBzTD) and the like. These are used alone or in combination of two or more.
  • TMTD tetramethylthiuram disulfide
  • TETD tetraethylthiuram disulfide
  • TBTD tetrabutylthiuram disulfide
  • TOT tetrakis(2-ethylhexyl)thiuram disulfide
  • TBzTD tetrabenzylthiuram. disulfide
  • vulcanizing aid examples include stearic acid, magnesium oxide, zinc oxide and the like. These are used alone or in combination of two or more.
  • the content of the vulcanization aid is preferably in a ratio of 0.1 to 10 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B). More preferably, it ranges from 0.3 to 7 parts by mass.
  • Anti-aging agent examples include carbamate-based anti-aging agents, phenylenediamine-based anti-aging agents, phenol-based anti-aging agents, diphenylamine-based anti-aging agents, quinoline-based anti-aging agents, imidazole-based anti-aging agents, and waxes. can give. These are used alone or in combination of two or more.
  • the content of the anti-aging agent is preferably 0.5 to 15 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B), and more It is preferably in the range of 1 to 10 parts by mass.
  • Softener examples include naphthenic oil, paraffinic oil, and aromatic oil. These are used alone or in combination of two or more.
  • the content of the softening agent is preferably 0 to 20 parts by mass, more preferably 0 parts by mass, with respect to 100 parts by mass of the total amount of (A) and (B). It is in the range of to 10 parts by mass.
  • the specific liquid rubber (C) functions as a softening agent, the desired performance can be exhibited even if the softening agent is not included. be able to.
  • the present rubber composition can be prepared by blending the above components and kneading them using a kneader such as a kneader, a Banbury mixer, or a roll.
  • a kneader such as a kneader, a Banbury mixer, or a roll.
  • This rubber composition is a rubber composition exclusively used for forming the side walls of rubber bearings having anti-vibration properties and seismic isolation properties.
  • the rubber composition is preferably used as a material for side walls of large bearings such as bridge bearings and building bearings.
  • a seismic isolation bearing for a bridge or building is, for example, as shown in FIG.
  • Side members 5 made of covering rubber are provided.
  • the side member 5 is made of a crosslinked body of the present rubber composition.
  • the illustrated upper mounting plate 3 and lower mounting plate 4 are metal mounting plates, and are adhesively fixed to the upper and lower portions of the laminate of the hard plate 1 and the rubber layer 2 .
  • the lower mounting plate 4 is fixed to a lower structure such as a bridge pier
  • the upper mounting plate 3 is fixed to an upper structure such as a bridge girder.
  • the hard plate for example, a metal plate such as a rolled steel plate or an iron plate, a hard plastic plate material, or the like is used.
  • the rubber composition which is the material of the rubber layer 2, contains diene rubber such as NR and IR as a polymer component and a vulcanizing agent.
  • diene rubber such as NR and IR
  • the rubber composition can be prepared by kneading the mixture of the above materials using a kneader such as a kneader, a Banbury mixer, an open roll, or a twin-screw stirrer.
  • the present rubber bearing (see FIG. 1) is produced, for example, as follows. That is, first, a rubber composition as a material for the rubber layer 2 is prepared as described above. Next, a plurality of hard plates 1 of a predetermined size are prepared, and an upper mounting plate 3 and a lower mounting plate 4 are also prepared. Then, on the lower mounting plate 4, an unvulcanized rubber sheet obtained by molding the rubber composition, which is the material for the rubber layer 2, into a sheet shape and punching out to a predetermined size, and the hard plate 1 are alternately stacked. , the upper mounting plate 3 is stacked to produce a laminate (rubber bearing). An adhesive may be applied in advance to the lamination surfaces of the hard plate 1 and the like.
  • the present rubber composition prepared as described above is molded into a sheet to produce an unvulcanized rubber sheet.
  • the unvulcanized rubber sheet is semi-crosslinked to the extent that it is not completely crosslinked (to the extent that vulcanization adhesion is obtained). It is semi-crosslinked by heating at 10° C. for 1 to 30 minutes.
  • this is set in a predetermined mold, and the unvulcanized rubber sheet is placed in a By heating at 180° C. for 1 to 24 hours for cross-linking and vulcanization bonding to the rubber bearing, a rubber bearing (the present rubber bearing) having side members 5 made of the present rubber composition can be produced. can.
  • the laminate (rubber bearing) is formed by setting the hard plate 1, the upper mounting plate 3, and the lower mounting plate 4 in a mold so as to have a predetermined arrangement, and filling the gap in the mold. It can also be produced by injecting a rubber composition, which is the material for the rubber layer 2, by injection molding or the like, heating and vulcanizing it, and then removing it from the mold.
  • the present rubber bearing can also be produced as follows. That is, using a rubber composition which is a material for the rubber layer 2, a rubber sheet (rubber layer 2) having a predetermined thickness is formed by extrusion molding or the like, and then this is bonded to a predetermined hard plate 1 using an appropriate adhesive. are alternately laminated and adhered to produce a rubber block, and if necessary, the upper mounting plate 3 and the lower mounting plate 4 are adhered to the upper and lower surfaces of the rubber block to integrate them.
  • the present rubber bearing can be manufactured by forming the side member 5 on the outer surface of the rubber bearing thus obtained by the method described above.
  • the side member 5 is formed by injection molding the rubber composition between the outer peripheral surface of the rubber bearing and the inner peripheral surface of the mold. It can also be formed by injecting and cross-linking the rubber composition.
  • the heating conditions for the cross-linking conform to the above production method. However, the step of semi-crosslinking as in the above manufacturing method is not necessary, and the crosslinkage may be performed by heating as it is.
  • the dimensions of the rubber bearing thus obtained are, for example, an outer diameter of about 20 to 200 cm and a total thickness of about 10 to 80 cm. Further, the thickness of each layer constituting the present rubber bearing body may be within a range in which the intended function of each layer can be sufficiently achieved.
  • the thickness of the rubber layer 2 is about 0.5 to 7 cm per layer, and the thickness of the side member 5 is about 0.5 to 10 cm.
  • the number of laminated hard plates 1 and rubber layers 2 in the present rubber bearing can also be appropriately set according to the application of the seismic isolation laminated body.
  • the outer shape of the present rubber bearing can be appropriately set according to its application, such as a cylindrical shape, an elliptical columnar shape, a prismatic shape, or the like.
  • EPDM (ii) JSR Corporation, product name: EP331 (ethylene content: 47% by mass, diene content: 11.3% by mass)
  • Examples 1 to 10, Comparative Examples 1 to 5 Each of the above polymer components and a softening agent are blended in the ratios shown in Tables 1 and 2 below, and further, stearic acid (manufactured by NOF Corporation, product name: beads stearic acid Sakura) 2 parts by mass and zinc oxide (Sakai Chemical Kogyosha, product name: two types of zinc oxide) 5 parts by mass, amine anti-aging agent (Seiko Chemical Co., product name: Ozonon 6C) 3 parts by mass, wax (Ouchi Shinko Kagaku Co., product name : Sannok) 4 parts by mass, 35 parts by mass of SAF grade carbon black (manufactured by Tokai Carbon Co., Ltd., product name: Seast 9M), and a sulfenamide-based vulcanization accelerator (manufactured by Ouchi Shinko Kagaku Co., Ltd., product name: Noccellar CZ -G) 1 part by mass and 1
  • the components excluding the vulcanizing agent and the vulcanization accelerator were kneaded in a Banbury mixer for 5 minutes, discharged when the temperature reached 150°C, and after obtaining a masterbatch, vulcanization was performed on the masterbatch.
  • the rubber composition was prepared by blending the agent and the vulcanization accelerator in the proportions shown in the table and kneading them with an open roll.
  • Keq (-30° C.) and Keq (20° C.) at each measurement temperature were obtained from the obtained load/deflection curves for a total of 10 times from the second time to the eleventh time.
  • G (temperature dependence) was calculated from the following formula. Then, " ⁇ (very good)” for G less than 1.5, “ ⁇ (good)” for G 1.5 or more and less than 1.6, and "X” for G of 1.6 or more (poor)”.
  • G (temperature dependence) Keq (-30°C)/Keq (20°C)
  • the rubber compositions of Examples exhibit high adhesion due to cross-linking, and exhibit excellent performance in low-temperature resistance, tensile strength (durability), and ozone resistance (weather resistance). Therefore, it can be seen that the rubber composition is excellent as a rubber composition for the side wall of a rubber bearing body. Therefore, it is judged that the rubber compositions of the examples are excellent as materials for side members of seismic isolation bearings for use in bridges and buildings, as shown in FIG.
  • the rubber composition of Comparative Example 1 was inferior in ozone resistance (weather resistance) to that of Examples because the polymer component was natural rubber alone.
  • the rubber composition of Comparative Example 2 had a lower diene content in the EPDM, and thus the adhesiveness was inferior to that of the Examples. Since the rubber composition of Comparative Example 3 contained a large amount of ethylene in the EPDM, the low temperature resistance was inferior to that of Examples.
  • the rubber composition of Comparative Example 4 used a softening agent having a molecular weight lower than that of liquid rubber (molecular weight of less than 1000), resulting in a tensile strength inferior to that of Examples.
  • the rubber composition of Comparative Example 5 contained no liquid rubber and contained a large proportion of EPDM, resulting in inferior tensile strength, low-temperature resistance, and adhesiveness to those of Examples.
  • the rubber composition for rubber bearing sidewalls of the present invention is a rubber composition exclusively used for forming sidewalls of rubber bearings having anti-vibration properties and seismic isolation properties.
  • the rubber composition is preferably used as a material for side walls of large bearings such as bridge bearings and building bearings. It can also be used as a vibration damper for products.

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Abstract

La présente invention concerne : une composition de caoutchouc pour des parois latérales de corps de palier en caoutchouc, la composition de caoutchouc présentant une adhérence élevée à un corps de palier en caoutchouc, tout en présentant d'excellentes performances en ce qui concerne les propriétés à basse température, la durabilité et la résistance aux intempéries ; et un corps de palier en caoutchouc qui utilise cette composition de caoutchouc pour des parois latérales de corps de palier en caoutchouc.　Ce qui précède est obtenu au moyen d'un corps de palier en caoutchouc qui est obtenu par l'empilement alterné de couches de caoutchouc 2 et de plaques dures 1 et l'agencement d'un matériau de surface latérale 5, qui est formé d'un caoutchouc de recouvrement, afin d'entourer la surface latérale externe du corps de palier en caoutchouc, le matériau de surface latérale 5 étant formé d'un produit réticulé d'une composition de caoutchouc pour parois latérales de corps de palier en caoutchouc, la composition de caoutchouc contenant les composants polymères (A) à (C) décrits ci-dessous. (A) un caoutchouc diènique principalement composé d'un caoutchouc naturel et/ou d'un caoutchouc d'isoprène, à condition que ce caoutchouc diènique exclut un copolymère ternaire d'éthylène-propylène-diène et un caoutchouc liquide. (B) un copolymère ternaire d'éthylène-propylène-diène présentant une teneur en diène de 10 % en masse ou plus et une teneur en éthylène de 55 % en masse ou moins. (C) un caoutchouc liquide présentant un poids moléculaire de 1000 à 60000.
PCT/JP2022/025684 2021-06-30 2022-06-28 Composition de caoutchouc pour parois latérales de corps de palier en caoutchouc, et corps de palier en caoutchouc l'utilisant WO2023276994A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009001603A (ja) * 2007-06-19 2009-01-08 Bridgestone Corp ゴム支承被覆用ゴムシート及びゴム支承用被覆材
JP2012211277A (ja) * 2011-03-31 2012-11-01 Yokohama Rubber Co Ltd:The ゴム支承側壁用ゴム組成物およびゴム支承体
JP2013035943A (ja) * 2011-08-08 2013-02-21 Bridgestone Corp ゴム支承被覆用ゴム組成物及びそれを用いたゴム支承被覆用ゴム
JP2017137414A (ja) * 2016-02-03 2017-08-10 中日本高速技術マーケティング株式会社 被覆ゴム組成物

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009001603A (ja) * 2007-06-19 2009-01-08 Bridgestone Corp ゴム支承被覆用ゴムシート及びゴム支承用被覆材
JP2012211277A (ja) * 2011-03-31 2012-11-01 Yokohama Rubber Co Ltd:The ゴム支承側壁用ゴム組成物およびゴム支承体
JP2013035943A (ja) * 2011-08-08 2013-02-21 Bridgestone Corp ゴム支承被覆用ゴム組成物及びそれを用いたゴム支承被覆用ゴム
JP2017137414A (ja) * 2016-02-03 2017-08-10 中日本高速技術マーケティング株式会社 被覆ゴム組成物

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