WO2023276994A1 - Rubber composition for rubber bearing body side walls, and rubber bearing body using same - Google Patents
Rubber composition for rubber bearing body side walls, and rubber bearing body using same Download PDFInfo
- Publication number
- 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
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rubber
- mass
- bearing body
- diene
- rubber composition
- Prior art date
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 218
- 239000005060 rubber Substances 0.000 title claims abstract description 218
- 239000000203 mixture Substances 0.000 title claims abstract description 76
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 150000001993 dienes Chemical class 0.000 claims abstract description 23
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000005977 Ethylene Substances 0.000 claims abstract description 18
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 15
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 14
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 14
- 229920001194 natural rubber Polymers 0.000 claims abstract description 14
- 229920003049 isoprene rubber Polymers 0.000 claims abstract description 13
- 229920000642 polymer Polymers 0.000 claims abstract description 13
- 229920002943 EPDM rubber Polymers 0.000 claims description 36
- 239000000463 material Substances 0.000 abstract description 16
- 230000001747 exhibiting effect Effects 0.000 abstract description 4
- 229920006027 ternary co-polymer Polymers 0.000 abstract 2
- 238000004073 vulcanization Methods 0.000 description 23
- 239000003795 chemical substances by application Substances 0.000 description 17
- 239000004902 Softening Agent Substances 0.000 description 12
- 230000003712 anti-aging effect Effects 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000006229 carbon black Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002955 isolation Methods 0.000 description 9
- 229920000459 Nitrile rubber Polymers 0.000 description 7
- 239000003431 cross linking reagent Substances 0.000 description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- 239000005062 Polybutadiene Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- OJOWICOBYCXEKR-APPZFPTMSA-N (1S,4R)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical compound CC=C1C[C@@H]2C[C@@H]1C=C2 OJOWICOBYCXEKR-APPZFPTMSA-N 0.000 description 4
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 4
- HECLRDQVFMWTQS-RGOKHQFPSA-N 1755-01-7 Chemical compound C1[C@H]2[C@@H]3CC=C[C@@H]3[C@@H]1C=C2 HECLRDQVFMWTQS-RGOKHQFPSA-N 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 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 4
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 4
- 229960002447 thiram Drugs 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 3
- 229920002857 polybutadiene Polymers 0.000 description 3
- 239000008117 stearic acid Substances 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- VLLYOYVKQDKAHN-UHFFFAOYSA-N buta-1,3-diene;2-methylbuta-1,3-diene Chemical compound C=CC=C.CC(=C)C=C VLLYOYVKQDKAHN-UHFFFAOYSA-N 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 2
- PGAXJQVAHDTGBB-UHFFFAOYSA-N dibutylcarbamothioylsulfanyl n,n-dibutylcarbamodithioate Chemical compound CCCCN(CCCC)C(=S)SSC(=S)N(CCCC)CCCC PGAXJQVAHDTGBB-UHFFFAOYSA-N 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- GQWNEBHACPGBIG-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)-2-[2-(1,3-benzothiazol-2-ylsulfanylamino)ethoxy]ethanamine Chemical compound C1=CC=C2SC(SNCCOCCNSC=3SC4=CC=CC=C4N=3)=NC2=C1 GQWNEBHACPGBIG-UHFFFAOYSA-N 0.000 description 2
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 239000010734 process oil Substances 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- RRKODOZNUZCUBN-CCAGOZQPSA-N (1z,3z)-cycloocta-1,3-diene Chemical compound C1CC\C=C/C=C\C1 RRKODOZNUZCUBN-CCAGOZQPSA-N 0.000 description 1
- WRXCBRHBHGNNQA-UHFFFAOYSA-N (2,4-dichlorobenzoyl) 2,4-dichlorobenzenecarboperoxoate Chemical compound ClC1=CC(Cl)=CC=C1C(=O)OOC(=O)C1=CC=C(Cl)C=C1Cl WRXCBRHBHGNNQA-UHFFFAOYSA-N 0.000 description 1
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 1
- PRBHEGAFLDMLAL-GQCTYLIASA-N (4e)-hexa-1,4-diene Chemical compound C\C=C\CC=C PRBHEGAFLDMLAL-GQCTYLIASA-N 0.000 description 1
- HYBLFDUGSBOMPI-BQYQJAHWSA-N (4e)-octa-1,4-diene Chemical compound CCC\C=C\CC=C HYBLFDUGSBOMPI-BQYQJAHWSA-N 0.000 description 1
- MACMAADVRVVHBD-VMPITWQZSA-N (e)-1-(2,4-dihydroxyphenyl)-3-(2-hydroxyphenyl)prop-2-en-1-one Chemical compound OC1=CC(O)=CC=C1C(=O)\C=C\C1=CC=CC=C1O MACMAADVRVVHBD-VMPITWQZSA-N 0.000 description 1
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 description 1
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 1
- PRBHEGAFLDMLAL-UHFFFAOYSA-N 1,5-Hexadiene Natural products CC=CCC=C PRBHEGAFLDMLAL-UHFFFAOYSA-N 0.000 description 1
- UJPKMTDFFUTLGM-UHFFFAOYSA-N 1-aminoethanol Chemical compound CC(N)O UJPKMTDFFUTLGM-UHFFFAOYSA-N 0.000 description 1
- DSAYAFZWRDYBQY-UHFFFAOYSA-N 2,5-dimethylhexa-1,5-diene Chemical compound CC(=C)CCC(C)=C DSAYAFZWRDYBQY-UHFFFAOYSA-N 0.000 description 1
- BIISIZOQPWZPPS-UHFFFAOYSA-N 2-tert-butylperoxypropan-2-ylbenzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1 BIISIZOQPWZPPS-UHFFFAOYSA-N 0.000 description 1
- 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
- TXLINXBIWJYFNR-UHFFFAOYSA-N 4-phenylpyridine-2-carbonitrile Chemical compound C1=NC(C#N)=CC(C=2C=CC=CC=2)=C1 TXLINXBIWJYFNR-UHFFFAOYSA-N 0.000 description 1
- NWPQAENAYWENSD-UHFFFAOYSA-N 5-butylidenebicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(=CCCC)CC1C=C2 NWPQAENAYWENSD-UHFFFAOYSA-N 0.000 description 1
- DMGCMUYMJFRQSK-UHFFFAOYSA-N 5-prop-1-en-2-ylbicyclo[2.2.1]hept-2-ene Chemical compound C1C2C(C(=C)C)CC1C=C2 DMGCMUYMJFRQSK-UHFFFAOYSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- -1 Inc. Substances 0.000 description 1
- 239000006237 Intermediate SAF Substances 0.000 description 1
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- VTEKOFXDMRILGB-UHFFFAOYSA-N bis(2-ethylhexyl)carbamothioylsulfanyl n,n-bis(2-ethylhexyl)carbamodithioate Chemical compound CCCCC(CC)CN(CC(CC)CCCC)C(=S)SSC(=S)N(CC(CC)CCCC)CC(CC)CCCC VTEKOFXDMRILGB-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- UVJHQYIOXKWHFD-UHFFFAOYSA-N cyclohexa-1,4-diene Chemical compound C1C=CCC=C1 UVJHQYIOXKWHFD-UHFFFAOYSA-N 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- PXJJSXABGXMUSU-UHFFFAOYSA-N disulfur dichloride Chemical compound ClSSCl PXJJSXABGXMUSU-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical compound C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 229920006168 hydrated nitrile rubber Polymers 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000010690 paraffinic oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- QYZLKGVUSQXAMU-UHFFFAOYSA-N penta-1,4-diene Chemical compound C=CCC=C QYZLKGVUSQXAMU-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VLDHWMAJBNWALQ-UHFFFAOYSA-M sodium;1,3-benzothiazol-3-ide-2-thione Chemical compound [Na+].C1=CC=C2SC([S-])=NC2=C1 VLDHWMAJBNWALQ-UHFFFAOYSA-M 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- PGNWIWKMXVDXHP-UHFFFAOYSA-L zinc;1,3-benzothiazole-2-thiolate Chemical compound [Zn+2].C1=CC=C2SC([S-])=NC2=C1.C1=CC=C2SC([S-])=NC2=C1 PGNWIWKMXVDXHP-UHFFFAOYSA-L 0.000 description 1
Images
Classifications
-
- 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
Description
そして、前記被覆ゴムには耐候性(耐オゾン性等)が要求されるため、そのポリマー成分には、耐候性に優れるエチレン-プロピレン-ジエン三元共重合体(以下、「EPDM」と略す。)の使用が推奨されている。 In addition, some rubber bearings are provided with a side member made of coated rubber so as to surround the outer surface thereof (see, for example, Patent Documents 1 to 3).
Since the coating rubber is required to have weather resistance (ozone resistance, etc.), the polymer component is an ethylene-propylene-diene terpolymer (hereinafter abbreviated as "EPDM"), which has excellent weather resistance. ) is recommended.
そのため、EPDMによる耐候性を維持しつつ、前記の問題を解決することが求められている。 However, when 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.
前記のような構成とすることにより、ゴム支承体に対して高い接着性を示すとともに、低温性、耐久性、耐候性に優れた性能を発揮することができる、ゴム支承体側壁用ゴム組成物およびそれを用いたゴム支承体を提供できる理由は、以下のように考えられる。すなわち、本発明では、EPDMのジエン含有量が通常よりも多くなるよう特定範囲内で調整し、さらに前記EPDMとともに、天然ゴムやイソプレンゴムを主成分とするジエン系ゴムを併用したことにより、接着反応の起点となるジエン量が増えたため、接着性を高めることができるようになったと考えられる。また、本発明では、EPDMのエチレン含有量が通常よりも少なくなるよう特定範囲内で調整したことにより、結晶性が低下し、前記低温性を改善することができるようになったと考えられる。なお、前記のようにEPDMのエチレン含有量を低下させると、通常であれば耐久性が低下するのだが、本発明では、特定の分子量を示す液状ゴムを併用することにより補強性が得られたことから、前記のようなエチレン含有量の低下に伴う耐久性の低下が抑えられたと考えられる。しかも、前記液状ゴムは、EPDMとの馴染みが良く、軟化剤としても機能し、一般的に使用される軟化剤(プロセスオイル)よりも分子量が高いことから、前記のように耐久性に寄与したものと考えられる。 In view of the above circumstances, the present inventors have found that the polymer component of the side wall forming material of the rubber bearing body (rubber composition for rubber bearing side wall), in addition to EPDM, 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. Further, in the present invention, it is considered that 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. As described above, when 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. Moreover, 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.
[1] 下記の(A)~(C)をポリマー成分とする、ゴム支承体側壁用ゴム組成物。
(A)天然ゴムおよびイソプレンゴムの少なくとも一方を主成分とするジエン系ゴム(但し、EPDMおよび液状ゴムを含まない)。
(B)ジエン含有量が10質量%以上、エチレン含有量が55質量%以下の、EPDM。
(C)分子量が1000~60000の液状ゴム。
[2] 前記(A)と(B)が、質量比で、(A)/(B)=50/50~90/10の割合になっている、[1]に記載のゴム支承体側壁用ゴム組成物。
[3] 前記(C)が、前記(A)と(B)の合計量100質量部に対し、5~30質量部の割合になっている、[1]または[2]に記載のゴム支承体側壁用ゴム組成物。
[4] ゴムと硬質板とが交互に積層されたゴム支承体であって、前記ゴム支承体は、その外側面を囲うように被覆ゴムからなる側面材を有し、前記被覆ゴムは、[1]~[3]のいずれかに記載のゴム支承体側壁用ゴム組成物の架橋体からなる、ゴム支承体。 That is, the present invention provides the following [1] to [4].
[1] 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.
[2] 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.
[3] The rubber bearing according to [1] or [2], wherein (C) is in a proportion of 5 to 30 parts by mass with respect to the total amount of 100 parts by mass of (A) and (B). A rubber composition for body side walls.
[4] A rubber bearing body in which rubber and hard plates are alternately laminated, wherein the rubber bearing body has a side member made of coated rubber so as to surround the outer surface thereof, and the coated rubber is composed of [ 1] A rubber bearing body comprising a crosslinked product of the rubber composition for side walls of a rubber bearing body according to any one of [3].
(A)天然ゴムおよびイソプレンゴムの少なくとも一方を主成分とするジエン系ゴム(但し、EPDMおよび液状ゴムを含まない)。
(B)ジエン含有量が10質量%以上、エチレン含有量が55質量%以下の、EPDM。
(C)分子量が1000~60000の液状ゴム。 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) 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.
なお、本明細書において「Xおよび/またはY(X,Yは任意の構成)」とは、XおよびYの少なくとも一方を意味するものであって、Xのみ、Yのみ、XおよびY、の3通りを意味するものである。 Details of each component in the present rubber composition are described below.
In this specification, "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.
前記ジエン系ゴム(A)としては、天然ゴム(NR)およびイソプレンゴム(IR)の少なくとも一方(NRおよび/またはIR)を主成分とするジエン系ゴムが用いられる。なお、本発明において、「主成分」とは、通常は、ジエン系ゴム(A)の55質量%以上を意味するものであり、好ましくはジエン系ゴム(A)の60質量%以上、より好ましくはジエン系ゴム(A)の70質量%以上、さらに好ましくはジエン系ゴム(A)の100質量%を占めることを意味する。 <<Diene rubber (A)>>
As 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. In the present invention, 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).
なお、本発明において、「液状ゴム」とは、常温(23℃)で1500Pa・s以下の粘度を示すゴムを意味する。前記粘度は、例えば、B型粘度計を用いて測定することができる。 In the present invention, the diene rubber (A) does not include EPDM (ethylene-propylene-diene terpolymer) and liquid rubber.
In the present invention, "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.
前記特定のEPDM(B)としては、所望の接着性等を得る観点から、ジエン含有量が10質量%以上のEPDMが用いられる。同様の観点から、前記ジエン含有量は、好ましくは12質量%以上、より好ましくは14質量%以上である。なお、前記ジエン含有量が少なすぎると、所望の接着性を得ることができず剥離につながるようになる。また、前記ジエン含有量の上限は、通常、20質量%であり、好ましくは18質量%、より好ましくは16質量%である。
また、前記特定のEPDM(B)としては、所望の低温性等を得る観点から、エチレン含有量が55質量%以下のEPDMが用いられる。同様の観点から、前記エチレ含有量は、好ましくは48質量%未満、より好ましくは45質量%未満、特に好ましくは43質量%未満である。なお、前記エチレン含有量が多すぎると、所望の低温性等を得ることができない。また、前記エチレン含有量の下限は、通常、30質量%であり、好ましくは35質量%、より好ましくは40質量%である。
前記特定のEPDM(B)を構成する第3成分として用いられるジエン系モノマーとしては、炭素数5~20のジエン系モノマーが好ましい。具体的には、1,4-ペンタジエン、1,4-ヘキサジエン、1,5-ヘキサジエン、2,5-ジメチル-1,5-ヘキサジエン、1,4-オクタジエン、1,4-シクロヘキサジエン、シクロオクタジエン、ジシクロペンタジエン(DCP)、5-エチリデン-2-ノルボルネン(ENB)、5-ブチリデン-2-ノルボルネン、2-メタリル-5-ノルボルネン、2-イソプロペニル-5-ノルボルネン等があげられる。これらは単独でもしくは二種以上併せて用いられる。これらジエン系モノマー(第3成分)のなかでも、ジシクロペンタジエン(DCP)、5-エチリデン-2-ノルボルネン(ENB)が好ましい。 《Specific EPDM (B)》
As the 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. From the same point of view, 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). Specifically, 1,4-pentadiene, 1,4-hexadiene, 1,5-hexadiene, 2,5-dimethyl-1,5-hexadiene, 1,4-octadiene, 1,4-cyclohexadiene, cycloocta Diene, dicyclopentadiene (DCP), 5-ethylidene-2-norbornene (ENB), 5-butylidene-2-norbornene, 2-methallyl-5-norbornene, 2-isopropenyl-5-norbornene and the like. These are used alone or in combination of two or more. Among these diene monomers (third component), dicyclopentadiene (DCP) and 5-ethylidene-2-norbornene (ENB) are preferred.
前記特定の液状ゴム(C)としては、所望の耐久性等を得る観点から、分子量が1000~60000の液状ゴムが用いられる。同様の観点から、前記液状ゴムの分子量は、10000~55000であることが好ましく、25000~50000であることがより好ましい。
なお、前記液状ゴム(C)の分子量は、その値が高いものは、重量平均分子量(Mw)の値を示したものである(後記の実施例で使用のものも同様)。ここで、前記重量平均分子量(Mw)は、標準ポリスチレン分子量換算による重量平均分子量であり、高速液体クロマトグラフ(Waters社製、「Waters 2695(本体)」と「Waters 2414(検出器)」)に、カラム:Shodex GPC KF-806L(排除限界分子量:2×107、分離範囲:100~2×107、理論段数:10000段/本、充填剤材質:スチレン-ジビニルベンゼン共重合体、充填剤粒径:10μm)の3本を直列にして用いることにより測定される。 <<Specific liquid rubber (C)>>
As 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.
As for the molecular weight of the liquid rubber (C), the weight-average molecular weight (Mw) is indicated when the value is high (the same applies to those used in the examples below). Here, the weight-average molecular weight (Mw) is the weight-average molecular weight in terms of standard polystyrene molecular weight. , Column: Shodex GPC KF-806L (exclusion limit molecular weight: 2×10 7 , separation range: 100 to 2×10 7 , number of theoretical plates: 10,000 plates/line, filler material: styrene-divinylbenzene copolymer, filler Particle size: 10 μm) is measured by using three in series.
なお、本ゴム組成物においては、前記特定の液状ゴム(C)が軟化剤としての機能を示すことから、軟化剤は不含とすることが好ましい。 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. In addition, vulcanization accelerators, vulcanization auxiliaries, anti-aging agents, softening agents and the like are also blended into the present rubber composition, if necessary.
In the present rubber composition, since the specific liquid rubber (C) functions as a softening agent, it is preferable that the rubber composition does not contain a softening agent.
前記カーボンブラックとしては、例えば、SAF級,ISAF級,HAF級,MAF級,FEF級,GPF級,SRF級,FT級,MT級等の種々のグレードのカーボンブラックが用いられる。これらは単独でもしくは二種以上併せて用いられる。なかでも、機械的強度および破断伸び等の観点から、SAF級カーボンブラックが好ましく用いられる。 "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.
前記架橋剤としては、例えば、硫黄、塩化硫黄等の硫黄系加硫剤や、2,4-ジクロロベンゾイルペルオキシド、ベンゾイルペルオキシド、1,1-ジ-t-ブチルペルオキシ-3,3,5-トリメチルシクロヘキサン、2,5-ジメチル-2,5-ジベンゾイルペルオキシヘキサン、n-ブチル-4,4'-ジ-t-ブチルペルオキシバレレート、ジクミルパーオキサイド、t-ブチルペルオキシベンゾエート、ジ-t-ブチルペルオキシ-ジイソプロピルベンゼン、t-ブチルクミルパーオキサイド、2,5-ジメチル-2,5-ジ-t-ブチルペルオキシヘキサン、ジ-t-ブチルパーオキサイド、2,5-ジメチル-2,5-ジ-t-ブチルペルオキシヘキシン-3、1,3-ビス-(t-ブチルパーオキシ-イソプロピル)ベンゼン等の過酸化物加硫剤があげられる。これらは単独でもしくは2種以上併せて用いられる。なかでも、硫黄、ジクミルパーオキサイドが好適に用いられる。 《Crosslinking agent》
Examples of the cross-linking agent 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-butylperoxyhexyne-3,1,3-bis-(t-butylperoxy-isopropyl)benzene. These are used alone or in combination of two or more. Among them, sulfur and dicumyl peroxide are preferably used.
前記加硫促進剤としては、例えば、チアゾール系,スルフェンアミド系,チウラム系,アルデヒドアンモニア系,アルデヒドアミン系,グアニジン系,チオウレア系等の加硫促進剤があげられる。これらは単独でもしくは二種以上併せて用いられる。これらのなかでも、架橋反応性に優れる点で、スルフェンアミド系加硫促進剤が好ましい。 《Vulcanization accelerator》
Examples of the vulcanization accelerator 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.
前記加硫助剤としては、例えば、ステアリン酸、酸化マグネシウム、酸化亜鉛等があげられる。これらは単独でもしくは二種以上併せて用いられる。 《Vulcanizing aid》
Examples of the vulcanizing aid include stearic acid, magnesium oxide, zinc oxide and the like. These are used alone or in combination of two or more.
前記老化防止剤としては、例えば、カルバメート系老化防止剤、フェニレンジアミン系老化防止剤、フェノール系老化防止剤、ジフェニルアミン系老化防止剤、キノリン系老化防止剤、イミダゾール系老化防止剤、ワックス類等があげられる。これらは単独でもしくは二種以上併せて用いられる。 《Anti-aging agent》
Examples of the anti-aging agent 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.
前記軟化剤(プロセスオイル)としては、例えば、ナフテン系オイル、パラフィン系オイル、アロマ系オイル等があげられる。これらは単独でもしくは二種以上併せて用いられる。 《Softener》
Examples of the softening agent (process oil) include naphthenic oil, paraffinic oil, and aromatic oil. These are used alone or in combination of two or more.
なお、先にも述べたように、本ゴム組成物においては、前記特定の液状ゴム(C)が軟化剤としての機能を示すことから、軟化剤を不含としても、所望の性能を発揮することができる。 In the present rubber composition, 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.
As mentioned above, in the present rubber composition, since 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.
そして、前記ゴム組成物は、前記の各材料を配合したものを、ニーダー,バンバリーミキサー,オープンロール,2軸スクリュー式撹拌機等の混練機を用いて混練することにより、調製することができる。 The rubber composition, which is the material of the
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.
そして、下部取付板4上に、前記ゴム層2用材料であるゴム組成物をシート状に成形して所定の寸法に打ち抜いた未加硫ゴムシートと硬質板1とを交互に重ね、最後に、上部取付板3を重ねることにより、積層体(ゴム支承体)を作製する。なお、前記硬質板1等の積層面には、予め、接着剤を塗布しておいてもよい。
つぎに、先に記載のようにして調製した本ゴム組成物をシート状に成形して、未加硫ゴムシートを作製する。前記未加硫ゴムシートは、完全に架橋しない程度(加硫接着性が得られる程度)に半架橋させた状態のものであり、その成形条件は、厚みによっても異なるが、通常、130~180℃で1~30分間加熱し、半架橋させたものである。そして、前記未加硫ゴムシートを、前記積層体(ゴム支承体)の外側面を囲うように被覆した後、このものを所定の金型内にセットし、前記未加硫ゴムシートを130~180℃で1~24時間加熱して架橋し、ゴム支承体に加硫接着させることにより、本ゴム組成物からなる側面材5を備えたゴム支承体(本ゴム支承体)を製造することができる。
なお、前記積層体(ゴム支承体)は、硬質板1、上部取付板3、および下部取付板4を、所定の配置となるよう成形金型内にセットし、この成形金型内の空隙に、ゴム層2用材料であるゴム組成物を射出成形等により注入して加熱加硫した後脱型することによっても、製造することができる。 Here, the present rubber bearing (see FIG. 1) is produced, for example, as follows. That is, first, a rubber composition as a material for the
Then, on the
Next, 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. Then, after the unvulcanized rubber sheet is coated so as to surround the outer surface of the laminate (rubber bearing), 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
The laminate (rubber bearing) is formed by setting the hard plate 1, the upper mounting plate 3, and the
前記架橋の際の加熱条件は、先の製造方法に準じる。但し、先の製造方法のように半架橋させる工程は必要ではなく、そのまま加熱して架橋させればよい。 After setting the rubber bearing in a predetermined mold, the
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.
天然ゴム [NR]
natural rubber
日本ゼオン社製、製品名:Nipol IR2200 [IR]
Nippon Zeon Co., Ltd., product name: Nipol IR2200
三井化学社製、製品名:三井EPT 9090M(エチレン含有量:41質量%、ジエン含有量:14質量%) [EPDM(i)]
Mitsui Chemicals, Inc., product name: Mitsui EPT 9090M (ethylene content: 41% by mass, diene content: 14% by mass)
JSR社製、製品名:EP331(エチレン含有量:47質量%、ジエン含有量:11.3質量%) [EPDM (ii)]
JSR Corporation, product name: EP331 (ethylene content: 47% by mass, diene content: 11.3% by mass)
住友化学社製、製品名:エスプレン505(エチレン含有量:50質量%、ジエン含有量:10質量%) [EPDM (iii)]
Sumitomo Chemical Co., Ltd., product name: Esprene 505 (ethylene content: 50% by mass, diene content: 10% by mass)
三井化学社製、製品名:三井EPT 8030M(エチレン含有量:47質量%、ジエン含有量:9.5質量%) [EPDM (iv)]
Mitsui Chemicals, product name: Mitsui EPT 8030M (ethylene content: 47% by mass, diene content: 9.5% by mass)
LANXESS社製、製品名:Keltan K3960Q(エチレン含有量:56質量%、ジエン含有量:11.4質量%) [EPDM(v)]
LANXESS, product name: Keltan K3960Q (ethylene content: 56% by mass, diene content: 11.4% by mass)
クラレ社製、製品名:LIR-30(重量平均分子量:28000) [Liquid rubber (i)]
Kuraray Co., Ltd., product name: LIR-30 (weight average molecular weight: 28000)
クラレ社製、製品名:LIR-50(重量平均分子量:54000) [Liquid rubber (ii)]
Kuraray Co., Ltd., product name: LIR-50 (weight average molecular weight: 54000)
EVONIK社製、製品名:POLYVEST110(分子量:1100) [Liquid rubber (iii)]
EVONIK, product name: POLYVEST110 (molecular weight: 1100)
日本サン石油社製、製品名:Sunpar110 [Softener]
Japan Sun Oil Co., Ltd., product name: Sunpar110
前記各ポリマー成分および軟化剤を後記の表1および表2に示す割合で配合し、さらに、ステアリン酸(日油社製、製品名:ビーズステアリン酸さくら)2質量部と、酸化亜鉛(堺化学工業社製、製品名:酸化亜鉛二種)5質量部と、アミン系老化防止剤(精工化学社製、製品名:オゾノン6C)3質量部と、ワックス(大内新興化学社製、製品名:サンノック)4質量部と、SAF級カーボンブラック(東海カーボン社製、製品名:シースト9M)35質量部と、スルフェンアミド系加硫促進剤(大内新興化学社製、製品名:ノクセラーCZ-G)1質量部と、硫黄(鶴見化学工業社製、製品名:金華印微粉硫黄)1質量部とを加えて配合し、バンバリーミキサーおよびオープンロールを用いて混練して、ゴム組成物(ゴム支承体側壁用ゴム組成物)を調製した。具体的には、加硫剤および加硫促進剤を除く成分を、バンバリーミキサーで5分間混練し、150℃に達したときに放出し、マスターバッチを得た後、そのマスターバッチに、加硫剤および加硫促進剤を同表に示す割合で配合し、これらをオープンロールで混練して、前記ゴム組成物を調製した。 [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 part by mass of sulfur (manufactured by Tsurumi Chemical Industry Co., Ltd., product name: Kinkain fine powder sulfur) are added and blended, kneaded using a Banbury mixer and an open roll, and a rubber composition ( A rubber composition for side walls of a rubber bearing body) was prepared. Specifically, 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.
得られた各ゴム組成物を用い、150℃×20分の条件でプレス成形(加硫)して、厚み2mmのゴムシートを作製した。そして、このゴムシートから、JIS5号ダンベルを打ち抜き、JIS K 6251に準拠して、25℃雰囲気下における引張強さ(引張強度)を測定した。
そして、前記引張強度が、20MPa以上のものを「◎(excellent)」、15MPa以上20MPa未満のものを「○(very good)」、10MPa以上15MPa未満のものを「△(good)」、10MPa未満のものを「×(poor)」と評価した。 <Tensile strength>
Using each of the obtained rubber compositions, press molding (vulcanization) was performed at 150° C. for 20 minutes to prepare a rubber sheet having a thickness of 2 mm. A JIS No. 5 dumbbell was punched out from this rubber sheet, and the tensile strength (tensile strength) in an atmosphere at 25° C. was measured according to JIS K 6251.
Then, the tensile strength is "excellent" when it is 20 MPa or more, "○ (very good)" when it is 15 MPa or more and less than 20 MPa, "Δ (good)" when it is 10 MPa or more and less than 15 MPa, and less than 10 MPa. was evaluated as "x (poor)".
得られた各ゴム組成物を用い、150℃×30分の加硫条件を採用して、JIS K 6394「加硫ゴム及び熱可塑性ゴムの動的性質試験法」に規定されている金具付円柱状の剪断方法用試験片を作製した。その後、得られた各試験片を用いて、JIS K 6394(1998)に規定される「6.大型試験装置による動的性質試験」に従って、試験温度:-30℃、20℃、試験振動数:0.5Hz、歪み振幅(剪断):250%の条件下において、それぞれ、荷重/撓み曲線を11回連続して測定した。
そして、得られた2回目から11回目までの計10回の荷重/撓み曲線から、各測定温度での等価剛性:Keq(-30℃)、Keq(20℃)を求めた。得られた等価剛性を用い、以下の式から、G(温度依存性)をそれぞれ算出した。そして、Gが1.5未満のものを「○(very good)」、Gが1.5以上1.6未満のものを「△(good)」、Gが1.6以上のものを「×(poor)」と評価した。
G(温度依存性)=Keq(-30℃)/Keq(20℃) <Low temperature resistance>
Using each of the obtained rubber compositions, a circle with metal fittings specified in JIS K 6394 "Testing methods for dynamic properties of vulcanized rubber and thermoplastic rubber" was applied under vulcanization conditions of 150 ° C. for 30 minutes. A columnar shear test specimen was prepared. After that, using each of the obtained test pieces, test temperature: -30 ° C., 20 ° C., test frequency: Under the conditions of 0.5 Hz and strain amplitude (shear): 250%, the load/deflection curves were measured continuously 11 times.
Equivalent stiffnesses 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. Using the obtained equivalent stiffness, 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)
得られた各ゴム組成物を用い、鉄板上で150℃×30分加熱して加硫(加硫接着)させた。このようにして得られた試験片における、鉄板とゴムとの間の接着性について、JIS K 6256の「加硫ゴムの接着試験方法」における「5.金属片とゴムの90度はく離試験」に準拠して、鉄板に接着したゴムを90度の方向に剥離して、その剥離部分の状態を目視観察した。そして、ゴム部の破損割合が100%のものを「○(very good)」、ゴム部と鉄板との間に界面剥離している部分があるものを「×(poor)」と評価した。 <Adhesion>
Each of the obtained rubber compositions was heated on an iron plate at 150° C. for 30 minutes for vulcanization (vulcanization adhesion). Regarding the adhesion between the iron plate and the rubber in the test piece thus obtained, it is determined in JIS K 6256 "Adhesion test method for vulcanized rubber" in "5. 90 degree peeling test between metal piece and rubber". Accordingly, the rubber adhered to the iron plate was peeled off at an angle of 90 degrees, and the state of the peeled portion was visually observed. A sample with a rubber part having a breakage rate of 100% was evaluated as "good (very good)", and a sample with a portion of interface peeling between the rubber part and the iron plate was evaluated as "poor (poor)".
得られた各ゴム組成物を用い、150℃×20分の条件でプレス成形(加硫)して、厚み2mmのゴムシートを作製した。このゴムシートから、JIS1号ダンベルを打ち抜き、試験片を作製した。そして、JIS K 6259に準拠して、オゾン濃度200±20pphm、温度40℃のオゾン槽内に、前記試験片を、引張ひずみ80±2%を与えた状態で投入した。前記投入から672時間後において、前記試験片における亀裂の発生の有無を目視観察し、亀裂がないものを「〇(very good)」、亀裂があるものを「×(poor)」と評価した。 <Ozone resistance>
Using each of the obtained rubber compositions, press molding (vulcanization) was performed at 150° C. for 20 minutes to prepare a rubber sheet having a thickness of 2 mm. A JIS No. 1 dumbbell was punched from this rubber sheet to prepare a test piece. Then, according to JIS K 6259, the test piece was placed in an ozone bath having an ozone concentration of 200±20 pphm and a temperature of 40° C. with a tensile strain of 80±2%. After 672 hours from the charging, the presence or absence of cracks in the test pieces was visually observed, and those without cracks were evaluated as "very good", and those with cracks were evaluated as "x (poor)".
そのため、実施例のゴム組成物は、図1に示すような、橋梁用途や建築物用途の免震支承体の側面材の材料として優れていると判断される。 From the results in Table 1 above, 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.
2 ゴム層
5 側面材 REFERENCE SIGNS LIST 1
Claims (4)
- 下記の(A)~(C)をポリマー成分とする、ゴム支承体側壁用ゴム組成物。
(A)天然ゴムおよびイソプレンゴムの少なくとも一方を主成分とするジエン系ゴム。但し、エチレン-プロピレン-ジエン三元共重合体および液状ゴムを含まない。
(B)ジエン含有量が10質量%以上、エチレン含有量が55質量%以下の、エチレン-プロピレン-ジエン三元共重合体。
(C)分子量が1000~60000の液状ゴム。 A rubber composition for a side wall of a rubber bearing, comprising the following (A) to (C) as polymer components.
(A) A diene rubber containing at least one of natural rubber and isoprene rubber as a main component. However, ethylene-propylene-diene terpolymer and liquid rubber are not included.
(B) An ethylene-propylene-diene terpolymer 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. - 前記(A)と(B)が、質量比で、(A)/(B)=50/50~90/10の割合になっている、請求項1記載のゴム支承体側壁用ゴム組成物。 The rubber composition for the side wall of a rubber bearing body according to claim 1, wherein (A) and (B) have a mass ratio of (A)/(B) = 50/50 to 90/10.
- 前記(C)が、前記(A)と(B)の合計量100質量部に対し、5~30質量部の割合になっている、請求項1または2記載のゴム支承体側壁用ゴム組成物。 3. The rubber composition for a side wall of a rubber bearing body according to claim 1, wherein (C) is in a proportion of 5 to 30 parts by mass with respect to 100 parts by mass of the total amount of (A) and (B). .
- ゴムと硬質板とが交互に積層されたゴム支承体であって、
前記ゴム支承体は、その外側面を囲うように被覆ゴムからなる側面材を有し、
前記被覆ゴムは、請求項1~3のいずれか一項に記載のゴム支承体側壁用ゴム組成物の架橋体からなる、ゴム支承体。 A rubber bearing body in which rubber and hard plates are alternately laminated,
The rubber bearing body has a side member made of coated rubber so as to surround its outer surface,
A rubber bearing, wherein the covering rubber comprises a crosslinked product of the rubber composition for side walls of a rubber bearing according to any one of claims 1 to 3.
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JP2009001603A (en) * | 2007-06-19 | 2009-01-08 | Bridgestone Corp | Rubber sheet for rubber support coating, and coating material for rubber support |
JP2012211277A (en) * | 2011-03-31 | 2012-11-01 | Yokohama Rubber Co Ltd:The | Rubber composition for rubber bearing wall, and rubber bearing |
JP2013035943A (en) * | 2011-08-08 | 2013-02-21 | Bridgestone Corp | Rubber composition for rubber bearing coating, and rubber for rubber bearing coating using the same |
JP2017137414A (en) * | 2016-02-03 | 2017-08-10 | 中日本高速技術マーケティング株式会社 | Coated rubber composition |
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JP2009001603A (en) * | 2007-06-19 | 2009-01-08 | Bridgestone Corp | Rubber sheet for rubber support coating, and coating material for rubber support |
JP2012211277A (en) * | 2011-03-31 | 2012-11-01 | Yokohama Rubber Co Ltd:The | Rubber composition for rubber bearing wall, and rubber bearing |
JP2013035943A (en) * | 2011-08-08 | 2013-02-21 | Bridgestone Corp | Rubber composition for rubber bearing coating, and rubber for rubber bearing coating using the same |
JP2017137414A (en) * | 2016-02-03 | 2017-08-10 | 中日本高速技術マーケティング株式会社 | Coated rubber composition |
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