JP6348369B2 - ゴム組成物及び空気入りタイヤ - Google Patents
ゴム組成物及び空気入りタイヤ Download PDFInfo
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- JP6348369B2 JP6348369B2 JP2014164906A JP2014164906A JP6348369B2 JP 6348369 B2 JP6348369 B2 JP 6348369B2 JP 2014164906 A JP2014164906 A JP 2014164906A JP 2014164906 A JP2014164906 A JP 2014164906A JP 6348369 B2 JP6348369 B2 JP 6348369B2
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- JP
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- Prior art keywords
- rubber
- silica
- mass
- rubber composition
- microfibril cellulose
- Prior art date
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- 229920001971 elastomer Polymers 0.000 title claims description 91
- 239000005060 rubber Substances 0.000 title claims description 91
- 239000000203 mixture Substances 0.000 title claims description 63
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 141
- 229920002678 cellulose Polymers 0.000 claims description 105
- 239000001913 cellulose Substances 0.000 claims description 105
- 210000001724 microfibril Anatomy 0.000 claims description 91
- 239000000377 silicon dioxide Substances 0.000 claims description 70
- 239000011812 mixed powder Substances 0.000 claims description 38
- 238000002156 mixing Methods 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 19
- 244000043261 Hevea brasiliensis Species 0.000 claims description 13
- 229920003052 natural elastomer Polymers 0.000 claims description 13
- 229920001194 natural rubber Polymers 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 13
- 239000005062 Polybutadiene Substances 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 11
- 229920002857 polybutadiene Polymers 0.000 claims description 11
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 235000010980 cellulose Nutrition 0.000 description 101
- 238000000034 method Methods 0.000 description 32
- -1 recycled pulp Substances 0.000 description 22
- 239000000306 component Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 14
- 239000003795 chemical substances by application Substances 0.000 description 13
- 239000006087 Silane Coupling Agent Substances 0.000 description 11
- 239000006229 carbon black Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004073 vulcanization Methods 0.000 description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000011593 sulfur Substances 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 6
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 6
- 230000032050 esterification Effects 0.000 description 6
- 238000005886 esterification reaction Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 235000019198 oils Nutrition 0.000 description 6
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 5
- 229920003043 Cellulose fiber Polymers 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
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- 238000003756 stirring Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000003712 anti-aging effect Effects 0.000 description 4
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
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- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 4
- OWRCNXZUPFZXOS-UHFFFAOYSA-N 1,3-diphenylguanidine Chemical compound C=1C=CC=CC=1NC(=N)NC1=CC=CC=C1 OWRCNXZUPFZXOS-UHFFFAOYSA-N 0.000 description 3
- UJPKMTDFFUTLGM-UHFFFAOYSA-N 1-aminoethanol Chemical compound CC(N)O UJPKMTDFFUTLGM-UHFFFAOYSA-N 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 3
- 229920000459 Nitrile rubber Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 238000006640 acetylation reaction Methods 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 3
- 238000006266 etherification reaction Methods 0.000 description 3
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000012744 reinforcing agent Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 3
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-D Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 2
- 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
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229920002749 Bacterial cellulose Polymers 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 2
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 2
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 2
- 240000000491 Corchorus aestuans Species 0.000 description 2
- 235000011777 Corchorus aestuans Nutrition 0.000 description 2
- 235000010862 Corchorus capsularis Nutrition 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- 240000000797 Hibiscus cannabinus Species 0.000 description 2
- 235000019482 Palm oil Nutrition 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 244000082204 Phyllostachys viridis Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 238000003436 Schotten-Baumann reaction Methods 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000021736 acetylation Effects 0.000 description 2
- 238000005576 amination reaction Methods 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
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- 238000004364 calculation method Methods 0.000 description 2
- 235000009120 camo Nutrition 0.000 description 2
- DKVNPHBNOWQYFE-UHFFFAOYSA-N carbamodithioic acid Chemical compound NC(S)=S DKVNPHBNOWQYFE-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 235000005607 chanvre indien Nutrition 0.000 description 2
- 238000007385 chemical modification Methods 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000005660 chlorination reaction 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
- 229920003244 diene elastomer Polymers 0.000 description 2
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- AUZONCFQVSMFAP-UHFFFAOYSA-N disulfiram Chemical compound CCN(CC)C(=S)SSC(=S)N(CC)CC AUZONCFQVSMFAP-UHFFFAOYSA-N 0.000 description 2
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- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
- IUJLOAKJZQBENM-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)-2-methylpropan-2-amine Chemical compound C1=CC=C2SC(SNC(C)(C)C)=NC2=C1 IUJLOAKJZQBENM-UHFFFAOYSA-N 0.000 description 2
- 229930014626 natural product Natural products 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
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- 150000001451 organic peroxides Chemical class 0.000 description 2
- 239000002540 palm oil Substances 0.000 description 2
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- 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 2
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- RKQOSDAEEGPRER-UHFFFAOYSA-L zinc diethyldithiocarbamate Chemical compound [Zn+2].CCN(CC)C([S-])=S.CCN(CC)C([S-])=S RKQOSDAEEGPRER-UHFFFAOYSA-L 0.000 description 1
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- JGSUMMPGKPITGK-UHFFFAOYSA-L zinc;n,n-dipentylcarbamodithioate Chemical compound [Zn+2].CCCCCN(C([S-])=S)CCCCC.CCCCCN(C([S-])=S)CCCCC JGSUMMPGKPITGK-UHFFFAOYSA-L 0.000 description 1
- QUPAJUAGQJQKQE-UHFFFAOYSA-L zinc;n,n-dipropylcarbamodithioate Chemical compound [Zn+2].CCCN(C([S-])=S)CCC.CCCN(C([S-])=S)CCC QUPAJUAGQJQKQE-UHFFFAOYSA-L 0.000 description 1
- LAGTXXPOZSLGSF-UHFFFAOYSA-L zinc;n-butyl-n-phenylcarbamodithioate Chemical compound [Zn+2].CCCCN(C([S-])=S)C1=CC=CC=C1.CCCCN(C([S-])=S)C1=CC=CC=C1 LAGTXXPOZSLGSF-UHFFFAOYSA-L 0.000 description 1
- KMNUDJAXRXUZQS-UHFFFAOYSA-L zinc;n-ethyl-n-phenylcarbamodithioate Chemical compound [Zn+2].CCN(C([S-])=S)C1=CC=CC=C1.CCN(C([S-])=S)C1=CC=CC=C1 KMNUDJAXRXUZQS-UHFFFAOYSA-L 0.000 description 1
- YBKBEKGVHFHCRI-UHFFFAOYSA-L zinc;piperidine-1-carbodithioate Chemical compound [Zn+2].[S-]C(=S)N1CCCCC1.[S-]C(=S)N1CCCCC1 YBKBEKGVHFHCRI-UHFFFAOYSA-L 0.000 description 1
- DUBNHZYBDBBJHD-UHFFFAOYSA-L ziram Chemical compound [Zn+2].CN(C)C([S-])=S.CN(C)C([S-])=S DUBNHZYBDBBJHD-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
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Description
本発明において用いられるゴム成分としては、タイヤ用途等に用いられる一般的なゴムを好適に使用することができ、天然ゴム、変性天然ゴム、及び合成ゴムからなる群より選択される少なくとも1種であることが好ましい。より具体的には、例えば、ブタジエンゴム、スチレンブタジエンゴム、変性スチレンブタジエンゴム、イソプレンゴム、天然ゴム、変性天然ゴム、アクリロニトリルブタジエンゴム等を例示できる。
上記変性天然ゴムとしては、エポキシ化天然ゴム、水素化天然ゴム等を例示できる。
本発明に係るゴム組成物は、シリカ及びミクロフィブリルセルロースを含む混合粉体を含有する。該混合粉体は、シリカ及びミクロフィブリルセルロースを含む限り、その他の成分を含んでいてもよい。
なお、シリカのN2SAは、ASTM D3037−93に準じてBET法で測定される値である。
上記溶媒としては、シリカ及びミクロフィブリルセルロースを混合する際に用いることができるものであれば特に制限されないが、例えば、水、エタノール、アセトン、トルエンなどが挙げられる。なかでも、水、エタノールが好適に使用できる。
また、本発明のゴム組成物が、混合粉体に含まれるミクロフィブリルセルロースとは別に、更にミクロフィブリルセルロースを含む場合には、ゴム組成物中のミクロフィブリルセルロースの総含有量が、上述したミクロフィブリルセルロースの含有量範囲内であることが好ましい。
本発明のゴム組成物には、上記した成分以外に、従来ゴム工業で使用される他の配合剤、例えば、補強剤、シランカップリング剤、加硫剤、加硫促進剤、加硫促進助剤、オイル、硬化レジン、ワックス、老化防止剤などを配合することができる。
また、本発明のゴム組成物が、混合粉体に含まれるシリカとは別に、更にシリカを含む場合には、ゴム組成物中のシリカの総含有量が、上述したシリカの含有量範囲内であることが好ましい。
なお、カーボンブラックのN2SAは、JIS K 6217−2:2001によって求められる。
なお、カーボンブラックのDBPは、JIS K6217−4:2001に準拠して測定される。
上記老化防止剤としては、アミン系、フェノール系、イミダゾール系の老化防止剤や、カルバミン酸金属塩などを適宜選択して使用することができる。
本発明のゴム組成物は、上記のシリカ及びミクロフィブリルセルロースを含む混合粉体とゴム成分、その他の必要な配合剤とを、例えば、ゴム用混練機等を用いて従来公知の方法で混合し、従来公知の方法で加硫することにより得られる。
本発明はまた、上述したような本発明のゴム組成物を用いて作製した空気入りタイヤを提供する。本発明のゴム組成物は、トレッド部、サイドウォール部、ビード部、カーカス部、ビードエイペックス、クリンチ、ベーストレッド部、又は、ランフラットタイヤのインサートゴム等に使用できる。なかでも、トレッド部、サイドウォール部に使用することが好ましい。
シリカ:ローディア社製のZEOSIL 1165MP(N2SA:160m2/g)
ミクロフィブリルセルロース:セリッシュKY−100G(ダイセル化学工業(株)製、固形分:10質量%、水分:90質量%、平均繊維径:0.02μm、平均繊維長:0.5mm)
ホモジナイザー:IKA社製パッチ式ホモジナイザー T65Dウルトラタラックス(回転数:7000rpm)
(調製例1〜3)
表1に示す混合比率に従い、水中に分散しているシリカとミクロフィブリルセルロースを、ホモジナイザーを用いて混合した(回転数:7000rpm、混合時間:30分)。なお、この際、水中でのシリカ及びミクロフィブリルセルロースを合わせた合計濃度が10w/v%となるように、適宜水を添加する等して調整した。その後、80℃のオーブンで72時間乾燥してシリカ及びミクロフィブリルセルロースを含む混合粉体(シリカ/ミクロフィブリルセルロース混合粉体A〜C)を得た。
SBR:日本ゼオン(株)製のNipol NS116R(結合スチレン量:21質量%)
天然ゴム:TSR20
ブタジエンゴム:宇部興産(株)製のウベポールBR150B(シス含量:97質量%)
ミクロフィブリルセルロース:セリッシュKY−100G(ダイセル化学工業(株)製、固形分:10質量%、水分:90質量%、平均繊維径:0.02μm、平均繊維長:0.5mm)
シリカ/ミクロフィブリルセルロース混合粉体A〜C:調製例1〜3で得られたシリカ/ミクロフィブリルセルロース混合粉体A〜C
シリカ:ローディア社製のZEOSIL 1165MP(N2SA:160m2/g)
シランカップリング剤:EVONIK−DEGUSSA社製のSi69(ビス(3−トリエトキシシリルプロピル)テトラスルフィド)
カーボンブラック:三菱化学(株)製のダイアブラックN339(N2SA:96m2/g、DBP:124ml/100g)
オイル:(株)ジャパンエナジー製のX−140
老化防止剤:住友化学(株)製のアンチゲン3C(N−フェニル−N′−イソプロピル−p−フェニレンジアミン)
ステアリン酸:日油(株)製のビーズステアリン酸つばき
酸化亜鉛:三井金属鉱業(株)製の亜鉛華1号
ワックス:大内新興化学工業(株)製のサンノックN
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤1:住友化学(株)製のソクシノールCZ(N−シクロヘキシル−2−ベンゾチアゾールスルフェンアミド)
加硫促進剤2:住友化学(株)製のソクシノールD(ジフェニルグアニジン)
(実施例及び比較例)
表2に示す配合内容に従い、(株)神戸製鋼所製の1.7Lバンバリーミキサーを用いて、硫黄及び加硫促進剤以外の材料を150℃で5分間混練りし、混練り物を得た。次に得られた混練り物に硫黄及び加硫促進剤を添加し、オープンロールを用いて、80℃で5分間練り込み、未加硫ゴム組成物を得た。得られた未加硫ゴム組成物を170℃で20分間、0.5mm厚の金型でプレス加硫し、加硫ゴム組成物を得た。
(株)上島製作所製スペクトロメーターを用いて、動的歪振幅1%、周波数10Hz、温度50℃で、加硫ゴム組成物の損失正接(tanδ)を測定した。tanδの逆数の値について比較例1を100として指数表示した(低発熱性指数)。数値が大きいほど転がり抵抗が小さく(発熱しにくく、エネルギーロスが低く)、タイヤの転がり抵抗特性(低燃費性)に優れることを示している。
(引張試験)
JIS K6251「加硫ゴムおよび熱可塑性ゴム−引張特性の求め方」に従い引張試験を実施し、加硫ゴム組成物の引張強度及び破断伸びを測定した。下記計算式により、比較例1の引張強度及び破断伸びをそれぞれ100として、引張強度指数及び破断伸び指数を算出した。各々の指数が大きい程、加硫ゴム組成物が良好に補強されており、ゴムの機械強度が大きく、破断特性に優れることを示す。
(引張強度指数)=(各配合の引張強度)÷(比較例1の引張強度)×100
(破断伸び指数)=(各配合の破断伸び)÷(比較例1の破断伸び)×100
(引裂試験)
JIS K6252「加硫ゴムおよび熱可塑性ゴム−引裂強さの求め方」に従い、切り込みなしのアングル型試験片を用いて引裂試験を実施し、加硫ゴム組成物の引裂強さ(N/mm)を測定した。下記計算式により、比較例1の引裂強さを100として、引裂強度指数を算出した。指数が大きい程、引裂強さが大きく、特にサイドウォール用ゴム組成物等として優れていることを示す。
(引裂強度指数)=(各配合の引裂強さ)÷(比較例1の引裂強さ)×100
Claims (5)
- ゴム成分と、シリカ及びミクロフィブリルセルロースを含む混合粉体とを含有し、
前記ゴム成分が、天然ゴム、ブタジエンゴム、及びスチレンブタジエンゴムを含み、
前記混合粉体が、シリカ及びミクロフィブリルセルロースを溶媒中で混合、乾燥して調製され、
前記ゴム成分100質量部に対して、前記ミクロフィブリルセルロースの含有量が1〜50質量部であることを特徴とするゴム組成物。 - 前記シリカの窒素吸着比表面積が、40〜400m2/gである請求項1に記載のゴム組成物。
- 前記ミクロフィブリルセルロースの平均繊維径が、4nm〜1μmである請求項1又は2に記載のゴム組成物。
- 前記混合粉体中のシリカの配合割合が、30質量%以上である請求項1〜3のいずれかに記載のゴム組成物。
- 請求項1〜4のいずれかに記載のゴム組成物を用いて作製した空気入りタイヤ。
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