JP2020066326A - 重荷重用空気入りタイヤ - Google Patents
重荷重用空気入りタイヤ Download PDFInfo
- Publication number
- JP2020066326A JP2020066326A JP2018200013A JP2018200013A JP2020066326A JP 2020066326 A JP2020066326 A JP 2020066326A JP 2018200013 A JP2018200013 A JP 2018200013A JP 2018200013 A JP2018200013 A JP 2018200013A JP 2020066326 A JP2020066326 A JP 2020066326A
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- Prior art keywords
- mass
- rubber
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- parts
- carbon black
- Prior art date
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- Granted
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- 229920001971 elastomer Polymers 0.000 claims abstract description 121
- 239000005060 rubber Substances 0.000 claims abstract description 121
- 239000006229 carbon black Substances 0.000 claims abstract description 58
- 239000000203 mixture Substances 0.000 claims abstract description 53
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 42
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000001179 sorption measurement Methods 0.000 claims abstract description 17
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 45
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 39
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims description 34
- 239000002174 Styrene-butadiene Substances 0.000 claims description 27
- 238000005299 abrasion Methods 0.000 claims description 21
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 10
- 239000011115 styrene butadiene Substances 0.000 claims description 9
- 229920003049 isoprene rubber Polymers 0.000 abstract description 9
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- 229920002857 polybutadiene Polymers 0.000 abstract description 6
- 241000872198 Serjania polyphylla Species 0.000 abstract 1
- 235000019241 carbon black Nutrition 0.000 description 55
- 239000011347 resin Substances 0.000 description 39
- 229920005989 resin Polymers 0.000 description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 37
- -1 hydrazo group Chemical group 0.000 description 30
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 24
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 24
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 24
- 239000007788 liquid Substances 0.000 description 22
- 238000004073 vulcanization Methods 0.000 description 21
- 239000000047 product Substances 0.000 description 18
- 239000000377 silicon dioxide Substances 0.000 description 18
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- 239000003795 chemical substances by application Substances 0.000 description 16
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 13
- 229910052717 sulfur Inorganic materials 0.000 description 13
- 125000000524 functional group Chemical group 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 12
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- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 10
- 238000004898 kneading Methods 0.000 description 10
- XMGQYMWWDOXHJM-UHFFFAOYSA-N limonene Chemical compound CC(=C)C1CCC(C)=CC1 XMGQYMWWDOXHJM-UHFFFAOYSA-N 0.000 description 10
- 244000043261 Hevea brasiliensis Species 0.000 description 9
- 125000003277 amino group Chemical group 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 9
- 229920003052 natural elastomer Polymers 0.000 description 9
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- 150000003505 terpenes Chemical class 0.000 description 9
- GRWFGVWFFZKLTI-IUCAKERBSA-N (-)-α-pinene Chemical compound CC1=CC[C@@H]2C(C)(C)[C@H]1C2 GRWFGVWFFZKLTI-IUCAKERBSA-N 0.000 description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 230000003712 anti-aging effect Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- BGNGWHSBYQYVRX-UHFFFAOYSA-N 4-(dimethylamino)benzaldehyde Chemical compound CN(C)C1=CC=C(C=O)C=C1 BGNGWHSBYQYVRX-UHFFFAOYSA-N 0.000 description 7
- 230000020169 heat generation Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
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- 239000002994 raw material Substances 0.000 description 6
- 239000003981 vehicle Substances 0.000 description 6
- 239000001993 wax Substances 0.000 description 6
- 239000006087 Silane Coupling Agent Substances 0.000 description 5
- 239000004902 Softening Agent Substances 0.000 description 5
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 5
- 125000003700 epoxy group Chemical group 0.000 description 5
- WTARULDDTDQWMU-RKDXNWHRSA-N (+)-β-pinene Chemical compound C1[C@H]2C(C)(C)[C@@H]1CCC2=C WTARULDDTDQWMU-RKDXNWHRSA-N 0.000 description 4
- WTARULDDTDQWMU-IUCAKERBSA-N (-)-Nopinene Natural products C1[C@@H]2C(C)(C)[C@H]1CCC2=C WTARULDDTDQWMU-IUCAKERBSA-N 0.000 description 4
- JSNRRGGBADWTMC-UHFFFAOYSA-N (6E)-7,11-dimethyl-3-methylene-1,6,10-dodecatriene Chemical compound CC(C)=CCCC(C)=CCCC(=C)C=C JSNRRGGBADWTMC-UHFFFAOYSA-N 0.000 description 4
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 4
- 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 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- WTARULDDTDQWMU-UHFFFAOYSA-N Pseudopinene Natural products C1C2C(C)(C)C1CCC2=C WTARULDDTDQWMU-UHFFFAOYSA-N 0.000 description 4
- XCPQUQHBVVXMRQ-UHFFFAOYSA-N alpha-Fenchene Natural products C1CC2C(=C)CC1C2(C)C XCPQUQHBVVXMRQ-UHFFFAOYSA-N 0.000 description 4
- MVNCAPSFBDBCGF-UHFFFAOYSA-N alpha-pinene Natural products CC1=CCC23C1CC2C3(C)C MVNCAPSFBDBCGF-UHFFFAOYSA-N 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- 229930006722 beta-pinene Natural products 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 4
- 150000001993 dienes Chemical class 0.000 description 4
- LCWMKIHBLJLORW-UHFFFAOYSA-N gamma-carene Natural products C1CC(=C)CC2C(C)(C)C21 LCWMKIHBLJLORW-UHFFFAOYSA-N 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 230000000379 polymerizing effect Effects 0.000 description 4
- GRWFGVWFFZKLTI-UHFFFAOYSA-N rac-alpha-Pinene Natural products CC1=CCC2C(C)(C)C1C2 GRWFGVWFFZKLTI-UHFFFAOYSA-N 0.000 description 4
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 239000004636 vulcanized rubber Substances 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical compound C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-UHFFFAOYSA-N 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 125000003545 alkoxy group Chemical group 0.000 description 3
- 125000005370 alkoxysilyl group Chemical group 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910052740 iodine Inorganic materials 0.000 description 3
- 239000011630 iodine Substances 0.000 description 3
- 235000001510 limonene Nutrition 0.000 description 3
- 229940087305 limonene Drugs 0.000 description 3
- 239000000178 monomer Substances 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
- 239000012188 paraffin wax Substances 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
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- 239000008117 stearic acid Substances 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 3
- 125000003396 thiol group Chemical group [H]S* 0.000 description 3
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 3
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- CXENHBSYCFFKJS-UHFFFAOYSA-N (3E,6E)-3,7,11-Trimethyl-1,3,6,10-dodecatetraene Natural products CC(C)=CCCC(C)=CCC=C(C)C=C CXENHBSYCFFKJS-UHFFFAOYSA-N 0.000 description 2
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 2
- ZNRLMGFXSPUZNR-UHFFFAOYSA-N 2,2,4-trimethyl-1h-quinoline Chemical compound C1=CC=C2C(C)=CC(C)(C)NC2=C1 ZNRLMGFXSPUZNR-UHFFFAOYSA-N 0.000 description 2
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 2
- VVBLNCFGVYUYGU-UHFFFAOYSA-N 4,4'-Bis(dimethylamino)benzophenone Chemical compound C1=CC(N(C)C)=CC=C1C(=O)C1=CC=C(N(C)C)C=C1 VVBLNCFGVYUYGU-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
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- 229920002943 EPDM rubber Polymers 0.000 description 2
- WEEGYLXZBRQIMU-UHFFFAOYSA-N Eucalyptol Chemical compound C1CC2CCC1(C)OC2(C)C WEEGYLXZBRQIMU-UHFFFAOYSA-N 0.000 description 2
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- QOEUNLQGZBSTBB-UHFFFAOYSA-N 1-methylazetidin-2-one Chemical compound CN1CCC1=O QOEUNLQGZBSTBB-UHFFFAOYSA-N 0.000 description 1
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- JSXKIRYGYMKWSK-UHFFFAOYSA-N trimethoxy-[2-(2-trimethoxysilylethyltetrasulfanyl)ethyl]silane Chemical compound CO[Si](OC)(OC)CCSSSSCC[Si](OC)(OC)OC JSXKIRYGYMKWSK-UHFFFAOYSA-N 0.000 description 1
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- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
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- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
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Abstract
Description
先ず、従来のイソプレン系ゴム/ブタジエン系ゴム配合にスチレンブタジエン系ゴムをブレンドすることで、カーボンブラックとの補強性が向上し、耐摩耗性能が向上する。また、補強用充填剤として、所定のカーボンブラックを配合することで、ポリマーとの補強性が確保され、耐摩耗性能が向上する。つまり、イソプレン系ゴム/ブタジエン系ゴムのポリマーにスチレンブタジエン系ゴムを少量分散させることで、イソプレン系ゴム/ブタジエン系ゴム/スチレンブタジエン系ゴムの3相の状態となり、その各相の境界近傍に所定のカーボンブラックが分散されることで、各相間の結びつきが強固になり、結果、衝撃の吸収が可能なゴム組成物となり、耐摩耗性能が顕著に向上したものと推察される。更に、ランド比も所定以上の大きさに高めることで、トレッドとしての剛性を高め、エネルギーが分散することで、耐摩耗性能が向上する。以上の作用効果により、耐摩耗性能が顕著に(相乗的に)改善されたタイヤの提供が可能になると推察される。
図1には、本発明の一実施形態を示すタイヤ1のトレッド部2の展開図である。本実施形態のタイヤ1は、重荷重用の空気入りタイヤである。
なお、「ランド比」とは、正規状態において、トレッド部2のトレッド幅TWに設けられた全ての溝を埋めたと仮定した状態でのトレッド面の全表面積Saと、接地する接地面の全面積Scとの比(Sc/Sa)である。
なお、上記化合物(変性剤)による変性は公知の方法で実施可能である。
なお、BRのシス含量は、赤外吸収スペクトル分析法によって測定できる。
ここで、ゴム成分100質量%中の総スチレン量(質量%)は、Σ(各スチレン含有ゴムの含有量(質量%)×各スチレン含有ゴムのスチレン含有量(質量%)/100)である。例えば、ゴム成分が、NR30質量%、SBR(スチレン含有量23.5質量%)30質量%、BR40質量%からなる場合、ゴム成分100質量%中の総スチレン量は、7.05質量%(=30×23.5/100)である。
なお、カーボンブラックの平均粒子径は数平均粒子径であり、透過型電子顕微鏡により測定される。
なお、本明細書において、カーボンブラックのCTABは、JIS K6217−3:2001に準拠して測定される値である。
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、本明細書において、カーボンブラックのヨウ素吸着量(IA)は、JIS K6217−1:2001に準拠して測定される値である。
なお、カーボンブラックのDBPは、JIS K 6217−4:2001に準拠して測定される。
前記ゴム組成物にシリカを配合する場合、その含有量は、ゴム成分100質量部に対して、グリップ性能の観点から、好ましくは3.0質量部以上、より好ましくは5.0質量部以上である。該含有量は、好ましくは30質量部以下、より好ましくは20質量部以下、更に好ましくは15質量部以下である。
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。
シランカップリング剤としては、ゴム工業において、従来からシリカと併用される任意のシランカップリング剤を使用することができ特に限定されず、例えば、ビス(3−トリエトキシシリルプロピル)テトラスルフィド、ビス(2−トリエトキシシリルエチル)テトラスルフィド、ビス(4−トリエトキシシリルブチル)テトラスルフィド、ビス(3−トリメトキシシリルプロピル)テトラスルフィド、ビス(2−トリメトキシシリルエチル)テトラスルフィド、ビス(2−トリエトキシシリルエチル)トリスルフィド、ビス(4−トリメトキシシリルブチル)トリスルフィド、ビス(3−トリエトキシシリルプロピル)ジスルフィド、ビス(2−トリエトキシシリルエチル)ジスルフィド、ビス(4−トリエトキシシリルブチル)ジスルフィド、ビス(3−トリメトキシシリルプロピル)ジスルフィド、ビス(2−トリメトキシシリルエチル)ジスルフィド、ビス(4−トリメトキシシリルブチル)ジスルフィド、3−トリメトキシシリルプロピル−N,N−ジメチルチオカルバモイルテトラスルフィド、2−トリエトキシシリルエチル−N,N−ジメチルチオカルバモイルテトラスルフィド、3−トリエトキシシリルプロピルメタクリレートモノスルフィド、などのスルフィド系、3−メルカプトプロピルトリメトキシシラン、2−メルカプトエチルトリエトキシシラン、Momentive社製のNXT、NXT−Zなどのメルカプト系、ビニルトリエトキシシラン、ビニルトリメトキシシランなどのビニル系、3−アミノプロピルトリエトキシシラン、3−アミノプロピルトリメトキシシランなどのアミノ系、γ−グリシドキシプロピルトリエトキシシラン、γ−グリシドキシプロピルトリメトキシシラン、などのグリシドキシ系、3−ニトロプロピルトリメトキシシラン、3−ニトロプロピルトリエトキシシランなどのニトロ系、3−クロロプロピルトリメトキシシラン、3−クロロプロピルトリエトキシシランなどのクロロ系などが挙げられる。市販品としては、デグッサ社、Momentive社、信越シリコーン(株)、東京化成工業(株)、アヅマックス(株)、東レ・ダウコーニング(株)等の製品を使用できる。これらは、単独で用いてもよく、2種以上を併用してもよい。なかでも、スルフィド系、メルカプト系が好ましい。
なお、本発明において、液状ジエン系重合体のMwは、ゲル浸透クロマトグラフィー(GPC)で測定したポリスチレン換算値である。
い。なお、本明細書において、軟化剤の含有量には、油展ゴムに含まれるオイル量も含まれる。
なお、酸価は、後述する実施例に準拠して測定できる。なお、酸価が過度に高い場合などには、公知のエステル化処理によって、ロジン類のカルボキシル基を低減し、酸価を上記範囲に調整することも可能である。
硫黄としては、ゴム工業において一般的に用いられる粉末硫黄、沈降硫黄、コロイド硫黄、不溶性硫黄、高分散性硫黄、可溶性硫黄などが挙げられる。市販品としては、鶴見化学工業(株)、軽井沢硫黄(株)、四国化成工業(株)、フレクシス社、日本乾溜工業(株)、細井化学工業(株)等の製品を使用できる。これらは、単独で用いてもよく、2種以上を併用してもよい。
加硫促進剤としては、例えば、2−メルカプトベンゾチアゾール、ジ−2−ベンゾチアゾリルジスルフィド(DM(2,2’−ジベンゾチアゾリルジスルフィド))、N−シクロヘキシル−2−ベンゾチアジルスルフェンアミド等のチアゾール系加硫促進剤;テトラメチルチウラムジスルフィド(TMTD)、テトラベンジルチウラムジスルフィド(TBzTD)、テトラキス(2−エチルヘキシル)チウラムジスルフィド(TOT−N)等のチウラム系加硫促進剤;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、N−t−ブチル−2−ベンゾチアゾリルスルフェンアミド、N−オキシエチレン−2−ベンゾチアゾールスルフェンアミド、N−オキシエチレン−2−ベンゾチアゾールスルフェンアミド、N,N’−ジイソプロピル−2−ベンゾチアゾールスルフェンアミド等のスルフェンアミド系加硫促進剤;ジフェニルグアニジン、ジオルトトリルグアニジン、オルトトリルビグアニジン等のグアニジン系加硫促進剤を挙げることができる。これらは、単独で用いてもよく、2種以上を併用してもよい。なかでも、スルフェンアミド系、グアニジン系加硫促進剤が好ましい。
老化防止剤としては特に限定されず、例えば、フェニル−α−ナフチルアミン等のナフチルアミン系老化防止剤;オクチル化ジフェニルアミン、4,4’−ビス(α,α’−ジメチルベンジル)ジフェニルアミン等のジフェニルアミン系老化防止剤;N−イソプロピル−N’−フェニル−p−フェニレンジアミン、N−(1,3−ジメチルブチル)−N’−フェニル−p−フェニレンジアミン、N,N’−ジ−2−ナフチル−p−フェニレンジアミン等のp−フェニレンジアミン系老化防止剤;2,2,4−トリメチル−1,2−ジヒドロキノリンの重合物等のキノリン系老化防止剤;2,6−ジ−t−ブチル−4−メチルフェノール、スチレン化フェノール等のモノフェノール系老化防止剤;テトラキス−[メチレン−3−(3’,5’−ジ−t−ブチル−4’−ヒドロキシフェニル)プロピオネート]メタン等のビス、トリス、ポリフェノール系老化防止剤などが挙げられる。市販品としては、精工化学(株)、住友化学(株)、大内新興化学工業(株)、フレクシス社等の製品を使用できる。これらは単独で用いてもよいし、2種類以上を組み合わせて用いてもよい。なかでも、p−フェニレンジアミン系老化防止剤(より好ましくは、N−(1,3−ジメチルブチル)−N’−フェニル−p−フェニレンジアミン)が好ましい。
ステアリン酸としては、従来公知のものを使用でき、例えば、日油(株)、NOF社、花王(株)、富士フイルム和光純薬(株)、千葉脂肪酸(株)等の製品を使用できる。
酸化亜鉛としては、従来公知のものを使用でき、例えば、三井金属鉱業(株)、東邦亜鉛(株)、ハクスイテック(株)、正同化学工業(株)、堺化学工業(株)等の製品を使用できる。
なお、耐摩耗性能指数は、後述の実施例に記載の方法で得られる値である。
特表平8−507555号公報の実施例3の製法により、微粒子カーボンブラック1を製造した。
空気導入ダクトと燃焼バーナーを備える内径800mm、長さ1600mmの燃焼帯域、該燃焼帯域から連接され、周辺から原料ノズルを貫通接続した内径145mm、長さ1000mmの狭径部からなる原料導入帯域、クエンチ装置を備えた内径400mm、長さ3000mmの後部反応帯域を順次接合したカーボンブラック反応炉を用い、燃料にC重油、及び原料炭化水素にクレオソート油を使用し、各条件を設定して微粒子カーボンブラック2を製造した。
NR:TSR20
SBR:住友化学工業(株)製のSBR1502(スチレン含有量:23.5質量%)
BR:宇部興産(株)製のBR150B(シス含量:95質量%)
微粒子カーボンブラック1:製造例1(平均粒子径16nm、CTAB170m2/g、N2SA174m2/g、IA163mg/g、CTAB/IA1.04、DBP154cm3/100g)
微粒子カーボンブラック2:製造例2(平均粒子径16nm、CTAB158m2/g、N2SA170m2/g、IA145mg/g、CTAB/IA1.09、DBP138cm3/100g)
微粒子カーボンブラック3:N134(平均粒子径18nm、CTAB130m2/g、N2SA148m2/g、IA144mg/g、CTAB/IA0.90、DBP123cm3/100g)
カーボンブラック4:N220(平均粒子径22nm、CTAB115m2/g、N2SA115m2/g、IA118mg/g、CTAB/IA0.97、DBP113cm3/100g)
ワックス:日本精蝋(株)製のオゾエース0355
老化防止剤:大内新興化学工業(株)製のノクラック6C(N−(1,3−ジメチルブチル)−N’−フェニル−p−フェニレンジアミン)
ステアリン酸:日油(株)製のステアリン酸
酸化亜鉛:三井金属鉱業(株)製の酸化亜鉛2種
オイル:ジャパンエナジー社製のTDAEオイル
硫黄:鶴見化学工業(株)製の粉末硫黄
加硫促進剤:大内新興化学工業(株)製のノクセラーNS(N−tert−ブチル−2−ベンゾチアジルスルフェンアミド)
表1に示す配合処方に従い、(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薬品を150℃の条件下で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℃の条件下で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150℃で35分間プレス加硫し、加硫ゴムシートを得た。
LAT試験機(Laboratery Abration an Skid Tester、(株)平泉洋行社製のゴム摩耗試験機「LAT100」)を用い、荷重40N、速度20km/h、スリップアングル6°の条件にて、各加硫ゴムシート(加硫後のゴム組成物)の容積損失量を測定した。比較例1の配合ゴムの容積損失量を100とし、下記計算式により、各配合の耐摩耗性能指数を算出した。数値が大きいほど耐摩耗性能に優れることを示す。
(耐摩耗性能指数)=(比較例1の配合の容積損失量)/(各配合の容積損失量)×100
(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℃で各加硫ゴムシート(加硫後のゴム組成物)のtanδを測定した。tanδの逆数の値について比較例2を100として指数表示した(発熱指数)。数値が大きいほど、発熱が小さく、低発熱性に優れることを示している。
各試験用タイヤをリム組みして装着した2D車を用いて、アスファルト路面の一般道を合計10000km走行した後、前輪2輪のタイヤの各4本ずつある各主溝における溝深さを測定し、平均化した。比較例1を100とする指数で表示し、数値が大きいほど、実車での耐摩耗性能が良好である。
2 トレッド部
3 主溝
4 クラウン主溝
5 ショルダー主溝
7 ミドル陸部
7e ミドル陸部の踏面
8 クラウン陸部
9 ショルダー陸部
30 ミドル横溝
30a ミドル横溝の第1部
30b ミドル横溝の第2部
30c ミドル横溝の第3部
30e ミドル横溝の溝縁
31 クラウン横溝
Te トレッド端
TW トレッド幅
Claims (4)
- トレッド部が、イソプレン系ゴム、ブタジエン系ゴム、スチレンブタジエン系ゴム、並びに、平均粒子径20nm以下及び/又は臭化セチルトリメチルアンモニウム吸着比表面積130m2/g以上のカーボンブラックを含むゴム組成物で構成され、かつランド比が81%以上である重荷重用空気入りタイヤ。
- 前記ゴム組成物は、更に平均粒子径20nm超25nm以下及び/又は臭化セチルトリメチルアンモニウム吸着比表面積100m2/g以上130m2/g未満のカーボンブラックを含む請求項1記載の重荷重用空気入りタイヤ。
- 前記ゴム組成物は、ゴム成分100質量%中の総スチレン量が2.0〜11.0質量%である請求項1又は2記載の重荷重用空気入りタイヤ。
- 前記ゴム組成物は、耐摩耗性能指数が140以上である請求項1〜3のいずれかに記載の重荷重用空気入りタイヤ。
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