JP2012062437A - Rubber composition and pneumatic tire - Google Patents
Rubber composition and pneumatic tire Download PDFInfo
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- JP2012062437A JP2012062437A JP2010209488A JP2010209488A JP2012062437A JP 2012062437 A JP2012062437 A JP 2012062437A JP 2010209488 A JP2010209488 A JP 2010209488A JP 2010209488 A JP2010209488 A JP 2010209488A JP 2012062437 A JP2012062437 A JP 2012062437A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 66
- 239000005060 rubber Substances 0.000 title claims abstract description 66
- 239000000203 mixture Substances 0.000 title claims abstract description 61
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 109
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 53
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 19
- -1 amine compound Chemical class 0.000 claims abstract description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
- 239000011593 sulfur Substances 0.000 claims abstract description 17
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 229920003244 diene elastomer Polymers 0.000 claims description 14
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 12
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 5
- LRFVTYWOQMYALW-UHFFFAOYSA-N 9H-xanthine Chemical compound O=C1NC(=O)NC2=C1NC=N2 LRFVTYWOQMYALW-UHFFFAOYSA-N 0.000 abstract description 10
- 230000002787 reinforcement Effects 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 150000001993 dienes Chemical class 0.000 abstract 2
- 238000004073 vulcanization Methods 0.000 description 27
- 238000004132 cross linking Methods 0.000 description 15
- 239000003795 chemical substances by application Substances 0.000 description 11
- RYYVLZVUVIJVGH-UHFFFAOYSA-N caffeine Chemical compound CN1C(=O)N(C)C(=O)C2=C1N=CN2C RYYVLZVUVIJVGH-UHFFFAOYSA-N 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 239000011324 bead Substances 0.000 description 9
- 239000005062 Polybutadiene Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 229920002857 polybutadiene Polymers 0.000 description 7
- 239000004594 Masterbatch (MB) Substances 0.000 description 6
- LPHGQDQBBGAPDZ-UHFFFAOYSA-N Isocaffeine Natural products CN1C(=O)N(C)C(=O)C2=C1N(C)C=N2 LPHGQDQBBGAPDZ-UHFFFAOYSA-N 0.000 description 5
- 229920000459 Nitrile rubber Polymers 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 5
- VJEONQKOZGKCAK-UHFFFAOYSA-N caffeine Natural products CN1C(=O)N(C)C(=O)C2=C1C=CN2C VJEONQKOZGKCAK-UHFFFAOYSA-N 0.000 description 5
- 229960001948 caffeine Drugs 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000002444 silanisation Methods 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 description 3
- 229940075420 xanthine Drugs 0.000 description 3
- 235000014692 zinc oxide Nutrition 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 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 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- OWRCNXZUPFZXOS-UHFFFAOYSA-N 1,3-diphenylguanidine Chemical compound C=1C=CC=CC=1NC(=N)NC1=CC=CC=C1 OWRCNXZUPFZXOS-UHFFFAOYSA-N 0.000 description 1
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-D Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 1
- ROGIWVXWXZRRMZ-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1 ROGIWVXWXZRRMZ-UHFFFAOYSA-N 0.000 description 1
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 description 1
- URDOJQUSEUXVRP-UHFFFAOYSA-N 3-triethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CCO[Si](OCC)(OCC)CCCOC(=O)C(C)=C URDOJQUSEUXVRP-UHFFFAOYSA-N 0.000 description 1
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 description 1
- MFNWUMRYUYUAAV-UHFFFAOYSA-N 4-(3-trimethoxysilylpropyl)-3H-1,3-benzothiazole-2-thione Chemical compound CO[Si](OC)(OC)CCCC1=CC=CC2=C1N=C(S2)S MFNWUMRYUYUAAV-UHFFFAOYSA-N 0.000 description 1
- ZZOXWBGGPBLVNQ-UHFFFAOYSA-N CN(C)C(SSSSC(N(C)C)=[S+]CCC[SiH2]C(OC)OC)=[S+]CCC[SiH2]C(OC)OC Chemical compound CN(C)C(SSSSC(N(C)C)=[S+]CCC[SiH2]C(OC)OC)=[S+]CCC[SiH2]C(OC)OC ZZOXWBGGPBLVNQ-UHFFFAOYSA-N 0.000 description 1
- SKFGZHGVWONCTD-UHFFFAOYSA-N CN(C)C(SSSSC(N(C)C)=[S+]CCC[Si](OC)(OC)OC)=[S+]CCC[Si](OC)(OC)OC Chemical compound CN(C)C(SSSSC(N(C)C)=[S+]CCC[Si](OC)(OC)OC)=[S+]CCC[Si](OC)(OC)OC SKFGZHGVWONCTD-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- MOVRNJGDXREIBM-UHFFFAOYSA-N aid-1 Chemical compound O=C1NC(=O)C(C)=CN1C1OC(COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C(NC(=O)C(C)=C2)=O)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)COP(O)(=O)OC2C(OC(C2)N2C3=C(C(NC(N)=N3)=O)N=C2)CO)C(O)C1 MOVRNJGDXREIBM-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- LASLVGACQUUOEB-UHFFFAOYSA-N bicyclo[1.1.0]butane Chemical compound C1C2CC21 LASLVGACQUUOEB-UHFFFAOYSA-N 0.000 description 1
- GPRLTFBKWDERLU-UHFFFAOYSA-N bicyclo[2.2.2]octane Chemical compound C1CC2CCC1CC2 GPRLTFBKWDERLU-UHFFFAOYSA-N 0.000 description 1
- 150000001602 bicycloalkyls Chemical group 0.000 description 1
- 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 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000001995 cyclobutyl group Chemical group [H]C1([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 229940083747 low-ceiling diuretics xanthine derivative Drugs 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- FBBATURSCRIBHN-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyldisulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSCCC[Si](OCC)(OCC)OCC FBBATURSCRIBHN-UHFFFAOYSA-N 0.000 description 1
- QLNOVKKVHFRGMA-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical group [CH2]CC[Si](OC)(OC)OC QLNOVKKVHFRGMA-UHFFFAOYSA-N 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
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明はゴム組成物および空気入りタイヤに関する。 The present invention relates to a rubber composition and a pneumatic tire.
タイヤのウェット性能を向上させ、転がり抵抗を低減させる手法としてシリカを配合したゴム組成物を用いることが知られており、更なる性能向上の観点から、シリカとともにシランカップリング剤を併用したゴム組成物も知られている。
そして、シリカを配合した組成物にシランカップリング剤を配合する場合、シリカとシランカップリング剤とのカップリング反応（シラニゼーション）が不十分であるとシリカの良好な分散性は得られず、カップリング反応が過剰であるとゴム焼けを招いて品質（特に、補強性）が低下するという問題があった。
It is known to use a rubber composition containing silica as a technique for improving the wet performance of a tire and reducing rolling resistance. From the viewpoint of further improving the performance, a rubber composition using a silane coupling agent together with silica. Things are also known.
And when mix | blending a silane coupling agent with the composition which mix | blended the silica, when the coupling reaction (silanization) of a silica and a silane coupling agent is inadequate, the favorable dispersibility of a silica is not obtained. When the coupling reaction is excessive, there is a problem in that the quality of the rubber (especially reinforcing property) is deteriorated due to rubber burning.
このような問題等に対して、本出願人は、特許文献１〜３において、シリカの分散性が改善されたゴム組成物を提案している。 In order to solve such a problem, the present applicant has proposed a rubber composition having improved silica dispersibility in Patent Documents 1 to 3.
本発明は、特許文献１〜３に記載された発明と同様、シリカの分散性が改善され、補強性が向上した、ウェット性能および転がり抵抗に優れるタイヤを作製することができるタイヤ用のゴム組成物を提供することを目的とする。 The present invention, like the inventions described in Patent Documents 1 to 3, can improve the dispersibility of silica, improve the reinforcing property, and produce a tire excellent in wet performance and rolling resistance. The purpose is to provide goods.
本発明者は、シリカの分散性が向上することで、ゴムの破断強度が増加し、ウェット性能が改善される点に着目し、上記課題を解決すべく鋭意検討を重ねた結果、キサンチン、キサンチン誘導体およびこれらの塩からなる群から選ばれる少なくとも１種を配合したゴム組成物を用いることにより、シリカの分散性が改善され、補強性が向上した、ウェット性能および転がり抵抗に優れるタイヤを作製することができることを見出し、本発明を完成させた。
すなわち、本発明は、以下の（１）〜（５）を提供する。
The present inventor has paid attention to the fact that the dispersibility of silica is improved to increase the breaking strength of rubber and improve the wet performance, and as a result of intensive studies to solve the above problems, xanthine, xanthine By using a rubber composition containing at least one selected from the group consisting of derivatives and salts thereof, a tire having improved wet performance and rolling resistance with improved silica dispersibility and improved reinforcing properties is produced. The present invention has been completed.
That is, the present invention provides the following (1) to (5).
（１）ジエン系ゴム、シリカ、硫黄含有シランカップリング剤およびアミン化合物を含有し、
上記シリカの含有量が、上記ジエン系ゴム１００質量部に対して２０〜１２０質量部であり、
上記硫黄含有シランカップリング剤の含有量が、上記シリカ１００質量部に対して３〜１５質量部であり、
上記アミン化合物の含有量が、上記シリカ１００質量部に対して０．５〜１０質量部であり、
上記アミン化合物が、下記式（Ｉ）で表される化合物およびその塩からなる群から選ばれる少なくとも１種であるゴム組成物。
The silica content is 20 to 120 parts by mass with respect to 100 parts by mass of the diene rubber,
The content of the sulfur-containing silane coupling agent is 3 to 15 parts by mass with respect to 100 parts by mass of the silica,
The content of the amine compound is 0.5 to 10 parts by mass with respect to 100 parts by mass of the silica.
A rubber composition in which the amine compound is at least one selected from the group consisting of a compound represented by the following formula (I) and a salt thereof.
（２）上記式（Ｉ）中、Ｒ１〜Ｒ３が、それぞれ独立に、水素原子またはメチル基である、上記（１）に記載のゴム組成物。 (2) The rubber composition according to the above (1), wherein R 1 to R 3 in the formula (I) are each independently a hydrogen atom or a methyl group.
（３）上記式（Ｉ）で表される化合物が、下記式（１）〜（４）のいずれかで表される化合物である、上記（１）に記載のゴム組成物。
（４）上記（１）〜（３）のいずれかに記載のゴム組成物を用いた空気入りタイヤ。 (4) A pneumatic tire using the rubber composition according to any one of (1) to (3) above.
（５）上記（１）〜（３）のいずれかに記載のゴム組成物をタイヤのトレッドゴムに用いた空気入りタイヤ。 (5) A pneumatic tire using the rubber composition according to any one of (1) to (3) as a tread rubber of a tire.
本発明によれば、シリカの分散性が改善され、補強性が向上した、ウェット性能および転がり抵抗に優れるタイヤを作製することができるタイヤ用のゴム組成物を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the rubber composition for tires which can produce the tire which was excellent in the wet performance and rolling resistance with which the dispersibility of the silica was improved and the reinforcement property improved can be provided.
１．ゴム組成物
本発明のタイヤ用ゴム組成物（以下、単に「本発明のゴム組成物」ともいう。）は、ジエン系ゴム、シリカ、硫黄含有シランカップリング剤およびアミン化合物を含有し、前記シリカの含有量が、前記ジエン系ゴム１００質量部に対して２０〜１２０質量部であり、前記硫黄含有シランカップリング剤の含有量が、前記シリカ１００質量部に対して３〜１５質量部であり、前記アミン化合物の含有量が、前記シリカ１００質量部に対して０．５〜１０質量部であり、前記アミン化合物が、キサンチン、キサンチン誘導体およびこれらの塩からなる群から選ばれる少なくとも１種であるゴム組成物である。
以下に、本発明のゴム組成物が含有する各成分について詳細に説明する。
1. Rubber composition The rubber composition for tires of the present invention (hereinafter also simply referred to as “the rubber composition of the present invention”) contains a diene rubber, silica, a sulfur-containing silane coupling agent and an amine compound, and the silica The content of is 20 to 120 parts by mass with respect to 100 parts by mass of the diene rubber, and the content of the sulfur-containing silane coupling agent is 3 to 15 parts by mass with respect to 100 parts by mass of the silica. The content of the amine compound is 0.5 to 10 parts by mass with respect to 100 parts by mass of the silica, and the amine compound is at least one selected from the group consisting of xanthine, xanthine derivatives, and salts thereof. It is a certain rubber composition.
Below, each component which the rubber composition of this invention contains is demonstrated in detail.
（１）ジエン系ゴム
本発明のゴム組成物に含有するジエン系ゴムは、主鎖に二重結合を有するものであれば特に限定されず、その具体例としては、天然ゴム（ＮＲ）、イソプレンゴム（ＩＲ）、スチレン−ブタジエンゴム（ＳＢＲ）、ブタジエンゴム（ＢＲ）、クロロプレンゴム（ＣＲ）、アクリロニトリルブタジエンゴム（ＮＢＲ）、エチレン−プロピレン−ジエン共重合体ゴム（ＥＰＤＭ）、スチレン−イソプレンゴム、イソプレン−ブタジエンゴム、ニトリルゴム、水添ニトリルゴム等が挙げられ、これらを１種単独で用いてもよく、２種以上を併用してもよい。
(1) Diene rubber The diene rubber contained in the rubber composition of the present invention is not particularly limited as long as it has a double bond in the main chain. Specific examples thereof include natural rubber (NR) and isoprene. Rubber (IR), styrene-butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), ethylene-propylene-diene copolymer rubber (EPDM), styrene-isoprene rubber, Isoprene-butadiene rubber, nitrile rubber, hydrogenated nitrile rubber and the like may be mentioned, and these may be used alone or in combination of two or more.
これらのうち、ウェット性能と補強性能とのバランスが取れるという理由から、スチレン−ブタジエンゴム（ＳＢＲ）、ブタジエンゴム（ＢＲ）を用いるのが好ましく、これらを併用するのがより好ましい。 Of these, styrene-butadiene rubber (SBR) and butadiene rubber (BR) are preferably used, and more preferably used in combination, because the balance between wet performance and reinforcing performance can be achieved.
（２）シリカ
本発明のゴム組成物に含有するシリカは特に限定されず、タイヤ等の用途でゴム組成物に配合されている従来公知の任意のシリカを用いることができる。
(2) Silica The silica contained in the rubber composition of the present invention is not particularly limited, and any conventionally known silica compounded in the rubber composition for uses such as tires can be used.
上記シリカとしては、具体的には、例えば、ヒュームドシリカ、焼成シリカ、沈降シリカ、粉砕シリカ、溶融シリカ、コロイダルシリカ等が挙げられ、これらを１種単独で用いてもよく、２種以上を併用してもよい。 Specific examples of the silica include fumed silica, calcined silica, precipitated silica, pulverized silica, fused silica, colloidal silica, and the like. These may be used alone or in combination of two or more. You may use together.
本発明においては、上記シリカの含有量は、上記ジエン系ゴム１００質量部に対してシリカを２０〜１２０質量部であり、得られるタイヤの耐摩耗性が良好となり、強度も向上する理由から、４０〜１００質量部であるのがより好ましい。 In the present invention, the content of the silica is 20 to 120 parts by mass of silica with respect to 100 parts by mass of the diene rubber, and the resulting tire has good wear resistance and improved strength. More preferably, it is 40-100 mass parts.
（３）硫黄含有シランカップリング剤
本発明のゴム組成物に含有する硫黄含有シランカップリング剤は特に限定されず、タイヤ等の用途でゴム組成物に配合されている従来公知の任意のシランカップリング剤を用いることができる。
(3) Sulfur-containing silane coupling agent The sulfur-containing silane coupling agent contained in the rubber composition of the present invention is not particularly limited, and any conventionally known silane cup compounded in a rubber composition for use such as tires. A ring agent can be used.
上記シランカップリング剤としては、具体的には、例えば、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、トリメトキシシリルプロピル−メルカプトベンゾチアゾールテトラスルフィド、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、ジメトキシメチルシリルプロピル−Ｎ，Ｎ−ジメチルチオカルバモイル−テトラスルフィド、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−［３−（トリメトキシシリル）−プロピル］テトラスルフィド、ビス−［３−（トリエトキシシリル）−プロピル］ジスルフィド、３−メルカプトプロピル−トリメトキシシラン、３−メルカプトプロピル−トリエトキシシラン等が挙げられ、これらを１種単独で用いてもよく、２種以上を併用してもよい。 Specific examples of the silane coupling agent include 3-trimethoxysilylpropyl-N, N-dimethylthiocarbamoyl-tetrasulfide, trimethoxysilylpropyl-mercaptobenzothiazole tetrasulfide, and triethoxysilylpropyl-methacrylate. Monosulfide, dimethoxymethylsilylpropyl-N, N-dimethylthiocarbamoyl-tetrasulfide, bis- [3- (triethoxysilyl) -propyl] tetrasulfide, bis- [3- (trimethoxysilyl) -propyl] tetra Examples include sulfide, bis- [3- (triethoxysilyl) -propyl] disulfide, 3-mercaptopropyl-trimethoxysilane, 3-mercaptopropyl-triethoxysilane, and the like. Well, it may be used in combination of two or more thereof.
本発明においては、上記硫黄含有シランカップリング剤の含有量は、上記シリカ１００質量部に対して３〜１５質量部であり、本発明のゴム組成物の加硫後の引張強さ、切断時伸び等の物性が向上する理由から、５〜１０質量部であるのがより好ましい。 In the present invention, the content of the sulfur-containing silane coupling agent is 3 to 15 parts by mass with respect to 100 parts by mass of the silica, and the tensile strength after vulcanization of the rubber composition of the present invention at the time of cutting. It is more preferably 5 to 10 parts by mass because the physical properties such as elongation are improved.
（４）アミン化合物
本発明のゴム組成物に含有するアミン化合物は、上述したシリカとシランカップリング剤とのカップリング反応（シラニゼーション）を促進させる観点から添加する添加剤であり、下記式（Ｉ）で表される化合物である。
(4) Amine compound The amine compound contained in the rubber composition of the present invention is an additive added from the viewpoint of promoting the coupling reaction (silanization) between the silica and the silane coupling agent described above. It is a compound represented by (I).
Ｒ１〜Ｒ３のうち２つ以上にアルキル基が選択される場合には、それらは独立に選択される。すなわち、互いに相違するアルキル基を選択してもよいし、同一のアルキル基を選択してもよいし、３つのうち２つが同一で、他の１つがそれらと相違するアルキル基であってもよい。 When alkyl groups are selected for two or more of R 1 to R 3 , they are independently selected. That is, different alkyl groups may be selected, the same alkyl group may be selected, or two of the three may be the same and the other one may be a different alkyl group. .
ここで、上記アルキル基としては、特に限定されず、例えば、Ｃ１−８鎖式アルキル基、Ｃ３−１０脂環式アルキル基等が挙げられる。 Here, the alkyl group is not particularly limited, and examples thereof include a C 1-8 chain alkyl group and a C 3-10 alicyclic alkyl group.
上記Ｃ１−８鎖式アルキル基としては、具体的には、例えば、メチル基、エチル基、プロピル基、イソプロピル基、ｎ−ブチル基、イソブチル基、ｓｅｃ-ブチル基、ｔｅｒｔ−ブチル基、ｎ−プロピル基、イソプロピル基、ネオプロピル基、ｔｅｒｔ−プロピル基等が挙げられる。これらのうちでは、メチル基、エチル基またはプロピル基が好ましく、メチル基またはエチル基がより好ましく、メチル基がさらに好ましい。 Specific examples of the C 1-8 chain alkyl group include, for example, methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n -Propyl group, isopropyl group, neopropyl group, tert-propyl group and the like. Among these, a methyl group, an ethyl group or a propyl group is preferable, a methyl group or an ethyl group is more preferable, and a methyl group is more preferable.
上記脂環式アルキル基としては、具体的には、例えば、シクロプロピル基、シクロブチル基、シクロペンチル基、シクロヘキシル基等が挙げられる。また、例えば、ビシクロ［１，１，０］ブタン、ビシクロ［２，２，２］オクタンその他のＣ４−１０ビシクロアルカンから誘導されたビシクロアルキル基であってもよい。 Specific examples of the alicyclic alkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group. Further, for example, it may be a bicycloalkyl group derived from bicyclo [1,1,0] butane, bicyclo [2,2,2] octane or other C 4-10 bicycloalkane.
上記式（Ｉ）で表される化合物としては、下記式（１）〜（４）のいずれかで表される化合物が、シラニゼーション促進効果が大きいという理由から好適に例示される。すなわち、本発明の組成物に含有するアミン化合物として、下記式（１）〜（４）のいずれかで表される化合物からなる群から選ばれる少なくとも１つであることが好ましい。 As the compound represented by the above formula (I), a compound represented by any one of the following formulas (1) to (4) is preferably exemplified because of its large silanization promoting effect. That is, the amine compound contained in the composition of the present invention is preferably at least one selected from the group consisting of compounds represented by any of the following formulas (1) to (4).
なお、これらは、いずれも、天然物由来のアミン化合物であるため、石油系合成化合物に比べ、環境負荷の軽減に大きく貢献し得るという利点も有する。 In addition, since these are all amine compounds derived from natural products, they also have an advantage that they can greatly contribute to the reduction of environmental burden compared to petroleum-based synthetic compounds.
また、本発明においては、上記アミン化合物の含有量は、上記シリカ１００質量部に対して０．５〜１０質量部であり、得られる本発明のゴム組成物のシリカの高い分散性とモジュラス特性を良好に保つことができる理由から、２．０〜１０質量部であるのがより好ましい。 Moreover, in this invention, content of the said amine compound is 0.5-10 mass parts with respect to 100 mass parts of said silica, The high dispersibility and modulus characteristic of the silica of the rubber composition of this invention obtained are obtained. Is more preferably 2.0 to 10 parts by mass from the reason that can be kept good.
（５）上記以外の成分
本発明のゴム組成物には、上記成分の他に、シリカ以外のフィラー（例えば、カーボンブラック等）、加硫または架橋剤、加硫または架橋促進剤、酸化亜鉛、オイル、老化防止剤、可塑剤等のタイヤ用ゴム組成物に一般的に用いられている各種のその他の添加剤を配合することができる。これらの添加剤の配合量は本発明の目的に反しない限り、従来の一般的な配合量とすることができる。
(5) Components other than the above In addition to the above components, the rubber composition of the present invention includes a filler other than silica (for example, carbon black), a vulcanization or crosslinking agent, a vulcanization or crosslinking accelerator, zinc oxide, Various other additives generally used in tire rubber compositions such as oils, antioxidants, and plasticizers can be blended. As long as the amount of these additives is not contrary to the object of the present invention, a conventional general amount can be used.
２．ゴム組成物の製造方法
本発明のゴム組成物は、上記した成分を混合・混錬することによって製造することができるが、上記した成分のうち、加硫（架橋）剤および加硫（架橋）促進剤以外の成分を混合および混練してマスターバッチを作成し、このマスターバッチに加硫（架橋）剤および加硫（架橋）促進剤を混合し、オープンロール等を用いて混練してゴム組成物を製造することが好ましい。このように、加硫（架橋）剤および加硫（架橋）促進剤以外の成分からなるマスターバッチを作成し、そのマスターバッチに加硫（架橋）剤および加硫（架橋）促進剤を混合・混練すると、加硫（架橋）剤および加硫（架橋）促進剤を混合してからの混練時間を短くすることができ、不均一な加硫（架橋）が生じることによる加硫（架橋）ゴム組成物の物性低下を防止することができるうえ、加硫（架橋）の制御が容易となる。
2. Method for Producing Rubber Composition The rubber composition of the present invention can be produced by mixing and kneading the above components. Among the above components, a vulcanization (crosslinking) agent and a vulcanization (crosslinking). Mixing and kneading ingredients other than accelerators to create a master batch, mixing this master batch with a vulcanization (crosslinking) agent and a vulcanization (crosslinking) accelerator, kneading using an open roll, etc., and rubber composition It is preferable to produce a product. In this way, a masterbatch composed of components other than the vulcanization (crosslinking) agent and the vulcanization (crosslinking) accelerator is prepared, and the vulcanization (crosslinking) agent and the vulcanization (crosslinking) accelerator are mixed into the masterbatch. When kneaded, the vulcanization (crosslinking) rubber and the vulcanization (crosslinking) accelerator can be mixed to shorten the kneading time, resulting in non-uniform vulcanization (crosslinking). The physical properties of the composition can be prevented from being lowered, and vulcanization (crosslinking) can be easily controlled.
３．空気入りタイヤ
本発明の空気入りタイヤ（以下、単に「本発明タイヤ」ともいう。）は、上述した本発明のゴム組成物を用いた空気入りタイヤである。
図１に、本発明のタイヤの実施態様の一例を表すタイヤの部分断面概略図を示すが、本発明のタイヤは図１に示す態様に限定されるものではない。
3. Pneumatic tire The pneumatic tire of the present invention (hereinafter also simply referred to as “the tire of the present invention”) is a pneumatic tire using the above-described rubber composition of the present invention.
FIG. 1 shows a schematic partial sectional view of a tire representing an example of an embodiment of the tire of the present invention, but the tire of the present invention is not limited to the embodiment shown in FIG.
図１において、符号１はビード部を表し、符号２はサイドウォール部を表し、符号３はタイヤトレッド部を表す。
また、左右一対のビード部１間においては、繊維コードが埋設されたカーカス層４が装架されており、このカーカス層４の端部はビードコア５およびビードフィラー６の廻りにタイヤ内側から外側に折り返されて巻き上げられている。
また、タイヤトレッド３においては、カーカス層４の外側に、ベルト層７がタイヤ１周に亘って配置されている。
また、ビード部１においては、リムに接する部分にリムクッション８が配置されている。
In FIG. 1, reference numeral 1 represents a bead portion, reference numeral 2 represents a sidewall portion, and reference numeral 3 represents a tire tread portion.
Further, a carcass layer 4 in which fiber cords are embedded is mounted between the pair of left and right bead portions 1, and the end of the carcass layer 4 extends from the inside of the tire to the outside around the bead core 5 and the bead filler 6. Wrapped and rolled up.
In the tire tread 3, a belt layer 7 is disposed over the circumference of the tire on the outside of the carcass layer 4.
Moreover, in the bead part 1, the rim cushion 8 is arrange | positioned in the part which touches a rim | limb.
本発明のタイヤは、例えば、本発明のゴム組成物が含有するジエン系ゴム、加硫剤または架橋剤、加硫促進剤または架橋促進剤の種類およびその配合割合に応じた温度で加硫または架橋し、トレッド部やサイドウォール部等を形成することにより製造することができる。 The tire of the present invention is vulcanized or cured at a temperature corresponding to, for example, the diene rubber, vulcanizing agent or crosslinking agent, vulcanization accelerator or crosslinking accelerator contained in the rubber composition of the present invention and the blending ratio thereof. It can manufacture by bridge | crosslinking and forming a tread part, a side wall part, etc.
本発明においては、シリカの分散性が向上し、補強性の低下が抑制され、ウェット性能および転がり抵抗に優れるという本発明の効果を活かす観点から、他の部材よりもシリカの配合量が多いタイヤトレッド部を本発明のゴム組成物で形成することが好ましい。 In the present invention, from the viewpoint of utilizing the effects of the present invention in which the dispersibility of silica is improved, the decrease in reinforcement is suppressed, and the wet performance and rolling resistance are excellent, the tire has a larger amount of silica than other members. It is preferable to form the tread portion with the rubber composition of the present invention.
以下、実施例によって本発明をさらに具体的に説明するが、本発明の範囲をこれらの実施例に限定するものではない。 EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the scope of the present invention is not limited to these examples.
１．ゴム組成物
標準例１、実施例１〜６ならびに比較例１および２に係る各ゴム組成物の配合を第１表の「ゴム組成物」の欄に示す（単位は質量部）。第１表の「ゴム組成物」の欄に示す配合において、加硫促進剤および加硫剤を除く各成分を、１．５リットルの密閉型ミキサーで９分間混練し、１５０℃に達したときに放出してマスターバッチを得た。このマスターバッチに加硫促進剤および加硫剤をオープンロールで混練し、ゴム組成物を得た。
1. Rubber composition The composition of each rubber composition according to Standard Example 1, Examples 1 to 6 and Comparative Examples 1 and 2 is shown in the column of "Rubber Composition" in Table 1 (the unit is parts by mass). In the composition shown in the column of “Rubber composition” in Table 1, each component except the vulcanization accelerator and the vulcanizing agent is kneaded for 9 minutes with a 1.5 liter closed mixer and reaches 150 ° C. To obtain a master batch. A vulcanization accelerator and a vulcanizing agent were kneaded with this master batch with an open roll to obtain a rubber composition.
２．物性評価
（１）Ｍ３００／Ｍ１００（補強性の指標）
得られたゴム組成物を、１５０×１５０×２ｍｍの金型を用いて１６０℃で２０分間プレス加硫し、厚さ２ｍｍの加硫ゴムシートを成形した。
この加硫ゴムシートから３号ダンベル状の試験片を打ち抜き、ＪＩＳ Ｋ ６２５１：２００４に準拠して１００％モジュラス（Ｍ１００）および３００％モジュラス（Ｍ３００）を測定し、Ｍ３００／Ｍ１００の値を求めた。標準例１の値を基準（１００％）として、実施例１〜６ならびに比較例１および２のＭ３００／Ｍ１００の値を百分率（％）で表した。これを補強性の指標とした。
数値を第１表のＭ３００／Ｍ１００の欄に示した。数値は大きいほど良い。
2. Physical property evaluation (1) M300 / M100 (index of reinforcement)
The obtained rubber composition was press vulcanized at 160 ° C. for 20 minutes using a 150 × 150 × 2 mm mold to form a vulcanized rubber sheet having a thickness of 2 mm.
A No. 3 dumbbell-shaped test piece was punched from this vulcanized rubber sheet, 100% modulus (M100) and 300% modulus (M300) were measured according to JIS K 6251: 2004, and a value of M300 / M100 was obtained. . The value of M300 / M100 of Examples 1 to 6 and Comparative Examples 1 and 2 was expressed as a percentage (%) with the value of Standard Example 1 as a reference (100%). This was used as an index of reinforcement.
Numerical values are shown in the column of M300 / M100 in Table 1. Larger numbers are better.
（２）ＴＢ（シリカの補強性の指標）
３号ダンベル状の試験片を作成し、ＪＩＳ Ｋ ６２５１：２００４に準拠してＴＢ（引張強さ）を測定した（単位：ＭＰａ）。標準例１の測定値を基準（１００％）として、実施例１〜６ならびに比較例１および２の測定値を百分率（％）で表した。
数値を第１表のＴＢの欄に示した。数値は大きいほどよい。
(2) TB (indicator of silica reinforcement)
A No. 3 dumbbell-shaped test piece was prepared, and TB (tensile strength) was measured according to JIS K 6251: 2004 (unit: MPa). The measured values of Examples 1 to 6 and Comparative Examples 1 and 2 were expressed as percentages (%) with the measured value of Standard Example 1 as a reference (100%).
Numerical values are shown in the TB column of Table 1. Larger numbers are better.
（３）ＥＢ（シリカの補強性の指標）
３号ダンベル状の試験片を作成し、ＪＩＳ Ｋ ６２５１：２００４に準拠してＥＢ（切断時伸び）を測定した（単位：％）。標準例１の測定値を基準（１００％）として、実施例１〜６ならびに比較例１および２の測定値を百分率（％）で表した。
数値を第１表のＥＢの欄に示した。数値は大きいほどよい。
(3) EB (indicator of silica reinforcement)
A No. 3 dumbbell-shaped test piece was prepared, and EB (elongation at break) was measured in accordance with JIS K 6251: 2004 (unit:%). The measured values of Examples 1 to 6 and Comparative Examples 1 and 2 were expressed as percentages (%) with the measured value of Standard Example 1 as a reference (100%).
Numerical values are shown in the EB column of Table 1. Larger numbers are better.
（４）ΔＧ´（シリカの分散性の指標）
未加硫ゴムを用いて１６０℃で２０分間の加硫を行い、歪率０．２８％〜３０．０％までの歪せん断応力Ｇ´を測定した（単位：ＭＰａ）。測定には、粘弾性測定装置ＲＰＡ２０００（アルファテクノロジーズ社製）を使用した。歪率０．２８％時のＧ´（Ｇ´０．２８）と歪３０．０％時のＧ´（Ｇ´３０．０）との差ΔＧ´＝（Ｇ´０．２８−Ｇ´３０．０）を計算し、標準例１の測定値を基準（１００％）として、実施例１〜６ならびに比較例１および２の測定値を百分率（％）で表した。
数値を第１表のΔＧ´の欄に示した。数値が小さいほどシリカ分散性が良好である。
(4) ΔG ′ (indicator of dispersibility of silica)
Vulcanization was carried out at 160 ° C. for 20 minutes using unvulcanized rubber, and strain shear stress G ′ having a strain rate of 0.28% to 30.0% was measured (unit: MPa). For the measurement, a viscoelasticity measuring device RPA2000 (manufactured by Alpha Technologies) was used. The difference ΔG ′ = (G ′ 0.28 −G ′ 30 ) between G ′ (G ′ 0.28 ) when the strain rate is 0.28% and G ′ (G ′ 30.0 ) when the strain is 30.0%. 0.0 ), and the measured values of Examples 1 to 6 and Comparative Examples 1 and 2 were expressed in percentage (%) with the measured value of Standard Example 1 as a reference (100%).
Numerical values are shown in the column of ΔG ′ in Table 1. The smaller the value, the better the silica dispersibility.
第１表のゴム組成物の欄に示す各成分は以下の通りである。なお、第１表において、ゴム組成物の各成分の配合量は、（Ｂ）シリカ、（Ｅ）加硫剤、（Ｆ）加硫促進剤、（Ｇ）加硫促進助剤および（Ｈ）その他の配合剤については、（Ａ）ジエン系ゴムの合計を１００質量部としたときの相対値（質量部）で、（Ｃ）硫黄含有シランカップリング剤および（Ｄ）アミン化合物については、（Ｂ）シリカを１００質量部としたときの相対値（質量部）で、それぞれ表示している。
（Ａ）ジエン系ゴム
ジエン系ゴム１：ＶＳＬ−５０２５ ＨＭ−１（スチレン−ブタジエンゴム（ＳＢＲ）；ＬＡＮＸＣＥＳＳ社製；油展，第１表では油分を除いたゴム分を表示している）
ジエン系ゴム２：Ｎｉｐｏｌ １２２０（ブタジエンゴム（ＢＲ）；日本ゼオン社製）
（Ｂ）シリカ
シリカ１：Ｚｅｏｓｉｌ １１６５ＭＰ（シリカ；Ｒｈｏｄｉａ社製）
（Ｃ）硫黄含有シランカップリング剤
シランカップリング剤１：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；Ｄｅｇｕｓｓａ社製）
（Ｄ）アミン化合物
アミン化合物１：Ｃａｆｆｅｉｎｅ（カフェイン；東京化成工業社製）
イオウ１：油処理硫黄（イオウ；細井化学工業社製；油分５．１質量％，第１表では油分を除いたイオウ分を表示している）
（Ｆ）加硫促進剤
加硫促進剤１：サントキュアＣＢＳ（Ｎ−シクロヘキシル−２−ベンゾチアゾール；ＦＬＥＸＳＹＳ社製）
加硫促進剤２：パーカシットＤＰＧ（Ｎ，Ｎ´−ジフェニルグアニジン；ＦＬＥＸＳＹＳ社製）
（Ｇ）加硫促進助剤
加硫促進助剤１：亜鉛華３種（酸化亜鉛；正同化学社製）
加硫促進助剤２：ビーズステアリン酸ＹＲ（ステアリン酸；日油社製）
（Ｈ）その他の配合剤
オイル１：プロセスＸ−１４０（プロセスオイル；ジャパンエナジー社製）
Each component shown in the column of the rubber composition in Table 1 is as follows. In Table 1, the blending amount of each component of the rubber composition is (B) silica, (E) vulcanizing agent, (F) vulcanization accelerator, (G) vulcanization acceleration aid, and (H). About other compounding agents, (A) Relative value (part by mass) when the total of diene rubber is 100 parts by mass, (C) about sulfur-containing silane coupling agent and (D) amine compound, B) Relative values (parts by mass) when silica is 100 parts by mass are shown.
(A) Diene rubber Diene rubber 1: VSL-5025 HM-1 (styrene-butadiene rubber (SBR); manufactured by LANXCESS; oil exhibition, Table 1 shows rubber content excluding oil)
Diene rubber 2: Nipol 1220 (Butadiene rubber (BR); manufactured by Nippon Zeon)
(B) Silica Silica 1: Zeosil 1165MP (silica; manufactured by Rhodia)
(C) Sulfur-containing silane coupling agent Silane coupling agent 1: Si69 (bis [3- (triethoxysilyl) propyl] tetrasulfide; manufactured by Degussa)
(D) Amine compound Amine compound 1: Caffeine (caffeine; manufactured by Tokyo Chemical Industry Co., Ltd.)
Sulfur 1: Oil-treated sulfur (sulfur; manufactured by Hosoi Chemical Co., Ltd .; 5.1% oil content, Table 1 shows sulfur content excluding oil)
(F) Vulcanization accelerator Vulcanization accelerator 1: Suntocure CBS (N-cyclohexyl-2-benzothiazole; manufactured by FLEXSYS)
Vulcanization accelerator 2: Parkasit DPG (N, N'-diphenylguanidine; manufactured by FLEXSYS)
(G) Vulcanization acceleration aid Vulcanization acceleration aid 1: 3 types of zinc white (Zinc oxide; manufactured by Shodo Chemical Co., Ltd.)
Vulcanization acceleration aid 2: beads stearic acid YR (stearic acid; manufactured by NOF Corporation)
(H) Other compounding agents Oil 1: Process X-140 (Process oil; manufactured by Japan Energy)
３．物性評価の結果の説明
上記第１表に示す結果から、カフェイン（下記式（１）で表される化合物）を所定量配合して調製した実施例１〜６のゴム組成物は、これを配合せずに調製した標準例１のゴム組成物と比較して、シリカの分散性（ΔＧ´）が改善され、補強性（ＴＢ、ＥＢ）が向上し、ウェット性能および転がり抵抗に優れるタイヤを作製することができることが分かった。
3. Description of results of physical property evaluation From the results shown in Table 1 above, the rubber compositions of Examples 1 to 6 prepared by blending a predetermined amount of caffeine (compound represented by the following formula (1)) Compared with the rubber composition of Standard Example 1 prepared without blending, a tire having improved silica dispersibility (ΔG ′), improved reinforcing properties (TB, EB), and excellent wet performance and rolling resistance. It was found that it can be produced.
一方、カフェインを少量配合して調製した比較例１のゴム組成物は、標準例１のゴム組成物と比較した改善効果がほとんどなく、カフェインを多量配合して調製した比較例２のゴム組成物は、標準例１のゴム組成物と比べると、シリカの分散性（ΔＧ´）が向上するものの、補強性（ＴＢ、ＥＢ）が低下することがわかった。 On the other hand, the rubber composition of Comparative Example 1 prepared by blending a small amount of caffeine has little improvement effect compared to the rubber composition of Standard Example 1, and the rubber of Comparative Example 2 prepared by blending a large amount of caffeine. The composition was found to have improved silica dispersibility (ΔG ′) but lower reinforcement (TB, EB) than the rubber composition of Standard Example 1.
１ ビード部
２ サイドウォール部
３ タイヤトレッド部
４ カーカス層
５ ビードコア
６ ビードフィラー
７ ベルト層
８ リムクッション
1 Bead part 2 Side wall part 3 Tire tread part 4 Carcass layer 5 Bead core 6 Bead filler 7 Belt layer 8 Rim cushion
Claims (5)
前記シリカの含有量が、前記ジエン系ゴム１００質量部に対して２０〜１２０質量部であり、
前記硫黄含有シランカップリング剤の含有量が、前記シリカ１００質量部に対して３〜１５質量部であり、
前記アミン化合物の含有量が、前記シリカ１００質量部に対して０．５〜１０質量部であり、
前記アミン化合物が、下記式（Ｉ）で表される化合物およびその塩からなる群から選ばれる少なくとも１種であるゴム組成物。
［式中、Ｒ１〜Ｒ３は、それぞれ独立に、水素原子またはアルキル基である。］ Containing a diene rubber, silica, a sulfur-containing silane coupling agent and an amine compound,
The silica content is 20 to 120 parts by mass with respect to 100 parts by mass of the diene rubber,
The content of the sulfur-containing silane coupling agent is 3 to 15 parts by mass with respect to 100 parts by mass of the silica,
The content of the amine compound is 0.5 to 10 parts by mass with respect to 100 parts by mass of the silica,
A rubber composition in which the amine compound is at least one selected from the group consisting of a compound represented by the following formula (I) and a salt thereof.
[Wherein, R 1 to R 3 each independently represents a hydrogen atom or an alkyl group. ]
The rubber composition according to claim 1, wherein the compound represented by the formula (I) is a compound represented by any one of the following formulas (1) to (4).
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| JPWO2019035443A1 (en) * | 2017-08-18 | 2020-04-16 | Jsr株式会社 | Method for producing rubber composition |
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