JP5154071B2 - Rubber composition and tire using the same - Google Patents

Rubber composition and tire using the same Download PDF

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JP5154071B2
JP5154071B2 JP2006324194A JP2006324194A JP5154071B2 JP 5154071 B2 JP5154071 B2 JP 5154071B2 JP 2006324194 A JP2006324194 A JP 2006324194A JP 2006324194 A JP2006324194 A JP 2006324194A JP 5154071 B2 JP5154071 B2 JP 5154071B2
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JP2007197671A (en
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和郎 保地
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住友ゴム工業株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/80Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86Optimisation of rolling resistance, e.g. weight reduction 

Description

本発明は、ゴム組成物およびそれを用いたタイヤに関する。   The present invention relates to a rubber composition and a tire using the rubber composition.
近年、タイヤに要求される特性は、トレッドにおいては、グリップ性能や転がり抵抗特性などを向上させることが必要とされている。グリップ性能および転がり抵抗特性は、いずれもゴムのヒステリシスロスに関する特性である。一般に、ヒステリシスロスを大きくすると、グリップ力は高くなり制動性能が向上するため、グリップ性能に優れるが、転がり抵抗が大きくなるため、転がり抵抗特性の悪化をもたらす。このように、グリップ性能と転がり抵抗特性とは相反する関係にあるため、両特性を同時に満足させるべく、種々のタイヤ用ゴム組成物が提案されている。   In recent years, characteristics required for tires are required to improve grip performance, rolling resistance characteristics, and the like in treads. Both the grip performance and the rolling resistance characteristic are characteristics related to hysteresis loss of rubber. In general, when the hysteresis loss is increased, the gripping force is increased and the braking performance is improved, so that the grip performance is excellent. However, the rolling resistance is increased, so that the rolling resistance characteristic is deteriorated. As described above, since the grip performance and the rolling resistance characteristic are contradictory to each other, various tire rubber compositions have been proposed in order to satisfy both characteristics at the same time.
グリップ性能および転がり抵抗特性をともに向上させるために、補強剤として、グリップ性能と転がり抵抗特性とをバランスよく向上させることのできるシリカを配合したゴム組成物が知られている。しかしながら、その改善効果はグリップ性能および転がり抵抗特性ともに、充分なものではないという問題がある。   In order to improve both grip performance and rolling resistance characteristics, a rubber composition is known that contains silica as a reinforcing agent that can improve the grip performance and rolling resistance characteristics in a well-balanced manner. However, the improvement effect has a problem that neither the grip performance nor the rolling resistance characteristic is sufficient.
転がり抵抗をさらに低減させる方法として、シリカおよびシランカップリング剤を配合する方法も知られている。シランカップリング剤を配合することで、ゴムおよびシリカがシランカップリング剤と化学的に結合することにより、転がり抵抗を低減させることができる。しかし、シリカとシランカップリング剤とを混練りする際に高温で充分反応させる必要があり、シランカップリング剤中のゴムと反応する官能基が混練りなどの加工中に反応を開始し、ゲル化と言われるゴム焼けの現象が起こるという問題がある。   As a method for further reducing rolling resistance, a method of blending silica and a silane coupling agent is also known. By blending the silane coupling agent, the rubber and silica are chemically bonded to the silane coupling agent, whereby the rolling resistance can be reduced. However, when kneading the silica and the silane coupling agent, it is necessary to sufficiently react at high temperature, and the functional group that reacts with the rubber in the silane coupling agent starts the reaction during processing such as kneading, and the gel There is a problem that the phenomenon of rubber burning, which is called chemical conversion, occurs.
特許文献1には、特定の溶液重合スチレンブタジエンゴムを所定含有率含有するゴム成分、シリカおよび所定の芳香族油を所定量含有することで、高温条件下で優れたウェットグリップ性能を示すトレッド用ゴム組成物が開示されているが、転がり抵抗を低減させるものではなかった。   Patent Document 1 includes a rubber component containing a specific content of a specific solution-polymerized styrene-butadiene rubber, silica, and a predetermined amount of a predetermined aromatic oil, thereby providing excellent wet grip performance under high temperature conditions. Although a rubber composition has been disclosed, it did not reduce rolling resistance.
特開2001−172434号公報JP 2001-172434 A
本発明は、ウェットグリップ性能を低下させることなく、転がり抵抗を低減させることのできるゴム組成物およびそれを用いたタイヤを提供することを目的とする。   An object of this invention is to provide the rubber composition which can reduce rolling resistance, and a tire using the same, without reducing wet grip performance.
本発明は、スチレン含有量が33重量%以上、およびビニル含有量が30重量%以上であるスチレンブタジエンゴム(1)を15重量%以上、ならびにスチレン含有量が15重量%以下、およびビニル含有量が60重量%以下であるスチレンブタジエンゴム(2)を10重量%以上含有し、スチレンブタジエンゴム(1)およびスチレンブタジエンゴム(2)の合計含有率が60重量%以上であるゴム成分100重量部に対して、窒素吸着比表面積が20〜500m2/gであるシリカを15〜150重量部含有するゴム組成物に関する。 The present invention provides a styrene butadiene rubber (1) having a styrene content of 33% by weight or more and a vinyl content of 30% by weight or more, a styrene content of 15% by weight or less, and a vinyl content. 100 parts by weight of a rubber component containing 10% by weight or more of styrene butadiene rubber (2) having a weight of 60% by weight or less and a total content of styrene butadiene rubber (1) and styrene butadiene rubber (2) of 60% by weight or more In contrast, the present invention relates to a rubber composition containing 15 to 150 parts by weight of silica having a nitrogen adsorption specific surface area of 20 to 500 m 2 / g.
前記シリカは、水に分散させて5%水性分散液としたときのpHが7〜12であることが好ましい。   The silica preferably has a pH of 7 to 12 when dispersed in water to form a 5% aqueous dispersion.
また、本発明は、前記ゴム組成物を用いたタイヤに関する。   The present invention also relates to a tire using the rubber composition.
本発明によれば、スチレン含有量およびビニル含有量の異なる2種類以上のスチレンブタジエンゴムをそれぞれ所定含有率含有するゴム成分に、所定のシリカを所定量含有することで、ウェットグリップ性能を低下させることなく、転がり抵抗を低減させることのできるゴム組成物およびそれを用いたタイヤを提供することができる。   According to the present invention, wet grip performance is lowered by containing a predetermined amount of silica in a rubber component containing a predetermined content of two or more styrene butadiene rubbers having different styrene contents and vinyl contents. A rubber composition capable of reducing rolling resistance and a tire using the rubber composition can be provided.
本発明のゴム組成物は、ゴム成分およびシリカを含有する。   The rubber composition of the present invention contains a rubber component and silica.
前記ゴム成分は、スチレンブタジエンゴム(1)(SBR(1))およびスチレンブタジエンゴム(2)(SBR(2))を含有する。   The rubber component contains styrene butadiene rubber (1) (SBR (1)) and styrene butadiene rubber (2) (SBR (2)).
SBR(1)のスチレン含有量は33重量%以上、好ましくは35重量%以上である。SBR(1)のスチレン含有量が33重量%未満では、グリップ性能が充分に向上しない。また、SBR(1)のスチレン含有量は50重量%以下が好ましく、38重量%以下がより好ましい。SBR(1)のスチレン含有量が50重量%をこえると、発熱が大きくなる傾向がある。   The styrene content of SBR (1) is 33% by weight or more, preferably 35% by weight or more. When the styrene content of SBR (1) is less than 33% by weight, the grip performance is not sufficiently improved. The styrene content in SBR (1) is preferably 50% by weight or less, and more preferably 38% by weight or less. When the styrene content of SBR (1) exceeds 50% by weight, heat generation tends to increase.
SBR(1)のビニル含有量は30重量%以上、好ましくは32重量%以上である。SBR(1)のビニル含有量が30重量%未満では、グリップ性能が充分に向上しない。また、SBR(1)のビニル含有量は65重量%以下が好ましく、60重量%以下がより好ましい。SBR(1)のビニル含有量が65重量%をこえると、耐摩耗性が低下する傾向がある。   The vinyl content of SBR (1) is 30% by weight or more, preferably 32% by weight or more. When the vinyl content of SBR (1) is less than 30% by weight, the grip performance is not sufficiently improved. Further, the vinyl content of SBR (1) is preferably 65% by weight or less, and more preferably 60% by weight or less. When the vinyl content of SBR (1) exceeds 65% by weight, the wear resistance tends to decrease.
SBR(1)としては、スチレン含有量およびビニル含有量が前記範囲内にあれば、単独で用いてもよく、2種以上を組み合わせて用いてもよい。   As SBR (1), if a styrene content and vinyl content are in the said range, it may be used independently and may be used in combination of 2 or more type.
SBR(1)の含有率は、ゴム成分中に15重量%以上、好ましくは30重量%以上である。SBR(1)の含有率が15重量%未満では、グリップ性能が充分に向上しない。また、SBR(1)の含有率は90重量%以下が好ましく、60重量%以下がより好ましい。SBR(1)の含有率が90重量%をこえると、発熱が大きくなる傾向がある。   The content of SBR (1) is 15% by weight or more, preferably 30% by weight or more in the rubber component. When the content of SBR (1) is less than 15% by weight, the grip performance is not sufficiently improved. Moreover, 90 weight% or less is preferable and, as for the content rate of SBR (1), 60 weight% or less is more preferable. When the content of SBR (1) exceeds 90% by weight, heat generation tends to increase.
SBR(2)のスチレン含有量は5重量%以上が好ましく、8重量%以上がより好ましい。SBR(2)のスチレン含有量が5重量%未満では、グリップが充分ではない傾向がある。また、SBR(2)のスチレン含有量は15重量%以下、好ましくは12重量%以下である。SBR(2)のスチレン含有量が15重量%をこえると、転がり抵抗が増大するだけでなく、氷雪上性能や低温における耐クラック性なども低下する。   The styrene content of SBR (2) is preferably 5% by weight or more, and more preferably 8% by weight or more. When the styrene content of SBR (2) is less than 5% by weight, the grip tends to be insufficient. The styrene content of SBR (2) is 15% by weight or less, preferably 12% by weight or less. When the styrene content of SBR (2) exceeds 15% by weight, not only the rolling resistance increases, but also the performance on ice and snow, crack resistance at low temperature, and the like decrease.
SBR(2)のビニル含有量は20重量%以上が好ましく、30重量%以上がより好ましく、40重量%以上がさらに好ましい。SBR(2)のビニル含有量が20重量%未満では、グリップが充分ではない傾向がある。また、SBR(2)のビニル含有量は60重量%以下、好ましくは50重量%以下である。SBR(2)のビニル含有量が60重量%をこえると、転がり抵抗が増大する。   The vinyl content of SBR (2) is preferably 20% by weight or more, more preferably 30% by weight or more, and further preferably 40% by weight or more. When the vinyl content of SBR (2) is less than 20% by weight, the grip tends to be insufficient. Further, the vinyl content of SBR (2) is 60% by weight or less, preferably 50% by weight or less. When the vinyl content of SBR (2) exceeds 60% by weight, rolling resistance increases.
SBR(2)としては、スチレン含有量およびビニル含有量が前記範囲内にあれば、単独で用いてもよく、2種以上を組み合わせて用いてもよい。   As SBR (2), as long as styrene content and vinyl content are in the said range, it may be used independently and may be used in combination of 2 or more type.
SBR(2)の含有率は、ゴム成分中に10重量%以上、好ましくは15重量%以上である。SBR(2)の含有率が10重量%未満では、転がり抵抗が増大する。また、SBR(2)の含有率は85重量%以下が好ましく、50重量%以下がより好ましい。SBR(2)の含有率が85重量%をこえると、グリップが充分ではない傾向がある。   The content of SBR (2) is 10% by weight or more, preferably 15% by weight or more in the rubber component. When the content of SBR (2) is less than 10% by weight, rolling resistance increases. Further, the content of SBR (2) is preferably 85% by weight or less, and more preferably 50% by weight or less. When the content of SBR (2) exceeds 85% by weight, the grip tends to be insufficient.
SBR(1)およびSBR(2)の合計含有率は、ゴム成分中に60重量%以上、好ましくは70重量%以上である。SBR(1)およびSBR(2)の合計含有率が60重量%未満では、転がり抵抗特性とグリップ性能とをバランスよく向上させることができない。また、SBR(1)およびSBR(2)の合計含有率は100重量%以下が好ましく、90重量%以下がより好ましく、80重量%以下がさらに好ましい。   The total content of SBR (1) and SBR (2) is 60% by weight or more, preferably 70% by weight or more in the rubber component. When the total content of SBR (1) and SBR (2) is less than 60% by weight, rolling resistance characteristics and grip performance cannot be improved in a balanced manner. The total content of SBR (1) and SBR (2) is preferably 100% by weight or less, more preferably 90% by weight or less, and still more preferably 80% by weight or less.
前記ゴム成分には、SBR(1)およびSBR(2)以外のゴム、たとえば、SBR(1)およびSBR(2)以外のSBR、天然ゴム(NR)、ブタジエンゴム(BR)、イソプレンゴム(IR)、アクリロニトリルブタジエンゴム(NBR)、クロロプレンゴム(CR)、ブチルゴム(IIR)、スチレンイソプレンブタジエンゴム(SIBR)などがあげられ、これらのSBR(1)およびSBR(2)以外のゴムとしては、引張強度に優れているという理由から、NRが好ましい。   Examples of the rubber component include rubbers other than SBR (1) and SBR (2), such as SBR other than SBR (1) and SBR (2), natural rubber (NR), butadiene rubber (BR), and isoprene rubber (IR). ), Acrylonitrile butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), styrene isoprene butadiene rubber (SIBR), etc., and rubbers other than these SBR (1) and SBR (2) are tensile. NR is preferred because of its excellent strength.
シリカとしては、とくに制限はないが、乾式法シリカ(無水ケイ酸)、湿式法シリカ(無水ケイ酸)などがあげられ、シラノール基が多いという理由から、湿式法シリカが好ましい。   The silica is not particularly limited, and examples thereof include dry method silica (anhydrous silicic acid), wet method silica (anhydrous silicic acid), and wet method silica is preferred because it has many silanol groups.
シリカの窒素吸着比表面積(N2SA)は20m2/g以上、好ましくは40m2/g以上、より好ましくは80m2/g以上、さらに好ましくは120m2/g以上、とくに好ましくは200m2/g以上、もっとも好ましくは250m2/g以上である。シリカのN2SAが20m2/g未満では、耐摩耗性が低下する。また、シリカのN2SAは500m2/g以下、好ましくは480m2/g以下、より好ましくは450m2/g以下である。シリカのN2SAが500m2/gをこえると、発熱が大きくなるうえにゴム混練の加工性が低下する。 Nitrogen adsorption specific surface area (N 2 SA) of silica is 20 m 2 / g or more, preferably 40 m 2 / g or more, more preferably 80 m 2 / g or more, more preferably 120 m 2 / g or more, particularly preferably 200 meters 2 / g or more, most preferably 250 m 2 / g or more. When the N 2 SA of silica is less than 20 m 2 / g, the wear resistance is lowered. Further, N 2 SA of silica is 500 m 2 / g or less, preferably 480 m 2 / g or less, more preferably 450 m 2 / g or less. If the N 2 SA of silica exceeds 500 m 2 / g, the heat generation increases and the processability of rubber kneading decreases.
シリカを水に分散させて5%水性分散液にしたときのpH(5%pH)は7以上が好ましく、7.2以上がより好ましい。シリカの5%pHが7未満では、シランカップリング剤との反応速度が遅くなり、混練り時間が増大する傾向がある。また、シリカの5%pHは12以下が好ましく、10以下がより好ましい。シリカの5%pHが12をこえるシリカを製造するのは困難な傾向がある。   When the silica is dispersed in water to form a 5% aqueous dispersion, the pH (5% pH) is preferably 7 or more, and more preferably 7.2 or more. When the 5% pH of silica is less than 7, the reaction rate with the silane coupling agent tends to be slow, and the kneading time tends to increase. Further, the 5% pH of silica is preferably 12 or less, and more preferably 10 or less. It tends to be difficult to produce silica where the 5% pH of the silica exceeds 12.
シリカの含有量は15重量部以上、好ましくは40重量部以上である。シリカの含有量が15重量部未満では、シリカの配合による充分な効果が得られない。また、シリカの含有量は150重量部以下、好ましくは120重量部以下である。シリカの含有量が150重量部をこえると、シリカのゴムへの分散が困難になりゴムの加工性が悪化する。   The content of silica is 15 parts by weight or more, preferably 40 parts by weight or more. When the content of silica is less than 15 parts by weight, a sufficient effect due to the blending of silica cannot be obtained. The silica content is 150 parts by weight or less, preferably 120 parts by weight or less. If the silica content exceeds 150 parts by weight, it will be difficult to disperse the silica in the rubber, and the processability of the rubber will deteriorate.
本発明では、SBR(1)およびSBR(2)を所定含有率含むゴム成分およびシリカを所定量含有することで、ウェットグリップ性能を低下させることなく、転がり抵抗を低減させることができる。   In the present invention, the rolling resistance can be reduced without deteriorating the wet grip performance by containing a predetermined amount of the rubber component and silica containing the predetermined content of SBR (1) and SBR (2).
本発明では、シリカとともにシランカップリング剤を併用することができる。   In the present invention, a silane coupling agent can be used in combination with silica.
本発明で好適に使用されるシランカップリング剤としては、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とすることができ、たとえば、ビス(3−トリエトキシシリルプロピル)ポリスルフィド、ビス(2−トリエトキシシリルエチル)ポリスルフィド、ビス(3−トリメトキシシリルプロピル)ポリスルフィド、ビス(2−トリメトキシシリルエチル)ポリスルフィド、ビス(4−トリエトキシシリルブチル)ポリスルフィド、ビス(4−トリメトキシシリルブチル)ポリスルフィドなどがあげられ、これらのシランカップリング剤は単独で用いてもよく、2種以上を組み合わせて用いてもよい。   As the silane coupling agent suitably used in the present invention, any silane coupling agent conventionally used in combination with silica can be used. For example, bis (3-triethoxysilylpropyl) polysulfide, bis (2 -Triethoxysilylethyl) polysulfide, bis (3-trimethoxysilylpropyl) polysulfide, bis (2-trimethoxysilylethyl) polysulfide, bis (4-triethoxysilylbutyl) polysulfide, bis (4-trimethoxysilylbutyl) Examples thereof include polysulfides, and these silane coupling agents may be used alone or in combination of two or more.
シランカップリング剤をシリカと併用する場合、シランカップリング剤の含有量は、シリカ100重量部に対して2重量部以上が好ましく、8重量部以上がより好ましい。シランカップリング剤の含有量が2重量部未満では、耐摩耗性の改善効果が不十分な傾向がある。また、シランカップリング剤の含有量は20重量部以下が好ましく、16重量部以下がより好ましい。シランカップリング剤の含有量が20重量部をこえると、物性の改善効果が減少する傾向がある。   When the silane coupling agent is used in combination with silica, the content of the silane coupling agent is preferably 2 parts by weight or more and more preferably 8 parts by weight or more with respect to 100 parts by weight of silica. When the content of the silane coupling agent is less than 2 parts by weight, the effect of improving the wear resistance tends to be insufficient. Further, the content of the silane coupling agent is preferably 20 parts by weight or less, and more preferably 16 parts by weight or less. When the content of the silane coupling agent exceeds 20 parts by weight, the physical property improving effect tends to decrease.
本発明のゴム組成物には、前記ゴム成分、シリカおよびシランカップリング剤の他に、ゴム工業で一般に使用される配合剤、たとえば、カーボンブラック、クレーなどの充填剤、各種老化防止剤、プロセスオイル、硫黄などの加硫剤、ステアリン酸、ワックス、酸化亜鉛などを必要に応じて適宜含有することができる。   In the rubber composition of the present invention, in addition to the rubber component, silica and silane coupling agent, compounding agents generally used in the rubber industry, for example, fillers such as carbon black and clay, various antioxidants, processes Oils, sulfur and other vulcanizing agents, stearic acid, wax, zinc oxide and the like can be appropriately contained as necessary.
本発明のゴム組成物は、転がり抵抗特性およびグリップ性能をバランスよく向上させられるという理由から、トレッド用ゴム組成物とすることが好ましい。   The rubber composition of the present invention is preferably a tread rubber composition because the rolling resistance characteristics and grip performance can be improved in a balanced manner.
本発明のタイヤは、本発明のゴム組成物を用いて、通常の方法によって製造される。すなわち、必要に応じて前記各種薬品を配合した本発明のゴム組成物を、未加硫の段階でタイヤの各部材の形状に合わせて押し出し加工し、タイヤ成型機上にて成形し、未加硫タイヤを形成する。この未加硫タイヤを加硫機中で加熱加圧して本発明のタイヤを得る。   The tire of the present invention is produced by an ordinary method using the rubber composition of the present invention. That is, if necessary, the rubber composition of the present invention containing the various chemicals is extruded in accordance with the shape of each member of the tire at an unvulcanized stage, molded on a tire molding machine, and unvulcanized. Form a sulfur tire. This unvulcanized tire is heated and pressurized in a vulcanizer to obtain the tire of the present invention.
実施例にもとづいて、本発明を具体的に説明するが、本発明はこれらのみに限定されるものではない。   The present invention will be specifically described based on examples, but the present invention is not limited to these examples.
以下に、実施例および比較例で使用した各種薬品をまとめて示す。
スチレンブタジエンゴム1(SBR1):旭化成ケミカルズ(株)製のタフデン3335(スチレン含有量:35重量%、ビニル含有量:33重量%、ゴム固形分100重量部に対してオイル分37.5重量部含有)
スチレンブタジエンゴム2(SBR2):炭化水素溶媒中で、スチレンと1,3−ブタジエンとをアルキルリチウム開始剤を用いて重合(スチレン含有量:10重量%、ビニル含有量:45重量%)
スチレンブタジエンゴム3(SBR3):旭化成ケミカルズ(株)製のタフデン3330(スチレン含有量:31重量%、ビニル含有量:33重量%、ゴム固形分100重量部に対してオイル分37.5重量部含有)
スチレンブタジエンゴム4(SBR4):日本ゼオン(株)製のNS112R(スチレン含有量:15重量%、ビニル含有量:30重量%)
天然ゴム(NR)
シリカ:デグッサ製のCarplex♯67(N2SA:429m2/g、5%pH:7.4)
シランカップリング剤:デグッサ製のSi75(ビス(3−トリエトキシシリルプロピル)ジスルフィド)
アロマチックオイル:出光興産(株)製のダイアナプロセスAH−24
酸化亜鉛:三井金属鉱業(株)製
ステアリン酸:日本油脂(株)製のステアリン酸「つばき」
老化防止剤:住友化学(株)製のアンチゲン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))
ワックス:大内新興化学工業(株)製のサンノックN
硫黄:軽井沢硫黄(株)製の粉末硫黄
加硫促進剤CZ:大内新興化学工業(株)製のノクセラーCZ(N−シクロヘキシル−2−ベンゾチアゾリルスルフェンアミド)
加硫促進剤DPG:大内新興化学工業(株)製のノクセラーD(1,3−ジフェニルグアニジン)
Below, the various chemical | medical agents used by the Example and the comparative example are shown collectively.
Styrene butadiene rubber 1 (SBR1): Toughden 3335 manufactured by Asahi Kasei Chemicals Corporation (styrene content: 35% by weight, vinyl content: 33% by weight, 37.5 parts by weight of oil with respect to 100 parts by weight of rubber solid content) Contains)
Styrene butadiene rubber 2 (SBR2): Polymerization of styrene and 1,3-butadiene using a hydrocarbon alkyl solvent with an alkyl lithium initiator (styrene content: 10 wt%, vinyl content: 45 wt%)
Styrene butadiene rubber 3 (SBR3): Toughden 3330 manufactured by Asahi Kasei Chemicals Corporation (styrene content: 31% by weight, vinyl content: 33% by weight, 37.5 parts by weight of oil with respect to 100 parts by weight of rubber solid content) Contains)
Styrene butadiene rubber 4 (SBR4): NS112R manufactured by Nippon Zeon Co., Ltd. (styrene content: 15% by weight, vinyl content: 30% by weight)
Natural rubber (NR)
Silica: Carplex # 67 manufactured by Degussa (N 2 SA: 429 m 2 / g, 5 % pH: 7.4)
Silane coupling agent: Si75 (bis (3-triethoxysilylpropyl) disulfide) manufactured by Degussa
Aromatic oil: Diana Process AH-24 manufactured by Idemitsu Kosan Co., Ltd.
Zinc oxide: Stearic acid manufactured by Mitsui Mining & Smelting Co., Ltd .: Tsubaki stearic acid manufactured by Nippon Oil & Fats Co., Ltd.
Anti-aging agent: Antigen 6C (N- (1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine)) manufactured by Sumitomo Chemical Co., Ltd.
Wax: Sunnock N manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
Sulfur: Powder sulfur vulcanization accelerator manufactured by Karuizawa Sulfur Co., Ltd. CZ: Noxeller CZ (N-cyclohexyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Vulcanization accelerator DPG: Noxeller D (1,3-diphenylguanidine) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
実施例1〜2、参考例3および比較例1〜4
表1の配合処方にしたがい、バンバリーミキサーを用いて、硫黄および加硫促進剤以外の薬品を150℃の条件下で4分間混練りし、混練り物を得た。次に、オープンロールを用いて、得られた混練り物に硫黄および加硫促進剤を添加し、80℃の条件下で3分間混練りし、未加硫ゴム組成物を得た。得られた未加硫ゴム組成物をトレッド形状に成形し、他のタイヤ部材と張り合わせて未加硫タイヤを作製し、プレス加硫することで、実施例1〜2、参考例3および比較例1〜4の試験用タイヤ(タイヤサイズ:195/65R15)を製造した。
Examples 1-2 , Reference Example 3 and Comparative Examples 1-4
According to the formulation of Table 1, chemicals other than sulfur and vulcanization accelerator were kneaded for 4 minutes at 150 ° C. using a Banbury mixer to obtain a kneaded product. Next, using an open roll, sulfur and a vulcanization accelerator were added to the obtained kneaded product, and kneaded for 3 minutes at 80 ° C. to obtain an unvulcanized rubber composition. The obtained unvulcanized rubber composition is molded into a tread shape, and pasted with other tire members to produce an unvulcanized tire, and press vulcanized, so that Examples 1-2 , Reference Example 3 and Comparative Example 1-4 test tires (tire size: 195 / 65R15) were produced.
(転がり抵抗)
転がり抵抗試験機を用いて、試験用タイヤを、リム:15×6JJ、内圧:230kPa、荷重:3.43kN、速度:80km/hの条件下で走行させたときの転がり抵抗を測定し、比較例1の転がり抵抗指数を100とし、下記計算式により、各配合の転がり抵抗を指数表示した。なお、転がり抵抗指数が大きいほど、転がり抵抗が低減され、低燃費性に優れることを示す。
(転がり抵抗指数)=(比較例1の転がり抵抗)/(各配合の転がり抵抗)×100
(Rolling resistance)
Using a rolling resistance tester, the rolling resistance when the test tire was run under the conditions of rim: 15 × 6JJ, internal pressure: 230 kPa, load: 3.43 kN, speed: 80 km / h, was compared. The rolling resistance index of Example 1 was set to 100, and the rolling resistance of each formulation was indicated by an index according to the following formula. In addition, it shows that rolling resistance is reduced and a fuel-consumption property is excellent, so that a rolling resistance index | exponent is large.
(Rolling resistance index) = (Rolling resistance of Comparative Example 1) / (Rolling resistance of each formulation) × 100
(ウェットグリップ性能)
製造した試験用タイヤを試験用の車輌(国産FF2000cc)の全輪に装着させ、湿潤アスファルト路面のテストコースにて実車走行を行なった。このとき、100km/hで走行させ、ブレーキをかけてから停止するまでの制動距離を測定し、比較例1のウェットグリップ性能指数を100とし、下記計算式により、各配合のウェットグリップ性能を指数表示した。なお、ウェットグリップ性能指数が大きいほど、ウェットグリップ性能に優れていることを示す。
(ウェットグリップ性能指数)=(比較例1の制動距離)
÷(各配合の制動距離)×100
(Wet grip performance)
The manufactured test tire was mounted on all wheels of a test vehicle (domestic FF2000cc), and the vehicle was run on a test course on a wet asphalt road surface. At this time, the vehicle was run at 100 km / h, the braking distance from when the brake was applied to when it was stopped was measured, the wet grip performance index of Comparative Example 1 was set to 100, and the wet grip performance of each formulation was indexed according to the following formula. displayed. In addition, it shows that it is excellent in wet grip performance, so that a wet grip performance index | exponent is large.
(Wet grip performance index) = (braking distance of Comparative Example 1)
÷ (Brake distance for each formulation) × 100
前記試験の結果を表1に示す。   The results of the test are shown in Table 1.

Claims (2)

  1. スチレン含有量が33〜50重量%であり、ビニル含有量が30〜65重量%であるスチレンブタジエンゴム(1)を15〜60重量%、
    ならびにスチレン含有量が5〜12重量%であり、ビニル含有量が40〜60重量%であるスチレンブタジエンゴム(2)を15〜50重量%含有し、
    スチレンブタジエンゴム(1)およびスチレンブタジエンゴム(2)の合計含有率が60重量%以上であるゴム成分100重量部に対して、
    窒素吸着比表面積が20〜500m2/gであるシリカを15〜150重量部含有するゴム組成物であって、
    前記シリカが、水に分散させて5%水性分散液としたときのpHが7〜12であるものであるゴム組成物
    15-60 wt% of styrene butadiene rubber (1) having a styrene content of 33-50 wt% and a vinyl content of 30-65 wt%,
    And 15 to 50% by weight of styrene-butadiene rubber (2) having a styrene content of 5 to 12% by weight and a vinyl content of 40 to 60% by weight,
    For 100 parts by weight of the rubber component in which the total content of the styrene butadiene rubber (1) and the styrene butadiene rubber (2) is 60% by weight or more,
    A rubber composition containing 15 to 150 parts by weight of silica having a nitrogen adsorption specific surface area of 20 to 500 m 2 / g ,
    A rubber composition having a pH of 7 to 12 when the silica is dispersed in water to form a 5% aqueous dispersion .
  2. 請求項1記載のゴム組成物を用いたタイヤ。 Tire using the claim 1 Symbol placement of the rubber composition.
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