JP6424594B2 - Rubber composition and pneumatic tire using the same - Google Patents
Rubber composition and pneumatic tire using the same Download PDFInfo
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- JP6424594B2 JP6424594B2 JP2014243111A JP2014243111A JP6424594B2 JP 6424594 B2 JP6424594 B2 JP 6424594B2 JP 2014243111 A JP2014243111 A JP 2014243111A JP 2014243111 A JP2014243111 A JP 2014243111A JP 6424594 B2 JP6424594 B2 JP 6424594B2
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- 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
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Description
本発明は、ゴム組成物およびそれを用いた空気入りタイヤに関するものであり、詳しくは、低転がり抵抗性、耐グルーブクラック性能、耐摩耗性能をいずれも向上させ得るゴム組成物およびそれを用いた空気入りタイヤに関するものである。 The present invention relates to a rubber composition and a pneumatic tire using the same, and more particularly, to a rubber composition capable of improving any of a low rolling resistance, a groove crack resistance performance and an abrasion resistance performance, and the same It relates to a pneumatic tire.
近年の環境意識の高まりに伴い、タイヤの低燃費性を向上させることが求められ、コンパウンドの低発熱化が広く検討されている。
また、キャップトレッドの厚さを全体的に薄くすることにより、低転がり抵抗性を得ることができるが、この場合、グルーブクラック(GC)が発生したり、耐摩耗性能が低下する等の問題点が生じる。
With the recent increase in environmental awareness, it is required to improve the fuel efficiency of the tire, and the reduction of heat generation of the compound is widely studied.
In addition, low rolling resistance can be obtained by reducing the thickness of the cap tread as a whole, but in this case, problems such as generation of groove cracks (GC) and deterioration in wear resistance performance can be obtained. Will occur.
なお下記特許文献1には、ゴム材料を特定構造のメチレンビス(アルキルスルフィド)およびフェノール系酸化防止剤等から選ばれる劣化防止剤とを混合する技術が開示されている。しかし特許文献1には、下記で説明する本発明のスチレン化フェノール化合物については開示も示唆もない。また、特定のスチレン化フェノール化合物を用いて低転がり抵抗性、耐グルーブクラック性能、耐摩耗性能を同時に改善しようとする技術思想は何ら開示されていない。 Patent Document 1 below discloses a technique of mixing a rubber material with an antidegradant selected from methylenebis (alkyl sulfide) having a specific structure, a phenolic antioxidant, and the like. However, Patent Document 1 does not disclose or suggest the styrenated phenol compound of the present invention described below. In addition, there is no disclosure of a technical idea to simultaneously improve low rolling resistance, groove crack performance, and abrasion resistance performance by using a specific styrenated phenol compound.
したがって本発明の目的は、低転がり抵抗性、耐グルーブクラック性能、耐摩耗性能をいずれも向上させ得るゴム組成物およびそれを用いた空気入りタイヤを提供することにある。 Therefore, an object of the present invention is to provide a rubber composition capable of improving any of low rolling resistance, groove crack resistance performance and wear resistance performance, and a pneumatic tire using the same.
本発明者らは鋭意研究を重ねた結果、特定の平均ガラス転移温度(Tg)を有するジエン系ゴムに対し、特定のスチレン化フェノール化合物およびシリカを特定量でもって配合することにより、上記課題を解決できることを見出し、本発明を完成することができた。
すなわち本発明は以下のとおりである。
As a result of intensive studies, the present inventors have found that the above problems can be solved by blending a specific styrenated phenol compound and silica in a specific amount with a diene rubber having a specific average glass transition temperature (Tg). It has been found that it can be solved and the present invention has been completed.
That is, the present invention is as follows.
1.ジエン系ゴム100質量部に対し、ジスチレン化フェノールまたはトリスチレン化フェノールを主成分とするスチレン化フェノール化合物を0.5〜20質量部およびシリカを10質量部以上90質量部未満配合し、前記ジエン系ゴムの平均ガラス転移温度(Tg)が−60〜−20℃であることを特徴とするゴム組成物。
2.前記ジエン系ゴムが、スチレン−ブタジエン共重合体ゴムを含有することを特徴とする前記1に記載のゴム組成物。
3.前記1または2に記載のゴム組成物をトレッドに使用した空気入りタイヤ。
1. 0.5 to 20 parts by mass of a styrenated phenol compound mainly composed of distyrenated phenol or tristyrenated phenol and 10 parts by mass or more and less than 90 parts by mass of silica based on 100 parts by mass of a diene rubber A rubber composition characterized in that the average glass transition temperature (Tg) of the rubber system is -60 to -20 ° C.
2. The rubber composition as described in 1 above, wherein the diene rubber contains a styrene-butadiene copolymer rubber.
3. The pneumatic tire which used the rubber composition as described in said 1 or 2 for the tread.
本発明によれば、特定の平均Tgを有するジエン系ゴムに対し、特定のスチレン化フェノール化合物およびシリカを特定量でもって配合したので、低転がり抵抗性、耐グルーブクラック性能、耐摩耗性能をいずれも向上させ得るゴム組成物およびそれを用いた空気入りタイヤを提供することができる。 According to the present invention, since a specific styrenated phenol compound and silica are compounded in a specific amount to a diene rubber having a specific average Tg, any of low rolling resistance, groove crack resistance and wear resistance can be obtained. It is possible to provide a rubber composition that can be improved and a pneumatic tire using the same.
以下、本発明をさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail.
(ジエン系ゴム)
本発明で使用されるジエン系ゴムは、ゴム組成物に配合することができる任意のジエン系ゴムを用いることができ、例えば、天然ゴム(NR)、イソプレンゴム(IR)、ブタジエンゴム(BR)、スチレン−ブタジエン共重合体ゴム(SBR)、アクリロニトリル−ブタジエン共重合体ゴム(NBR)、エチレン−プロピレン−ジエンターポリマー(EPDM)等が挙げられる。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。また、その分子量やミクロ構造はとくに制限されず、アミン、アミド、シリル、アルコキシシリル、カルボキシル、ヒドロキシル基等で末端変性されていても、エポキシ化されていてもよい。中でも本発明の効果向上の観点から、SBRを配合するのが好ましい。SBRの配合量は、ジエン系ゴム全体を100質量部としたときに、60〜100質量部であるのが好ましい。
また本発明で使用されるジエン系ゴムは、平均ガラス転移温度(平均Tg)が−60〜−20℃であることが必要である。平均Tg−60℃未満であると、低転がり抵抗性を得ることができない。逆に−20℃を超えると、耐摩耗性が悪化する。平均Tgは、ガラス転移温度の平均値であり、各ジエン系ゴムのガラス転移温度と各ジエン系ゴムの配合割合から平均値として算出することができる。すなわち平均Tgは、各成分のガラス転移温度に、各成分の重量分率を乗じた積の合計、すなわち加重平均に基づき算出される値である。
(Diene rubber)
The diene-based rubber used in the present invention may be any diene-based rubber that can be added to the rubber composition. For example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR) And styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber (NBR), ethylene-propylene-diene terpolymer (EPDM) and the like. These may be used alone or in combination of two or more. The molecular weight and microstructure thereof are not particularly limited, and may be terminally modified with an amine, amide, silyl, alkoxysilyl, carboxyl, hydroxyl group or the like, or may be epoxidized. Above all, it is preferable to blend SBR from the viewpoint of improving the effect of the present invention. The blending amount of SBR is preferably 60 to 100 parts by mass based on 100 parts by mass of the entire diene rubber.
The diene rubber used in the present invention is required to have an average glass transition temperature (average Tg) of -60 to -20.degree. Low rolling resistance can not be obtained as it is less than average Tg-60 degreeC. On the other hand, when the temperature exceeds -20 ° C, the abrasion resistance is deteriorated. The average Tg is an average value of the glass transition temperature, and can be calculated as an average value from the glass transition temperature of each diene rubber and the blending ratio of each diene rubber. That is, the average Tg is the sum of products obtained by multiplying the glass transition temperature of each component by the weight fraction of each component, that is, the value calculated based on the weighted average.
(スチレン化フェノール化合物)
スチレン化フェノール化合物は、下記式で表すことができる。
(Styrenated phenolic compound)
The styrenated phenol compound can be represented by the following formula.
本発明で使用されるスチレン化フェノール化合物は、nが2であるジスチレン化フェノールまたはnが3であるトリスチレン化フェノールを主成分とする。本発明で使用されるスチレン化フェノール化合物は、公知の製造方法により製造することができ、また商業的に入手も可能である、市販品としては、例えば三光(株)製SP−24(ジスチレン化フェノールを主成分とする)、TSP(トリスチレン化フェノールを主成分とする)等が挙げられる。 The styrenated phenol compound used in the present invention is mainly composed of distynylated phenol in which n is 2 or tristyrenated phenol in which n is 3. The styrenated phenol compound used in the present invention can be produced by a known production method, and is commercially available. As a commercial product, for example, SP-24 (a styrenated product from Sanko Co., Ltd.) And phenol, and TSP (having tristyrenated phenol as a main component).
一般的に製造されたスチレン化フェノール化合物は、フェノール1モルに対してスチレン1モルが付加したモノスチレン化フェノール(上記式中、n=1);フェノール1モルに対してスチレン2モルが付加したジスチレン化フェノール(上記式中、n=2);フェノール1モルに対してスチレン3モルが付加したトリスチレン化フェノール(上記式中、n=3);およびその他の成分の混合物となる。本発明では、これらのスチレン化フェノール化合物のうち、主成分としてジスチレン化フェノールおよびトリスチレン化フェノールを使用する。上述のように製造されたスチレン化フェノール化合物は、主に、モノ、ジおよびトリ体の混合物であるので、本発明で使用されるスチレン化フェノール化合物は、モノ体がある程度存在することができる。したがって本発明で言う、「ジスチレン化フェノールまたはトリスチレン化フェノールを主成分とする」とは、ジスチレン化フェノールまたはトリスチレン化フェノールが全体の50モル%以上、好ましくは60モル%以上、さらに好ましくは65モル%以上を占めることを意味し、それ以外の成分としてモノスチレン化フェノールやその他の成分(例えばテトラ体あるいはそれ以上の付加物のスチレン化フェノール化合物)が含まれていてもよい。 A styrenated phenol compound generally produced is a mono-styrenated phenol in which 1 mol of styrene is added to 1 mol of phenol (in the above formula, n = 1); 2 mol of styrene is added to 1 mol of phenol A mixture of distyrenated phenol (in the above formula, n = 2); tristyrenated phenol in which 3 moles of styrene is added to 1 mole of phenol (in the above formula, n = 3); and other components. In the present invention, of these styrenated phenol compounds, distyrenated phenol and tristyrenated phenol are used as main components. The styrenated phenolic compound produced as described above is mainly a mixture of mono-, di- and tri-isomers, so the styrenated phenolic compound used in the present invention may exist to some extent as a mono-isomer. Therefore, the phrase "based on distynylated phenol or tristyrenated phenol" as used in the present invention means that 50% or more, preferably 60% or more, and more preferably 50% or more, of the total of the stythenylated phenol or tristyrenated phenol is used. It means that it occupies 65 mol% or more, and mono-styrenated phenol and other components (for example, styrenated phenol compounds of tetra- or higher adducts) may be contained as other components.
なお、上記式におけるスチレン部位は、スチレンの誘導体であってもよい。例えば、α−メチルスチレン、o−メチルスチレン、1,3−ジメチルスチレン等が挙げられる。 The styrene moiety in the above formula may be a derivative of styrene. For example, α-methylstyrene, o-methylstyrene, 1,3-dimethylstyrene and the like can be mentioned.
(シリカ)
本発明で使用されるシリカとしては、乾式シリカ、湿式シリカ、コロイダルシリカおよび沈降シリカなど、従来からゴム組成物において使用することが知られている任意のシリカを単独でまたは2種以上組み合わせて使用できる。
なお本発明では、本発明の効果がさらに向上するという観点から、シリカのCTAB比表面積(JIS K6217−3)は、50〜300m2/gであるのが好ましく、100〜250m2/gであるのがさらに好ましい。
(silica)
As the silica used in the present invention, any silica conventionally known to be used in rubber compositions, such as dry silica, wet silica, colloidal silica and precipitated silica, may be used alone or in combination of two or more. it can.
In the present invention, from the viewpoint of the effect of the present invention is further improved, CTAB specific surface area of the silica (JIS K6217-3) is preferably from 50 to 300 m 2 / g, is 100 to 250 m 2 / g Is more preferred.
(ゴム組成物の配合割合)
本発明のゴム組成物は、ジエン系ゴム100質量部に対し、ジスチレン化フェノールまたはトリスチレン化フェノールを主成分とするスチレン化フェノール化合物を0.5〜20質量部およびシリカを10質量部以上90質量部未満配合することを特徴とする。
前記スチレン化フェノール化合物の配合量が0.5質量部未満であると、配合量が少な過ぎて本発明の効果を奏することができない。逆に20質量部を超えると耐摩耗性能が悪化する。
シリカの配合量が10質量部未満、あるいは90質量部以上であると、低転がり抵抗性を得ることができない。
さらに好ましい前記スチレン化フェノール化合物の配合量は、ジエン系ゴム100質量部に対し、1〜18質量部であり、とくに好ましい前記スチレン化フェノール化合物の配合量は、ジエン系ゴム100質量部に対し、2〜15質量部である。
さらに好ましい前記シリカの配合量は、ジエン系ゴム100質量部に対し、30〜85質量部である。
(Blending ratio of rubber composition)
The rubber composition of the present invention comprises 0.5 to 20 parts by mass of a styrenated phenol compound mainly composed of distyrenated phenol or tristyrenated phenol and 10 parts by mass or more of silica per 100 parts by mass of diene rubber. It is characterized by blending less than mass parts.
If the blending amount of the styrenated phenol compound is less than 0.5 parts by mass, the blending amount is too small to achieve the effects of the present invention. On the contrary, when it exceeds 20 mass parts, abrasion resistance performance will deteriorate.
If the blending amount of silica is less than 10 parts by mass, or 90 parts by mass or more, low rolling resistance can not be obtained.
More preferably, the blending amount of the styrenated phenol compound is 1 to 18 parts by mass with respect to 100 parts by mass of the diene rubber, and the blending amount of the styrenated phenol compound is particularly preferable with respect to 100 parts by mass of the diene rubber It is 2-15 mass parts.
The further preferable compounding quantity of said silica is 30-85 mass parts with respect to 100 mass parts of diene based rubbers.
(その他成分)
本発明におけるゴム組成物には、前記した成分に加えて、加硫又は架橋剤;加硫又は架橋促進剤;酸化亜鉛、カーボンブラック、クレー、タルク、炭酸カルシウムのような各種充填剤;老化防止剤;可塑剤などのゴム組成物に一般的に配合されている各種添加剤を配合することができ、かかる添加剤は一般的な方法で混練して組成物とし、加硫又は架橋するのに使用することができる。これらの添加剤の配合量も、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。
(Other ingredients)
In the rubber composition of the present invention, in addition to the components described above, a vulcanizing or crosslinking agent; a vulcanizing or crosslinking accelerator; various fillers such as zinc oxide, carbon black, clay, talc, calcium carbonate; Various additives which are generally compounded into rubber compositions such as plasticizers, etc., and such additives are kneaded by a general method to make a composition, vulcanized or crosslinked. It can be used. The blending amounts of these additives can also be conventional conventional blending amounts as long as the object of the present invention is not violated.
また本発明のゴム組成物は従来の空気入りタイヤの製造方法に従って空気入りタイヤを製造するのに適しており、トレッド、とくにキャップトレッドに適用するのがよい。 The rubber composition of the present invention is also suitable for producing a pneumatic tire according to a conventional method for producing a pneumatic tire, and is preferably applied to a tread, particularly a cap tread.
以下、本発明を実施例および比較例によりさらに説明するが、本発明は下記例に制限されるものではない。 Hereinafter, the present invention will be further described by way of examples and comparative examples, but the present invention is not limited to the following examples.
標準例1、実施例1〜8および比較例1〜4
サンプルの調製
表1に示す配合(質量部)において、加硫促進剤と硫黄を除く成分を1.7リットルの密閉式バンバリーミキサーで5分間混練した後、ゴムをミキサー外に放出して室温冷却させた。ついで、同バンバリーミキサーにて加硫促進剤および硫黄を加えてさらに混練し、ゴム組成物を得た。次に得られたゴム組成物を所定の金型中で160℃、20分間プレス加硫して加硫ゴム試験片を得、以下に示す試験法で加硫ゴム試験片の物性を測定した。
Standard Example 1, Examples 1 to 8 and Comparative Examples 1 to 4
Preparation of samples In the composition (parts by mass) shown in Table 1, the components except the vulcanization accelerator and sulfur are kneaded for 5 minutes with a 1.7 liter closed Banbury mixer, and then the rubber is discharged out of the mixer for cooling to room temperature. I did. Then, a vulcanization accelerator and sulfur were added by the same Banbury mixer, and the mixture was further kneaded to obtain a rubber composition. Next, the obtained rubber composition was press-cured for 20 minutes at 160 ° C. in a predetermined mold to obtain a vulcanized rubber test piece, and the physical properties of the vulcanized rubber test piece were measured by the test method shown below.
転がり抵抗性:JIS K6394:2007に準じて、(株)東洋精機製作所製、粘弾性スペクトロメーターを用い、伸張変形歪率10±2%、振動数20Hz、温度60℃の条件で、tanδ(60℃)を測定した。結果は、標準例1の値を100として指数表示した。指数が小さいほど低転がり抵抗性であることを示す。
耐グルーブクラック性能:JIS K6259:2004に準じて測定を行った。結果は、標準例1の値を100として指数表示した。指数が大きいほど耐グルーブクラック性能に優れることを示す。
耐摩耗性能:JIS K6254−2:2005に準じて測定を行った。結果は、標準例1の値を100として指数表示した。指数が大きいほど耐摩耗性能に優れることを示す。
結果を表1に示す。
Rolling resistance: using a visco-elasticity spectrometer manufactured by Toyo Seiki Seisaku-sho, Ltd., in accordance with JIS K 6394: 2007, using an elastic deformation strain rate of 10 ± 2%, a frequency of 20 Hz and a temperature of 60 ° C., tan δ (60 C) was measured. The results are expressed exponentially with the value of standard example 1 being 100. The smaller the index is, the lower the rolling resistance is.
Groove crack resistance performance: Measured according to JIS K 6259: 2004. The results are expressed exponentially with the value of standard example 1 being 100. The larger the index, the better the groove crack resistance.
Wear resistance performance: Measurement was performed according to JIS K 6254-2: 2005. The results are expressed exponentially with the value of standard example 1 being 100. The larger the index, the better the wear resistance.
The results are shown in Table 1.
*1:SBR−1(日本ゼオン(株)製Nipol 1723、油展量=SBR100質量部に対し37.5質量部(表1の括弧内で実際のSBR量を記載した)、Tg=−55℃)
*2:SBR−2(日本ゼオン(株)製NS460、油展量=SBR100質量部に対し37.5質量部(表1では実際のSBR量を記載した)、Tg=−27℃)
*3:BR(日本ゼオン(株)製Nipol 1220、Tg=−106℃)
*4:カーボンブラック(キャボットジャパン(株)製N339)
*5:シリカ(ローディア社製ZEOSIL 1165MP、CTAB比表面積=159m2/g)
*6:酸化亜鉛(正同化学工業(株)製酸化亜鉛3種)
*7:ステアリン酸(日油(株)製ビーズステアリン酸)
*8:老化防止剤6C(Solutia Europe社製SANTOFLEX 6PPD)
*9:老化防止剤RD(NOCIL LIMITED社製PILNOX TDQ)
*10:シランカップリング剤(Evonik Degussa社製Si69)
*11:スチレン化フェノール化合物−1(三光(株)製SP−24。モノスチレン化フェノール0モル%、ジスチレン化フェノール60モル%以上、トリスチレン化フェノール40モル%以下)
*12:スチレン化フェノール化合物−2(三光(株)製TSP。モノスチレン化フェノール0モル%、ジスチレン化フェノール30モル%以下、トリスチレン化フェノール65モル%以上)
*13:スチレン化フェノール化合物−3(三光(株)製SP−F。モノスチレン化フェノール65モル%以上、ジスチレン化フェノール32モル%以下、トリスチレン化フェノール1モル%以下)
*14:アロマオイル(昭和シェル石油(株)製エキストラクト4号S)
*15:硫黄(鶴見化学工業(株)製金華印油入微粉硫黄、硫黄含有量=95.24質量%)
*16:加硫促進剤−1(住友化学(株)製ソクシノールD−G)
*17:加硫促進剤−2(大内新興化学工業(株)製ノクセラーCZ−G)
* 1: SBR-1 (Nipol 1723 manufactured by Nippon Zeon Co., Ltd., oil spread amount: 37.5 parts by mass with respect to 100 parts by mass of SBR (the actual SBR amount is described in parentheses in Table 1), Tg = -55 ° C)
* 2: SBR-2 (NS460 manufactured by Nippon Zeon Co., Ltd., oil spread amount: 37.5 parts by mass with respect to 100 parts by mass of SBR (the actual SBR amount is described in Table 1), Tg = -27 ° C.)
* 3: BR (Nipol 1220 manufactured by Nippon Zeon Co., Ltd., Tg = -106 ° C )
* 4: Carbon black (N339 manufactured by Cabot Japan Ltd.)
* 5: Silica (RODEA ZEOSIL 1165MP, CTAB specific surface area = 159 m 2 / g)
* 6: Zinc oxide (3 types of zinc oxide manufactured by Shodo Chemical Industry Co., Ltd.)
* 7: Stearic acid (manufactured by NOF Corporation beads stearic acid)
* 8: Anti-aging agent 6C (SANTOFLEX 6PPD manufactured by Solutia Europe)
* 9: Antioxidant RD (PILNOX TDQ manufactured by NOCIL LIMITED)
* 10: Silane coupling agent (Si69 manufactured by Evonik Degussa)
* 11: styrenated phenol compound 1 (SP-24 manufactured by Sanko Co., Ltd. 0 mol% of mono-styrenated phenol, 60 mol% or more of di-stylated phenol, and 40 mol% or less of tri-stylated phenol)
* 12: styrenated phenol compound-2 (TSP manufactured by Sanko Co., Ltd. 0 mol% of monostyrenated phenol, 30 mol% or less of distynylated phenol, 65 mol% or more of tristyrenated phenol)
* 13: Styrenated phenol compound-3 (SP-F manufactured by Sanko Co., Ltd. 65% by mol or more of monostyrenated phenol, 32% by mol or less of distynylated phenol, 1% by mol or less of tristyrenated phenol)
* 14: Aroma oil (Extract No. 4 S manufactured by Showa Shell Sekiyu KK)
* 15: Sulfur (fine sulfur with gold oil from Tsurumi Chemical Industries, Ltd., sulfur content = 95.24% by mass)
* 16: Vulcanization accelerator-1 (Succinil DG manufactured by Sumitomo Chemical Co., Ltd.)
* 17: Vulcanization accelerator-2 (Noccellar CZ-G manufactured by Ouchi Emerging Chemical Industry Co., Ltd.)
上記の表1の結果から明らかなように、実施例1〜8で得られたゴム組成物は、特定の平均Tgを有するジエン系ゴムに対し、特定のスチレン化フェノール化合物およびシリカを特定量でもって配合したので、従来の代表的な標準例1に対し、低転がり抵抗性、耐グルーブクラック性能、耐摩耗性能がいずれも向上している。
これに対し、比較例1は、モノスチレン化フェノールを主成分とするスチレン化フェノール化合物を使用しているので、耐摩耗性能の向上が確認されなかった。
比較例2は、ジエン系ゴムの平均Tgが本発明で規定する下限未満であるので、低転がり抵抗性が得られなかった。
比較例3は、シリカの配合量が本発明で規定する上限を超えているので、低転がり抵抗性が得られなかった。
比較例4は、シリカの配合量が本発明で規定する下限未満であるので、低転がり抵抗性が得られなかった。
比較例5は、スチレン化フェノール化合物の配合量が本発明で規定する下限未満であるので、各特性が向上しなかった。
比較例6は、スチレン化フェノール化合物の配合量が本発明で規定する上限を超えているので、耐摩耗性が悪化した。
As is clear from the results in Table 1 above, the rubber compositions obtained in Examples 1 to 8 were obtained in specific amounts of a specific styrenated phenol compound and silica relative to a diene rubber having a specific average Tg. As a result, the low rolling resistance, the groove crack resistance performance, and the wear resistance performance are improved as compared with the typical example 1 of the prior art.
On the other hand, Comparative Example 1 uses a styrenated phenol compound containing mono-styrenated phenol as a main component, and therefore, no improvement in the wear resistance performance was confirmed.
In Comparative Example 2, low rolling resistance was not obtained because the average Tg of the diene rubber is less than the lower limit defined in the present invention.
In Comparative Example 3, the low rolling resistance was not obtained because the blending amount of silica exceeds the upper limit defined in the present invention.
In Comparative Example 4, the low rolling resistance was not obtained because the blending amount of silica is less than the lower limit defined in the present invention.
In Comparative Example 5, each characteristic was not improved because the blending amount of the styrenated phenol compound is less than the lower limit defined in the present invention.
In Comparative Example 6, the abrasion resistance deteriorated because the blending amount of the styrenated phenol compound exceeded the upper limit defined in the present invention.
Claims (3)
前記スチレン化フェノール化合物は、ジスチレン化フェノールまたはトリスチレン化フェノールを主成分とし、
前記ジエン系ゴム100質量部に対し、前記スチレン化フェノール化合物を0.5〜20質量部および前記シリカを10質量部以上90質量部未満配合し、前記ジエン系ゴムの平均ガラス転移温度(Tg)が−60〜−20℃であることを特徴とするタイヤキャップトレッド用ゴム組成物。 A rubber composition for a tire cap tread comprising a diene rubber, a styrenated phenol compound, silica and carbon black,
The styrenated phenol compound is mainly composed of distynylated phenol or tristyrenated phenol,
The relative diene rubber 100 parts by weight, the styrenated phenolic compound 0.5 to 20 parts by weight and the silica blended is less than 90 parts by mass or more and 10 parts by mass or average glass transition temperature of the diene rubber (Tg) Is −60 to −20 ° C. A rubber composition for a tire cap tread .
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