JP5593669B2 - Rubber composition and pneumatic tire using the same - Google Patents

Rubber composition and pneumatic tire using the same Download PDF

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JP5593669B2
JP5593669B2 JP2009229758A JP2009229758A JP5593669B2 JP 5593669 B2 JP5593669 B2 JP 5593669B2 JP 2009229758 A JP2009229758 A JP 2009229758A JP 2009229758 A JP2009229758 A JP 2009229758A JP 5593669 B2 JP5593669 B2 JP 5593669B2
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諭 三原
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Yokohama Rubber Co Ltd
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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
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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、シリカの反応性、分散性を改善し、低い転がり抵抗と湿潤路面での高い制駆動性とを両立するとともに加工性も向上した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 rubber composition. Specifically, the reactivity and dispersibility of silica are improved, and both low rolling resistance and high braking / driving performance on a wet road surface are achieved. The present invention also relates to a rubber composition having improved processability and a pneumatic tire using the same.

近年、環境保護、省資源の観点からタイヤ用ゴム組成物におけるシリカの重要性が増加しており、シリカの反応を促進させたり、その分散性を向上させる分散剤の開発が盛んに行なわれている。   In recent years, the importance of silica in rubber compositions for tires has increased from the viewpoint of environmental protection and resource saving, and active efforts have been made to develop dispersants that promote the reaction of silica or improve its dispersibility. Yes.

下記特許文献1には、ジエン系ゴム成分、硫黄及びピリチオン金属塩を混練してゴム混合物を得、前記ゴム混合物を用いた後混合工程において加硫促進剤を添加混練し得られることを特徴とするタイヤ用ゴム組成物が開示されている。しかしながら特許文献1に開示されたタイヤ用ゴム組成物では、シリカの反応性、分散性が不十分であり、所望の転がり抵抗性、湿潤路面での制駆動性が得られず、また加工性にも改善の余地があった。   Patent Document 1 below is characterized in that a diene rubber component, sulfur and a pyrithione metal salt are kneaded to obtain a rubber mixture, and a vulcanization accelerator can be added and kneaded in a post-mixing step using the rubber mixture. A tire rubber composition is disclosed. However, in the tire rubber composition disclosed in Patent Document 1, the reactivity and dispersibility of silica are insufficient, and desired rolling resistance, braking / driving performance on wet road surfaces cannot be obtained, and processability is improved. There was also room for improvement.

特開2009−40898号公報JP 2009-40898 A

したがって本発明の目的は、公知技術よりもシリカの反応性、分散性を改善し、低い転がり抵抗と湿潤路面での高い制駆動性とを両立するとともに加工性も向上した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。   Accordingly, an object of the present invention is to improve the reactivity and dispersibility of silica as compared with known techniques, to achieve both a low rolling resistance and a high braking / driving performance on a wet road surface, and to improve the processability and a rubber composition It is to provide a used pneumatic tire.

本発明者らは鋭意研究を重ねた結果、ジエン系ゴムに特定の特性を有するシリカおよびシランカップリング剤を特定量配合し、かつ、特定のピリチオン化合物を特定量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。
1.ジエン系ゴム100質量部に対し、BET比表面積が155〜220gのシリカを20〜120質量部、シランカップリング剤を前記シリカに対して3〜15質量%配合し、さらに下記式1で表されるピリチオン化合物を0.2〜8.0質量部配合してなることを特徴とするゴム組成物。
As a result of intensive research, the inventors have formulated a specific amount of silica and a silane coupling agent having specific characteristics in a diene rubber, and have formulated a specific amount of a specific pyrithione compound to solve the above-mentioned problems. We have found that this can be solved, and have completed the present invention.
That is, the present invention is as follows.
1. 20 to 120 parts by mass of silica having a BET specific surface area of 155 to 220 m 2 / g and 3 to 15% by mass of a silane coupling agent with respect to the silica are added to 100 parts by mass of the diene rubber. A rubber composition comprising 0.2 to 8.0 parts by mass of a pyrithione compound represented by 1.

Figure 0005593669

(式1中、nは1または2を表す。nが1のとき、Qは水素原子またはNaを表す。nが2のとき、QはZn、CuまたはCaを表す)
2.前記1に記載のゴム組成物を使用した空気入りタイヤ。
Figure 0005593669

(In formula 1, n represents 1 or 2. When n is 1, Q represents a hydrogen atom or Na. When n is 2, Q represents Zn, Cu, or Ca.)
2. A pneumatic tire using the rubber composition described in 1 above.

本発明によれば、ジエン系ゴムに特定の特性を有するシリカおよびシランカップリング剤を特定量配合し、かつ、特定のピリチオン化合物を特定量配合することにより、シリカの反応性、分散性を改善し、低い転がり抵抗と湿潤路面での高い制駆動性とを両立するとともに加工性も向上した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, silica reactivity and dispersibility are improved by blending a specific amount of silica and a silane coupling agent having specific characteristics into a diene rubber and blending a specific amount of a specific pyrithione compound. In addition, it is possible to provide a rubber composition having both low rolling resistance and high braking / driving performance on a wet road surface, and improved workability, and a pneumatic tire using the rubber composition.

空気入りタイヤの一例の部分断面図である。It is a fragmentary sectional view of an example of a pneumatic tire.

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.

図1は、乗用車用の空気入りタイヤの一例の部分断面図である。
図1において、空気入りタイヤは左右一対のビード部1およびサイドウォール2と、両サイドウォール2に連なるトレッド3からなり、ビード部1、1間に繊維コードが埋設されたカーカス層4が装架され、カーカス層4の端部がビードコア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、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。
以下に説明する本発明のゴム組成物は、上記のようなタイヤ用の各種部材に有用であり、とくにトレッド3に有用である。
FIG. 1 is a partial cross-sectional view of an example of a pneumatic tire for a passenger car.
In FIG. 1, the pneumatic tire is composed of a pair of left and right bead portions 1 and sidewalls 2, and a tread 3 connected to both sidewalls 2, and a carcass layer 4 in which fiber cords are embedded between the bead portions 1 and 1 is mounted. Then, the end portion of the carcass layer 4 is turned up around the bead core 5 and the bead filler 6 from the tire inner side to the outer side. Further, in the tread 3, a belt layer 7 is disposed over the circumference of the tire outside the carcass layer 4.
The rubber composition of the present invention described below is useful for various members for tires as described above, and particularly useful for the tread 3.

(ジエン系ゴム)
本発明で使用されるジエン系ゴム成分は、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)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。
これらのジエン系ゴムの中でも、本発明の効果の点からジエン系ゴムはSBR、BRが好ましい。
(Diene rubber)
As the diene rubber component used in the present invention, any diene rubber that can be blended in the rubber composition can be used. For example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR) ), Styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber (NBR), and the like. These may be used alone or in combination of two or more. The molecular weight and microstructure 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.
Among these diene rubbers, SBR and BR are preferable as the diene rubber from the viewpoint of the effect of the present invention.

(シリカ)
本発明で使用されるシリカは、BET比表面積(ISO-04652-1: 1994に準拠して測定)が155m/g以上である必要がある。
BET比表面積が155m2/g未満では、湿潤路面での制駆動性が不十分となる。
好ましいBET比表面積は、155〜220m2/gであり、さらに好ましいBET比表面積は、155〜210m2/gである。
(silica)
The silica used in the present invention needs to have a BET specific surface area (measured according to ISO-04652-1: 1994) of 155 m 2 / g or more.
When the BET specific surface area is less than 155 m 2 / g, braking / driving performance on a wet road surface is insufficient.
A preferred BET specific surface area is 155 to 220 m 2 / g, and a more preferred BET specific surface area is 155 to 210 m 2 / g.

(シランカップリング剤)
本発明で使用されるシランカップリング剤は、とくに制限されないが、含硫黄シランカップリング剤が好ましく、例えば3−オクタノイルチオプロピルトリエトキシシラン、3−プロピオニルチオプロピルトリメトキシシラン、ビス−(3−ビストリエトキシシリルプロピル)−テトラスルフィド、ビス−(3−ビス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等が挙げられる。
(Silane coupling agent)
The silane coupling agent used in the present invention is not particularly limited, but a sulfur-containing silane coupling agent is preferable. For example, 3-octanoylthiopropyltriethoxysilane, 3-propionylthiopropyltrimethoxysilane, bis- (3 -Bistriethoxysilylpropyl) -tetrasulfide, bis- (3-bistriethoxysilylpropyl) -disulfide, 3-mercaptopropyltrimethoxysilane and the like.

(ピリチオン化合物)
本発明のゴム組成物は、下記式1で表されるピリチオン化合物を配合してなる。
(Pyrithione compound)
The rubber composition of the present invention comprises a pyrithione compound represented by the following formula 1.

Figure 0005593669
Figure 0005593669

(式1中、nは1または2を表す。nが1のとき、Qは水素原子またはNaを表す、nが2のとき、QはZn、CuまたはCaを表す) (In formula 1, n represents 1 or 2. When n is 1, Q represents a hydrogen atom or Na. When n is 2, Q represents Zn, Cu or Ca.)

前記式1で表されるピリチオン化合物としては、ピリチオン、ピリチオンナトリウム、亜鉛ピリチオン、銅ピリチオン等が挙げられる。好ましくは、ピリチオン、亜鉛ピリチオンである。これらの化合物は公知であり、また市販されているものを利用することもでき、例えばRutgers社から商業的に入手可能である。   Examples of the pyrithione compound represented by Formula 1 include pyrithione, sodium pyrithione, zinc pyrithione, and copper pyrithione. Preferred are pyrithione and zinc pyrithione. These compounds are known and commercially available ones can be used, for example, commercially available from Rutgers.

(充填剤)
本発明のゴム組成物は、上記シリカ以外に各種充填剤を配合することができる。充填剤としてはとくに制限されず、用途により適宜選択すればよいが、例えばカーボンブラック、無機充填剤等が挙げられる。無機充填剤としては、例えばクレー、タルク、炭酸カルシウム等を挙げることができる。中でもカーボンブラックが好ましい。
充填剤の配合割合は例えばジエン系ゴム100質量部に対し、5〜100質量部であるのが好ましく、5〜80質量部がさらに好ましい。
(filler)
The rubber composition of the present invention can contain various fillers in addition to the silica. The filler is not particularly limited and may be appropriately selected depending on the application. Examples thereof include carbon black and inorganic filler. Examples of the inorganic filler include clay, talc, and calcium carbonate. Of these, carbon black is preferred.
For example, the blending ratio of the filler is preferably 5 to 100 parts by mass, and more preferably 5 to 80 parts by mass with respect to 100 parts by mass of the diene rubber.

(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、BET比表面積155m/g以上のシリカを20〜120質量部配合およびシランカップリング剤をシリカに対して3〜15質量%配合し、さらに前記式1で表されるピリチオン化合物を0.2〜8.0質量部配合してなる。
前記シリカの配合割合が20質量部未満であると、添加量が少なすぎて本発明の効果を達成することができない。逆に120質量部を超えると、ムーニー粘度が増加し加工が困難となるため好ましくない。
シランカップリング剤の配合割合が3質量%未満であると、ムーニー粘度、ペイン効果が増加し、結果として転動抵抗の悪化(tanδ(60℃)増加)や、ウェットスキッドが低下するため好ましくなく、逆に15質量%を超えると、ペイン効果が増加するため好ましくない。
前記ピリチオン化合物の配合割合が0.2質量部未満であると、シリカの反応性、分散性が不十分となり、転がり抵抗性、湿潤路面での制駆動性および加工性の改善の度合いが低下する。ピリチオン化合物を8.0質量部超えて配合しても、湿潤路面での制駆動性および加工性がそれほど改善されない。
(Rubber composition ratio)
The rubber composition of the present invention contains 20 to 120 parts by mass of silica having a BET specific surface area of 155 m 2 / g or more and 3 to 15% by mass of silane coupling agent to silica with respect to 100 parts by mass of diene rubber. Further, 0.2 to 8.0 parts by mass of the pyrithione compound represented by Formula 1 is blended.
When the blending ratio of the silica is less than 20 parts by mass, the addition amount is too small to achieve the effect of the present invention. Conversely, if it exceeds 120 parts by mass, the Mooney viscosity increases and processing becomes difficult, which is not preferable.
When the blending ratio of the silane coupling agent is less than 3% by mass, the Mooney viscosity and the Payne effect are increased, and as a result, rolling resistance is deteriorated (tan δ (60 ° C. increase)) and wet skid is decreased. On the contrary, if it exceeds 15% by mass, the Payne effect increases, which is not preferable.
When the blending ratio of the pyrithione compound is less than 0.2 parts by mass, the reactivity and dispersibility of silica become insufficient, and the degree of improvement in rolling resistance, braking / driving on wet road surfaces, and workability decreases. . Even when the pyrithione compound is blended in an amount exceeding 8.0 parts by mass, the braking / driving performance and processability on a wet road surface are not so improved.

さらに好ましい前記シリカの配合割合は、ジエン系ゴム100質量部に対し、30〜110質量部である。
さらに好ましいシランカップリング剤の配合割合は、シリカに対し、4〜12質量%である。
さらに好ましいピリチオン化合物の配合割合は、ジエン系ゴム100質量部に対し、0.5〜5質量部である。
A more preferable mixing ratio of the silica is 30 to 110 parts by mass with respect to 100 parts by mass of the diene rubber.
Furthermore, the mixing | blending ratio of a preferable silane coupling agent is 4-12 mass% with respect to a silica.
A more preferable blending ratio of the pyrithione compound is 0.5 to 5 parts by mass with respect to 100 parts by mass of the diene rubber.

本発明のゴム組成物には、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、各種オイル、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。   In addition to the components described above, the rubber composition of the present invention is generally blended with a rubber composition such as a vulcanization or crosslinking agent, a vulcanization or crosslinking accelerator, various oils, an anti-aging agent, and a plasticizer. Various additives can be blended, and such additives can be kneaded by a general method to form a composition, which can be used for vulcanization or crosslinking. The blending amounts of these additives can be set to conventional general blending amounts as long as the object of the present invention is not violated.

本発明のゴム組成物の用途としては、ベルトコンベアー、ホース、タイヤ等が挙げられるが、とくにタイヤ用途が好ましく、とりわけトレッド用として好適に使用される。   Applications of the rubber composition of the present invention include belt conveyors, hoses, tires, and the like, but tire applications are particularly preferable, and they are particularly preferably used for treads.

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使用することができる。   The rubber composition of the present invention can be used to produce a pneumatic tire according to a conventional method for producing a pneumatic tire.

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。   EXAMPLES Hereinafter, although an Example and a comparative example further demonstrate this invention, this invention is not restrict | limited to the following example.

標準例1、実施例1〜8および比較例1〜14
サンプルの調製
表1および2に示す配合(質量部)において、加硫系(加硫促進剤、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、ミキサー外に放出させて室温冷却した。続いて、該組成物を同バンバリーミキサーに再度入れ、加硫系を加えて混練し、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℃で20分間プレス加硫して加硫ゴム試験片を調製した。得られた未加硫のゴム組成物および加硫ゴム試験片について以下に示す試験法で物性を測定した。
Standard Example 1, Examples 1-8 and Comparative Examples 1-14
Sample preparation In the formulation (parts by mass) shown in Tables 1 and 2, the components excluding the vulcanization system (vulcanization accelerator, sulfur) were kneaded with a 1.7 liter closed Banbury mixer for 5 minutes, and then outside the mixer. Release and cool to room temperature. Subsequently, the composition was put into the Banbury mixer again, and a vulcanization system was added and kneaded to obtain a rubber composition. Next, the obtained rubber composition was press vulcanized at 160 ° C. for 20 minutes in a predetermined mold to prepare a vulcanized rubber test piece. The physical properties of the obtained unvulcanized rubber composition and vulcanized rubber test piece were measured by the following test methods.

ムーニー粘度:JIS K6300に準拠し、100℃で大ロータを用いて測定した。
ペイン効果:αテクノロジー社製 RPA2000を用いて、歪剪断応力G′を測定した。上記で作製した未加硫のゴム組成物を用いて160℃、20分の加硫を行い、歪0.28%〜30.0%までのG′を測定し、その差(G′0.28MPa−G′30.0MPa)を求めた。標準例1の値を100とし、指数表示した。数値が小さい程、シリカの分散性が良好であることを示す。
Mooney viscosity: measured in accordance with JIS K6300 at 100 ° C. using a large rotor.
Payne effect: Strain shear stress G ′ was measured using RPA2000 manufactured by α Technology. Using the unvulcanized rubber composition produced above, vulcanization was carried out at 160 ° C. for 20 minutes, and G ′ was measured from a strain of 0.28% to 30.0%, and the difference (G′0.0. 28 MPa−G′30.0 MPa) was determined. The value of the standard example 1 was set to 100, and the index was displayed. It shows that the dispersibility of a silica is so favorable that a numerical value is small.

バウンドラバー:未加硫のゴム組成物約0.5gを金網カゴに入れ、300mlのトルエンに室温で72時間浸漬する。サンプルを取り出し、乾燥後、サンプルの質量を測定し、下記式でバウンドラバー量を算出した。
バウンドラバー量=(Wfg−Wf)/Wp
式中、Wfgはトルエン浸漬、乾燥後のサンプルの質量であり、Wfはトルエン浸漬前の未加硫ゴム中のフィラー質量であり、Wpはトルエン浸漬前の未加硫ゴム中のゴム成分の質量である。
標準例1の値を100とし、指数表示した。数値が大きい程、バウンドラバー量が多いことを示す。
Bound rubber: About 0.5 g of an unvulcanized rubber composition is placed in a wire mesh basket and immersed in 300 ml of toluene at room temperature for 72 hours. The sample was taken out and dried, then the mass of the sample was measured, and the bound rubber amount was calculated by the following formula.
Bound rubber amount = (Wfg−Wf) / Wp
In the formula, Wfg is the mass of the sample after toluene immersion and drying, Wf is the mass of the filler in the unvulcanized rubber before immersion in toluene, and Wp is the mass of the rubber component in the unvulcanized rubber before immersion in toluene. It is.
The value of the standard example 1 was set to 100, and the index was displayed. The larger the value, the greater the amount of bound rubber.

tanδ(60℃):(株)東洋精機製作所製、粘弾性スペクトロメーターを用いて、初期歪10%、振幅±2%、周波数20Hzで測定した。標準例1の値を100とし、指数表示した。数値が小さいほど、発熱性が小さく、転がり抵抗が低いことを示す。   tan δ (60 ° C.): Measured at an initial strain of 10%, an amplitude of ± 2%, and a frequency of 20 Hz using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho. The value of the standard example 1 was set to 100, and the index was displayed. It shows that exothermic property is small and rolling resistance is so low that a numerical value is small.

湿潤路面での制駆動性(ウェットスキッド):ブリティッシュスタンダードポータブルスキッドテスター(スタンレイ・ロンドン社製)を用いて、湿潤路面の条件下で、ASTM E−303−83の方法に準拠して測定した。標準例1の値を100とし、指数表示した。数値が大きい程、湿潤路面での制駆動性に優れることを意味する。
結果を表1および2に併せて示す。
Damping / driving performance on wet road surface (wet skid): Using a British standard portable skid tester (manufactured by Stanley London), measurement was performed according to the method of ASTM E-303-83 under wet road surface conditions. The value of the standard example 1 was set to 100, and the index was displayed. A larger value means better braking / driving performance on wet road surfaces.
The results are shown in Tables 1 and 2 together.

Figure 0005593669
Figure 0005593669

Figure 0005593669
Figure 0005593669

*1:SBR(ランクセス社製、VSL5025-HM-1)
*2:BR(日本ゼオン(株)製、Nipol 1220)
*3:シリカ1(Rhodia社製、Zeosil 1165MP。BET比表面積=160m/g)
*4:シリカ2(Rhodia社製、Zeosil 1115MP。BET比表面積=110m/g)
*5:カーボンブラック(東海カーボン(株)製、シーストKH)
*6:シランカップリング剤(エボニックデグッサジャパン(株)製、Si69、化合物名=ビス−トリエトキシシリルプロピルテトラスルフィド)
*7:ZnO(正同化学工業(株)製、酸化亜鉛3種)
*8:ステアリン酸(日油(株)製、ビーズステアリン酸)
*9:老化防止剤(フレキシス製、サントフレックス6PPD)
*10:化合物1(シグマアルドリッチ社製ピリチオン。前記式1においてnが1でありQがHで表される化合物。)
*11:化合物2(Rutgers社製亜鉛ピリチオン。前記式1においてnが2でありQがZnである化合物。)
*12:硫黄(細井化学工業(株)製、油処理硫黄)
*13:加硫促進剤1(大内新興化学工業(株)製、ノクセラーCZ)
*14:加硫促進剤2(住友化学(株)製、ソクシノールDG)
* 1: SBR (manufactured by LANXESS, VSL5025-HM-1)
* 2: BR (Nippon Zeon Corporation, Nipol 1220)
* 3: Silica 1 (manufactured by Rhodia, Zeosil 1165MP, BET specific surface area = 160 m 2 / g)
* 4: Silica 2 (manufactured by Rhodia, Zeosil 1115MP, BET specific surface area = 110 m 2 / g)
* 5: Carbon black (manufactured by Tokai Carbon Co., Ltd., Seast KH)
* 6: Silane coupling agent (Evonik Degussa Japan Co., Ltd., Si69, compound name = bis-triethoxysilylpropyl tetrasulfide)
* 7: ZnO (manufactured by Shodo Chemical Industry Co., Ltd., three types of zinc oxide)
* 8: Stearic acid (manufactured by NOF Corporation, bead stearic acid)
* 9: Anti-aging agent (manufactured by Flexis, Santoflex 6PPD)
* 10: Compound 1 (Pyrithione manufactured by Sigma-Aldrich. Compound in which n is 1 and Q is H in Formula 1)
* 11: Compound 2 (Rutgers Zinc pyrithione. Compound in which n is 2 and Q is Zn in Formula 1).
* 12: Sulfur (manufactured by Hosoi Chemical Co., Ltd., oil-treated sulfur)
* 13: Vulcanization accelerator 1 (Ouchi Shinsei Chemical Co., Ltd., Noxeller CZ)
* 14: Vulcanization accelerator 2 (manufactured by Sumitomo Chemical Co., Ltd., Soxinol DG)

上記の表1から明らかなように、実施例1〜8で調製されたゴム組成物は、ジエン系ゴムに特定の物性を有するシリカおよびシランカップリング剤を特定量配合し、かつ、特定のピリチオン化合物を配合しているので、従来の代表的な標準例に対し、シリカの反応性、分散性が改善され、低い転がり抵抗と湿潤路面での高い制駆動性とが両立され、また、加工性も向上している。
これに対し、比較例1は、ピリチオン化合物の配合割合が本発明で規定する下限未満であるので、シリカの反応性、分散性の改善が見られず、転がり抵抗性、湿潤路面での制駆動性、加工性が向上しない。
比較例2は、ピリチオン化合物の配合割合が本発明で規定する上限を超えているので、加工性が悪化し、湿潤路面での制駆動性が向上していない。
比較例3は、シリカのBET比表面積が本発明で規定する下限未満であるので、湿潤路面での制駆動性が向上していない。
比較例4は、シリカの配合割合が本発明で規定する上限を超えているので、加工性が悪化し、またシリカの反応性、分散性の改善が見られず、転がり抵抗性も悪化している。
比較例5は、シリカの配合割合が本発明で規定する下限未満であるので、湿潤路面での制駆動性が改善されない。
比較例6は、シランカップリング剤の配合割合が本発明で規定する上限を超えているので、シリカの反応性、分散性の改善が見られず、転がり抵抗性、湿潤路面での制駆動性が悪化している。
比較例7は、シランカップリング剤の配合割合が本発明で規定する下限未満であるので、加工性が悪化し、またシリカの反応性、分散性の改善が見られず、転がり抵抗性、湿潤路面での制駆動性が悪化している。
比較例8は、ピリチオン化合物の配合割合が本発明で規定する下限未満であるので、シリカの反応性、分散性の改善が見られず、転がり抵抗性、湿潤路面での制駆動性、加工性が向上しない。
比較例9は、ピリチオン化合物の配合割合が本発明で規定する上限を超えているので、加工性が悪化し、湿潤路面での制駆動性が向上していない。
比較例10は、シリカのBET比表面積が本発明で規定する下限未満であるので、湿潤路面での制駆動性が向上していない。
比較例11は、シリカの配合割合が本発明で規定する上限を超えているので、加工性が悪化し、またシリカの反応性、分散性の改善が見られず、転がり抵抗性も悪化している。
比較例12は、シリカの配合割合が本発明で規定する下限未満であるので、湿潤路面での制駆動性が改善されない。
比較例13は、シランカップリング剤の配合割合が本発明で規定する上限を超えているので、シリカの反応性、分散性の改善が見られず、転がり抵抗性、湿潤路面での制駆動性が悪化している。
比較例14は、シランカップリング剤の配合割合が本発明で規定する下限未満であるので、加工性が悪化し、またシリカの反応性、分散性の改善が見られず、転がり抵抗性、湿潤路面での制駆動性が悪化している。
As is clear from Table 1 above, the rubber compositions prepared in Examples 1 to 8 were formulated with specific amounts of silica and silane coupling agents having specific physical properties in the diene rubber, and specific pyrithione. Because it contains a compound, the reactivity and dispersibility of silica are improved compared to conventional typical standard examples, and both low rolling resistance and high braking / driving performance on wet road surfaces are compatible. Has also improved.
On the other hand, in Comparative Example 1, since the blending ratio of the pyrithione compound is less than the lower limit specified in the present invention, improvement in silica reactivity and dispersibility is not observed, rolling resistance, and braking / driving on a wet road surface. And processability are not improved.
In Comparative Example 2, since the blending ratio of the pyrithione compound exceeds the upper limit defined in the present invention, the workability is deteriorated and the braking / driving performance on a wet road surface is not improved.
In Comparative Example 3, since the BET specific surface area of silica is less than the lower limit specified in the present invention, braking / driving performance on a wet road surface is not improved.
In Comparative Example 4, since the blending ratio of silica exceeds the upper limit defined in the present invention, the workability is deteriorated, the silica reactivity and dispersibility are not improved, and the rolling resistance is also deteriorated. Yes.
In Comparative Example 5, since the blending ratio of silica is less than the lower limit specified in the present invention, braking / driving performance on a wet road surface is not improved.
In Comparative Example 6, since the blending ratio of the silane coupling agent exceeds the upper limit defined in the present invention, improvement in silica reactivity and dispersibility is not observed, rolling resistance, braking / driving performance on wet road surface Is getting worse.
In Comparative Example 7, since the blending ratio of the silane coupling agent is less than the lower limit specified in the present invention, the workability is deteriorated, the improvement of the reactivity and dispersibility of silica is not seen, the rolling resistance, the wetness The braking / driving performance on the road surface has deteriorated.
In Comparative Example 8, since the blending ratio of the pyrithione compound is less than the lower limit specified in the present invention, improvement in silica reactivity and dispersibility was not observed, rolling resistance, braking / driving performance on wet road surfaces, and workability. Does not improve.
In Comparative Example 9, since the blending ratio of the pyrithione compound exceeds the upper limit defined in the present invention, the workability is deteriorated and the braking / driving performance on a wet road surface is not improved.
In Comparative Example 10, since the BET specific surface area of silica is less than the lower limit specified in the present invention, braking / driving performance on a wet road surface is not improved.
In Comparative Example 11, since the blending ratio of silica exceeds the upper limit defined in the present invention, the workability is deteriorated, the improvement of the reactivity and dispersibility of silica is not observed, and the rolling resistance is also deteriorated. Yes.
In Comparative Example 12, since the blending ratio of silica is less than the lower limit specified in the present invention, braking / driving performance on a wet road surface is not improved.
In Comparative Example 13, since the blending ratio of the silane coupling agent exceeds the upper limit defined in the present invention, improvement in silica reactivity and dispersibility was not observed, rolling resistance, and braking / driving performance on wet road surfaces. Is getting worse.
In Comparative Example 14, since the blending ratio of the silane coupling agent is less than the lower limit specified in the present invention, the workability is deteriorated, and the improvement of the reactivity and dispersibility of silica is not observed, and the rolling resistance and the wetness are not observed. The braking / driving performance on the road surface has deteriorated.

1 ビード部
2 サイドウォール
3 トレッド
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
1 Bead part 2 Side wall 3 Tread 4 Carcass layer 5 Bead core 6 Bead filler 7 Belt layer

Claims (2)

ジエン系ゴム100質量部に対し、BET比表面積が155〜220gのシリカを20〜120質量部、シランカップリング剤を前記シリカに対して3〜15質量%配合し、さらに下記式1で表されるピリチオン化合物を0.2〜8.0質量部配合してなることを特徴とするゴム組成物。
Figure 0005593669
(式1中、nは1または2を表す。nが1のとき、Qは水素原子またはNaを表す。nが2のとき、QはZn、CuまたはCaを表す)
20 to 120 parts by mass of silica having a BET specific surface area of 155 to 220 m 2 / g and 3 to 15% by mass of a silane coupling agent with respect to the silica are added to 100 parts by mass of the diene rubber. A rubber composition comprising 0.2 to 8.0 parts by mass of a pyrithione compound represented by 1.
Figure 0005593669
(In formula 1, n represents 1 or 2. When n is 1, Q represents a hydrogen atom or Na. When n is 2, Q represents Zn, Cu, or Ca.)
請求項1に記載のゴム組成物を使用した空気入りタイヤ。   A pneumatic tire using the rubber composition according to claim 1.
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