JP4113878B2 - Rubber composition and pneumatic tire comprising the same - Google Patents
Rubber composition and pneumatic tire comprising the same Download PDFInfo
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Description
本発明は、ゴム組成物およびそれからなる空気入りタイヤに関し、詳細には加工性および低温における硬度が改善されたゴム組成物、ならびに氷雪路面での摩擦性能を低下させることなく、耐摩耗性を向上させた空気入りタイヤに関する。 The present invention relates to a rubber composition and a pneumatic tire comprising the same, and more particularly, a rubber composition having improved processability and hardness at low temperatures, and improved wear resistance without deteriorating frictional performance on icy and snowy road surfaces. Relates to a pneumatic tire.
氷雪路面走行を目的として、スパイクタイヤの使用やタイヤへのチェーンの装着がされてきたが、粉塵問題などの環境問題が発生するため、これにかわる氷雪路面走行用タイヤとしてスタッドレスタイヤが開発された。スタッドレスタイヤは、氷雪路面では一般路面に比べ、著しく摩擦係数が低下し滑りやすくなるので、材料面および設計面での工夫がされている。 Spike tires have been used and chains attached to tires for the purpose of running on snowy and snowy roads, but environmental problems such as dust problems have occurred, so studless tires have been developed as tires for running on snowy and snowy roads. . Studless tires are devised in terms of material and design because the friction coefficient is significantly reduced on icy and snowy road surfaces and the friction coefficient is significantly reduced compared to general road surfaces.
氷雪路面における摩擦性能を向上させるため、例えば、ゴムを低硬度にする手法がとられている。ゴムを低硬度にする手法としては、充填剤や硫黄の配合量を少なくしたり、オイルなどの軟化剤を多量に配合することなどが挙げられる。しかし、いずれの方法でも、氷雪路面での摩擦性能と耐摩耗性との両立が困難であった。 In order to improve the friction performance on an icy and snowy road surface, for example, a technique of reducing the hardness of rubber is taken. As a technique for reducing the hardness of the rubber, there may be mentioned reducing the amount of filler and sulfur, or adding a large amount of softener such as oil. However, in either method, it is difficult to achieve both friction performance and wear resistance on an icy and snowy road surface.
また、近年では、充填剤としてシリカを配合したタイヤが主流となってきているが、シリカを多量に配合し、そのほかの充填剤を減量するとゴムの加工性が悪化するという問題があった。 In recent years, tires containing silica as a filler have become mainstream, but there is a problem that rubber workability deteriorates when a large amount of silica is added and the amount of other fillers is reduced.
本発明は、加工性および低温における硬度が改善されたゴム組成物、ならびに氷雪路面での摩擦性能を低下させることなく、耐摩耗性を向上させた空気入りタイヤを提供することを目的とする。 An object of the present invention is to provide a rubber composition having improved processability and hardness at low temperature, and a pneumatic tire having improved wear resistance without reducing the frictional performance on icy and snowy road surfaces.
本発明は、ポリブタジエンゴムを５０重量％以上含むジエン系ゴム１００重量部に対して、シリカを１０〜５０重量部含有し、カーボンブラックを１０〜５０重量部含有し、前記シリカおよびカーボンブラックの合計含有量が４０〜６０重量部、およびエポキシ化液状ポリイソプレンゴムを１５〜２５重量部含有するゴム組成物に関する。 The present invention is, with respect to the diene rubber 100 parts by weight comprising a polybutadiene rubber 50 wt% or more, the silica contains 10 to 50 parts by weight, of carbon black containing 10 to 50 parts by weight, the sum of the silica and carbon black The present invention relates to a rubber composition containing 40 to 60 parts by weight and 15 to 25 parts by weight of epoxidized liquid polyisoprene rubber.
前記ゴム組成物は、さらに、硫黄を１．０〜１．５重量部含有することが好ましい。 It is preferable that the rubber composition further contains 1.0 to 1.5 parts by weight of sulfur.
また、本発明は、前記ゴム組成物からなるキャップトレッド部を有する空気入りタイヤに関する。 The present invention also relates to a pneumatic tire having a cap tread portion made of the rubber composition.
本発明によれば、低温特性および耐摩耗性に優れるポリブタジエンゴムを含むジエン系ゴム、カーボンブラックおよびシリカを特定量配合し、さらに軟化剤としてエポキシ化液状ポリイソプレンゴムを配合することにより、加工性および低温における硬度が改善されたゴム組成物、ならびに該ゴム組成物からなるキャップトレッド部を有することで、氷雪路面での摩擦性能を低下させることなく、耐摩耗性を向上させた空気入りタイヤを提供する。 According to the present invention, a specific amount of a diene rubber containing a polybutadiene rubber excellent in low temperature characteristics and wear resistance, carbon black and silica is blended, and further, an epoxidized liquid polyisoprene rubber is blended as a softening agent. A pneumatic tire having improved wear resistance without lowering frictional performance on snowy and snowy road surfaces by having a rubber composition with improved hardness at low temperature and a cap tread portion comprising the rubber composition provide.
本発明は、ジエン系ゴム、シリカ、カーボンブラックおよびエポキシ化した液状ポリイソプレンゴムからなる。 The present invention comprises diene rubber, silica, carbon black, and epoxidized liquid polyisoprene rubber.
ジエン系ゴムはポリブタジエンゴム（ＢＲ）を含有する。ジエン系ゴム中におけるＢＲの含有率は５０重量％以上である。ＢＲの含有率が５０重量％未満では、低温における特性および耐摩耗性に対する効果が充分に得られない。また、ゴム成分中におけるＢＲの含有率は８０重量％以下であることが好ましい。ＢＲの含有率が８０重量％をこえると、加工性に劣る傾向がある。 The diene rubber contains polybutadiene rubber (BR). The content of BR in the diene rubber is 50% by weight or more. When the BR content is less than 50% by weight, the effect on the properties at low temperatures and the wear resistance cannot be sufficiently obtained. Moreover, it is preferable that the content rate of BR in a rubber component is 80 weight% or less. If the BR content exceeds 80% by weight, the processability tends to be inferior.
ＢＲと併用されるジエン系ゴムとしては、天然ゴム（ＮＲ）、スチレン−ブタジエンゴム（ＳＢＲ）、イソプレンゴム（ＩＲ）、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）などが挙げられる。なかでも、ＮＲが好ましい。 Examples of the diene rubber used in combination with BR include natural rubber (NR), styrene-butadiene rubber (SBR), isoprene rubber (IR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), and the like. Of these, NR is preferable.
シリカとしては、とくに制限はなく、湿式法または乾式法により調製されたものを用いることができる。 Silica is not particularly limited, and silica prepared by a wet method or a dry method can be used.
シリカの含有量は、ジエン系ゴム１００重量部に対して１０〜５０重量部であることが好ましい。シリカの含有量が１０重量部未満では、氷上性能に劣る傾向がある。また、シリカの含有量が５０重量部をこえると、加工性に劣る傾向がある。 The content of silica is preferably 10 to 50 parts by weight with respect to 100 parts by weight of the diene rubber. When the silica content is less than 10 parts by weight, the performance on ice tends to be inferior. Moreover, when the content of silica exceeds 50 parts by weight, the workability tends to be inferior.
カーボンブラックとしては、ＳＡＦ、ＩＳＡＦ、ＨＡＦ、ＦＥＦなどが挙げられるが、なかでもＳＡＦが好ましい。 Examples of carbon black include SAF, ISAF, HAF, and FEF. Among them, SAF is preferable.
カーボンブラックの含有量は、ジエン系ゴム１００重量部に対して１０〜５０重量部であることが好ましい。カーボンブラックの含有量が１０重量部未満では、耐摩耗性に劣る傾向がある。また、カーボンブラックの含有量が５０重量部をこえると、ゴム組成物の硬度が増大する傾向がある。 The content of carbon black is preferably 10 to 50 parts by weight with respect to 100 parts by weight of the diene rubber. If the carbon black content is less than 10 parts by weight, the wear resistance tends to be inferior. Moreover, when the content of carbon black exceeds 50 parts by weight, the hardness of the rubber composition tends to increase.
シリカおよびカーボンブラックの合計含有量は、ジエン系ゴム１００重量部に対して４０重量部以上、好ましくは４５重量部以上である。合計含有量が４０重量部未満では、耐摩耗性が低い。また、シリカおよびカーボンブラックの合計含有量は６０重量部以下、好ましくは５５重量部以下である。合計含有量が６０重量部をこえると、得られたゴム組成物の硬度が増大し、氷雪路表面の凹凸に対するゴムの追従性が悪くなるため、耐摩耗性が低下する。 The total content of silica and carbon black is 40 parts by weight or more, preferably 45 parts by weight or more with respect to 100 parts by weight of the diene rubber. When the total content is less than 40 parts by weight, the wear resistance is low. The total content of silica and carbon black is 60 parts by weight or less, preferably 55 parts by weight or less. When the total content exceeds 60 parts by weight, the hardness of the obtained rubber composition increases, and the followability of the rubber to the irregularities on the surface of the icy and snowy road deteriorates, so that the wear resistance decreases.
本発明のゴム組成物において、エポキシ化液状ポリイソプレンゴムは軟化剤として用いられる。ゴム組成物中において、エポキシ化していない未変性の液状ポリイソプレンゴムとシリカの分散体は一般的にセメント状であるが、本発明のように、ゴム組成物に対して、エポキシ化した液状ポリイソプレンゴムをシリカと併用することにより、それらの分散体は高い流動性を有し、エポキシ化によりシリカとの相互作用が向上する効果があるため、加工性が良好なゴム組成物を得ることができる。 In the rubber composition of the present invention, the epoxidized liquid polyisoprene rubber is used as a softening agent. In a rubber composition, a dispersion of unmodified liquid polyisoprene rubber and silica that is not epoxidized is generally cement-like. However, as in the present invention, an epoxidized liquid polyisoprene rubber is added to the rubber composition. By using isoprene rubber together with silica, these dispersions have high fluidity, and the effect of improving the interaction with silica by epoxidation can be obtained, so that a rubber composition having good processability can be obtained. it can.
エポキシ化液状ポリイソプレンゴムの含有量は、ジエン系ゴム１００重量部に対して１５重量部以上、好ましくは１８重量部以上である。含有量が１５重量部未満では、ゴム組成物の硬度が過剰に増大するため耐摩耗性が低下する。また、エポキシ化液状ポリイソプレンゴムの含有量は２５重量部以下、好ましくは２２重量部以下である。含有量が２５重量部をこえると、ゴム組成物の強度が低下し、耐摩耗性などの耐久性が低下する。 The content of the epoxidized liquid polyisoprene rubber is 15 parts by weight or more, preferably 18 parts by weight or more with respect to 100 parts by weight of the diene rubber. When the content is less than 15 parts by weight, the hardness of the rubber composition is excessively increased, so that the wear resistance is lowered. The content of the epoxidized liquid polyisoprene rubber is 25 parts by weight or less, preferably 22 parts by weight or less. When content exceeds 25 weight part, the intensity | strength of a rubber composition will fall and durability, such as abrasion resistance, will fall.
本発明のゴム組成物には、さらに、前記成分のほかにタイヤゴム工業で通常使用されている各種薬品、たとえば、硫黄などの加硫剤、各種加硫促進剤、各種軟化剤、各種老化防止剤、ステアリン酸、酸化亜鉛、酸化防止剤、オゾン劣化防止剤などの添加剤を配合することができる。 In addition to the above components, the rubber composition of the present invention further includes various chemicals commonly used in the tire rubber industry, such as vulcanizing agents such as sulfur, various vulcanization accelerators, various softening agents, and various anti-aging agents. , Additives such as stearic acid, zinc oxide, antioxidants, ozone deterioration inhibitors can be blended.
加硫剤として硫黄を使用する場合、硫黄の配合量は、ジエン系ゴム１００重量部に対して１．０〜１．５重量部であることが好ましい。硫黄の配合量が１．０重量部未満では、ゴム組成物の強度が低く、耐摩耗性などの耐久性が低下する傾向がある。また、硫黄の配合量が１．５重量部をこえると、ゴムの硬度が過剰に増大し、氷雪路表面の凹凸に対するゴムの追従性が低下するため、耐摩耗性が低下する傾向がある。さらに、長期間の走行によって、硫黄が再架橋することでゴムの硬度が過度に上昇するため、硫黄の量を１．５重量部をこえて配合することは好ましくない。 When sulfur is used as the vulcanizing agent, the amount of sulfur is preferably 1.0 to 1.5 parts by weight with respect to 100 parts by weight of the diene rubber. If the amount of sulfur is less than 1.0 part by weight, the strength of the rubber composition tends to be low, and durability such as wear resistance tends to decrease. On the other hand, when the amount of sulfur exceeds 1.5 parts by weight, the hardness of the rubber is excessively increased, and the followability of the rubber to the unevenness on the surface of the snowy and snowy road is lowered, so that the wear resistance tends to be lowered. Furthermore, since the hardness of the rubber is excessively increased due to re-crosslinking of sulfur by running for a long time, it is not preferable to blend the amount of sulfur beyond 1.5 parts by weight.
０℃における本発明のゴム組成物の硬度は４０〜５０であることが好ましい。硬度が４０未満では、ゴム組成物の強度が低く、耐摩耗性などの耐久性が低下する傾向がある。また、硬度が５０をこえると、氷雪路表面の凹凸に対するゴムの追従性が低下するため、耐摩耗性が低下する傾向がある。 The hardness of the rubber composition of the present invention at 0 ° C. is preferably 40-50. If the hardness is less than 40, the strength of the rubber composition tends to be low, and durability such as wear resistance tends to decrease. On the other hand, when the hardness exceeds 50, the followability of the rubber to the irregularities on the surface of the icy and snowy road is lowered, so that the wear resistance tends to be lowered.
本発明の空気入りタイヤは、氷雪路表面において必要とされる特性を満足することが可能であるため、とくにスタッドレスタイヤとすることが好ましい。 Since the pneumatic tire of the present invention can satisfy the characteristics required on the surface of icy and snowy roads, a studless tire is particularly preferable.
本発明の空気入りタイヤにおけるトレッド部は、キャップトレッド部およびベーストレッド部の２層構造からなり、該キャップトレッド部が本発明のゴム組成物からなることが好ましい。本発明のゴム組成物をキャップトレッド部に用いることで氷雪路面における摩擦性能が大幅低下することなく、さらに耐摩耗性が良好な空気入りタイヤを提供できる。 The tread portion in the pneumatic tire of the present invention has a two-layer structure of a cap tread portion and a base tread portion, and the cap tread portion is preferably made of the rubber composition of the present invention. By using the rubber composition of the present invention for the cap tread portion, it is possible to provide a pneumatic tire with better wear resistance without significantly reducing the frictional performance on the icy and snowy road surface.
本発明の空気入りタイヤは、前記ジエン系ゴム、シリカ、カーボンブラック、エポキシ化液状ポリイソプレン、ならびに任意成分をミキサーまたはロールなどにより混練りして、得られた混練り物をタイヤ成型機上にてキャップトレッド部の形状とし、それを他のタイヤ部材と貼り合わせて加熱加圧することにより製造されることが好ましい。 In the pneumatic tire of the present invention, the diene rubber, silica, carbon black, epoxidized liquid polyisoprene, and optional components are kneaded with a mixer or a roll, and the obtained kneaded product is put on a tire molding machine. It is preferable that the cap tread portion is formed in a shape, which is bonded to another tire member and heated and pressed.
実施例にもとづいて本発明を詳細に説明するが、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 described in detail based on examples, but the present invention is not limited to these examples.
実施例１〜３および比較例１〜５
実施例１〜３および比較例１〜５において用いた各種薬品を以下に示す。
ＮＲ：ＲＳＳ＃３
ＢＲ：宇部興産（株）製のＵＢＥＰＯＬ−ＢＲ１０５Ｂ（シス−１，４結合含量：９６％）
カーボンブラック：東海カーボン（株）製のシースト９（ＳＡＦ）
シリカ：デグサ製のウルトラシルＶＮ３
シランカップリング剤：デグサ製のＳｉ６９
オイル：出光興産（株）製のダイナプロセスオイルＰＷ３２
液状ポリイソプレンゴム：（株）クラレ製のエポキシ化液状ポリイソプレンＫＬ６１０（エポキシ化率：３．３モル％、重量平均分子量：２．９×１０5）
ワックス：大内新興化学工業（株）製のサンノックワックス
老化防止剤：大内新興化学工業（株）製のノクラック６Ｃ（Ｎ−１，３−ジメチルブチル−Ｎ’−フェニル−ｐ−フェニレンジアミン）
ステアリン酸：日本油脂（株）製のステアリン酸
亜鉛華：三井金属鉱業（株）製の亜鉛華１号
硫黄：鶴見化学（株）製の粉末硫黄
加硫促進剤：大内新興化学工業（株）製のノクセラーＣＺ（N-cyclohexyl-2-benzothiazyl-sulfenamide）
Examples 1-3 and Comparative Examples 1-5
Various chemicals used in Examples 1 to 3 and Comparative Examples 1 to 5 are shown below.
NR: RSS # 3
BR: UBEPOL-BR105B manufactured by Ube Industries, Ltd. (cis-1,4 bond content: 96%)
Carbon black: Seast 9 (SAF) manufactured by Tokai Carbon Co., Ltd.
Silica: Degussa Ultrasil VN3
Silane coupling agent: Si69 made by Degussa
Oil: Dyna Process Oil PW32 manufactured by Idemitsu Kosan Co., Ltd.
Liquid polyisoprene rubber: Epoxidized liquid polyisoprene KL610 manufactured by Kuraray Co., Ltd. (epoxidation rate: 3.3 mol%, weight average molecular weight: 2.9 × 10 5 )
Wax: Sunnock wax anti-aging agent manufactured by Ouchi Shinsei Chemical Industry Co., Ltd .: NOCRACK 6C (N-1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine) manufactured by Ouchi Shin Chemical Co., Ltd. )
Stearic acid: Zinc stearate manufactured by Nippon Oil & Fats Co., Ltd .: Zinc flower No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd. Sulfur: Powder sulfur vulcanization accelerator manufactured by Tsurumi Chemical Co., Ltd .: Ouchi Shinsei Chemical Industry Co., Ltd. ) Noxeller CZ (N-cyclohexyl-2-benzothiazyl-sulfenamide)
＜試験方法＞
（ゴム硬度）
実施例および比較例の配合内容にしたがって、混練りおよび加熱加硫して試験片を作製した。ＪＩＳ−Ａ硬度計を用い、作製した試験片の硬度を０℃の条件において測定した。
<Test method>
(Rubber hardness)
Test pieces were prepared by kneading and heating vulcanization according to the blending contents of the examples and comparative examples. Using a JIS-A hardness meter, the hardness of the produced test piece was measured under the condition of 0 ° C.
（加工性）
実施例および比較例の配合内容にしたがい混練りしたゴムを、表面温度７０℃のロールにより３ｍｍの厚さにシート出しした後のゴム生地（ゴム表面の凹凸）を目視によって「◎：非常に良好、○：良好、△：普通、×：悪い」の４段階で評価した。
(Processability)
The rubber fabric (unevenness on the rubber surface) after the rubber kneaded according to the contents of the examples and comparative examples was sheeted to a thickness of 3 mm by a roll having a surface temperature of 70 ° C. was visually evaluated as “「: very good. , ○: good, Δ: normal, ×: bad ”.
また、実施例１〜３および比較例１〜５の配合内容により得られたゴム組成物からなるキャップトレッド部を有する１９５／６５Ｒ１５サイズのタイヤを作製し、以下の試験に用いた。 Moreover, a 195 / 65R15 size tire having a cap tread portion made of a rubber composition obtained according to the contents of Examples 1 to 3 and Comparative Examples 1 to 5 was produced and used for the following tests.
（氷上性能）
前記タイヤを排気量２０００ｃｃの国産ＦＲ車に装着して実車走行をおこない、時速３０ｋｍ／ｈからの氷盤上での制動停止距離を求めた。比較例１の値を１００としてそれぞれ指数で示した。指数が大きいほど氷上性能に優れ、摩擦性能に優れることを示す。
(Performance on ice)
The tire was mounted on a 2000 cc domestic FR vehicle and the vehicle was run, and the braking stop distance on the ice board from 30 km / h was determined. The value of Comparative Example 1 is taken as 100, and each is shown as an index. The larger the index, the better the performance on ice and the better the friction performance.
（耐摩耗性）
前記タイヤを排気量２０００ｃｃの国産ＦＲ車に装着して実車走行をおこない、３０，０００ｋｍ走行後の摩耗量を測定した。比較例１の値を１００として指数で示した。指数が大きいほど耐摩耗性に優れている。
(Abrasion resistance)
The tire was mounted on a 2000 cc domestic FR vehicle and the vehicle was run, and the amount of wear after running 30,000 km was measured. The value of Comparative Example 1 was taken as 100 and indicated as an index. The higher the index, the better the wear resistance.
測定結果を表１に示す。 The measurement results are shown in Table 1.
Claims (1)
シリカを１０〜５０重量部含有し、
カーボンブラックを１０〜５０重量部含有し、
前記シリカおよびカーボンブラックの合計含有量が４０〜６０重量部であり、
エポキシ化液状ポリイソプレンゴムを１５〜２５重量部含有し、および
硫黄を１．０〜１．５重量部含有
するゴム組成物からなるキャップトレッド部を有するスタッドレスタイヤ。 For 100 parts by weight of diene rubber containing 50% by weight or more of polybutadiene rubber,
Containing 10 to 50 parts by weight of silica,
Containing 10 to 50 parts by weight of carbon black,
The total amount of the silica and carbon black is 40 to 60 parts by weight,
Contains 15 to 25 parts by weight of epoxidized liquid polyisoprene rubber , and
A studless tire having a cap tread portion made of a rubber composition containing 1.0 to 1.5 parts by weight of sulfur .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005011620A JP4113878B2 (en) | 2005-01-19 | 2005-01-19 | Rubber composition and pneumatic tire comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005011620A JP4113878B2 (en) | 2005-01-19 | 2005-01-19 | Rubber composition and pneumatic tire comprising the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2006199785A JP2006199785A (en) | 2006-08-03 |
| JP4113878B2 true JP4113878B2 (en) | 2008-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2005011620A Expired - Fee Related JP4113878B2 (en) | 2005-01-19 | 2005-01-19 | Rubber composition and pneumatic tire comprising the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4113878B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06180172A (en) * | 1992-12-08 | 1994-06-28 | Okamura Corp | Show case |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5073583B2 (en) | 2007-09-05 | 2012-11-14 | 住友ゴム工業株式会社 | Rubber composition for studless tire and studless tire using the same |
| JP5524555B2 (en) * | 2009-09-25 | 2014-06-18 | 住友ゴム工業株式会社 | Rubber composition for tread and studless tire |
-
2005
- 2005-01-19 JP JP2005011620A patent/JP4113878B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06180172A (en) * | 1992-12-08 | 1994-06-28 | Okamura Corp | Show case |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006199785A (en) | 2006-08-03 |
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