JP2007302052A - Studless tire - Google Patents
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Abstract
Description
本発明は、スタッドレスタイヤに関する。 The present invention relates to a studless tire.
近年、氷雪路を走行するタイヤとして、スパイクのないスタッドレスタイヤが普及している。このスタッドレスタイヤは、氷上性能を向上させるために、路面掘り起こし摩擦や粘着摩擦を増加させる必要があり、トレッド用ゴム組成物の氷路面に対する摩擦係数を上げるための種々の研究が試みられている。 In recent years, studless tires without spikes have become widespread as tires that run on icy and snowy roads. In order to improve the performance on ice, the studless tire needs to increase road surface digging friction and adhesion friction, and various studies for increasing the friction coefficient of the tread rubber composition with respect to the ice road surface have been attempted.
一方で、タイヤの強度、剛性、耐摩耗性などを向上させるため、短繊維を配合したゴム組成物をタイヤのトレッド部に使用する技術が知られている。しかしながら、短繊維を配合した未加硫ゴム組成物をカレンダーロールや押出し機によって押出し成形すると、配合された短繊維は、押出し方向、すなわちタイヤの周方向に沿って配向する。そのため、タイヤの強度、剛性および耐摩耗性などは向上させることができたものの、短繊維による引掻き効果（掘り起こし摩擦）を得ることはできなかった。 On the other hand, in order to improve the strength, rigidity, wear resistance, etc. of a tire, a technique is known in which a rubber composition containing short fibers is used for a tread portion of a tire. However, when an unvulcanized rubber composition blended with short fibers is extruded by a calender roll or an extruder, the blended short fibers are oriented along the extrusion direction, that is, the circumferential direction of the tire. Therefore, although the strength, rigidity, wear resistance and the like of the tire could be improved, the scratching effect (digging friction) by the short fiber could not be obtained.
さらに、棒状の粒子形状を有する、粉体または短繊維を、トレッドの周方向ではなく厚さ方向に配向させたスタッドレスタイヤが知られている。ここで、粉体または短繊維として、金属のような硬い材料を配合した場合には、ゴム組成物の硬度が上がり、粘着摩擦力が低下する。加えて、ゴムと金属とでは耐摩耗性が大幅に異なるため、ゴムが金属より速いペースで摩耗し、突出した金属短繊維が路面とゴムとの接触を妨げ、接触面積が低下する。これにより、粘着、凝着摩擦力の減少を引き起こし、氷雪上性能が劣ることになる。 Furthermore, a studless tire is known in which powders or short fibers having a rod-like particle shape are oriented in the thickness direction rather than in the circumferential direction of the tread. Here, when a hard material such as a metal is blended as the powder or short fiber, the hardness of the rubber composition increases and the adhesive frictional force decreases. In addition, since the wear resistance is significantly different between rubber and metal, the rubber wears at a faster pace than the metal, and the protruding short metal fibers hinder the contact between the road surface and the rubber, thereby reducing the contact area. This causes a decrease in adhesion and adhesion frictional force, resulting in poor performance on ice and snow.
また、短繊維がトレッドの厚さ方向に配向されたトレッドを得る技術として、短繊維が押出し機の押出し方向に配向された未加硫ゴムシートを作製し、さらに、この未加硫ゴムシートを短繊維の配向方向に対して垂直方向に細かい間隔でカットして、それぞれを９０度回転させて重ね合わせることにより、短繊維がゴムシート面に対して垂直に配向したゴムシートが得られる。このようなゴムシートを使用して、トレッドを作製することにより、短繊維の引っ掻き効果（掘り起こし摩擦）を得る方法が知られている。 As a technique for obtaining a tread in which short fibers are oriented in the thickness direction of the tread, an unvulcanized rubber sheet in which short fibers are oriented in the extrusion direction of the extruder is produced. A rubber sheet in which the short fibers are oriented perpendicularly to the rubber sheet surface is obtained by cutting at fine intervals in the direction perpendicular to the orientation direction of the short fibers and rotating each of them 90 degrees to overlap each other. There is known a method of obtaining a short fiber scratching effect (digging friction) by producing a tread using such a rubber sheet.
しかしながら、上述したような、トレッドの厚さ方向に配向された短繊維の材料としては、単なるガラス短繊維やカーボンファイバーを用いており、氷雪上性能の改善効果は不充分である。 However, as the short fiber material oriented in the thickness direction of the tread as described above, simple glass short fibers or carbon fibers are used, and the effect of improving the performance on ice and snow is insufficient.
また、特許文献１では、タイヤ用ゴム組成物に、直径と長さの比が所定の値を有する太径有機繊維のモノフィラメントチップを所定量含有することにより、トレッド部の引っ掻き効果を高めたスタッドレスタイヤが開示されている。この技術では、押出し工程において、短繊維がタイヤの周方向に配向し難くなるため、タイヤ周方向に配向する従来のものに比べて、短繊維の端部が路面と接触する機会が増え、引っ掻き効果はある程度向上する。しかしながら、充分に満足し得る氷上性能を得るには、いまだ改善の余地がある。 Further, in Patent Document 1, the tireless rubber composition for tires includes a predetermined amount of a monofilament chip of a large diameter organic fiber having a predetermined ratio of diameter to length, thereby increasing the scratching effect of the tread portion. A tire is disclosed. In this technique, since the short fibers are less likely to be oriented in the circumferential direction of the tire in the extrusion process, the chance of the ends of the short fibers being in contact with the road surface is increased and scratched compared to conventional ones oriented in the circumferential direction of the tire. The effect is improved to some extent. However, there is still room for improvement in order to obtain fully satisfactory performance on ice.
本発明は、掘り起こし摩擦を向上させ、氷雪上性能に優れたスタッドレスタイヤを提供することを目的としている。 An object of the present invention is to provide a studless tire which improves excavation friction and has excellent performance on ice and snow.
本発明は、ジエン系ゴム成分および中空ガラス短繊維を含有するゴム組成物を用いたトレッドを有し、該中空ガラス短繊維を該トレッドの厚さ方向に配向しているスタッドレスタイヤに関する。 The present invention relates to a studless tire having a tread using a rubber composition containing a diene rubber component and hollow glass short fibers, and orienting the hollow glass short fibers in the thickness direction of the tread.
前記中空ガラス短繊維の平均繊維外径が１５０〜１０００μｍであり、平均繊維長が０．１〜５ｍｍであることが好ましい。 The hollow fiber short fibers preferably have an average fiber outer diameter of 150 to 1000 μm and an average fiber length of 0.1 to 5 mm.
トレッド部から切り出したゴム片の、２５℃で測定したトレッドの厚さ方向の複素弾性率Ｅ１とタイヤ周方向の複素弾性率Ｅ２の比が、式：
１．１≦Ｅ１／Ｅ２≦４
を満足することが好ましい。
The ratio of the complex elastic modulus E1 in the thickness direction of the tread measured at 25 ° C. to the complex elastic modulus E2 in the tire circumferential direction of the rubber piece cut out from the tread portion is expressed by the formula:
1.1 ≦ E1 / E2 ≦ 4
Is preferably satisfied.
本発明によれば、ジエン系ゴム成分および中空ガラス短繊維を含有するゴム組成物を用いたトレッドを有し、該中空ガラス短繊維を該トレッドの厚さ方向に配向していることにより、掘り起こし摩擦を向上させ、氷雪上性能に優れたスタッドレスタイヤを提供することができる。 According to the present invention, a tread using a rubber composition containing a diene rubber component and a short hollow glass fiber is provided, and the hollow glass short fiber is oriented in the thickness direction of the tread. It is possible to provide a studless tire with improved friction and excellent performance on ice and snow.
本発明のスタッドレスタイヤに用いられるゴム組成物は、ジエン系ゴム成分および中空ガラス短繊維を含有する。 The rubber composition used for the studless tire of the present invention contains a diene rubber component and short glass short fibers.
ジエン系ゴム成分としては、任意のジエン系ゴムが用いられ、たとえば天然ゴム（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ゴム（ＳＢＲ）、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）などがあげられる。なかでも、耐摩耗性および低温特性に優れるという理由から、ＮＲおよび／またはＢＲが好ましく、ＮＲおよびＢＲがより好ましい。 As the diene rubber component, any diene rubber is used. For example, natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), chloroprene. Examples include rubber (CR). Among these, NR and / or BR are preferable and NR and BR are more preferable because of excellent wear resistance and low temperature characteristics.
ＮＲとしては、従来ゴム工業で使用されるＲＳＳ♯３、ＴＳＲ２０などのグレードのＮＲを用いることができる。 As NR, grade NR such as RSS # 3, TSR20 and the like conventionally used in the rubber industry can be used.
ゴム成分中にＮＲを含有する場合、ＮＲの含有率は１０重量％以上が好ましく、２０重量％以上がより好ましい。ＮＲの含有率が１０重量％未満では、ゴム練り時のまとまりが悪く、加工性が劣る傾向がある。また、ＮＲの含有率は９０重量％以下が好ましく、８０重量％以下がより好ましい。ＮＲの含有率が９０重量％をこえると、低温特性が低下する傾向がある。 When the rubber component contains NR, the content of NR is preferably 10% by weight or more, and more preferably 20% by weight or more. When the content of NR is less than 10% by weight, the unity at the time of rubber kneading is poor and the processability tends to be inferior. The NR content is preferably 90% by weight or less, and more preferably 80% by weight or less. When the content of NR exceeds 90% by weight, the low-temperature characteristics tend to deteriorate.
ＢＲとしては、ＢＲ１５０Ｂ（宇部興産（株）製）、ＢＲ０１（ＪＳＲ（株））などのゴム工業において一般的なものを使用することができる。 As the BR, those commonly used in the rubber industry such as BR150B (manufactured by Ube Industries, Ltd.) and BR01 (JSR Corporation) can be used.
ゴム成分中にＢＲを含有する場合、ＢＲの含有率は１０重量％以上が好ましく、２０重量％以上がより好ましい。ＢＲの含有率が１０重量％未満では、低温特性が低下する傾向がある。また、ＢＲの含有率は９０重量％以下が好ましく、８０重量％以下がより好ましい。ＢＲの含有率が９０重量％をこえると、ゴム練り時のまとまりが悪く、加工性が劣る傾向がある。 When the rubber component contains BR, the BR content is preferably 10% by weight or more, and more preferably 20% by weight or more. If the BR content is less than 10% by weight, the low-temperature characteristics tend to deteriorate. The BR content is preferably 90% by weight or less, more preferably 80% by weight or less. When the BR content exceeds 90% by weight, the unity during rubber kneading tends to be poor and the processability tends to be poor.
中空ガラス短繊維の平均繊維外径は１５０μｍ以上が好ましく、２００μｍ以上がより好ましい。中空ガラス短繊維の平均繊維外径が１５０μｍ未満では、繊維の耐屈曲性が不充分であり、路面引っ掻き効果（掘り起こし摩擦）が不充分になる傾向がある。また、中空ガラス短繊維の平均繊維外径は１０００μｍ以下が好ましく、５００μｍ以下がより好ましい。中空ガラス短繊維の平均繊維外径が１０００μｍをこえると、ゴムの硬度が増大し、粘着摩擦力が低下する傾向がある。 The average fiber outer diameter of the hollow glass short fibers is preferably 150 μm or more, and more preferably 200 μm or more. If the average fiber outer diameter of the hollow glass short fiber is less than 150 μm, the fiber has insufficient bending resistance, and the road surface scratching effect (digging friction) tends to be insufficient. Moreover, the average fiber outer diameter of the hollow glass short fiber is preferably 1000 μm or less, and more preferably 500 μm or less. If the average fiber outer diameter of the hollow short glass fibers exceeds 1000 μm, the hardness of the rubber tends to increase and the adhesive frictional force tends to decrease.
中空ガラス短繊維の平均繊維内径は１０μｍ以上が好ましく、５０μｍ以上がより好ましい。中空ガラス短繊維の平均繊維内径が１０μｍ未満では、ガラス短繊維が中空であることによる効果が得られない傾向がある。また、中空ガラス短繊維の平均繊維内径は１２０μｍ以下が好ましく、１００μｍ以下がより好ましい。中空ガラス短繊維の平均繊維内径が１２０μｍをこえると、肉厚が薄くなり、中空ガラス短繊維が壊れやすくなる傾向がある。 The average fiber inner diameter of the hollow glass short fiber is preferably 10 μm or more, and more preferably 50 μm or more. If the average fiber inner diameter of the hollow glass short fiber is less than 10 μm, the effect due to the hollow glass short fiber tends to be not obtained. The average fiber inner diameter of the hollow glass short fibers is preferably 120 μm or less, and more preferably 100 μm or less. When the average fiber inner diameter of the hollow glass short fibers exceeds 120 μm, the thickness becomes thin and the hollow glass short fibers tend to be easily broken.
中空ガラス短繊維の平均繊維長は０．１ｍｍ以上である。中空ガラス短繊維が０．１ｍｍ未満では、ゴム表面への析出長さが短くなり掘り起こし摩擦が不充分になる。また、中空ガラス短繊維の平均繊維長は１５ｍｍ以下、好ましくは１０ｍｍ以下である。中空ガラス短繊維の平均繊維長が１５ｍｍをこえると、中空ガラス短繊維を分散させにくく、中空ガラス短繊維を配向させにくくなり、加工性が悪化する。 The average fiber length of the hollow glass short fiber is 0.1 mm or more. If the hollow glass short fiber is less than 0.1 mm, the precipitation length on the rubber surface is shortened and dug up, resulting in insufficient friction. Moreover, the average fiber length of the hollow glass short fiber is 15 mm or less, preferably 10 mm or less. If the average fiber length of the hollow glass short fibers exceeds 15 mm, the hollow glass short fibers are difficult to disperse, the hollow glass short fibers are difficult to align, and workability is deteriorated.
中空ガラス短繊維の含有量は２重量部以上が好ましく、３重量部以上がより好ましい。中空ガラス短繊維の含有量が２重量部未満では、トレッド表面に現れる中空ガラス短繊維の量が減少し、掘り起こし摩擦が充分に得られない傾向がある。また、中空ガラス短繊維の含有量は５０重量部以下が好ましく、３０重量部以下がより好ましい。中空ガラス短繊維の含有量が５０重量部をこえると、トレッド部におけるブロックの剛性が過度に上がり、トレッドゴム表面を氷雪路面に追随させることができなくなり、粘着、凝着摩擦が低下する傾向がある。 The content of the hollow glass short fiber is preferably 2 parts by weight or more, and more preferably 3 parts by weight or more. When the content of the hollow glass short fibers is less than 2 parts by weight, the amount of the hollow glass short fibers appearing on the tread surface decreases, and there is a tendency that the friction is not sufficiently obtained due to digging. Moreover, the content of the hollow glass short fiber is preferably 50 parts by weight or less, and more preferably 30 parts by weight or less. When the content of the hollow glass short fiber exceeds 50 parts by weight, the rigidity of the block in the tread part is excessively increased, the tread rubber surface cannot follow the snowy and snowy road surface, and the adhesion and adhesion friction tend to be reduced. is there.
本発明のスタッドレスタイヤに用いられるゴム組成物には、前記ゴム成分および中空ガラス短繊維以外にも、従来ゴム工業で使用される配合剤、たとえば、カーボンブラックなどの補強剤、シリカ、シランカップリング剤、オイルなどの軟化剤、ワックス、各種老化防止剤、ステアリン酸、酸化亜鉛、硫黄などの加硫剤、各種加硫促進剤などを、必要に応じて適宜配合することができる。 The rubber composition used in the studless tire of the present invention includes, in addition to the rubber component and the short glass fiber, a compounding agent conventionally used in the rubber industry, such as a reinforcing agent such as carbon black, silica, and silane coupling. Agents, softeners such as oil, waxes, various anti-aging agents, vulcanizing agents such as stearic acid, zinc oxide, and sulfur, various vulcanization accelerators, and the like can be appropriately blended as necessary.
本発明では、得られたゴム組成物を、とくにスタッドレスタイヤのトレッド部に用いる。トレッドの形成方法としては、通常のカレンダーロールによる押出し加工を用いることができるが、カレンダーロールによって繊維を分散させたゴム組成物を圧延加工し、得られたゴムシートを繊維方向に対して垂直な方向に細かい間隔でカットし、それぞれを９０度回転させて貼り合わせる方法により、中空ガラス短繊維をトレッド厚さ方向に配向させる方法などがあげられる。 In the present invention, the obtained rubber composition is used particularly for a tread portion of a studless tire. As a method for forming the tread, an ordinary calender roll extrusion process can be used. A rubber composition in which fibers are dispersed by a calender roll is rolled, and the resulting rubber sheet is perpendicular to the fiber direction. A method of orienting the hollow glass short fibers in the thickness direction of the tread by a method in which the glass fibers are cut at fine intervals in the direction and rotated and bonded to each other by 90 degrees.
本発明のスタッドレスタイヤは、タイヤトレッド部において、中空ガラス短繊維をトレッドの厚さ方向に配向させることにより、ガラスのエッジ成分が増加することにより、氷上の引っ掻き摩擦性能を向上させることができる。 The studless tire of the present invention can improve the scratch friction performance on ice by orienting the hollow glass short fibers in the tread thickness direction in the tire tread portion to increase the edge component of the glass.
本発明のスタッドレスタイヤは、前記方法などで作製したトレッドを他の部材と貼り合わせタイヤ成型機上にて通常の方法で成形することにより、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することによりスタッドレスタイヤを得る。 The studless tire of the present invention forms an unvulcanized tire by molding a tread produced by the above-described method or the like with another member on a tire molding machine by an ordinary method. The unvulcanized tire is heated and pressurized in a vulcanizer to obtain a studless tire.
具体的には、トレッド部から切り出したゴム片のトレッド厚さ方向の複素弾性率（Ｅ１）とタイヤ周方向の複素弾性率（Ｅ２）の比が、下記式を満足することが好ましい。
１．１≦Ｅ１／Ｅ２≦４
Specifically, it is preferable that the ratio of the complex elastic modulus (E1) in the tread thickness direction and the complex elastic modulus (E2) in the tire circumferential direction of the rubber piece cut out from the tread portion satisfies the following formula.
1.1 ≦ E1 / E2 ≦ 4
２５℃で測定したＥ１／Ｅ２は１．１以上が好ましく、１．２以上がより好ましい。Ｅ１／Ｅ２が１．１未満では、短繊維がトレッドの厚さ方向へ配向せず、氷上摩擦性能が不充分となる傾向がある。また、Ｅ１／Ｅ２は４以下が好ましく、３．５以下がより好ましい。Ｅ１／Ｅ２が４をこえると、硬度が増大するため、加工性が悪化する傾向がある。 E1 / E2 measured at 25 ° C. is preferably 1.1 or more, and more preferably 1.2 or more. If E1 / E2 is less than 1.1, the short fibers are not oriented in the thickness direction of the tread, and the on-ice friction performance tends to be insufficient. E1 / E2 is preferably 4 or less, and more preferably 3.5 or less. When E1 / E2 exceeds 4, the hardness increases, and the workability tends to deteriorate.
本発明では、特定の種類の短繊維を、トレッドゴムに配合し、トレッド厚さ方向に配向するように分散させることで、粘着摩擦を損なうことなく、掘り起こし摩擦を向上させ、とくに、氷雪上走行性能が大幅に優れた空気入りタイヤを提供できる。すなわち、短繊維をトレッド厚さ方向に配向させることにより、タイヤトレッドゴム表面は、短繊維の配向方向の影響がなくなり、路面の凹凸に追随する柔らかさを保ち粘着摩擦が改善される。また、タイヤ表面には厚さ方向に配向した短繊維により、局部的に接地圧が高い部分が作り出される。これにより、たとえばタイヤ空転時に凍結路面とタイヤ表面の間に発生する水膜を押しのけ、粘着摩擦を改善するとともに、掘り起こし、引っ掻き摩擦をも同時に向上させることができる。 In the present invention, specific types of short fibers are blended in the tread rubber and dispersed so as to be oriented in the tread thickness direction, thereby improving the digging friction without impairing the adhesive friction, and in particular, running on ice and snow. It is possible to provide a pneumatic tire with significantly improved performance. That is, by orienting the short fibers in the tread thickness direction, the tire tread rubber surface is free from the influence of the orientation direction of the short fibers, and maintains the softness following the unevenness of the road surface, thereby improving the adhesive friction. In addition, a portion having a high ground pressure is locally created on the tire surface by the short fibers oriented in the thickness direction. As a result, for example, a water film generated between the frozen road surface and the tire surface at the time of tire idling can be pushed away to improve adhesion friction, and digging up and scratching friction can be improved at the same time.
実施例にもとづいて、本発明の内容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 contents of the present invention will be specifically described based on examples, but the present invention is not limited to these.
つぎに、実施例および比較例で使用した各種薬品について、まとめて説明する。
天然ゴム（ＮＲ）：ＲＳＳ＃３
ブタジエンゴム（ＢＲ）：宇部興産（株）製のＵＢＥＰＯＬ−ＢＲ１５０Ｂ
カーボンブラック：キャボットジャパン（株）製のショウブラックＮ２２０（Ｎ2ＳＡ：１２５ｍ2／ｇ）
シリカ：日本シリカ工業（株）製のニプシルＶＮ３（Ｎ2ＳＡ：２１０ｍ2／ｇ）
シランカップリング剤：デグッサ社製のＳｉ６９（ビス（３−トリエトキシシリルプロピル）テトラスルフィド）
パラフィンオイル：出光興産（株）製のダイアナプロセスオイル
ワックス：大内新興化学工業（株）製のサンノックＮ
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
酸化亜鉛：三井金属鉱業（株）製の酸化亜鉛１号
中空ガラス短繊維：日本電気硝子（株）製のマイクロキャピラリー（平均繊維外径：２５０μｍ、平均繊維内径：８６μｍ、平均繊維長：８ｍｍ）
ガラス短繊維：エヌエスジー・ヴェトロテックス（株）製のマイクログラスチョップドストラント（平均繊維径：３３μｍ、平均繊維長：３ｍｍ）
硫黄：鶴見化学工業（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−シクロヘキシル−２−ベンゾチアゾリルスルフェンアミド）
Next, various chemicals used in Examples and Comparative Examples will be described together.
Natural rubber (NR): RSS # 3
Butadiene rubber (BR): UBEPOL-BR150B manufactured by Ube Industries, Ltd.
Carbon Black: Show Black N220 (N 2 SA: 125 m 2 / g) manufactured by Cabot Japan
Silica: Nipsil VN3 (N 2 SA: 210 m 2 / g) manufactured by Nippon Silica Kogyo Co., Ltd.
Silane coupling agent: Si69 (bis (3-triethoxysilylpropyl) tetrasulfide) manufactured by Degussa
Paraffin oil: Diana process oil wax from Idemitsu Kosan Co., Ltd .: Sunnock N from Ouchi Shinsei Chemical Co., Ltd.
Anti-aging agent: NOCRACK 6C (N-1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Stearic acid: Zinc oxide manufactured by Nippon Oil & Fats Co., Ltd .: Zinc oxide No. 1 hollow glass short fiber manufactured by Mitsui Mining & Smelting Co., Ltd .: Microcapillary manufactured by Nippon Electric Glass Co., Ltd. (average fiber outer diameter: 250 μm, average fiber inner diameter : 86 μm, average fiber length: 8 mm)
Short glass fiber: Micro glass chopped strand (average fiber diameter: 33 μm, average fiber length: 3 mm) manufactured by NS Vetrotex Co., Ltd.
Sulfur: Powder sulfur vulcanization accelerator manufactured by Tsurumi Chemical Industry Co., Ltd .: Noxeller CZ (N-cyclohexyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
実施例１〜２および比較例１〜２
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、一方向に配向させた未加硫ゴム組成物を得た。さらに、得られた未加硫ゴム組成物を繊維の配向方向に対して垂直な方向に所定の間隔で切断して、それぞれを９０度回転させて貼り合わせ、トレッドの形状に成形し、他のタイヤ部材と貼りあわせ、１７０℃の条件下で１２分間加硫することにより、実施例１〜２および比較例１〜２の試験用スタッドレスタイヤ（タイヤサイズ：１９５／６５Ｒ１５）を製造した。
Examples 1-2 and Comparative Examples 1-2
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 under the condition of 80 ° C., and an unvulcanized rubber composition oriented in one direction was obtained. Obtained. Further, the obtained unvulcanized rubber composition was cut at a predetermined interval in a direction perpendicular to the fiber orientation direction, and each was rotated 90 degrees and bonded together to form a tread shape. The studless tire for a test of Examples 1-2 and Comparative Examples 1-2 (tire size: 195 / 65R15) was manufactured by bonding to a tire member and vulcanizing at 170 ° C. for 12 minutes.
（粘弾性試験）
試験用スタッドレスタイヤのトレッド部から切り出した試験片（幅４ｍｍ、厚み１．０ｍｍおよび長さ５ｍｍ）を用いて、（株）岩本製作所製の粘弾性スペクトロメーターを用いて、初期歪１０％、動歪１％、振動周波数１０Ｈｚの条件下で、２５℃のトレッド厚さ方向および周方向の複素弾性率（Ｅ１およびＥ２）を測定した。
(Viscoelasticity test)
Using a test piece (width 4 mm, thickness 1.0 mm and length 5 mm) cut out from the tread portion of the test studless tire, using an viscoelastic spectrometer manufactured by Iwamoto Seisakusho Co., Ltd., initial strain 10%, dynamic Under conditions of a strain of 1% and a vibration frequency of 10 Hz, the complex elastic modulus (E1 and E2) in the tread thickness direction and the circumferential direction at 25 ° C. was measured.
（氷上摩擦性能）
試験用スタッドレスタイヤを排気量２０００ｃｃの国産ＦＲ車に装着し、時速３０ｋｍ／ｈからの氷盤上での制動停止距離を求めた。さらに、下記式により比較例１を１００として指数表示した。指数が大きいほど氷上摩擦性能に優れている。なお、各配合のタイヤについて、試験実施前にタイヤの表面のならし走行を２００ｋｍ実施している。
（氷上摩擦性能指数）＝（比較例１の制動停止距離）
÷（各配合の制動停止距離）×１００
(Friction performance on ice)
The test studless tire was mounted on a 2000 cc domestic FR vehicle, and the braking stop distance on the ice plate from 30 km / h was determined. Furthermore, the index was displayed with Comparative Example 1 as 100 according to the following formula. The higher the index, the better the friction performance on ice. In addition, about the tire of each mixing | blending, 200 km of running | running | working running of the surface of a tire is implemented before test implementation.
(Friction performance index on ice) = (braking stop distance of Comparative Example 1)
÷ (Brake stop distance for each formulation) x 100
（雪上性能）
試験用スタッドレスタイヤを排気量２０００ｃｃの国産ＦＲ車に装着し、一周２ｋｍの雪上コースにおける周回タイムを３回測定し、その測定値の平均を算出した。さらに、下記式により比較例１を１００として指数表示した。指数が大きいほど雪上性能に優れている。なお、各配合のタイヤについて、試験実施前にタイヤの表面のならし走行を２００ｋｍ実施している。
（雪上性能指数）＝（比較例１の平均周回タイム）
÷（各配合の平均周回タイム）×１００
(Snow performance)
The test studless tire was mounted on a 2000 cc domestic FR vehicle, and the lap time on a snow course of 2 km per round was measured three times, and the average of the measured values was calculated. Furthermore, the index was displayed with Comparative Example 1 as 100 according to the following formula. The larger the index, the better the performance on snow. In addition, about the tire of each mixing | blending, 200 km of running | running | working running of the surface of a tire is implemented before test implementation.
(Snow Performance Index) = (Average lap time of Comparative Example 1)
÷ (Average lap time for each formulation) x 100
上記試験の評価結果を表１に示す。 The evaluation results of the above test are shown in Table 1.
Claims (3)
該中空ガラス短繊維を該トレッドの厚さ方向に配向しているスタッドレスタイヤ。 Having a tread using a rubber composition containing a diene rubber component and hollow glass short fibers,
A studless tire in which the hollow glass short fibers are oriented in the thickness direction of the tread.
平均繊維長が０．１〜５ｍｍである請求項１記載のスタッドレスタイヤ。 The hollow fiber short fiber has an average fiber outer diameter of 150 to 1000 μm,
The studless tire according to claim 1, wherein the average fiber length is 0.1 to 5 mm.
１．１≦Ｅ１／Ｅ２≦４
を満足する請求項１または２記載のスタッドレスタイヤ。 The ratio of the complex elastic modulus E1 in the thickness direction of the tread measured at 25 ° C. to the complex elastic modulus E2 in the tire circumferential direction of the rubber piece cut out from the tread portion is expressed by the formula:
1.1 ≦ E1 / E2 ≦ 4
The studless tire according to claim 1 or 2, which satisfies:
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| JP2006130393A JP4970840B2 (en) | 2006-05-09 | 2006-05-09 | studless tire |
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| JP2006130393A JP4970840B2 (en) | 2006-05-09 | 2006-05-09 | studless tire |
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| JP4970840B2 JP4970840B2 (en) | 2012-07-11 |
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|---|---|---|---|---|
| JPS62298420A (en) * | 1986-06-06 | 1987-12-25 | ピ−ピ−ジ−・インダストリ−ズ・インコ−ポレ−テッド | Porous material for concentrating gas containing silica, manufacture thereof and method of concentrating gas by usingsaid manufacture |
| JPH06328908A (en) * | 1993-05-20 | 1994-11-29 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JPH1095874A (en) * | 1996-09-24 | 1998-04-14 | Teijin Ltd | Rubber composition for reinforced rubber article |
| JP2001039104A (en) * | 1999-07-27 | 2001-02-13 | Sumitomo Rubber Ind Ltd | Studless tire |
| JP2001130220A (en) * | 1999-11-05 | 2001-05-15 | Sumitomo Rubber Ind Ltd | Studless tire |
| JP2001315504A (en) * | 2000-05-10 | 2001-11-13 | Sumitomo Rubber Ind Ltd | Studless tire |
| JP2003267747A (en) * | 2002-03-15 | 2003-09-25 | Ricoh Co Ltd | Electrically conductive hollow glass fiber, its manufacturing method and apparatus |
| JP2004034743A (en) * | 2002-06-28 | 2004-02-05 | Sumitomo Rubber Ind Ltd | Method for manufacturing studless tire and tread |
-
2006
- 2006-05-09 JP JP2006130393A patent/JP4970840B2/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62298420A (en) * | 1986-06-06 | 1987-12-25 | ピ−ピ−ジ−・インダストリ−ズ・インコ−ポレ−テッド | Porous material for concentrating gas containing silica, manufacture thereof and method of concentrating gas by usingsaid manufacture |
| JPH06328908A (en) * | 1993-05-20 | 1994-11-29 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JPH1095874A (en) * | 1996-09-24 | 1998-04-14 | Teijin Ltd | Rubber composition for reinforced rubber article |
| JP2001039104A (en) * | 1999-07-27 | 2001-02-13 | Sumitomo Rubber Ind Ltd | Studless tire |
| JP2001130220A (en) * | 1999-11-05 | 2001-05-15 | Sumitomo Rubber Ind Ltd | Studless tire |
| JP2001315504A (en) * | 2000-05-10 | 2001-11-13 | Sumitomo Rubber Ind Ltd | Studless tire |
| JP2003267747A (en) * | 2002-03-15 | 2003-09-25 | Ricoh Co Ltd | Electrically conductive hollow glass fiber, its manufacturing method and apparatus |
| JP2004034743A (en) * | 2002-06-28 | 2004-02-05 | Sumitomo Rubber Ind Ltd | Method for manufacturing studless tire and tread |
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