JP2007131730A - Rubber composition and tire using the same - Google Patents
Rubber composition and tire using the same Download PDFInfo
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Abstract
Description
本発明は、ゴム組成物およびそれを用いたタイヤに関する。 The present invention relates to a rubber composition and a tire using the rubber composition.
従来より、トラック、バスなどの重荷重用タイヤにおいては、耐摩耗性が最重要視されている。 Conventionally, wear resistance has been regarded as most important in heavy duty tires such as trucks and buses.
近年、日本国内において大型トラックにおける輸送状況は、過積載規制、高速道路の拡張、高速道路での速度制限、デジタルタコメーター記録計設置による運行速度管理などによって使用条件が穏やかになってきており、それに伴って、摩耗に対するタイヤ寿命も伸びてきている。そのため、トラック・バス用ラジアルタイヤにおける耐摩耗性としては、低過酷度摩耗条件（高速道路での定速走行のように、タイヤと路面間のスリップが少ない条件）下における耐摩耗性の向上が必要となってきているが、低過酷度摩耗条件下における耐摩耗性については、これまであまり重要視されていなかった。 In recent years, the transportation conditions of large trucks in Japan have become milder due to overloading regulations, expansion of expressways, speed restrictions on expressways, operation speed management by installing digital tachometer recorders, etc. Along with this, the tire life against wear is also increasing. Therefore, the wear resistance of radial tires for trucks and buses is improved under low severe wear conditions (conditions where there is little slip between the tire and the road surface, such as constant speed driving on highways). Although it has become necessary, the wear resistance under low severity wear conditions has not been considered as important so far.
低過酷度摩耗条件下における耐摩耗性については、摩耗形態が粘着による摩耗の影響が大きくなってくることから、ブタジエンゴム（ＢＲ）よりも天然ゴム（ＮＲ）やスチレンブタジエンゴム（ＳＢＲ）を用いることが有利とされているが、重荷重用タイヤの耐摩耗性としては、低過酷度摩耗条件下における耐摩耗性だけでなく、高過酷度摩耗条件（発信・停止によるタイヤと路面間のスリップが頻繁に発生する条件）下における耐摩耗性も必要となり、ＢＲを併用せざるを得ないなど、低過酷度摩耗条件下および高過酷度摩耗条件下における耐摩耗性をバランスよく向上させることは困難であった。また、重荷重用タイヤとしては、それらの耐摩耗性の向上とともに、タイヤの発熱を低減し、省エネルギー化することも要求されている。 With regard to wear resistance under low severity wear conditions, the influence of wear due to the adhesion of the wear form becomes larger, so natural rubber (NR) and styrene butadiene rubber (SBR) are used rather than butadiene rubber (BR). However, the wear resistance of heavy-duty tires is not limited to the wear resistance under low severe wear conditions, but also under high severe wear conditions (slip between the tire and the road surface due to transmission / stop). It is difficult to improve the wear resistance under low and high wear conditions in a well-balanced manner. Met. Further, as heavy-duty tires, it is required to improve their wear resistance, reduce heat generation of the tires, and save energy.
特許文献１には、ＢＲを含むゴム成分に特定の性質を有するカーボンブラックを配合することで、低過酷度摩耗条件下および高過酷度摩耗条件下での耐摩耗性を大幅に向上させ、低燃費性および耐疲労特性を良好に維持するゴム組成物が開示されているが、低過酷度耐摩耗性および耐疲労特性において、充分な改善効果が得られていない。 In Patent Document 1, by adding carbon black having specific properties to a rubber component containing BR, the wear resistance under low severe wear conditions and high severe wear conditions is greatly improved. Although a rubber composition that maintains good fuel economy and fatigue resistance has been disclosed, a sufficient improvement effect has not been obtained in low severity wear resistance and fatigue resistance.
本発明は、低発熱性を維持し、耐ゴム欠け性を向上させ、さらに、低過酷度摩耗条件下および高過酷度摩耗条件下での耐摩耗性をバランスよく向上させたゴム組成物、およびそれを用いたタイヤを提供することを目的とする。 The present invention provides a rubber composition that maintains low heat build-up, improves rubber chipping resistance, and further improves the wear resistance under low and high severity wear conditions in a well-balanced manner, and An object is to provide a tire using the tire.
本発明は、ゴム成分１００重量部に対して、カーボンブラックを４０〜６０重量部含むゴム組成物であって、該ゴム組成物中の硫黄の含有率が０．６〜１重量％であり、該カーボンブラックの臭化セチルトリメチルアンモニウム吸着比表面積（ＣＴＡＢ）が１４０〜１６０ｍ2／ｇ、ヨウ素吸着量（ＩＡ）に対する臭化セチルトリメチルアンモニウム吸着比表面積の比（ＣＴＡＢ／ＩＡ）が０．８５〜１ｍ2／ｍｇ、遠心沈降法による凝集体ストークス相当径（Ｄｓｔ）に対する該凝集体分布の半値幅（ΔＤ５０）の比（ΔＤ５０／Ｄｓｔ）が０．９〜０．９９、ならびにトルエン着色透過度が８０〜１１０％であるゴム組成物に関する。 The present invention is a rubber composition containing 40 to 60 parts by weight of carbon black with respect to 100 parts by weight of the rubber component, and the sulfur content in the rubber composition is 0.6 to 1% by weight, The carbon black has a cetyltrimethylammonium bromide adsorption specific surface area (CTAB) of 140 to 160 m 2 / g and a ratio of the cetyltrimethylammonium bromide adsorption specific surface area to the iodine adsorption amount (IA) (CTAB / IA) of 0.85 to 1 m 2 / mg, ratio of half-width (ΔD50) of aggregate distribution (ΔD50 / Dst) to aggregate Stokes equivalent diameter (Dst) by centrifugal sedimentation method is 0.9 to 0.99, and toluene coloring permeability is It is related with the rubber composition which is 80 to 110%.
前記ゴム成分中のブタジエンゴムの含有率は５〜３０重量％であることが好ましい。 The content of butadiene rubber in the rubber component is preferably 5 to 30% by weight.
また、本発明は、前記ゴム組成物を用いたタイヤに関する。 The present invention also relates to a tire using the rubber composition.
本発明によれば、ゴム成分に特定のカーボンブラックおよび硫黄を所定量配合することで、低発熱性を維持し、耐ゴム欠け性を向上させ、さらに、低過酷度摩耗条件下および高過酷度摩耗条件下での耐摩耗性をバランスよく向上させたゴム組成物、およびそれを用いたタイヤを提供することができる。 According to the present invention, by adding a predetermined amount of specific carbon black and sulfur to the rubber component, the low heat buildup is maintained, the rubber chipping resistance is improved, and the low severe wear condition and the high severe degree are further improved. It is possible to provide a rubber composition having a well-balanced improvement in wear resistance under wear conditions, and a tire using the rubber composition.
本発明のゴム組成物は、ゴム成分、カーボンブラックおよび硫黄を含む。 The rubber composition of the present invention contains a rubber component, carbon black and sulfur.
ゴム成分としては、たとえば、天然ゴム（ＮＲ）、ブタジエンゴム（ＢＲ）、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）など、ゴム工業において一般的に使用されるものがあげられ、これらは単独で用いても、２種以上を組み合わせて用いてもよい。前記ゴム成分としては、耐摩耗性を向上させられるという理由から、ＢＲを含むことが好ましく、低過酷度摩耗条件下での耐摩耗性を向上させられるという理由から、ＮＲとＢＲをブレンドして用いるのがより好ましい。 Examples of the rubber component include those generally used in the rubber industry, such as natural rubber (NR), butadiene rubber (BR), styrene butadiene rubber (SBR), isoprene rubber (IR), and chloroprene rubber (CR). These may be used alone or in combination of two or more. The rubber component preferably contains BR because it can improve wear resistance, and NR and BR can be blended because it can improve wear resistance under low severity wear conditions. More preferably it is used.
ゴム成分中にＢＲを含む場合、ゴム成分中のＢＲの含有率は、５重量％以上が好ましく、１０重量％以上がより好ましい。ＢＲの含有率が５重量％未満では、高過酷度耐摩耗性の改善効果が不充分である傾向がある。また、ＢＲの含有率は、３０重量％以下が好ましく、２５重量％以下がより好ましい。ＢＲの含有率が３０重量％をこえると、充分な低過酷度耐摩耗性の改善効果が得られない傾向がある。 When BR is contained in the rubber component, the content of BR in the rubber component is preferably 5% by weight or more, and more preferably 10% by weight or more. When the BR content is less than 5% by weight, the effect of improving the high severity abrasion resistance tends to be insufficient. Further, the BR content is preferably 30% by weight or less, and more preferably 25% by weight or less. When the BR content exceeds 30% by weight, there is a tendency that a sufficient effect of improving the low degree of abrasion resistance cannot be obtained.
本発明で使用するカーボンブラックの臭化セチルトリメチルアンモニウム吸着比表面積（ＣＴＡＢ）は、１４０ｍ2／ｇ以上、好ましくは１４５ｍ2／ｇ以上である。カーボンブラックのＣＴＡＢが１４０ｍ2／ｇ未満では、充分な耐摩耗性の改善効果が得られない。また、カーボンブラックのＣＴＡＢは、１６０ｍ2／ｇ以下、好ましくは１５５ｍ2／ｇ以下である。カーボンブラックのＣＴＡＢが１６０ｍ2／ｇをこえると、低発熱性および低燃費性が低下する。 The carbon black used in the present invention has a cetyltrimethylammonium bromide adsorption specific surface area (CTAB) of 140 m 2 / g or more, preferably 145 m 2 / g or more. If the CTAB of carbon black is less than 140 m 2 / g, a sufficient effect of improving wear resistance cannot be obtained. The CTAB of carbon black is 160 m 2 / g or less, preferably 155 m 2 / g or less. When CTAB of carbon black exceeds 160 m 2 / g, low heat build-up and low fuel consumption are lowered.
カーボンブラックのヨウ素吸着量（ＩＡ）は、１４０ｍｇ／ｇ以上が好ましく、１４５ｍｇ／ｇ以上がより好ましい。カーボンブラックのＩＡが１４０ｍｇ／ｇ未満では、充分な耐摩耗性の改善効果が得られない傾向がある。また、カーボンブラックのＩＡは、１７０ｍｇ／ｇ以下が好ましく、１６５ｍｇ／ｇ以下がより好ましい。カーボンブラックのＩＡが１７０ｍｇ／ｇをこえると、低発熱性および低燃費性が低下する傾向がある。 The iodine adsorption amount (IA) of carbon black is preferably 140 mg / g or more, and more preferably 145 mg / g or more. If the IA of the carbon black is less than 140 mg / g, there is a tendency that a sufficient effect of improving the wear resistance cannot be obtained. The IA of carbon black is preferably 170 mg / g or less, and more preferably 165 mg / g or less. When IA of carbon black exceeds 170 mg / g, low heat buildup and low fuel consumption tend to be lowered.
カーボンブラックのヨウ素吸着量に対する臭化セチルトリメチルアンモニウム吸着比表面積の比（ＣＴＡＢ／ＩＡ）は、０．８５ｍ2／ｍｇ以上、好ましくは０．８７ｍ2／ｍｇ以上である。カーボンブラックのＣＴＡＢ／ＩＡが０．８５ｍ2／ｍｇ未満では、充分な低過酷度摩耗条件下および高過酷度摩耗条件下での耐摩耗性ならびに低発熱性の改善効果が得られない。また、カーボンブラックのＣＴＡＢ／ＩＡは、１ｍ2／ｍｇ以下、好ましくは０．９５ｍ2／ｍｇ以下である。カーボンブラックのＣＴＡＢ／ＩＡが１ｍ2／ｍｇをこえると、充分な低過酷度摩耗条件下および高過酷度摩耗条件下での耐摩耗性の改善効果が得られず、耐疲労特性が低下する。 The ratio of the cetyltrimethylammonium bromide adsorption specific surface area to the iodine adsorption amount of carbon black (CTAB / IA) is 0.85 m 2 / mg or more, preferably 0.87 m 2 / mg or more. When CTAB / IA of carbon black is less than 0.85 m 2 / mg, the improvement effect of the wear resistance and the low heat build-up property under the sufficiently low severe wear condition and the high severe wear condition cannot be obtained. Moreover, CTAB / IA of carbon black is 1 m 2 / mg or less, preferably 0.95 m 2 / mg or less. When the CTAB / IA of carbon black exceeds 1 m 2 / mg, the effect of improving the wear resistance under sufficiently low severe wear conditions and high severe wear conditions cannot be obtained, and the fatigue resistance characteristics deteriorate.
本発明で使用するカーボンブラックは、特定の遠心沈降法による凝集体ストークス相当径（Ｄｓｔ）および該凝集体分布の半値幅（ΔＤ５０）を有することが好ましい。 The carbon black used in the present invention preferably has an aggregate Stokes equivalent diameter (Dst) by a specific centrifugal sedimentation method and a half width (ΔD50) of the aggregate distribution.
遠心沈降法によるカーボンブラックの凝集体ストークス相当径（Ｄｓｔ）は、５０ｎｍ以上が好ましく、５５ｎｍ以上がより好ましい。カーボンブラックのＤｓｔが５０ｎｍ未満では、低発熱性および加工性が低下する傾向がある。また、カーボンブラックのＤｓｔは、７０ｎｍ以下が好ましく、６５ｎｍ以下がより好ましい。カーボンブラックのＤｓｔが７０ｎｍをこえると、耐摩耗性が低下する傾向がある。 The aggregate Stokes equivalent diameter (Dst) of carbon black by centrifugal sedimentation method is preferably 50 nm or more, and more preferably 55 nm or more. If Dst of carbon black is less than 50 nm, low heat build-up and processability tend to be reduced. Further, Dst of carbon black is preferably 70 nm or less, and more preferably 65 nm or less. When Dst of carbon black exceeds 70 nm, the wear resistance tends to decrease.
遠心沈降法によるカーボンブラックの凝集体分布の半値幅（ΔＤ５０）は、４０ｎｍ以上が好ましく、４５ｎｍ以上がより好ましい。カーボンブラックのΔＤ５０が４０ｎｍ未満では、低発熱性および加工性が低下する傾向がある。また、カーボンブラックのΔＤ５０は、６５ｎｍ以下が好ましく、６３ｎｍ以下がより好ましい。カーボンブラックのΔＤ５０が６５ｎｍをこえると、耐摩耗性が低下する傾向がある。 The full width at half maximum (ΔD50) of the aggregate distribution of carbon black by centrifugal sedimentation is preferably 40 nm or more, and more preferably 45 nm or more. When ΔD50 of carbon black is less than 40 nm, low heat build-up and processability tend to be reduced. Further, the ΔD50 of carbon black is preferably 65 nm or less, and more preferably 63 nm or less. When the ΔD50 of carbon black exceeds 65 nm, the wear resistance tends to decrease.
Ｄｓｔに対するΔＤ５０の比（ΔＤ５０／Ｄｓｔ）は０．９以上、好ましくは０．９２以上である。カーボンブラックのΔＤ５０／Ｄｓｔが０．９未満では、充分な低過酷度耐摩耗性の改善効果が得られない。また、カーボンブラックのΔＤ５０／Ｄｓｔは０．９９以下、好ましくは０．９７以下である。カーボンブラックのΔＤ５０／Ｄｓｔが０．９９をこえると、高過酷度耐摩耗性が低下する。 The ratio of ΔD50 to Dst (ΔD50 / Dst) is 0.9 or more, preferably 0.92 or more. When ΔD50 / Dst of carbon black is less than 0.9, sufficient improvement effect of low severity abrasion resistance cannot be obtained. Further, ΔD50 / Dst of carbon black is 0.99 or less, preferably 0.97 or less. When the ΔD50 / Dst of carbon black exceeds 0.99, the high severe wear resistance decreases.
カーボンブラックのトルエン着色透過度は８０％以上、好ましくは８５％以上である。カーボンブラックのトルエン着色透過度が８０％未満では、カーボンブラックの生成状態が不安定で、耐摩耗性が低下する。また、カーボンブラックのトルエン着色透過度は１１０％以下、好ましくは１００％以下である。カーボンブラックのトルエン着色透過度が１１０％未満では、表面活性が低下して耐摩耗性が低下する。なお、トルエン着色透過度は、ＪＩＳ Ｋ ６２１８−４「ゴム用カーボンブラック−付随的特性−第４部：トルエン着色透過度の求め方」に準じて測定した。 The toluene coloring transmittance of carbon black is 80% or more, preferably 85% or more. When the toluene coloring transmittance of carbon black is less than 80%, the generation state of carbon black is unstable and the wear resistance is lowered. Carbon toluene has a toluene coloring transmittance of 110% or less, preferably 100% or less. When the toluene coloring transmittance of carbon black is less than 110%, the surface activity is lowered and the wear resistance is lowered. The toluene color permeability was measured in accordance with JIS K 6218-4 “Carbon black for rubber—incidental characteristics—Part 4: Determination of toluene color permeability”.
カーボンブラックの含有量は、ゴム成分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。カーボンブラックの含有量が４０重量部未満では、充分な耐摩耗性の改善効果が得られない。カーボンブラックの含有量は６０重量部以下、好ましくは５５重量部以下である。カーボンブラックの含有量が６０重量部をこえると、低発熱性および耐疲労特性が低下する。 The content of 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 rubber component. If the carbon black content is less than 40 parts by weight, a sufficient effect of improving wear resistance cannot be obtained. The content of carbon black is 60 parts by weight or less, preferably 55 parts by weight or less. When the content of carbon black exceeds 60 parts by weight, the low heat buildup and fatigue resistance are deteriorated.
本発明において使用される硫黄としては、ゴム工業において使用される一般的なものでよい。 The sulfur used in the present invention may be a common sulfur used in the rubber industry.
本発明のゴム組成物中の硫黄の含有率は、０．６重量％以上、好ましくは０．７重量％以上である。硫黄の含有率が０．６重量％未満では、低発熱性が低下する。また、硫黄の含有率は１．０重量％以下、好ましくは０．９重量％以下である。硫黄の含有率が１．０重量％をこえると、低過酷度耐摩耗性が低下する。 The sulfur content in the rubber composition of the present invention is 0.6% by weight or more, preferably 0.7% by weight or more. When the sulfur content is less than 0.6% by weight, the low exothermic property is lowered. The sulfur content is 1.0% by weight or less, preferably 0.9% by weight or less. When the content of sulfur exceeds 1.0% by weight, the low severity abrasion resistance is lowered.
本発明のタイヤ用ゴム組成物には、前記ゴム成分、カーボンブラックおよび硫黄のほかに、通常タイヤ用ゴム組成物に用いられる配合剤、たとえば、シリカなどの補強剤、ワックスなどの軟化剤、老化防止剤、ステアリン酸、酸化亜鉛、加硫促進剤などを適宜配合することができる。 In the tire rubber composition of the present invention, in addition to the rubber component, carbon black and sulfur, compounding agents usually used in tire rubber compositions, for example, reinforcing agents such as silica, softeners such as wax, aging, etc. An inhibitor, stearic acid, zinc oxide, a vulcanization accelerator and the like can be appropriately blended.
本発明のタイヤは、本発明のゴム組成物を用いて通常の方法で製造される。すなわち、必要に応じて前記配合剤を配合した本発明のゴム組成物を、未加硫の段階でタイヤの各部材の形状にあわせて押出し加工し、タイヤ成形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タイヤを得る。 The tire of the present invention is produced by a usual method using the rubber composition of the present invention. That is, if necessary, the rubber composition of the present invention blended with the above-mentioned compounding agent is extruded in accordance with the shape of each member of the tire at an unvulcanized stage and molded on a tire molding machine by a normal method. By doing so, an unvulcanized tire is formed. The unvulcanized tire is heated and pressurized in a vulcanizer to obtain a tire.
本発明のゴム組成物は、低過酷度摩耗条件下および高過酷度摩耗条件下での耐摩耗性をともに向上させることができ、バス、トラックなどの重荷重用タイヤのトレッドなどに好適に用いられる。 The rubber composition of the present invention can improve both wear resistance under low and high severity wear conditions, and is suitably used for treads of heavy duty tires such as buses and trucks. .
さらに、本発明のゴム組成物から得られるタイヤは、過度の摩耗を抑制できるため、タイヤの寿命をのばすことが可能であり、使用者のタイヤにかかるコストを低減できる。 Furthermore, since the tire obtained from the rubber composition of the present invention can suppress excessive wear, the life of the tire can be extended, and the cost of the tire of the user can be reduced.
実施例に基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 thereto.
実施例および比較例において使用した薬品をまとめて示す。
天然ゴム（ＮＲ）：ＴＳＲ２０
ブタジエンゴム：宇部興産（株）製のＢＲ１５０Ｌ
カーボンブラックＡ〜Ｈ
硫黄：日本乾硫社製の粉末硫黄
酸化亜鉛：三井金属鉱業（株）製
ステアリン酸：日本油脂（株）製
老化防止剤：精工化学（株）製のオゾノン６Ｃ（Ｎ−（１，３−ジメチルブチル）−Ｎ’−フェニル−ｐ−フェニレンジアミン）
ワックス：日本精鑞（株）製のオゾエース０３５５
加硫促進剤ＴＢＢＳ：大内新興化学工業（株）製のノクセラーＮＳ（Ｎ−ｔｅｒｔ−ブチル−２−ベンゾチアゾリルスルフェンアミド）
The chemical | medical agent used in the Example and the comparative example is shown collectively.
Natural rubber (NR): TSR20
Butadiene rubber: BR150L manufactured by Ube Industries, Ltd.
Carbon black A ~ H
Sulfur: Powdered sulfur oxide manufactured by Nippon Suizo Co., Ltd .: Mitsui Metal Mining Co., Ltd. Stearic acid: Nippon Oil & Fats Co., Ltd. Anti-aging agent: Seiko Chemical Co., Ltd. Ozonon 6C (N- (1,3- Dimethylbutyl) -N′-phenyl-p-phenylenediamine)
Wax: Ozoace 0355 manufactured by Nippon Seiki Co., Ltd.
Vulcanization accelerator TBBS: Noxeller NS (N-tert-butyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
カーボンブラックＡ〜Ｈの各物性値をそれぞれ表１に示す。 Table 1 shows the physical property values of the carbon blacks A to H.
実施例１〜４および比較例１〜１０
表２に示す配合量のＮＲ、ＢＲ、カーボンブラック、酸化亜鉛、ステアリン酸、老化防止剤およびワックスを配合し、バンバリーミキサーを用いて、１５０℃になるまで４分間混練りして、混練物を得た。そして、前記混練物に、表２に示す配合量の硫黄および加硫促進剤ＴＢＢＳを添加し、２軸オープンロールを用いて、４０℃の条件下で４分間混練りして未加硫ゴム組成物を作製し、該未加硫ゴム組成物を１５０℃の条件下で３０分間プレス加硫することで、実施例１〜４および比較例１〜１０の加硫ゴム組成物を作製し、ランボーン摩耗試験に使用した。
Examples 1-4 and Comparative Examples 1-10
Blending amounts of NR, BR, carbon black, zinc oxide, stearic acid, anti-aging agent and wax shown in Table 2 were blended, and kneaded for 4 minutes using a Banbury mixer until 150 ° C. Obtained. Then, sulfur and a vulcanization accelerator TBBS having the blending amounts shown in Table 2 are added to the kneaded product, and the mixture is kneaded for 4 minutes under a condition of 40 ° C. using a biaxial open roll. The vulcanized rubber compositions of Examples 1 to 4 and Comparative Examples 1 to 10 were prepared by press vulcanizing the unvulcanized rubber composition at 150 ° C. for 30 minutes. Used for wear test.
（低過酷度摩耗試験）
作製した加硫ゴム組成物から試験片を作製し、（株）岩本製作所製のランボーン摩耗試験機を用いて、表面回転速度８０ｍ／ｍｉｎ、荷重３．０ｋｇ、スリップ率２０％および落砂量１５ｇ／ｍｉｎの条件下で、試験時間３分間として試験を実施し、各配合の容積損失量を測定した。そして下記計算式により、比較例１の低過酷度摩耗指数を１００とし、それぞれ指数表示した。低過酷度摩耗指数が大きいほど、低過酷度摩耗条件下での耐摩耗性に優れていることを示す。
（低過酷度摩耗指数）＝（比較例１の低過酷度摩耗条件下での容積損失量）
÷（各配合の低過酷度摩耗条件下での容積損失量）×１００
(Low severity wear test)
A test piece was produced from the produced vulcanized rubber composition, and using a Lambourne abrasion tester manufactured by Iwamoto Seisakusho Co., Ltd., surface rotation speed 80 m / min, load 3.0 kg, slip rate 20%, and sand fall 15 g. The test was conducted under the condition of / min with a test time of 3 minutes, and the volume loss amount of each formulation was measured. And according to the following calculation formula, the low severity abrasion index of Comparative Example 1 was set to 100, and each index was displayed. It shows that it is excellent in the abrasion resistance under low severe abrasion conditions, so that a low severe abrasion index is large.
(Low severity wear index) = (Volume loss under low severity wear conditions in Comparative Example 1)
÷ (volume loss amount under low severity wear condition of each compound) × 100
（高過酷度摩耗試験）
作製した加硫ゴム組成物から試験片を作製し、（株）岩本製作所製のランボーン摩耗試験機を用いて、表面回転速度８０ｍ／ｍｉｎ、荷重３．０ｋｇ、スリップ率４０％および落砂量１５ｇ／ｍｉｎの条件下で、試験時間３分間として試験を実施し、それぞれの容積損失量を測定した。そして下記計算式により、比較例１の高過酷度摩耗指数を１００とし、それぞれ指数表示した。高過酷度摩耗指数が大きいほど、高過酷度摩耗条件下での耐摩耗性に優れていることを示す。
（高過酷度摩耗指数）＝（比較例１の高過酷度摩耗条件下での容積損失量）
÷（各配合の高過酷度摩耗条件下での容積損失量）×１００
(High severity wear test)
A test piece was prepared from the prepared vulcanized rubber composition, and the surface rotation speed was 80 m / min, the load was 3.0 kg, the slip rate was 40%, and the amount of sand fall was 15 g using a lambone wear tester manufactured by Iwamoto Seisakusho. The test was conducted under the condition of / min with a test time of 3 minutes, and each volume loss was measured. And according to the following calculation formula, the high severity abrasion index of Comparative Example 1 was set to 100, and each index was displayed. It shows that it is excellent in the abrasion resistance under high severe wear conditions, so that a high severe wear index is large.
(High Severity Abrasion Index) = (Volume Loss of Comparative Example 1 under High Severity Abrasion Conditions)
÷ (volume loss under high severe wear condition of each compound) × 100
（粘弾性試験）
前記未加硫ゴム組成物をトレッド形状に成形して、他のタイヤ部材と貼りあわせ、１５０℃および２０ｋｇｆの条件下で４５分間加硫することにより、実施例１〜４および比較例１〜１０に使用する重荷重用新品タイヤ（タイヤサイズ：１１Ｒ２２．５）を作製し、粘弾性試験および引張試験に用いた。
(Viscoelasticity test)
Examples 1 to 4 and Comparative Examples 1 to 10 were formed by molding the unvulcanized rubber composition into a tread shape, pasting it with other tire members, and vulcanizing them at 150 ° C. and 20 kgf for 45 minutes. A new heavy-duty tire (tire size: 11R22.5) to be used for the viscoelasticity test and tensile test was prepared.
作製したタイヤのトレッドから、幅４ｍｍ、厚さ１．８〜２．２ｍｍ、長さ３０ｍｍの試験片を切り出し、（株）岩本製作所製の粘弾性スペクトロメーターＶＥＳを用いて、温度７０℃、周波数１０Ｈｚ、初期歪１０％、動歪２％の条件下で、損失正接（ｔａｎδ）の測定を行なった。ｔａｎδが低いほど、発熱が低く、低燃費化が可能である事を示す。 A test piece having a width of 4 mm, a thickness of 1.8 to 2.2 mm, and a length of 30 mm was cut out from the tread of the produced tire, and a temperature of 70 ° C. and a frequency were measured using a viscoelastic spectrometer VES manufactured by Iwamoto Seisakusho Co., Ltd. Loss tangent (tan δ) was measured under the conditions of 10 Hz, initial strain of 10%, and dynamic strain of 2%. The lower tan δ, the lower the heat generation and the lower the fuel consumption.
（引張試験）
作製したタイヤのトレッドから、幅２５ｍｍ、厚さ２ｍｍ、長さ１００ｍｍの試験片を切り出し、ギヤーオーブン試験機を用いて、８０℃の条件下で１０日間熱老化させ、ＪＩＳ Ｋ ６２５１「加硫ゴム及び熱可塑性ゴム―引張特性の求め方」に準じて、それぞれの破断強度（ＴＢ）および破断時伸び（ＥＢ）を測定し、その積（ＴＢ×ＥＢ）を算出した。そして、下記計算式により、比較例１の耐ゴム欠け性指数を１００として、それぞれ指数表示した。耐ゴム欠け性指数が大きいほど、耐ゴム欠け性に優れることを示す。
（耐ゴム欠け性指数）＝（各配合の（ＴＢ×ＥＢ））
÷（比較例１の（ＴＢ×ＥＢ））×１００
(Tensile test)
A test piece having a width of 25 mm, a thickness of 2 mm, and a length of 100 mm was cut out from the tread of the produced tire, and heat-aged for 10 days under a condition of 80 ° C. using a gear oven tester. JIS K 6251 “vulcanized rubber” And thermoplastic rubber—how to obtain tensile properties ”, the respective breaking strength (TB) and elongation at break (EB) were measured, and the product (TB × EB) was calculated. Then, by the following calculation formula, the rubber chipping resistance index of Comparative Example 1 was set to 100, and each index was displayed. The larger the rubber chipping resistance index, the better the rubber chipping resistance.
(Rubber chipping resistance index) = ((TB × EB) of each formulation)
÷ ((TB × EB) of Comparative Example 1) × 100
前記試験結果を表２に示す。 The test results are shown in Table 2.
Claims (3)
カーボンブラックを４０〜６０重量部含むゴム組成物であって、
該ゴム組成物中の硫黄の含有率が０．６〜１重量％であり、
該カーボンブラックの臭化セチルトリメチルアンモニウム吸着比表面積（ＣＴＡＢ）が１４０〜１６０ｍ2／ｇ、ヨウ素吸着量（ＩＡ）に対する臭化セチルトリメチルアンモニウム吸着比表面積の比（ＣＴＡＢ／ＩＡ）が０．８５〜１ｍ2／ｍｇ、遠心沈降法による凝集体ストークス相当径（Ｄｓｔ）に対する該凝集体分布の半値幅（ΔＤ５０）の比（ΔＤ５０／Ｄｓｔ）が０．９〜０．９９、ならびにトルエン着色透過度が８０〜１１０％であるゴム組成物。 For 100 parts by weight of rubber component
A rubber composition containing 40 to 60 parts by weight of carbon black,
The sulfur content in the rubber composition is 0.6 to 1% by weight;
The carbon black has a cetyltrimethylammonium bromide adsorption specific surface area (CTAB) of 140 to 160 m 2 / g and a ratio of the cetyltrimethylammonium bromide adsorption specific surface area to the iodine adsorption amount (IA) (CTAB / IA) of 0.85 to 1 m 2 / mg, ratio of half-width (ΔD50) of aggregate distribution (ΔD50 / Dst) to aggregate Stokes equivalent diameter (Dst) by centrifugal sedimentation method is 0.9 to 0.99, and toluene coloring permeability is A rubber composition that is 80-110%.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009043399A1 (en) | 2008-11-06 | 2010-05-12 | Sumitomo Rubber Industries Ltd., Kobe-shi | Rubber composition for a base tread and tire |
| WO2011125637A1 (en) * | 2010-03-31 | 2011-10-13 | 株式会社ブリヂストン | Rubber composition and tire using same |
| DE102013212206A1 (en) | 2012-06-27 | 2014-01-02 | Sumitomo Rubber Industries, Ltd. | Rubber composition for a tire and pneumatic tire |
| WO2014148453A1 (en) * | 2013-03-22 | 2014-09-25 | 株式会社ブリヂストン | Rubber composition for tires and pneumatic tire |
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| WO2018225478A1 (en) * | 2017-06-07 | 2018-12-13 | 株式会社ブリヂストン | Rubber composition for tire and tire |
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| US9890267B2 (en) | 2013-03-22 | 2018-02-13 | Bridgestone Corporation | Rubber composition for tires and pneumatic tire |
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| EP2998351A4 (en) * | 2013-06-14 | 2017-01-18 | Sumitomo Rubber Industries, Ltd. | Rubber composition and pneumatic tire |
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