JP2005272571A - Side tread rubber composition for heavy duty tire - Google Patents
Side tread rubber composition for heavy duty tire Download PDFInfo
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- JP2005272571A JP2005272571A JP2004086393A JP2004086393A JP2005272571A JP 2005272571 A JP2005272571 A JP 2005272571A JP 2004086393 A JP2004086393 A JP 2004086393A JP 2004086393 A JP2004086393 A JP 2004086393A JP 2005272571 A JP2005272571 A JP 2005272571A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 37
- 239000005060 rubber Substances 0.000 title claims abstract description 37
- 239000000203 mixture Substances 0.000 title claims abstract description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920001194 natural rubber Polymers 0.000 claims abstract description 15
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 12
- 239000006229 carbon black Substances 0.000 claims abstract description 10
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 9
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229920003193 cis-1,4-polybutadiene polymer Polymers 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000004073 vulcanization Methods 0.000 claims abstract description 7
- 241000872198 Serjania polyphylla Species 0.000 claims abstract description 5
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 14
- 239000005062 Polybutadiene Substances 0.000 claims description 4
- 239000000446 fuel Substances 0.000 abstract description 10
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 abstract description 6
- 239000000835 fiber Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- Y02T10/862—
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、重荷重タイヤ用のサイドトレッドゴム組成物に関し、更に詳細には、操縦安定性を確保しつつ、低燃費化を実現できる重荷重タイヤ用のサイドトレッドゴム組成物に関する。 The present invention relates to a side tread rubber composition for heavy duty tires, and more particularly, to a side tread rubber composition for heavy duty tires that can realize low fuel consumption while ensuring steering stability.
近年、長引く不況の影響で、トラック・バス等の重荷重タイヤにおいては、省メンテナンス、低燃費に関する要求が出てきた。これを解決しようとすると、耐摩耗性や操縦安定性が損なわれてしまう。これを改善する手段として、キャップトレッドについてのゴム組成物に関しては多くの特許があるが、サイドトレッドについては少なく、例えば、特許文献１には、天然ゴムと高シス含量のポリブタジエンゴムに対して特定のカーボンブラックとシリカおよびシランカップリング剤の併用によって、低燃費と耐摩耗性を両立させることが、また特許文献２には、天然ゴムもしくはポリイソプレンゴムと少量のシンジオタクチック１,２-ポリブタジエンを含む高シス含量のポリブタジエンゴムに対してカーボンブラックを配合することによって、耐外傷性および耐クラック性を改良することが、更に、特許文献３には、高シス-高ビニル含有ポリブタジエンとそれ以外のジエン系ゴムに対して所定量のカーボンブラックとシリカを配合することによって、スキッド抵抗性／発熱特性を維持しつつ、低燃費性と耐摩耗性の向上を図ることが提案されているが、いずれの先行技術も、耐摩耗性、低燃費化と操縦安定性を両立させるには至っていない。 In recent years, due to the prolonged recession, heavy duty tires such as trucks and buses have been demanded for maintenance-saving and low fuel consumption. If it is going to solve this, wear resistance and handling stability will be spoiled. As a means to improve this, there are many patents concerning the rubber composition for the cap tread, but there are few patents for the side tread. For example, Patent Document 1 discloses a specific method for natural rubber and polybutadiene rubber having a high cis content. It is possible to achieve both low fuel consumption and wear resistance by combining the use of carbon black with silica and a silane coupling agent. Patent Document 2 discloses that natural rubber or polyisoprene rubber and a small amount of syndiotactic 1,2-polybutadiene. It is possible to improve the damage resistance and crack resistance by blending carbon black with a polybutadiene rubber having a high cis content, and further, Patent Document 3 discloses a polybutadiene having a high cis-high vinyl content and others. A certain amount of carbon black and silica are blended with the diene rubber Therefore, it has been proposed to improve fuel efficiency and wear resistance while maintaining skid resistance / heat generation characteristics. However, each of the prior arts has improved wear resistance, fuel efficiency and driving stability. It has not yet been achieved.
本発明では、操縦安定性を確保しつつ低燃費化が実現可能な重荷重タイヤ用サイドトレッドゴム組成物を提供することを目的とする。 An object of the present invention is to provide a side tread rubber composition for heavy-duty tires that can realize low fuel consumption while ensuring steering stability.
本発明によれば、（Ａ）天然ゴムおよび／またはポリイソプレンゴム７０〜３０重量部と、高シス１,４−ポリブタジエンを主成分とするｎ−ヘキサン可溶分が９５重量％以下で、かつシンジオタクティック−１,２−ポリブタジエンを主成分とするｎ−ヘキサン不溶分が５重量％以上であるポリブタジエンゴム３０〜７０重量部とからなるゴム１００重量部、および（Ｂ）Ｎ2ＳＡ≧７０ｍ2／ｇのカーボンブラック２０〜４０重量部とシリカ１０〜３０重量部とを総量で３０〜５０重量部含み、かつ（Ｃ）加硫促進剤対硫黄の配合比が０.６〜０.９であるように配合してなる重荷重タイヤ用サイドトレッドゴム組成物が提供される。 According to the present invention, (A) 70-30 parts by weight of natural rubber and / or polyisoprene rubber, and n-hexane soluble component mainly composed of high cis 1,4-polybutadiene is 95% by weight or less, and 100 parts by weight of a rubber composed of 30 to 70 parts by weight of polybutadiene rubber having a main component of syndiotactic-1,2-polybutadiene and having an n-hexane insoluble content of 5% by weight or more, and (B) N 2 SA ≧ 70 m 2 / g of 20 to 40 parts by weight of carbon black and 10 to 30 parts by weight of silica are included in a total amount of 30 to 50 parts by weight, and (C) the ratio of vulcanization accelerator to sulfur is 0.6 to 0.9. There is provided a side tread rubber composition for heavy duty tires formulated so as to be
本発明では、天然ゴムおよび／またはポリブタジエン系ゴムを用いた重荷重タイヤ用サイドトレッドゴム組成物において、当該ポリブタジエンゴムにＶＣＲ（天然ゴムや合成ゴムに最大径が１０μｍ以下で、かつ平均径が１μｍ未満のシンジオタクチック−１,２−ポリブタジエン短繊維を配合したブタジエンゴムを含むゴム組成物）を選定し、フィラーを所定量のカーボンブラック／シリカブレンドとし、かつ架橋促進剤対硫黄の配合比を規定することによって、モジュラスを下げることなくｔａｎδを下げることで操縦安定性を確保し、かつ低燃費化が図れることを見出したものである。 In the present invention, in a side tread rubber composition for heavy-duty tires using natural rubber and / or polybutadiene rubber, the polybutadiene rubber has a VCR (the maximum diameter is 10 μm or less and the average diameter is 1 μm for natural rubber or synthetic rubber). Rubber composition containing butadiene rubber blended with less than syndiotactic-1,2-polybutadiene short fibers), a predetermined amount of carbon black / silica blend, and a crosslinking accelerator to sulfur blend ratio. It has been found that, by defining, by reducing tan δ without lowering the modulus, it is possible to ensure steering stability and reduce fuel consumption.
本発明に係る重荷重タイヤ用サイドトレッドゴム組成物には、必須成分として、天然ゴムおよび／またはポリイソプレンゴム７０〜３０重量部と、高シス１,４−ポリブタジエンを主成分とするｎ−ヘキサン可溶分が９５重量％以下、好ましくは９０〜８０重量％で、かつシンジオタクティック−１,２−ポリブタジエンを主成分とするｎ−ヘキサン不溶分が５重量％以上、好ましくは１０〜２０重量％であるポリブタジエンゴム３０〜７０重量部とからなるゴム分１００重量部が含まれる。 The side tread rubber composition for heavy duty tires according to the present invention includes, as essential components, 70 to 30 parts by weight of natural rubber and / or polyisoprene rubber and n-hexane containing high cis 1,4-polybutadiene as main components. Soluble content is 95% by weight or less, preferably 90 to 80% by weight, and n-hexane insoluble content mainly composed of syndiotactic-1,2-polybutadiene is 5% by weight or more, preferably 10 to 20% by weight. 100 parts by weight of rubber consisting of 30 to 70 parts by weight of polybutadiene rubber as a percentage.
前記高シス１,４−ポリブタジエンゴムに含まれる構成成分の「シンジオタクティック−１,２−ポリブタジエンを主成分とするｎ−ヘキサン不溶分」とは、実質的に、結晶性シンジオタクチック−１,２−ポリブタジエンからなる短繊維のことであり、これは、例えば、日本化学協会誌月報、１９８８年１月号の第２３頁に記載される方法で製造することができる。本発明では、かかる短繊維を５重量％以上、好ましくは１０〜２０重量％含む高シス１,４−ポリブタジエンゴムを前記天然ゴムもしくはポリイソプレンゴムに配合する。この短繊維の配合量が少な過ぎると補強性が小さいので好ましくなく、逆に多過ぎると補強性が強すぎ、硬くなり過ぎるので好ましくない。また、当該短繊維を含む高シス１,４−ポリブタジエンゴムは、ゴム総量１００重量部に対して、３０〜７０重量部が配合される。この配合量が３０重量部未満では所期の効果が発揮されず、また７０重量部を超えると物性低下が大きくなるので好ましくない。 The component “syndiotactic-1,2-polybutadiene-based n-hexane insoluble component” contained in the high cis 1,4-polybutadiene rubber is substantially crystalline syndiotactic-1. , 2-polybutadiene, which can be produced by the method described in page 23 of the monthly report of the Japan Chemical Society, January 1988, for example. In the present invention, a high cis 1,4-polybutadiene rubber containing 5% by weight or more, preferably 10 to 20% by weight of such short fibers is blended with the natural rubber or polyisoprene rubber. If the amount of the short fiber is too small, the reinforcing property is small, which is not preferable. Conversely, if the amount is too large, the reinforcing property is too strong and too hard, which is not preferable. The high cis 1,4-polybutadiene rubber containing the short fibers is blended in an amount of 30 to 70 parts by weight with respect to 100 parts by weight of the total rubber. If the blending amount is less than 30 parts by weight, the desired effect is not exhibited, and if it exceeds 70 parts by weight, the physical properties decrease greatly, which is not preferable.
本発明に係る重荷重タイヤ用サイドトレッドゴム組成物には、補強剤として、Ｎ2ＳＡ≧７０ｍ2／ｇのカーボンブラック２０〜４０重量部とシリカ１０〜３０重量部とを総量で３０〜５０重量部が配合される。これらの配合比率は、本発明の重荷重タイヤ用サイドトレッドゴム組成物が、シリカによる低燃費化の向上と、カーボンブラックによる硬度および操縦安定性の向上とをバランス良く達成するために必要である。前記カーボンブラックとしては、Ｎ2ＳＡが７０ｍ2／ｇ以上、好ましくは７０〜１００ｍ2／ｇのものを用いることが好ましい。このＮ2ＳＡ値が低過ぎると引張り強さ、モジュラスなどが低下するので好ましくなく、逆に高過ぎると発熱量が大きくなるので好ましくない。 The side-tread rubber composition for heavy-duty tires according to the present invention includes, as a reinforcing agent, 20 to 40 parts by weight of carbon black with N 2 SA ≧ 70 m 2 / g and 10 to 30 parts by weight of silica in a total amount of 30 to 50. Part by weight is blended. These compounding ratios are necessary for the side tread rubber composition for heavy duty tires of the present invention to achieve a good balance between the improvement in fuel economy due to silica and the improvement in hardness and steering stability due to carbon black. . As the carbon black, N 2 SA is 70m 2 / g or more, preferably it is preferred to use those 70~100m 2 / g. If this N 2 SA value is too low, the tensile strength, modulus and the like are lowered, which is not preferable. Conversely, if it is too high, the calorific value is increased, which is not preferable.
また、本発明に係る重荷重タイヤ用サイドトレッドゴム組成物では、加硫促進剤対硫黄の配合比（加硫促進剤／硫黄）が０.６〜０.９であることが必要である。当該配合比が０.６未満であると、モジュラスが低下し操縦安定性が確保できないので好ましくなく、逆に、０.９を超えると、伸びが低下して耐クラック性が悪化するので好ましくない。 Moreover, in the side tread rubber composition for heavy-duty tires according to the present invention, it is necessary that the blending ratio of vulcanization accelerator to sulfur (vulcanization accelerator / sulfur) is 0.6 to 0.9. If the blending ratio is less than 0.6, the modulus decreases and steering stability cannot be secured, which is not preferable. On the other hand, if it exceeds 0.9, the elongation decreases and crack resistance deteriorates, which is not preferable. .
本発明に係る重荷重タイヤ用サイドトレッドゴム組成物には、更に、各種オイル、老化防止剤、可塑剤などタイヤ用に一般的に配合されている各種配合剤を配合することができ、かかる配合物は一般的な方法で混練してゴム組成物とし、加硫することができる。これらの配合量も、本発明の目的に反しない限り、従来の一般的な量とすることができる。 The side tread rubber composition for heavy duty tires according to the present invention can further contain various compounding agents that are generally compounded for tires, such as various oils, anti-aging agents, and plasticizers. The product can be kneaded by a general method to obtain a rubber composition and vulcanized. These blending amounts can also be conventional general amounts as long as they do not contradict the purpose of the present invention.
以下、実施例および比較例にしたがって本発明を更に詳しく説明するが、本発明の技術的範囲をこれらの実施例に限定するものでないことは言うまでもない。 EXAMPLES Hereinafter, although this invention is demonstrated in more detail according to an Example and a comparative example, it cannot be overemphasized that the technical scope of this invention is not limited to these Examples.
試験サンプルの作製
以下の表１に示す配合における加硫促進剤と硫黄を除く成分を１.８Ｌの密閉型ミキサーで５分間混練し、１６０℃に達したときに放出したマスターバッチに加硫促進剤と硫黄を８インチのオープンロールで混練してゴム組成物を得た。次いで、このゴム組成物を１５ｃｍ×１５ｃｍ×０.２ｃｍの金型中で１５０℃、２０分間プレス加硫して目的とする試験片（ゴムシート）を作製し、以下の物性試験に供した。
Preparation of test samples Vulcanization accelerators and ingredients other than sulfur in the formulations shown in Table 1 below were kneaded for 5 minutes in a 1.8 L closed mixer, and vulcanization was accelerated to the master batch released when the temperature reached 160 ° C. The rubber composition was obtained by kneading the agent and sulfur with an 8-inch open roll. Next, the rubber composition was press vulcanized at 150 ° C. for 20 minutes in a 15 cm × 15 cm × 0.2 cm mold to prepare a target test piece (rubber sheet), which was subjected to the following physical property test.
試験方法
１） ＪＩＳ硬度（２０℃）： ＪＩＳ Ｋ６２５３に準拠して、スプリング式硬さ試験Ａ型に基づいて測定した。
２） tanδ（６０℃）： ＪＩＳ Ｋ６３９４に準拠して、粘弾性スペクトロメーター（東洋精機製作所製）を用い、温度６０℃で、それぞれ初期歪：１０％、動的歪：±２％、周波数：２０Ｈｚの条件下で測定した。
３） ３００％モジュラス（Ｍ３００）：ＪＩＳ Ｋ６２５１に準拠して、３号形ダンベルにてシートを打抜き、５００ｍｍ／分の引張速度で引張試験して、Ｍ３００を測定した。
Test Method 1) JIS Hardness (20 ° C.): Measured based on a spring type hardness test A type according to JIS K6253.
2) tan δ (60 ° C.): In accordance with JIS K6394, using a viscoelastic spectrometer (manufactured by Toyo Seiki Seisakusho) at a temperature of 60 ° C., initial strain: 10%, dynamic strain: ± 2%, frequency: Measurement was performed under the condition of 20 Hz.
3) 300% modulus (M300): Based on JIS K6251, a sheet was punched out with a No. 3 dumbbell, and a tensile test was performed at a tensile speed of 500 mm / min, and M300 was measured.
実施例１〜２および比較例１〜８
結果を、以下の表１に示す。
The results are shown in Table 1 below.
以上の結果によると、本発明の実施例に見られるように、ｔａｎδ、Ｈｓおよび３００％モジュラスのバランスの取れたゴム組成物を得ることができた。 According to the above results, as seen in the examples of the present invention, it was possible to obtain a rubber composition in which tan δ, Hs and 300% modulus were balanced.
よって、本発明のゴム組成物は、操縦安定性を確保しつつ、低燃費化を実現できる重荷重タイヤ用のサイドトレッドゴム組成物に有用である。 Therefore, the rubber composition of the present invention is useful as a side tread rubber composition for heavy duty tires that can realize low fuel consumption while ensuring steering stability.
Claims (1)
(A) 70-30 parts by weight of natural rubber and / or polyisoprene rubber, n-hexane soluble component mainly composed of high cis 1,4-polybutadiene is 95% by weight or less, and syndiotactic-1, 100 parts by weight of a rubber comprising 30 to 70 parts by weight of a polybutadiene rubber having a main component of 2-polybutadiene and an n-hexane insoluble content of 5% by weight or more, and (B) carbon black with N 2 SA ≧ 70 m 2 / g 20 to 40 parts by weight and 10 to 30 parts by weight of silica are contained in a total amount of 30 to 50 parts by weight, and (C) the blending ratio of vulcanization accelerator to sulfur is 0.6 to 0.9. A side tread rubber composition for heavy duty tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004086393A JP2005272571A (en) | 2004-03-24 | 2004-03-24 | Side tread rubber composition for heavy duty tire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004086393A JP2005272571A (en) | 2004-03-24 | 2004-03-24 | Side tread rubber composition for heavy duty tire |
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| Publication Number | Publication Date |
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| JP2005272571A true JP2005272571A (en) | 2005-10-06 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007034738A1 (en) | 2005-09-20 | 2007-03-29 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic diagnostic equipment |
| JP2017101218A (en) * | 2015-12-01 | 2017-06-08 | ハンコック タイヤ カンパニー リミテッド | Rubber composition for tire tread and tire manufactured by using the same |
| CN112500615A (en) * | 2020-11-02 | 2021-03-16 | 际华三五三七有限责任公司 | Lightweight rubber flame-retardant disulfide outsole and preparation method and application thereof |
| CN115895058A (en) * | 2022-11-29 | 2023-04-04 | 安徽佳通乘用子午线轮胎有限公司 | A kind of rubber composition and its preparation method and application |
-
2004
- 2004-03-24 JP JP2004086393A patent/JP2005272571A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007034738A1 (en) | 2005-09-20 | 2007-03-29 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic diagnostic equipment |
| JP2017101218A (en) * | 2015-12-01 | 2017-06-08 | ハンコック タイヤ カンパニー リミテッド | Rubber composition for tire tread and tire manufactured by using the same |
| CN112500615A (en) * | 2020-11-02 | 2021-03-16 | 际华三五三七有限责任公司 | Lightweight rubber flame-retardant disulfide outsole and preparation method and application thereof |
| CN115895058A (en) * | 2022-11-29 | 2023-04-04 | 安徽佳通乘用子午线轮胎有限公司 | A kind of rubber composition and its preparation method and application |
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