JP2006328107A - Rubber composition for tire tread - Google Patents
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- JP2006328107A JP2006328107A JP2005149484A JP2005149484A JP2006328107A JP 2006328107 A JP2006328107 A JP 2006328107A JP 2005149484 A JP2005149484 A JP 2005149484A JP 2005149484 A JP2005149484 A JP 2005149484A JP 2006328107 A JP2006328107 A JP 2006328107A
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Abstract
Description
本発明は、タイヤトレッド用ゴム組成物に関し、更に詳細には、破断物性を悪化させずに硬度を高めて、耐カット性を向上させたタイヤトレッド用ゴム組成物に関する。 The present invention relates to a rubber composition for a tire tread, and more particularly, to a rubber composition for a tire tread that has improved hardness without deteriorating fracture properties and improved cut resistance.
悪路走行向け重荷重タイヤのキャップトレッド及びベーストレッドでは、耐カット性の向上のために硬度を高くすることが求められている。従来、かかる硬度を高くするために、1)カーボンブラックを増量する、あるいは2)硫黄や加硫促進剤を増量することが行われてきたが、1)では、発熱の悪化と破断伸びの低下があり、また、2)では、破断伸びが低下してしまうという問題があった。 Cap treads and base treads of heavy-duty tires for running on rough roads are required to have high hardness in order to improve cut resistance. Conventionally, in order to increase the hardness, 1) increasing the amount of carbon black or 2) increasing the amount of sulfur or vulcanization accelerator, but in 1), the exothermic deterioration and the elongation at break are reduced. In addition, in 2), there was a problem that the elongation at break was lowered.
これまで、特開昭59−73944号公報として、スチールコードコンベアベルトやスチールラジアルタイヤ等のようなゴムと金属材との複合物において、当該ゴムと金属材との接着力の向上を図るために、ゴム中に亜鉛、アルミニウム、銅、ニッケル、マグネシウム、アンチモン、鉄等の金属粉末と有機酸コバルトを配合した接着ゴム組成物を用いる技術が知られているが、当該技術は、本発明とはそのゴム組成物の配合組成の点で近似するものの、その使用目的、使用態様、及び上記成分の配合量などが全く異なり、本発明を教示するものではない。 Until now, as disclosed in Japanese Patent Application Laid-Open No. 59-73944, in order to improve the adhesion between the rubber and the metal material in a composite of the rubber and the metal material such as a steel cord conveyor belt and a steel radial tire. In addition, a technique using an adhesive rubber composition in which metal powder such as zinc, aluminum, copper, nickel, magnesium, antimony, iron, and the like and an organic acid cobalt is blended in rubber is known. Although approximate in terms of the compounding composition of the rubber composition, the purpose of use, the mode of use, the compounding amount of the above components, etc. are completely different and do not teach the present invention.
本発明では、破断物性を悪化させずに、硬度を高めて耐カット性を改善するタイヤトレッド用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 rubber composition for a tire tread that increases hardness and improves cut resistance without deteriorating fracture physical properties.
本発明によれば、天然ゴム及び/又は合成ポリイソプレンゴムを主体としたジエン系ゴム100重量部に対し、比表面積0.1〜10.0m2/gの銅粉0.1〜10.0重量部、及び有機酸コバルトをコバルト換算で0.05重量部未満配合してなるタイヤトレッド用ゴム組成物、並びにこれを用いた重荷重用タイヤが提供される。 According to the present invention, copper powder of 0.1 to 10.0 having a specific surface area of 0.1 to 10.0 m 2 / g with respect to 100 parts by weight of diene rubber mainly composed of natural rubber and / or synthetic polyisoprene rubber. Provided are a rubber composition for a tire tread obtained by blending less than 0.05 parts by weight of cobalt and an organic acid cobalt in terms of cobalt, and a heavy load tire using the same.
本発明では、天然ゴム及び/又は合成ポリイソプレンゴムを主体としたジエン系ゴムからなる悪路向け重荷重タイヤトレッド用ゴム組成物に、所定の銅粉と有機酸コバルトとを配合することで、破断物性を悪化させずに、硬度を高めて耐カット性を改善することに成功したものである。 In the present invention, by blending a predetermined copper powder and organic acid cobalt in a rubber composition for heavy-duty tire treads for rough roads composed of diene rubber mainly composed of natural rubber and / or synthetic polyisoprene rubber, It has succeeded in improving the cut resistance by increasing the hardness without deteriorating the fracture property.
本発明のタイヤトレッド用ゴム組成物におけるゴム成分としては、天然ゴム及び/又は合成ポリイソプレンゴムを主体としたジエン系ゴムが用いられる。天然ゴム及び/又は合成ポリイソプレンゴムを主体としたジエン系ゴムとは、ジエン系ゴム全体に対して天然ゴム及び/又は合成ポリイソプレンゴムの占める割合が、これらゴム成分の総量で50重量部以上であることを意味し、その他のジエン系ゴム、例えば、各種スチレン−ブタジエン共重合体ゴム(SBR)、各種ポリブタジエンゴム(BR)、アクリロニトリル−ブタジエン共重合体ゴム(NBR)などを適宜、必要量配合したブレンドゴムを使用してもよい。 As the rubber component in the rubber composition for a tire tread of the present invention, a diene rubber mainly composed of natural rubber and / or synthetic polyisoprene rubber is used. The diene rubber mainly composed of natural rubber and / or synthetic polyisoprene rubber means that the ratio of the natural rubber and / or synthetic polyisoprene rubber to the total diene rubber is 50 parts by weight or more in the total amount of these rubber components. Other diene rubbers such as various styrene-butadiene copolymer rubbers (SBR), various polybutadiene rubbers (BR), acrylonitrile-butadiene copolymer rubbers (NBR), etc. A blended blend rubber may be used.
本発明のタイヤトレッド用ゴム組成物に配合する銅粉としては、その比表面積が0.1〜10.0m2/g、より好ましくは0.2〜4.0m2/gであるものを、0.1〜10.0重量部、より好ましくは0.5〜7.0重量部の量で用いられる。当該銅粉の比表面積が0.1m2/g未満のものでは異物状態になり易く、また逆に10.0m2/gを超えるものでは、酸化劣化し易くてゴム物性が不安定になるので、好ましくない。また、その配合量が0.1重量部では所期の効果が発揮できず、逆に10.0重量部を超えると、ゴム物性の低下をもたらすので好ましくない。 The copper powder blended in the tire tread rubber composition of the present invention has a specific surface area of 0.1 to 10.0 m 2 / g, more preferably 0.2 to 4.0 m 2 / g. It is used in an amount of 0.1 to 10.0 parts by weight, more preferably 0.5 to 7.0 parts by weight. If the specific surface area of the copper powder is less than 0.1 m 2 / g, it is likely to be in a foreign state, and conversely if it exceeds 10.0 m 2 / g, it tends to be oxidatively deteriorated and the rubber properties become unstable. It is not preferable. On the other hand, when the blending amount is 0.1 parts by weight, the desired effect cannot be exhibited.
本発明のタイヤトレッド用ゴム組成物に配合する有機酸コバルトとしては、広範囲の有機酸のコバルト塩が使用可能であり、例えば、ナフテン酸コバルト、ステアリン酸コバルト、オレイン酸コバルト、リノール酸コバルト、リノレイン酸コバルト、パルミチン酸コバルト、ネオデカン酸コバルト、ロジン酸コバルト、トール油酸コバルト、ホウ酸三ネオデカン酸コバルトなどが挙げられる。かかる有機酸コバルトの配合量は、コバルト換算で0.05重量部未満、より好ましくは0.01〜0.04重量部とすることが好ましい。当該コバルト量が0.05重量部を超えると、加工性が悪化し、加硫ゴムの物性が著しく低下する等のため好ましくない。 As the organic acid cobalt compounded in the rubber composition for tire treads of the present invention, a wide range of organic acid cobalt salts can be used. For example, cobalt naphthenate, cobalt stearate, cobalt oleate, cobalt linoleate, linolein. Examples include cobalt acid, cobalt palmitate, cobalt neodecanoate, cobalt rosinate, cobalt tall oilate, and cobalt trineodecanoate. The blending amount of the organic acid cobalt is preferably less than 0.05 parts by weight, more preferably 0.01 to 0.04 parts by weight in terms of cobalt. When the amount of cobalt exceeds 0.05 parts by weight, processability is deteriorated and physical properties of the vulcanized rubber are remarkably lowered.
また、本発明のタイヤトレッド用ゴム組成物に配合する補強剤としては、特に、窒素吸着比表面積(N2SA)が70m2/g以上、好ましくは90〜150m2/gのカーボンブラック及び/又はシリカを合計で30〜80重量部の量で用いられることが好ましい。当該カーボンブラックとして、窒素吸着比表面積(N2SA)が70m2/g以上のものを使用することは、重荷重タイヤとした場合にその耐摩耗性を向上させるなどの理由で好ましい。 As the reinforcing agent to be blended in the rubber composition for a tire tread of the present invention, in particular, nitrogen adsorption specific surface area (N 2 SA) of 70m 2 / g or more, preferably 90~150m 2 / g carbon black and / Alternatively, it is preferable to use silica in an amount of 30 to 80 parts by weight in total. The use of carbon black having a nitrogen adsorption specific surface area (N 2 SA) of 70 m 2 / g or more is preferable for improving the wear resistance when a heavy-duty tire is used.
本発明のタイヤトレッド用ゴム組成物には、他の配合剤として、加硫又は架橋剤、加硫又は架橋促進剤、各種オイル、シランカップリング剤、老化防止剤、可塑剤、充填剤など、一般のタイヤ用に配合されている各種配合剤及び添加剤が配合され、かかる配合剤及び添加剤の配合量も、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 the tire tread rubber composition of the present invention, as other compounding agents, vulcanization or crosslinking agent, vulcanization or crosslinking accelerator, various oils, silane coupling agent, anti-aging agent, plasticizer, filler, etc. Various compounding agents and additives compounded for general tires are compounded, and the compounding amounts of such compounding agents and additives may be the conventional general compounding amounts unless they are contrary to the object of the present invention. it can.
以下、実施例及び比較例によって本発明を更に説明するが、本発明の技術的範囲をこれらの実施例によって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 further demonstrated by an Example and a comparative example, it cannot be overemphasized that the technical scope of this invention is not limited by these Examples.
試験サンプルの作製
以下の表1に示す加硫促進剤と硫黄を除く各成分を1.8Lの密閉型ミキサーで3〜5分間混練し、165±5℃に達した時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、148℃の温度下、30分間プレス加硫して破断時伸びの測定用試験片(ゴムシート)を作製した。同様にして、硬さ測定用の金型を用いて、厚さ12.7mm、直径29.0mmの円柱形の試験体を作製した。耐カット性の測定用試験体は、上面9.5cm×9.5cm、下面10.6cm×10.6cm、高さ3.9cmの金型中で、148℃の温度下、60分間プレス加硫して作製した。
Preparation of test sample Each component excluding vulcanization accelerator and sulfur shown in Table 1 below was kneaded for 3 to 5 minutes in a 1.8 L closed mixer and added to the master batch released when it reached 165 ± 5 ° C. The sulfur accelerator and sulfur were kneaded with an 8-inch open roll to obtain a rubber composition. Next, this rubber composition was press vulcanized for 30 minutes at a temperature of 148 ° C. in a 15 cm × 15 cm × 0.2 cm mold to prepare a test piece for measuring elongation at break (rubber sheet). Similarly, a cylindrical specimen having a thickness of 12.7 mm and a diameter of 29.0 mm was produced using a mold for hardness measurement. The test specimen for measuring cut resistance was press vulcanized for 60 minutes at a temperature of 148 ° C. in a mold having an upper surface of 9.5 cm × 9.5 cm, a lower surface of 10.6 cm × 10.6 cm and a height of 3.9 cm. And produced.
試験方法
1)硬さ:JIS K 6253に準拠して、スプリング式A型硬さ試験機を用いて、厚さ12.7mm、直径29.0mmの円柱形の試験体の硬さを測定した。結果は、比較例1を100として、指数で表示した。数値が大きい程、良好であることを示す。
2)破断時伸び(EB):JIS K 6251に準拠して、上記試験サンプルからJIS3号ダンベルにて2mmのゴムシートを打ち抜き、500mm/分の引張速度の条件下で、EBを得た。結果は、比較例1を100として、指数で表示した。数値が大きい程、良好であることを示す。
3)耐カット性:15cmの高さから荷重49Nの針(先端角度90°、径4mmφ)をゴム試料片へ落下させ、針入深さを測定した。針入深さが小さい方が耐カット性は高く良好である。結果は、比較例1を100として、指数で表示した。数値が大きい程、良好であることを示す。
Test Method 1) Hardness: Based on JIS K 6253, the hardness of a cylindrical specimen having a thickness of 12.7 mm and a diameter of 29.0 mm was measured using a spring type A hardness tester. The results were expressed as an index with Comparative Example 1 as 100. It shows that it is so favorable that a numerical value is large.
2) elongation at break (E B): in compliance with JIS K 6251, punched 2mm rubber sheet at JIS3 dumbbell from the test sample, at a tensile rate conditions of 500 mm / min, to obtain a E B . The results were expressed as an index with Comparative Example 1 as 100. It shows that it is so favorable that a numerical value is large.
3) Cut resistance: A needle with a load of 49 N (tip angle 90 °, diameter 4 mmφ) was dropped from a height of 15 cm onto a rubber sample piece, and the needle penetration depth was measured. The smaller the penetration depth, the better the cut resistance. The results were expressed as an index with Comparative Example 1 as 100. It shows that it is so favorable that a numerical value is large.
実施例1〜2及び比較例1〜4
結果を、以下の表1に示す。
The results are shown in Table 1 below.
表1の結果から、比較例2では、銅粉のみを配合すると硬さは大きくなるが、破断時伸びが低下するので、耐カット性は向上しないことが判る。比較例3では、ナフテン酸コバルトのみを配合すると硬さと破断時伸びの両方が大きくなり、耐カット性も向上するが、その効果は本発明のものほどではないことが判る。比較例4では、銅粉とナフテン酸コバルトを併用しているが、両者の配合量が多過ぎるため、破断時伸びが低下して耐カット性は改善されないことが判る。これに対して、本発明の実施例1及び2では、所定量の銅粉とナフテン酸コバルトを併用すると、硬さと破断時伸びの両方が大きくなり、耐カット性が著しく向上することが判る。 From the results in Table 1, it can be seen that in Comparative Example 2, the hardness increases when only copper powder is blended, but the elongation at break decreases, so that the cut resistance is not improved. In Comparative Example 3, when only cobalt naphthenate is blended, both hardness and elongation at break increase, and the cut resistance is improved, but the effect is not as good as that of the present invention. In Comparative Example 4, copper powder and cobalt naphthenate are used in combination, but since the blending amount of both is too large, it is understood that the elongation at break is reduced and the cut resistance is not improved. On the other hand, in Example 1 and 2 of this invention, when a predetermined amount of copper powder and cobalt naphthenate are used together, it turns out that both hardness and elongation at break increase and the cut resistance is remarkably improved.
よって、本発明のタイヤトレッド用ゴム組成物は、これをタイヤトレッド部に使用した重荷重用タイヤとすれば、極めて有用である。 Therefore, the rubber composition for a tire tread of the present invention is extremely useful if it is a heavy duty tire using the tire tread portion.
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JP2005149484A JP2006328107A (en) | 2005-05-23 | 2005-05-23 | Rubber composition for tire tread |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008303330A (en) * | 2007-06-08 | 2008-12-18 | Sumitomo Rubber Ind Ltd | Rubber composition for base tread and pneumatic tire using the same |
JP2009013223A (en) * | 2007-07-02 | 2009-01-22 | Sumitomo Rubber Ind Ltd | Rubber composition for base tread, base tread, and tire |
KR101356565B1 (en) | 2011-07-28 | 2014-01-28 | 한국타이어 주식회사 | rubber composition for tire tread and tire manufactured by using the same |
-
2005
- 2005-05-23 JP JP2005149484A patent/JP2006328107A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008303330A (en) * | 2007-06-08 | 2008-12-18 | Sumitomo Rubber Ind Ltd | Rubber composition for base tread and pneumatic tire using the same |
JP2009013223A (en) * | 2007-07-02 | 2009-01-22 | Sumitomo Rubber Ind Ltd | Rubber composition for base tread, base tread, and tire |
KR101356565B1 (en) | 2011-07-28 | 2014-01-28 | 한국타이어 주식회사 | rubber composition for tire tread and tire manufactured by using the same |
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