JPH07109383A - Rubber composition for heavy-duty radial tire tread - Google Patents
Rubber composition for heavy-duty radial tire treadInfo
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- JPH07109383A JPH07109383A JP5257070A JP25707093A JPH07109383A JP H07109383 A JPH07109383 A JP H07109383A JP 5257070 A JP5257070 A JP 5257070A JP 25707093 A JP25707093 A JP 25707093A JP H07109383 A JPH07109383 A JP H07109383A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、重荷重ラジアルタイヤ
トレッド用ゴム組成物に関し、更に詳しくは耐摩耗性、
耐カット性及び耐チッピング性のバランスに優れた重荷
重ラジアルタイヤトレッド用ゴム組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition for a heavy load radial tire tread, more specifically abrasion resistance,
The present invention relates to a rubber composition for a heavy load radial tire tread having an excellent balance of cut resistance and chipping resistance.
【０００２】[0002]
【従来の技術】重荷重用ラジアルタイヤに於いては、舗
装路での高速走行、長距離走行などが一般的であるが、
一方では、非舗装路での短距離走行を余儀なくされてい
る場合も少なくないのが現状である。2. Description of the Related Art In radial tires for heavy loads, high-speed traveling on a paved road and long-distance traveling are common.
On the other hand, in the current situation, there are many cases in which a person is forced to travel a short distance on an unpaved road.
【０００３】一般に非舗装路走行用のトレッドゴムは、
耐カット性や耐チッピング性が非常に重要であり、この
ため配合面では、天然ゴムに対し、各種樹脂、ホワイト
カーボン又は低ストラクチャーカーボンブラックなどを
配合するのが効果的である。しかしながら、かかる配合
に於いては、いずれの場合にも舗装路走行における重要
特性である耐摩耗性が悪化するという問題がある。Generally, tread rubbers for running on unpaved roads are
Cut resistance and chipping resistance are very important. Therefore, in terms of compounding, it is effective to compound various resins, white carbon, low structure carbon black or the like with natural rubber. However, in any of these cases, there is a problem that the wear resistance, which is an important characteristic in running on a paved road, deteriorates.
【０００４】[0004]
【発明が解決しようとする課題】従って、本発明は、非
舗装路走行における、重要な特性である耐カット性及び
耐チッピング性に優れ、しかも舗装路走行における重要
な特性である耐摩耗性の特性のバランスに優れた重荷重
ラジアル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。Therefore, the present invention has excellent cut resistance and chipping resistance, which are important characteristics in running on a non-paved road, and wear resistance, which is an important characteristic in running on a paved road. An object of the present invention is to provide a rubber composition for a heavy load radial tire tread having an excellent balance of properties.
【０００５】[0005]
【課題を解決するための手段】本発明に従えば、（ｉ）
（ａ）天然ゴム又は（ｂ）天然ゴム７０重量部以上とジ
エン系ゴム３０重量部以下とをブレンドしたゴム１００
重量部、（ii）ＣＴＡＢ吸着比表面積が１３０〜１７０
m2／ｇ、２４Ｍ４ＤＢＰ吸油量が８０〜９５ml／１００
ｇで、かつ波長３４２nmに於けるトルエン着色透過度が
７５％以下の範囲にあるカーボンブラック３０〜７０重
量部及び（iii)フェノール系熱硬化性樹脂１〜８重量部
を配合してなる重荷重ラジアルタイヤトレッド用ゴム組
成物が提供される。According to the present invention, (i)
(A) Natural rubber or (b) Rubber 100 blended with 70 parts by weight or more of natural rubber and 30 parts by weight or less of diene rubber
Parts by weight, (ii) CTAB adsorption specific surface area is 130 to 170
m 2 / g, 24M4DBP oil absorption of 80~95ml / 100
g, and 30 to 70 parts by weight of carbon black having a transmittance of 75% or less for coloring with toluene at a wavelength of 342 nm and (iii) 1 to 8 parts by weight of a phenolic thermosetting resin are mixed in a heavy load. A rubber composition for a radial tire tread is provided.
【０００６】以下、本発明の構成及びその作用効果につ
いて詳しく説明する。本発明に従えば、前述の如く、
（ｉ）（ａ）天然ゴム又は（ｂ）天然ゴム６０重量部以
上、好ましくは７０重量部以上とポリイソプレンゴムも
しくはその他のジエン系ゴムを４０重量部以下、好まし
くは３０重量部以下ブレンドしたゴム１００重量部、
（ii）ＣＴＡＢ吸着比表面積が１３０〜１７０m2／ｇ、
好ましくは１３５〜１６５m2／ｇ、２４Ｍ４ＤＢＰ吸油
量が８０〜９５ml／１００ｇ、好ましくは８５〜９５ml
／１００ｇで、かつ波長３４２nmに於けるトルエン着色
透過度が７５％以下、好ましくは７０％以下の範囲にあ
るカーボンブラック３０〜７０重量部、好ましくは３５
〜６５重量部並びに（iii)フェノール系熱硬化性樹脂、
特にｍ−クレゾール分を５０重量％以上含むフェノール
化合物の熱硬化性樹脂１〜８重量部、好ましくは２〜６
重量部を配合する。The structure of the present invention and its function and effect will be described in detail below. According to the present invention, as described above,
(I) (a) Natural rubber or (b) Natural rubber 60 parts by weight or more, preferably 70 parts by weight or more and polyisoprene rubber or other diene rubber are blended in 40 parts by weight or less, preferably 30 parts by weight or less 100 parts by weight,
(Ii) CTAB adsorption specific surface area of 130 to 170 m 2 / g,
Preferably 135-165 m 2 / g, 24M4DBP oil absorption is 80-95 ml / 100g, preferably 85-95 ml
30 to 70 parts by weight, preferably 35, of 100% / 100 g of carbon black having a transmittance of 75% or less, preferably 70% or less, for toluene coloring at a wavelength of 342 nm.
~ 65 parts by weight and (iii) phenolic thermosetting resin,
Particularly, 1 to 8 parts by weight of a thermosetting resin of a phenol compound containing 50% by weight or more of m-cresol, preferably 2 to 6
Mix parts by weight.
【０００７】本発明のゴム組成物のゴム成分としては天
然ゴム単味又は天然ゴムとジエン系ゴム（例えばポリイ
ソプレン、ポリブタジエン、スチレンブタジエン共重合
ゴムなど）のブレンドが用いられる。天然ゴムとジエン
系ゴムとのブレンド比はジエン系ゴムの配合量が多くな
り過ぎると、耐摩耗性、耐カット及びチッピング性の低
下を引き起こすので、天然ゴム６０重量部以上（好まし
くは７０重量部以上）とジエン系ゴム４０重量部以下
（好ましくは３０重量部以下）とする。As the rubber component of the rubber composition of the present invention, natural rubber alone or a blend of natural rubber and a diene rubber (for example, polyisoprene, polybutadiene, styrene-butadiene copolymer rubber) is used. The blending ratio of the natural rubber and the diene rubber causes the abrasion resistance, the cut resistance and the chipping resistance to be deteriorated when the blending amount of the diene rubber is too large. Therefore, the natural rubber is 60 parts by weight or more (preferably 70 parts by weight). Above) and 40 parts by weight or less of diene rubber (preferably 30 parts by weight or less).
【０００８】本発明のゴム組成物に用いるカーボンブラ
ックは前述の通り特定のＣＴＡＢ、２４Ｍ４ＤＢＰ及び
トルエン着色透過度を有するものでなければならない。The carbon black used in the rubber composition of the present invention must have the specified CTAB, 24M4DBP and toluene color transmission as described above.
【０００９】本発明のゴム組成物に配合するカーボンブ
ラックのＣＴＡＢ（セチルトリメチルアンモニウムブロ
マイドの吸着量から算出したカーボンブラック単位重量
当りの表面積m2／ｇ）（ＡＳＴＭ Ｄ３７６５−８０の
方法に準拠して測定）が１３０m2／ｇ未満では、十分な
耐摩耗性が得られず、逆に１７０m2／ｇを超えると、混
合時の加工性が低下するので好ましくない。又、２４Ｍ
４ＤＢＰ吸油量（ＡＳＴＭ Ｄ３４９３の方法に準拠し
て測定）が８０ml／１００ｇ未満では、混合加工性が著
しく低下し、また耐摩耗性も低下するので好ましくな
く、逆に９５ml／１００ｇを超えると、耐チッピング性
が低下するので好ましくない。更に、本発明のゴム組成
物に配合するカーボンブラックのトルエン着色透過度が
７５％を超えると、カーボンブラックの活性が低下し、
フェノール系熱硬化性樹脂との組合せによって得られる
相乗効果が小さくなるので好ましくない。CTAB of carbon black compounded in the rubber composition of the present invention (surface area per unit weight of carbon black m 2 / g calculated from the adsorption amount of cetyltrimethylammonium bromide) (based on the method of ASTM D3765-80). If the measured value) is less than 130 m 2 / g, sufficient abrasion resistance cannot be obtained, and conversely, if it exceeds 170 m 2 / g, the workability during mixing deteriorates, which is not preferable. Also, 24M
If the 4DBP oil absorption (measured according to the method of ASTM D3493) is less than 80 ml / 100 g, the mixing processability is significantly deteriorated and the abrasion resistance is also deteriorated, which is not preferable. It is not preferable because the chipping property is deteriorated. Further, when the toluene coloring transmittance of the carbon black compounded in the rubber composition of the present invention exceeds 75%, the activity of the carbon black decreases,
It is not preferable because the synergistic effect obtained by the combination with the phenolic thermosetting resin becomes small.
【００１０】本発明のゴム組成物には第三の必須成分と
してフェノール系熱硬化性樹脂がゴム１００重量部に対
し１〜８重量部、好ましくは２〜６重量部配合される。
本発明に用いるフェノール系熱硬化性樹脂としては、ク
レゾール、フェノール、レゾルシンなどのフェノール類
とホルムアルデヒドなどのアルデヒド類との縮合樹脂な
どがあげられ、特に反応性が高い点からフェノール化合
物としてｍ−クレゾールを５０重量％以上含むものが好
ましい。The rubber composition of the present invention contains a phenolic thermosetting resin as a third essential component in an amount of 1 to 8 parts by weight, preferably 2 to 6 parts by weight, based on 100 parts by weight of the rubber.
Examples of the phenolic thermosetting resin used in the present invention include condensation resins of phenols such as cresol, phenol and resorcin with aldehydes such as formaldehyde. Particularly, m-cresol is a phenol compound because of its high reactivity. Is preferably 50% by weight or more.
【００１１】本発明のゴム組成物の配合において、ゴム
分１００重量部に対し、フェノール系熱硬化性樹脂の配
合量が１重量部未満では、耐カット性や耐チッピング性
の改良効果が小さく、逆に８重量部を超えると、耐摩耗
性や発熱性が低下するので好ましくない。In the compounding of the rubber composition of the present invention, when the compounding amount of the phenolic thermosetting resin is less than 1 part by weight with respect to 100 parts by weight of the rubber content, the effect of improving the cut resistance and chipping resistance is small, On the other hand, if it exceeds 8 parts by weight, abrasion resistance and heat generation property are deteriorated, which is not preferable.
【００１２】本発明のタイヤトレッド用ゴム組成物には
前記ポリマー分及びカーボンブラックに加えて、硫黄、
加硫促進剤、老化防止剤、充填剤、軟化剤、可塑剤など
のタイヤ用に一般に配合されている各種添加剤を配合す
ることができ、かかる配合物は一般的な方法で加硫して
タイヤトレッドを製造することができる。これらの添加
剤の配合量も一般的な量とすることができる。例えば、
硫黄の配合量はゴム分１００重量部当り１．２重量部以
上が好ましく、１．５〜３．０重量部とするのが更に好
ましい。In the rubber composition for a tire tread of the present invention, in addition to the polymer content and carbon black, sulfur,
Various additives commonly used for tires such as vulcanization accelerators, antioxidants, fillers, softeners, and plasticizers can be added, and such compounds are vulcanized by a general method. Tire treads can be manufactured. The compounding amount of these additives may be a general amount. For example,
The amount of sulfur blended is preferably 1.2 parts by weight or more, and more preferably 1.5 to 3.0 parts by weight, based on 100 parts by weight of the rubber component.
【００１３】[0013]
【実施例】以下、実施例及び比較例に従って本発明を更
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。実施
例１〜４及び比較例１〜７ 表Ｉに示す配合内容（重量部）でそれぞれの成分を配合
し、加硫促進剤と硫黄 を除く原料ゴム及び配合剤を１．７リットルのバンバリ
ーミキサーで５分間混合した後、この混合物に加硫促進
剤と硫黄とを８インチの試験用練りロール機で４分間混
練し、ゴム組成物を得た。これらのゴム組成物を１６０
℃で２５分間プレス加硫して、目的とする試験片を調製
し、各種試験を行い、その物性を測定した。得られた加
硫物の物性は表Ｉに示す通りである。なお、以下の例に
用いた各評価の測定方法は次のとおりである。The present invention will be described in more detail below with reference to Examples and Comparative Examples, but it goes without saying that the technical scope of the present invention is not limited to these Examples. Implementation
Examples 1 to 4 and Comparative Examples 1 to 7 Ingredients (parts by weight) shown in Table I were blended together to prepare a vulcanization accelerator, raw material rubber excluding sulfur, and a blending agent in a 1.7-liter Banbury mixer. After mixing for 5 minutes, a vulcanization accelerator and sulfur were kneaded with this mixture for 4 minutes with an 8-inch test kneading roll machine to obtain a rubber composition. 160% of these rubber compositions
A target test piece was prepared by press vulcanization at 25 ° C. for 25 minutes, various tests were performed, and the physical properties thereof were measured. The physical properties of the obtained vulcanizate are shown in Table I. The measuring methods for each evaluation used in the following examples are as follows.
【００１４】カット性 縦１００mm、横１００mm及び高さ４０mmのゴム片に、先
端の角度９０°、長さ４０mm及び径４mmの針を高さ１５
cmから荷重３kgで落下させ、針のささった深さを測定
し、指数表示した（指数が大きいほど耐カット性は良
好）。[0014] cuttability vertical 100mm, the rubber piece of transverse 100mm and height of 40mm, a height angle 90 ° tip, the needle length 40mm and diameter 4 mm 15
It was dropped from cm with a load of 3 kg, and the depth at which the needle touched was measured and displayed as an index (the larger the index, the better the cut resistance).
【００１５】チッピング性 外径１６０mm、内径１００mm及び厚さ４０mmのドーナツ
状ゴムサンプルを用い、サンプル老化（１００℃×１週
間）後、フラットドラムに圧力１kg及びスリップ率８０
％で回転させてチッピングを発生させ、その発生数を指
数化して表示した（指数が大きいほど耐チッピング性は
良好）。 Chipping property Using a doughnut-shaped rubber sample having an outer diameter of 160 mm, an inner diameter of 100 mm and a thickness of 40 mm, after aging the sample (100 ° C. × 1 week), a pressure of 1 kg was applied to a flat drum and a slip ratio of 80.
The number of occurrences was indexed and displayed (the larger the index, the better the chipping resistance).
【００１６】摩耗性 ランボーン摩耗試験機によって、試験片円盤と研摩円盤
とを角度をつけずに接触回転させ（この時、試験片との
間に２５％のスリップを生じさせた）、単位時間当りの
試験片の摩耗量を測定し、その値を指数化して表示した
（指数が大きいほど耐摩耗性は良好）。 Abrasion resistance Lambourn abrasion tester was used to rotate the test piece disk and the abrasive disk in contact with each other without making an angle (at this time, 25% slip was caused between the test piece disk and the abrasive disk), and per unit time The wear amount of the test piece was measured, and the value was indexed and displayed (the larger the index, the better the wear resistance).
【００１７】引張り試験 ＪＩＳ Ｋ６３０１に準拠して測定した。 Tensile test Measured according to JIS K6301.
【００１８】カーボンブラックの特性 ＣＴＡＢ：ＡＳＴＭ−Ｄ３７６５−８０により測
定。 ２４Ｍ４ＤＢＰ：ＡＳＴＭ−Ｄ−３４９３１により
測定。 トルエン着色透過度：ＪＩＳ Ｋ６２２１において
波長３４２nmとして測定。 Characteristics of carbon black CTAB: Measured according to ASTM-D3765-80. 24M4DBP: measured by ASTM-D-34931. Toluene color transmission: Measured according to JIS K6221 at a wavelength of 342 nm.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【表２】 [Table 2]
【００２１】表Ｉの脚注 （１）ＲＳＳ ＃３ （２）Ｎｉｐｏｌ ＢＲ １２２０（日本ゼオン製） （３）亜鉛華３号（正同化学製） （４）ノクラック ６Ｃ（大内新興化学製） （５）サンノック（大内新興化学製） （６）ｍ−クレゾールホルムアルデヒド縮合樹脂（スミ
カノール６１０ 住友化学工業製） （７）Ｓａｎｔｏｃｕｒｅ ＮＳ（モンサント製） 評価カーボン特性一覧 ─────────────────────────────────── ＣＴＡＢ 24M4DBP トルエン着色透過度 (m2/g) (ml/100g) (％) ─────────────────────────────────── ＣＢ−Ａ シースト９ １３２ ９５ ８９ ─────────────────────────────────── ＣＢ−Ｂ １６１ ９３ ４５ ─────────────────────────────────── ＣＢ−Ｃ １４６ ９４ ４９ ─────────────────────────────────── Footnotes to Table I (1) RSS # 3 (2) Nipol BR 1220 (manufactured by Zeon Corporation) (3) Zinc Hua No. 3 (manufactured by Shodo Kagaku) (4) Nocrac 6C (manufactured by Ouchi Shinko Kagaku) ( 5) Sunnock (manufactured by Ouchi Shinko Chemical) (6) m-cresol formaldehyde condensation resin (Sumikanol 610 manufactured by Sumitomo Chemical Co., Ltd.) (7) Santocure NS (manufactured by Monsanto) List of evaluated carbon characteristics ─────────── ───────────────────────── CTAB 24M4DBP Toluene color transmission (m 2 / g) (ml / 100g) (%) ───── ────────────────────────────── CB-A SEAST 9 132 95 95 89 ───────────── ─────────────────────── CB-B 161 93 45 ──── ─────────────────────────────── CB-C 146 94 49 ───────────── ──────────────────────
【００２２】[0022]
【発明の効果】表Ｉの結果から明らかなように、本発明
のゴム組成物は、カーボンブラックＣＢ−Ｂとの併用に
よる相乗効果により、耐カット性及び耐チッピング性が
著しく向上し、かつ、耐摩耗性に於いても優れた性能を
示す。但しトルエン着色透過度７０％を超えるカーボン
ブラックと併用した場合には、耐カット性及び耐チッピ
ング性に対する改善効果は小さい。なお、以上の結果
は、天然ゴム／ポリブタジエン ８０／２０の様な他の
ジエン系ゴムとのブレンド系に於いても同様であった。As is clear from the results of Table I, the rubber composition of the present invention has a significantly improved cut resistance and chipping resistance due to the synergistic effect of the combined use with carbon black CB-B, and It also has excellent wear resistance. However, when used in combination with carbon black having a toluene color transmission of more than 70%, the effect of improving cut resistance and chipping resistance is small. The above results were the same in a blend system with another diene rubber such as natural rubber / polybutadiene 80/20.
Claims (1)
ム７０重量部以上とジエン系ゴム３０重量部以下とをブ
レンドしたゴム１００重量部、（ii）ＣＴＡＢ吸着比表
面積が１３０〜１７０m2／ｇ、２４Ｍ４ＤＢＰ吸油量が
８０〜９５ml／１００ｇで、かつ波長３４２nmに於ける
トルエン着色透過度が７５％以下の範囲にあるカーボン
ブラック３０〜７０重量部及び（iii)フェノール系熱硬
化性樹脂１〜８重量部を配合してなる重荷重ラジアルタ
イヤトレッド用ゴム組成物。1. (i) 100 parts by weight of a rubber obtained by blending (a) natural rubber or (b) 70 parts by weight or more of natural rubber and 30 parts by weight or less of diene rubber, and (ii) CTAB adsorption specific surface area of 130-. 170 m 2 / g, 24M4 DBP oil absorption 80 to 95 ml / 100 g, and 30 to 70 parts by weight of carbon black having a toluene coloring transmittance of 75% or less at a wavelength of 342 nm and (iii) phenolic thermosetting A rubber composition for a heavy load radial tire tread, which comprises 1 to 8 parts by weight of a resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25707093A JP3278506B2 (en) | 1993-10-14 | 1993-10-14 | Rubber composition for heavy load radial tire tread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25707093A JP3278506B2 (en) | 1993-10-14 | 1993-10-14 | Rubber composition for heavy load radial tire tread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07109383A true JPH07109383A (en) | 1995-04-25 |
| JP3278506B2 JP3278506B2 (en) | 2002-04-30 |
Family
ID=17301332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25707093A Expired - Fee Related JP3278506B2 (en) | 1993-10-14 | 1993-10-14 | Rubber composition for heavy load radial tire tread |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3278506B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7196129B2 (en) | 1998-12-22 | 2007-03-27 | Pirelli Pneumatici S.P.A. | Vulcanizing system, rubber composition including the vulcanizing system, tread for a vehicle tire including the rubber composition, and tire including the tread |
| US7657412B2 (en) | 2001-03-29 | 2010-02-02 | Honda Giken Kogyo Kabushiki Kaisha | Method of and apparatus for displaying structure optimizing result |
| JP2012201879A (en) * | 2011-03-28 | 2012-10-22 | Yokohama Rubber Co Ltd:The | Pneumatic tire for heavy load |
| EP4129713A4 (en) * | 2020-03-23 | 2023-09-13 | Bridgestone Corporation | Rubber composition and tire |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237002A (en) * | 1988-07-27 | 1990-02-07 | Toyo Tire & Rubber Co Ltd | Radial tire for heavy load vehicle |
| JPH02286727A (en) * | 1989-04-28 | 1990-11-26 | Bridgestone Corp | Rubber composition |
| JPH05179065A (en) * | 1991-12-27 | 1993-07-20 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
-
1993
- 1993-10-14 JP JP25707093A patent/JP3278506B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237002A (en) * | 1988-07-27 | 1990-02-07 | Toyo Tire & Rubber Co Ltd | Radial tire for heavy load vehicle |
| JPH02286727A (en) * | 1989-04-28 | 1990-11-26 | Bridgestone Corp | Rubber composition |
| JPH05179065A (en) * | 1991-12-27 | 1993-07-20 | Yokohama Rubber Co Ltd:The | Rubber composition for tire tread |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7196129B2 (en) | 1998-12-22 | 2007-03-27 | Pirelli Pneumatici S.P.A. | Vulcanizing system, rubber composition including the vulcanizing system, tread for a vehicle tire including the rubber composition, and tire including the tread |
| US7657412B2 (en) | 2001-03-29 | 2010-02-02 | Honda Giken Kogyo Kabushiki Kaisha | Method of and apparatus for displaying structure optimizing result |
| JP2012201879A (en) * | 2011-03-28 | 2012-10-22 | Yokohama Rubber Co Ltd:The | Pneumatic tire for heavy load |
| EP4129713A4 (en) * | 2020-03-23 | 2023-09-13 | Bridgestone Corporation | Rubber composition and tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3278506B2 (en) | 2002-04-30 |
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