JP2915532B2 - Rubber composition for tire tread - Google Patents
Rubber composition for tire treadInfo
- Publication number
- JP2915532B2 JP2915532B2 JP2258151A JP25815190A JP2915532B2 JP 2915532 B2 JP2915532 B2 JP 2915532B2 JP 2258151 A JP2258151 A JP 2258151A JP 25815190 A JP25815190 A JP 25815190A JP 2915532 B2 JP2915532 B2 JP 2915532B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber composition
- low
- temperature
- tire tread
- carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 125000003118 aryl group Chemical group 0.000 claims description 8
- 239000010734 process oil Substances 0.000 claims description 8
- 230000032683 aging Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000010690 paraffinic oil Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明はオールシーズンタイヤ、スタッドレスタイ
ヤ等に用いられるタイヤトレッド用ゴム組成物におい
て、特にその低温特性及びウェット路面での耐すべり抵
抗性の改良に関する。The present invention relates to a rubber composition for a tire tread used for all-season tires, studless tires, and the like, and particularly to an improvement in low-temperature characteristics and slip resistance on a wet road surface. About.
［従来の技術］ 従来よりこの種のトレッド用ゴム組成物には、低温性
能を改良し、氷雪路での制動性を向上させるため、ナフ
テン系もしくはパラフィン系炭素の含有量の大きいプロ
セスオイルが用いられ、また低温可塑剤が用いられてい
た。[Prior Art] Conventionally, a process oil having a large content of naphthenic or paraffinic carbon has been used in this type of tread rubber composition in order to improve low-temperature performance and improve braking performance on icy and snowy roads. And low temperature plasticizers have been used.
［発明が解決しようとする課題］ しかしナフテン系もしくはパラフィン系プロセスオイ
ルを用いると、氷雪路での制動性は向上する反面、ヒス
テリシスロスが少なくなることから、ウェット路面での
すべり抵抗が低下する問題があり、低温特性とウェット
路面での耐すべり抵抗性とは二律背反特性であった。[Problems to be Solved by the Invention] However, when a naphthenic or paraffinic process oil is used, the braking performance on icy roads is improved, but the hysteresis loss is reduced, and the slip resistance on wet road surfaces is reduced. The low-temperature characteristics and the anti-slip resistance on wet road surfaces were the trade-off characteristics.
また一般的に低温可塑剤を用いると、使用に伴い他部
材への移行と蒸散等により経時的に硬化し、初期の低温
特性を維持できない問題があった。Generally, when a low-temperature plasticizer is used, it hardens with the lapse of time due to transfer to another member and evaporation due to use, and there is a problem that the initial low-temperature characteristics cannot be maintained.
この発明の目的は二律背反する氷雪路での制動性とウ
ェット路面での制動性の両特性を同時に発揮することが
でき、しかも経時的にも初期の低温性能の低下を防止し
て氷雪路での制動性を維持することができるタイヤトレ
ッド用ゴム組成物を提供する点にある。It is an object of the present invention to simultaneously exhibit both characteristics of braking performance on ice and snow roads, which are contrary to each other, and braking performance on wet road surfaces. An object of the present invention is to provide a rubber composition for a tire tread that can maintain braking performance.
［課題を解決するための手段］ 上記目的を達成するため鋭意検討した結果、この発明
は低温特性の改良効果のあるナフテン系もしくはパラフ
ィン系炭素を主成分としつつも、さらに低温特性を阻害
せずにウェット路面での耐すべり抵抗性の向上を図るた
めに、アロマチック系炭素を最少限度の範囲である10〜
25％の配合量に押え、しかも分子量の指標となる動粘度
（40℃）が100〜1000cstであるプロセスオイルを用いた
タイヤトレッド用ゴム組成物を採用した。[Means for Solving the Problems] As a result of intensive studies to achieve the above object, the present invention has a naphthene-based or paraffin-based carbon having an effect of improving low-temperature characteristics as a main component, but does not impair the low-temperature characteristics. In order to improve the slip resistance on wet road surfaces, use aromatic carbon in the minimum range of 10 to
A rubber composition for a tire tread using a process oil having a kinetic viscosity (40 ° C.) of 100 to 1000 cst, which is an index of the molecular weight, which is suppressed to a compounding amount of 25%, was employed.
［作用］ 従って氷雪路での制動性とウェット路面での耐すべり
特性が同時に発揮され、かつ低温特性における耐老化性
が改良される。[Operation] Accordingly, the braking performance on ice and snow and the anti-slip properties on wet roads are simultaneously exhibited, and the aging resistance in low-temperature properties is improved.
ただ、動粘度が100cst未満ではヒステリシスロスが少
なく、ウェット路面での制動性が劣り、またタイヤの他
部材への移行や外部への蒸散によるトレッドゴムの経時
的な硬度上昇が大きく、低温性能を維持することが困難
である。一方、動粘度が1000cstを越えると低温性能の
改良効果が乏しくなる。また比較的スチレン量の多いSB
R1502などのポリマー系で用いるとブリード現象が生
じ、好ましくない。またアロマチック系炭素が10％未満
では従来のナフテン系またはパラフィン系のオイルと変
わらなくなり、ヒステリシスロスが少なく、ウェット路
面での制動性が乏しくなる。アロマチック系炭素が25％
を越えると低温性能の改良効果が乏しく、オールシーズ
ンタイヤまたはスタッドレスタイヤとしては適当ではな
い。However, if the kinematic viscosity is less than 100 cst, the hysteresis loss is small, braking performance on wet road surfaces is inferior, and the hardness of the tread rubber over time due to transfer to other parts of the tire and evaporation to the outside is large, and low temperature performance is low. Difficult to maintain. On the other hand, if the kinematic viscosity exceeds 1000 cst, the effect of improving the low-temperature performance becomes poor. SB with relatively high styrene content
When used in a polymer system such as R1502, a bleed phenomenon occurs, which is not preferable. If the amount of the aromatic carbon is less than 10%, it is no different from the conventional naphthenic or paraffinic oil, the hysteresis loss is small, and the braking performance on wet road surface is poor. 25% aromatic carbon
If the temperature exceeds, the effect of improving low-temperature performance is poor, and it is not suitable as an all-season tire or a studless tire.
［実施例］ SBR（スチレン含量18％）100重量部に、N339カーボン
80重量部、プロセスオイル50重量部、ZnOが３重量部、
ステアリン酸２重量部、老化防止剤6C（Ｎ−フェニル−
Ｎ′−（1,3ジメチルブチル）−Ｐ−フェニレンジアミ
ン）２重量部、促進剤CZが1.5重量部、硫黄２重量部を
ゴム組成物として配合し、実際のタイヤのシュミレート
サンプルを試作した。プロセスオイルは第１表に示す通
り、主成分としてのナフテン系炭素（CN）及びパラフィ
ン系炭素（CP）にアロマチック系炭素（CA）を加えたタ
イプとし、所定の動粘度となるように調整している。[Example] N339 carbon was added to 100 parts by weight of SBR (styrene content 18%).
80 parts by weight, 50 parts by weight of process oil, 3 parts by weight of ZnO,
2 parts by weight of stearic acid, antioxidant 6C (N-phenyl-
2 parts by weight of N '-(1,3 dimethylbutyl) -P-phenylenediamine, 1.5 parts by weight of accelerator CZ, and 2 parts by weight of sulfur were blended as a rubber composition, and a simulation sample of an actual tire was prepared. As shown in Table 1, the process oil is a type in which aromatic carbon (C A ) is added to naphthenic carbon (C N ) and paraffinic carbon (C P ) as the main components, and has a predetermined kinematic viscosity. Is adjusted as follows.
これらについて初期硬度及び老化後の硬度変化と、ポ
ータブルウェットスキッドレジスタンス（Ｐ−WET S.
R）について測定した。その結果を第１表に示す。なお
ポータブルウェットスキッドレジスタンスは英国のスタ
ンレーロンドン社製のポータブルスキッドテスターを用
い、表面を水で濡らしたセーフティーウォーク路面（住
友3M社製）上で室温にて滑り抵抗を測定した。測定値は
ナフテン系もしくはパラフィン系炭素を主成分とする従
来のプロセスオイルを用いた比較例７を100とした指数
値で示し、値が大きいほどウェット路面での耐すべり特
性が好ましいことを示している。For these, changes in initial hardness and hardness after aging, and portable wet skid resistance (P-WET S.
R) was measured. Table 1 shows the results. The portable wet skid resistance was measured at room temperature on a safety walk road (Sumitomo 3M) whose surface was wetted with water using a portable skid tester manufactured by Stanley London, UK. The measured value is shown as an index value when the value of Comparative Example 7 using a conventional process oil containing a naphthenic or paraffinic carbon as a main component is set to 100, and the larger the value, the better the slip resistance on a wet road surface. I have.
第１表に示す通り、アロマチィック炭素が10％未満の
場合ではウェット路面での耐すべり特性が乏しくなり、
25％を越えると低温特性の改良効果が乏しくなることが
認められる。また動粘度が100cst未満の場合ではウェッ
ト路面での耐すべり特性が低下し、また老化経時変化が
大きい。動粘度が1000cstを越えると低温性能の低下が
認められる。As shown in Table 1, when the amount of aromatic carbon is less than 10%, the slip resistance on a wet road surface is poor,
When it exceeds 25%, it is recognized that the effect of improving the low-temperature characteristics becomes poor. If the kinematic viscosity is less than 100 cst, the slip resistance on a wet road surface deteriorates, and the aging change is large. When the kinematic viscosity exceeds 1000 cst, a decrease in low-temperature performance is observed.
これに対し実施例１〜３では低温時での性能が良好
で、氷雪路での制動性が期待できると同時に、老化後の
硬度の経時変化も少なく、老化後も氷雪路での制動性が
十分保持できることが認められる。またウェット路面で
の耐すべり特性も良好である。 On the other hand, in Examples 1 to 3, the performance at low temperatures is good, and braking performance on icy and snowy roads can be expected. At the same time, there is little change over time in hardness after aging, and braking performance on icy and snowy roads after aging is also good. It is recognized that it can be held sufficiently. Also, the anti-slip properties on wet road surfaces are good.
［発明の効果］ 以上の通りこの発明は、ナフテン系またはパラフィン
系炭素を主としつつ、アロマチック系炭素を一定量の範
囲内で含ませ、かつ動粘度を調整したプロセスオイルを
用いたゴム組成物であるので、氷雪路での制動性とウェ
ット路面での耐すべり特性が同時に発揮され、かつ低温
特性における耐老化性が改良され、オールシーズンタイ
ヤ、スタッドレスタイヤのトレッド用ゴム組成物として
好適である。[Effects of the Invention] As described above, the present invention provides a rubber composition using a process oil containing mainly aromatic naphthenic or paraffinic carbon, containing aromatic carbon within a certain amount, and adjusting kinematic viscosity. Since it is a material, it exhibits both braking performance on ice and snow and slip resistance on wet roads, and has improved aging resistance at low temperatures, and is suitable as a rubber composition for treads of all-season tires and studless tires. is there.
フロントページの続き (56)参考文献 特開 平３−9936（ＪＰ，Ａ) 特開 平２−24334（ＪＰ，Ａ) 特開 平２−265937（ＪＰ，Ａ) 特開 昭64−1744（ＪＰ，Ａ) 特開 昭59−74136（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C08L 7/00 - 21/02 C08L 91/00 Continuation of the front page (56) References JP-A-3-9936 (JP, A) JP-A-2-24334 (JP, A) JP-A-2-265937 (JP, A) JP-A 64-1744 (JP) , A) JP-A-59-74136 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C08L 7/00-21/02 C08L 91/00
Claims (1)
成分とし、アロマチック系炭素を10〜25％含む、動粘度
（40℃）が100〜1000cstであるプロセスオイルを用いた
ことを特徴とするタイヤトレッド用ゴム組成物1. A tire characterized by using a process oil having a kinematic viscosity (40 ° C.) of 100 to 1000 cst, containing naphthenic or paraffinic carbon as a main component, containing 10 to 25% of aromatic carbon. Rubber composition for tread
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2258151A JP2915532B2 (en) | 1990-09-26 | 1990-09-26 | Rubber composition for tire tread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2258151A JP2915532B2 (en) | 1990-09-26 | 1990-09-26 | Rubber composition for tire tread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04136050A JPH04136050A (en) | 1992-05-11 |
| JP2915532B2 true JP2915532B2 (en) | 1999-07-05 |
Family
ID=17316235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2258151A Expired - Fee Related JP2915532B2 (en) | 1990-09-26 | 1990-09-26 | Rubber composition for tire tread |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2915532B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5717328B2 (en) * | 2009-09-29 | 2015-05-13 | 住友ゴム工業株式会社 | Rubber composition for cap tread and studless tire |
-
1990
- 1990-09-26 JP JP2258151A patent/JP2915532B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04136050A (en) | 1992-05-11 |
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