JPH03115336A - Tire rubber composition - Google Patents
Tire rubber compositionInfo
- Publication number
- JPH03115336A JPH03115336A JP25078689A JP25078689A JPH03115336A JP H03115336 A JPH03115336 A JP H03115336A JP 25078689 A JP25078689 A JP 25078689A JP 25078689 A JP25078689 A JP 25078689A JP H03115336 A JPH03115336 A JP H03115336A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- rubber
- carbon black
- rubber composition
- parts
- 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.)
- Pending
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 30
- 239000005060 rubber Substances 0.000 title claims abstract description 30
- 239000000203 mixture Substances 0.000 title claims description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 24
- 239000010439 graphite Substances 0.000 claims abstract description 24
- 239000006229 carbon black Substances 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920003244 diene elastomer Polymers 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 abstract description 12
- 238000005299 abrasion Methods 0.000 abstract description 7
- 238000013329 compounding Methods 0.000 abstract description 4
- 244000043261 Hevea brasiliensis Species 0.000 abstract description 2
- 229920003049 isoprene rubber Polymers 0.000 abstract description 2
- 229920003052 natural elastomer Polymers 0.000 abstract description 2
- 229920001194 natural rubber Polymers 0.000 abstract description 2
- 230000002411 adverse Effects 0.000 abstract 1
- 238000001179 sorption measurement Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 12
- 230000020169 heat generation Effects 0.000 description 11
- 230000007423 decrease Effects 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 241000872198 Serjania polyphylla Species 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000004898 kneading Methods 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
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、タイヤ用ゴム組成物に要求される特性である
耐摩耗性を維持し、かつ、耐摩耗性向上のマイナス要素
である発熱に帰因するゴム組成物の耐久性低下を、熱伝
導性の向上により防止したタイヤ用ゴム組成物に関する
。Detailed Description of the Invention [Industrial Field of Application] The present invention maintains wear resistance, which is a characteristic required of rubber compositions for tires, and also reduces heat generation, which is a negative factor in improving wear resistance. The present invention relates to a rubber composition for tires that prevents a decrease in the durability of the rubber composition due to this by improving thermal conductivity.
Ｃ従来の技術〕
タイヤ用ゴム組成物に対しては、従来より、高寿命化の
要求があり、かかる課題に対して耐摩耗性の向上を図っ
たゴム組成物の採用が一般的に実施されている。C. Prior Art] There has been a demand for longer life for rubber compositions for tires, and in response to this issue, rubber compositions with improved wear resistance have generally been adopted. ing.
この耐摩耗性の向上の手段としては、−殻内に小粒径カ
ーボンブラックの高配合が実施されており、このことは
、例えば、特開昭６１−９１２３４号公報、特開昭６３
−８３１４６号公報、および特開昭６２−２９０７３８
号公報などに記載されている。しかしながら、小粒径カ
ーボンブラックの配合による高補強性、高耐摩耗性の向
上は、相反する特性であるゴム組成物の発熱を増加させ
、製品の耐久性、寿命の低下を生じることとなる。As a means of improving this abrasion resistance, a large amount of small particle size carbon black is incorporated into the shell.
-83146, and JP-A-62-290738
It is stated in the issue bulletin etc. However, improving high reinforcing properties and high abrasion resistance by incorporating small particle size carbon black increases the heat generation of the rubber composition, which is a contradictory characteristic, and causes a decrease in the durability and life of the product.
本発明者らは、カーボンブラック配合系において、その
カーボンブラックの一部をグラファイト（黒鉛）で置換
することで、耐摩耗性、および破断、疲労等の一般物性
を低下させることなく、ゴム組成物の熱伝導度を向上さ
せることが可能となり、このゴム組成物をタイヤのトレ
ッド部に用いた場合にその耐久性が向上することを見い
出した。The present inventors have discovered that by substituting a portion of the carbon black with graphite in a carbon black compounding system, a rubber composition can be created without deteriorating wear resistance and general physical properties such as fracture and fatigue. It has been found that the thermal conductivity of the rubber composition can be improved, and that when this rubber composition is used in the tread of a tire, its durability is improved.
本発明は、タイヤ用ゴム組成物に要求される耐摩耗性を
低下させることなく、タイヤ内部の発熱による熱の外部
への伝達を容易にすることにより、タイヤの耐久性を向
上させたゴム組成物を提供することを目的とする。この
ゴム組成物は、特にタイヤのトレッド部用ゴムとして利
用される。The present invention provides a rubber composition that improves the durability of tires by facilitating the transmission of heat generated inside the tire to the outside without reducing the abrasion resistance required for rubber compositions for tires. The purpose is to provide something. This rubber composition is particularly used as a rubber for the tread portion of tires.
本発明のタイヤ用ゴム組成物は、ジエン系ゴム１００重
量部に対し、窒素比表面積１００ｎ（／ｇ以上のカーボ
ンブラックを４０〜６０重量部、およびグラファイトを
３．０〜５．０重量部配合してなることを特徴とする。The tire rubber composition of the present invention contains 40 to 60 parts by weight of carbon black with a nitrogen specific surface area of 100 n(/g or more) and 3.0 to 5.0 parts by weight of graphite to 100 parts by weight of diene rubber. It is characterized by:
以下、この手段につき詳しく説明する。This means will be explained in detail below.
本発明のゴム組成物を構成するジエン系ゴムとしては、
天然ゴム、イソプレンゴム、ポリブタジェンゴム、スチ
レン−ブタジェン共重合体ゴム等のタイヤ用として使用
されるジエン系ゴムで良い。The diene rubber constituting the rubber composition of the present invention includes:
Diene rubbers used for tires such as natural rubber, isoprene rubber, polybutadiene rubber, and styrene-butadiene copolymer rubber may be used.
本発明では、このジエン系ゴム１００重量部に対し、−
殻内にタイヤのトレッド部に使用されるゴム組成物の構
成成分として用いられる窒素比表面積１００ｎ（／ｇ以
上のカーボンブラックを４０〜６０重量部配合する。In the present invention, for 100 parts by weight of this diene rubber, -
40 to 60 parts by weight of carbon black having a nitrogen specific surface area of 100 n(/g or more), which is used as a component of a rubber composition used in the tread portion of a tire, is blended into the shell.
さらに、本発明では、上記ジエン系ゴム１００重量部に
対し、グラファイトを３．０〜５．０重量部配合する。Furthermore, in the present invention, 3.0 to 5.0 parts by weight of graphite is blended with 100 parts by weight of the diene rubber.
このグラファイトは、粒子径０．５μｍ〜４．５μｍで
あることが好ましい。４．５μｍ超では物性上の低下が
生じる。また、配合量が５．０重量部を超えると物性上
の低下が生しる。This graphite preferably has a particle size of 0.5 μm to 4.5 μm. If it exceeds 4.5 μm, the physical properties will deteriorate. In addition, if the blending amount exceeds 5.0 parts by weight, physical properties will deteriorate.
３．０重量部未満では配合した効果が少ない。このグラ
ファイトとしては、玉状黒鉛、鱗状黒鉛のいずれでも良
い。If the amount is less than 3.0 parts by weight, the effect of the addition will be small. This graphite may be either bead-like graphite or scale-like graphite.
このようにしてなる本発明のゴム組成物には、必要に応
じて、上記の配合剤に加えて、酸化亜鉛、ステアリン酸
、老化防止剤およびオイル等の可塑剤、イオウ等の加硫
剤、加硫促進剤などを適宜配合することができる。The rubber composition of the present invention formed in this manner may optionally contain, in addition to the above-mentioned compounding agents, zinc oxide, stearic acid, an anti-aging agent, a plasticizer such as oil, a vulcanizing agent such as sulfur, etc. A vulcanization accelerator and the like can be appropriately added.
以下に実施例および比較例を示す。Examples and comparative examples are shown below.
実施例、比較例
（１） 第１表に示される配合内容（重量部）でゴム
組成物（実施例１〜８、比較例１〜３）を作製した。こ
のゴム組成物の加硫物性を第１表に示す。ここで各加硫
物性は、各ゴム組成物を混練りし、１４８℃、３８分加
硫して得た加硫物に対して以下の方法で測定した。Examples, Comparative Examples (1) Rubber compositions (Examples 1 to 8, Comparative Examples 1 to 3) were prepared with the formulation contents (parts by weight) shown in Table 1. Table 1 shows the vulcanized physical properties of this rubber composition. Here, each vulcanized physical property was measured by the following method on a vulcanized product obtained by kneading each rubber composition and vulcanizing it at 148° C. for 38 minutes.
■ 引張り物性（Ｍ ３００、ＴＢ−Ｅｅ＋）： ＪＩ
Ｓに６３０１（一般ゴム試験法）に準拠。）１３００は
３００％モジュラスを、Ｔおは切断による引張り強さを
、Ｅｌは切断時の伸びを表わす。■ Tensile properties (M 300, TB-Ee+): JI
Compliant with S.6301 (General Rubber Test Method). )1300 represents the 300% modulus, T represents the tensile strength at cutting, and El represents the elongation at cutting.
■ 耐摩耗性：ランボーン摩耗試験機にて３５％スリッ
プで測定（指数で表示、１００以上で耐摩耗性向上）。■ Abrasion resistance: Measured at 35% slip using a Lambourne abrasion tester (expressed as an index; wear resistance improves when it is 100 or more).
■ 発熱：リュブケ反発弾性の６０℃データを示す（指
数で表示、１００以上で発熱は悪化）。■ Heat generation: Shows the 60°C data of Lübke rebound resilience (displayed as an index; heat generation worsens when it is 100 or more).
■ 疲労性試験：デイマツシャー型疲労試験機にてスト
ローク４０ｎ＋、疲労回数１０５回でのクランク発生状
況を指数化（指数で表示、１００以上で耐疲労性は向上
）。■ Fatigue test: Using a Deimatsuscher type fatigue tester, the crank occurrence status at a stroke of 40n+ and a fatigue count of 105 was expressed as an index (displayed as an index; fatigue resistance improves with a score of 100 or more).
■ 熱伝導度： Ｓｈｏｔｈｅｒｍ ＱＴＭ−Ｄ ＩＩ
迅速熱伝導率計により測定。指数で表示し、１００以上
で熱伝導は向上する。■ Thermal conductivity: Shotherm QTM-D II
Measured using a rapid thermal conductivity meter. It is expressed as an index, and heat conduction improves when it is 100 or more.
耐摩耗性を向上する手段として一般的に用いるカーボン
ブラック配合量を増加した系を第１表に比較例１．２．
３下示す（カーボンブラ・７り５３重量部の配合の場合
を１００の指数で示す）。Comparative Examples 1.2 and 1.2 show systems in which the amount of carbon black added, which is generally used as a means to improve wear resistance, is increased in Table 1.
3 is shown below (the case where 53 parts by weight of Carbon Bra 7-ri is blended is shown as an index of 100).
カーボンブラック配合量の増加により、耐摩耗性は向上
するが、発熱が増加し、また、疲労性が減少しており、
耐久性の点で好ましくない。Increasing the content of carbon black improves wear resistance, but also increases heat generation and decreases fatigue resistance.
Unfavorable in terms of durability.
グラファイトを配合した実施例を実施例１〜６に示す。Examples 1 to 6 show examples in which graphite was blended.
グラファイトは粒径の異なる３種類を、それぞれ、カー
ボンブラック４７．５０．５３重量部の系に配合してい
る。グラファイトは各々３重量部配合した。Three types of graphite with different particle sizes are blended into a system containing 47.50.53 parts by weight of carbon black. Graphite was mixed in an amount of 3 parts by weight.
比較例２と実施例１．２．３を比較した場合、実施例１
．２．３では比較例２に比して、耐摩耗性で優れ、実施
例２．３では疲労性において大幅に優れている。When comparing Comparative Example 2 and Example 1.2.3, Example 1
．． Comparative Example 2.2.3 is superior in wear resistance, and Example 2.3 is significantly superior in fatigue resistance.
カーボンブラックを５０重量部から５３重量部へ増量し
た比較例３と実施例４．５．６と比較する。グラファイ
トの配合により耐摩耗性は同等以上を示し、疲労性につ
いても、粒径が大きくなるにつれて低下するが、カーボ
ンブラックを増量した系以上の値を示す。発熱について
は、カーボンブラックの増量とグラファイトの置換はほ
ぼ同等の増加を示している。熱伝導度については、カー
ボンブラック増量の系（比較例１〜３）に対してグラフ
ァイトを配合した系（実施例１〜６）は全て約５％程度
の向上を示している。Comparative Example 3 in which the amount of carbon black was increased from 50 parts by weight to 53 parts by weight is compared with Example 4.5.6. By adding graphite, the wear resistance is equal to or better than that of the system, and although the fatigue resistance decreases as the particle size increases, it shows a value higher than that of the system containing increased carbon black. Regarding heat generation, increasing the amount of carbon black and replacing graphite show approximately the same increase. Regarding thermal conductivity, the systems in which graphite was blended (Examples 1 to 6) all showed an improvement of about 5% compared to the systems in which the amount of carbon black was increased (Comparative Examples 1 to 3).
実施例７．８は、比較例のカーボンブラック最大配合Ｎ
５３重量部に対して粒径１．０μｍのグラファイトを３
重量部（実施例７）、５重量部（実施例８）配合した系
を示す。耐摩耗性は、実施例７で比較例３に比して向上
するが、実施例８では低下する方向を示す。疲労性につ
いても、比較例３に比してグラファイト配合量を増加す
ることで低下していく。以上のことから、グラファイト
配合量は５重量部以下の配合がよいことが判る。Example 7.8 is the carbon black maximum blending N of the comparative example.
3 parts of graphite with a particle size of 1.0 μm to 53 parts by weight
A system containing 5 parts by weight (Example 7) and 5 parts by weight (Example 8) is shown. The wear resistance of Example 7 is improved compared to Comparative Example 3, but in Example 8 it shows a tendency to decrease. The fatigue property also decreases by increasing the graphite content compared to Comparative Example 3. From the above, it can be seen that the blending amount of graphite is preferably 5 parts by weight or less.
粒径については実施例１から６の間で中間の粒径である
１、０μｍが耐摩耗／発熱／疲労／熱伝導のバランスで
最も好ましい。Regarding the particle size, a particle size of 1.0 μm, which is an intermediate particle size between Examples 1 to 6, is most preferable in view of the balance of wear resistance/heat generation/fatigue/thermal conduction.
したがって、グラファイトの粒径は１．０μｍが最適と
考えられるが、粒子径０．５．４．５μｍのグラファイ
トは充分に有利な特性を示す。Therefore, it is considered that the optimum particle size of graphite is 1.0 μm, but graphite with a particle size of 0.5 to 4.5 μm exhibits sufficiently advantageous characteristics.
（２）比較例１、および実施例２．５のゴム組成物にて
１０００ Ｒ２０サイズのＲｉｂパターンサイズのタイ
ヤを試作し、このタイヤの転勤抵抗および発熱試験を実
施した。この結果を第２表に示す。(2) Tires with a Rib pattern size of 1000 R20 were prototyped using the rubber compositions of Comparative Example 1 and Example 2.5, and the tires were tested for transfer resistance and heat generation. The results are shown in Table 2.
注）
・転勤抵抗およびタイヤ発熱性共に１００以下で良好な
傾向とする。Note: ・Both transfer resistance and tire heat generation properties are considered to be 100 or less, indicating a good trend.
・転勤抵抗：空気圧７．２５ｋｇｆ／ｃａｌ、リム２０
Ｘ７．５０で室内回転ドラム試験機にて減衰
法にて測定。テストタイヤＡに対
する差を指数表示とした（数値の
少ない方が良好）。・Transfer resistance: Air pressure 7.25 kgf/cal, rim 20
Measured using the attenuation method using an indoor rotating drum tester at X7.50. The difference with respect to test tire A was expressed as an index (the smaller the number, the better).
・タイヤ発熱性：空気圧７．２５ｋｇｆ／ｃＩＩｔ、リ
ム２０×７．５０で室内回転ドラム試験機にて
３番へルトエソジ部の温度を測定
し、テストタイヤＡに対する温度
差を指数表示とした（数値の少な
い方が良好）。・Tire heat generation property: The temperature of the No. 3 helmet was measured using an indoor rotating drum tester with an air pressure of 7.25 kgf/cIIt and a rim of 20 x 7.50, and the temperature difference with respect to test tire A was expressed as an index (numerical value). (The less the better)
第２表からグラファイトでカーボンブラックを置換した
系（テストタイヤＢ）、およびカーボンブラック配合に
グラファイトを添加した系（テストタイヤＣ）共に、タ
イヤ転勤抵抗、発熱が改善されていることが判る。Table 2 shows that both the system in which carbon black was replaced with graphite (Test Tire B) and the system in which graphite was added to the carbon black formulation (Test Tire C) had improved tire transfer resistance and heat generation.
以上説明したように本発明によれば、タイヤ用ゴム組成
物に配合するカーボンブラックの一部をグラファイトで
置換することで、タイヤ用ゴム組成物に要求される耐摩
耗性および一般物性を低下させることなく、熱伝導度を
向上させ、タイヤ内部の熱を外部へ容易に伝導させるこ
とができるため、ゴム組成物およびそれを用いるタイヤ
の耐久性を向上させることが可能となる。As explained above, according to the present invention, by substituting a part of the carbon black blended into the tire rubber composition with graphite, the abrasion resistance and general physical properties required of the tire rubber composition are reduced. Since the thermal conductivity can be improved and the heat inside the tire can be easily conducted to the outside without causing any damage, it is possible to improve the durability of the rubber composition and the tire using the same.
本発明のゴム組成物をタイヤへ用いることで耐摩耗性／
耐久性のバランスを向上できる利点がある。By using the rubber composition of the present invention in tires, wear resistance/
This has the advantage of improving the balance of durability.
Claims (1)
ｍ＾２／ｇ以上のカーボンブラックを４０〜６０重量部
、およびグラファイトを３．０〜５．０重量部配合して
なるタイヤ用ゴム組成物。Nitrogen specific surface area: 100 parts by weight of diene rubber
A rubber composition for tires comprising 40 to 60 parts by weight of carbon black having a carbon black of m^2/g or more and 3.0 to 5.0 parts by weight of graphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25078689A JPH03115336A (en) | 1989-09-28 | 1989-09-28 | Tire rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25078689A JPH03115336A (en) | 1989-09-28 | 1989-09-28 | Tire rubber composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03115336A true JPH03115336A (en) | 1991-05-16 |
Family
ID=17213031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25078689A Pending JPH03115336A (en) | 1989-09-28 | 1989-09-28 | Tire rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03115336A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000016028A (en) * | 1998-07-02 | 2000-01-18 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire |
| WO2007132810A1 (en) * | 2006-05-17 | 2007-11-22 | Sumitomo Rubber Industries, Ltd. | Rubber composition for sidewall and tire having sidewall obtained from the same |
| JP2011137169A (en) * | 2006-04-06 | 2011-07-14 | Sumitomo Rubber Ind Ltd | Rubber composition |
-
1989
- 1989-09-28 JP JP25078689A patent/JPH03115336A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000016028A (en) * | 1998-07-02 | 2000-01-18 | Sumitomo Rubber Ind Ltd | Pneumatic radial tire |
| JP2011137169A (en) * | 2006-04-06 | 2011-07-14 | Sumitomo Rubber Ind Ltd | Rubber composition |
| WO2007132810A1 (en) * | 2006-05-17 | 2007-11-22 | Sumitomo Rubber Industries, Ltd. | Rubber composition for sidewall and tire having sidewall obtained from the same |
| US7759410B2 (en) | 2006-05-17 | 2010-07-20 | Sumitomo Rubber Industries, Ltd. | Rubber composition for sidewall and tire having a sidewall using same |
| JP2010215914A (en) * | 2006-05-17 | 2010-09-30 | Sumitomo Rubber Ind Ltd | Rubber composition for sidewall and tire having sidewall using the same |
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