JP2005225985A - Chafer rubber composition and pneumatic tire using the same - Google Patents

Chafer rubber composition and pneumatic tire using the same Download PDF

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JP2005225985A
JP2005225985A JP2004036337A JP2004036337A JP2005225985A JP 2005225985 A JP2005225985 A JP 2005225985A JP 2004036337 A JP2004036337 A JP 2004036337A JP 2004036337 A JP2004036337 A JP 2004036337A JP 2005225985 A JP2005225985 A JP 2005225985A
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Tatsuya Miyazaki
達也 宮崎
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Sumitomo Rubber Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire for heavy-load having a chafer at a bead part in which increase of hardness after use and reduction of fracture strength and resistance to crack development are prevented. <P>SOLUTION: A chafer rubber composition comprises 100 pts. wt. of a natural rubber and/or a diene synthetic rubber, 1-2.5 pts. wt. of sulfur and 0.2-3 pts. wt. of 1,3-bis(citraconimidomethyl)benzene, wherein the ratio of the compounded amount of a curing accelerator to that of the sulfur is 0.7 or more, or the compounded amount of 1,3-bis(citraconimidomethyl)benzene is 0.8-3 pts. wt. based on 100 pts. wt. of the rubber component. There is also provided a pneumatic tire for heavy-load having a chafer composed of the rubber composition at a bead part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、チェーファー用ゴム組成物および重荷重用空気入りタイヤに関する。   The present invention relates to a rubber composition for chafers and a heavy duty pneumatic tire.

ラバーチェーファーゴムは、リムと接し、高温に晒されることから、高温時でも高い硬度、熱的安定性を有し、かつ熱劣化し難い物性が要求される。   Since the rubber chafer rubber is in contact with the rim and exposed to a high temperature, the rubber chafer rubber is required to have a high hardness and a thermal stability even at a high temperature and a physical property that is not easily deteriorated by heat.

硬度を高くするために、微粒子で高充填のカーボンブラックが用いられている。また、熱的安定性を向上させるためには、ブタジエンゴム(BR)が用いられている。また、熱劣化抑制のためには、硫黄を少なく加硫促進剤を多く用いる逆転加硫系が採用されている。   In order to increase the hardness, carbon black which is highly filled with fine particles is used. Moreover, in order to improve thermal stability, butadiene rubber (BR) is used. Moreover, in order to suppress thermal degradation, a reverse vulcanization system using a small amount of sulfur and a large amount of vulcanization accelerator is employed.

しかしながら、いずれの方法によっても、リムから伝播されるブレーキ熱、およびビード内部、チェーファー自体の自己発熱により、高温下での架橋形態変化が避けられない。ここで、架橋形態変化とは、ポリマーとポリマーを結合する硫黄の分子形態の変化のことである。通常、硫黄原料としてS8を用いた場合、C−Sx−C(xは1〜6の整数)の結合形態をとる。x=1のとき、熱的に最も安定であるが、C−S結合の切断エネルギーは最も弱い。タイヤ加硫後の架橋形態は、モノスルフィド結合、ジスルフィド結合、ポリスルフィド結合の数で示され、この結合数および結合比率が走行後も不変であることがよいと考えられている。走行により架橋形態が変化すると、硬度が上昇して、破断強度、耐亀裂成長性の低下を招くなど耐久性の点で問題が生じる。 However, by either method, the change in the cross-linking form at high temperatures is unavoidable due to the brake heat transmitted from the rim and the self-heating of the inside of the bead and the chafer itself. Here, the cross-linked shape change is a change in the molecular form of sulfur that binds the polymer to the polymer. Normally, when using the S 8 as sulfur sources, C-S x -C (x is an integer from 1 to 6) takes the bound form of. When x = 1, it is thermally most stable, but the C—S bond cleavage energy is the weakest. The form of crosslinking after vulcanization of the tire is indicated by the number of monosulfide bonds, disulfide bonds, and polysulfide bonds, and it is considered that the number and ratio of these bonds should remain unchanged after running. When the cross-linking form is changed by running, the hardness increases, causing problems in terms of durability, such as a decrease in breaking strength and crack growth resistance.

一方、スチールコードコーティングゴムの耐久性を改善する手法として、1,3−ビス(シトラコンイミドメチル)ベンゼンを添加することが提案されている(たとえば、特許文献1)。しかしながら、これらは多量に硫黄と高価なコバルト化合物を配合しており、より熱の影響の大きいラバーチェーファーに用いると、ゴムは硬化し、タイヤをリムから取り出す際にゴム欠けが発生するという問題が生じる。   On the other hand, as a method for improving the durability of the steel cord coating rubber, it has been proposed to add 1,3-bis (citraconimidomethyl) benzene (for example, Patent Document 1). However, these contain a large amount of sulfur and an expensive cobalt compound, and when used in rubber chafers that are more affected by heat, the rubber hardens and causes problems of rubber chipping when the tire is removed from the rim. Occurs.

特開2002−327158号公報JP 2002-327158 A

本発明は、チェーファーをビード部に有する重荷重用空気入りタイヤにおいて、使用後における硬度の上昇、ならびに破断強度および耐亀裂成長性の低下を防止することを目的とする。   An object of the present invention is to prevent an increase in hardness after use and a decrease in breaking strength and crack growth resistance in a heavy duty pneumatic tire having a chafer in a bead portion.

本発明は、天然ゴムおよび/またはジエン系合成ゴム100重量部に対して、硫黄1〜2.5重量部および1,3−ビス(シトラコンイミドメチル)ベンゼン0.2〜3重量部を含むチェーファー用ゴム組成物であって、加硫促進剤の配合量に対する該硫黄の配合量の比が0.7以上、または、1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量がゴム成分100重量部に対して0.8〜3重量部のいずれかの条件を満たすチェーファー用ゴム組成物に関する。   The present invention relates to a chain comprising 1 to 2.5 parts by weight of sulfur and 0.2 to 3 parts by weight of 1,3-bis (citraconimidomethyl) benzene with respect to 100 parts by weight of natural rubber and / or diene synthetic rubber. A rubber composition for fur, wherein the ratio of the amount of sulfur to the amount of vulcanization accelerator is 0.7 or more, or the amount of 1,3-bis (citraconimidomethyl) benzene is 100 The present invention relates to a rubber composition for chafers that satisfies any of 0.8 to 3 parts by weight with respect to parts by weight.

また、本発明は、前記ゴム組成物からなるチェーファーをビード部に有する重荷重用空気入りタイヤに関する。   The present invention also relates to a heavy duty pneumatic tire having a chafer made of the rubber composition in a bead portion.

本発明によれば、チェーファー用ゴム組成物に1,3−ビス(シトラコンイミドメチル)ベンゼンおよび硫黄を特定量配合することにより、高温下での硫黄の架橋形態の変化を抑制することができ、それによって、走行によるチェーファーゴムの硬度の上昇を抑え、破断強度および耐亀裂成長性を向上させることができる。   According to the present invention, by incorporating a specific amount of 1,3-bis (citraconimidomethyl) benzene and sulfur into the rubber composition for chafers, it is possible to suppress changes in the crosslinking form of sulfur at high temperatures. Thereby, an increase in the hardness of the chafer rubber due to running can be suppressed, and the breaking strength and crack growth resistance can be improved.

本発明のチェーファー用ゴム組成物は、ゴム成分、硫黄および1,3−ビス(シトラコンイミドメチル)ベンゼンからなる。   The rubber composition for a chafer of the present invention comprises a rubber component, sulfur and 1,3-bis (citraconimidomethyl) benzene.

前記ゴム成分は、天然ゴム(NR)および/またはジエン系合成ゴムからなる。ジエン系合成ゴムとしては、たとえば、ブタジエンゴム(BR)、イソプレンゴム(IR)、スチレン−ブタジエンゴム(SBR)などがあげられるが、なかでも、tanδ、発熱性が低く、亀裂成長が微小で優れる点で、BRが好ましい。   The rubber component is made of natural rubber (NR) and / or diene synthetic rubber. Examples of the diene-based synthetic rubber include butadiene rubber (BR), isoprene rubber (IR), styrene-butadiene rubber (SBR), etc. Among them, tan δ, exothermic property is low, and crack growth is minute and excellent. In this respect, BR is preferable.

前記ゴム成分は、NRを30重量%以上、ジエン系合成ゴムを70重量%以下含有することが好ましい。NRの含有量が30重量%未満で、ジエン系合成ゴムの含有量が70重量%をこえると、NR特有の引張り強度およびリムとのズレを抑制する効果が充分でなく、リム着脱時のトー欠けが生じる、あるいは走行時において外傷ダメージが生じる傾向がある。また、NRを70重量%以下、ジエン系合成ゴムを30重量%以上含むことが好ましい。NRが70重量%をこえ、ジエン系合成ゴムが30重量%未満では、リムとの圧縮永久変形に耐えうる硬度が充分に得られない傾向がある。   The rubber component preferably contains 30% by weight or more of NR and 70% by weight or less of diene synthetic rubber. If the content of NR is less than 30% by weight and the content of diene synthetic rubber exceeds 70% by weight, the effect of suppressing the tensile strength specific to NR and the deviation from the rim is not sufficient, and the toe at the time of rim attachment / detachment is insufficient. There is a tendency for chipping or trauma damage during running. Further, it is preferable that NR is 70% by weight or less and diene synthetic rubber is 30% by weight or more. If the NR exceeds 70% by weight and the diene synthetic rubber is less than 30% by weight, there is a tendency that sufficient hardness to withstand compression permanent deformation with the rim cannot be obtained.

前記硫黄としては、一般的なS8などがあげられる。 Examples of the sulfur include general S 8 and the like.

前記硫黄の配合量は、前記ゴム成分100重量部に対して1重量部以上、好ましくは1.5重量部以上である。硫黄の配合量が1重量部未満では、隣接するスチールボンディング配合の硫黄量(通常3〜6重量部と多量である)との差が大きくなり、加硫中および使用中に、硫黄がスチールボンディングからチェーファー部に移行してきて物性変化が生じやすい。また、硫黄の配合量は、2.5重量部以下、好ましくは2重量部以下である。硫黄の配合量が2.5重量部をこえると、隣接するインナーライナー配合の硫黄量(通常0.5〜1重量部)との差が大きくなり、インナーライナーとチェーファー間の接着性が低くなる。   The compounding amount of the sulfur is 1 part by weight or more, preferably 1.5 parts by weight or more with respect to 100 parts by weight of the rubber component. If the amount of sulfur is less than 1 part by weight, the difference from the amount of sulfur in the adjacent steel bonding compound (usually 3-6 parts by weight) is large, and sulfur is steel bonded during vulcanization and use. Changes to the chafer part, and changes in physical properties are likely to occur. Moreover, the compounding quantity of sulfur is 2.5 weight part or less, Preferably it is 2 weight part or less. If the amount of sulfur exceeds 2.5 parts by weight, the difference from the amount of sulfur in the adjacent inner liner compound (usually 0.5 to 1 part by weight) increases, and the adhesion between the inner liner and the chafer is low. Become.

1,3−ビス(シトラコンイミドメチル)ベンゼンは、以下の構造式を有する。市販品としては、フレキシス社のパーカリンク900などがあげられる。   1,3-bis (citraconimidomethyl) benzene has the following structural formula. Examples of the commercial product include Flexa Parka Link 900.

Figure 2005225985
Figure 2005225985

本発明において、1,3−ビス(シトラコンイミドメチル)ベンゼンを、熱の影響が強く、架橋形態変化の大きいラバーチェーファーに用いられるゴム組成物に配合する。1,3−ビス(シトラコンイミドメチル)ベンゼンは、ジスルフィド結合(−S−S−)なみの強度を有し、かつ熱的に安定な結合を多数形成すると考えられている。この結合は熱的に安定であるので、より結合強度の弱いモノスルフィド結合(−S−)に形態が変化し難い。   In the present invention, 1,3-bis (citraconimidomethyl) benzene is blended in a rubber composition used for a rubber chafer that is strongly influenced by heat and has a large change in cross-linked morphology. 1,3-bis (citraconimidomethyl) benzene has a strength similar to that of a disulfide bond (—S—S—) and is considered to form many thermally stable bonds. Since this bond is thermally stable, the form hardly changes to a monosulfide bond (-S-) having a weaker bond strength.

1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量は、前記ゴム成分100重量部に対して0.2重量部以上、好ましくは0.25重量部以上、より好ましくは0.5重量部以上である。1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量が0.2重量部未満では、適性硫黄量(1.5〜2重量部)に対し不足しており、ポリスルフィド結合が主として形成される。また、1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量は、3重量部以下、好ましくは2重量部以下、より好ましくは1重量部以下である。1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量が3重量部をこえると、適性硫黄量より多くなり、形成されるジスルフィド結合数が頭打ちとなる。   The amount of 1,3-bis (citraconimidomethyl) benzene is 0.2 parts by weight or more, preferably 0.25 parts by weight or more, more preferably 0.5 parts by weight or more with respect to 100 parts by weight of the rubber component. It is. When the blending amount of 1,3-bis (citraconimidomethyl) benzene is less than 0.2 parts by weight, it is insufficient with respect to the appropriate sulfur amount (1.5 to 2 parts by weight), and polysulfide bonds are mainly formed. The amount of 1,3-bis (citraconimidomethyl) benzene is 3 parts by weight or less, preferably 2 parts by weight or less, more preferably 1 part by weight or less. When the blending amount of 1,3-bis (citraconimidomethyl) benzene exceeds 3 parts by weight, the amount exceeds the appropriate sulfur amount, and the number of disulfide bonds formed reaches a peak.

さらに、本発明のゴム組成物は、加硫促進剤を含むことができる。加硫促進剤としては、一般に使用されるものを用いることができ、たとえば、メルカプトベンゾチアゾール、ジベンゾチアジルジスルフィド、N−シクロヘキシルベンゾチアジルスルフェンアミド、N−tert−ブチル−2−ベンゾチアゾリルスルフェンアミド、N,N−ジシクロヘキシル−2−ベンゾチアゾリルスルフェンアミドなどがあげられる。   Furthermore, the rubber composition of the present invention can contain a vulcanization accelerator. As the vulcanization accelerator, commonly used ones can be used. For example, mercaptobenzothiazole, dibenzothiazyl disulfide, N-cyclohexylbenzothiazylsulfenamide, N-tert-butyl-2-benzothiazoli Examples include rusulfenamide and N, N-dicyclohexyl-2-benzothiazolylsulfenamide.

前記加硫促進剤の配合量は、前記ゴム成分100重量部に対して1重量部以上、さらには1.5重量部以上であることが好ましい。加硫促進剤の配合量が1重量部未満では、硬度および剛性が充分ではない傾向がある。また、加硫促進剤の配合量は、3重量部以下、さらには2.5重量部以下であることが好ましい。加硫促進剤の配合量が3重量部をこえると、硬度および剛性が大きくなることで、トー欠けが生じる傾向がある。   The blending amount of the vulcanization accelerator is preferably 1 part by weight or more, and more preferably 1.5 parts by weight or more with respect to 100 parts by weight of the rubber component. If the blending amount of the vulcanization accelerator is less than 1 part by weight, the hardness and rigidity tend to be insufficient. The blending amount of the vulcanization accelerator is preferably 3 parts by weight or less, more preferably 2.5 parts by weight or less. When the blending amount of the vulcanization accelerator exceeds 3 parts by weight, toe chipping tends to occur due to increased hardness and rigidity.

本発明のゴム組成物は、加硫促進剤の配合量に対する前記硫黄の配合量の比が0.7以上であること、または、1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量がゴム成分100重量部に対して0.8〜3重量部であることという2つの条件のうち、いずれか一方を満たすことが必要である。   In the rubber composition of the present invention, the ratio of the amount of sulfur to the amount of vulcanization accelerator is 0.7 or more, or the amount of 1,3-bis (citraconimidomethyl) benzene is rubber. It is necessary to satisfy one of the two conditions of 0.8 to 3 parts by weight with respect to 100 parts by weight of the component.

1つ目の条件である前記加硫促進剤の配合量に対する硫黄の配合量の比は、0.7以上である。該配合量の比が0.7未満では、モノスルフィドが主として形成され、引張り強度が不足することからトー欠けが発生しやすい傾向がある。また、該配合量の比は2.5以下、さらには1.5以下であることが好ましい。該配合量の比が2.5をこえるとポリスルフィドが主として形成され、硬化しやすくなり、リム着脱時にトー欠けが発生しやすい傾向がある。1,3−ビス(シトラコンイミドメチル)ベンゼンを多量に配合すれば、ジスルフィド結合が形成され、トー欠けが予防できるが、配合コストが高価となる。   The ratio of the amount of sulfur to the amount of the vulcanization accelerator, which is the first condition, is 0.7 or more. When the ratio of the blending amount is less than 0.7, monosulfide is mainly formed, and tensile strength tends to be insufficient, so that toe chipping tends to occur. Further, the ratio of the blending amounts is preferably 2.5 or less, more preferably 1.5 or less. When the blending ratio exceeds 2.5, polysulfide is mainly formed and tends to harden, and toe chipping tends to occur when the rim is attached / detached. If 1,3-bis (citraconimidomethyl) benzene is blended in a large amount, disulfide bonds are formed and toe chipping can be prevented, but the blending cost becomes expensive.

2つ目の条件である1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量は、ゴム成分100重量部に対して0.8〜3重量部である。1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量が0.8重量部未満では、適性硫黄量(1.5〜2重量部)に対し不足しており、ポリスルフィド結合が主として形成される。また、1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量が3重量部をこえると、適性硫黄量より多くなり、形成されるジスルフィド結合数が頭打ちとなる。   The amount of 1,3-bis (citraconimidomethyl) benzene, which is the second condition, is 0.8 to 3 parts by weight with respect to 100 parts by weight of the rubber component. When the blending amount of 1,3-bis (citraconimidomethyl) benzene is less than 0.8 part by weight, it is insufficient with respect to the appropriate sulfur amount (1.5 to 2 parts by weight), and polysulfide bonds are mainly formed. Moreover, when the compounding quantity of 1, 3-bis (citracon imidomethyl) benzene exceeds 3 weight part, it will become more than the suitable amount of sulfur, and the number of disulfide bonds formed will reach a peak.

本発明のゴム組成物は、さらにカーボンブラックを含むことができる。カーボンブラックとしては、チッ素吸着比表面積(N2SA)が70m2/g以上、さらには80m2/g以上のものが好ましい。N2SAが70m2/g未満では補強効果が充分ではなく、耐摩耗性、硬度、剛性が得られない傾向がある。また、N2SAが130m2/g以下、さらには120m2/g以下のものが好ましい。N2SAが130m2/gをこえると発熱および硬化しやすくなり、リム着脱時にトー欠けが生じやすくなる傾向がある。 The rubber composition of the present invention can further contain carbon black. The carbon black preferably has a nitrogen adsorption specific surface area (N 2 SA) of 70 m 2 / g or more, more preferably 80 m 2 / g or more. When N 2 SA is less than 70 m 2 / g, the reinforcing effect is not sufficient, and there is a tendency that the wear resistance, hardness and rigidity cannot be obtained. N 2 SA is preferably 130 m 2 / g or less, more preferably 120 m 2 / g or less. When N 2 SA exceeds 130 m 2 / g, heat generation and curing tend to occur, and toe chipping tends to occur when the rim is attached / detached.

前記カーボンブラックの配合量は、前記ゴム成分100重量部に対して55重量部以上、さらには60重量部以上であることが好ましい。カーボンブラックの配合量が55重量部未満では、補強効果、耐摩耗性、硬度および剛性が不充分な傾向がある。また、カーボンブラックの配合量は、80重量部以下、さらには75重量部以下であることが好ましい。カーボンブラックの配合量が80重量部をこえると、発熱および硬化しやすくなり、リム着脱時にトー欠けが生じやすくなる傾向がある。   The compounding amount of the carbon black is preferably 55 parts by weight or more, more preferably 60 parts by weight or more with respect to 100 parts by weight of the rubber component. When the blending amount of carbon black is less than 55 parts by weight, the reinforcing effect, wear resistance, hardness and rigidity tend to be insufficient. The blending amount of carbon black is preferably 80 parts by weight or less, more preferably 75 parts by weight or less. When the blending amount of the carbon black exceeds 80 parts by weight, heat generation and curing tend to occur, and toe chipping tends to occur when the rim is attached / detached.

さらに、本発明のチェーファー用ゴム組成物には、タイヤ用ゴム組成物に一般に用いられる充填剤、たとえばステアリン酸等の不飽和脂肪酸、シリカ、シランカップリング剤、オイル、ワックス、老化防止剤、酸化亜鉛などを適宜配合することができる。   Further, the chafer rubber composition of the present invention includes fillers generally used in tire rubber compositions, such as unsaturated fatty acids such as stearic acid, silica, silane coupling agents, oils, waxes, anti-aging agents, Zinc oxide or the like can be appropriately blended.

本発明のチェーファー用ゴム組成物は、前記ゴム成分、硫黄、1,3−ビス(シトラコンイミドメチル)ベンゼン、および加硫促進剤、ならびに必要に応じてカーボンブラック、およびその他の充填剤を混練りしたのち、加硫することによって得ることができる。   The rubber composition for chafers of the present invention contains the rubber component, sulfur, 1,3-bis (citraconimidomethyl) benzene, a vulcanization accelerator, and carbon black and other fillers as necessary. It can be obtained by kneading and vulcanizing.

加硫温度は、140℃以上であることが好ましい。加流温度が140℃未満ではゴム配合を適性物性にするまでの時間が長すぎる傾向がある。また、加硫温度は200℃以下であることが好ましい。加硫温度が200℃をこえると物性(特にtanδ)が低下し、リバージョンが発生する傾向がある。   The vulcanization temperature is preferably 140 ° C. or higher. When the heating temperature is less than 140 ° C., the time until rubber blending has suitable physical properties tends to be too long. The vulcanization temperature is preferably 200 ° C. or lower. When the vulcanization temperature exceeds 200 ° C., the physical properties (particularly tan δ) tend to decrease and reversion tends to occur.

本発明のチェーファー用ゴム組成物は、熱によって永久変形を起こしにくく、割れに対する耐久性に優れており、とくにトラックやバスなどの重荷重用空気入りタイヤのビード部チェーファーに好適に用いられる。   The rubber composition for chafers of the present invention hardly causes permanent deformation by heat and has excellent durability against cracking, and is particularly suitable for bead chafers of heavy duty pneumatic tires such as trucks and buses.

以下に、実施例に基づいて本発明を具体的に説明するが、本発明は、これらのみに制限されるものではない。   EXAMPLES The present invention will be specifically described below based on examples, but the present invention is not limited to these.

以下に、実施例および比較例で用いた試薬をまとめて示す。
NR:RSS♯3
BR130B:宇部興産(株)製のウベポール
カーボンブラックN219:三菱化学(株)製 LI(N2SA:105m2/g)
酸化亜鉛:三井金属鉱業(株)製の亜鉛華1号
ステアリン酸:日本油脂(株)製のステアリン酸
老化防止剤:大内新興化学工業(株)製のノクラック6c
ワックス:大内新興化学工業(株)製のサンノックN
硫黄:軽井沢硫黄(株)製の粉末硫黄
加硫促進剤TBBS:大内新興化学工業(株)製のノクセラーNS(N−(t−ブチル) −2−ベンゾチアゾリルスルフェンアミド)
パーカリンク900:フレキシス社製のパーカリンク900
The reagents used in the examples and comparative examples are collectively shown below.
NR: RSS # 3
BR130B: Ubepol carbon black N219 manufactured by Ube Industries, Ltd. LI manufactured by Mitsubishi Chemical Corporation (N 2 SA: 105 m 2 / g)
Zinc oxide: Zinc Hua No. 1 manufactured by Mitsui Mining & Smelting Co., Ltd. Stearic acid: Stearic acid anti-aging agent manufactured by Nippon Oil & Fats Co., Ltd .: NOCRACK 6c manufactured by Ouchi Shinsei Chemical Co., Ltd.
Wax: Sunnock N manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
Sulfur: Powder sulfur vulcanization accelerator TBBS manufactured by Karuizawa Sulfur Co., Ltd .: Noxeller NS (N- (t-butyl) -2-benzothiazolylsulfenamide) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Parker Link 900: Parker Link 900 manufactured by Flexis

実施例1〜3および比較例1〜7
表1の配合内容にしたがって、まず、硫黄および加硫促進剤を除く成分を、バンバリーミキサーを用いて150℃で5分間混練りし、ついで、硫黄および加硫促進剤を加えて、オープンロールを用いて約80℃で5分間混練りした。得られたゴム組成物をチェーファーの形状に合わせて押出し加工し、タイヤ成型機にて通常の方法にて未加硫のタイヤを成形した。得られた未加硫のタイヤを、196N、150℃の条件で30分間プレス加硫することにより、サイズTBR 11R22.5 16Pのタイヤを試作し、以下の試験を実施して耐久性を評価した。
Examples 1-3 and Comparative Examples 1-7
In accordance with the contents of Table 1, first, the components excluding sulfur and the vulcanization accelerator were kneaded for 5 minutes at 150 ° C. using a Banbury mixer, then sulfur and the vulcanization accelerator were added, and an open roll was added. And kneaded at about 80 ° C. for 5 minutes. The obtained rubber composition was extruded according to the shape of the chafer, and an unvulcanized tire was molded by a usual method using a tire molding machine. The obtained unvulcanized tire was press vulcanized for 30 minutes under the conditions of 196 N and 150 ° C., thereby producing a tire of size TBR 11R22.5 16P and performing the following test to evaluate the durability. .

(オーブン劣化試験)
試作タイヤのチェーファーからサンプリングし、ゴムサンプルを得た。ゴムサンプルを100℃のオーブンで96時間放置し、熱老化させた。そののち、引張試験機により、JIS−K6251に準じて3号ダンベルを用いて引張試験を行ない、破断時の強度(TB(MPa))および伸び率(EB(%))を測定した。実施例1におけるTB×EBの値をを100として、それぞれのTB×EBの値を指数化した。指数が大きいほど耐久性に優れている。
(Oven deterioration test)
A rubber sample was obtained from a prototype tire chafer. The rubber sample was left in an oven at 100 ° C. for 96 hours to be heat aged. After that, a tensile test was performed using a No. 3 dumbbell in accordance with JIS-K6251 using a tensile tester, and the strength at break (T B (MPa)) and elongation (E B (%)) were measured. 100 The values of T B × E B in Example 1 was indexed the value of each T B × E B. The larger the index, the better the durability.

(実車試験)
試作タイヤを10トントラックに装着し、15万キロ実車走行させたのち、前記の方法と同様の方法で引張試験を行なった。実施例1におけるTB×EBの値をを100として、それぞれのTB×EBの値を指数化した。指数が大きいほど耐久性に優れている。
(Actual vehicle test)
The prototype tire was mounted on a 10-ton truck, and 150,000 km of vehicle was run, and then a tensile test was performed in the same manner as described above. 100 The values of T B × E B in Example 1 was indexed the value of each T B × E B. The larger the index, the better the durability.

Figure 2005225985
Figure 2005225985

結果を表1に示す。実施例1〜3は、パーカリンク900(商品名)を全く添加しなかった比較例1〜2、少量のみ添加した比較例3〜4および多量に添加した比較例5〜6に比べて、耐久性に優れることがわかる。   The results are shown in Table 1. Examples 1-3 are more durable than Comparative Examples 1-2 in which no Parkalink 900 (trade name) was added, Comparative Examples 3-4 in which only a small amount was added, and Comparative Examples 5-6 in which a large amount was added. It turns out that it is excellent in property.

Claims (2)

天然ゴムおよび/またはジエン系合成ゴム100重量部に対して、硫黄1〜2.5重量部および1,3−ビス(シトラコンイミドメチル)ベンゼン0.2〜3重量部を含むチェーファー用ゴム組成物であって、
加硫促進剤の配合量に対する該硫黄の配合量の比が0.7以上、または、
1,3−ビス(シトラコンイミドメチル)ベンゼンの配合量がゴム成分100重量部に対して0.8〜3重量部
のいずれかの条件を満たすチェーファー用ゴム組成物。
Rubber composition for chafers containing 1 to 2.5 parts by weight of sulfur and 0.2 to 3 parts by weight of 1,3-bis (citraconimidomethyl) benzene with respect to 100 parts by weight of natural rubber and / or diene synthetic rubber A thing,
The ratio of the amount of sulfur to the amount of vulcanization accelerator is 0.7 or more, or
A rubber composition for chafers in which the amount of 1,3-bis (citraconimidomethyl) benzene satisfies any condition of 0.8 to 3 parts by weight with respect to 100 parts by weight of the rubber component.
請求項1記載のゴム組成物からなるチェーファーをビード部に有する重荷重用空気入りタイヤ。 A heavy duty pneumatic tire having a chafer made of the rubber composition according to claim 1 in a bead portion.
JP2004036337A 2004-02-13 2004-02-13 Rubber composition for chafer and pneumatic tire using the same Expired - Fee Related JP4402473B2 (en)

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WO2008044289A1 (en) * 2006-10-11 2008-04-17 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
JP2008100675A (en) * 2006-10-10 2008-05-01 Goodyear Tire & Rubber Co:The Tire with sidewall insert
JP2009001645A (en) * 2007-06-20 2009-01-08 Sumitomo Rubber Ind Ltd Rubber composition for tire clinch and tire with tire clinch using the same
US8353324B2 (en) 2006-10-11 2013-01-15 Toyo Tire Rubber Co., Ltd. Pneumatic tire
US8376005B2 (en) 2006-09-27 2013-02-19 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
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Publication number Priority date Publication date Assignee Title
US8376005B2 (en) 2006-09-27 2013-02-19 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
JP2008100675A (en) * 2006-10-10 2008-05-01 Goodyear Tire & Rubber Co:The Tire with sidewall insert
WO2008044289A1 (en) * 2006-10-11 2008-04-17 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
JPWO2008044289A1 (en) * 2006-10-11 2010-02-04 東洋ゴム工業株式会社 Pneumatic tire
JP4996613B2 (en) * 2006-10-11 2012-08-08 東洋ゴム工業株式会社 Pneumatic tire
US8353324B2 (en) 2006-10-11 2013-01-15 Toyo Tire Rubber Co., Ltd. Pneumatic tire
US8424578B2 (en) 2006-10-11 2013-04-23 Toyo Tire & Rubber Co., Ltd. Pneumatic tire
JP2009001645A (en) * 2007-06-20 2009-01-08 Sumitomo Rubber Ind Ltd Rubber composition for tire clinch and tire with tire clinch using the same
US11718699B2 (en) 2020-06-10 2023-08-08 Toyo Tire Corporation Rubber-steel cord composite and pneumatic tire using the same
US11718700B2 (en) 2020-06-10 2023-08-08 Toyo Tire Corporation Rubber-steel cord composite and pneumatic tire

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