JP5223445B2 - Rubber composition for rim cushion - Google Patents
Rubber composition for rim cushion Download PDFInfo
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- JP5223445B2 JP5223445B2 JP2008120033A JP2008120033A JP5223445B2 JP 5223445 B2 JP5223445 B2 JP 5223445B2 JP 2008120033 A JP2008120033 A JP 2008120033A JP 2008120033 A JP2008120033 A JP 2008120033A JP 5223445 B2 JP5223445 B2 JP 5223445B2
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- rim cushion
- rim
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- 229920001971 elastomer Polymers 0.000 title claims description 91
- 239000005060 rubber Substances 0.000 title claims description 91
- 239000000203 mixture Substances 0.000 title claims description 36
- 244000043261 Hevea brasiliensis Species 0.000 claims description 19
- 229920003052 natural elastomer Polymers 0.000 claims description 19
- 229920001194 natural rubber Polymers 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000006229 carbon black Substances 0.000 claims description 12
- 229920003244 diene elastomer Polymers 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 238000005227 gel permeation chromatography Methods 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 230000020169 heat generation Effects 0.000 description 9
- 238000002156 mixing Methods 0.000 description 7
- 239000005062 Polybutadiene Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229920002857 polybutadiene Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000003811 acetone extraction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 238000000045 pyrolysis gas chromatography Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010059 sulfur vulcanization Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- Y02T10/862—
Description
本発明は、リムクッション用ゴム組成物に関し、さらに詳しくは、環境負荷の低減を図るため再生ゴムを配合しながら、従来レベル又はそれ以上の耐摩耗性と低発熱性を達成するようにしたリムクッション用ゴム組成物に関する。 The present invention relates to a rubber composition for a rim cushion, and more specifically, a rim that achieves wear resistance and low heat generation at or above conventional levels while compounding recycled rubber in order to reduce environmental burden. The present invention relates to a rubber composition for a cushion.
空気入りタイヤのビード部の外表面には、タイヤをホイールにリム組みしたときリムに対して密着するようにリムクッションゴムが設けられている。このリムクッションゴムは、タイヤをリム組みしたときにリムシートとリムフランジとに密着するように嵌合することにより、リムに対するリムずれを防止すると共に、エアシール性を保つものでなければならない。このためリムクッション部を構成するゴム組成物は、リムに対する耐摩耗性に優れることと共に、タイヤ回転時に繰り返し与えられる圧縮変形に対して低発熱性に優れることにより燃費性能を良好にするものであることが望まれている。 A rim cushion rubber is provided on the outer surface of the bead portion of the pneumatic tire so as to be in close contact with the rim when the tire is assembled on the wheel. The rim cushion rubber must be fitted with the rim seat and the rim flange so as to be in close contact with the rim when the tire is assembled, thereby preventing rim displacement with respect to the rim and maintaining the air sealing property. For this reason, the rubber composition constituting the rim cushion part is excellent in fuel efficiency by being excellent in abrasion resistance to the rim and in being excellent in low heat generation against compression deformation repeatedly applied during tire rotation. It is hoped that.
一方、地球環境を保護する観点から、空気入りタイヤのリサイクル率を高くすることが要求されるようになり、使用済みのタイヤやチューブから回収された再生粉末ゴムを新しいゴム原料中に配合することが提案されている（例えば、特許文献１参照）。しかしながら、このような再生ゴムをリムクッション用ゴム組成物に配合すると耐摩耗性が低下すると共に、ｔａｎδの増大を招き発熱性が悪化するという問題があった。 On the other hand, from the viewpoint of protecting the global environment, it has become necessary to increase the recycling rate of pneumatic tires, and recycled powder rubber recovered from used tires and tubes must be blended into new rubber raw materials. Has been proposed (see, for example, Patent Document 1). However, when such recycled rubber is blended with a rubber composition for a rim cushion, there is a problem that wear resistance is lowered, tan δ is increased, and heat generation is deteriorated.
したがって、リムクッションゴムを構成するゴム組成物に再生ゴムを配合してリサイクル率を高くしながら、従来レベル又はそれ以上の耐摩耗性と低発熱性を達成可能にしたリムクッション用ゴム組成物の実現が望まれている。
本発明の目的は、リサイクル率を高め環境負荷の低減を図るため、再生ゴムを配合しながら従来レベル又はそれ以上の耐摩耗性と低発熱性を達成するようにしたリムクッション用ゴム組成物を提供することにある。 An object of the present invention is to provide a rubber composition for a rim cushion that achieves at least conventional wear resistance and low heat generation while compounding recycled rubber in order to increase the recycling rate and reduce environmental impact. It is to provide.
上記目的を達成する本発明のリムクッション用ゴム組成物は、天然ゴムを４０〜６０重量％含むジエン系ゴム１００重量部に対し、窒素吸着比表面積が７０ｍ２／ｇ以上のカーボンブラックを７０〜９０重量部、再生ゴムを２〜２０重量部配合してなり、前記再生ゴムがムーニー粘度３５〜６５、該再生ゴム中のゴム成分の天然ゴム含有比率が６０重量％以上、かつ該再生ゴム中のゾルのゲル透過クロマトグラフによる重量平均分子量が６００００以下であることを特徴とする。 The rubber composition for a rim cushion of the present invention that achieves the above-mentioned object is obtained by using 70 to 60 carbon black having a nitrogen adsorption specific surface area of 70 m 2 / g or more with respect to 100 parts by weight of a diene rubber containing 40 to 60% by weight of natural rubber. 90 parts by weight, 2 to 20 parts by weight of recycled rubber, the recycled rubber has a Mooney viscosity of 35 to 65, the natural rubber content of the rubber component in the recycled rubber is 60% by weight or more, and the recycled rubber The sol has a weight average molecular weight of 60000 or less as determined by gel permeation chromatography.
このリムクッション用ゴム組成物は、空気入りタイヤのリムクッション部を構成するのに好適である。 This rubber composition for a rim cushion is suitable for constituting a rim cushion portion of a pneumatic tire.
本発明のリムクッション用ゴム組成物によれば、天然ゴムを４０〜６０重量％含むジエン系ゴム１００重量部に対し、窒素吸着比表面積が７０ｍ２／ｇ以上のカーボンブラックを７０〜９０重量部、再生ゴムを２〜２０重量部配合するようにしたので、従来のリムクッションゴムのレベル又はそれ以上の耐摩耗性と低発熱性を達成すると共に、リサイクル率を高くすることができる。特に、再生ゴムの性状を、ムーニー粘度を３５〜６５にし、再生ゴム中のゴム成分の天然ゴム含有比率を６０重量％以上にすると共に、再生ゴム中のゾルのゲル透過クロマトグラフによる重量平均分子量を６００００以下にしたので、耐摩耗性を低下させず、かつｔａｎδを大きくすることなく低発熱性を維持することができる。 According to the rubber composition for a rim cushion of the present invention, 70 to 90 parts by weight of carbon black having a nitrogen adsorption specific surface area of 70 m 2 / g or more with respect to 100 parts by weight of diene rubber containing 40 to 60% by weight of natural rubber. Since 2 to 20 parts by weight of the recycled rubber is blended, it is possible to achieve wear resistance and low heat build-up at or above the level of conventional rim cushion rubber, and to increase the recycling rate. In particular, the properties of the recycled rubber are such that the Mooney viscosity is 35 to 65, the natural rubber content of the rubber component in the recycled rubber is 60% by weight or more, and the weight average molecular weight by gel permeation chromatography of the sol in the recycled rubber. Is made 60000 or less, it is possible to maintain low heat generation without reducing wear resistance and increasing tan δ.
本発明のリムクッション用ゴム組成物において、ゴム成分はジエン系ゴムとし、そのジエン系ゴムは、天然ゴムを４０〜６０重量％、好ましくは４５〜５５重量％含むようにする。ジエン系ゴム中の天然ゴムが４０重量％未満の場合には、破断強度が低下する。また、天然ゴムの配合量が６０重量％を超える場合には、ｔａｎδが増大し、発熱性が悪化する。なお、マトリックスのゴム成分中の天然ゴム４０〜６０重量％には、再生ゴムを除くものとする。 In the rubber composition for a rim cushion of the present invention, the rubber component is a diene rubber, and the diene rubber contains 40 to 60% by weight, preferably 45 to 55% by weight of natural rubber. When the natural rubber in the diene rubber is less than 40% by weight, the breaking strength is lowered. On the other hand, when the blending amount of the natural rubber exceeds 60% by weight, tan δ increases and the exothermic property deteriorates. Note that recycled rubber is excluded from 40 to 60% by weight of the natural rubber in the rubber component of the matrix.
天然ゴム以外のジエン系ゴムとしては、特に制限されるものではなく、リムクッション用ゴム組成物に通常用いられるイソプレンゴム、スチレン−ブタジエンゴム、ブタジエンゴム、アクリロニトリル−ブタジエンゴム、ブチルゴム等が挙げられる。好ましくはブタジエンゴム、スチレン−ブタジエンゴムがよい。これらジエン系ゴムは、単独又は任意のブレンドとして使用することができる。 The diene rubber other than natural rubber is not particularly limited, and examples thereof include isoprene rubber, styrene-butadiene rubber, butadiene rubber, acrylonitrile-butadiene rubber, and butyl rubber, which are usually used in a rubber composition for a rim cushion. Preferred is butadiene rubber or styrene-butadiene rubber. These diene rubbers can be used alone or as any blend.
上記ゴム成分に配合する混合物のうち、再生ゴムの配合量は、ジエン系ゴム１００重量部に対し２〜２０重量部、好ましくは５〜１５重量部にする。再生ゴムの配合量が２重量部未満では、リサイクル率を高くすることができない。また、再生ゴムの配合量が２０重量部を超える場合には、ｔａｎδが増大し発熱が大きくなると共に、耐摩耗性が悪化する。 Of the mixture blended with the rubber component, the amount of recycled rubber is 2 to 20 parts by weight, preferably 5 to 15 parts by weight, per 100 parts by weight of the diene rubber. If the amount of recycled rubber is less than 2 parts by weight, the recycling rate cannot be increased. When the amount of recycled rubber exceeds 20 parts by weight, tan δ increases, heat generation increases, and wear resistance deteriorates.
本発明で使用する再生ゴムは、ＪＩＳ Ｋ６３１３に規定された自動車用タイヤ、チューブ及びその他のゴム製品の使用済みのゴムなどを再生したもの並びにこれと同等の性状を有するものとする。再生ゴムの種類は、チューブ再生ゴム、タイヤ再生ゴム、その他の再生ゴムから選ばれるいずれでもよく、複数の種類を組合わせることもできる。なかでも、タイヤ再生ゴムが好ましい。なお、本発明では、再生ゴムは、ＪＩＳ Ｋ６３１３の規定に従い、所謂粉末ゴム以外の脱硫処理が施された再生ゴムとする。 The recycled rubber used in the present invention is a recycled rubber of automobile tires, tubes and other rubber products defined in JIS K6313, and has the same properties. The type of recycled rubber may be any one selected from tube recycled rubber, tire recycled rubber, and other recycled rubbers, and a plurality of types may be combined. Of these, tire recycled rubber is preferable. In the present invention, the recycled rubber is a recycled rubber that has been subjected to desulfurization treatment other than so-called powder rubber in accordance with the provisions of JIS K6313.
再生ゴムの特性としては、ムーニー粘度（ＭＬ１＋４）が３５〜６５、好ましくは４０〜６０のものを使用する。ムーニー粘度が３５未満であると、混合時に分散性が悪化する。また、ムーニー粘度が６５を超えると、ｔａｎδが増大し発熱が大きくなる。ここで、ムーニー粘度（ＭＬ１＋４）とは、ＪＩＳ Ｋ６３００に準拠し、１００℃で測定した値をいう。 The recycled rubber has a Mooney viscosity (ML 1 + 4 ) of 35 to 65, preferably 40 to 60. If the Mooney viscosity is less than 35, dispersibility deteriorates during mixing. On the other hand, when the Mooney viscosity exceeds 65, tan δ increases and heat generation increases. Here, Mooney viscosity (ML 1 + 4 ) refers to a value measured at 100 ° C. in accordance with JIS K6300.
また、再生ゴム中のゴム成分は、天然ゴム含有比率が６０重量％以上、好ましくは６０〜８５重量％である。天然ゴム含有比率が６０重量％未満であると、耐摩耗性が悪化する。なお、再生ゴム中の天然ゴム含有比率は、熱分解ガスクロマトグラフィー（ＰｙＧＣ）の測定により求められる値という。 The rubber component in the recycled rubber has a natural rubber content of 60% by weight or more, preferably 60 to 85% by weight. When the natural rubber content is less than 60% by weight, the wear resistance is deteriorated. In addition, the natural rubber content ratio in the recycled rubber is referred to as a value obtained by measurement by pyrolysis gas chromatography (PyGC).
本発明で使用する再生ゴムは、ゾルの分子量がゲル透過クロマトグラフによる重量平均分子量で６００００以下、好ましくは３００００〜６００００にする。ゾルの重量分子量が６００００を超える場合には、ｔａｎδが大きくなり発熱が大きくなる。ここで、再生ゴム中のゾルは、常温でトルエンに溶解する成分とする。ゾルの分子量は再生ゴムをフィルムにしたものを切断し小片化し、約２００倍量のトルエンに浸漬し２４時間静置する。次いで、２００メッシュの金網で再生ゴムを浸漬したトルエン溶液を濾過し、その濾液に含まれるゾルの分子量をゲル透過クロマトグラフ（Gel permeation chromatography（ＧＰＣ））により重量平均分子量（ポリスチレン換算）で測定したものをいう。 The recycled rubber used in the present invention has a sol molecular weight of 60,000 or less, preferably 30,000 to 60,000, as a weight average molecular weight determined by gel permeation chromatography. When the weight molecular weight of the sol exceeds 60000, tan δ increases and heat generation increases. Here, the sol in the recycled rubber is a component that dissolves in toluene at room temperature. The molecular weight of the sol is obtained by cutting a regenerated rubber film into small pieces, dipping in about 200 times the amount of toluene, and allowing to stand for 24 hours. Next, the toluene solution in which the regenerated rubber was immersed in a 200-mesh wire mesh was filtered, and the molecular weight of the sol contained in the filtrate was measured by gel permeation chromatography (GPC) in terms of weight average molecular weight (polystyrene conversion). Say things.
ゴム成分に配合する混合物のうち、カーボンブラックの配合量は、ジエン系ゴム１００重量部に対し７０〜９０重量部、好ましくは７５〜８５重量部にする。カーボンブラックの配合量が７０重量部未満の場合には耐摩耗性を十分に高くすることができない。また、カーボンブラックの配合量が９０重量部を超えると発熱性が悪化する。 In the mixture to be blended with the rubber component, the blending amount of carbon black is 70 to 90 parts by weight, preferably 75 to 85 parts by weight with respect to 100 parts by weight of the diene rubber. When the blending amount of carbon black is less than 70 parts by weight, the wear resistance cannot be sufficiently increased. On the other hand, if the blending amount of carbon black exceeds 90 parts by weight, the exothermic property deteriorates.
本発明において使用するカーボンブラックは、窒素吸着比表面積（Ｎ２ＳＡ）が７０ｍ２／ｇ以上、好ましくは７５〜９５ｍ２／ｇのものを使用する。カーボンブラックの窒素吸着比表面積が７０ｍ２／ｇ未満の場合には、十分な補強性が得られない。カーボンブラックの窒素吸着比表面積（Ｎ２ＳＡ）は、ＪＩＳ Ｋ６２１７−２に準拠して求められるものとする。 Carbon black used in the present invention, the nitrogen adsorption specific surface area (N 2 SA) of 70m 2 / g or more, preferably used ones 75~95m 2 / g. When the nitrogen adsorption specific surface area of carbon black is less than 70 m 2 / g, sufficient reinforcement cannot be obtained. Nitrogen adsorption specific surface area (N 2 SA) of carbon black shall be determined in accordance with JIS K6217-2.
本発明のリムクッション用ゴム組成物には、カーボンブラック以外の無機充填剤を配合してもよい。無機充填剤としては、例えば、シリカ、クレー、炭酸カルシウム、水酸化アルミニウム、マイカ、タルク等を例示することができる。 You may mix | blend inorganic fillers other than carbon black with the rubber composition for rim cushions of this invention. Examples of the inorganic filler include silica, clay, calcium carbonate, aluminum hydroxide, mica, talc and the like.
また、リムクッション用ゴム組成物には、加硫剤、加硫促進剤、老化防止剤、可塑剤などのゴム組成物に一般的に使用される各種添加剤を配合することができ、かかる添加剤は一般的な方法で混練してゴム組成物とし、加硫又は架橋するのに使用することができる。これらの添加剤の配合量は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 addition, the rubber composition for the rim cushion can be blended with various additives generally used in rubber compositions such as vulcanizing agents, vulcanization accelerators, anti-aging agents, and plasticizers. The agent can be kneaded by a general method to obtain a rubber composition, which can be used for vulcanization or crosslinking. As long as the amount of these additives is not contrary to the object of the present invention, a conventional general amount can be used.
リムクッション用ゴム組成物は、公知のゴム用混練機械、例えば、バンバリーミキサー、ニーダー、ロール等を使用して、上記各成分を混合することによって製造することができる。 The rubber composition for a rim cushion can be produced by mixing the above-described components using a known rubber kneading machine such as a Banbury mixer, a kneader, a roll, or the like.
本発明のリムクッション用ゴム組成物は、再生ゴムを使用してリサイクル率を高くしながら、耐摩耗性を高いレベルで維持すると共に、ｔａｎδを小さくし低発熱性にすることができる。このリムクッション用ゴム組成物は、リムクッション部に適用することが好ましく、このゴム組成物から構成されたリムクッション部を有する空気入りタイヤは、耐摩耗性に優れ、リムずれが起こりにくく耐久性に優れるとともに、燃費性能を向上することができる。 The rubber composition for a rim cushion according to the present invention can maintain the wear resistance at a high level while increasing the recycle rate by using recycled rubber, and can reduce tan δ and reduce heat generation. This rubber composition for a rim cushion is preferably applied to a rim cushion portion, and a pneumatic tire having a rim cushion portion made of this rubber composition has excellent wear resistance and is resistant to rim slippage and durability. In addition, the fuel efficiency can be improved.
以下、実施例によって本発明をさらに説明するが、本発明の範囲はこれらの実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further, the scope of the present invention is not limited to these Examples.
表１に示す配合からなる１１種類のゴム組成物（実施例１〜５、比較例１〜６）を、それぞれ硫黄及び加硫促進剤を除く配合成分を秤量し、１.７Ｌのバンバリーミキサーで４分間混練し、温度１６０℃でマスターバッチを放出し室温冷却した。このマスターバッチを１.７Ｌのバンバリーミキサーに供し、硫黄及び加硫促進剤を加え混合し、リムクッション用ゴム組成物を調製した。 Eleven kinds of rubber compositions (Examples 1 to 5 and Comparative Examples 1 to 6) having the composition shown in Table 1 were weighed with the composition components except sulfur and a vulcanization accelerator, respectively, and a 1.7 L Banbury mixer. The mixture was kneaded for 4 minutes, and the master batch was discharged at a temperature of 160 ° C. and cooled at room temperature. This master batch was subjected to a 1.7 L Banbury mixer, and sulfur and a vulcanization accelerator were added and mixed to prepare a rubber composition for a rim cushion.
得られた１１種類のゴム組成物（実施例１〜５、比較例１〜６）を、それぞれ所定形状の金型中で、１５０℃、３０分間加硫して試験片を作製し、発熱性（ｔａｎδ）を下記に示す方法により測定した。また、これらのゴム組成物からなるリムクッション部を有する空気入りタイヤをそれぞれ製作し、耐摩耗性を下記に示す方法により測定した。 The obtained 11 types of rubber compositions (Examples 1 to 5 and Comparative Examples 1 to 6) were each vulcanized in a mold having a predetermined shape at 150 ° C. for 30 minutes to prepare a test piece, which was exothermic. (Tan δ) was measured by the method shown below. In addition, pneumatic tires each having a rim cushion portion made of these rubber compositions were produced, and the wear resistance was measured by the method described below.
発熱性（ｔａｎδ）
東洋精機製作所社製粘弾性スペクトロメーターを用いて、温度６０℃におけるｔａｎδを、静的歪み１０％、動的歪み±２％、周波数２０Ｈｚの条件で測定した。得られた結果は、比較例１の値を１００とする指数で表わし表１に示した。ｔａｎδの指数が小さいほどヒステリシスロスが小さく低発熱性に優れることを意味する。
Exothermic (tan δ)
Using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho, tan δ at a temperature of 60 ° C. was measured under the conditions of static strain 10%, dynamic strain ± 2%, and frequency 20 Hz. The obtained results are shown in Table 1 as an index with the value of Comparative Example 1 as 100. It means that the smaller the index of tan δ, the smaller the hysteresis loss and the better the low heat buildup.
耐摩耗性
１１種類のゴム組成物（実施例１〜５、比較例１〜６）を、リムクッション部に使用したタイヤサイズ１９５／６５Ｒ１５の空気入りタイヤをそれぞれ製作した。これらの空気入りタイヤをリム（サイズ１５×６．０Ｊ）に装着し、空気圧１２０ｋＰａにして室内ドラム試験機に取り付け、荷重７．０ｋＮの条件下で、時速８０ｋｍ／時で２０時間走行させた後、リムクッション部の摩耗量を測定し、その摩耗量の逆数を比較例１を１００とする指数値で評価した。この値が大きいほど、摩耗量が少なく、耐摩耗性が優れている。
Abrasion Resistance Pneumatic tires of tire size 195 / 65R15 using 11 types of rubber compositions (Examples 1 to 5 and Comparative Examples 1 to 6) in the rim cushion portion were manufactured. After mounting these pneumatic tires on a rim (size 15 × 6.0J), attaching them to an indoor drum tester with an air pressure of 120 kPa, and running for 20 hours at a speed of 80 km / h under a load of 7.0 kN The wear amount of the rim cushion portion was measured, and the reciprocal of the wear amount was evaluated by an index value with Comparative Example 1 being 100. The larger this value, the smaller the amount of wear and the better the wear resistance.
なお、表１において使用した原材料の種類を下記に示す。
ＮＲ：天然ゴム、ＲＳＳ＃１
ＢＲ：ブタジエンゴム、日本ゼオン社製Ｎｉｐｏｌ ＢＲ−１２２０
再生ゴム１：Ｇｕｊａｒａｔ社製ＧＲ５５５、（ムーニー粘度（ＭＬ１＋４＠１００℃）＝４５、ゴム成分中の天然ゴム比率＝８０％、ゾルの重量平均分子量＝３００００）
再生ゴム２：村岡ゴム工業社製ＴＢＲ１００％タイヤリク、（ムーニー粘度（ＭＬ１＋４＠１００℃）＝６０、ゴム成分中の天然ゴム比率＝８０％、ゾルの重量平均分子量＝６００００）
再生ゴム３：アセトン抽出量４．５重量％、クロロホルム抽出量２．２重量％の加硫ゴム（ＮＲ／ＢＲの重量比が８０／２０のもの）を１８０℃に温調したラボプラストミル（容積６０ｃｃ）で４分間せん断をかけて脱硫し作製したもの、（ムーニー粘度（ＭＬ１＋４＠１００℃）＝７０、ゴム成分中の天然ゴム比率＝８０％、ゾルの重量平均分子量＝２０００００）
再生ゴム４：アセトン抽出量４．５重量％、クロロホルム抽出量２．２重量％の加硫ゴム（ＮＲ／ＢＲの重量比が２０／８０のもの）を１８０℃に温調したラボプラストミル（容積６０ｃｃ）で８分間せん断をかけて脱硫し作製したもの、（ムーニー粘度（ＭＬ１＋４＠１００℃）＝４０、ゴム成分中の天然ゴム比率＝２０％、ゾルの重量平均分子量＝３００００）
カーボンブラック１：東海カーボン社製シーストＮ（窒素吸着比表面積７５ｍ２／ｇ）
カーボンブラック２：東海カーボン社製シーストＦ（窒素吸着比表面積４０ｍ２／ｇ）
亜鉛華：正同化学工業社製酸化亜鉛３種
ステアリン酸：日本油脂社製ビーズステアリン酸
オイル：昭和シェル石油社製エキストラクト４号Ｓ
硫黄：鶴見化学工業社製金華印油入微粉硫黄
加硫促進剤：大内新興化学工業社製ノクセラーＣＺ−Ｇ
In addition, the kind of raw material used in Table 1 is shown below.
NR: natural rubber, RSS # 1
BR: butadiene rubber, Nipol BR-1220 manufactured by Nippon Zeon
Recycled rubber 1: GR555 manufactured by Gujarat, (Mooney viscosity (ML 1 + 4 @ 100 ° C.) = 45, natural rubber ratio in rubber component = 80%, weight average molecular weight of sol = 30000)
Recycled rubber 2: TBR 100% tire Riku, manufactured by Muraoka Rubber Industries, Ltd. (Mooney viscosity (ML 1 + 4 @ 100 ° C.) = 60, natural rubber ratio in rubber component = 80%, weight average molecular weight of sol = 60,000)
Recycled rubber 3: Laboplast mill (at a weight ratio of NR / BR of 80/20) vulcanized rubber with an acetone extraction amount of 4.5% by weight and a chloroform extraction amount of 2.2% by weight adjusted to 180 ° C. Desulfurized and produced by shearing for 4 minutes at a volume of 60 cc) (Mooney viscosity (ML 1 + 4 @ 100 ° C.) = 70, natural rubber ratio in rubber component = 80%, weight average molecular weight of sol = 200000)
Recycled rubber 4: Laboplast mill (at a weight ratio of NR / BR of 20/80) vulcanized rubber having an acetone extraction amount of 4.5% by weight and a chloroform extraction amount of 2.2% by weight adjusted to 180 ° C. Desulfurized by shearing for 8 minutes at a volume of 60 cc) (Mooney viscosity (ML 1 + 4 @ 100 ° C.) = 40, natural rubber ratio in rubber component = 20%, weight average molecular weight of sol = 30000)
Carbon black 1: Seest N (nitrogen adsorption specific surface area 75 m 2 / g) manufactured by Tokai Carbon Co., Ltd.
Carbon Black 2: Seast F manufactured by Tokai Carbon Co., Ltd. (nitrogen adsorption specific surface area 40 m 2 / g)
Zinc Hana: Zinc Oxide 3 types manufactured by Shodo Chemical Industry Co., Ltd. Stearate: Beads manufactured by Nippon Oil & Fats Co., Ltd .: Stearate Oil: Extract No. 4 S manufactured by Showa Shell Sekiyu K.K.
Sulfur: Fine powder sulfur vulcanization accelerator with Jinhua seal oil manufactured by Tsurumi Chemical Co., Ltd .: Noxeller CZ-G manufactured by Ouchi Shinsei Chemical Co., Ltd.
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| JP4087510B2 (en) * | 1998-06-25 | 2008-05-21 | 住友ゴム工業株式会社 | Constant viscosity recycled rubber-containing rubber composition |
| JP2003072313A (en) * | 2001-08-31 | 2003-03-12 | Yokohama Rubber Co Ltd:The | Tire for passenger car |
| JP2008050442A (en) * | 2006-08-23 | 2008-03-06 | Yokohama Rubber Co Ltd:The | Rubber composition for tire and pneumatic tire in which the same composition is used for rim cushion |
| JP5487559B2 (en) * | 2008-05-01 | 2014-05-07 | 横浜ゴム株式会社 | Rubber composition for sidewall |
| JP5353050B2 (en) * | 2008-05-01 | 2013-11-27 | 横浜ゴム株式会社 | Rubber composition for bead filler |
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