JP5488363B2 - Rubber composition for rim cushion - Google Patents
Rubber composition for rim cushion Download PDFInfo
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- JP5488363B2 JP5488363B2 JP2010209163A JP2010209163A JP5488363B2 JP 5488363 B2 JP5488363 B2 JP 5488363B2 JP 2010209163 A JP2010209163 A JP 2010209163A JP 2010209163 A JP2010209163 A JP 2010209163A JP 5488363 B2 JP5488363 B2 JP 5488363B2
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- 229920001971 elastomer Polymers 0.000 title claims description 121
- 239000005060 rubber Substances 0.000 title claims description 121
- 239000000203 mixture Substances 0.000 title claims description 55
- 239000000843 powder Substances 0.000 claims description 45
- 239000006229 carbon black Substances 0.000 claims description 31
- 244000043261 Hevea brasiliensis Species 0.000 claims description 27
- 229920003052 natural elastomer Polymers 0.000 claims description 27
- 229920001194 natural rubber Polymers 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 229920003244 diene elastomer Polymers 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 239000004636 vulcanized rubber Substances 0.000 claims description 6
- 238000010298 pulverizing process Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 description 27
- 230000020169 heat generation Effects 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 238000002156 mixing Methods 0.000 description 13
- 239000005062 Polybutadiene Substances 0.000 description 9
- 229920002857 polybutadiene Polymers 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 5
- 238000005299 abrasion Methods 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
- 239000000654 additive Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920003048 styrene butadiene rubber Polymers 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
- 239000011324 bead Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000045 pyrolysis gas chromatography Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000000996 additive effect Effects 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 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
- 239000000446 fuel Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000008117 stearic acid Substances 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Description
本発明は、リムクッション用ゴム組成物に関し、更に詳しくは、環境負荷の低減を図るため粉末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、低発熱性及び押出加工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, achieves wear resistance, low heat build-up and extrudability at a conventional level or higher while blending powder rubber to reduce environmental burden. The present invention relates to a rubber composition for a rim 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、空気入りタイヤをホイールに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が望まれている。また、リムクッションは一般的に押出成形により、断面形状に鋭角部を含む薄肉形状に製造されるため押出加工性が優れることが求められる。 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. This rim cushion rubber must prevent the rim from slipping and keep the air sealability by fitting the rim seat rubber and the rim flange so that the rim cushion rubber fits closely to the rim seat and the rim flange. I must. For this reason, it is desired that the rubber composition constituting the rim cushion portion is excellent in wear resistance with respect to the rim and excellent in low exothermic property against compression deformation repeatedly applied during tire rotation. Moreover, since a rim cushion is generally manufactured by extrusion molding into a thin-walled shape including an acute angle portion in a cross-sectional shape, it is required to have excellent extrudability.
一方、地球環境を保護する観点から、近年、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、再生利用される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、このような粉末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る。また、粉末ゴムを配合したゴム組成物は、押出成形時にゴムの焼けが発生し易くなったり、エッジの再現性が低下したりするため、押出加工性が悪化するという問題がある。 On the other hand, from the viewpoint of protecting the global environment, in recent years, it has been required to increase the recycling rate of pneumatic tires, and powder rubber that is recovered from used tires and tubes and recycled can be used as a new rubber raw material. It has been proposed to blend in (for example, see Patent Document 1). However, when such powdered rubber is blended with a rubber composition for a rim cushion, there is a problem that wear resistance is lowered and tan δ is increased, and heat generation is deteriorated. Further, a rubber composition containing powdered rubber has a problem that extrudability deteriorates because rubber burning is likely to occur during extrusion molding, and edge reproducibility is reduced.
従って、リムクッションを構成するゴム組成物に粉末ゴムを配合してリサイクル率を高くしながら、粉末ゴムを配合しないときのレベル又はそれ以上の耐摩耗性、低発熱性及び押出加工性を維持するようにしたリムクッション用ゴム組成物が望まれている。 Therefore, while maintaining the recycle rate by blending powder rubber with the rubber composition constituting the rim cushion, the level of wear resistance, low heat build-up and extrudability at the level when powder rubber is not blended or higher are maintained. A rubber composition for a rim cushion is desired.
本発明の目的は、上述する問題点を解決するもので、リサイクル率を高め環境負荷の低減を図るため粉末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、低発熱性及び押出加工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。 The object of the present invention is to solve the above-mentioned problems. While blending powder rubber in order to increase the recycling rate and reduce the environmental load, wear resistance at a conventional level or higher, low heat generation, and extrusion processing An object of the present invention is to provide a rubber composition for a rim cushion which achieves the properties.
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３０〜６０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４０ｍ2／ｇ以上のカーボンブラックを７０〜９０重量部、粉末ゴムを１〜２５重量部配合すると共に、前記粉末ゴムが天然ゴムを７０重量％以上含むジエン系ゴムの加硫ゴムを粉砕した再生粉末ゴムであり、その粒径が９５μｍ以下、ポリマー含有比率が４２重量％以上、カーボンブラック含有比率が２５重量％以上３５重量％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 comprises 70 to 60 carbon black having a nitrogen adsorption specific surface area of 40 m 2 / g or more with respect to 100 parts by weight of a diene rubber containing 30 to 60% by weight of natural rubber. 90 parts by weight, 1 to 25 parts by weight of powdered rubber, and the powdered rubber is a recycled powdered rubber obtained by pulverizing a diene rubber vulcanized rubber containing 70% by weight or more of natural rubber, and its particle size is 95 μm or less The polymer content ratio is 42 wt% or more, and the carbon black content ratio is 25 wt% or more and 35 wt% or less.
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３０〜６０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４０ｍ2／ｇ以上のカーボンブラックを７０〜９０重量部、粉末ゴムを１〜２５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、低発熱性及び押出加工性を達成することが出来る。特に、粉末ゴムの性状を、天然ゴムを７０重量％以上含むジエン系ゴムの加硫ゴムを粉砕した再生粉末ゴムであり、その粒径が９５μｍ以下、ポリマー含有比率が４２重量％以上、カーボンブラック含有比率が２５重量％以上３５重量％以下にしたので、リムクッション用ゴム組成物の耐摩耗性を低下させず、かつ発熱性を維持し、更に押出加工性を良好に維持することが出来る。 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 40 m 2 / g or more per 100 parts by weight of diene rubber containing 30 to 60% by weight of natural rubber. Since 1 to 25 parts by weight of powder rubber is blended, it is possible to achieve wear resistance, low heat build-up, and extrusion processability at or above the level of conventional rim cushion rubber. In particular, the properties of powder rubber are recycled powder rubber obtained by pulverizing diene rubber vulcanized rubber containing 70% by weight or more of natural rubber, the particle size of which is 95 μm or less, the polymer content is 42% by weight or more, carbon black Since the content ratio is not less than 25% by weight and not more than 35% by weight, the wear resistance of the rubber composition for a rim cushion is not deteriorated, the exothermic property is maintained, and the extrudability is favorably maintained.
このリムクッション用ゴム組成物を使用した空気入りタイヤは、耐摩耗性を良好に維持すると共に、発熱性を向上することが出来る。 A pneumatic tire using the rubber composition for a rim cushion can maintain good wear resistance and improve heat generation.
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３０〜６０重量％、好ましくは４０〜５５重量％含むようにする。ジエン系ゴム中の天然ゴムが３０重量％未満であると押出加工性が低下する。また、天然ゴムが６０重量％を超えると発熱性、耐摩耗性が悪化すると共に押出加工性が低下する。尚、このゴム成分中の天然ゴムの含有量は、粉末ゴム中に含まれる天然ゴムの含有量を除いたものとする。 In the rubber composition for a rim cushion of the present invention, the rubber component is a diene rubber, and the diene rubber contains 30 to 60% by weight, preferably 40 to 55% by weight of natural rubber. When the natural rubber in the diene rubber is less than 30% by weight, the extrusion processability is lowered. Moreover, when natural rubber exceeds 60 weight%, exothermic property and abrasion resistance will deteriorate, and extrusion processability will fall. The content of natural rubber in this rubber component excludes the content of natural rubber contained in powder rubber.
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を使用すると良い。これら天然ゴム以外のジエン系ゴムは、単独又は任意のブレンドとして使用することが出来る。 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. Preferably, butadiene rubber is used. These diene rubbers other than natural rubber can be used alone or as an arbitrary blend.
本発明のリムクッション用ゴム組成物は上記ジエン系ゴムに粉末ゴムを配合する。粉末ゴムを配合することで環境貢献性を向上することが出来るが、一般的には、発熱性、耐摩耗性及び押出加工性が低下する。本発明のリムクッション用ゴム組成物においては、粉末ゴムの配合量を、ジエン系ゴム１００重量部に対して１〜２５重量部、好ましくは１０〜２０重量部にすることで、発熱性、耐摩耗性及び押出加工性の低下を抑えている。粉末ゴムの配合量が１重量部未満であると環境貢献性を向上することが出来ない。また、粉末ゴムの配合量が２５重量部を超えると発熱性、耐摩耗性及び押出加工性が悪化する。 In the rubber composition for a rim cushion of the present invention, powder rubber is blended with the diene rubber. Although the environmental contribution can be improved by blending the powder rubber, generally, the heat generation, wear resistance and extrusion processability are lowered. In the rubber composition for a rim cushion of the present invention, the blending amount of the powder rubber is 1 to 25 parts by weight, preferably 10 to 20 parts by weight with respect to 100 parts by weight of the diene rubber, so Reduces wear and extrusion processability. If the blending amount of the powder rubber is less than 1 part by weight, the environmental contribution cannot be improved. On the other hand, if the blending amount of the powder rubber exceeds 25 parts by weight, the heat generation, wear resistance and extrusion processability deteriorate.
本発明で使用する粉末ゴムとは、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や、これらのゴム製品の製造工程から出される加硫ゴムなどを粉砕し粉末状にした再生粉末ゴムである。この再生粉末ゴムの原料として使用する使用済みのゴムは特に限定されないが、好ましくはトラックバス用ラジアルタイヤのトレッド部を用いると良い。 The powder rubber used in the present invention is a recycled powder obtained by pulverizing used rubber of automobile tires, tubes and other rubber products, and vulcanized rubber produced from the manufacturing process of these rubber products. It is rubber. The used rubber used as a raw material for the recycled powder rubber is not particularly limited, but preferably a tread portion of a radial tire for a truck bus is used.
本発明のリムクッション用ゴム組成物は、使用する再生粉末ゴムの性状を下記のようにすることで、ゴム組成物の発熱性、耐摩耗性及び押出加工性を向上可能にする。 The rubber composition for a rim cushion of the present invention can improve the heat generation property, wear resistance, and extrusion processability of the rubber composition by making the properties of the recycled powder rubber used as follows.
粉末ゴム中のゴム成分は天然ゴム含有比率が７０重量％以上、好ましくは７５〜８５重量％である。天然ゴム含有比率が７０重量％未満であると耐摩耗性が低下すると共に発熱性が悪化し、かつ押出加工性が悪化する。尚、粉末ゴム中の天然ゴムの含有比率は、熱分解ガスクロマトグラフィー（ＰｙＧＣ）の測定により求めた。 The rubber component in the powder rubber has a natural rubber content of 70% by weight or more, preferably 75 to 85% by weight. When the content ratio of the natural rubber is less than 70% by weight, the wear resistance is lowered, the heat generation is deteriorated, and the extrusion processability is deteriorated. In addition, the content ratio of the natural rubber in powder rubber was calculated | required by the measurement of pyrolysis gas chromatography (PyGC).
本発明で使用する粉末ゴムは、その粒径を９５μｍ以下、好ましくは５０μｍ以下にする。粉末ゴムの粒径が９５μｍを超えると発熱性、耐摩耗性及び押出加工性が悪化する。粒径が９５μｍ以下の粉末ゴムとしては、１６６メッシュの篩を通過した粉末ゴムを用いることが出来る。 The powder rubber used in the present invention has a particle size of 95 μm or less, preferably 50 μm or less. When the particle diameter of the powder rubber exceeds 95 μm, the heat generation, wear resistance and extrusion processability deteriorate. As the powder rubber having a particle size of 95 μm or less, powder rubber having passed through a 166 mesh screen can be used.
本発明で使用する粉末ゴムは、粉末ゴム中のポリマー含有比率を４２重量％以上、好ましくは４５〜６０重量％にする。ポリマー含有比率が４２重量％未満であると発熱性、耐摩耗性及び押出加工性が悪化する。尚、粉末ゴム中のポリマー含有比率は、熱重量測定装置 ＴＧＡ(Ｔｈｅｒｍｏｇｒａｖｉｍｅｔｒｉｃ Ａｎａｌｙｚｅｒ)により算出した。 The powder rubber used in the present invention has a polymer content in the powder rubber of 42% by weight or more, preferably 45-60% by weight. If the polymer content is less than 42% by weight, the heat generation, wear resistance and extrusion processability deteriorate. The polymer content ratio in the powder rubber was calculated by a thermogravimetric analyzer TGA (Thermogravimetric Analyzer).
本発明で使用する粉末ゴムは、粉末ゴム中のカーボンブラック含有比率が２５〜３５重量％、好ましくは２７〜３３重量％にする。カーボンブラック含有比率が２５重量％未満であると耐摩耗性及び押出加工性が悪化する。カーボンブラック含有比率が３５重量％を超えると発熱性及び押出加工性が悪化する。尚、粉末ゴム中のカーボンブラック含有比率は、窒素下で８００℃で燃焼することで有機分を除去した粉末ゴムを酸素下で８００℃で燃焼し、酸素下での燃焼前後での重量差を測定することで求めた。 The powder rubber used in the present invention has a carbon black content in the powder rubber of 25 to 35% by weight, preferably 27 to 33% by weight. When the carbon black content is less than 25% by weight, the wear resistance and extrusion processability deteriorate. If the carbon black content exceeds 35% by weight, exothermic properties and extrudability are deteriorated. In addition, the carbon black content ratio in the powder rubber is determined by the weight difference between before and after the combustion under the oxygen under the condition that the powder rubber from which the organic component is removed by burning at 800 ° C. under the nitrogen is burned at 800 ° C. Obtained by measuring.
本発明のリムクッション用ゴム組成物において、カーボンブラックの配合量は、ジエン系ゴム１００重量部に対して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が７０重量部未満であると耐摩耗性及び押出加工性が悪化する。カーボンブラックの配合が９０重量部を超えると発熱性及び押出加工性が悪化する。 In the rubber composition for a rim cushion of the present invention, 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 and extrusion processability deteriorate. If the carbon black content exceeds 90 parts by weight, the exothermic property and extrusion processability deteriorate.
使用するカーボンブラックは、窒素吸着比表面積（Ｎ2ＳＡ）が４０ｍ2／ｇ以上、好ましくは４５〜９５ｍ2／ｇにする。カーボンブラックの窒素吸着比表面積が４０ｍ2／ｇ未満であると耐摩耗性及び押出加工性が悪化する。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 is a nitrogen adsorption specific surface area (N 2 SA) of 40 m 2 / g or more, preferably in 45~95m 2 / g. When the nitrogen adsorption specific surface area of carbon black is less than 40 m 2 / g, the wear resistance and the extrudability are deteriorated. The nitrogen adsorption specific surface area (N 2 SA) of carbon black shall be determined according to 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良い。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出来る。 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、本発明の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出来、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出来る。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出来る。 The rubber composition for a rim cushion of the present invention can be blended with various additives generally used in rubber compositions such as a vulcanizing agent, a vulcanization accelerator, an anti-aging agent, and a plasticizer. Such an additive can be kneaded by a general method to obtain a rubber composition which can be used for vulcanization or crosslinking. The blending amounts of these additives can be the conventional general blending amounts as long as the object of the present invention is not violated.
本発明の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出来る。 The rubber composition for a rim cushion of the present invention can be produced by mixing the above components using a known rubber kneading machine such as a Banbury mixer, a kneader, or a roll.
本発明のリムクッション用ゴム組成物は、粉末ゴムを使用して環境貢献性を高くしながら、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出来る。またゴム組成物は優れた押出加工性を有するため、品質が高い空気入りタイヤを安定的に製造することができる。本発明のリムクッション用ゴム組成物は、粉末ゴムを使用して環境貢献性を高くしながら、粉末ゴムを配合していないゴム組成物のレベルと同等以上の発熱性、耐摩耗性及び押出加工性を維持することができる。 The rubber composition for a rim cushion of the present invention can maintain the wear resistance at a high level while increasing the contribution to the environment by using a powder rubber, and can reduce the tan δ and reduce the heat generation. Further, since the rubber composition has excellent extrudability, a high-quality pneumatic tire can be stably produced. The rubber composition for a rim cushion of the present invention has high heat contribution, wear resistance, and extrusion processing equivalent to or higher than the level of a rubber composition not containing powder rubber while using powder rubber to increase environmental contribution. Sex can be maintained.
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、転がり抵抗が小さいため燃費性能を向上することが出来る。また空気入りタイヤの品質安定性が優れる。 This rubber composition for a rim cushion is preferably applied to a rim cushion portion, and a pneumatic tire having a rim cushion portion composed of this rubber composition is excellent in wear resistance and has low rolling resistance, resulting in fuel efficiency. Can be improved. In addition, the quality stability of the pneumatic tire is excellent.
以下、実施例によって本発明を更に説明するが、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、２に示す配合からなる１８種類のゴム組成物（比較例１〜１４、実施例１〜４）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。 18 kinds of rubber compositions (Comparative Examples 1 to 14 and Examples 1 to 4) composed of the compositions shown in Tables 1 and 2 were weighed for the ingredients except sulfur and a vulcanization accelerator, and 1.7 L Banbury The mixture was kneaded for 4 minutes with a mixer, and the master batch was discharged at a temperature of 160 ° C. and cooled to 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１８種類のゴム組成物を使用して、それぞれ所定形状の金型中で、１５０℃、３０分間加硫して加硫ゴムシートを作製し、発熱性、耐摩耗性、押出加工性をそれぞれ下記の方法により測定した。 Using the obtained 18 kinds of rubber compositions, vulcanized rubber sheets were produced by vulcanizing each mold in a predetermined shape at 150 ° C. for 30 minutes to produce heat, wear resistance, and extrudability. Were measured by the following methods.
発熱性；ｔａｎδ（６０℃）
得られた加硫ゴムシートの動的粘弾性をＪＩＳ Ｋ６３９４に準拠して、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、初期歪み１０％、振幅±２％、周波数２０Ｈｚで測定し、温度６０℃におけるｔａｎδを求めた。得られた結果は、比較例１を１００とする指数とする指数にし「発熱性」として表１，２に示した。この指数が小さいほどｔａｎδ（６０℃）が小さく、タイヤにしたとき発熱性が低く優れることを意味する。
Exothermic; tan δ (60 ° C)
The dynamic viscoelasticity of the obtained vulcanized rubber sheet was measured at an initial strain of 10%, an amplitude of ± 2%, and a frequency of 20 Hz using a viscoelastic spectrometer manufactured by Toyo Seiki Seisakusho in accordance with JIS K6394. Tan δ at 60 ° C. was determined. The obtained results are shown in Tables 1 and 2 as “exothermic properties” with the index of Comparative Example 1 as 100. The smaller this index, the smaller the tan δ (60 ° C.), and the lower the exothermicity when it is made into a tire, the better.
耐摩耗性
得られた試験片をＡＳＴＭ−Ｄ２２２８に準拠して、ピコ摩耗試験機を使用して摩耗量を測定した。得られた結果は、比較例１の値の逆数を１００とする指数で表わし「耐摩耗性」として表１，２に示した。この指数が大きいほど耐摩耗性に優れることを意味する。
Abrasion resistance The amount of wear of the obtained test piece was measured using a pico abrasion tester in accordance with ASTM-D2228. The obtained results are represented by an index with the reciprocal of the value of Comparative Example 1 being 100, and are shown in Tables 1 and 2 as “wear resistance”. It means that it is excellent in abrasion resistance, so that this index | exponent is large.
押出加工性
単軸押出機（ブラベンダー社製プラスティコーダー、スクリュー回転数４０ｒｐｍ、シリンダ温度１００℃）を用いて、ダイス形状が半径約１４ｍｍの円に内接する頂角約３０℃の二等辺三角形（頂点の曲率半径が０．２５ｍｍ）に近似したダイから、各ゴム組成物を２０秒押出したときの、押出物のエッジ切れの度合い及び薄肉部のゴム焼けをパネラー５人が５点満点で評価し、その平均値を求めた。評点が大きいほど押出加工性が優れることを意味する。
Extrudability Using a single-screw extruder (Plastacoder manufactured by Brabender, screw rotation speed 40 rpm, cylinder temperature 100 ° C), an isosceles triangle with an apex angle of about 30 ° C inscribed in a circle with a radius of about 14 mm When the rubber composition is extruded for 20 seconds from a die that approximates the radius of curvature of the apex (0.25 mm), the degree of edge breakage of the extrudate and the rubber burn of the thin wall portion are 5 points out of 5 points. The average value was evaluated. A larger score means better extrudability.
なお、表１、２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
粉末ゴム１：粒径５００μｍ（３０メッシュふるいを通過）、天然ゴム含有比率８０重量％、ブタジエンゴム含有比率２０重量％、ポリマー含有比率５５重量％、カーボンブラック含有比率２７重量％
粉末ゴム２：粒径１８８μｍ（８０メッシュふるいを通過）、天然ゴム含有比率８０重量％、ブタジエンゴム含有比率２０重量％、ポリマー含有比率５５重量％、カーボンブラック含有比率２７重量％
粉末ゴム３：粒径９０μｍ（１６６メッシュふるいを通過）、天然ゴム含有比率３０重量％、スチレンブタジエンゴム含有比率７０重量％、ポリマー含有比率５５重量％、カーボンブラック含有比率２７重量％
粉末ゴム４：粒径９０μｍ（１６６メッシュふるいを通過）、天然ゴム含有比率８０重量％、スチレンブタジエンゴム含有比率２０重量％、ポリマー含有比率４０重量％、カーボンブラック含有比率３５重量％
粉末ゴム５：粒径９０μｍ（１６６メッシュふるいを通過）、天然ゴム含有比率８０重量％、ブタジエンゴム含有比率２０重量％、ポリマー含有比率５５重量％、カーボンブラック含有比率２０重量％
粉末ゴム６：粒径９０μｍ（１６６メッシュふるいを通過）、天然ゴム含有比率８０重量％、ブタジエンゴム含有比率２０重量％、ポリマー含有比率５５重量％、カーボンブラック含有比率４０重量％
粉末ゴム７：粒径９０μｍ（１６６メッシュふるいを通過）、天然ゴム含有比率８０重量％、ブタジエンゴム含有比率２０重量％、ポリマー含有比率５５重量％、カーボンブラック含有比率３０重量％
ＣＢ１：カーボンブラック、東海カーボン社製シーストＮ、窒素吸着比表面積９０ｍ2／ｇ
ＣＢ２：カーボンブラック、タイカーボン社製ＴＨＡＩＢＬＡＣＫＮ６６０、窒素吸着比表面積３５ｍ2／ｇ
亜鉛華：正同化学工業社製酸化亜鉛３種
ステアリン酸：日油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
The types of raw materials used in Tables 1 and 2 are shown below.
NR: natural rubber, RSS # 1
BR: butadiene rubber, Nipol BR-1220 manufactured by Nippon Zeon
Powdered rubber 1: particle size 500 μm (passed through 30 mesh sieve), natural rubber content 80%, butadiene rubber content 20%, polymer content 55%, carbon black content 27%
Powdered rubber 2: particle size 188 μm (passed through 80 mesh sieve), natural rubber content 80%, butadiene rubber content 20%, polymer content 55%, carbon black content 27%
Powdered rubber 3: particle size 90 μm (passed through 166 mesh sieve), natural rubber content 30% by weight, styrene butadiene rubber content 70%, polymer content 55%, carbon black content 27%
Powdered rubber 4: particle size 90 μm (passed through 166 mesh screen), natural rubber content 80%, styrene butadiene rubber content 20%, polymer content 40%, carbon black content 35%
Powdered rubber 5: particle size 90 μm (passed through 166 mesh screen), natural rubber content 80%, butadiene rubber content 20%, polymer content 55%, carbon black content 20%
Powder rubber 6: particle size 90 μm (passed through 166 mesh sieve), natural rubber content 80% by weight, butadiene rubber content 20% by weight, polymer content 55% by weight, carbon black content 40% by weight
Powdered rubber 7: particle size 90 μm (pass through 166 mesh sieve), natural rubber content 80%, butadiene rubber content 20%, polymer content 55%, carbon black content 30%
CB1: Carbon black, Seast N made by Tokai Carbon Co., Nitrogen adsorption specific surface area 90 m 2 / g
CB2: Carbon black, THAIBLACKN660 manufactured by Thai Carbon Co., Nitrogen adsorption specific surface area 35 m 2 / g
Zinc Hana: Zinc Oxide 3 types manufactured by Shodo Chemical Industry Co., Ltd. Stearic Acid: Beads manufactured by NOF Corporation 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.
表１及び２の結果から明らかなように、実施例１〜４のリムクッション用ゴム組成物は、いずれも比較例１と比べ発熱性を改良すると共に、耐摩耗性及び押出加工性を良好に維持することが出来る。 As is clear from the results in Tables 1 and 2, the rubber compositions for rim cushions of Examples 1 to 4 all have improved heat resistance and good wear resistance and extrusion processability compared to Comparative Example 1. Can be maintained.
一方、表１の結果から明らかなように、比較例２〜４のリムクッション用ゴム組成物は、粉末ゴムの粒径が著しく大きいため発熱性、耐摩耗性及び押出加工性が悪化する。比較例５のリムクッション用ゴム組成物は、粉末ゴム中の天然ゴム成分が少ないため、発熱性、耐摩耗性及び押出加工性が悪化する。比較例６のリムクッション用ゴム組成物は、粉末ゴム中のポリマー分が少ないため、発熱性、耐摩耗性及び押出加工性が悪化する。比較例７のリムクッション用ゴム組成物は、粉末ゴム中のカーボンブラック量が少ないため、耐摩耗性及び押出加工性が低下する。比較例８のリムクッション用ゴム組成物は、粉末ゴム中のカーボンブラック量が多いため、発熱性及び押出加工性が悪化する。 On the other hand, as can be seen from the results in Table 1, the rubber compositions for rim cushions of Comparative Examples 2 to 4 are deteriorated in heat generation, wear resistance and extrusion processability because the powder rubber has a remarkably large particle size. Since the rubber composition for rim cushions of Comparative Example 5 has a small amount of natural rubber component in the powder rubber, heat generation, wear resistance and extrusion processability are deteriorated. Since the rubber composition for rim cushions of Comparative Example 6 has a small amount of polymer in the powder rubber, heat generation, wear resistance and extrusion processability are deteriorated. Since the rubber composition for rim cushions of Comparative Example 7 has a small amount of carbon black in the powder rubber, the wear resistance and extrusion processability are lowered. Since the rubber composition for rim cushions of Comparative Example 8 has a large amount of carbon black in the powder rubber, the heat generation property and the extrudability are deteriorated.
また、表２の結果から明らかなように、比較例９のリムクッション用ゴム組成物は、天然ゴムの配合量が少ないため押出加工性が低下する。比較例１０のリムクッション用ゴム組成物は、天然ゴムの配合量が多いため発熱性、耐摩耗性及び押出加工性が悪化する。比較例１１のリムクッション用ゴム組成物は、カーボンブラックの配合量が少ないため耐摩耗性及び押出加工性が低下する。比較例１２のリムクッション用ゴム組成物は、カーボンブラックの配合量が多いため発熱性及び押出加工性が悪化する。比較例１３のリムクッション用ゴム組成物は、カーボンブラックの窒素比表面積が小さいため、耐摩耗性及び押出加工性が低下する。比較例１４のリムクッション用ゴム組成物は、粉末ゴムの配合量が多いため発熱性、耐摩耗性及び押出加工性が低下する。 Further, as is apparent from the results in Table 2, the rubber composition for rim cushion of Comparative Example 9 has a low blending amount of natural rubber, so that the extrusion processability is lowered. Since the rubber composition for rim cushions of Comparative Example 10 has a large amount of natural rubber, heat generation, wear resistance, and extrusion processability deteriorate. Since the rubber composition for rim cushions of Comparative Example 11 has a small amount of carbon black, the wear resistance and extrusion processability are lowered. Since the rubber composition for rim cushions of Comparative Example 12 has a large amount of carbon black, the exothermic property and the extrudability are deteriorated. Since the rubber composition for rim cushions of Comparative Example 13 has a small nitrogen specific surface area of carbon black, wear resistance and extrusion processability are lowered. Since the rubber composition for rim cushions of Comparative Example 14 contains a large amount of powder rubber, the heat generation, wear resistance and extrusion processability are reduced.
Claims (2)
A pneumatic tire using the rubber composition for a rim cushion according to claim 1.
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| JP2016102150A (en) * | 2014-11-28 | 2016-06-02 | 横浜ゴム株式会社 | Rubber composition for tire bead insulation and pneumatic tire using the same |
| JP6439417B2 (en) * | 2014-12-03 | 2018-12-19 | 横浜ゴム株式会社 | Rubber composition and pneumatic tire using the same |
| US10286729B2 (en) * | 2015-04-07 | 2019-05-14 | Lehigh Technologies, Inc. | Tire having crack resistant sidewalls |
| JP6686317B2 (en) * | 2015-07-31 | 2020-04-22 | 横浜ゴム株式会社 | Rubber composition for rim cushion |
| FR3060586A1 (en) | 2016-12-20 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | TIRE HAVING AN EXTERNAL FLAN BASED ON A COMPOSITION COMPRISING A RUBBER POWDER |
| FR3060590A1 (en) * | 2016-12-20 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | RUBBER COMPOSITION COMPRISING A SPECIFIC RUBBER POWDER |
| FR3060588A1 (en) | 2016-12-20 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | RUBBER COMPOSITION COMPRISING A SPECIFIC RUBBER POWDER |
| FR3060587A1 (en) | 2016-12-20 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | RUBBER COMPOSITION COMPRISING A SPECIFIC RUBBER POWDER |
| FR3060589A1 (en) | 2016-12-20 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | RUBBER COMPOSITION COMPRISING A SPECIFIC RUBBER POWDER |
| FR3060591A1 (en) | 2016-12-20 | 2018-06-22 | Compagnie Generale Des Etablissements Michelin | RUBBER COMPOSITION COMPRISING A SPECIFIC RUBBER POWDER |
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| JP4342001B2 (en) * | 1998-03-23 | 2009-10-14 | 横浜ゴム株式会社 | Rubber composition for studless tire |
| JP4039735B2 (en) * | 1998-05-26 | 2008-01-30 | 横浜ゴム株式会社 | Rubber composition for tire |
| 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 |
| JP5223445B2 (en) * | 2008-05-01 | 2013-06-26 | 横浜ゴム株式会社 | Rubber composition for rim cushion |
| JP5477682B2 (en) * | 2008-12-04 | 2014-04-23 | 住友ゴム工業株式会社 | Process for producing rubber composition for base tread and pneumatic tire |
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