JP2016102150A - Rubber composition for tire bead insulation and pneumatic tire using the same - Google Patents

Rubber composition for tire bead insulation and pneumatic tire using the same Download PDF

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JP2016102150A
JP2016102150A JP2014241016A JP2014241016A JP2016102150A JP 2016102150 A JP2016102150 A JP 2016102150A JP 2014241016 A JP2014241016 A JP 2014241016A JP 2014241016 A JP2014241016 A JP 2014241016A JP 2016102150 A JP2016102150 A JP 2016102150A
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rubber
mass
tire
inorganic filler
parts
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Japanese (ja)
Inventor
強 野間口
Tsutomu Nomaguchi
強 野間口
克典 清水
Katsunori Shimizu
克典 清水
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Priority to JP2014241016A priority Critical patent/JP2016102150A/en
Priority to PCT/JP2015/083220 priority patent/WO2016084892A1/en
Publication of JP2016102150A publication Critical patent/JP2016102150A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/006—Additives being defined by their surface area

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PROBLEM TO BE SOLVED: To overcome a problem of deteriorating strength of a tire by blending a large amount of a recycled rubber because it is contaminant in the tire, especially a concern that effects by blending the recycled rubber become large because a bead insulation rubber has small amount of the rubber amount among tires, where an insulation rubber is required to be high hardness and high viscosity of an unvulcanized rubber, on the other hand use of the recycled rubber is desired from the viewpoint of reducing environmental load.SOLUTION: The above mentioned problem is solved by a rubber composition for tire bead insulation containing 100 pts.mass of diene rubber containing natural rubber of 60 pts.mass of more, 80 pts.mass of carbon black and 40 pts.mass of an inorganic filler with the total of carbon black and inorganic filler of 120 to 180 pts.mass and recycled rubber with 60 to 160 mesh of 4 to 50 mass% based on the inorganic filler.SELECTED DRAWING: None

Description

本発明は、タイヤビードインシュレーション用ゴム組成物およびそれを用いた空気入りタイヤに関するものであり、詳しくは、再生ゴムを有効に活用しつつ、タイヤビードインシュレーションに求められる諸特性を向上したタイヤビードインシュレーション用ゴム組成物およびそれを用いた空気入りタイヤに関するものである。   TECHNICAL FIELD The present invention relates to a rubber composition for tire bead insulation and a pneumatic tire using the same, and more particularly, a tire having various properties required for tire bead insulation improved while effectively using recycled rubber. The present invention relates to a rubber composition for bead insulation and a pneumatic tire using the same.

空気入りタイヤは左右一対のビード部およびサイドウォール部と、両サイドウォール部に連なるトレッド部から主に構成され、ビード部におけるビードコアは、複数本のビードワイヤとこれを被覆するインシュレーションゴムとから構成されている。インシュレーションゴムは、大きくヤング率が異なるビードワイヤを束ね、一体化するために高硬度であること、また、タイヤ製造中におけるビードワイヤの寸法安定性を確保するために未加硫のゴムが高粘度であることが求められている。そのため、タイヤビードインシュレーション用ゴム組成物には、カーボンブラック、無機充填剤および硫黄の多量配合が多く用いられている。   A pneumatic tire is mainly composed of a pair of left and right bead portions and sidewall portions, and a tread portion connected to both sidewall portions, and a bead core in the bead portion is composed of a plurality of bead wires and insulation rubber covering the bead wires. Has been. Insulation rubber has high hardness to bundle and integrate bead wires with large Young's modulus, and unvulcanized rubber has high viscosity to ensure dimensional stability of the bead wire during tire manufacture. There is a need to be. Therefore, a large amount of carbon black, inorganic filler, and sulfur are often used in the tire bead insulation rubber composition.

一方、近年においては、環境負荷低減の観点から、廃ゴム製品を例えば冷凍粉砕し粉末状にした再生ゴムの活用が望まれている。しかし、再生ゴムはタイヤ中で異物であるため、多量に配合するとタイヤの強度を悪化させる等の問題点があった。とくにビードインシュレーションゴムはタイヤの中でもゴム量が少量であるため、再生ゴムの配合による影響が大きくなる懸念がある。
なお、再生ゴムを用いたタイヤ用ゴム組成物に配合する従来技術としては、例えば下記特許文献１〜２が挙げられる。 On the other hand, in recent years, from the viewpoint of reducing the environmental load, it is desired to use recycled rubber obtained by, for example, freezing and grinding a waste rubber product into a powder form. However, since recycled rubber is a foreign substance in the tire, there are problems such as deterioration of the strength of the tire when blended in a large amount. In particular, since the bead insulation rubber has a small amount of rubber in the tire, there is a concern that the influence of the blending of the recycled rubber is increased.
In addition, as a prior art mix | blended with the rubber composition for tires using recycled rubber, the following patent documents 1-2 are mentioned, for example.

特許第５３８０９６２号公報Japanese Patent No. 5380962 特許第５４８７５５９号公報Japanese Patent No. 5487559

本発明の目的は、再生ゴムを有効に活用しつつ、タイヤビードインシュレーションに求められる諸特性を向上したタイヤビードインシュレーション用ゴム組成物およびそれを用いた空気入りタイヤを提供することにある。   An object of the present invention is to provide a rubber composition for tire bead insulation in which various properties required for tire bead insulation are improved while effectively using recycled rubber, and a pneumatic tire using the same.

本発明者らは鋭意研究を重ねた結果、特定の組成を有するジエン系ゴムにカーボンブラックの特定量、無機充填剤の特定量および特定の粒径を有する再生ゴムの特定量を配合することにより、上記課題を解決できることを見出し、本発明を完成することができた。
すなわち本発明は以下のとおりである。
１．天然ゴムを６０質量部以上含むジエン系ゴム１００質量部に対し、カーボンブラックを８０質量部以上および無機充填剤を４０質量部以上含み、前記カーボンブラックおよび無機充填剤の合計が１２０〜１８０質量部であり、さらに、６０〜１６０メッシュの再生ゴムを前記無機充填剤に対し、４〜５０質量％配合してなるタイヤビードインシュレーション用ゴム組成物。
２．前記１に記載のゴム組成物をタイヤビードインシュレーションに使用してなる空気入りタイヤ。 As a result of intensive studies, the present inventors have blended a specific amount of carbon black, a specific amount of inorganic filler, and a specific amount of recycled rubber having a specific particle size with a diene rubber having a specific composition. The present inventors have found that the above problems can be solved and have completed the present invention.
That is, the present invention is as follows.
1. 80 parts by mass or more of carbon black and 40 parts by mass or more of an inorganic filler with respect to 100 parts by mass of a diene rubber containing 60 parts by mass or more of natural rubber, and the total of the carbon black and the inorganic filler is 120 to 180 parts by mass. Further, a rubber composition for tire bead insulation obtained by blending 60 to 160 mesh recycled rubber with respect to the inorganic filler in an amount of 4 to 50% by mass.
2. A pneumatic tire obtained by using the rubber composition according to 1 for tire bead insulation.

本発明によれば、特定の組成を有するジエン系ゴムにカーボンブラックの特定量、無機充填剤の特定量および特定の粒径を有する再生ゴムの特定量を配合したので、再生ゴムを有効に活用しつつ、とくにタイヤビードインシュレーションに求められる粘度、硬度、ビードワイヤに対する接着性等の諸特性を向上したタイヤビードインシュレーション用ゴム組成物およびそれを用いた空気入りタイヤを提供することができる。   According to the present invention, a specific amount of carbon black, a specific amount of inorganic filler, and a specific amount of recycled rubber having a specific particle size are blended with a diene rubber having a specific composition, so that the recycled rubber is effectively utilized. However, it is possible to provide a rubber composition for tire bead insulation and a pneumatic tire using the same, which have improved various properties such as viscosity, hardness, adhesion to bead wire, etc. particularly required for tire bead insulation.

以下、本発明をさらに詳細に説明する。

（ジエン系ゴム）
本発明で使用されるジエン系ゴムは、天然ゴム（ＮＲ）を必須成分とする。ＮＲの配合量は、本発明の効果の観点から、ジエン系ゴム全体を１００質量部としたときに６０質量部以上であることが必要であり、８０〜１００質量部が好ましい。ＮＲの配合量が６０質量部未満であると、破断伸び発熱性が悪化し、好ましくない。なお、ＮＲ以外にも他のジエン系ゴムを用いることができ、例えば、イソプレンゴム（ＩＲ）、ブタジエンゴム（ＢＲ）、スチレン−ブタジエン共重合体ゴム（ＳＢＲ）、アクリロニトリル−ブタジエン共重合体ゴム（ＮＢＲ）等が挙げられる。これらは、単独で用いてもよく、２種以上を併用してもよい。また、その分子量やミクロ構造はとくに制限されず、アミン、アミド、シリル、アルコキシシリル、カルボキシル、ヒドロキシル基等で末端変性されていても、エポキシ化されていてもよい。 Hereinafter, the present invention will be described in more detail.

(Diene rubber)
The diene rubber used in the present invention contains natural rubber (NR) as an essential component. From the viewpoint of the effect of the present invention, the blending amount of NR needs to be 60 parts by mass or more, preferably 80 to 100 parts by mass when the entire diene rubber is 100 parts by mass. When the blending amount of NR is less than 60 parts by mass, the elongation at break and the exothermic property deteriorate, which is not preferable. In addition to NR, other diene rubbers can be used. For example, isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene copolymer rubber (SBR), acrylonitrile-butadiene copolymer rubber ( NBR) and the like. These may be used alone or in combination of two or more. The molecular weight and microstructure are not particularly limited, and may be terminally modified with an amine, amide, silyl, alkoxysilyl, carboxyl, hydroxyl group or the like, or may be epoxidized.

（カーボンブラック）
本発明で使用されるカーボンブラックは特に制限されないが、本発明の効果の観点から、窒素吸着比表面積（Ｎ２ＳＡ）が３０〜１２５ｍ２／ｇであるものが好ましい。なお、窒素吸着比表面積（Ｎ２ＳＡ）はＪＩＳ Ｋ６２１７−２に準拠して求めた値である。 (Carbon black)
The carbon black used in the present invention is not particularly limited, but from the viewpoint of the effect of the present invention, those having a nitrogen adsorption specific surface area (N 2 SA) of 30 to 125 m 2 / g are preferable. The nitrogen adsorption specific surface area (N 2 SA) is a value determined in accordance with JIS K6217-2.

（無機充填剤）
無機充填剤としては、とくに制限されず、適宜選択すればよいが、例えばシリカ、クレー、タルク、炭酸カルシウム等を挙げることができる。 (Inorganic filler)
The inorganic filler is not particularly limited and may be appropriately selected. Examples thereof include silica, clay, talc, calcium carbonate and the like.

（再生ゴム）
本発明で使用される再生ゴムは、ＪＩＳ Ｋ６２２０に準拠して測定した粒径が、６０〜１６０メッシュであることが必要である。すなわち、本発明で使用される再生ゴムは、６０メッシュを通過し、かつ１６０メッシュを通過しない粒径のものから構成される。なお、上記粒径の範囲外のものも、本発明の効果を損なわない範囲で存在することができ、例えば本発明で使用される再生ゴムは、３０質量％以下の割合で、上記粒径の範囲外のものを含み得る。
前記粒径が６０メッシュ未満であると、粒径が大きすぎてビードワイヤに対する接着性が悪化し、逆に１６０メッシュを超えると、粒径が小さすぎて未加硫ゴムの粘度が極端に上昇し、加工性が悪化する。
さらに好ましい粒径は、８０〜１４０メッシュである。 (Recycled rubber)
The recycled rubber used in the present invention is required to have a particle size of 60 to 160 mesh measured in accordance with JIS K6220. That is, the recycled rubber used in the present invention is composed of a particle size that passes through 60 mesh and does not pass through 160 mesh. In addition, the thing outside the range of the above-mentioned particle size can exist in the range which does not impair the effect of the present invention. For example, the recycled rubber used in the present invention has a particle size of 30% by mass or less. Can include out of range.
If the particle size is less than 60 mesh, the particle size is too large and the adhesion to the bead wire deteriorates. Conversely, if it exceeds 160 mesh, the particle size is too small and the viscosity of the unvulcanized rubber increases extremely. , Workability deteriorates.
A more preferable particle size is 80 to 140 mesh.

（ゴム組成物の配合割合）
本発明のゴム組成物は、天然ゴムを６０質量部以上含むジエン系ゴム１００質量部に対し、カーボンブラックを８０質量部以上および無機充填剤を４０質量部以上含み、前記カーボンブラックおよび無機充填剤の合計が１２０〜１８０質量部であり、さらに、６０〜１６０メッシュの再生ゴムを前記無機充填剤に対し、４〜５０質量％配合してなることを特徴とする。
前記カーボンブラックの配合量が８０質量部未満であると、弾性率が悪化する。
前記無機充填剤の配合量が４０質量部未満であると、弾性率が悪化する。
前記カーボンブラックおよび無機充填剤の合計が１２０質量部未満であると、弾性率が悪化する。逆に１８０質量部を超えると、加工性が悪化する。
再生ゴムの配合量が無機充填剤に対し、４質量％未満であると、配合量が少ないため環境上有利にはなり難い。逆に５０質量％を超えると、ビードワイヤとの接着性が悪化する。 (Rubber composition ratio)
The rubber composition of the present invention contains 80 parts by mass or more of carbon black and 40 parts by mass or more of an inorganic filler with respect to 100 parts by mass of a diene rubber containing 60 parts by mass or more of natural rubber. The total is 120 to 180 parts by mass, and further, 60 to 160 mesh recycled rubber is blended in an amount of 4 to 50% by mass with respect to the inorganic filler.
When the blending amount of the carbon black is less than 80 parts by mass, the elastic modulus is deteriorated.
An elastic modulus will deteriorate that the compounding quantity of the said inorganic filler is less than 40 mass parts.
When the total of the carbon black and the inorganic filler is less than 120 parts by mass, the elastic modulus is deteriorated. On the other hand, when it exceeds 180 parts by mass, workability deteriorates.
When the blended amount of the recycled rubber is less than 4% by mass with respect to the inorganic filler, since the blended amount is small, it is difficult to be environmentally advantageous. Conversely, when it exceeds 50 mass%, adhesiveness with a bead wire will deteriorate.

さらに好ましい前記カーボンブラックの配合量は、ジエン系ゴム１００質量部に対し、８０〜１１０質量部である。
さらに好ましい前記無機充填剤の配合量は、ジエン系ゴム１００質量部に対し、４０〜７０質量部である。
さらに好ましい前記カーボンブラックおよび無機充填剤の合計は、ジエン系ゴム１００質量部に対し、１３０〜１６０質量部である。
さらに好ましい前記再生ゴムの配合量は、無機充填剤に対し、１０〜４０質量％である。 A more preferable blending amount of the carbon black is 80 to 110 parts by mass with respect to 100 parts by mass of the diene rubber.
A more preferable blending amount of the inorganic filler is 40 to 70 parts by mass with respect to 100 parts by mass of the diene rubber.
A more preferable total of the carbon black and the inorganic filler is 130 to 160 parts by mass with respect to 100 parts by mass of the diene rubber.
A more preferable blending amount of the recycled rubber is 10 to 40% by mass with respect to the inorganic filler.

本発明のゴム組成物には、前記した成分に加えて、加硫又は架橋剤、加硫又は架橋促進剤、各種オイル、老化防止剤、可塑剤などのゴム組成物に一般的に配合されてい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も、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 to the components described above, the rubber composition of the present invention is generally blended with a rubber composition such as a vulcanization or crosslinking agent, a vulcanization or crosslinking accelerator, various oils, an anti-aging agent, and a plasticizer. Various additives can be blended, and such additives can be kneaded by a general method to form a composition, which can be used for vulcanization or crosslinking. The blending amounts of these additives can be set to conventional general blending amounts as long as the object of the present invention is not violated.

また本発明のゴム組成物は従来の空気入りタイヤの製造方法に従って空気入りタイヤを製造するのに使用することができる。本発明のゴム組成物は、ビードインシュレーション用ゴムに好適に利用できる。   The rubber composition of the present invention can be used for producing a pneumatic tire according to a conventional method for producing a pneumatic tire. The rubber composition of the present invention can be suitably used as a bead insulation rubber.

以下、本発明を実施例および比較例によりさらに説明するが、本発明は下記例に制限されるものではない。   EXAMPLES Hereinafter, although an Example and a comparative example further demonstrate this invention, this invention is not restrict | limited to the following example.

実施例１〜６および比較例１〜２
サンプルの調製
表１に示す配合（質量部）において、加硫促進剤と硫黄を除く成分を１．７リットルの密閉式バンバリーミキサーで５分間混練した後、加硫促進剤および硫黄を加えてさらに混練し、ゴム組成物を得た。次に得られたゴム組成物を所定の金型中で１６０℃、２０分間プレス加硫して加硫ゴム試験片を得、以下に示す試験法で加硫ゴム試験片の物性を測定した。 Examples 1-6 and Comparative Examples 1-2
Sample Preparation In the formulation (parts by mass) shown in Table 1, the components except the vulcanization accelerator and sulfur were kneaded for 5 minutes with a 1.7 liter closed Banbury mixer, and then added with the vulcanization accelerator and sulfur. The rubber composition was obtained by kneading. Next, the obtained rubber composition was press vulcanized at 160 ° C. for 20 minutes in a predetermined mold to obtain a vulcanized rubber test piece, and the physical properties of the vulcanized rubber test piece were measured by the following test method.

ムーニー粘度：前記ゴム組成物を用い、ＪＩＳ Ｋ６３００に従い、１００℃における未加硫ゴムの粘度を測定した。結果は比較例１の値を１００として指数表示した。指数が大きいほど粘度が高く、タイヤ製造中におけるビードワイヤの寸法安定性を確保するのに良好であることを示す。
硬度（２０℃）：ＪＩＳ Ｋ６２５３に基づき、２０℃にて測定した。結果は、比較例１の値を１００として指数で示した。指数が大きいほど硬度が高いことを示す。
接着性能試験：１２．７ｍｍ間隔で平行に並べたブラスめっきスチールコードを上記ゴム組成物で被覆すると共に、埋め込み長さ１２．７ｍｍで埋め込み、１６０℃×２０分間の加硫条件で加硫接着してサンプルを作製した。ＡＳＴＭ Ｄ−１８７１に準拠して前記サンプルからスチールコードを引き抜き、引抜力を評価した。結果は、比較例１の値を１００として指数で示した。この指数が大きいほどゴムに対する接着性が優れていることを示す。
ビードワイヤの寸法安定性：上記ゴム組成物をビードインシュレーション用ゴムとして用いてタイヤ（タイヤサイズ：215/45R17）を作成し、完成したタイヤの周状４箇所でビードワイヤの最大幅を測定した。測定値の最大値と最小値の差を指数で示した。この指数が小さいほど寸法安定性が優れていることを示す。
結果を表１に併せて示す。

Mooney viscosity: The viscosity of unvulcanized rubber at 100 ° C. was measured in accordance with JIS K6300 using the rubber composition. The result was expressed as an index with the value of Comparative Example 1 as 100. The larger the index is, the higher the viscosity is, which indicates that it is better for ensuring the dimensional stability of the bead wire during tire manufacture.
Hardness (20 ° C.): Measured at 20 ° C. based on JIS K6253. The results are shown as an index with the value of Comparative Example 1 being 100. The larger the index, the higher the hardness.
Adhesion performance test: Brass plated steel cords arranged in parallel at 12.7 mm intervals were covered with the rubber composition, embedded at an embedding length of 12.7 mm, and vulcanized and bonded under vulcanization conditions of 160 ° C. for 20 minutes. A sample was prepared. The steel cord was pulled out from the sample in accordance with ASTM D-1871, and the pulling force was evaluated. The results are shown as an index with the value of Comparative Example 1 being 100. The larger this index, the better the adhesion to rubber.
Dimensional stability of bead wire: A tire (tire size: 215 / 45R17) was prepared using the rubber composition as a rubber for bead insulation, and the maximum width of the bead wire was measured at four circumferential positions of the completed tire. The difference between the maximum and minimum measured values was indicated by an index. The smaller this index, the better the dimensional stability.
The results are also shown in Table 1.

Figure 2016102150
Figure 2016102150

＊１：ＮＲ（ＳＴＲ２０）
＊２：ＳＢＲ（日本ゼオン（株）製Ｎｉｐｏｌ１５０２）
＊３：再生ゴム１（LEHIGH TECHNOLOGIES PD-80。ＪＩＳ Ｋ６２２０に準拠して測定した粒径が、８０メッシュ以上（８０メッシュふるい残分＝１０質量％未満、かつ６０メッシュふるい残分＝１質量％未満）
＊４：再生ゴム２（LEHIGH TECHNOLOGIES PD-140。ＪＩＳ Ｋ６２２０に準拠して測定した粒径が、１４０メッシュ以上（１４０メッシュふるい残分＝１０質量％未満、かつ１２０メッシュふるい残分＝１質量％未満）
＊５：カーボンブラック（新日化カーボン（株）製ニテロン＃Ｇ、窒素吸着比表面積（Ｎ２ＳＡ）＝３０ｍ２／ｇ）
＊６：クレー（山陽クレー工業（株）製カタルポＹ−Ｋ）
＊７：石油系樹脂（日本ゼオン（株）製クイントンＡ１００）
＊８：オイル（昭和シェル石油（株）製エキストラクト４号Ｓ）
＊９：酸化亜鉛（正同化学工業（株）製酸化亜鉛３種）
＊１０：工業用ステアリン酸（千葉脂肪酸（株）製工業用ステアリン酸）
＊１１：硫黄（鶴見化学工業（株）製金華印油入微粉硫黄）
＊１２：加硫促進剤（大内新興化学工業（株）製ノクセラーＮＳ−Ｐ） * 1: NR (STR20)
* 2: SBR (Nipol 1502 manufactured by Zeon Corporation)
* 3: Recycled rubber 1 (LEHIGH TECHNOLOGIES PD-80. Particle size measured according to JIS K6220 is 80 mesh or more (80 mesh sieve residue = less than 10% by mass and 60 mesh sieve residue = 1% by mass) Less than)
* 4: Recycled rubber 2 (LEHIGH TECHNOLOGIES PD-140. Particle size measured according to JIS K6220 is 140 mesh or more (140 mesh sieve residue = less than 10 mass% and 120 mesh sieve residue = 1 mass%) Less than)
* 5: Carbon black (Niteron Carbon Co., Ltd. Niteron #G, Nitrogen adsorption specific surface area (N 2 SA) = 30 m 2 / g)
* 6: Clay (Sanyo Clay Industry Co., Ltd. Catalpo Y-K)
* 7: Petroleum-based resin (Quinton A100 manufactured by Nippon Zeon Co., Ltd.)
* 8: Oil (Extract No. 4 S manufactured by Showa Shell Sekiyu KK)
* 9: Zinc oxide (3 types of zinc oxide manufactured by Shodo Chemical Industry Co., Ltd.)
* 10: Industrial stearic acid (industrial stearic acid manufactured by Chiba Fatty Acid Co., Ltd.)
* 11: Sulfur (Tsurumi Chemical Industry Co., Ltd. Jinhua Indian Oil Fine Powdered Sulfur)
* 12: Vulcanization accelerator (Noxeller NS-P manufactured by Ouchi Shinsei Chemical Co., Ltd.)

上記の表１から明らかなように、実施例１〜６で調製されたゴム組成物は、特定の組成を有するジエン系ゴムにカーボンブラックの特定量、無機充填剤の特定量および特定の粒径を有する再生ゴムの特定量を配合したので、再生ゴムを配合しない比較例１のゴム組成物と比べて、同等あるいはそれ以上の特性、とくに粘度、硬度、ビードワイヤに対する接着性等の諸特性を有することが分かる。したがって、実施例１〜５のゴム組成物は、タイヤビードインシュレーションゴムに好適に採用することができる。
これに対し、比較例２は、再生ゴムの配合量が本発明で規定する上限を超えているので、接着性が悪化した。 As is apparent from Table 1 above, the rubber compositions prepared in Examples 1 to 6 were a specific amount of carbon black, a specific amount of inorganic filler, and a specific particle size in a diene rubber having a specific composition. Since the specific amount of the recycled rubber having the above ratio is blended, the rubber composition of the comparative example 1 not blended with the recycled rubber has the same or higher characteristics, in particular, various properties such as viscosity, hardness, and adhesion to the bead wire. I understand that. Therefore, the rubber compositions of Examples 1 to 5 can be suitably used for tire bead insulation rubber.
On the other hand, in Comparative Example 2, since the blended amount of the recycled rubber exceeded the upper limit defined in the present invention, the adhesiveness deteriorated.

Claims (2)

天然ゴムを６０質量部以上含むジエン系ゴム１００質量部に対し、カーボンブラックを８０質量部以上および無機充填剤を４０質量部以上含み、前記カーボンブラックおよび無機充填剤の合計が１２０〜１８０質量部であり、さらに、６０〜１６０メッシュの再生ゴムを前記無機充填剤に対し、４〜５０質量％配合してなるタイヤビードインシュレーション用ゴム組成物。   80 parts by mass or more of carbon black and 40 parts by mass or more of an inorganic filler with respect to 100 parts by mass of a diene rubber containing 60 parts by mass or more of natural rubber, and the total of the carbon black and the inorganic filler is 120 to 180 parts by mass. Further, a rubber composition for tire bead insulation obtained by blending 60 to 160 mesh recycled rubber with respect to the inorganic filler in an amount of 4 to 50% by mass. 請求項１に記載のゴム組成物をタイヤビードインシュレーションに使用してなる空気入りタイヤ。   A pneumatic tire obtained by using the rubber composition according to claim 1 for tire bead insulation.
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JP2019026757A (en) * 2017-07-31 2019-02-21 横浜ゴム株式会社 Rubber composition for tire
JP2019188985A (en) * 2018-04-24 2019-10-31 横浜ゴム株式会社 Pneumatic tire
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JP2010132011A (en) * 2008-12-02 2010-06-17 Yokohama Rubber Co Ltd:The Rubber composition and pneumatic tire using it
JP2012062429A (en) * 2010-09-17 2012-03-29 Yokohama Rubber Co Ltd:The Rubber composition for rim cushion
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