JP6026320B2 - ゴム組成物及び空気入りタイヤ - Google Patents
ゴム組成物及び空気入りタイヤ Download PDFInfo
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- JP6026320B2 JP6026320B2 JP2013045092A JP2013045092A JP6026320B2 JP 6026320 B2 JP6026320 B2 JP 6026320B2 JP 2013045092 A JP2013045092 A JP 2013045092A JP 2013045092 A JP2013045092 A JP 2013045092A JP 6026320 B2 JP6026320 B2 JP 6026320B2
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- rubber
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- polymer
- diene
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- 125000005647 linker group Chemical group 0.000 claims description 54
- 229920003244 diene elastomer Polymers 0.000 claims description 49
- 150000001993 dienes Chemical class 0.000 claims description 43
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- 239000005062 Polybutadiene Substances 0.000 claims description 8
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 8
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- 229910052799 carbon Inorganic materials 0.000 description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 21
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- -1 diene compounds Chemical class 0.000 description 20
- 244000043261 Hevea brasiliensis Species 0.000 description 17
- 229920003052 natural elastomer Polymers 0.000 description 17
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- 229960002447 thiram Drugs 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
変性ジエン系ゴムに関する各測定方法は、以下の通りである。
ゲルパーミエーションクロマトグラフィ(GPC)での測定により、ポリスチレン換算のMn、Mw及びMw/Mnを求めた。詳細には、測定試料は0.2mgをTHF1mLに溶解させたものを用いた。(株)島津製作所製「LC−20DA」を使用し、試料をフィルター透過後、温度40℃、流量0.7mL/分でカラム(Polymer Laboratories社製「PL Gel3μm Guard×2」)を通し、Spectra System社製「RI Detector」で検出した。
NNMRにより、連結基の含有率を測定した。NMRスペクトルは、BRUKER社製「400ULTRASHIELDTM PLUS」により測定した。ポリマー1gを重クロロホルム5mLに溶解し、緩和試薬としてアセチルアセトンクロム塩87mgを加え、NMR10mm管にて測定した。
東亜ディ−ケーケー(株)製のポータブルpH計「HM−30P型」を用いて測定した。
変性対象のジエン系ゴムとして、天然ゴムラテックス(レヂテックス社製「HA−NR」、DRC(Dry Rubber Content)=60質量%)を用いた。この天然ゴムラテックスに含まれる未変性の天然ゴムについて、分子量を測定したところ、重量平均分子量が202万、数平均分子量が51万、分子量分布が4.0であった。
合成例1において、1,3−ジビニル−1,1,3,3−テトラメチルジシラザンを添加せずに、過ヨウ素酸を加え、その他は合成例1と同様にして、変性ジエン系ゴムAを得た。結果を表1に示す。
変性対象のジエン系ゴムとして、スチレンブタジエンゴムラテックス(日本ゼオン(株)製「SBRラテックスLX110、DRC=50質量%)を用いた。スチレンブタジエンゴムラテックスに含まれる未変性のスチレンブタジエンゴムについて、分子量を測定したところ、重量平均分子量が68万、数平均分子量が32万、分子量分布が2.1であった。
合成例2において、1,3−ジビニル−1,1,3,3−テトラメチルジシラザンを添加せずに、過ヨウ素酸を加え、その他は合成例2と同様にして、変性ジエン系ゴムCを得た。結果を表1に示す。
上記で合成した変性ジエン系ゴムを用いてゴム組成物の評価を行った。詳細には、バンバリーミキサーを使用し、下記表2及び表3に示す配合(質量部)に従って、まず、第一混合段階で、ゴム成分に対し硫黄及び加硫促進剤を除く他の配合剤を添加し混練し、次いで、得られた混練物に、最終混合段階で、硫黄と加硫促進剤を添加し混練して、ゴム組成物を調製した。ゴム成分を除く、表2及び表3中の各成分の詳細は、以下の通りである。
・カーボンブラック:東海カーボン(株)製「シースト3」
・シランカップリング剤:ビス(3−トリエトキシシリルプロピル)テトラスルフィド、エボニック・デグサ社製「Si69」
・亜鉛華:三井金属鉱業(株)製「亜鉛華1種」
・プロセスオイル:株式会社ジャパンエナジー製「X−140」
・老化防止剤:大内新興化学工業(株)製「ノクラック6C」
・ステアリン酸:花王(株)製「ルナックS−20」
・硫黄:細井化学工業(株)製「ゴム用粉末硫黄150メッシュ」
・加硫促進剤:大内新興化学工業(株)製「ノクセラーCZ」
Claims (7)
- 前記ジエン系ポリマー鎖が、ポリイソプレン鎖、スチレンブタジエン共重合体鎖及びポリブタジエン鎖からなる群より選択された少なくとも1種である、ことを特徴とする請求項1〜3のいずれか1項に記載のゴム組成物。
- タイヤ用ゴム組成物である、請求項1〜4のいずれか1項に記載のゴム組成物。
- 請求項5記載のゴム組成物を用いてなる空気入りタイヤ。
- 前記ゴム組成物をトレッドに用いた請求項6記載の空気入りタイヤ。
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