To provide a production method of a rubber composition for a tire, by which a rubber composition for tire can be obtained that is improved in dispersibility of silica and improved in high mileage property and wet grip performance in a balanced manner, while achieving good processability.SOLUTION: The production method of a rubber composition for a tire includes: a first base kneading step of kneading a rubber component, silica and a silane coupling agent; a second base kneading step of kneading a first kneaded material obtained in the first base kneading step with a vulcanization accelerator; a finish kneading step of kneading a second kneaded material obtained in the second base kneading step with a vulcanizer; and an extrusion step of extruding a third kneaded material obtained in the finish kneading step by use of an extruder. The extruder includes a cylinder, a screw and pins disposed to protrude on an inner surface of the cylinder, in which the pins are arranged as protruding in an average number of 8 to 15 per the pitch of the screw.SELECTED DRAWING: None
【課題】良好な加工性を得つつ、シリカの分散性を向上させ、低燃費性及びウェットグリップ性能がバランス良く改善されたタイヤ用ゴム組成物が得られるタイヤ用ゴム組成物の製造方法を提供する。【解決手段】ゴム成分、シリカ及びシランカップリング剤を混練する第一ベース練り工程と、前記第一ベース練り工程で得られた第一混練物及び加硫促進剤を混練する第二ベース練り工程と、前記第二ベース練り工程で得られた第二混練物及び加硫剤を混練する仕上げ練り工程と、押出機により、前記仕上げ練り工程で得られた第三混練物を押し出す押出工程とを含み、前記押出機は、シリンダ、スクリュー、及び前記シリンダの内面に突設したピンを備え、かつ前記ピンをスクリューピッチ毎に平均8〜15個突設したものであるタイヤ用ゴム組成物の製造方法。【選択図】なし
PRODUCTION METHOD OF RUBBER COMPOSITION FOR TIRE
タイヤ用ゴム組成物の製造方法
2019-02-07
Patent
Elektronische Ressource
Japanisch
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