Method for producing a rubber composition
A method for producing a rubber composition, the method comprising a step of producing a pre-kneaded rubber composition by kneading a butadiene-based rubber and 1 to 20 parts by weight of a silane coupling agent per 100 parts by weight of the butadiene-based rubber and a step of kneading the pre-kneaded rubber composition and 30 to 200 parts by weight of a silica per 100 parts by weight of the butadiene-based rubber used for producing the pre-kneaded rubber composition.
1. A method for producing a rubber composition, the method comprising a step of producing a pre-kneaded rubber composition by kneading a butadiene-based rubber and 1 to 20 parts by weight of a silane coupling agent per 100 parts by weight of the butadiene-based rubber, wherein no silica is kneaded together with the butadiene-based rubber and silane coupling agent and the pre-kneaded rubber composition contains no filler, and a step of kneading the pre-kneaded rubber composition and 30 to 200 parts by weight of a silica per 100 parts by weight of the butadiene-based rubber used for producing the pre-kneaded rubber composition.
2. The method according to claim 1 , wherein the silane coupling agent is an alkoxysilane compound having a sulfur-containing group.
3. The method according to claim 1 , wherein in the step of producing a pre-kneaded rubber composition, the butadiene-based rubber and the silane coupling agent are kneaded at 160° C. or lower for 1 to 20 minutes.
4. A method for producing a vulcanizable rubber composition, the method comprising a step of kneading a vulcanizing agent and a rubber composition produced by the method according to claim 1 .
5. A method for producing a vulcanized rubber composition, the method comprising a step of heating a vulcanizable rubber composition produced by the method according to claim 4 .
6. The method according to claim 2 , wherein in the step of producing a pre-kneaded rubber composition, the butadiene-based rubber and the silane coupling agent are kneaded at 160° C. or lower for 1 to 20 minutes.
7. A method for producing a vulcanizable rubber composition, the method comprising a step of kneading a vulcanizing agent and a rubber composition produced by the method according to claim 2 .
8. A method for producing a vulcanizable rubber composition, the method comprising a step of kneading a vulcanizing agent and a rubber composition produced by the method according to claim 3 .