申请人:Bridgestone Corporation
公开号:EP2623546A1
公开(公告)日:2013-08-07
The present invention is a method for producing a rubber composition containing a rubber component (A) of at least one selected from natural rubbers and synthetic dienic rubbers, a filler containing an inorganic filler (B), a silane coupling agent (C), at least one vulcanization accelerator (D) selected from guanidines, sulfenamides and thiazoles, and an organic acid compound (E), wherein the rubber composition is kneaded in plural stages, the rubber component (A), all or a part of the inorganic filler (B), all or a part of the silane coupling agent (C), the vulcanization accelerator (D) and the organic acid compound (E) are kneaded in the first stage of kneading, and the number of molecules X of the organic acid compound (E) in the rubber composition in the first stage is in a relation of the following formula [1] relative to the number of molecules Y of the vulcanization accelerator (D) therein. The production method enables production of a rubber composition having a low-heat-generation property while successfully preventing the coupling function activity of the silane coupling agent from lowering. 0 ≤ X ≤ 1.5 x Y [1]
本发明是一种生产橡胶组合物的方法,该橡胶组合物含有至少一种选自天然橡胶和合成二元橡胶的橡胶组分(A),一种含有无机填料(B)、硅烷偶联剂(C)、至少一种选自胍类、亚磺酰胺类和噻唑类的硫化促进剂(D)以及一种有机酸化合物(E)的填料,其中橡胶组合物分多个阶段捏合、在第一捏合阶段捏合橡胶成分(A)、全部或部分无机填料(B)、全部或部分硅烷偶联剂(C)、硫化促进剂(D)和有机酸化合物(E),且第一阶段橡胶组合物中有机酸化合物(E)的分子数 X 相对于其中硫化促进剂(D)的分子数 Y 的关系如下式[1]。该生产方法可生产出具有低发热特性的橡胶组合物,同时成功防止硅烷偶联剂的偶联功能活性降低。0 ≤ X ≤ 1.5 x Y [1]