CROSSLINKABLE FLUORINE RUBBER COMPOSITION, FLUORINE RUBBER MOLDED ARTICLE, AND METHOD FOR PRODUCING SAME
申请人:Daikin Industries, Ltd.
公开号:EP2765159A1
公开(公告)日:2014-08-13
An object of the present invention is to provide crosslinkable fluororubber compositions that provide fluororubber molded articles with low compression set and a low friction surface, molded articles obtainable by crosslinking such compositions, and a method for producing such a molded article.
The present invention provides a crosslinkable fluororubber composition containing:
a fluororubber (A); and
a fluororesin (B),
wherein the fluororesin (B) is a copolymer (B1) consisting of tetrafluoroethylene units (a) and hexafluoropropylene units (b) or a copolymer (B2) containing tetrafluoroethylene units (a), hexafluoropropylene units (b), and polymerized units (c) derived from a monomer copolymerizable with tetrafluoroethylene and hexafluoropropylene,
the copolymer (B1) satisfies the condition that the ratio (a)/(b) is (80.0 to 87.3)/(12.7 to 20.0) on a molar basis, and
the copolymer (B2) satisfies the condition that the ratio (a)/(b) is (80.0 to 90.0)/(10.0 to 20.0) on a molar basis, and the ratio (c)/(a)+(b)} is (0.1 to 10.0)/(90.0 to 99.9) on a molar basis.
本发明的目的是提供可交联的氟橡胶组合物,该组合物可提供具有低压缩永久变形和低摩擦表面的氟橡胶模制件、通过交联该组合物可获得的模制件,以及生产该模制件的方法。
本发明提供了一种可交联的氟橡胶组合物,其中含有
氟橡胶 (A);和
氟树脂 (B)、
其中,氟树脂 (B) 是由四氟乙烯单元 (a) 和六氟丙烯单元 (b) 组成的共聚物 (B1) 或含有四氟乙烯单元 (a)、六氟丙烯单元 (b) 和可与四氟乙烯和六氟丙烯共聚的单体衍生的聚合单元 (c) 的共聚物 (B2)、
共聚物(B1)满足以下条件:以摩尔为基准,(a)/(b)之比为(80.0 至 87.3)/(12.7 至 20.0),以及
共聚物 (B2) 满足以下条件:以摩尔为基准,(a)/(b) 的比率为 (80.0 至 90.0)/(10.0 至 20.0);以摩尔为基准,(c)/(a)+(b)} 的比率为 (0.1 至 10.0)/(90.0 至 99.9)。