The present invention provides the following low-swelling rubber composition and a molded article prepared therefrom: a low-swelling rubber composition comprising 100 parts by weight of a mixture (hereinafter referred to as "composition (A)") and 0.1 to 15 parts by weight of a peroxide crosslinking agent admixed therewith, the composition (A) comprising 5 to 95 wt.% of a peroxide-crosslinkable fluororubber containing vinylidene fluoride copolymerized therein in a proportion of 45 to 88 mole % and having a number average molecular weight of 5,000 to 200,000, and 95 to 5 wt.% of an acrylic rubber containing (i) 0.1 to 1.5 wt. % of a polyfunctional monomer copolymerized therein and having a functional group rendering the acrylic rubber peroxide-cocrosslinkable with the fluororubber and a functional group effecting the copolymerization of the monomer with a (meth)acrylic ester, (ii) 20 wt.% or more of (meth) acrylic alkoxy-substituted alkyl ester copolymerized therein and/or (iii) 4 wt.% or more of acrylonitrile copolymerized therein.
本发明提供了以下低膨胀橡胶组合物及其制备的模塑制品: 一种低膨胀橡胶组合物,包括按重量计100份的混合物(以下称为 "组合物(A)")和按重量计0.1 至 15 重量份的过氧化物
交联剂,该组合物 (A) 包括 5 至 95 重量份的过氧化物可交联
氟橡胶,其中含有以 45 至 88 摩尔 % 的比例共聚的亚
乙烯基氟化物,其平均分子量为 5,000 至 200,000 ;以及 95 至 5 重量份的
丙烯酸橡胶,其中含有(1)至(2)亚
乙烯基氟化物;(3)至(4)亚
乙烯基氟化物;(5)至(6)亚
乙烯基氟化物。(i) 0.1 至 1.5 重量%的多官能度单体共聚于其中,并具有使
丙烯酸橡胶可与
氟橡胶过氧化物交联的官能团和影响单体与(甲基)
丙烯酸酯共聚的官能团;(ii) 20 重量%或更多的(甲基)
丙烯酸酯共聚于其中,并具有使
丙烯酸橡胶可与
氟橡胶过氧化物交联的官能团和影响单体与(甲基)
丙烯酸酯共聚的官能团。%或更多的(甲基)
丙烯酸烷氧基取代烷基酯共聚和/或(iii) 4 重量%或更多的
丙烯腈共聚。