A cross-linked rubber product for a fuel seal is obtained by cross-linking a nitrile rubber composition including a nitrile rubber (A) containing 25 to 80% by weight of α,β-ethylenically unsaturated nitrile monomer units (a1), 20 to 75% by weight of conjugated diene monomer units (a2), and 0 to 30% by weight of cationic monomer units and/or monomer units capable of forming a cation (a3), and having a compression set ratio of 20% or less after being compressed in an atmosphere of 100° C. for 70 hours, and an inorganic filler (B) having an aspect ratio of 30 to 2,000. The content of the inorganic filler (B) is from 1 to 200 parts by weight with respect to 100 parts by weight of the nitrile rubber (A). The cross-linked rubber product is obtained by subjecting the nitrile rubber composition to secondary vulcanization at 100 to 150° C. for 1 to 24 hours.
一种用于燃料密封件的交联橡胶产品是通过交联
丁腈橡胶组合物获得的,该组合物包括
丁腈橡胶 (A),其中含有 25% 至 80% (按重量计)的α,β-
乙烯基不饱和
丁腈单体单元 (a1)、20% 至 75% (按重量计)的共轭二烯单体单元 (a2),以及 0% 至 30% (按重量计)的
阳离子单体单元和/或能够形成阳离子的单体单元 (a3),在 100° C 的大气中压缩 70 小时后,压缩永久变形率为 20% 或更低。70小时,无机填料(B)的长宽比为30至2,000。相对于 100 重量份的
丁腈橡胶(A),无机填料(B)的含量为 1 至 200 重量份。将
丁腈橡胶组合物在 100 至 150 摄氏度下二次
硫化 1 至 24 小时,即可获得交联橡胶产品。