Curable base-resistant fluoroelastomers

一种耐碱、基本无定形氟弹性体，包含(1)10～40mol％乙烯单元，(2)32～60mol％四氟乙烯单元，(3)20～40mol％选自全氟(烷基乙烯基醚)、全氟(烷基链烯基醚)和全氟(烷氧基链烯基醚)的全氟醚单元和(4)0.1～15mol％硫化部位单体，选自i)3，3，3-三氟-1-丙烯，ii)三氟乙烯，iii)1，2，3，3，3-五氟丙烯，iv)1，1，3，3，3-五氟丙烯，以及v)2，3，3，3-四氟丙烯。这类氟弹性体可用多羟基硫化剂进行硫化。所制成的硫化氟弹性体组合物耐胺、强碱和硫化氢的侵蚀并兼具有良好低温和高温性能，而且它们耐油溶胀。 A base resistant, substantially amorphous fluoroelastomer comprising (1) 10-40 mole percent ethylene units, (2) 32-60 mole percent tetrafluoroethylene units, (3) 20-40 mole percent perfluoro ether units selected from the group consisting of perfluoro(alkyl vinyl ethers), perfluoro(alkyl alkenyl ethers) and perfluoro(alkoxy alkenyl ethers), and (4) 0.1 to 15 mole percent of a cure site monomer selected from the group consisting of i) 3,3,3-trifluoropropene-1, ii) trifluoroethylene, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene. Such fluoroelastomers may be vulcanized with polyhydroxy curatives. The resulting vulcanized fluoroelastomer compositions are resistant to attack by amines, strong bases and hydrogen sulfide and possess a combination of good low temperature and high temperature properties and they are resistant to oil swell.