申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0208314A2
公开(公告)日:1987-01-14
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(alkyl vinyl ether) units wheren the alkyl group contains 1-5 carbon atoms and (4) a cure-site monomer. Such fluoroelastomers 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. To prevent fluoroelastomers of the type described above, with or without units of ethylene, that contain a bromine-containing olefin as a peroxide cure site from sticking to the mold cavity when cured an N,N,N',N'-tetrasubstituted 1,8-diaminonaphthalene is added to the fluoroelastomer having the formula:
wherein R1, R2, R3 and R4 are independently alkyl groups of 1-6 carbon atoms, phenyl or benzyl, R, and R2 and/or R3 and R4 can be joined to form a 5- or 6-membered heterocyclic ring in which a carbon atom can be replaced by an oxygen or a sulfur atom, R, and R3 and/or R2 and R4 can be joined to form a heterocyclic ring of 6-20 carbon atoms in which a carbon atom can be replaced by an oxygen or a sulfur atom, X and Y are independently an alkyl group or an alkoxy group containing 1-4 carbon atoms and n is 0-3.
一种耐碱、基本无定形的氟弹性体,由以下成分组成:(1) 10-40 摩尔百分数的乙烯单元;(2) 32-60 摩尔百分数的四氟乙烯单元;(3) 20-40 摩尔百分数的全氟(烷基乙烯基醚)单元,其中烷基含有 1-5 个碳原子;(4) 一种固化位单体。这种氟弹性体能抵抗胺、强碱和硫化氢的侵蚀,同时具有良好的低温和高温性能,并能抵抗油膨胀。为了防止上述类型的含或不含乙烯单元的含溴烯烃作为过氧化物固化位点的氟弹性体在固化时粘在模腔上,在具有以下式子的氟弹性体中加入了 N,N,N',N'-四取代的 1,8-二氨基萘:
其中 R1、R2、R3 和 R4 独立地为 1-6 个碳原子的烷基、苯基或苄基,R 和 R2 和/或 R3 和 R4 可以连接形成 5 或 6 元杂环,其中一个碳原子可以被氧原子或硫原子取代,R、和 R3 和/或 R2 和 R4 可连接形成 6-20 个碳原子的杂环,其中一个碳原子可被氧原子或硫原子取代,X 和 Y 独立地为含 1-4 个碳原子的烷基或烷氧基,n 为 0-3。