Thermal Stability of FFKM Compounds

摘要

Compounds comprising a fluoroelastomer cured with peroxide curing agents and a metal sulfide, wherein the compounds comprise copolymerized units of unsaturated fluorinated olefins, a perfluoro(vinyl ether), and a cure site fluorinated monomer comprising one or more bromine atoms and/or one or more iodine atoms. Articles cured from these compounds; and processes of curing these compounds to result in articles.

主权项

1. A compound comprising:
A. a fluoroelastomer comprising copolymerized units of: (1) one or more unsaturated fluorinated olefins; (2) a fluorovinyl ether selected from the group consisting of perfluoro(alkyl vinyl) ethers, perfluoro(alkoxy vinyl) ethers, fluoro(alkyl vinyl) ethers, fluoro(alkoxy vinyl) ethers, and mixtures of these; and (3) one or more cure site fluorinated monomers, B. 0.1 to 20 parts per hundred parts fluoroelastomer A of a metal sulfide of formula (I):
M-S  (I) M being selected from Zn, Mg, Ca, Mn, Fe, and Cu; C. 0.1 to 10 parts per hundred parts fluoroelastomer A of a peroxide curing agent; D. 0.5 to 100 parts per hundred parts fluoroelastomer A of carbon black; E. 0.5 to 25 parts per hundred parts fluoroelastomer A of one or more fillers selected from the group consisting of nonperfluoro fluorine-containing elastomers, micropowders, anhydrous silica, acidic silica, and fumed silica; and F. 0.01 to 10 parts per hundred parts fluoroelastomer A of at least one co-agent; wherein, when the compound has been cured: the compression set of the cured compound, as measured in air at 168 hours according to method ASTM D395-89, ranges between 4% and 20% greater than the compression set, as measured for the same duration and by the same method, of an identical cured compound lacking element B.