Combination Of Fluororubber And IR

- Nov 10, 2020-

The use of cis-1,4-polyisoprene and fluororubber with different structures can be used to produce rubber seals. In this kind of compound, the content of fluororubber is 50 phr, polyisoprene is continuous phase, so the rubber has good cold resistance, but the rubber has poor oil resistance. If this kind of compound was vulcanized by unconventional method under the dynamic regulation of applied shear stress, the dynamic vulcanization of one component in the blend is a new method to prepare rubber with excellent comprehensive properties. The oil resistance and cold resistance of FPM / IR blends can also be controlled by this method. FPM / IR was crosslinked with sulfur curing system and salicylidene copper (o-benzylimine copper C mm). C HM has only weak crosslinking effect on polyisoprene, but sulfur, diphenylguanidine and accelerator DM have no crosslinking effect in fluororubber. Therefore, each group can be crosslinked in turn: fluororubber is crosslinked when the rubber is prepared at 150 ℃ under shear stress, while polyisoprene is crosslinked under the static condition. In order to improve the compatibility of isoprene rubber and FPM, oligomer modifier, i.e. sulfur containing amino silane resin or epoxy acrylic resin with relative molecular weight of 420, containing 25% - 27% methacrylate group and 3% epoxy group, can be used.