EPDM rabara (ethylene propylene diene monomer rabara) ndi mtundu wa mphira kupanga kuti ntchito zambiri ntchito.Zakudya zomwe zimagwiritsidwa ntchito popanga mphira wa EPDM ndi ethylidene norbornene (ENB), dicyclopentadiene (DCPD), ndi vinyl norbornene (VNB).4-8% mwa ma monomers awa amagwiritsidwa ntchito.EPDM ndi M-Makalasi mphira pansi ASTM muyezo D-1418;Gulu la M limapangidwa ndi ma elastomer okhala ndi tcheni chodzaza chamtundu wa polyethylene (M kuchokera ku mawu olondola kwambiri a polymethylene).EPDM imapangidwa kuchokera ku ethylene, propylene, ndi diene comonomer yomwe imathandizira kulumikizana kudzera pa sulfure vulcanization.Wachibale wakale wa EPDM ndi EPR, mphira wa ethylene propylene (wothandiza pazingwe zamagetsi zothamanga kwambiri), zomwe sizimachokera kuzinthu zoyambira za diene ndipo zimatha kulumikizidwa pogwiritsa ntchito njira zazikulu monga peroxides.
Mofanana ndi ma rubber ambiri, EPDM nthawi zonse imagwiritsidwa ntchito pophatikizana ndi zodzaza monga carbon black ndi calcium carbonate, zokhala ndi mapulasitiki monga mafuta a paraffinic, ndipo zimakhala ndi zida zothandiza za raba pokhapokha zitadutsa.Kuphatikizika kumachitika ndi vulcanisation ndi sulfure, komanso kumatheka ndi peroxides (kuti musamatenthedwe bwino) kapena ndi ma phenolic resins.Ma radiation amphamvu kwambiri monga ma elekitironi nthawi zina amagwiritsidwa ntchito popanga thovu ndi waya ndi chingwe.
Nthawi yotumiza: May-15-2023