EPDM rabara (ethylene propylene diene monomer rabara) ke mofuta oa rabara ea maiketsetso e sebelisoang lits'ebetsong tse ngata.Diene tse sebelisoang ha ho etsoa liraba tsa EPDM ke ethylidene norbornene (ENB), dicyclopentadiene (DCPD), le vinyl norbornene (VNB).4-8% ea li-monomers tsena hangata li sebelisoa.EPDM ke M-Class rabara tlas'a ASTM standard D-1418;sehlopha sa M se na le li-elastomer tse nang le ketane e tletseng ea mofuta oa polyethylene (M e tsoang lentsoeng le nepahetseng haholoanyane la polymethylene).EPDM e entsoe ka ethylene, propylene, le diene comonomer e nolofalletsang ho tšela ka sulfur vulcanization.Setsoalle sa pejana sa EPDM ke EPR, rabara ea ethylene propylene (e sebetsang bakeng sa likhoele tsa motlakase tse matla haholo), e sa tsoetsoeng ho li-precursors leha e le life tsa diene mme e ka kopanngoa feela ho sebelisa mekhoa e matla e kang peroxides.
Joalo ka liraba tse ngata, EPDM e lula e sebelisoa e kopantsoe le li-fillers tse kang carbon black le calcium carbonate, tse nang le li-plasticiser tse kang oli ea paraffinic, 'me e na le lisebelisoa tse molemo tsa rabara feela ha li kopane.Crosslinking hangata e etsahala ka vulcanisation le sebabole, empa hape e finyelloa ka peroxides (bakeng sa ho hanyetsa mocheso hamolemo) kapa ka li-phenolic resin.Mahlaseli a matla a phahameng joalo ka maballo a elektrone ka linako tse ling a sebelisoa bakeng sa ho hlahisa foam le terata le thapo.
Nako ea poso: May-15-2023