Ko te rapa EPDM (ethylene propylene diene monomer rubber) he momo rapa waihanga e whakamahia ana i roto i nga tono maha.Ko nga diene e whakamahia ana mo te hanga rapa EPDM ko te ethylidene norbornene (ENB), te dicyclopentadiene (DCPD), me te vinyl norbornene (VNB).4-8% o enei monomers e whakamahia ana.Ko te EPDM he rapa M-Class i raro i te paerewa ASTM D-1418;kei roto i te akomanga M nga elastomers he mekameka kukū o te momo polyethylene (ko te M i ahu mai i te kupu polymethylene tika ake).He mea hanga te EPDM mai i te ethylene, propylene, me te comonomer diene e taea ai te hono whakawhiti ma te whakangao whanariki.Ko te whanaunga o mua o te EPDM ko te EPR, te rapa ethylene propylene (he mea whai hua mo nga taura hiko ngaohiko teitei), kaore i ahu mai i nga tohu o mua o te diene ka taea anake te whakawhiti ma te whakamahi i nga tikanga tuwhena penei i te peroxides.
Pērā i te nuinga o ngā rapa, ka whakamahia tonu te EPDM ki te whakakī i te waro pango me te konupūmā warowaihā, me te whakahiato kirihou penei i te hinu paraffinic, me te whai hua rapa noa ina honoa.Ko te hononga whakawhiti te nuinga ka mahia ma te whakangao me te whanariki, engari ka mahia ano ki te peroxides (mo te pai ake o te wera) me te kapia phenolic ranei.I etahi wa ka whakamahia te iraruke hiko nui penei i nga kurupae hiko mo te hanga pahuka me te waea me te taura.
Te wa tuku: Mei-15-2023