1. Kuchuluka kochepa komanso kudzaza kwakukulu
Rabala ya ethylene-propylene ndi rabala yokhala ndi kachulukidwe kochepa, yokhala ndi kachulukidwe ka 0.87. Kuphatikiza apo, imatha kudzazidwa ndi mafuta ambiri ndi EPDM.
Kuwonjezera zodzaza kungathandize kuchepetsa mtengo wa zinthu za rabara ndikuwonjezera mtengo wokwera wa rabara ya ethylene propylene. Pa rabara ya ethylene propylene yokhala ndi mtengo wapamwamba wa Mooney, mphamvu zakuthupi ndi zamakaniko zodzaza kwambiri sizimachepa kwambiri.
2. Kukana ukalamba
Rabala ya ethylene-propylene ili ndi kukana bwino kwa nyengo, kukana ozone, kukana kutentha, kukana asidi ndi alkali, kukana nthunzi ya madzi, kukhazikika kwa utoto, mphamvu zamagetsi, kudzaza mafuta komanso kusinthasintha kwa kutentha kwa chipinda. Zopangira za rabala ya ethylene-propylene zitha kugwiritsidwa ntchito kwa nthawi yayitali pa 120°C, ndipo zitha kugwiritsidwa ntchito kwakanthawi kapena pang'onopang'ono pa 150-200°C. Kuwonjezera ma antioxidants oyenera kungapangitse kutentha kwake kugwiritsidwa ntchito. Rabala ya EPDM yolumikizidwa ndi peroxide ingagwiritsidwe ntchito pamikhalidwe yovuta. Rabala ya EPDM imatha kufika maola opitilira 150 popanda kusweka pamikhalidwe ya ozone 50pphm ndi kutambasuka kwa 30%.
3. Kukana dzimbiri
Popeza rabara ya ethylene propylene ilibe polarity komanso mlingo wochepa wa kusakwanira, imakhala ndi kukana bwino kwa mankhwala osiyanasiyana a polar monga ma alcohols, ma acid, ma alkali, ma oxidants, ma refrigerants, sopo, mafuta a nyama ndi ndiwo zamasamba, ma ketones ndi mafuta. Koma ili ndi kukhazikika kochepa mu mafuta ndi zonunkhira zosungunulira (monga mafuta, benzene, ndi zina zotero) ndi mafuta a mchere. Kugwira ntchito kwake kudzachepanso chifukwa cha mphamvu yayitali ya asidi wokhazikika. Mu ISO/TO 7620, mitundu pafupifupi 400 ya mankhwala owononga a gasi ndi madzi asonkhanitsa zambiri za mitundu yosiyanasiyana ya rabara, ndipo yatchula milingo 1-4 kuti iwonetse kuchuluka kwa ntchito yawo, komanso momwe mankhwala owononga amakhudzira zinthu za rabara.
Kuchuluka kwa Kutupa/% Kuchepetsa Kulimba Kumakhudza magwiridwe antchito
1 <10 <10 pang'ono kapena ayi
2 10-20 <20 yaying'ono
3 30-60 <30 wapakati
4 >60 >30 kwambiri
4. Kukana nthunzi ya madzi
Rabala ya ethylene-propylene ili ndi mphamvu yabwino kwambiri yolimbana ndi nthunzi ya madzi ndipo akuti ndi yabwino kuposa kutentha kwake. Mu nthunzi yotentha kwambiri ya 230℃, mawonekedwe a EPDM sanasinthe patatha pafupifupi maola 100. Komabe, pansi pa mikhalidwe yomweyi, rabala ya fluorine, rabala ya silicone, rabala ya fluorosilicone, rabala ya butyl, rabala ya nitrile, ndi rabala yachilengedwe zinawonongeka kwambiri patatha nthawi yochepa.
5. Kukana madzi otentha kwambiri
Rabala ya ethylene-propylene ilinso ndi kukana bwino madzi otentha kwambiri, koma imagwirizana kwambiri ndi machitidwe onse ovulcanization. Rabala ya ethylene-propylene yokhala ndi dimorpholine disulfide ndi TMTD ngati dongosolo lovulcanization, itatha kumizidwa m'madzi otentha kwambiri pa 125°C kwa miyezi 15, mawonekedwe a makinawo sasintha kwenikweni, ndipo kuchuluka kwa voliyumu ndi 0.3% yokha.
6. Kugwira ntchito kwa magetsi
Rabala ya ethylene-propylene ili ndi mphamvu zabwino kwambiri zotetezera magetsi komanso kukana corona, ndipo mphamvu zake zamagetsi ndi zabwino kuposa kapena zofanana ndi za rabala ya styrene-butadiene, polyethylene ya chlorosulfonated, polyethylene ndi polyethylene yolumikizidwa.
7. Kusinthasintha
Popeza palibe zinthu zina zolowa m'malo mwa polar mu kapangidwe ka molekyulu ya rabara ya ethylene-propylene, mphamvu yogwirizana ya molekyuluyo ndi yochepa, ndipo unyolo wa molekyulu ukhoza kusunga kusinthasintha kwakukulu, kwachiwiri kwa rabara yachilengedwe yomwe ingakambidwenso komanso ya butadiene, ndipo ikhoza kusungidwabe kutentha kochepa.
8. Kumatira
Rabala ya ethylene-propylene ilibe magulu ogwira ntchito chifukwa cha kapangidwe kake ka mamolekyu ndipo ili ndi mphamvu zochepa zogwirizanitsa. Kuphatikiza apo, rabala ndi yosavuta kuphuka, ndipo kudzimamatira kwake ndi kugwirirana kwake ndizochepa kwambiri.
Nthawi yotumizira: Novembala-17-2021
