Zipangizo za rabara zomwe zimadziwika bwino——khalidwe la EPDM
Ubwino:
Kukana ukalamba bwino kwambiri, kukana nyengo, kutchinjiriza magetsi, kukana dzimbiri ndi mankhwala komanso kusinthasintha kwa mphamvu.
Zoyipa:
Liwiro lochepetsa kuuma; N'zovuta kusakaniza ndi ma rabara ena osakhuta, ndipo kudziphatika ndi kuphatikana ndi koipa kwambiri, kotero magwiridwe antchito ake ndi oipa.
Ningbo Yokey Automotive Parts Co., Ltd imayang'ana kwambiri kuthetsa mavuto a zinthu za rabara za makasitomala ndikupanga mitundu yosiyanasiyana ya zinthu kutengera momwe zinthuzo zimagwiritsidwira ntchito.
Katundu: tsatanetsatane
1. Kuchuluka kochepa komanso kudzaza kwakukulu
Rabala ya ethylene propylene ndi mtundu wa rabala yokhala ndi kachulukidwe kochepa ka 0.87. Kuphatikiza apo, mafuta ambiri amatha kudzazidwa ndipo zodzaza zitha kuwonjezeredwa, zomwe zingachepetse mtengo wa zinthu za rabala ndikulipira mtengo wokwera wa rabala ya ethylene propylene. Kuphatikiza apo, pa rabala ya ethylene propylene yokhala ndi mtengo wapamwamba wa Mooney, mphamvu zakuthupi ndi zamakanika pambuyo podzaza kwambiri sizingachepe kwambiri.
2. Kukana ukalamba
Rabala ya ethylene propylene imalimbana bwino ndi nyengo, kukana ozone, kukana kutentha, kukana asidi ndi alkali, kukana nthunzi ya madzi, kukhazikika kwa utoto, magwiridwe antchito amagetsi, kudzaza mafuta ndi kutentha kwa chipinda. Zopangira za rabala ya ethylene propylene zitha kugwiritsidwa ntchito kwa nthawi yayitali pa 120 ℃, ndipo zitha kugwiritsidwa ntchito kwakanthawi kapena pang'onopang'ono pa 150 - 200 ℃. Kutentha kogwiritsa ntchito kumatha kuwonjezeka powonjezera antioxidant yoyenera. EPDM yolumikizidwa ndi peroxide ingagwiritsidwe ntchito pansi pa mikhalidwe yovuta. Pamene kuchuluka kwa ozone kwa EPDM kuli 50 pphm ndipo nthawi yotambasula ndi 30%, EPDM imatha kufika maola 150 popanda kusweka.
3. Kukana dzimbiri
Chifukwa cha kusowa kwa polarity ndi kusakwanira pang'ono kwa rabara ya ethylene propylene, imakhala yolimba bwino ku mankhwala osiyanasiyana a polar monga mowa, asidi, alkali, oxidant, refrigerant, sopo, mafuta a nyama ndi ndiwo zamasamba, ketone ndi mafuta; Komabe, 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, deta yokhudza zotsatira za mankhwala pafupifupi 400 owononga a gasi ndi madzi pa katundu wa rabara zosiyanasiyana yasonkhanitsidwa, ndipo magiredi 1-4 afotokozedwa kuti asonyeze zotsatira zake. Zotsatira za mankhwala owononga pa katundu wa rabara ndi izi:
Zotsatira za Kuchepa kwa Kulimba kwa Kutupa kwa Magawo/% pa Katundu
1<10<10 Pang'ono kapena palibe
2 10-20<20 yaying'ono
3 30-60<30 Wapakati
4>60>30 kwambiri
4. Kukana nthunzi ya madzi
EPDM ili ndi kukana bwino kwa nthunzi ndipo akuti ndi yopambana kuposa kukana kwake kutentha. Mu nthunzi yotentha kwambiri ya 230 ℃, mawonekedwe ake sasintha patatha pafupifupi maola 100. Komabe, pansi pa mikhalidwe yomweyi, mawonekedwe a mphira wa fluorine, mphira wa silicon, mphira wa fluorosilicone, mphira wa butyl, mphira wa nitrile ndi mphira wachilengedwe adachepa kwambiri pakapita nthawi yochepa.
5. Kukana madzi otentha kwambiri
Mphira wa ethylene propylene ulinso ndi kukana bwino madzi otentha kwambiri, koma umagwirizana kwambiri ndi machitidwe onse ovulcanization. Kapangidwe ka makina a ethylene propylene rabara (EPR) yovulcanized ndi dimorphine disulfide ndi TMTD sanasinthe kwenikweni atamizidwa m'madzi otentha kwambiri a 125 ℃ kwa miyezi 15, ndipo kuchuluka kwa kuchuluka kwake kunali 0.3% yokha.
6. Kugwira ntchito kwa magetsi
Rabala ya ethylene propylene ili ndi mphamvu yabwino kwambiri yotetezera magetsi komanso kukana korona, ndipo mphamvu zake zamagetsi ndi zapamwamba kapena zofanana ndi za rabala ya styrene butadiene, polyethylene ya chlorosulfonated, polyethylene ndi polyethylene yolumikizidwa.
7. Kutanuka
Popeza rabara ya ethylene propylene ilibe zinthu zolowa m'malo mwa polar mu kapangidwe kake ka molekyulu komanso mphamvu yochepa yogwirizana ndi mamolekyulu, unyolo wake wa mamolekyulu umatha kusunga kusinthasintha kwakukulu, pambuyo pa rabara yachilengedwe ndi rabara ya cis polybutadiene, ndipo ukhozabe kukhalabe kutentha kochepa.
8. Kumatira
Chifukwa cha kusowa kwa magulu ogwira ntchito mu kapangidwe ka mamolekyu a rabara ya ethylene propylene, mphamvu yogwirizana ndi yochepa, ndipo rabara ndi yosavuta kupopera, kotero kudziphatika ndi kugwirizana ndi kofooka kwambiri.
Nthawi yotumizira: Okutobala-10-2022