Kodi mphira wa EPDM ndi chiyani?

1. Kutsika kochepa komanso kudzaza kwakukulu
Ethylene-propylene rabara ndi mphira wokhala ndi kachulukidwe kakang'ono, wokhala ndi kachulukidwe ka 0,87.Kuonjezera apo, ikhoza kudzazidwa ndi mafuta ambiri ndi EPDM.
Kuwonjezera zodzaza kumatha kuchepetsa mtengo wazinthu zamphira ndikupanga mphira wokwera wa ethylene propylene rabara yaiwisi.Kwa mphira wa ethylene propylene wokhala ndi mtengo wapamwamba wa Mooney, mphamvu zakuthupi ndi zamakina zodzaza kwambiri sizimachepetsedwa kwambiri.

2. Kukana kukalamba
Ethylene-propylene rabara imakhala ndi nyengo yabwino kwambiri yolimbana ndi nyengo, kukana kwa ozoni, kukana kutentha, asidi ndi alkali kukana, kukana kwa nthunzi wamadzi, kukhazikika kwamtundu, mphamvu zamagetsi, katundu wodzaza mafuta ndi madzi otentha kutentha.Zopangira mphira za ethylene-propylene zitha kugwiritsidwa ntchito kwa nthawi yayitali pa 120 ° C, ndipo zitha kugwiritsidwa ntchito mwachidule kapena pafupipafupi pa 150-200 ° C.Kuwonjezera ma antioxidants oyenera kungapangitse kutentha kwake.EPDM mphira wolumikizidwa ndi peroxide angagwiritsidwe ntchito pamavuto.EPDM mphira akhoza kufika kuposa 150h popanda akulimbana pansi pa zikhalidwe za ozoni ndende 50phm ndi 30% kutambasula.

3. Kukana dzimbiri
Chifukwa mphira wa ethylene propylene ulibe polarity komanso unsaturation wochepa, umalimbana bwino ndi mankhwala osiyanasiyana a polar monga ma alcohols, acids, alkalis, oxidants, refrigerants, detergents, nyama ndi masamba mafuta, ketoni ndi mafuta.Koma imakhala yosakhazikika m'mafuta osungunulira mafuta ndi onunkhira (monga petulo, benzene, etc.) ndi mafuta amchere.Kuchitako kudzacheperanso pansi pakuchita kwanthawi yayitali kwa asidi wokhazikika.Mu ISO/TO 7620, pafupifupi mitundu 400 ya mankhwala owononga mpweya ndi madzi amadzimadzi yasonkhanitsa zidziwitso pamitundu yosiyanasiyana ya labala, ndikutchula milingo 1-4 kuti iwonetse momwe akugwirira ntchito, komanso kukhudzika kwa mankhwala owononga pamitengo ya rabala.

Mlingo wa Kutupa kwa Voliyumu /% Kuchepetsa Kuuma kwamtengo Kukhudzidwira ntchito
1 <10 <10 pang'ono kapena ayi
2 10-20 <20 zochepa
3 30-60 <30 sing'anga
4>60>30 kwambiri

4. Kukana kwa nthunzi wa madzi
Rabara ya ethylene-propylene imakhala ndi mphamvu yolimbana ndi nthunzi yamadzi ndipo imati ndi yabwino kuposa kukana kutentha kwake.Mu nthunzi yotentha kwambiri ya 230 ℃, mawonekedwe a EPDM sanasinthe pambuyo pa pafupifupi 100h.Komabe, pansi pazimenezi, labala la fluorine, labala la silikoni, labala la fluorosilicone, labala la butyl, labala la nitrile, ndi mphira wachilengedwe zinawonongeka kwambiri pakapita nthawi yochepa.

5. Kutentha kwakukulu kwa madzi
Ethylene-propylene rabara imakhalanso yabwino kukana madzi otentha kwambiri, koma imagwirizana kwambiri ndi machitidwe onse a vulcanization.Ethylene-propylene rabara ndi dimorpholine disulfide ndi TMTD monga dongosolo vulcanization, atatha kumizidwa m'madzi otentha kwambiri pa 125 ° C kwa miyezi 15, zida zamakina zimasintha pang'ono, ndipo kuchuluka kwa voliyumu ndi 0.3% yokha.

6. Kuchita kwamagetsi
Ethylene-propylene rabara imakhala ndi mphamvu zabwino kwambiri zotchinjiriza magetsi komanso kukana kwa corona, ndipo mphamvu zake zamagetsi ndizabwino kuposa kapena kuyandikira za rabara ya styrene-butadiene, chlorosulfonated polyethylene, polyethylene ndi polyethylene yolumikizana ndi mtanda.

7. Kusinthasintha
Chifukwa palibe ma polar olowa m'malo a mphira wa ethylene-propylene, mphamvu yolumikizana ya molekyulu ndi yotsika, ndipo unyolo wa mamolekyu ukhoza kukhalabe wosinthika mosiyanasiyana, wachiwiri ku mphira wachilengedwe komanso wa butadiene. anakhalabe pa otsika kutentha.

8. Kumamatira
Ethylene-propylene rabara alibe magulu ogwira ntchito chifukwa cha mapangidwe ake a maselo ndipo ali ndi mphamvu zochepa zogwirizanitsa.Kuphatikiza apo, mphirayo ndi wosavuta kuphuka, ndipo kudziphatika kwake komanso kumamatira ndizovuta kwambiri.