Zida za rabara wamba——makhalidwe a EPDM

Zida za rabara wamba——makhalidwe a EPDM

Ubwino:
Kukana kukalamba kwabwino kwambiri, kukana nyengo, kutsekereza magetsi, kukana kwa dzimbiri kwamankhwala komanso kusinthasintha kwamphamvu.

Zoyipa:
Kuthamanga kwapang'onopang'ono; Ndizovuta kusakaniza ndi mphira zina zopanda unsaturated, ndipo kudzimangiriza ndi kumamatira pamodzi ndizosauka kwambiri, kotero kuti kachitidwe kake kamakhala kosavuta.

Ningbo Yokey Automotive Parts Co., Ltd imayang'ana kwambiri kuthetsa mavuto amtundu wa mphira wamakasitomala ndikupanga mitundu yosiyanasiyana yazinthu kutengera zochitika zosiyanasiyana zogwiritsira ntchito.

Katundu: zambiri
1. Kutsika kochepa komanso kudzaza kwakukulu
Ethylene propylene rabara ndi mtundu wa mphira wokhala ndi kachulukidwe kakang'ono ka 0,87. Kuonjezera apo, mafuta ochuluka amatha kudzazidwa ndi zowonjezera zowonjezera, zomwe zingathe kuchepetsa mtengo wa mankhwala a mphira ndikupanga mtengo wapamwamba wa rabara yaiwisi ya rabara ya ethylene propylene. Kuonjezera apo, mphira wa ethylene propylene wokhala ndi mtengo wapamwamba wa Mooney, mphamvu yakuthupi ndi yamakina pambuyo pa kudzazidwa kwakukulu sikudzachepetsedwa kwambiri.

2. Kukana kukalamba
Rabara ya ethylene propylene imakhala ndi kukana kwanyengo, kukana kwa ozoni, kukana kutentha, asidi ndi alkali kukana, kukana kwa nthunzi wamadzi, kukhazikika kwamtundu, magwiridwe antchito amagetsi, kudzaza mafuta ndi kutentha kwachipinda. Ethylene propylene mphira mankhwala angagwiritsidwe ntchito kwa nthawi yaitali pa 120 ℃, ndipo angagwiritsidwe ntchito mwachidule kapena intermittently pa 150 - 200 ℃. Kutentha kogwiritsa ntchito kumatha kukulitsidwa powonjezera antioxidant yoyenera. EPDM yolumikizidwa ndi peroxide ingagwiritsidwe ntchito pamavuto. Pamene mpweya wa ozoni wa EPDM ndi 50 phm ndipo nthawi yotambasula ndi 30%, EPDM ikhoza kufika 150 h popanda kusweka.

3. Kukana dzimbiri
Chifukwa chosowa polarity ndi otsika unsaturation mphira ethylene propylene, ali bwino kukana zosiyanasiyana polar mankhwala monga mowa, asidi, alkali, okosijeni, refrigerant, detergent, nyama ndi masamba mafuta, ketone ndi mafuta; Komabe, ilibe kukhazikika kwamafuta ndi zosungunulira zonunkhiritsa (monga petulo, benzene, etc.) ndi mafuta amchere. Kuchitako kudzatsikanso pansi pakuchita kwanthawi yayitali kwa asidi wokhazikika. Mu ISO/TO 7620, zidziwitso za zotsatira za pafupifupi 400 zowononga mpweya ndi mankhwala amadzimadzi pamtundu wa raba zosiyanasiyana zimasonkhanitsidwa, ndipo magiredi 1-4 amafotokozedwa kuti awonetse zotsatira zake. Zotsatira za mankhwala owononga pamagulu a rubber ndi awa:

Zotsatira za Mlingo wa Kutupa kwa Voliyumu/% Kuchepetsa Kuuma Pazinthu
1<10<10 Pang'ono kapena ayi
2 10-20<20 zochepa
3 30-60<30 Wapakatikati
4> 60> 30 kwambiri

4. Kukana kwa nthunzi wa madzi
EPDM ili ndi mphamvu yabwino kwambiri yolimbana ndi nthunzi ndipo ikuyerekezedwa kuti ndi yoposa kutentha kwake. Mu nthunzi yotentha kwambiri ya 230 ℃, mawonekedwe ake sasintha pakatha pafupifupi maola 100. Komabe, mumikhalidwe yomweyi, mawonekedwe a rabara ya fluorine, labala ya silicon, labala ya fluorosilicone, labala ya butyl, labala ya nitrile ndi mphira wachilengedwe adawonongeka kwambiri pakanthawi kochepa.

5. Kukana madzi otentha kwambiri
Ethylene propylene rabara imakhalanso yabwino kukana madzi otentha kwambiri, koma imagwirizana kwambiri ndi machitidwe onse a vulcanization. The makina katundu wa ethylene propylene rabara (EPR) vulcanized ndi dimorphine disulfide ndi TMTD anasintha pang'ono atamizidwa mu 125 ℃ madzi otentha kwambiri kwa miyezi 15, ndi mlingo kukulitsa voliyumu anali 0.3% yokha.

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

7. Kusangalala
Chifukwa mphira wa ethylene propylene alibe ma polar m'malo ake a mamolekyu ndi mphamvu zochepa zogwirizanitsa maselo, unyolo wake wa molekyulu ukhoza kukhala wosinthasintha mosiyanasiyana, wachiwiri kwa mphira wachilengedwe ndi mphira wa cis polybutadiene, ndipo ukhoza kukhalabe pa kutentha kochepa.

8. Kumamatira
Chifukwa cha kusowa kwa magulu omwe akugwira ntchito mumtundu wa mphira wa ethylene propylene, mphamvu ya mgwirizano imakhala yochepa, ndipo mphira ndi yosavuta kupopera, kotero kudziphatikizana ndi kugwirizanitsa ndizovuta kwambiri.