Mu ntchito zamafakitale, kusankha zinthu ndikofunikira kwambiri kuti zitsimikizire kulimba, magwiridwe antchito, komanso kugwiritsa ntchito bwino ndalama. Zipangizo ziwiri za rabara zopangidwa zomwe zimagwiritsidwa ntchito kwambiri ndi nitrile rabara (NBR) ndi ethylene propylene diene monomer (EPDM). Ngakhale kuti zipangizo zonsezi zili ndi makhalidwe akeake komanso ntchito zake, kumvetsetsa kusiyana kwake ndikofunikira kuti musankhe zinthu zoyenera zosowa zinazake.
Zosakaniza ndi katundu
NBR ndi copolymer yopangidwa kuchokera ku acrylonitrile ndi butadiene. Kuchuluka kwa acrylonitrile mu NBR nthawi zambiri kumakhala pakati pa 18% ndi 50%, zomwe zimakhudza kukana kwake mafuta ndi mphamvu zake zamakanika. NBR imadziwika chifukwa cha kukana kwake bwino mafuta, mafuta ndi mankhwala ena, zomwe zimapangitsa kuti ikhale chinthu chosankhidwa kwambiri pamagalimoto ndi mafakitale omwe nthawi zambiri amakumana ndi zinthuzi. NBR ilinso ndi mphamvu yabwino yogwira, kukana kukwawa komanso kusinthasintha, zomwe ndizofunikira kwambiri pa zisindikizo, ma gasket ndi mapayipi.
Koma EPDM ndi terpolymer yopangidwa kuchokera ku ethylene, propylene, ndi diene. Kapangidwe kake kapadera kameneka kamapatsa EPDM kukana bwino nyengo, kukhazikika kwa UV, komanso kukana ozone. EPDM ndi yoyenera kwambiri pa ntchito zakunja monga denga, kutseka magalimoto, ndi zisindikizo zomwe zimafunika kupirira nyengo yovuta. Kuphatikiza apo, EPDM imakhala yosinthasintha kutentha kochepa, zomwe zimapangitsa kuti ikhale chisankho chabwino kwambiri pa ntchito yozizira.
Kukana kutentha
Kukana kutentha kwambiri ndi kusiyana kwina kwakukulu pakati pa NBR ndi EPDM. NBR nthawi zambiri imagwira ntchito bwino kutentha kwa -40°C mpaka 100°C (-40°F mpaka 212°F), kutengera mtundu wake. Komabe, kuwonetsedwa nthawi yayitali kutentha kwambiri kungayambitse kuwonongeka. Mosiyana ndi zimenezi, EPDM imatha kupirira kutentha kwakukulu, kuyambira -50°C mpaka 150°C (-58°F mpaka 302°F), zomwe zimapangitsa kuti ikhale chisankho chabwino kwambiri pakugwiritsa ntchito komwe kumafuna kusinthasintha kwakukulu m'mikhalidwe yovuta kwambiri.
Kukana mankhwala
Ponena za kukana mankhwala, NBR imagwira ntchito bwino m'malo okhala ndi mafuta ndi mafuta. Chifukwa cha kuthekera kwake kupirira zinthu zopangidwa ndi mafuta, NBR nthawi zambiri imagwiritsidwa ntchito m'makampani opanga magalimoto popanga mapayipi amafuta, ma O-rings, ndi ma seal. Komabe, NBR ili ndi kukana kochepa ku zinthu zosungunulira za polar, ma acid, kapena maziko, zomwe zingayambitse kutupa kapena kuwonongeka.
Koma EPDM imalimbana kwambiri ndi madzi, nthunzi, ndi mankhwala osiyanasiyana, kuphatikizapo ma acid ndi ma base. Izi zimapangitsa kuti ikhale yoyenera kwambiri pamakampani opanga mankhwala komanso panja komwe nthawi zambiri imakhala ndi chinyezi. Komabe, EPDM si yoyenera kugwiritsidwa ntchito ndi mafuta ndi mafuta, chifukwa imatupa ndikutaya mphamvu zake zamagetsi.
ntchito
Kugwiritsa ntchito NBR ndi EPDM kukuwonetsa mawonekedwe ake apadera. NBR imagwiritsidwa ntchito kwambiri mumakina amafuta, ma gasket ndi ma seal m'magawo a magalimoto, komanso ntchito zamafakitale monga ma seal amafuta ndi ma hose. Kukana kwake mafuta kumapangitsa kuti ikhale yofunikira kwambiri m'malo omwe ali ndi zinthu zamafuta.
Mosiyana ndi zimenezi, EPDM ndi yoyenera kwambiri pa ntchito zomwe zimafuna kupirira nyengo, monga denga, zotsekera mawindo, ndi kuchotsa nyengo m'magalimoto. Kukana kwake ku UV ndi ozone kumapangitsa kuti ikhale yabwino kwambiri panja, zomwe zimapangitsa kuti ikhale yayitali komanso yogwira ntchito ngakhale m'malo ovuta.
Mwachidule, kusankha zipangizo za NBR ndi EPDM kumadalira zosowa zenizeni za ntchito. NBR ndi chinthu chomwe chimasankhidwa kuti chikhale cholimba pa mafuta ndi mafuta, pomwe EPDM imachita bwino kwambiri pa ntchito zomwe zimafuna kulimba kwa nyengo ndi ozoni. Kumvetsetsa kusiyana kwa kapangidwe kake, makhalidwe ake, kulimba kwa kutentha kwambiri, kulimba kwa mankhwala, ndi ntchito zake kudzathandiza opanga ndi mainjiniya kupanga zisankho zodziwa bwino posankha zipangizo zoyenera kukwaniritsa zosowa zawo.
Kingflex ili ndi zinthu zotetezera kutentha za NBR ndi EPDM. Ngati muli ndi funso lililonse, chonde musazengereze kutumiza mafunso ku gulu la Kingflex nthawi iliyonse.
Nthawi yotumizira: Meyi-15-2025
