Uyini umehluko phakathi kwezinto ze-NBR ne-EPDM?

Ekusetshenzisweni kwezimboni, ukukhethwa kwezinto kubalulekile ukuze kuqinisekiswe ukuqina, ukusebenza, kanye nokusebenza kahle kwezindleko. Izinto ezimbili ezisetshenziswa kakhulu zenjoloba yokwenziwa yirabha ye-nitrile (NBR) ne-ethylene propylene diene monomer (EPDM). Yize zombili izinto ezisetshenziswayo zinezakhiwo ezihlukile nezindlela ezisetshenziswayo, ukuqonda ukuhlukana kwazo kubalulekile ekukhetheni into efanelekile yezidingo ezithile.

Izithako kanye nezakhiwo

I-NBR iyi-copolymer eyenziwe nge-acrylonitrile ne-butadiene. Okuqukethwe kwe-acrylonitrile ku-NBR ngokuvamile kuphakathi kuka-18% no-50%, okuthinta ukumelana kwawo nowoyela kanye nezakhiwo zemishini. I-NBR yaziwa ngokumelana kwayo okuhle kakhulu nowoyela, amafutha kanye namanye amakhemikhali, okuyenza ibe yinto ekhethwayo ezisetshenziswa zezimoto nezezimboni ezivame ukuhlangana nalezi zinto. I-NBR iphinde ibe namandla amahle okuqina, ukumelana nokuhuzuka kanye nokuguquguquka, okubalulekile kuma-seal, ama-gaskets namapayipi.

I-EPDM, ngakolunye uhlangothi, i-terpolymer eyenziwe nge-ethylene, i-propylene, nengxenye ye-diene. Lokhu kwakheka okuyingqayizivele kunikeza i-EPDM ukumelana nesimo sezulu esihle kakhulu, ukuzinza kwe-UV, nokumelana ne-ozone. I-EPDM ifaneleka ngokukhethekile izinhlelo zokusebenza zangaphandle ezifana nolwelwesi olunophahla, i-automotive weatherstripping, nama-seal adinga ukumelana nezimo zemvelo ezinzima. Ngaphezu kwalokho, i-EPDM ihlala iguquguquka emazingeni okushisa aphansi, okwenza kube ukukhetha okuhle kwezicelo zesimo sezulu esibandayo.

Ukumelana nokushisa

Ukumelana nezinga lokushisa eliphezulu ngomunye umehluko obalulekile phakathi kwe-NBR ne-EPDM. I-NBR ngokuvamile yenza kahle ebangeni lokushisa elingu--40°C kuya ku-100°C (-40°F kuya ku-212°F), kuye ngokwakhiwa okuthile. Nokho, ukuchayeka isikhathi eside emazingeni okushisa aphezulu kungabangela ukuwohloka. Ngokuphambene, i-EPDM ingakwazi ukumelana nezinga lokushisa elibanzi, kusukela ku--50°C kuya ku-150°C (-58°F kuya ku-302°F), okwenza kube ukukhetha okuhle kwezinhlelo zokusebenza ezidinga ukunwebeka okuphezulu ezimeni ezimbi kakhulu.

Ukumelana namakhemikhali

Mayelana nokumelana namakhemikhali, i-NBR isebenza kahle ezindaweni eziqukethe uwoyela namafutha. Ngenxa yekhono layo lokumelana nemikhiqizo esekelwe ku-petroleum, i-NBR ivamise ukusetshenziswa embonini yezimoto kumapayipi kaphethiloli, ama-O-rings, nama-seal. Kodwa-ke, i-NBR inokumelana okungalungile nezincibilikisi ze-polar, ama-asidi, noma izisekelo, ezingase ziyibangele ukuthi ikhukhumale noma iwonakele.

I-EPDM, ngakolunye uhlangothi, imelana ngokwedlulele namanzi, isitimu, nezinhlobonhlobo zamakhemikhali, okuhlanganisa ama-asidi nezisekelo. Lokhu kwenza kube kuhle embonini yokucubungula amakhemikhali kanye nezinhlelo zokusebenza zangaphandle lapho kuvame ukuvezwa khona kumswakama. Kodwa-ke, i-EPDM ayifanele ukusetshenziswa ngamafutha namafutha, njengoba ikhukhuma futhi ilahlekelwa izici zayo zemishini.

isicelo

Ukusetshenziswa kwe-NBR ne-EPDM kukhombisa izakhiwo zayo ezihlukile. I-NBR isetshenziswa kabanzi ezinhlelweni zikaphethiloli, ama-gaskets kanye nezimpawu emkhakheni wezimoto, kanye nezicelo zezimboni ezifana nezimpawu zikawoyela namapayipi. Ukumelana kwawo nowoyela kuwenza ube yisidingo esibalulekile ezindaweni ezivezwe emikhiqizweni ye-petroleum.

Ngokuphambene, i-EPDM ifaneleka kangcono izinhlelo zokusebenza ezidinga ukumelana nesimo sezulu, njengokufulela, izigxivizo zamawindi, nokucwecwa kwesimo sezulu sezimoto. Ukumelana kwayo ne-UV ne-ozone kuyenza ilungele ukusetshenziswa ngaphandle, iqinisekise ukuphila kwayo isikhathi eside nokusebenza kwayo ngisho nasezimeni ezinzima.

Kafushane, ukukhetha kwezinto ze-NBR ne-EPDM kuncike ezidingweni ezithile zohlelo lokusebenza. I-NBR iyimpahla ekhethwayo yokumelana nowoyela nophethiloli, kuyilapho i-EPDM ihamba phambili ezinhlelweni ezidinga ukumelana nesimo sezulu kanye ne-ozone. Ukuqonda umehluko ekwakhekeni, izakhiwo, ukumelana nezinga lokushisa eliphezulu, ukumelana namakhemikhali, kanye nezinhlelo zokusebenza kuzosiza abakhiqizi nonjiniyela benze izinqumo ezinolwazi lapho bekhetha izinto ezifanele ukuhlangabezana nezidingo zabo.

I-Kingflex inayo yomibili imikhiqizo yokufakelwa kwe-NBR kanye ne-EPDM.Uma unombuzo, sicela ukhululeke ukuthumela imibuzo ethimbeni le-Kingflex nganoma yisiphi isikhathi.