Uyini umehluko phakathi kwezinto ze-NBR neze-EPDM?

Ezisetshenzisweni zezimboni, ukukhethwa kwezinto kubalulekile ukuqinisekisa ukuqina, ukusebenza kahle, kanye nokusebenza kahle kwezindleko. Izinto ezimbili zerabha zokwenziwa ezisetshenziswa kakhulu yi-nitrile rubber (NBR) kanye ne-ethylene propylene diene monomer (EPDM). Nakuba zombili izinto zinezakhiwo zazo ezihlukile kanye nezinhlelo zokusebenza, ukuqonda umehluko wazo kubalulekile ekukhetheni izinto ezifanele izidingo ezithile.

Izithako nezakhiwo

I-NBR iyi-copolymer eyenziwe nge-acrylonitrile kanye ne-butadiene. Okuqukethwe kwe-acrylonitrile ku-NBR kuvame ukuba phakathi kuka-18% no-50%, okuthinta ukumelana kwayo namafutha kanye nezakhiwo zayo zemishini. I-NBR yaziwa ngokumelana kwayo okuhle kakhulu namafutha, amafutha kanye namanye amakhemikhali, okwenza kube yinto ekhethwayo yezinhlelo zokusebenza zezimoto nezezimboni ezivame ukuxhumana nalezi zinto. I-NBR inamandla amahle okudonseka, ukumelana nokuklwebheka kanye nokuguquguquka, okubaluleke kakhulu ezivalweni, ama-gasket kanye namapayipi.

Ngakolunye uhlangothi, i-EPDM iyi-terpolymer eyenziwe nge-ethylene, i-propylene, kanye nengxenye ye-diene. Lokhu kuhlanganiswa okuyingqayizivele kunikeza i-EPDM ukumelana nesimo sezulu okuhle kakhulu, ukuzinza kwe-UV, kanye nokumelana ne-ozone. I-EPDM ifaneleka kakhulu ekusetshenzisweni kwangaphandle njengokwakheka kophahla, ukususwa kwesimo sezulu sezimoto, kanye nezivalo ezidinga ukumelana nezimo zemvelo ezinzima. Ngaphezu kwalokho, i-EPDM ihlala iguquguquka emazingeni okushisa aphansi, okwenza kube ukukhetha okuhle kokusetshenziswa kwesimo sezulu esibandayo.

Ukumelana nokushisa

Ukumelana nokushisa okuphezulu kungomunye umehluko obalulekile phakathi kwe-NBR ne-EPDM. I-NBR ngokuvamile isebenza kahle ebangeni lokushisa eliphakathi kuka--40°C kuya ku-100°C (-40°F kuya ku-212°F), kuye ngokuthi iklanywe kanjani. Kodwa-ke, ukuchayeka isikhathi eside emazingeni okushisa aphezulu kungabangela ukuwohloka. Ngokuphambene nalokho, i-EPDM ingamelana nokushisa okubanzi, kusukela ku--50°C kuya ku-150°C (-58°F kuya ku-302°F), okwenza kube ukukhetha okuhle kwezicelo ezidinga ukuguquguquka okuphezulu ezimweni ezimbi kakhulu.

Ukumelana namakhemikhali

Ngokuphathelene nokumelana namakhemikhali, i-NBR isebenza kahle ezindaweni eziqukethe uwoyela namafutha. Ngenxa yekhono layo lokumelana nemikhiqizo esuselwe kuphethiloli, i-NBR ivame ukusetshenziswa embonini yezimoto kumapayipi kaphethiloli, ama-O-rings, kanye nama-seal. Kodwa-ke, i-NBR ayimelani kahle nezinyibilikisi ze-polar, ama-acid, noma izisekelo, okungabangela ukuthi ivuvuke noma yonakale.

Ngakolunye uhlangothi, i-EPDM imelana kakhulu namanzi, umusi, kanye nohlu olubanzi lwamakhemikhali, okuhlanganisa ama-acid kanye nezisekelo. Lokhu kuyenza ifaneleke kakhulu embonini yokucubungula amakhemikhali kanye nezicelo zangaphandle lapho ivame ukuchayeka khona kumswakama. Kodwa-ke, i-EPDM ayifanele ukusetshenziswa namafutha kanye namafutha, njengoba ivuvukala futhi ilahlekelwa yizimfanelo zayo zemishini.

isicelo

Ukusetshenziswa kwe-NBR kanye ne-EPDM kukhombisa izakhiwo zayo ezihlukile. I-NBR isetshenziswa kabanzi ezinhlelweni zikaphethiloli, ama-gasket kanye nezivalo emkhakheni wezimoto, kanye nezicelo zezimboni ezifana nezivalo zikaphethiloli kanye namapayipi. Ukumelana kwayo nophethiloli kwenza kube yinto ebaluleke kakhulu ezindaweni ezivezwe emikhiqizweni kaphethiloli.

Ngokuphambene nalokho, i-EPDM ifaneleka kangcono ezinhlelweni zokusebenza ezidinga ukumelana nesimo sezulu, njengophahla, izivalo zamafasitela, kanye nokususwa kwesimo sezulu sezimoto. Ukumelana kwayo ne-UV ne-ozone kuyenza ifanele ukusetshenziswa ngaphandle, okuqinisekisa ukuthi ihlala isikhathi eside futhi isebenza kahle ngisho nasezimweni ezinzima.

Ngamafuphi, ukukhethwa kwezinto ze-NBR kanye ne-EPDM kuncike ezidingweni ezithile zokusetshenziswa. I-NBR iyinto ekhethwayo yokumelana nowoyela kanye nophethiloli, kuyilapho i-EPDM ihamba phambili ezinhlelweni ezidinga ukumelana nesimo sezulu kanye ne-ozone. Ukuqonda umehluko ekwakhiweni, izakhiwo, ukumelana nokushisa okuphezulu, ukumelana namakhemikhali, kanye nezinhlelo zokusebenza kuzosiza abakhiqizi nonjiniyela ukuthi benze izinqumo ezinolwazi lapho bekhetha izinto ezifanele ukuhlangabezana nezidingo zabo.

I-Kingflex inemikhiqizo yokuvikela i-NBR kanye ne-EPDM. Uma unemibuzo, sicela ukhululeke ukuthumela umbuzo eqenjini le-Kingflex nganoma yisiphi isikhathi.