Iminyaka engaphezu kwamashumi ayisithupha iPolytetrafluoroethylene (PTFE, amagama emikhiqizo: Tarflen, polymer, Fluon) yaziwa futhi yaziwa ngezakhiwo zayo ezihlukile.Isetshenziswa kabanzi kuwo wonke amagatsha embonini, kufaka phakathi ukukhiqizwa kwe-flexibleamapayipiyokwakhiwa nokusetshenziswa okuhlukahlukene.
Izakhiwo eziyingqayizivele ze-PTFE:
- Excellent chemical ukumelana.Ayincibiliki noma ivuvuke kunoma yiziphi izincibilikisi ezaziwayo.Imelana nama-asidi nezisekelo ezinolaka kakhulu.Zimbalwa kakhulu, izinto ezingavamile kakhulu (i-fluorine, izinsimbi ze-alkali ezibilayo, i-oxygen bifluoride, i-chlorine trifluoride) ezingathinta i-PTFE.- Ububanzi obubanzi bokumelana nokushisa.I-PTFE ihlala iguquguquka ngisho nakumazinga okushisa e-helium ewuketshezi (-269°C).Iphuzu elincibilikayo le-crystalline le-PTFE lingu-+327°C, futhi ku-+415°C ukubola kwe-PTFE kwenzeka.Izinga lokushisa elisebenzayo lamapayipi enziwe nge-PTFE ngokuvamile lisukela ku--70°C liye ku-+260°C kuye ngomklamo wepayipi (ingcindezi nemingcele yemishini ye-PTFE iqala ukwehla lapho izinga lokushisa likhuphuka ngaphezu kuka +130°C).- Ukumelana nokuguga. nezimo zezulu.I-PTFE iyi-hydrophobic, imelana ngokuphelele ne-ozone, umoya-mpilo, ukukhanya kanye nemisebe ye-UV.Amasampula adalulwe iminyaka eminingana ezimweni zezulu ezahlukahlukene awazange abonise noma yiziphi izinguquko ezakhiweni ze-PTFE.- I-PTFE ine-coefficient ephansi kakhulu yokungqubuzana (kusuka ku-0.02 kuya ku-0.2) kanye nenani eliphansi lamandla angaphezulu.Ngakho-ke amapayipi enziwe nge-PTFE anezakhiwo zokuzihlanza (izinto azinamathele ezindongeni ze-hose) ngakho-ke ukudluliselwa kuhlanzekile kakhulu.- Izakhiwo zikagesi ezinhle, ukumelana okuphezulu.
Ezinye izinto ezifana ne-PTFE
Amapayipi angenziwa kuphela kusuka ku-PTFE kodwa futhi naku-PTFE copolymers.Imvamisa ifaka ukumelana okuphezulu kwamakhemikhali nokushisa kodwa ezinye izakhiwo zihluke kancane uma ziqhathaniswa ne-PTFE (ukumelana okungcono komshini, izimfanelo ezingcono zokucubungula):
- FEP (polymer FEP, DuPont),- PFA, MFA (polymer PFA, DuPont),- ETFE (Tefzel, DuPont),- ECTFE (Halar).
Ukukhiqizwa nokwakhiwa kwamapayipi e-PTFE
Ngenxa ye-viscosity ephezulu ngisho namazinga okushisa aseduze nokubola okushisayo (+415°C),Amapayipi we-PTFEakhiqizwa ngokukhipha inhlanganisela ye-lubricant (amafutha kapharafini) kanye ne-PTFE powder.
Izinhlobo zokwakhiwa kwepayipi le-PTFE:
- Amapayipi abushelelezi nakathayela angenawo umluko.Isetshenziselwa izicelo ezinengcindezi ephansi.I-Translucent, udonga lwe-PTFE luvumela ukulawula okubonakalayo kokugeleza.- Amapayipi abushelelezi anomluko wangaphandle owodwa noma okabili owenziwe ngensimbi engagqwali.Isetshenziswa kabanzi cishe kuyo yonke imidiya: amakhemikhali, amagesi, umusi, uwoyela, izinto zokuthambisa, uphethiloli, upende, izinto zokunamathisela, ukudla kuwo wonke amagatsha emboni.Inhlanganisela yokucindezela okuphakeme kokusebenza kwamapayipi (afinyelela kumabha angama-400) kanye nezakhiwo eziyingqayizivele ze-PTFE kuholela kusixazululo sendawo yonke nesingabuyiseleki sobuchwepheshe bamuva bezimboni.- Amapayipi kathayela anemiluko yangaphandle eyenziwe ngensimbi engagqwali noma izinto ezihlukile.Kwesinye isikhathi iqiniswa nge-helix yocingo lwensimbi phakathi kwe-PTFE nomluko wangaphandle.Kwenziwe ngezinketho ezihlukahlukene zokwakha ngokucindezela okuphansi kokusebenza kodwa ukuguquguquka okuphezulu kunamapayipi abushelelezi.- Amapayipi abushelelezi ane-PTFE liner extruded ene-textile braid, insimbi yokuqiniswa kwe-helix yensimbi kanye nongqimba lwangaphandle olwenziwe ngerabha.Zonke izendlalelo zenziwe sengozini futhi zihlanganiswe unomphela nesendlalelo sangaphakathi se-PTFE – njengakwipayipi lerabha elijwayelekile.Isetshenziswa kakhulu embonini yamakhemikhali.
Isikhathi sokuthumela: Jun-02-2018