Fluorinated ethylene propylene VS PTFE

I-ethylene propylene ene-fluorinated noma i-FEP iyi-copolymer ye-hexafluoropropylene ne-tetrafluoroethylene.Ihlukile kuma-PTFE (polytetrafluoroethylene) resins ngoba iyancibilika kusetshenziswa izindlela ezijwayelekile zokubumba umjovo kanye namasu okukhipha isikulufu.I-ethylene propylene ene-Fluorinated yasungulwa yi-DuPont futhi ithengiswa ngaphansi kwegama lomkhiqizo we-polymer FEP.Amanye amagama omkhiqizo yi-Neoflon FEP evela ku-Daikin noma i-Dyneon FEP evela ku-Dyneon/3M.

I-FEP ifana kakhulu ekubunjweni kwama-fluoropolymers PTFE (polytetrafluoroethylene) kanye ne-PFA (perfluoroalkoxy polymer resin).I-FEP kanye ne-PFA zombili zabelana ngezici eziwusizo ze-PTFE zokungqubuzana okuphansi nokunganyakazi kabusha, kodwa zakheka kalula.I-FEP ithambile kune-PTFE futhi incibilika ku-260 °C;isobala kakhulu futhi imelana nokukhanya kwelanga.

I-FEP ikhiqizwa yi-free-radical polymerization yezingxube ze-tetrafluoroethylene ne-hexafluoropropylene.Ingxube ichemile ukuze kunxeshezelwe ukusebenza kabusha okuphansi ngokuqhathaniswa kwengxenye ye-propylene.Inqubo ngokuvamile iqalwa nge-peroxydisulfate, eyenza i-homolyzes ikhiqize ama-sulfate radicals.Ngenxa yokuthi i-FEP ayincibiliki kahle cishe kuzo zonke izincibilikisi, i-polymerization yenziwa njenge-emulsion emanzini, ngokuvamile isebenzisa i-surfactant efana ne-PFOS.I-polymer iqukethe cishe i-5% yengxenye ye-propylene.

Amathebula okuqhathanisa awusizo e-PTFE ngokumelene ne-FEP, PFA kanye ne-ETFE angatholakala kuwebhusayithi ye-DuPont, ebala izici zemishini, ezishisayo, zamakhemikhali, zikagesi kanye nomhwamuko ngakunye, ngokuhambisana.

Mayelana nokumelana nokugqwala, i-FEP iyona kuphela enye i-fluoropolymer etholakala kalula engafanelana ne-PTFE ukumelana nama-caustic agents, njengoba iyisakhiwo esihlanzekile se-carbon-fluorine futhi esigcwele fluorinated ngokugcwele.

Ngokushisa, i-FEP igqama ku-PTFE kanye ne-PFA ngokuba nephuzu lokuncibilika elingu-260 °C (500 °F), cishe amadigri angamashumi amane aphansi kune-PFA futhi yehle futhi kune-PTFE.

Ngogesi, i-PTFE, i-FEP ne-PFA inama-dielectric constants afanayo, kodwa amandla e-dielectric e-FEP edlula kuphela i-PFA.Kodwa-ke, ngenkathi i-PFA inesici sokuqothula esifanayo ne-PTFE, ukuhlakazeka kwe-FEP cishe kuphindwe izikhathi eziyisithupha kune-PFA ne-EFTE (okwenze kube umqhubi ongenamugqa owengeziwe wezinkambu ze-electrostatic).

Ngokwemishini, i-FEP ivumelana nezimo kancane kune-PTFE.Mhlawumbe ngokumangalisayo, ayimelani nokugoqa okuphindaphindiwe kanye ne-PTFE.Iphinde ibe ne-coefficient ephezulu yokungqubuzana okuguquguqukayo, ithambile futhi inamandla aqinile aphansi kune-PTFE ne-PFA.

Impahla ephawulekayo ye-FEP ukuthi iphakeme kakhulu kune-PTFE kwezinye izinhlelo zokusebenza zokuhlanganisa ezibandakanya ukuchayeka ezihlahleni.

I-Ethylene tetrafluoroethylene (ETFE), ngezindlela eziningi, ingacatshangwa njengengxenye yeqembu elihlukile, njengoba empeleni inguqulo yobunjiniyela yamandla aphezulu yamanye aqukethe lokho okungenzeka kubhekwe njengezakhiwo ezinciphile kancane kwezinye izinkambu uma ziqhathaniswa I-PTFE, FEP kanye ne-PFA.