Fluorinated ethylene propylene VS PTFE

I-ethylene propylene ene-Fluorinated okanye i-FEP yi-copolymer ye-hexafluoropropylene kunye ne-tetrafluoroethylene.Iyahluka kwi-PTFE (i-polytetrafluoroethylene) i-resins kuba iyanyibilika-iqhubekeke kusetyenziswa isitofu esiqhelekileyo sokubumba kunye nobuchule be-screw extrusion.I-ethylene propylene eFluorinated yaqanjwa yiDuPont kwaye ithengiswa phantsi kwegama lebrand yepolymer FEP.Amanye amagama eebrendi yiNeoflon FEP esuka kwaDaikin okanye iDyneon FEP esuka kwiDyneon/3M.

I-FEP ifana kakhulu ekubunjweni kwe-fluoropolymers PTFE (polytetrafluoroethylene) kunye ne-PFA (perfluoroalkoxy polymer resin).I-FEP kunye ne-PFA zombini zabelana ngeepropathi eziluncedo ze-PTFE zokukhuhlana okuphantsi kunye nokungaphinde kusebenze, kodwa zenzeke ngokulula ngakumbi.I-FEP ithambile kune-PTFE kwaye iyanyibilika kwi-260 °C;icace kakhulu kwaye iyamelana nokukhanya kwelanga.

I-FEP iveliswa yi-polymerization yamahhala yemixube ye-tetrafluoroethylene kunye ne-hexafluoropropylene.Umxube uthambekele ekuhlawuleni ukuphinda kusebenze okuphantsi kwecandelo lepropylene.Inkqubo ngokuqhelekileyo iqalwa nge-peroxydisulfate, ethi i-homolyzes ivelise i-sulfate radicals.Ngenxa yokuba i-FEP inganyibiliki kakuhle phantse kuzo zonke izinyibilikisi, i-polymerization yenziwa njenge-emulsion emanzini, ihlala isebenzisa i-surfactant efana ne-PFOS.I-polymer iqulethe malunga ne-5% yecandelo lepropylene.

Iitheyibhile eziluncedo zothelekiso lwe-PTFE ngokuchasene ne-FEP, PFA kunye ne-ETFE zinokufunyanwa kwiwebhusayithi yeDuPont, idwelisa iipropathi zoomatshini, ezishushu, zekhemikhali, zombane kunye nomphunga zecala ngalinye.

Ngokubhekiselele ekuxhathiseni umhlwa, i-FEP kuphela kwenye i-fluoropolymer efumaneka ngokulula enokuthi ifanise ukuchasana kwe-PTFE kwi-caustic agents, njengoko iyisakhiwo esicocekileyo se-carbon-fluorine kwaye i-fluorinated ngokupheleleyo.

Ngokwe-Thermally, i-FEP igqamile kwi-PTFE kunye ne-PFA ngokuba nendawo yokunyibilika ye-260 °C (500 °F), malunga namashumi amane edigri ngaphantsi kwe-PFA kwaye ihle kwakhona kune-PTFE.

Ngombane, i-PTFE, i-FEP kunye ne-PFA zinee-dielectric constants ezifanayo, kodwa amandla edielectric e-FEP agqithwa kuphela yi-PFA.Nangona kunjalo, ngelixa i-PFA inomlinganiselo ofanayo wokulahla kwi-PTFE, ukuchithwa kwe-FEP kujikeleze ngokuphindwe kathandathu kune-PFA kunye ne-EFTE (iyenza ibe yi-conductor engaphezulu engeyo-linear yemimandla ye-electrostatic).

Ngoomatshini, i-FEP ibhetyebhetye kancinci kune-PTFE.Mhlawumbi ngokumangalisayo, ayimelani nokuphinda-phinda ukusonga kunye ne-PTFE.Ikwabonisa i-coefficient ephezulu yokukhuhlana okuguquguqukayo, ithambile kwaye inamandla asezantsi kancinci kune-PTFE kunye ne-PFA.

Ipropathi eqaphelekayo ye-FEP kukuba yongame kakhulu kune-PTFE kwezinye izicelo zokugquma ezibandakanya ukuvezwa kwizicoci.

I-Ethylene tetrafluoroethylene (ETFE), ngeendlela ezininzi, inokucingelwa njengeyeqela elahlukileyo, njengoko iluguqulelo lobunjineli obunamandla obunye obunokuthathwa njengeepropati ezincitshiswe kancinci kwezinye iindawo xa zithelekiswa nazo. I-PTFE, i-FEP kunye ne-PFA.