Fluorinated ethylene propylene los yog FEP yog copolymer ntawm hexafluoropropylene thiab tetrafluoroethylene.Nws txawv ntawm PTFE (polytetrafluoroethylene) resins nyob rau hauv hais tias nws yog yaj-processable siv cov pa txhaj molding thiab ntsia hlau extrusion tswv yim.Fluorinated ethylene propylene tau tsim los ntawm DuPont thiab muag raws li lub npe khoom lag luam polymer FEP.Lwm lub npe yog Neoflon FEP los ntawm Daikin lossis Dyneon FEP los ntawm Dyneon / 3M.
FEP yog qhov zoo sib xws rau cov fluoropolymers PTFE (polytetrafluoroethylene) thiab PFA (perfluoroalkoxy polymer resin).FEP thiab PFA ob leeg qhia PTFE cov khoom muaj txiaj ntsig ntawm kev sib txhuam qis thiab tsis muaj zog, tab sis yooj yim dua formable.FEP yog softer dua PTFE thiab melts ntawm 260 ° C;nws yog pob tshab heev thiab tiv taus tshav ntuj.
FEP yog tsim los ntawm cov dawb radical polymerization ntawm kev sib xyaw ntawm tetrafluoroethylene thiab hexafluoropropylene.Qhov sib tov yog biased los them rau qhov tsis tshua muaj reactivity ntawm propylene tivthaiv.Cov txheej txheem feem ntau pib nrog peroxydisulfate, uas homolyzes los tsim sulfate radicals.Vim tias FEP tsis zoo soluble nyob rau hauv yuav luag tag nrho cov kuab tshuaj, lub polymerization yog ua raws li ib tug emulsion nyob rau hauv dej, feem ntau siv ib tug surfactant xws li PFOS.Lub polymer muaj li ntawm 5% ntawm propylene tivthaiv.
Cov rooj sib piv muaj txiaj ntsig ntawm PTFE tiv thaiv FEP, PFA thiab ETFE tuaj yeem pom ntawm DuPont lub vev xaib, teev cov khoom siv hluav taws xob, thermal, tshuaj lom neeg, hluav taws xob thiab vapor ntawm txhua sab.
Nyob rau hauv cov nqe lus ntawm corrosion kuj, FEP tsuas yog lwm yam fluoropolymer uas muaj peev xwm ua tau raws li PTFE tus kheej tsis kam mus rau caustic agents, vim nws yog ib tug ntshiab carbon-fluorine qauv thiab tag nrho fluorinated.
Thermally, FEP sawv tawm ntawm PTFE thiab PFA los ntawm muaj qhov taw tes melting ntawm 260 ° C (500 ° F), nyob ib ncig ntawm plaub caug degrees qis dua PFA thiab qis dua PTFE dua.
Hluav taws xob, PTFE, FEP thiab PFA muaj cov dielectric zoo ib yam, tab sis FEP lub zog dielectric tsuas yog dhau los ntawm PFA.Txawm li cas los xij, thaum PFA muaj qhov cuam tshuam zoo sib xws rau PTFE, FEP lub dissipation yog nyob ib ncig ntawm rau lub sij hawm ntawm PFA thiab EFTE (ua rau nws tsis yog-linear conductor ntawm electrostatic teb).
Mechanically, FEP yog hloov tau me ntsis dua li PTFE.Tej zaum kuj ceeb tias, nws tsis tuaj yeem rov ua dua folding zoo li PTFE.Nws kuj tseem muaj cov coefficient siab dua ntawm kev sib txhuam dynamic, yog softer thiab muaj zog tensile qis dua PTFE thiab PFA.
Ib qho tseem ceeb ntawm FEP yog tias nws yog qhov zoo tshaj plaws rau PTFE hauv qee daim ntawv thov txheej uas cuam tshuam rau cov tshuaj detergents.
Ethylene tetrafluoroethylene (ETFE), ntau txoj hauv kev, tuaj yeem xav tias yog koom nrog ib pab pawg sib txawv, vim nws yog qhov tseem ceeb ntawm kev ua haujlwm siab zog ntawm lwm tus uas muaj qhov zoo li yuav raug txiav txim siab me ntsis txo qis hauv lwm qhov chaw thaum piv nrog PTFE, FEP thiab PFA.
Post lub sij hawm: Apr-30-2018