Qhov sib txawv tseem ceeb ntawm FEP thiab PTFE yog FEP yog yaj-ua tau siv cov kev txhaj tshuaj molding thiab ntsia hlau extrusion txheej txheem, whereas PTFE tsis yaj-processable.
FEP thiab PTFE yog cov qauv zoo sib xws. Ob yam khoom no muaj cov tshuaj lom neeg uas zoo sib xws. Txawm li cas los xij, lawv muaj ntau yam tshuaj thiab lub cev sib txawv.
FEP yog dab tsi?
Lub sij hawm FEP sawv cev rau fluorinated ethylene propylene copolymer. Nws yog tsim los ntawm hexafluoropropylene thiab tetrafluoroethylene. Lub npe ntawm cov tshuaj no yog Teflon FEP. Txawm li cas los xij, muaj qee qhov lwm lub npe xws li Neoflon FEP, Daikin, thiab Dyneon FEP. Cov khoom no zoo ib yam li PTFE thiab PFA. Peb cov ntaub ntawv no qhia cov khoom ntawm kev sib txhuam qis thiab tsis muaj qhov tsis zoo, tab sis piv rau PTFE, FEP thiab PFA yog yooj yim formable. Ntxiv mus, FEP yog qhov muaj txiaj ntsig zoo dua li PTFE. Tsis tas li ntawd, FEP yog pob tshab heev thiab tseem tiv taus tshav ntuj.
Daim duab 01: Cov qauv tshuaj ntawm Kev Rov Ua Haujlwm ntawm FEP
Feem ntau, cov khoom siv FEP yog tsim los ntawm cov txheej txheem dawb radical polymerization. Cov txheej txheem no siv kev sib xyaw ntawm tetrafluoroethylene thiab hexafluoropropylene. Feem ntau, cov txheej txheem tsim khoom no pib nrog peroxydisulfate, uas tuaj yeem ua homolyze, tsim sulfate radicals. Qhov tseem ceeb tshaj, FEP tsis zoo soluble nyob rau hauv feem ntau ntawm cov kuab tshuaj peb paub; Yog li, cov txheej txheem polymerization yog nqa tawm raws li emulsion hauv dej nyob rau hauv lub xub ntiag ntawm surfactant xws li PFOS.
PTFE yog dab tsi?
Lo lus PTFE sawv rau polytetrafluoroethylene. Hauv cov ntsiab lus, nws yog lub npe hu ua Teflon. Cov khoom no muaj fluorocarbon units raws li rov ua dua units. PTFE yog ib qho hluavtaws fluoropolymer. Cov qauv ntawm cov khoom no yog (C2F4)n.
Daim duab 02: Tus qauv ntawm PTFE
PTFE yog ib yam khoom uas muaj qhov hnyav molecular, tsuas muaj cov pa roj carbon thiab fluorine atoms. Cov khoom no muaj nyob rau hauv lub solid-state ntawm chav tsev kub. PTFE yog hydrophobic yog li, dej tsis tuaj yeem ntub nws qhov chaw. Tsis tas li ntawd, cov khoom no raug suav hais tias yog cov khoom siv tsis zoo thiab muaj txiaj ntsig zoo hauv cov txheej txheem uas tsis yog-stick. Qhov no tsis-reactive xwm tshwm sim vim lub zog ntawm C-F daim ntawv cog lus. Vim yog cov cuab yeej no, PTFE muaj txiaj ntsig zoo hauv kev tsim cov ntim khoom thiab cov kav dej. Tsis tas li ntawd, peb tuaj yeem siv cov khoom no los ua cov roj nplua nyeem thiab. Raws li cov roj nplua nyeem, nws tuaj yeem txo kev sib txhuam thiab kev siv lub zog ntawm cov tshuab. Tsis tas li ntawd, cov khoom no tsis zoo soluble nyob rau hauv yuav luag tag nrho cov kuab tshuaj.
Txoj kev ntawm Teflon ntau lawm yog dawb-radical polymerization. Peb tuaj yeem ua Teflon los ntawm polymerizing tetrafluoroethylene. Txawm li cas los xij, cov txheej txheem tsim khoom no yuav tsum muaj cov cuab yeej tshwj xeeb vim tias tetrafluoroethylene nyiam tawg mus rau hauv tetrafluoromethane. Nws yog ib qho kev phom sij txaus ntshai.
Thaum xav txog nws cov khoom siv polymer, PTFE yog cov thermoplastic polymer. Nws tshwm sim raws li cov khoom dawb ntawm chav tsev kub. Qhov ceev ntawm cov khoom no yog hais txog 2200 kg / m3 Thaum qhov kub thiab txias, Teflon qhia tau hais tias muaj zog thiab tawv heev nrog nws tus kheej lubrication zog. Ntawm qhov kub thiab txias, nws muaj qhov hloov tau zoo thiab. Txij li cov khoom siv no tsis zoo heev, cov tshuaj lom neeg uas tuaj yeem ua rau muaj txiaj ntsig zoo rau nws suav nrog cov tshuaj lom neeg muaj zog xws li alkali hlau.
Dab tsi yog qhov zoo sib xws ntawm FEP thiab PTFE
- FEP thiab PTFE muaj cov tshuaj zoo sib xws.
- Cov tshuaj no muaj cov haujlwm zoo sib xws rau kev tiv thaiv corrosion ntawm cov neeg ua haujlwm caustic.
- Lawv muaj qhov sib npaug dielectric qhov tseem ceeb.
Qhov txawv ntawm FEP thiab PTFE yog dab tsi?
Lub sij hawm FEP sawv cev rau fluorinated ethylene-propylene copolymer thaum lub sij hawm PTFE sawv cev rau polytetrafluoroethylene. Qhov sib txawv tseem ceeb ntawm FEP thiab PTFE yog tias FEP yog yaj-ua tau siv cov txheej txheem txhaj tshuaj molding thiab ntsia hlau extrusion, qhov PTFE tsis yaj-ua tau. FEP muaj cov ntsiab lus siab melting ntau dua li PTEF. Ntxiv mus, PTFE muaj txiaj ntsig zoo hauv kev tsim cov ntim khoom thiab cov kav dej thaum FEP zoo dua rau PTFE hauv qee cov ntawv thov txheej uas cuam tshuam rau cov tshuaj ntxuav tes.
Cov hauv qab no infographic qhia txog qhov sib txawv ntawm FEP thiab PTFE hauv daim ntawv teev npe rau ib sab ntawm kev sib piv.
Summary – FEP vs PTFE
FEP thiab PTFE muaj cov tshuaj zoo sib xws. Qhov sib txawv tseem ceeb ntawm FEP thiab PTFE yog tias FEP yog yaj-ua tau siv cov txheej txheem txhaj tshuaj molding thiab ntsia hlau extrusion, hos PTFE tsis yaj-ua tau.
Image Courtesy:
1. "Fluorinated ethylene propylene" Los ntawm Edgar181 (sib tham) - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia
2. "Perfluorodecyl-chain-from-xtal-Mercury-3D-pob" Los ntawm Ben Mills - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia
