PFA vs PTFE

PFA, los yog Perfluoroalkoxy, yog ib hom fluoropolymer.Nws muaj cov khoom zoo sib xws li ntau hom polytetrafluoroethylene (PTFE), uas yog cov npe nrov tshaj plaws ntawm polymer.PFA tau xeeb los ntawm DuPont Co. thiab muab lub npe hom polymer PFA.Dab tsi txawv nws los ntawm cov resins ntawm PTFE yog tias PFA yog yaj txheej txheem.Qhov no yog ua tiav los ntawm cov pa txhaj tshuaj molding nrog rau cov txheej txheem ntsia hlau extrusion.

Polytetrafluoroethylene (PTFE), kuj yog hluavtaws fluoropolymer ntawm tetrafluoroethylene.DuPont Co. yog tus tsim khoom zoo tshaj plaws ntawm PTFE, uas, raws li tau hais ua ntej, yog cov khoom siv feem ntau cov neeg paub tias yog polymer.Lub tsev los ntawm qhov kev tshawb pom tsis zoo ntawm Roy Plunkett, PTFE yog cov khoom hnyav molecular uas muaj cov pa roj carbon thiab fluorine.Qhov tseem ceeb, nws yog cov khoom fluorocarbon.Nws yog hydrophobic, lub ntsiab lus dej los yog cov khoom uas muaj dej tuaj yeem ua rau nws ntub vim fluorocarbon tus yam ntxwv ntawm kev txo qis hauv London dispersion rog.Yog li, PTFE muaj cov coefficient tsawg heev ntawm kev sib txhuam thaum sib cuag nrog cov khib nyiab.Qhov no yog vim lub siab electronegativity ntawm fluorine.Lwm yam tshaj li polymer, PTFE kuj tseem hu ua Fluon thiab Syncolon.

olytetrafluoroethylene (PTFE) yog ib qho hluavtaws fluoropolymer ntawm tetrafluoroethylene uas muaj ntau daim ntawv thov.

Perfluoroalkoxy alkanes (PFA) yog ib tug copolymer ntawm hexafluoropropylene thiab perfluoroethers.Ib qho kev paub PFA formulation yog polymer PFA.

PFA muaj cov khoom zoo sib xws rau PTFE, txawm tias qhov sib txawv loj tshaj ntawm PTFE thiab PFA yog tias PFA yog yaj-ua tiav.Qhov no yog ua tiav los ntawm cov pa txhaj tshuaj molding nrog rau cov txheej txheem ntsia hlau extrusion.

PTFE feem ntau yog siv los ua cov txheej tsis lo rau cov lauj kaub thiab ntau yam khoom siv niaj hnub.PTFE feem ntau yog siv rau hauv cov thawv thiab cov kav dej los tuav cov tshuaj reactive thiab corrosive.Qhov no yog vim hais tias nws muaj cov khoom tsis-reactive.Lwm qhov kev siv tau ntawm PTFE yog cov roj nplua nyeem.Siv rau hauv txoj kev no, PTFE pab txo kev sib txhuam hauv cov tshuab, txo qhov "hnav thiab tsim kua muag," thiab txhim kho kev siv zog.

PFA feem ntau yog siv rau cov khoom siv hauv cov khoom siv yas vim nws qhov kev tiv thaiv tsis zoo rau tshuaj tua kab mob, qhov pom kev pom tseeb, thiab kev hloov pauv tag nrho.PFA kuj tseem siv tau los ua tubing rau kev tuav cov txheej txheem tseem ceeb lossis muaj kev cuam tshuam loj heev.Lwm daim ntawv thov rau PFA yog cov ntaub ntawv rau cov khoom siv tshuaj.Vim nws cov khoom, nws tuaj yeem pab txhawb kev siv cov carbon steel fiber reinforced plastics (FRPs) los hloov cov hlau thiab hlau kim dua.

Cov cuab yeej siv rau kev ntsuas qib feem ntau raug rau qhov hnyav tank cua.Cov xov xwm txhoj puab heev, xws li kua qaub, tuaj yeem corrode probes thiab qhov chaw hauv kev sib cuag nrog cov khoom.Cov khoom nplaum thiab nplaum yog lwm yam kev sib tw ntsuas.Cov no tuaj yeem ua rau muaj kev tsim tawm ntawm qhov chaw ntub dej ntawm lub tshuab xa hluav taws xob thiab ua rau muaj kev pheej hmoo cuam tshuam rau kev ntsuas.Wetted qhov chaw coated nyob rau hauv PTFE los yog PFA cov ntaub ntawv muab ib tug zoo tiv thaiv rau cov khoom corrosive thiab yog ib qho kev daws teeb meem kom tsis txhob muaj kab mob los ntawm cov khoom tsim.

Cov khoom siv dej tuaj yeem ua rau muaj qhov sib txawv ntawm cov kav hlau txais xov, uas tuaj yeem cuam tshuam rau qib ntsuas.Vim tias cov khoom siv hydrophobic ntawm PTFE thiab PFA, qhov kev ntsuas yuav nyob twj ywm tsis muaj kev cuam tshuam nyob rau hauv cov ntaub ntawv tee dej ntawm cov kav hlau txais xov.

PTFE, ua cov khoom fluorocarbon, yog hydrophobic, txhais tau tias nws tsis yooj yim wetted los ntawm cov khoom uas muaj dej.Tsis tas li ntawd, PTFE muaj cov coefficient tsawg heev ntawm kev sib txhuam thaum sib cuag nrog cov khib nyiab.

PFA yog superior rau PTFE nyob rau hauv cov nqe lus ntawm kev yooj yim tshwj xeeb tshaj yog thaum nws los txog rau tubing daim ntaub ntawv.Ntawm qhov tod tes, PFA lub neej flex (piv txwv li, muaj peev xwm ua kom rov ua dua folding) qis dua PTFE.

PTFE yog me ntsis resistant rau tshav kub tshaj PFA.PFA cuam tshuam ntau dua los ntawm kev nqus dej thiab huab cua tab sis zoo dua rau PTFE thaum nws los txog rau ntsev tsuag tshuaj tiv thaiv.

PFA muaj tib lub dielectric tas li raws li PTFE nrog rau qhov zoo sib xws dissipation yam;tseem PFA muaj lub zog dielectric peb mus rau plaub zaug siab dua PTFE.