Qhov Tseem Ceeb Qhov txawv - PTFE vs. PFA
PTFE thiab PFA yog cov ntawv luv rau ob qho khoom siv hluavtaws, Polytetrafluoroethylene thiab Perfluoroalkoxy feem. Lawv yog cov fluoropolymers thiab faib cov khoom siv feem ntau. Feem ntau paub thiab dav siv fluoropolymer yog PTFE; tseem hu ua Teflon thiab lub npe ntawm PFA yog Teflon PFA. Qhov sib txawv tseem ceeb ntawm PTFE thiab PFA yog los ntawm cov resins uas siv los ua cov polymer. PFA yog yaj txheej txheem thiab ntau yam tshaj li Teflon; Txawm li cas los xij, PTFE muaj cov khoom zoo heev xws li dej tsawg dua thiab sawv tawm tsam huab cua.
PTFE yog dab tsi?
Lub npe lag luam ntawm PTFE (Polytetrafluoroethylene) yog Teflon; fluoropolymer nrog cov khoom zoo tshaj plaws xws li tshuaj lom neeg ua haujlwm siab, muaj peev xwm qis thiab kub siab, tiv taus huab cua, tsis muaj kev sib txhuam, hluav taws xob thiab thermal rwb thaiv tsev, thiab slipperiness. Txawm li cas los xij, cov khoom siv kho tshuab ntawm PTFE kuj tsawg dua piv rau lwm cov yas; tab sis tseem nyob ruaj khov tshaj qhov kub ntau yam. Cov txheej txheem sib txawv yog siv los tsim PTFE resins los tsim qhov chaw; ram extrusion, ntsia hlau extrusion, compression molding, thiab muab tshuaj txhuam extrusion nrog kev pab extrusion. Peb cov kauj ruam yooj yim yog muaj nyob rau hauv tag nrho cov tswv yim: txias forming, sintering, thiab txias.
PFA yog dab tsi?
PFA (Perfluoroalkoxy) yog cov fluorinated tag nrho, translucent polymer thiab yog kev lag luam nrov li Teflon PFA. Nws yog marginally saj zawg zog cov ntaub ntawv polymer nrog ib tug tsis tshua muaj kev sib txhuam coefficient thiab tshwj xeeb uas tsis yog-stick zog. Ntxiv mus, nws yog ib qho khoom siv muaj zog thiab tawv uas qhia tau hais tias muaj kev tiv thaiv siab rau kev ntxhov siab tawg thiab tsis hnov mob nrog ze li txhua yam tshuaj thiab cov kuab tshuaj. Tsis tas li ntawd, PFA muaj peev xwm tiv taus qhov kub thiab txias thiab tuaj yeem siv tau rau hauv ob qho tib si kub thiab txias. Nws qhov dielectric tas li yog qhov zoo heev thiab tshuaj lom neeg ruaj khov kuj siab heev.
Hauv kev tsim PFA, nws yog yaj thiab ua tiav ntawm qhov kub siab heev; Yog li ntawd nws yog qhov nyuaj heev los pwm PFA resin. Vim qhov tseeb no, nws yog crystalline heev, viscous thiab shear rhiab heev.
Qhov txawv ntawm PTFE thiab PFA yog dab tsi?
qauv:
PTFE: PTFE muaj qhov rov ua dua ntawm -C2F4-, nws tsuas muaj carbon thiab fluorine atoms.
PFA: Chav tsev rov ua dua ntawm PFA polymer yog muab hauv qab no. Tag nrho cov pa roj carbon atoms tau fluorinated tag nrho, thiab ob lub pa roj carbon atom yog sib koom ua ke ntawm cov pa atom (-C-O-C).
Properties:
PTFE: PTFE yog hydrophobic hluavtaws polymer nrog kev sib txhuam coefficient tsawg. Nws muaj cov thermal thiab hluav taws xob rwb thaiv tsev zoo heev. Nws muaj tus nqi siab ceev thiab tsis tuaj yeem ua tiav. Txhawm rau tsim cov duab xav tau, nws yuav tsum tau ntim thiab sinter. Nws cov khoom siv kho tshuab yog sib piv nrog rau lwm cov yas; Txawm li cas los xij cov khoom siv kho tshuab tuaj yeem txhim kho los ntawm kev ntxiv cov fillers.
PFA: PFA yog lub npe hu ua cov khoom siv hloov pauv tau yooj yim nrog cov tshuaj tiv thaiv zoo heev thiab kub ua haujlwm siab. Txawm li cas los xij, nws tsis tshua muaj cua sov dua li PTFA. Nws muaj cov khoom zoo dielectric, thiab qhov dielectric tas li yog sib npaug rau 2.1.
Daim ntawv thov:
PTFE: Teflon yog nrov raws li cov txheej txheem uas tsis yog lo rau hauv cov lauj kaub ua noj thiab lwm yam khoom siv niaj hnub ntawm cookware. Nws kuj yog siv rau hauv cov thawv thiab cov kav dej thaum tuav cov tshuaj corrosive thiab cov tshuaj reactive heev vim nws cov khoom tsis muaj zog. Lwm daim ntawv thov ntawm PTFE yog siv los ua cov roj nplua nyeem los txo kev sib txhuam hauv cov tshuab.
PFA: PFA feem ntau yog siv los tsim cov khoom siv hauv chav kuaj yas vim nws yog optically pob tshab, hloov tau thiab tshuaj tiv thaiv rau ze li ntawm txhua yam tshuaj thiab cov kuab tshuaj. Nws kuj yog feem ntau siv rau tubing hauv kev tuav cov txheej txheem tseem ceeb lossis cov txheej txheem corrosive heev. Tsis tas li ntawd, PFA yog siv los ua cov ntaub ntawv rau cov khoom siv tshuaj, vim tias nws tuaj yeem siv los ua lwm txoj hauv kev rau cov khoom siv kim dua thiab cov hlau xws li carbon steel fiber reinforced plastics (FRPs).
