Polytetrafluoroethylene (PTFE) raw khoom siv yog ib qho kev sib khi txoj siv tam sim no. Qhov tseeb, muaj ntau yam kev faib tawm. Tam sim no, zoo tib yam PTFE txoj siv tawv dawb yog siv hauv HVAC thiab cov khoom siv dej thiab cov kav dej, thiab kuj tseem muaj cov hlua tshwj xeeb PTFE rau cov raj xa dej. Qhov tseeb, cov ntaub ntawv tseem ceeb yog PTFE, tab sis qee cov txheej txheem sib txawv.
Polytetrafluoroethylene yog ib qho polymer ntawm tetrafluoroethylene. Kev tawg ntawm carbon carbon bond thiab carbon fluorine daim ntawv cog lus nyob rau hauv perfluorocarbon yuav tsum tau 346.94 kJ / mol thiab 484.88 kJ / mol ntawm lub zog feem, tab sis tsuas yog 171.38 kJ ntawm lub zog yog xav tau rau lub depolymerization ntawm polytetrafluoroethylene los tsim 1mol ntawm tetrafluoroethylene. Yog li ntawd, thaum lub sij hawm pyrolysis ntawm qhov kub thiab txias, polytetrafluoroethylene mas depolymerized rau hauv tetrafluoroethylene.
Qhov hnyav poob (feem pua) ntawm PTFE ntawm 260, 370 thiab 420 degree yog 1 ib teev raws li × 10-4,4 × 10-3 thiab 9 × 10-2. Nws tuaj yeem pom tias PTFE tuaj yeem siv tau ntev ntawm 260 degree. Vim yog cov tshuaj lom neeg lom zem heev los ntawm cov khoom fluorophosgene thiab perfluoroisobutylene tsim thaum lub sij hawm kub kub tawg, tshwj xeeb yuav tsum tau them nyiaj rau kev tiv thaiv kev nyab xeeb thiab tiv thaiv polytetrafluoroethylene los ntawm kev tiv thaiv hluav taws.
Cov chaw tsim khoom siv raw khoom yuav tsum ua txoj haujlwm zoo hauv kev tiv thaiv hluav taws, ua kom muaj kev nyab xeeb hauv kev tsim khoom, tiv thaiv kev tiv thaiv thiab tsis txhob muaj kev kub ntxhov.
