# Ua li cas siab -kub tshuaj tua kab mob ua kom cov txheej txheem fluoroplastic PFA? PFA coated heaters yog dav siv nyob rau hauv qis -corrosion fermentation ntau lawm kab, qhov twg cov fluoroplastic txheej ua hauj lwm raws li ib qho kev cais barrier ntawm corrosive nruab nrab thiab carbon steel substrate. Rov qab siab -kub tshuaj tua kab mob thiab CIP cycles ua txhaum cov qauv ntawm cov saw hlau ruaj khov ntawm PFA cov ntaub ntawv, ua rau yellowing, blistering thiab adhesion degradation. Yog tsis muaj kev soj ntsuam xyuas, txheej txheej aging yuav ua rau substrate xeb to thiab nruab nrab paug. Cov lus hauv qab no qhia txog cov txheej txheem kev laus hauv qab qhov sib txawv siab - qhov kub thiab txias zaus.|Txhua Hnub Siab-Cycles Kub|Txheej Molecular State|Deg Kev laus tshwm sim|Lub Sijhawm Ua Haujlwm Tseem Ceeb Tseem Ceeb|Optimized tswj ntsuas|| ----|----|--{{51}-|----|----|| 1 lub voj voog, kub tsawg dua lossis sib npaug rau 85 degree|Ua kom ruaj khov fluorocarbon chains|Ntxim qab tsis muaj xim|16–18 lub hlis|Khaws tus qauv 40-feeb tom qab tu kom txias txias|| 2 cycles, kub 85–90 degree|Ib nrab saw micro-pob txha|Faint yellowing ntawm khoov cua sov seem|10–12 lub hlis|Shorten kub alkali soaking lub sij hawm los ntawm 10 feeb|| 3 cycles, kub tshaj 90 degree|Loj saw tawg, sab hauv kev ntxhov siab tsub zuj zuj|Cov hlwv me me tawg, pom tseeb daj stains|4–6 lub hlis|Txo cov tshuaj tua kab mob los yog ntxiv cov kauj ruam txias nruab nrab|| Tshaj 3 lub voj voog nrog kev kub ceev nruam|Hla-txuas txuas tsis ua haujlwm, txheej delamination|Loj-chaw bulging, ib nrab tev tawm substrate|Tsawg dua 2 lub hlis|Teem ceev tag nrho lub rhaub hloov|Kev tiv thaiv corrosion ntawm PFA tso siab rau kev sib txuas nrog cov roj carbon-fluorine molecular chains, uas muaj kev ruaj ntseg zoo nyob rau hauv ib txwm ua haujlwm kub hauv qab 80 degree. Thaum cov cuab yeej nkag mus rau qhov kub-kub tua kab mob siab tshaj 85 degree, thermal expansion generates nruam tensile stress nyob rau hauv lub txheej. Txhua qhov cua sov-txias lub voj voog ua rau lub micro-pob txha ntawm fluorocarbon chains, tsis muaj zog ntawm cov qauv tiv thaiv ib kauj ruam. Lub luj tshib thiab cua sov seem dais qhov kub ntawm qhov sib txawv loj tshaj plaws, ua thawj qhov chaw laus pom ntawm qhov muag liab qab. Lub sij hawm ntev kub kuj tseem txhim kho qhov kev nkag mus ntawm alkaline detergent. Cov qhov khoob me me uas tsim los ntawm cov saw hlau molecular tawg cia hydroxide ions nkag mus ntawm txheej txheej thiab steel substrate. Cov kua alkali sib xyaw ua ke yuav ua rau lub siab sab hauv thiab tsim cov hlwv, uas tsis tuaj yeem rov qab tau txawm tias tom qab txias. Thaum cov hlwv rupture thaum lub sij hawm nruab nrab ncig, cov carbon steel puag ncaj qha hu rau fermentation broth, ua hlau ion impurities uas tsis GMP sterility tshuaj xyuas. Ntau lub rooj cob qhia txiav lub sijhawm tsim khoom los ntawm kev tshem tawm qhov yuav tsum tau ua kom txias qeeb tom qab cov tshuaj tua kab mob siab, uas ua rau cov txheej txheej laus zuj zus thiab ua rau lub neej ua haujlwm ntawm PFA cov cua sov. Ntxiv nrog rau qhov pom kev laus, cov txheej txheem txheej tuab thiab kev kuaj adhesion tuaj yeem ntsuas qhov kev pheej hmoo ntawm kev laus. Cov kws kho mob yuav tsum ua raws li kev ntsuas ob lub hlis; Yog tias cov thickness hauv zos poob qis dua 0.5 hli, txheej txheej tiv thaiv kev laus muaj peev xwm poob qis heev. Rau cov kab ntau lawm nrog cov tshuaj tua kab mob ntau zaus, kho cov txheej txheem tsis zoo kom txo qis qhov kub thiab txias tag nrho lub sijhawm txias tom qab txhua lub voj voog. Pem hauv ntej-kawg particle lim kuj xav tau kev hloov raws sij hawm kom tsis txhob muaj cov khoom tawv tawv khawb qhov uas twb muaj hnub nyoog txheej txheej. Cov tuam txhab lag luam yuav tsum tsim kom muaj cov txheej txheem tiv thaiv kev laus ua tiav ua ke nrog kev soj ntsuam txhua hnub thiab kev ntsuas raws sijhawm. Kev ua kom zoo raws sij hawm ntawm cov txheej txheem tshuaj tua kab mob kub tuaj yeem ua rau qeeb fluoroplastic molecular saw puas, ncua tag nrho cov txheej txheem tsis ua haujlwm, txo cov nqi hloov cov cua sov ntau zaus thiab tsis txhob cia li poob los ntawm kev laus ntawm PFA txheej.
