Teflon txau cov txheej txheem tshwj xeeb yog cov tshuaj fluorine raws li polytetrafluoroethylene (ob qho tib si transliterated los ntawm Teflon), thiab Teflon sprays tshwj xeeb coatings yog fluorine coatings raws li polytetrafluoroethylene (ob leeg transliterated los ntawm Teflon). PTFE tshuaj tsuag txheej yog ib hom kev ua tau zoo txheej txheej sib xyaw ua ke thaum tshav kub kub, tshuaj inertia, zoo rwb thaiv tsev ruaj khov thiab tsis tshua muaj kev sib txhuam, thiab muaj cov txiaj ntsig zoo uas lwm cov txheej txheem tsis tuaj yeem sib xws.
Qhov yooj yim ntawm nws daim ntawv thov tso cai rau nws siv yuav luag tag nrho cov duab thiab ntau thiab tsawg. PTFE txau tuaj yeem muab faib ua ntau hom: TFE, FEP, PFA thiab ETFE.
Teflon spray PTFE: PTFE (polytetrafluoroethylene) non-stick txheej tuaj yeem siv tsis tu ncua ntawm 260 degree, nrog tsis tshua muaj kev sib txhuam coefficient, zoo hnav tsis kam, thiab tshuaj lom neeg ruaj khov ntawm 290 degree.
Teflon spray FEP: FEP (fluorinated ethylene propylene copolymer) non-stick txheej melt flow thaum lub sij hawm ci los ua ib zaj duab xis ntxeem tau, nrog cov tshuaj zoo stability thiab zoo heev uas tsis yog-stick zog, kev siv kub yog 200 degree.
Teflon spray PFA: PFA non-stick txheej, zoo li FEP, tsim cov zaj duab xis ntxeem tau thaum lub sij hawm ci, thiab nws qhov zoo yog kev siv kub tsis tu ncua, siv kub ntawm 260 degree, muaj zog hardness thiab toughness, tshwj xeeb tshaj yog haum rau high-temperature anti- adhesion thiab tshuaj tiv thaiv daim ntawv thov.
Teflon Spray ETFE: ETFE yog ib qho ethylene-tetrafluoroethylene copolymer. Cov resin yog ib qho tawv fluoropolymer uas tsim cov txheej txheem uas muaj tshuaj tiv thaiv thiab ua haujlwm tsis tu ncua ntawm 150 degree.
Teflon txau:
Ua ntej, cov txheej txheem dispersion txheej txheem
Dispersion txheej yog ua tiav los ntawm qhov sib npaug ntawm cov khoom siv txheej txheej hauv cov kuab tshuaj los ua cov kua dispersed (cov khoom sib xyaw hauv cov kua). Qhov sib tov no yog atomized los ntawm huab cua siab thiab txau rau ntawm qhov chaw ntawm lub workpiece.
II. (1) Kev npaj ntawm workpieces
Yuav kom tau txais qhov chaw txaus adhesion ntawm qhov chaw ntawm lub workpiece, tag nrho cov roj yuav tsum xub muab tshem tawm ntawm qhov chaw kom coated. Peb yaj cov roj nrog cov kuab tshuaj organic thiab cua sov rau li 400 degree kom nws tag nrho volatilize. Nyob rau hauv cov kauj ruam tom ntej, lub workpiece yog ntxuav thiab nto yog ntxhib sandblasted. Kev siv cov nplaum nplaum (primers) tuaj yeem txhim kho lub peev xwm ntawm txheej rau adhesion rau saum npoo ntawm workpiece.
Hmoov txheej
Cov hmoov hmoov yog cua tshuab tawm ntawm lub collector los ntawm compressed cua, thiab ntawm txoj kev mus rau lub nozzle ntawm cov tshuaj tsuag, muaj ib tug electrostatic cheeb tsam. Txij li thaum cov khoom nqa tib lub nqi hluav taws xob, lawv tawm tsam ib leeg ntawm lawv txoj kev ya davhlau, ua rau huab cua tsis sib xws. Lub workpiece yuav tsum tau pleev xim rau hauv av los tsim ib qho chaw electrostatic ntawm rab phom thiab lub workpiece. Cov hmoov hmoov yog attracted rau lub workpiece thiab txuas mus rau lub workpiece.
Hmoov melting
Hauv cov txheej txheem txheej txheem, muaj qhov sib txawv ntawm qhov ntsuas kub thiab txias txias. Yog tias siv cov tshuaj tsuag kub kub, qhov kub ntawm lub substrate yog siab tshaj qhov kub ntawm cov khoom siv hmoov, thiab cov hmoov nplej yog npog rau ntawm nws. Ua li no, cov hmoov yog yaj thaum lub sij hawm txau.
(2) Kev npaj ntawm workpieces
Txhawm rau kom ua tiav qhov adhesion txaus ntawm qhov chaw ntawm lub workpiece, tag nrho cov roj ntawm qhov chaw yuav tsum tau coated ua ntej yuav tsum tau muab tshem tawm. Peb siv cov kuab tshuaj organic kom yaj cov roj thiab ua kom sov li ntawm 400 degree kom nws volatilized kiag li. Nyob rau hauv cov kauj ruam tom ntej, lub workpiece yog mechanically ntxuav thiab ntxhib nrog sandblasting. Lub adhesion ntawm txheej rau saum npoo ntawm lub workpiece tuaj yeem txhim kho los ntawm kev siv cov khoom sib txuas ntxiv (primer).
