Tom qab cua sov cov tshuaj polymer, lub PTFE immersion rhaub feem ntau tshwm sim coated nyob rau hauv ib tug dub, brittle crust ntawm carbonized organic residue. Txoj kev xav yog muab nti tawm, tab sis qhov muag PTFE nto yuav raug puas tsuaj. Ib txoj hauv kev tshuaj lom neeg yog tib txoj kev nyab xeeb los kho qhov huv, dawb, tsis yog - nplaum nplaum. Phau ntawv no piav qhia yuav ua li castshem tawm carbonized deposit PTFE rhaub sheathsiv cov kuab tshuaj thiab cov kua qaub me me tsis ua rau muaj kev puas tsuaj rau txhua yam.
Vim li cas Mechanical Cleaning Fail
PTFE sheath yog qhov muag muag piv rau cov hlau lossis cov ntaub ntawv ceramic. Txhua yam khoom siv txhuam los yog ntse - hlau ntaub plaub, ntawv xuab zeb, txhuam hlau, chisels, lossis hlau scrapers - yuav khawb qhov tob tob. Cov khawb no tsim cov chaw nucleation uas yav tom ntej deposits txuas ntxiv aggressively. Thaum cov khoom uas tsis yog - nplaum raug cuam tshuam, fouling nrawm dua, thiab lub tshuab rhaub yuav nyuaj dua los ntxuav. Cov txheej txheem siv tshuab kuj tseem pheej hmoo txiav rau hauv PTFE, nthuav tawm cov xov hlau sab hauv kom ya raws lossis cov kua dej corrosive. Yog li ntawd, kev tu txhua yam raug txwv nruj rau PTFE-cov cua kub cua sov.
Nkag siab txog Carbonized Deposit
Cov dub, nkig crust feem ntau yog oxidized, cross-txuas polymer uas tau pyrolyzed ntawm qhov kub thiab txias. Cov khoom siv no khi xoob rau ntawm PTFE nto los ntawm lub cev adhesion es tsis yog tshuaj sib txuas. Vim tias PTFE muaj lub zog qis heev, feem ntau carbonized deposits tsis tsim ib daim ntawv cog lus mus tas li. Txawm li cas los xij, cov crust tuaj yeem nyuaj thiab ua raws, yuav tsum muaj tshuaj softening ua ntej tshem tawm.
Kauj Ruam -los ntawm - Cov Txheej Txheem Kev Siv Tshuaj Txhuam
Kauj Ruam 1: Txheeb xyuas qhov Original Polymer lossis Organic Compound
Cov kuab tshuaj zoo tshaj plaws rau softening carbonized deposit yog tib cov kuab tshuaj uas dissolves tus thawj uncarbonized polymer. Piv txwv li:
Polyurethane residues tuaj yeem muag hauv N-methyl-2-pyrrolidone (NMP) lossis dimethyl sulfoxide (DMSO).
Epoxy-raws li crusts teb rau dichloromethane los yog muaj epoxy strippers.
General organic fouling los ntawm cov roj los yog roj yuav raug tshem tawm nrog xylene kub los yog terpenes.
Yog tias qhov tso nyiaj muaj cov ntxhia pob zeb (piv txwv li, calcium carbonate los ntawm cov dej tawv sib xyaw nrog cov organic), cov kua qaub me me (citric lossis acetic acid) pab rhuav tshem cov ntawv cog lus.
Kauj Ruam 2: Txheeb xyuas qhov sib xyaw ua ke nrog PTFE
Ua ntej yuav siv cov kuab tshuaj, nws qhov kev sib raug zoo nrog PTFE yuav tsum tau kuaj xyuas siv cov tshuaj tiv thaiv kab mob. PTFE yog inert rau yuav luag tag nrho cov kuab tshuaj nyob rau hauv kub hauv qab no 200 degree, nrog tsawg heev zam (xws li, molten alkali hlau, fluorine gas). Txawm li cas los xij, qee cov kuab tshuaj - tshwj xeeb tshaj yog cov kuab tshuaj chlorinated xws li dichloromethane lossis perchlorethylene - tuaj yeem nkag los ntawm PTFE dhau sijhawm. Qhov no tsis yaj lossis o PTFE, tab sis cov kuab tshuaj tuaj yeem txav mus rau thaj chaw xaim sab hauv. Yog li ntawd, kev sib raug zoo feem ntau tau txais, tab sis tom qab - ntxuav kom qhuav yog qhov tseem ceeb.
Kauj Ruam 3: Siv Cov Khoom Kub Kub rau qhov ua tau zoo tshaj plaws
Cov carbonized crust softens sai dua thaum cov kuab tshuaj yog rhuab. Txoj kev hauv qab no raug pom zoo:
Tshem lub rhaub los ntawm lub tankthiab cia nws txias rau qhov ntsuas kub zoo (hauv qab 50 degree).
Ncuav cov kuab tshuaj kub ncaj qha rau ntawm lub hnablos yog tsau ib tug huv, lint -dawb ntaub nyob rau hauv lub kub hnyav thiab qhwv nws nyob ib ncig ntawm lub crusted cheeb tsam.
Khaws kev sib cuag rau 15-60 feeb, nyob ntawm qhov tuab ntawm qhov tso nyiaj. Rau tuab, ci - ntawm cov khaubncaws sab nraud povtseg, lub rhaub yuav muab tso rau hauv ib lub thawv me me ntawm cov kuab tshuaj kub.
Npog lub thawvtxhawm rau txo cov kuab tshuaj evaporation thiab hluav taws kub (yog tias siv cov kuab tshuaj flammable - xyuas kom muaj cua txaus thiab tsis muaj qhov hluav taws kub).
Kauj Ruam 4: Maj mam so qhov Softened Deposit
Thaum lub crust softened mus rau paste -zoo li sib xws, nws tuaj yeem raug tshem tawm yam tsis muaj kev quab yuam:
Siv antaub mos(paj rwb los yog microfiber) los so qhov chaw. Thov tsuas yog lub teeb siab.
Rau cov tawv nqaij tawv, ayas scraper(polypropylene lossis PTFE) tuaj yeem siv tau. Yas yuav tsis khawb PTFE sheath.
Yaug cov ntaub qhwv nrog dej huv los yog ib qho tshuaj yaug cov kuab tshuaj kom tshem tawm cov kuab tshuaj seem thiab cov khoom xoob.
Kauj Ruam 5: Alternative Acid Soak rau Mixed Deposits
Yog tias cov txheej carbonized sib txuas nrog cov ntxhia pob zeb (ntau zaus thaum cua sov cov ntsiab lus hauv cov dej nyuaj), cov kua qaub txias txias yuav ua tau zoo dua li cov kuab tshuaj organic. Ib qho 5-10% citric acid tov ntawm 60-70℃yog kev nyab xeeb rau PTFE thiab dissolves calcium -raws li nplai. Lub tshuab cua sov yog muab tso rau hauv dej kub acid rau 30 feeb, tom qab ntawd maj mam so nrog ib daim ntaub mos. Tom qab cov kua qaub ntub dej, cov dej yaug thiab cov kuab tshuaj so tseem tseem xav tau los tshem tawm cov organic tivthaiv.
Kauj Ruam 6: Tshaj tawm -Tsev kom qhuav thiab ci
PTFE yog permeable rau qee cov kuab tshuaj, tshwj xeeb yog me me -cov tshuaj chlorinated thiab cov tshuaj tsw qab. Tom qab ntxuav, lub hau yuav muaj cov kuab tshuaj absorbed uas tuaj yeem tawm tau thaum lub sijhawm ua haujlwm tom ntej. Yog li ntawd, lub rhaub yuav tsum yog:
Tshaj tawmrau 12–24 teev nyob rau hauv lub qhov dej - qhov cua qhov chaw, los yog
CiHauv qhov cub huv ntawm 80-100℃rau 2-4 teev kom tshem tawm cov kuab tshuaj absorbed.
Tsis txhob siab tshaj 110℃thaum lub sij hawm ci, vim PTFE pib degrade saum nws qhov kev pabcuam kub kub. Tom qab ci, lub rhaub yuav tsum tau saib xyuas kom pom cov khoom seem. Qhov saum npoo yuav tsum rov qab mus rau matte dawb los yog tawm -zoo li dawb.
Yuav Ua Li Cas Kom Zam Tsis Taus
| Txoj Kev Tsis Txaus Siab | Qhov tshwm sim |
|---|---|
| Hlau wool los yog abrasive pads | Kev khawb mus tas li, poob ntawm cov khoom tsis yog- nplaum |
| Hlau scrapers, riam, los yog chisels | Grooves uas ntxiab deposits, tau sheath puncture |
| Sandblasting los yog abrasive pastes | Ua tiav kev puas tsuaj ntawm PTFE nto kev ncaj ncees |
| Concentrated nitric acid (tshaj 30%) | Tshuaj tua kab mob ntawm PTFE ntawm qhov kub siab |
| Qhib nplaim taws los yog taws cua sov | Melting thiab decomposition ntawm PTFE |
Kev Tiv Thaiv: Qhov Kev Kho Mob Zoo Tshaj Plaws rau Carbonized Deposits
Cov tshuaj qeeb qeeb ua haujlwm xav tsis thoob qhov twg brute quab yuam ua tsis tiav, tab sis lub tswv yim zoo tshaj plaws yog los tiv thaiv carbonization los ntawm qhov tshwm sim thawj zaug. Carbonized organic deposits tsim thaum cov kua nyob ze ntawm lub rhaub sheath overheats hauv zos vim tsis zoo cua sov hloov. Cov kev ntsuas hauv qab no txo qhov kev pheej hmoo:
Tswj kom txaus tank agitation(mechanical stirring los yog recirculation) kom tawg cov ciam teb ruaj khov.
Ua haujlwm nyob rau hauv qhov pom zoo watt ceevrau cov kua. Roj thiab viscous polymers xav tau qis watt ntom dua li dej.
Siv lub tshuab hluav taws xob qis dua -watt-nrog rau lub sheath ntev dua kom kis tau tib lub zog hla ib cheeb tsam loj.
Txhim kho qhov kub thiab txias nrog tshaj - tiv thaiv kubteem rau hauv qab lub thermal decomposition point ntawm cov organic compound.
Xaus
Kev tshem tawm kev nyab xeeb ntawm carbonized organic deposits los ntawm PTFE rhaub sheath cia siab rau chemistry, tsis puas. Cov kuab tshuaj kub uas phim cov khoom qub polymer, thov ua siab ntev, softens lub brittle crust kom nws yuav tsum tau wiped nrog ib tug mos ntaub los yog ib tug yas scraper. Rau cov khoom sib xyaw uas muaj cov nplais pob zeb, cov kua qaub me me ntxiv ua ntej lossis tom qab cov kauj ruam hnyav. Cov txheej txheem siv tshuab - hlau scrapers, steel wool, los yog abrasives - yuav tsum tsis txhob siv, raws li lawv mus tas li ua rau PTFE nto thiab rhuav tshem nws cov khoom tsis yog - stick. Tom qab ntxuav, lub rhaub yuav tsum tau ci los yog aired kom tshem tawm cov kuab tshuaj permeated. Thaum kawg, qhov kev kho zoo tshaj plaws yog kev tiv thaiv: tswj kom zoo tank agitation thiab kom zoo watt ceev txo qhov kub qhov chaw uas carbonization pib. Nrog rau kev siv tshuaj lom neeg, acarbonized deposit PTFE rhaub sheathtuaj yeem rov qab tau zoo thiab kev lag luam.
