Lub Nto Zog ntawm PTFE Ua Li Cas Ua Rau Nws Tsis yog -Stick thiab Anti- Fouling Properties?

Lub PTFE tso rau hauv lub rhaub dej tshem tawm los ntawm fouling- da dej yooj yim feem ntau yuav plam nws cov deposits los ntawm kev yaug yooj yim, tab sis lub rhaub hlau yuav tsum tau khawb los yog kua qaub ntxuav. Cov khoom tsis yog - nplaum yog los ntawm cov khoom siv hluav taws xob ntawm PTFE. Qhov kev sib raug zoo ntawm lub zog saum npoo thiab fouling tsis kam yog tsim tau zoo thiab pab piav qhia vim li cas PTFE tseem yog cov khoom ntawm kev xaiv hauv cov xwm txheej ua rau muaj teeb meem loj heev.

Surface Energy yog dab tsi? Kev piav qhia Plain
Lub zog saum npoo yog ib qho kev ntsuas ntawm qhov zoo ntawm qhov chaw nyiam lwm cov ntaub ntawv xws li kua, khib nyiab lossis ib nrab- cov khoom ntim khoom. Cov hlau huv huv lossis iav yog qhov chaw muaj zog thiab muaj kev nyiam heev. Cov kua dej sib cuag nrog lub siab - lub zog saum npoo yuav kis tau (ntub qhov chaw) thiab ua raws li zoo heev. Nyob rau hauv sib piv, qhov tsawg zog nto tsim ib tug tsis muaj zog txaus nyiam. Cov kua dej zoo li cov hlaws lossis cov tee dej, tsis sib kis, thiab cov khib nyiab muaj teeb meem ua rau cov nplaum nplaum muaj zog.

PTFE muaj lub zog qis heev. Qhov tseem ceeb ntawm qhov nro ntawm PTFE yog nyob ib ncig ntawm 18-20 dynes ib centimeter. (Qhov ntau npaum no feem ntau sau ua millinewtons ib 'meter' lossis mN / m). Nyob rau hauv kev sib piv, qhov nro ntawm cov dej ntawm ambient kub yog nyob ib ncig ntawm 72 dynes / cm2. PTFE tsis ntub dej. Qhov nro ntawm cov dej yog qhov ntau dua li lub zog saum npoo ntawm PTFE. Cov dej tsim cov hlaws dai uas yob tawm yooj yim. Tib txoj hauv kev yog siv rau ntau yam kua, slurries thiab semi-solid deposits ntsib nyob rau hauv industrial cua sov.

Yuav Ua Li Cas Molecular Structure ntawm PTFE Tsim Tsawg Nto Zog
Lub zog nto qis yog vim cov qauv molecular ntawm PTFE. PTFE yog tsim los ntawm cov molecules uas ntev chains ntawm carbon atoms, txhua carbon atom muaj ob fluorine atoms txuas. Fluorine atoms yog electronegative heev, thiab lawv tsim ib qho ze - ntim txheej txheej txheej ntawm cov pob txha carbon. Qhov no fluorinated nto muaj zog intermolecular tsis muaj zog heev (van der Waals rog) nyob rau hauv kev sib raug zoo nrog lwm yam tshuaj. Yeej, muaj tsawg heev uas tuaj yeem "lo" rau PTFE nto txaus los ua kom muaj kev sib raug zoo mus tas li.

Nws yuav tsum tau muab sau tseg tias qhov zoo no yog qhov tseem ceeb rau cov khoom siv thiab tsis lwj nrog lub sijhawm. Qhov no txawv ntawm qee cov txheej txheem uas tsis yog-stick txheej uas hnav tawm los yog yuav tsum tau rov qab siv dua thaum lub sijhawm. PTFE 's tsis tshua muaj zog nto yog ib qho feature. Lub PTFE uas tau tshwm sim tshiab muaj tib yam tsis muaj zog saum npoo txawm tias qhov chaw puas los yog abraded.

Lub zog qis npaum li cas txhais tau tias tsis yog -stick thiab anti-fouling zog
Kev sib raug zoo nrog PTFE nto zog tsis yog fouling kuj yog linear thiab kwv yees. Vim tias PTFE muaj lub zog qis dua li cov foulants feem ntau, cov nplaum nplaum tsis tuaj yeem tsim tau. Lub zog saum npoo muaj nyob rau cov pob zeb hauv av (calcium carbonate, calcium sulphate), hlau sludge (nickel, tooj liab, zinc hais los ntawm plating da dej), polymerised residues thiab organic deposits. Thaum lawv sim tso rau ntawm PTFE nto, lub zog interfacial tsis zoo rau adhesion. Cov kev tso nyiaj yuav tsis ua raws, lossis ua raws li qhov tsis zoo uas lawv raug tshem tawm los ntawm cov kua dej tsis tu ncua lossis ib qho tshuaj ntxuav kom huv.

Hauv kev muaj tiag, tus cwj pwm no muab ntau cov txiaj ntsig ntsuas tau:

Txo scaling - Cov nplai dej tawv muaj feem ntau yuav tawg thiab tawg tawm ntawm PTFE lub rhaub dua li tsim rau hauv cov txheej txheem insulating.

Tsawg hlau sludge adhesion - PTFE cov cua sov yog raug rau cov hlau tsis tshua muaj hlau tso rau hauv electroplating thiab hlau tiav tso tsheb hlau luam dua stainless hlau lossis titanium rhaub.

Ib qho yooj yim los ntxuav - Yog tias muaj daim ntawv tso nyiaj, cov dej tsis tshua muaj dej yaug lossis hla nrog txhuam maj mam yog txhua yam uas xav tau. Tsis tshua muaj qhov hnyav txhua yam txhuam los yog cov tshuaj ntxuav kom muaj zog uas tsim nyog.

Tsawg fouling yam tseem ceeb PTFE cov cua sov ua kom muaj kev ua haujlwm tas li hauv kev hloov hluav taws xob hloov pauv txhua lub sijhawm vim tias qhov ua rau fouling (thermal kuj ntxiv los ntawm kev tso nyiaj) nyob qis.

Nto Zog ntawm PTFE Piv rau Lwm Cov Khoom
Txoj hauj lwm ntawm PTFE nrog rau cov khoom siv hauv lub tshuab cua sov thiab lwm qhov chaw siv tau pom hauv cov lus hauv qab no. Lub zog ntawm lub zog qis dua=zoo dua tsis yog -stick zog

Cov Khoom Siv Tseem Ceeb Ntog Zog (dyne/cm lossis mN/m) Cov txheeb ze Tsis yog-Kev Ua Haujlwm Zoo
PTFE (polytetrafluoroethylene) 18 - 20 Zoo heev (tsawg nplaum)
Perfluoroalkoxy alkane (PFA )18 - 20 Piv rau PTFE
Fluorinated Ethylene Propylene (FEP) 18 - 19 Zoo li PTFE
Silicone roj hmab 22-24 Zoo tab sis tsis ua rau cov tshuaj
Polypropylene (PP) 29 – 31 Nruab nrab tsis yog -stick
Stainless hlau (huv, passivated) 70 - 110 Phem; ntau deposits cling tightly
Iav 70 - 100Tsis zoo; scale thiab organics lo yooj yim
Dej (nto nro, sib piv) 72 (Tsis yog khoom, tab sis qhia tau hais tias yog vim li cas dej hlaws dai)
Ib qho ntawm qhov zoo ntawm PTFE vs lwm cov khoom siv hluav taws xob tsawg tsawg xws li polypropylene yog nws cov tshuaj inertness. Polypropylene tej zaum yuav tsis yog -stick, tab sis nws tsis sawv mus rau qhov kub thiab txias los yog hnyav acids thiab cov kuab tshuaj uas PTFE ua. PFA thiab FEP yog ob qho tib si fluoropolymers zoo ib yam li PTFE nrog lub zog zoo sib xws. Lawv feem ntau ua hauj lwm raws li lwm txoj hauv kev rau PTFE qhov uas yuav tsum tau ua kom pom tseeb lossis txawv cov yam ntxwv.

Cov txiaj ntsig zoo rau kev kho cua sov thiab hloov cov cua sov
Qhov no tsis yog -stick feature ntawm PTFE ncaj qha cuam tshuam rau ob yam tseem ceeb ntawm kev khiav hauj lwm: txij nkawm ncua sij hawm thiab kev ua haujlwm kub hloov pauv.

Kev tu ntau zaus - Ib lub da dej npib tsib xee plating tej zaum yuav xav tau lub tshuab cua sov stainless hlau kom rub tawm thiab cov kua qaub dipped txhua lub lim tiam kom tshem tawm cov tsim- ntawm cov hlau sludge. Lub PTFE rhaub hauv ib da dej zoo sib xws tuaj yeem khiav tau rau lub hlis nrog tsuas yog yaug txhua hli thiab txawm tias tom qab ntawd cov khoom tso tawm tev tawm yooj yim. Qhov kev txo qis hauv kev saib xyuas downtime txhais mus rau kev tsim khoom ntau dua.

Thaum tshav kub kub kis tau tus mob efficiency - Deposits nyob rau saum npoo ntawm lub rhaub ua raws li thermal insulators. Raws li cov deposits los yog sludge accumulates nyob rau hauv ib tug hlau rhaub, watt ceev ntawm lub deposit nto nce (vim tib lub hwj chim yog muab nyob rau hauv ib tug me me qhov chaw zoo), uas ua rau lub zos overheating thiab ntxiv deposit hardening. PTFE tsis yog - nplaum nto cuam tshuam qhov no tus kheej - txhawb nqa lub voj voog fouling. Lub tshuab cua sov khaws nws cov qauv tsim hluav taws xob hloov pauv rau lub sijhawm ntev dua.

Nco ntsoov tias PTFE nws tus kheej muaj qhov ntsuas kub me me (txog 0.25 W / m·K) raws li tau hais hauv ntu dhau los. Qhov no xav kom ceev faj watt ntom ntom tsim tsis tau cov yam ntxwv tiv thaiv - fouling pab kom them nyiaj rau thermal tiv thaiv los ntawm kev ua kom lub ntsej muag sab nrauv kom huv si. Txawm hais tias muaj qhov ua tau zoo dua qub ntawm cov hlau, qhov huv PTFE nto xa cov cua sov zoo dua li cov hlau tsis zoo.

Kev txwv thiab kev txiav txim siab
Tsis muaj ib yam dab tsi uas tsis yog - stick nyob rau hauv txhua yam. Cov deposits tsis tu ncua, xws li ci - ntawm carbonised residues los yog ib co coated polymer coatings, tuaj yeem lo rau PTFE. Tsis tas li ntawd, yog tias PTFE nto yog lub cev puas lawm (sib sib zog nqus khawb los yog gouges), cov deposits muaj peev xwm mus mechanically interlock nrog rau qhov chaw puas thiab yog li txo qhov kev ua tau zoo uas tsis yog - nplaum. Txawm li cas los xij, txawm tias nyob rau hauv cov xwm txheej zoo li no, thaj chaw muaj zog adhesion tseem nyob hauv cheeb tsam thiab tag nrho fouling tseem tsawg dua nrog cov hlau nto.

Lub ntsiab lus tseem ceeb: lub zog qis ntawm PTFE txhais tau hais tias feem ntau cov nplaum los yog cov coatings lo rau nws nrog kev nyuaj heev. Qhov no tsis yog ib qho teeb meem rau lub tshuab cua sov tab sis tuaj yeem kho lossis hloov kho qhov nyuaj dua Yog tias kev sib koom ua ke rau PTFE yog qhov tseem ceeb heev, kev kho mob tshwj xeeb yog siv los ntawm cov tshuab ua kom sov (xws li ntsev etching).

Cov ntsiab lus: Txo kev tu thiab ua kom lub neej ua haujlwm ntxiv hauv cov ntawv thov nyuaj
Qhov laj thawj kev tshawb fawb rau lub npe nrov uas tsis yog -stick thiab tiv thaiv-fouling zog ntawm PTFE yog nws lub zog nto qis - ~ 18 dynes / cm. PTFE cov yam ntxwv saum npoo uas feem ntau cov kua thiab cov khib nyiab tsis tuaj yeem txuas nrog, yog li cov pob zeb hauv av, hlau sludge thiab cov organic deposits tsis tsim lossis raug tshem tawm sai sai nrog kev siv zog tu tsawg.

Cov yam ntxwv no txo ​​qis txij nkawm downtime, tswj cov cua kub hloov pauv thiab ua kom lub neej ua haujlwm ntawm PTFE immersion heaters nyob rau hauv hnyav tshuaj thiab plating daim ntaub ntawv. Cov cua sov hlau yuav raug ua kom fouling uas txo qis kev ua tau zoo thiab yuav tsum tau ua kom nruj heev, tab sis PTFE cov cua sov muaj qhov chaw huv si thiab cov khoom tso tawm zoo ib yam. Vim nws cov tshuaj inertness, thermal stability thiab tsis tshua muaj zog nto PTFE yog ib yam khoom tshwj xeeb rau cua kub aggressive, deposit- ua cov txheej txheem kua.