Neng Theipi ea sekhomaretsi ea PTFE e sebelisetsoa ho koala likarolo tse baballang mongobo - joalo ka likabelo tsa elektroniki, li-flange tsa HVAC, kapa likoahelo tsa sets'oants'o sa lik'hemik'hale - monahano o tloaelehileng ke hore PTFE's hydrophobicity e tiisa sethibelo se phethahetseng sa mouoane oa metsi. Sena ha se nnete kamehla.
Limolek'hule tsa mouoane oa metsi li nyane. Li ka hasana ka litsela tse nyenyane haholo tseo metsi a mangata a ke keng a li khona. Sekhahla sa phetiso ea mouoane oa sebele oa metsi (WVTR) ea theipi ea PTFE e itšetlehile haholo ka k'hemistri ea PTFE le ho feta holim'a sebopeho sa ho roala - liphoso tse kang micropores, microcracks, le fiber encapsulation e sa fellang.
Aokai PTFE e hlahlobile WVTR ho pholletsa le liphahlo le botenya. Sengoliloeng sena se hlalosa hore na sebopeho sa lik'hemik'hale tsa PTFE, likoli tsa ho koahela, maano a botenya, le liphetoho tsa li-filler li kopana joang ho tseba hore na ts'ebetso ea thibelo ea mouoane e sebetsa joang.
PTFE Sebopeho sa Lik'hemik'hale - Ka bobeli Molemo le Moeli
1. Melemo - Hydrophobicity le Crystallinity
Sebopeho
Molemo bakeng sa Thibelo ea Mouoane oa Metsi
CF bond, matla a tlase a holim'a metsi
Limolek'hule tsa metsi ha li khahlise kapa ho qhibiliha holim'a PTFE - tšitiso ea mantlha khahlano le ho kenella ha mongobo.
Bokhabane bo phahameng (>90%)
Libaka tsa kristalline li batla li sa kenelle mouoane oa metsi - ha ho na tsela ea limolek'hule ka har'a likristale.
2. Meeli - Libaka tsa Amorphous le Matla a fokolang a Intermolecular
Matla a fokolang a li-intermolecular pakeng tsa liketane tsa limolek'hule tsa PTFE
tse ngata tse sa lefelloeng Li-voids libakeng tsa amorphous li theha litsela tsa ho hasana
Filimi e tiileng ea PTFE e fana ka WVTR ea boemo bo mahareng feela - e tlase haholo ho PVDC kapa EVOH
PTFE ha se thepa e thibelang lintho ka tlhaho
Tlhaloso ea bohlokoa: Intrinsic PTFE ke tšitiso e itekanetseng, eseng e ikhethang. Ts'ebetso ea theipi e sebetsang e itšetlehile haholo ka mefokolo ea ho roala.
Mathata a Bohlokoa a Koahelo - Micropores, Microcracks, le Fiber Wicking
Ena ke eona ntho e ka sehloohong e laolang ts'ebetso ea litšitiso tse sebetsang. Boholo ba litheipi tse khomarelang tsa PTFE li etsoa ka ho kenngoa kapa ho koaheloa ha PTFE hasane e lateloa ke sintering, nakong eo liphoso tsa tlhaho li hlahisoang habonolo:
Mofuta oa Sekoli
Mokhoa oa ho theha
Phello ho WVTR
Li-micropores
Li-solvents tse sa sebetseng hantle le motsoako o sa fellang oa resin li siea likheo tse hokahaneng
E theha litsela tse khaoletsang tsa ho kenella ha mouoane
Li-microcracks
Phapang ea katoloso ea mocheso lipakeng tsa substrate ea fiberglass le PTFE e baka ho phatloha ho hotle kamora ho chesa / ho pholile.
E bula likanale tse tobileng ka ho roala
Capillary wicking ea likhoele
Ho koaheloa ho sa fellang ha likhoele tsa khalase ho lumella mouoane oa metsi ho thella haufi le sebopeho sa fiber-resin ka ketso ea capillary.
E nolofalletsa mouoane ho pota-pota seaparo
Qeto e sebetsang: Kakaretso ea WVTR ea theipi e felileng ea PTFE e laoloa haholo ke defect density , eseng thepa ea tlhaho ea bongata ba PTFE resin.
Aokai PTFE e fana ka litheipi tsa sekhomaretsi tsa PTFE tse nang le boits'oaro bo laoloang. Bakeng sa lits'ebetso tse hlokang WVTR e tlase (<15 g/m²·letsatsi), re khothaletsa sehlopha sa rona sa multilayer coated, se sebelisang liphase tse tharo tsa ho kenella ho koala masoba le ho fokotsa bongata ba microcrack.
Botenya ba Coating le Phello ea Labyrinth - Maano a ho Fokotsa WVTR
Botenya ba ho roala bo eketsa tsela ea ho kenella ha mouoane empa ha bo koahele liphoso tse teng tsa sebopeho feela. Litharollo tse sebetsang haholoanyane tsa ntlafatso li thathamisitsoe ka tlase:
Leano
Mokhoa
Katleho
Ho roala ka mekhahlelo e mengata
Ho kenngoa khafetsa le ho sintering ho etsa hore likarolo tse latelang tsa ho roala li koahele likoti le ho fokotsa maemo a lijase tse ka tlase.
E phahameng - e sebetsang ka ho fetisisa
Lamellar filler phetoho
Li-filler tse inert (mica powder, li-flakes tsa khalase) li kopantsoe ka har'a liphahlo tsa PTFE ho qobella limolek'hule tsa metsi hore li khelohe (labyrinth effect)
E phahameng haholo - e fokotsa haholo WVTR
Seaparo se le seng se teteaneng
Tsela e telele ea ho hasana empa mefokolo e ntse e le teng
Tlase - ha e khothalletsoe feela
Tlhokomeliso ka li-filler: Ho kenya li-filler ho feta tekano ho tla beha maemo kotsing le thepa e sa tsitsang ea lihlahisoa tse felileng. Ho hlokahala ho leka-lekana.
Boemo ba Bokaholimo - Hydrophobic empa ha bo Qeto
Ho roala ha hydrophobic PTFE ho na le sebaka se phahameng sa ho kopana le metsi (ka tloaelo 110-120 °), se thibela ho etsoa ha filimi ea metsi e tsoelang pele holim'a metsi le ho theola ka tsela e sa tobang matla a ho khanna a ho kenella ha mouoane.
Leha ho le joalo: Monyetla ona oa bokaholimo o ke ke oa koala litšitiso tse mpe tse bakoang ke bofokoli ba kahare ba ho koahela. Haeba li-micropores kapa mapetsong a teng, mouoane oa metsi o ntse o tla phalla ho sa tsotelehe hydrophobicity ea holim'a metsi.
Kakaretso - Tšebetso ea Barrier e itšetlehile ka Taolo ea Sekoli
Ntlha
Tšusumetso ho WVTR
Taolo e Sebetsang
Bokhabane ba kahare ba PTFE
Motheo o mahareng
E tsitsitse - ha e laolehe sehlahisoa
Li-micropores tse tsoang ho sintering e sa phethahalang
Holimo (e etsa likhaoletso)
Ntlafatsa boemo ba sintering - ho pholile butle, mocheso o phahameng
Li-microcracks tse tsoang ho katoloso ea mocheso ha li lumellane
Holimo haholo
Ho roala ka mekhahlelo e mengata, sekhahla sa FEP se bohareng, ho pholile butle
Fiber wicking (encapsulation e sa phethahalang)
Phahameng
Netefatsa ho kenngoa ka botlalo - vacuum assist bakeng sa masela a teteaneng
Molemo ka ho fetisisa bakeng sa lisebelisoa tsa bohlokoa tsa thibelo
Ntho ea ho qetela ea ho nka: Ha tepi ea sekhomaretsi ea PTFE e sebelisoa bakeng sa ho tiisa mongobo o phahameng, liphoso tse entsoeng ke ts'ebetso (micropores, cracks, fiber wicking) e ntse e le bofokoli bo boholo ba bokhoni ba eona ba mokoallo. Ho tiisa ka mokhoa o ts'epahalang ho etsoa ka kalafo ea densification ho kenyeletsoa le coating ea li-multi-layer le phetoho ea li-filler . Theipi ea PTFE e sebetsang e sebetsa e le mokoallo o ka tšeptjoang oa mesebetsi e mengata tlas'a maemo a thata a hlokang mocheso o phahameng oa ho hanyetsa, ho hanyetsa ha kutu, botsitso ba mongobo, le ts'ebetso ea ho lokolloa ha lithupa ka nako e le 'ngoe - empa eseng e le mokoallo o ikemetseng o phahameng ka ho fetisisa joaloka tšepe ea tšepe kapa PVDC.
Ka kakaretso , thepa ea thibelo ea mouoane oa PTFE ha e khethollehe ke hydrophobicity ea PTFE feela. Intrinsic PTFE ke mokoallo o itekanetseng (WVTR 5-10 g/m²·letsatsi bakeng sa filimi e se nang sekoli). Leha ho le joalo, litheipi tse sebetsang li hlokofatsoa ke li-micropores, li-microcracks (ho tloha ho sa lumellaneng ha mocheso oa mocheso le fiberglass), le fiber wicking - ho phahamisa WVTR ho 50-200 g/m²·letsatsi.
Ho fihlela WVTR e tlase (<15 g/m²·letsatsi), qaqisa ho koaheloa ha li-multi-layer (3+ impregnation pass) le/kapa phetoho ea lamellar filler (10-20 wt% mica kapa li-flakes tsa khalase). Phello ea labyrinth e tsoang ho li-filler e qobella mouoane oa metsi ho nka litsela tse matsoelintsoeke, e fokotsang phetiso haholo. Leha ho le joalo, ho kenya li-filler tse phahameng ho ka fokotsa ho feto-fetoha ha maemo le ho se sebetse hantle - ho leka-lekana hoa hlokahala.
Na u hloka tepi e khomarelang ea WVTR PTFE e tlase bakeng sa ho tiisa ha mongobo? Aokai PTFE e fana ka limaraka tse koahetsoeng ka mekhahlelo e mengata le tse fetotsoeng ka lintlha tse ngotsoeng tsa tlhahlobo ea WVTR. Ikopanye le rona ka WVTR ea hau e hlokahalang, mocheso oa ts'ebetso, le litlhoko tsa ho tenyetseha.
Haeba o hloka lintlha tse qaqileng tsa tekheniki, tataiso ea ts'ebeliso, le litharollo tse ikhethileng bakeng sa potefolio ea sehlahisoa sa rona se felletseng, ho kenyeletsoa lesela la PTFE le mocheso o phahameng oa mocheso, tepi ea sekhomaretsi ea PTFE, lebanta la conveyor la PTFE, lebanta la fuser le se nang moeli, lesela le nang le lehlakore le le leng la PTFE, lebanta la conveyor le nang le mocheso o phahameng ka kopo ikopanye le rona
Ka ho ts'ehetsa filosofi ea khoebo ea botsebi le bots'epehi, re ikitlaelletsa ho fana ka litharollo tse ikhethileng tsa sebaka se le seng le tšebeletso e nahanang ea bareki.
AoKai PTFE ke setsebi
PTFE Coated Fiberglass Fabric Manufacturers le barekisi ba Chaena, ba khethehileng ka ho fana ka
PTFE Adhesive Tape,
PTFE Lebanta la Conveyor,
PTFE Mesh Belt Ho reka kapa ho rekisa lihlahisoa tsa
lesela la fiberglass tse koahetsoeng ka PTFE . Bophara bo bongata, botenya, mebala e fumaneha ka mokhoa o ikhethileng.
