Nini Itheyiphu yokunamathisela ye-PTFE isetshenziselwa ukuvala izingxenye ezizwelayo kumswakama - njengezivalo zikagesi, amaflange e-HVAC, noma izivalo zeziqukathi zamakhemikhali - umcabango ovamile ukuthi i-hydrophobicity ye-PTFE iqinisekisa umgoqo ophelele womhwamuko wamanzi. Lokhu akulona iqiniso ngaso sonke isikhathi.
Amangqamuzana omhwamuko wamanzi mancane. Angasakazeka ngezindlela ezincane kakhulu amanzi amaningi angeke akwazi. Izinga langempela lokudlulisa umhwamuko wamanzi (WVTR) letheyiphu ye-PTFE lincike kancane kukhemistri ye-PTFE nokuningi esakhiweni sokumboza – amaphutha afana nama-micropores, ama-microcracks, kanye ne-fiber encapsulation engaphelele.
I-Aokai PTFE ihlaziye i-WVTR kuwo wonke ukwakheka kokumboza nogqinsi. Lesi sihloko sichaza ukuthi ukwakheka kwamakhemikhali e-PTFE, ukonakala kokumboza, amasu okujiya, nokuguqulwa kwesigcwalisi kuhlangana kanjani ukuze kutholwe ukusebenza komgoqo womhwamuko.
Isakhiwo Sekhemikhali se-PTFE - Kokubili Inzuzo kanye Nomkhawulo
1. Izinzuzo - Hydrophobicity kanye Crystallinity
Isici |
Inzuzo ye-Water Vapor Barrier |
Amabhondi e-CF, amandla aphansi angaphezulu |
Ama-molecule amanzi awakwazi ukukhangisa noma ukuncibilika endaweni ye-PTFE - umgoqo oyinhloko omelene nokungena komswakama |
Icrystallinity ephezulu (>90%) |
Izifunda ezicwebezelayo zicishe zingangenwa umhwamuko wamanzi - ayikho indlela yokusabalalisa kwamangqamuzana ngamakristalu. |
2. Imikhawulo - Izizinda Ezingama-Amorphous kanye Nezimpi Ezibuthakathaka Ze-Intermolecular
Amandla e-intermolecular abuthakathaka phakathi kwamaketanga e-molecular PTFE
I-voids enkulu yevolumu yamahhala ezizindeni ze-amorphous idala izindlela zokusabalalisa
Ifilimu eqinile ye-PTFE iletha kuphela i-WVTR yezinga eliphakathi - eliphansi kakhulu kune-PVDC noma i-EVOH
I-PTFE ayiyona into evimbelayo ngokwemvelo
Ukuqonda okubalulekile: I-PTFE yangaphakathi ingumgoqo omaphakathi, hhayi ohlukile. Ukusebenza kwe-tape okusebenzayo kuncike kakhulu ekulimaleni kokukhubazeka.
Ukukhubazeka Okubalulekile Kwe-Coating - Ama-Micropores, Ama-Microcracks, ne-Fiber Wicking
Lesi isici esibusayo esilawula ukusebenza kwesithiyo esisebenzayo. Amateyipu amaningi anamathelayo e-PTFE akhiqizwa ngokufakwa ngaphakathi noma ngendwangu yokuhlakazwa kwe-PTFE kulandelwa ukucwenga, lapho amaphutha emvelo enziwa kalula:
Uhlobo Lwesici |
I-Formation Mechanism |
Umthelela ku-WVTR |
Ama-Micropores |
Izinyibilikisi ezivuzayo kanye nokuhlanganiswa kwe-resin okungaphelele kushiya ama-void axhumene |
Idala izindlela ezinqamulelayo zokungena komhwamuko |
Ama-Microcracks |
Ukungezwani kokwanda okushisayo phakathi kwe-fiberglass substrate ne-PTFE kubangela ukuqhekeka okuhle ngemuva kokucwilisa/ukupholisa |
Ivula iziteshi eziqondile ngokugqoka |
I-capillary wicking ye-fibers |
Ukugoqa okungaphelele kwemicu yengilazi kuvumela umhwamuko ukuthi ungene eduze kwe-fiber-resin interface nge-capillary action. |
Inika amandla i-vapor bypass ezungeze i-coating |
Isiphetho esisebenzayo: I-WVTR iyonke yetheyiphu ye-PTFE eqediwe ilawulwa kakhulu ukuminyana kokukhubazeka , hhayi impahla engaphakathi yenqwaba ye-PTFE resin.
I-Aokai PTFE inikeza amateyipu okunamathela e-PTFE anomthamo olawulwayo wokunamathela. Ngezinhlelo zokusebenza ezifuna i-WVTR ephansi (<15 g/m²·day), sincoma ibanga lethu elinezendlalelo eziningi, elisebenzisa amaphasi amathathu okungena ukuze limboze amaphinifa ngokulandelana kanye nokunciphisa ukuminyana kwe-microcrack.
Ukuqina Kwe-Coating kanye Nomphumela We-Labyrinth - Amasu Okunciphisa i-WVTR
Ukuqina kwe-coating ekhulayo kunweba indlela yokungena komhwamuko kodwa kuvale kancane iziphambeko ezikhona zesakhiwo kuphela. Izixazululo ezisebenza kahle kakhulu zokuthuthukisa zibalwe ngezansi:
Isu |
Indlela |
Ukusebenza kahle |
I-Multi-layer coating |
Ukukhulelwa okuphindaphindiwe kanye nokucwiliswa kunika amandla izendlalelo zokumboza ezilandelayo ukuthi zimboze izimbobo zephinikhodi kanye nezindawo zokungasebenzi kahle zamajazi angaphansi. |
Okuphezulu - okusebenzayo kakhulu |
Ukuguqulwa kwe-Lamellar filler |
Ama-filler angenasici angenasici (impushana ye-mica, ama-flakes engilazi) ahlanganiswa abe yizimbotshana ze-PTFE ukuze aphoqelele ama-molecule amanzi ukuthi athathe ama-jika ajikayo (umphumela we-labyrinth) |
Inani eliphakeme kakhulu lama-WVTR |
Ijazi elilodwa elijiyile |
Indlela ende yokusabalalisa kodwa amaphutha asekhona |
Phansi – akunconyiwe uwedwa |
Isexwayiso ngama-filler: Ukulayishwa kokugcwalisa okweqile kuzobeka engcupheni ukuguquguquka kanye nempahla enganamathele yemikhiqizo eqediwe. Ibhalansi iyadingeka.
Isimo Esiphezulu - I-Hydrophobic kodwa Ayinqumi
I-hydrophobic PTFE coating ine-engeli ephezulu yokuxhumana namanzi (imvamisa engu-110-120 °), ivimbela ukwakheka kwefilimu yamanzi okuqhubekayo endaweni futhi yehlise ngokungaqondile amandla okushayela okungena komhwamuko.
Nokho: Le nzuzo engaphezulu ayikwazi ukuvala umgoqo ompofu obangelwa ukukhubazeka kwangaphakathi kokunamathela. Uma kukhona ama-micropores noma imifantu, umhwamuko usazosakazeka ngaphandle kokunaka i-hydrophobicity engaphezulu.
Isici |
Umthelela ku-WVTR |
Ukulawula Okungokoqobo |
I-Intrinsic PTFE crystallinity |
Isisekelo esimaphakathi |
Ilungisiwe - ayilawuleki emkhiqizweni |
Ama-Micropores avela ku-sintering engaphelele |
Phezulu (idala izinqamuleli) |
Lungiselela iphrofayili ye-sintering - ukupholisa kancane, izinga lokushisa eliphezulu |
Ama-Microcracks asuka ku-thermal expansion ukungafani |
Phezulu kakhulu |
I-Multi-layer coating, isendlalelo se-FEP esiphakathi, ukupholisa kancane |
I-fiber wicking (i-encapsulation engaphelele) |
Phezulu |
Qinisekisa ukufakwa okuphelele - i-vacuum assist yezindwangu eziwugqinsi |
Ukujiya kwe-coating (ungqimba olulodwa) |
Phansi |
Ayisebenzi iyodwa |
I-Multi-layer coating |
Phezulu (ivala amaphutha) |
Cacisa amaphasi okukhulelwa angu-2-4 |
I-Lamellar fillers (i-mica, ama-glass flakes) |
Iphakeme kakhulu (umphumela we-labyrinth) |
Engeza i-10-20 wt%, wandise ukuhlakazeka |
Kugcwaliswe + inhlanganisela yezendlalelo eziningi |
Okuphakeme kakhulu (<10 g/m²·usuku) |
Kuhle kakhulu ezinhlelweni zokuvimbela ezibucayi |
Ukuthathwa kokugcina: Uma iteyiphu yokunamathisela ye-PTFE isetshenziselwa ukuvala uphawu lokuswakama okuphezulu, amaphutha enamathela okwenziwa yinqubo (ama-micropores, imifantu, i-fiber wicking) ihlala ingubuthakathaka obukhulu bekhono layo lokuvimba. Ukubekwa uphawu okuthembekile kwenziwa ngokwelashwa kokuqina okuhlanganisa i-multi-layer coating kanye nokuguqulwa kokugcwalisa . Itheyiphu eyinhlanganisela ye-PTFE isebenza njengesithiyo esinokwethenjelwa semisebenzi eminingi ngaphansi kwezimo ezinzima ezidinga ukumelana nokushisa okuphezulu, ukumelana nokugqwala, ukuzinza komswakamo, kanye nokusebenza kokukhishwa okungeyona intonga ngesikhathi esisodwa – kodwa hhayi njengesithiyo esizimele sodwa esiphakeme kakhulu njenge-foil yensimbi noma i-PVDC.
Kafushane , indawo yokuvimbela umhwamuko wamanzi wetheyiphu yokunamathela ye-PTFE ayinqunywa i-hydrophobicity ye-PTFE iyodwa. I-PTFE yangaphakathi iyisithiyo esimaphakathi (WVTR 5-10 g/m²·usuku lwefilimu engenasici). Kodwa-ke, amateyipu asebenzayo ahlushwa ama-micropores, ama-microcracks (kusuka ku-thermal expansion ukungafani ne-fiberglass), kanye ne-fiber wicking - ukukhulisa i-WVTR kuya ku-50-200 g/m²·day.
Ukuze uzuze i-WVTR ephansi (<15 g/m²·usuku), cacisa ukumbozwa kwezendlalelo eziningi (amaphasi okufaka ama-3+) kanye/noma ukuguqulwa kwe-lamellar filler (10-20 wt% i-mica noma ama-flakes engilazi). Umthelela we-labyrinth ovela kuma-fillers uphoqa umhwamuko ukuthi uthathe izindlela ezimazombezombe, wehlise kakhulu ukudluliselwa. Kodwa-ke, ukulayishwa kokugcwalisa okuphezulu kunganciphisa ukuguquguquka nokusebenza okungeyona intonga - ibhalansi iyadingeka.
Udinga itheyiphu yokunamathela ye-WVTR PTFE ephansi yokuvala uphawu oluzwela umswakama? I-Aokai PTFE inikeza amamaki ahlanganiswe ngezingqimba eziningi naguquliwe ngedatha yokuhlola ye-WVTR ebhaliwe. Xhumana nathi nge-WVTR yakho edingekayo, izinga lokushisa lokusebenza, nezidingo zokuvumelana nezimo.
Okuqukethwe kuhlinzekwe ngu I-Jiangsu Aokai New Materials Technology Co., Ltd.
Uma udinga imingcele yezobuchwepheshe enemininingwane, isiqondiso sohlelo lokusebenza, nezixazululo ezenziwe ngokwezifiso zephothifoliyo yethu yomkhiqizo ogcwele ohlanganisa indwangu ye-PTFE yokushisa okuphezulu, i-PTFE itheyipu enamathelayo, ibhande le-PTFE mesh conveyor, ibhande le-fuser elingenamthungo, indwangu ye-PTFE enohlangothi olulodwa, ibhande lokudlulisela elikwazi ukumelana nokushisa okuphezulu , sicela usithinte.
Ukusekela ifilosofi yebhizinisi yobungcweti nobuqotho, sizinikela ekunikezeni izixazululo ezenziwe ngokwezifiso zokuma okukodwa kanye nenkonzo yamakhasimende ecabangelayo.
