Dab tsi yog Lub Luag Haujlwm ntawm Cov Txheej Txheem Hloov Kho (Plasma, Tshuaj Etching) hauv kev txhim kho PTFE Tube Wettability?

Thaum lub ntuj hydrophobicity ntawm PTFE yog ib qho koob hmoov rau fouling tsis kam, nws yog ib tug foom tsis zoo nyob rau hauv cov ntaub ntawv ntawm chav condensation, thaum ib tug wetted nto yuav kis tau kub ntau npaum li cas ntau npaum li cas. Cov txheej txheem kev hloov kho saum npoo tuaj yeem siv los hloov cov cuab yeej no yam tsis muaj kev cuam tshuam cov tshuaj tiv thaiv thiab tuaj yeem ua rau PTFE hlab ua haujlwm zoo dua hauv kev siv hluav taws xob hloov pauv qhov chaw ntub dej tseem ceeb.

Nkag siab txog Hydrophobicity thiab Wettability ntawm PTFE
PTFE (polytetrafluoroethylene) tau lees paub rau nws cov yam ntxwv tsis yog -stick thiab tiv thaiv tshuaj tua kab mob, uas ua rau nws zoo meej rau ntau hom kev lag luam. Txawm li cas los xij, nws lub zog qis qis ua rau nws hydrophobic, yog li cov dej zoo li hlaws thiab dov tawm ntawm nws qhov chaw. Cov cuab yeej no muaj txiaj ntsig zoo hauv kev txo cov fouling rau qee yam kev siv tab sis tsis zoo rau cov txheej txheem hloov hluav taws xob xws li chav ua kom sov thiab boiling, uas yuav tsum tau muaj qhov ntub dej kom siab ntawm cov cua sov hloov.

Piv txwv li, nyob rau hauv condensation, ib tug wettable (hydrophilic) nto nyiam filmwise condensation, piv txwv li, tsim ib tug nruam nyias zaj duab xis ntawm cov kua nyob rau saum npoo uas txhawb kev hloov mus rau tshav kub. Nyob rau hauv sib piv, ib tug hydrophobic nto ua rau dropwise condensation, thaum dej tshwm nyob rau hauv daim ntawv ntawm cov tee dej sib txawv, uas tsis ua kom zoo tagnrho tshav kub hloov. Qhov kev ua tau zoo sib txawv no tau txhawb txoj kev txhim kho ntawm cov txheej txheem kev hloov kho saum npoo uas txhim kho cov wettability ntawm PTFE thaum tuav nws cov tshuaj tiv thaiv kab mob.

Cov txheej txheem rau kev hloov kho deg los txhim kho Wettability
Lub wettability ntawm PTFE raj tuaj yeem hloov kho los ntawm cov txheej txheem sib txawv ntawm qhov chaw hloov kho kom zoo dua cov cua sov ua haujlwm. Cov txheej txheem no feem ntau yog kev kho mob ntiav thiab tsis cuam tshuam cov khoom ntawm cov khoom, tab sis lawv txhim kho nws cov kev cuam tshuam nrog kua.

Kev Kho Mob Plasma
Kev kho ntshav ntshav yog ib qho ntawm cov txheej txheem feem ntau siv los hloov kho cov yam ntxwv ntawm PTFE. Nyob rau hauv cov txheej txheem no cov PTFE hlab yog raug rau ib tug ionised roj, los yog plasma, uas bombards lub nto thiab generates polar pawg, xws li carbonyl thiab hydroxyl, uas txhim khu lub zog saum npoo. Qhov no ua rau saum npoo ntau hydrophilic thiab ua rau nws ntub dej. Lub plasma- kho PTFE muaj dej sib cuag lub kaum sab xis ntawm 60℃thiab 80 degree, ib qho kev txo qis los ntawm PTFE tsis kho uas muaj lub kaum sab xis ntawm 108 degree.

Qhov kev kho qhov tob yog feem ntau txwv rau cov txheej txheej saum npoo thiab cov yam ntxwv ntawm PTFE tseem tsis hloov pauv. Qhov no tau lees paub tias cov khoom khaws nws cov tshuaj tiv thaiv siab thiab ua haujlwm ntev, thaum lub qhov hloov pauv txhim kho qhov cuam tshuam nrog cov txheej txheem dej.

Etching (Chemical)
Lwm cov txheej txheem siv los hloov qhov chaw ntawm PTFE yog tshuaj etching. Txoj kev no tshem tawm cov fluorine atoms ntawm PTFE nto nrog cov tshuaj reactive xws li sodium naphthalene. Tshem tawm cov fluorine atoms tawm tom qab cov pa roj carbon - nplua nuj nto uas yooj yim dua los ntawm dej thiab lwm yam kua. Lub rougher nto muab los ntawm cov tshuaj etching txhim kho lub wettability thiab tso cai rau kom zoo dua kub kis tau tus mob.

Cov nyhuv ntawm cov tshuaj etching ntawm lub wettability tuaj yeem qhia tau los ntawm kev txo cov dej sib cuag lub kaum sab xis, zoo ib yam li kev kho ntshav plasma. Lub hydrophilic nto tuaj yeem tsim los ntawm cov tshuaj lom neeg etching, uas yuav pab tau rau chav ua kom sov thiab kub kub hloov pauv.

Daim ntawv thov ntawm Hloov PTFE Tubing
Ntau yam kev siv hluav taws xob hloov pauv tau siv qhov chaw- hloov kho PTFE hlab qhov chaw ntub dej ua lub luag haujlwm tseem ceeb. Qee qhov kev siv tseem ceeb yog:

Steam Condensation: Cov kev hloov no txhim kho lub wettability ntawm PTFE nto, uas nyiam filmwise condensation, uas yog ho zoo dua li dropwise condensation. Qhov no txhim khu kev xa hluav taws xob thiab ua kom muaj zog ntawm chav condensers.

Boiling Heat Transfer Qhov kev txhim kho wettability kuj ua rau kom kub kub hloov mus rau qhov zoo dua, uas yog qhov tseem ceeb tshwj xeeb tshaj yog nyob rau hauv siab -kub daim ntawv thov uas ua kom cov cua kub zoo yog qhov tseem ceeb. Qhov chaw kho mob ua rau kom zoo dua nucleate boiling, ntau npaum li lub boiling ntawm ib tug hydrophobic nto.

Cov txheej txheem dej ntub dej: Lub peev xwm ntawm PTFE tubing rau cov txheej txheem ntub dej thiab xa cov cua kub zoo tuaj yeem ua rau muaj txiaj ntsig zoo hauv ntau cov txheej txheem tshuaj. Hloov kho PTFE hlab tuaj yeem txhim kho qhov ua tau zoo ntawm cov tshuab no.

Kev hloov kho saum npoo: Cov nyom thiab kev txwv
Muaj qee qhov teeb meem thiab cov kev txwv nrog cov kev hloov kho saum npoo av siv los txhim kho cov wettability ntawm PTFE hlab:

Kub thiab tshuaj lom neeg ruaj khov: Kev kho plasma thiab tshuaj etching tuaj yeem degrade nyob rau lub sijhawm, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias los yog tshuaj lom neeg. Txhawm rau kom tswj tau qhov kev ntub dej kom zoo, qhov chaw kho mob tuaj yeem plam nws thiab yuav tsum tau rov kho dua - ib ntus.

Kev Kho Mob Durability: Lub neej ntev ntawm qhov chaw- hloov kho PTFE yog nyob ntawm qhov ua tau ntev ntawm qhov chaw kho. Yog tias cov txheej txheem hydrophilic ploj los ntawm kev puas tsuaj los yog kev kub ntxhov ntawm PTFE tuaj yeem rov qab mus rau nws lub xeev hydrophobic qub.

Cov ntsiab lus
Cov txheej txheem kev hloov kho saum npoo zoo li kev kho ntshav ntshav thiab tshuaj etching muab ib txoj hauv kev rau kev txhim kho cov wettability ntawm PTFE hlab yam tsis hloov cov khoom ntawm cov khoom. Cov kev txhim kho no ua rau kom muaj cua sov zoo dua nyob rau theem- hloov pauv cov cua sov, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov xws li chav ua kom sov thiab kub kub hloov pauv uas yuav tsum muaj qhov ntub dej kom zoo tshaj plaws. Txawm hais tias kev hloov kho saum npoo yog ib qho cuab yeej siv tau zoo rau kev txhim kho cov cua sov hloov ntawm cov raj PTFE, qhov ntev - lub sij hawm ruaj khov ntawm cov kev hloov kho nyob rau hauv kev ua hauj lwm nyuaj tseem yog ib qho kev txhawj xeeb tseem ceeb rau lawv cov kev siv txuas ntxiv hauv kev lag luam. Nrog rau kev txhim kho ntawm kev tshawb fawb saum npoo av, cov tswv yim no tej zaum yuav yog qhov tseem ceeb hauv kev ua kom zoo ntawm cov khoom siv hluav taws xob thiab lwm cov tshuab thermal.