Bonding PTFE

Siv epoxy cement los yog nplaum rau sealing polymer rau iav thiab hlau thiab rau nws tus kheej.

Kev tiv thaiv ntawm polytetrafluorethylene (PTFE) rau txhua yam kev ua raws li cov lus dab neeg thiab feem ntau muaj txiaj ntsig zoo li nws cov tshuaj inertness.Tab sis cov qualities no muaj ib tug tseem ceeb drawback, uas polymer yog heev nyuaj rau kev ntseeg siab rau lwm yam ntaub ntawv los yog rau nws tus kheej.Muaj kev daws teeb meem rau qhov teeb meem no coj los rau tus sau txoj kev mloog los ntawm lub tuam txhab hu ua Reltek.(Ntau ntxiv txog lawv hauv qab).Kev daws teeb meem yog Sodium Naphthalide yaj hauv 2-Methoxyethyl Ether lossis hauv Tetrahydrofuran.Qhov no yog siv los ua ib qho etchant los hloov cov fluorine atoms rau ntawm qhov chaw nrog ntau hom reactive thiab bondable molecular hom.Tom qab etching lub polymer nto yog ntau ntau txais ntawm ntau yam cements, nrog rau epoxy resin adhesives xws li Araldite, los yog ntau tshaj tshwj xeeb Reltek Epoxy Resins.Lub etching yog ncaj nraim thiab koom nrog nthuav tawm cov roughened thiab degreased polymer nto mus rau ib qho kev daws ntawm Sodium Naphthalide rau li 2 feeb thiab tom qab ntawd ntxuav lub etched nto nrog Isopropanol.Lub etched nto yog ruaj khov thiab mechanically resistant thiab bondable.Qhov nyuaj tsuas yog kev tsim thiab tuav ntawm Sodium Naphthalide complex.

Sodium Naphthalide yog ib qho muaj zog heev txo tus neeg sawv cev, thiab nws reacts sai heev nrog atmospheric Oxygen thiab dej.Ib qho tseem ceeb raug rau qhov cua yuav sai sai deactivate nws.Nws yog li no zoo tshaj plaws tsim thiab siv nyob rau hauv ib lub hnab looj tes nyob rau hauv nitrogen los yog siv Scklenk technology.

Hauv kev npaj ua haujlwm los ntawm tus sau, 2.5 gm ntawm Naphthalene (GPR Rectapur) tau yaj hauv 25 ml ntawm Tetrahydrofuran hauv Schlenk raj.Rau qhov sib tov no 0.2 gm ntawm freshly txiav sodium hlau tau ntxiv.Qhov chaw huab cua nyob rau hauv Schlenk raj tau purged nrog Argon thiab kaw nrog ib tug Subaseal stopper.Sab kais raug kaw thiab lub raj schlenk tau muab tso rau hauv ib qho dej da dej tuav ntawm 45C rau kaum ob teev.

Hauv kev siv, Sodium Naphthalide yog qhov zoo tshaj plaws hauv Schlenk raj lossis hauv lub hnab looj tes thiab cov khoom siv ntawm Nitrogen lossis Argon yog qhov zoo los tiv thaiv oxidation reagent thaum siv.Ib qho kev npaj rau etching nyias polymer raj rau sealing rau hauv stainless hlau los yog iav raj.

Lub raj polymer rau etched yog kaw nyob rau hauv qhov kawg kom tiv thaiv aspiration ntawm lub etchant, thiab muab tso rau hauv lub bore ntawm ib tug hypodermic koob uas pierces lub subaseal.Lub Subaseal yog ntau yam kaw nyob rau hauv uas nws muaj peev xwm nqa tau ntau lub raj ntawm txawv diameters.Qhov no txhais tau hais tias cov raj dav dav (txog 6 hli od) tuaj yeem etched li no.