Sengoliloeng sena se bua ka mokhoa oo moralo oa sebopeho sa microporous oa Teflon e phefumolohang (PTFE) e nang le mocheso o phahameng oa mocheso o lekanyang ho kenella ha moea ka ho kenella le thepa e sa tsitsang. Khohlano ea mantlha: ho kenella ha moea ho hloka li-pores tse bulehileng, athe ho kenella ka hare ho hloka hore ho be le ho teteana le ho se thupa ho hloka libaka tse boreleli. Mekhoa e leka-lekaneng ea moralo: ho laola bophara ba pore ka karolelano (0.1-2μm, hantle <0.5μm) ho thibela ho kenella ho qhibiliha le ho boloka matla a ho senya; laola porosity ho 50-70% (≈60% optimal) ho finyella Gurley 20-100s / 100cc le matla a dielectric ≥2kV bakeng sa filimi ea 0.13mm; amohela sebopeho sa pore sa marang-rang sa 3D se phahameng sa tortuosity (τ≈2.5-4) ho hatella likanale tse otlolohileng tsa ho lahla; haha ​​pore ea asymmetric gradient pore e nang le letlalo le teteaneng la letlalo (1-5μm) bakeng sa ho se thunye / ho kenya letsoho le ka hare ho hare-hare bakeng sa phefumoloho; sebelisa super-oleophobic/hydrophobic surface post-therapy ntle le ho thibela pore.

Sengoliloeng sena se fana ka melemo ea PTFE lesela la mocheso o phahameng joalo ka mecha ea litaba ea mocheso o phahameng oa mocheso. Matla a tšeletseng a bohlokoa: Ho hanyetsa mocheso o ikhethang (260 ° C e tsoelang pele, tlhōrō ~ 300 ° C), e fetang PPS (190 ° C) le aramid (200 ° C); Ho se sebetse ho feteletseng ha lik'hemik'hale khahlanong le li-acids, alkalis, solvents le oxidants, hydrolysis-resistant, aramid e sebetsang hantle ho feta le P84 khase ea flue e senyang; Ts'ebetso e phahameng ea ho hloekisa lerōle e nang le matla a tlase a tlase haholo a nolofalletsang ho tlosa kuku ea lerole le ho theoha ha khatello e tlase; Ts'ebetso e ntle haholo ea ho sefa ka boholo ba pore 0.1-3μm e hapang ho feta 99.99% ea likaroloana tsa PM2.5; Ho se be le mollo o nang le LOI ka holimo ho 95%, ka mekhoa e khahlanong le static e fumanehang; Matla a phahameng a mochini a tsoang ho matlafatso ea khalase ea fiberglass, e nang le mecha ea litaba e hloekileng ea PTFE e fanang ka maemo le> bophelo ba ts'ebeletso ea lilemo tse 4. E bapisa hantle khahlanong le PPS, aramid, Nomex, P84 le fiberglass filter media ho pholletsa le mocheso, khanyetso ea lik'hemik'hale, ho hanyetsa hydrolysis le ts'ebetso ea ho hloekisa.

Sehlooho sena se fana ka litharollo tse hlophisitsoeng bakeng sa ho thibela masala a sekhomaretsi le ho tsoa mali ka sekhomaretsi ha u sebelisa tepi ea mocheso o phahameng oa PTFE ho sireletsa menoana ea khauta ea PCB nakong ea kopano ea SMT. Tlhahlobo ea sesosa sa motso: masalla a hlaha ka lebaka la ho hlōleha ho kopane kapa ho fetisoa ha sefahleho; ho tsoa mali ho hlaha ka lebaka la ho theoha ha viscosity le sekhomaretsi se phallang tlas'a mocheso o phallang. Tharollo ea mantlha ke khetho e nepahetseng ea theipi: silicone PSA e nang le tlhōrō ea nako e khutšoanyane ≥300 ° C, e tsoelang pele ≥260 ° C, botenya bohle ba 0.08-0.13mm e nang le likarolo tse tšesaane tse khomarelang holimo, le setifikeiti se khahlanong le ho tsoa mali / masala. Taolo ea mehato e tšeletseng: ho hloekisa pele ho lamination ka IPA; lamination ea zero-tension e nang le phallo e feletseng ea moea; boemo bo ntlafalitsoeng ba mocheso oa phalliso ka ho futhumatsa ha bonolo (<2°C/s); ho ebola ho batang ka tlase ho 50 ° C ka lehlakoreng la 180 °; ts'ebetso ea hang-hang nakong ea lihora tse 24 le tšebeliso e le 'ngoe feela; ho hloleha ho sebetsana le ho hlakola IPA le tlhahlobo ea magnifier ea 40-50x. Bakeng sa li-PCB tse mahlakoreng a mabeli, nkela sebaka ka theipi e ncha pele e sebetsa ka lehlakoreng la bobeli.

Sehlooho sena se fana ka tataiso e hlophisitsoeng mabapi le ho thibela wrinkles ka PTFE phahameng-thempereichara lesela nakong sintering. Wrinkles ha e le hantle e bakoa ke ho fokotseha ho sa lekaneng ha mocheso le khatello ea maikutlo e sa tsitsang. Litharollo li koahela ts'ebetso e feletseng ea mosebetsi: taolo ea substrate e tala (e feletseng ea dewaxing / mocheso oa mocheso ho felisa khatello ea kelello ea ka hare); ho kenya le ho omisa (liaparo tse ngata tse tšesaane, mocheso o bonolo oa mocheso, li-roller tse sebetsang ka thata); taolo ea sebōpi sa sintering (1-3% overfeed bakeng sa tumello ea ho fokotseha ha mocheso, taolo ea micro-tension e koetsoeng, ho feto-fetoha ha mocheso ka har'a ± 5 ° C, curve preheating-sintering-cooling curve, libopi tsa moea e le tharollo e nepahetseng, li-rollers tse kobehileng); ho pholisa le ho beha (ho pholisa butle butle, boloka ho hasana ho fihlela ka tlase ho 100 ° C, ho pholile ka ho feletseng pele ho tsoelipana); ho lekola marang-rang ka tlhahlobo e matla ea leseli le ho sekena ha infrared.

Sehlooho sena se hlahloba kamoo sandblasting kapa matt finishing treatment e amang sebopeho sa bokaholimo ba lesela la mocheso o phahameng oa PTFE. Liphetoho li etsahala ka litekanyo tse tharo: Microscopic morphology e fetoha ho tloha ho seipone se boreleli ho ea ho sebopeho se makukuno se nang le boleng bo phahameng ba Ra/Rz, ho theha meaho ea 3D ea mochini bakeng sa ho tlamahanngoa ka mor'a moo. Botšepehi ba ho roala bo tobane le likotsi: PTFE layer thinning, exposure ea fiberglass substrate (e bakang tahlehelo ea thepa e sa thupeng, ho kenella ha mongobo, le ho fokotseha ha matla a mochine), hammoho le microcracks le litšila.

Sengoliloeng sena se hlahisa ts'ebetso e felletseng ea ho kenya lesela la fiberglass ka emulsion ea PTFE. Mehato e supileng ea bohlokoa: ① Pretreatment (dewaxing/desizing) ka 350-400°C ho tlosa lisebelisoa tsa boholo ba masela; ② Tlhahiso ea emulsion e nang le 40-55% e tiileng le li-surfactants bakeng sa ho kolobisa ho ntlafetseng; ③ Ho ima ka mokhoa oa dip-squeeze kapa ho roala ka lehare la ngaka; ④ Ho omisa ho 100-150 ° C ho etsa mouoane oa metsi ka bonolo le ho etsa filimi e omileng ea PTFE; ⑤ Sintering ho 360-390 ° C (ho fihlela ho 400 ° C) ho qhibilihisa likaroloana tsa PTFE ka filimi e tsoelang pele; ⑥ Multi-cycle impregnation-drying-sintering e pheta-pheta makhetlo a 2-4 ho fihlela botenya ba sepheo le lihlahisoa tsa resin (45-65%); ⑦ Kalafo ea morao-rao e kenyeletsang phekolo ea corona, ho fokotsa moeli, ho koala le ho hlahloba boleng. Lintlha tsa taolo ea mantlha: dewaxing e felletseng, ho kolobisa emulsion ka botlalo, ho omisa butle-butle, mocheso o nepahetseng oa sintering, le letsoalo le tsitsitseng la ho roala. Lihlahisoa li fana ka li-laminate tsa koporo tse nang le maqhubu a phahameng, mabanta a conveyor a mocheso o phahameng le lisebelisoa tsa meralo ea meralo.

Sengoliloeng sena se akaretsa matšoao a mantlha a ts'ebetso bakeng sa tepi ea PTFE ea mocheso o phahameng o sebelisoang ho koahela vacuum, kalafo ea mocheso oa vacuum le libaka tse tšoanang. Litlhoko tsa bohlokoa li fapane haholo le ts'ebeliso ea sepakapaka: ho tsoa mali ho bohlokoa haholo (TML≤1%, CVCM≤0.1%; limaraka tsa sefofane / optical li hloka TML≤0.5%, CVCM≤0.01%); ho hanyetsa mocheso ho tlameha ho netefatsoa bakeng sa bobeli ba PTFE substrate (260 ° C) le lera la sekhomaretsi; PSA ea silicone e hloekisitsoeng ka ho khetheha e hlokahalang ho thibela tšilafalo ea siloxane; matla a ho tšoara mocheso o phahameng a thibela ho qhoqhoa le ho phahamisa bohale; bohloeki ha bo hloke ho tšolloa ha fiber le li-ionic tse fokolang; tepi e khahlanong le static (ka holim'a resistivity 10⁶-10⁹ Ω / sq) e thibela tšenyo ea ESD; khanyetso ea plasma e tlameha ho hlahlojoa bakeng sa lits'ebetso tsa sputtering/PECVD; shrinkage ea mocheso ka tlase ho 2% e netefatsa ho nepahala ha masking.

Sengoliloeng sena se hlahisa li-solvents tsa organic tseo lesela la mocheso o phahameng oa PTFE le ka mamellang. Lesela la fiberglass le koahetsoeng ke PTFE le bonts'a ho se sebetse ho ikhethang ha lik'hemik'hale, ho hanyetsa hoo e batlang e le lihlapolli tsohle tse tloaelehileng tsa tlhaho tlas'a maemo a tloaelehileng a ho sebetsa ntle le ho qhibiliha, ho ruruha kapa karabelo ea lik'hemik'hale. Likarolo tse mamellehang li kenyelletsa: joala (methanol, ethanol, isopropanol), ketone (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), hydrocarbons (peterole, toluene, xylene, hexane), halogenated hydrocarbons (dichloromethane, carboniclodethyl, tether). THF), organic acids (glacial acetic acid, formic acid), amines le amides (triethylamine, DMF), phenols, le tse ling tse kang carbon disulfide, pyridine, silicone oli le brake fluid.

Sengoliloeng sena se akaretsa litlhoko tsa sekhahla sa ho pholisa nakong ea PTFE ea mocheso o phahameng oa mocheso oa lesela. Kamora ho chesa ka 380-400 ° C, lesela le tlameha ho feta ka potlako sebakeng sa 310-315 ° C sa crystallization-sensitive zone. Sekhahla sa ho pholisa se khothalelitsoeng ke bonyane 30-50 ° C / min (lesela le lesesaane le ka fihlela 100-200 ° C / min ka moea o pholileng). Ho pholile ka potlako (ho tima) ho hlahisa crystallinity e tlaase (45-50%), ho fana ka liphahlo tse bonolo, tse thata tse nang le libaka tse boreleli, ho khomarela ka matla, ts'ebetso e babatsehang e sa tsitsang, le ho hanyetsa delamination le ho phunyeha. Ho pholile butle (ho pholile ha sebōpi) ho fella ka crystallinity e phahameng (60-70%), e bakang liaparo tse thata, tse brittle tse atisang ho fokotseha, ho peeling le microcracks.

Sehlooho sena se bapisa mocheso oa kamore le mocheso o phahameng oa sekhomaretsi se nang le khatello ea silicone bakeng sa tepi ea PTFE. Boemo bo phahameng ba mocheso (120-180 ° C) bo etsa marang-rang a teteaneng a kopantsoeng a nang le matla a matla a ho kopanya, a thibela masala a sekhomaretsi ka mor'a ho ebola. E theha litlamo tsa lik'hemik'hale tse nang le lik'hemik'hale tse nang le PTFE substrates ka primer co-curing, ho felisa likotsi tsa delamination. Ho hōla ha mocheso o phahameng ho boetse ho tlosa li-volatile tsa limolek'hule tse tlaase pele ho tsoaloa, ho thibela ho phatloha le ho silafala ha oli ea silicone nakong ea ho futhumatsa ha pele.