Nkhaniyi ikufotokoza njira zonse zofunika zopangira nsalu za fiberglass ndi PTFE emulsion. Masitepe asanu ndi awiri ofunika: ① Pretreatment (dewaxing/desizing) pa 350-400°C kuchotsa zinthu zoyezera nsalu; ② Mapangidwe a emulsion okhala ndi 40-55% olimba komanso zowonjezera zowonjezera pakunyowetsa bwino; ③ Kulowetsedwa kudzera mu njira yofinya kapena zokutira tsamba la dokotala; ④ Kuyanika pa 100-150 ° C kuti musungunuke madzi pang'onopang'ono ndikupanga filimu yowuma ya PTFE; ⑤ Sintering pa 360-390 ° C (mpaka 400 ° C) kusungunula particles PTFE mu filimu mosalekeza; ⑥ Mipikisano mkombero impregnation-kuyanika-sintering mobwerezabwereza 2-4 nthawi kukwaniritsa chandamale makulidwe ndi utomoni okhutira (45-65%); ⑦ Kuchiza pambuyo pochiza kuphatikizirapo kuchiza kwa corona, kudula m'mphepete, kutsekereza ndi kuyang'ana bwino. Kore ulamuliro mfundo: dewaxing wathunthu, zonse emulsion wetting, pang'onopang'ono kuyanika, yeniyeni sintering kutentha, ndi kusasinthasintha ❖ kuyanika kachulukidwe. Zogulitsa zimagwiritsa ntchito ma laminates okhala ndi mkuwa wokwera kwambiri, malamba onyamula kutentha kwambiri komanso zida zomanga.

Nkhaniyi ikukhudzana ndi zizindikiro zazikulu za PTFE tepi yotentha kwambiri yomwe imagwiritsidwa ntchito popaka vacuum, chithandizo cha kutentha kwa vacuum ndi malo ofanana. Zofunikira zazikulu zimasiyana kwambiri ndi kugwiritsa ntchito mlengalenga: kutulutsa mpweya ndikovuta kwambiri (TML≤1%, CVCM≤0.1%; magalasi owulutsa ndege / kuwala amafuna TML≤0.5%, CVCM≤0.01%); kukana kutentha kuyenera kutsimikiziridwa pa gawo lapansi la PTFE (260 ° C) ndi wosanjikiza zomatira; Siloxane PSA yoyeretsedwa mwapadera imafunikira kuti mupewe kuipitsidwa kwa siloxane; Kutentha kwakukulu kumalepheretsa kukwawa ndi kukweza m'mphepete; ukhondo sumafuna kukhetsa kwa ulusi komanso kutsika kwa ayoni; tepi yotsutsa-static (resistivity pamwamba 10⁶-10⁹ Ω/sq) imalepheretsa kuwonongeka kwa ESD; kukana kwa plasma kuyenera kuwunikidwa panjira za sputtering/PECVD; Kutsika kwamafuta pansi pa 2% kumatsimikizira kubisala bwino.

Nkhaniyi ikuwonetsa zosungunulira za organic zomwe nsalu ya PTFE yotentha kwambiri imatha kupirira. Nsalu ya PTFE-yakutidwa ndi fiberglass imawonetsa kusakhazikika kwapadera kwamankhwala, kukana pafupifupi zosungunulira zonse wamba pansi pamikhalidwe yabwinobwino yogwirira ntchito popanda kusungunuka, kutupa kapena kuchitapo kanthu. Magulu olekerera akuphatikizapo: mowa (methanol, ethanol, isopropanol), ketoni (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), ma hydrocarbons (petulo, toluene, xylene, hexane), halogenated hydrocarbons (dichloromethylene), carbon dioxide, ether THF), ma organic acid (glacial acetic acid, formic acid), amines ndi amides (triethylamine, DMF), phenols, ndi ena monga carbon disulfide, pyridine, silikoni mafuta ndi brake fluid.

Nkhaniyi ikukhudza kuzirala zofunika pa PTFE mkulu-kutentha nsalu sintering. Pambuyo pa sintering pa 380-400 ° C, nsaluyo iyenera kudutsa mofulumira kudera la 310-315 ° C crystallization-sensitive zone. Kuzizira kovomerezeka ndi osachepera 30-50 ° C/mphindi (nsalu yopyapyala imatha kufikira 100-200 ° C/mphindi kudzera kuzizira kwa mpweya). Kuzizira kofulumira (kuzimitsa) kumatulutsa kuwala kocheperako (45-50%), kumapereka zokutira zofewa, zolimba zokhala ndi malo osalala, zomatira zolimba, kuchita bwino kosagwira ndodo, komanso kukana delamination ndi kusweka. Kuziziritsa pang'onopang'ono (kuzizira kwa ng'anjo) kumabweretsa kuwala kwakukulu (60-70%), kumapangitsa kuti zokutira zolimba, zowonongeka zomwe zimachepa, kusenda ndi microcracks.

Nkhaniyi ikufananiza kutentha kwa chipinda ndi kutentha kwapamwamba kwa zomatira za PTFE za PTFE. Kutentha kwapamwamba (120-180 ° C) kumapanga maukonde ophatikizika okhala ndi mphamvu zolumikizana mwamphamvu, kuteteza zotsalira zomatira pambuyo pakusenda. Amapanga ma anchoring bond okhala ndi magawo a PTFE kudzera pa primer co-curing, kuchotsa ziwopsezo za delamination. Kutentha kwapamwamba kumachotsanso kusungunuka kwa mamolekyu musanayambe kubereka, kuteteza kuphulika ndi kuipitsidwa kwa mafuta a silicone pakuwotcha koyamba.

Bukuli limakhudza kusankha kwa tepi yotentha kwambiri ya PTFE pakumangira jekeseni ndi ntchito zotsutsana ndi ndodo. Kusankha kotengera kutentha: ≤260 ° C kwa pulasitiki wamba (standard silicone PSA tepi, 0.13-0.18mm); 260-300 ° C kwa mapulasitiki opangira kutentha kwambiri monga PC, PA66, POM (zomatira za silicone zapamwamba, 0.18-0.25mm); 300-400 ° C ya PEEK, LCP, PPS pafupi ndi othamanga otentha (tepi yomatira imalephera; gwiritsani ntchito nsalu ya PTFE yopanda zomatira kapena filimu ya PFA). Kusankhidwa kozikidwa pazida: zida zomangira zimafunikira malo omasuka a PTFE; magalasi/mineral zodzazidwa ndi zinthu zimafuna heavy-ntchito 0.25mm+ kuvala zosagwira tepi; zowonjezera zowononga zimafuna zomatira zosagwirizana ndi mankhwala ndi gawo lapansi lowundana; mapulogalamu osasunthika amafunikira tepi yotsutsa-static yakuda ya PTFE.

Nsalu yotentha kwambiri ya PTFE imapangidwa ndi kupaka PTFE pansalu yamphamvu kwambiri ya fiberglass, yomwe imapereka mphamvu zolimba, kukana kutentha, katundu wosagwira ndodo, kukana mankhwala, komanso kugundana kochepa. Ntchito zazikuluzikulu zikuphatikiza: kutumizira mafakitale (kutengera kutentha, kuphika chakudya, zowumitsira nsalu, kuyanika mapepala / filimu); nsalu zomangira zophatikizika komanso zomangira zomangira zotentha; kuwotcherera makatani oteteza ndi ma jekete oteteza kutentha; magetsi galimoto ndi thiransifoma kutchinjiriza; kumanga zitsulo zotsetsereka ndi zothandizira mapaipi; kusefera kwa mankhwala ndi kusindikiza ma valve m'malo owononga. Kulimba kwamphamvu kwamphamvu kumatsimikizira kulimba pansi pa kukanidwa, kung'ambika, kusinthasintha mobwerezabwereza, komanso kupsinjika kwamakina kwapamwamba pamakina osiyanasiyana olemetsa.

Pa sintering, PTFE particles pa fiberglass nsalu kusungunuka pamwamba 327 ° C, kuwononga choyambirira apangidwe-unyolo lamellae ndi tinthu malire kupanga amorphous kusungunuka. Ikazizira, PTFE imakhazikikanso kukhala ma spherulites opangidwa ndi ma radially oriented lamellae, okhala ndi crystallinity kuyambira 50-70%. Kuzizira kumatsimikizira ungwiro wa kristalo: kuzizira pang'onopang'ono kumapereka crystallinity yapamwamba, ma spherulites akuluakulu, kuuma kwakukulu; kuzimitsa mwachangu kumapereka ma spherulites abwino komanso kusinthasintha bwino.

PTFE- TACHIMATA fiberglass nsalu chimagwiritsidwa ntchito pokonza mphira chifukwa kutentha kukana, sanali ndodo katundu, ndi otsika mikangano. Ntchito zazikuluzikulu zikuphatikiza: kutulutsa zingwe za mbale / vacuum vulcanization ndi kuumba matayala; malamba osamata a mphero zotseguka, makalendala, ndi mizere yozizirira; nsalu yotchinga yosungiramo mphira yomaliza; kusamalira mwapadera silicone ndi fluororubber; ndi ma tray ovunikira kuti ayeretsedwe. Ubwinowu umaphatikizapo kuthetsa kumatira kwa nkhungu, kuchepetsa kugwiritsa ntchito zotulutsa, kuteteza kukulunga kwa ma roller, ndikuwonetsetsa kuti akugwetsa bwino.

Low sintering masamba PTFE unmelted, kuchititsa yaying'ono pores, osauka adhesion, zaukali pamalo, otsika makina mphamvu, ndi yamkaka maonekedwe. Kutentha kwambiri kumawononga PTFE, kumatulutsa timabowo, thovu, brittleness, mtundu wachikasu ndi wakuda, komanso utsi wapoizoni. Zonsezi zimawononga kulimba, kusagwira ntchito kwa ndodo, kusinthasintha, kutsekereza, komanso kukhazikika kwa mawonekedwe. Mulingo woyenera kwambiri wa 370-400°C umatulutsa zowoneka bwino, zosalala, zokutira. Cheke chowoneka: matte white = under-sintered; yellow/brittle = over-sintered. (296 zilembo)