Kab lus no qhia txog cov txheej txheem ua tiav rau impregnating fiberglass ntaub nrog PTFE emulsion. Xya cov kauj ruam tseem ceeb: ① Pretreatment (dewaxing / desizing) ntawm 350-400 ° C kom tshem tawm cov khoom siv textile sizing; ② Emulsion formulation nrog 40-55% khoom cov ntsiab lus thiab surfactants rau txhim kho wetting; ③ Impregnation ntawm dip-squeeze txoj kev los yog kws kho hniav txheej txheej; ④ Qhuav ntawm 100-150 ° C kom maj mam evaporate dej thiab tsim PTFE zaj duab xis qhuav; ⑤ Sintering ntawm 360-390 ° C (txog 400 ° C) kom yaj PTFE hais rau hauv zaj duab xis tas mus li; ⑥ Ntau lub voj voog impregnation-qhuav-sintering rov ua dua 2-4 zaug kom ncav cuag lub hom phiaj tuab thiab cov ntsiab lus resin (45-65%); ⑦ Kev kho mob tom qab suav nrog kev kho mob corona, ntug trimming, winding thiab kev soj ntsuam zoo. Cov ntsiab lus tseem ceeb tswj: ua kom tiav dewaxing, puv emulsion ntub dej, maj mam ziab, meej sintering kub, thiab zoo ib yam txheej ceev. Cov khoom lag luam ua haujlwm ntau zaus tooj liab-clad laminates, high-temperature conveyor siv thiab architectural membrane cov ntaub ntawv.

Tsab ntawv xov xwm no suav nrog cov ntsuas kev ua haujlwm tseem ceeb rau PTFE cov kab xev kub kub siv hauv lub tshuab nqus tsev, lub tshuab nqus tsev kho cua sov thiab cov chaw zoo sib xws. Cov kev cai tseem ceeb sib txawv heev ntawm kev siv atmospheric: outgassing yog qhov tseem ceeb tshaj plaws (TML≤1%, CVCM≤0.1%; aerospace / optical qib yuav tsum TML≤0.5%, CVCM≤0.01%); Qhov kub thiab txias yuav tsum tau kuaj xyuas rau ob qho tib si PTFE substrate (260 ° C) thiab nplaum txheej; tshwj xeeb purified low-outgassing silicone PSA yuav tsum tau tiv thaiv siloxane paug; high-temperature tuav lub zog tiv thaiv creep thiab ntug lifting; huv si xav tsis muaj fiber ntau los thiab cov ntsiab lus ionic tsawg; anti-static daim kab xev (nto resistivity 10⁶-10⁹ Ω / sq) tiv thaiv ESD kev puas tsuaj; plasma kuj yuav tsum raug soj ntsuam rau cov txheej txheem sputtering / PECVD; thermal shrinkage qis dua 2% ua kom cov npog qhov tseeb.

Kab lus no qhia txog cov kuab tshuaj organic uas PTFE cov ntaub ntawv kub kub tuaj yeem tiv taus. PTFE-coated fiberglass ntaub nthuav tawm tshwj xeeb tshuaj inertness, tiv taus ze li ntawm tag nrho cov organic solvents nyob rau hauv ib txwm ua hauj lwm tej yam kev mob yam tsis muaj dissolution, o los yog tshuaj tiv thaiv. Cov hom kev zam muaj xws li: cawv (methanol, ethanol, isopropanol), ketones (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), hydrocarbons (gasoline, toluene, xylene, hexane), halogenated hydrocarbons (dichlorochloromethane, carbon monoxide), ether, THF), organic acids (glacial acetic acid, formic acid), amines thiab amides (triethylamine, DMF), phenols, thiab lwm yam xws li carbon disulfide, pyridine, silicone roj thiab nres kua.

Kab lus no hais txog qhov yuav tsum tau ua kom txias thaum lub sij hawm PTFE high-temperature fabric sintering. Tom qab sintering ntawm 380-400 ° C, cov ntaub yuav tsum ceev nrooj dhau ntawm 310-315 ° C crystallization-sensitive cheeb tsam. Kev pom zoo kom txias yog tsawg kawg yog 30-50 ° C / min (cov ntaub nyias nyias tuaj yeem ua tiav 100-200 ° C / min ntawm cua txias). Kev ua kom txias sai sai (quenching) ua rau qis crystallinity (45-50%), yielding mos, tawv coatings nrog du nto, muaj zog adhesion, zoo heev uas tsis yog-stick kev ua tau zoo, thiab kuj rau delamination thiab cracking. Kev ua kom txias qeeb (lub qhov cub txias) ua rau muaj cov crystallinity siab (60-70%), ua rau cov tawv tawv tawv, tawv tawv, ua rau shrinkage, tev thiab microcracks.

Kab lus no piv rau chav kub thiab kub kub kom loj hlob ntawm silicone siab-rhiab nplaum nplaum rau PTFE daim kab xev. Kub-kub maturation (120-180 ° C) tsim dense crosslinked tes hauj lwm nrog muaj zog cohesive zog, tiv thaiv cov nplaum residue tom qab tev. Nws tsim cov tshuaj anchoring bonds nrog PTFE substrates ntawm primer co-curing, tshem tawm delamination txaus ntshai. High-temperature maturation kuj tshem tawm cov tsis tshua muaj molecular volatiles ua ntej xa khoom, tiv thaiv bubbling thiab silicone roj paug thaum thawj cua sov.

Daim ntawv qhia no npog PTFE high-temperature daim kab xev xaiv rau kev txhaj tshuaj molding demolding thiab anti-stick daim ntaub ntawv. Kev xaiv kub raws li: ≤260 ° C rau cov yas dav dav (tus qauv silicone PSA daim kab xev, 0.13-0.18mm); 260-300 ° C rau high-temperature engineering yas xws li PC, PA66, POM (high-temp silicone nplaum, 0.18-0.25mm); 300-400 ° C rau PEEK, LCP, PPS nyob ze cov neeg ua haujlwm kub (cov nplaum nplaum tsis ua haujlwm; siv cov ntaub nplaum tsis muaj PTFE lossis PFA zaj duab xis). Cov khoom siv raws li kev xaiv: tacky cov ntaub ntawv xav tau siab tso tawm ntshiab PTFE nto; iav / ntxhia ntim cov ntaub ntawv yuav tsum tau ua haujlwm hnyav 0.25mm + hnav-resistant daim kab xev; corrosive additives xav tau chemically resistant nplaum thiab ntom substrate; static-sensitive daim ntaub ntawv yuav tsum tau anti-static dub PTFE daim kab xev.

High-tensile PTFE high-temperature daim ntaub yog tsim los ntawm txheej PTFE mus rau high-strength fiberglass ntaub, muab tensile zog, tshav kub tsis kam, tsis-stick zog, tshuaj tiv thaiv, thiab tsis muaj kev sib txhuam. Cov ntawv thov tseem ceeb muaj xws li: kev lag luam xa khoom (lub thawv ntim cua sov, ci zaub mov, tshuab ziab khaub ncaws, ntawv / zaj duab xis ziab); composite molding tso tawm ntaub thiab kub xovxwm cushion liners; vuam tiv thaiv kab hlau rhuav thiab thermal rwb thaiv tsev tsho; hluav taws xob lub cev muaj zog thiab transformer rwb thaiv tsev; tsim zawv zawg bearings thiab cov kav dej txhawb nqa; chemical filtration thiab valve sealing nyob rau hauv corrosive ib puag ncig. Lub zog tensile siab ua kom ruaj khov nyob rau hauv qhov nro, tearing, rov flexing, thiab kub-kub txhua yam kev ntxhov siab thoob plaws cov kev siv ntau yam hnyav.

Thaum lub sij hawm sintering, PTFE hais ntawm fiberglass ntaub yaj saum 327 ° C, rhuav tshem thawj folded-chain lamellae thiab particle ciam teb los tsim ib qho amorphous yaj. Thaum txias, PTFE recrystallizes rau hauv spherulites tsim ntawm radially oriented lamellae, nrog crystallinity li 50-70%. Txias tus nqi txiav txim siab siv lead ua zoo meej: qeeb txias yields ntau dua crystallinity, loj spherulites, hardness ntau dua; ceev quenching muab finer spherulites thiab txhim kho yooj.

PTFE-coated fiberglass daim ntaub yog dav siv nyob rau hauv cov roj hmab ua rau nws cov cua kub tsis kam, tsis-stick khoom, thiab tsis muaj kev sib txhuam. Cov ntawv thov tseem ceeb muaj xws li: tso cov ntaub ntawv rau lub phaj / lub tshuab nqus tsev vacuum thiab lub log molding; tsis-stick conveyor siv rau qhib mills, calenders, thiab txias kab; interleave ntaub rau semi-tiav roj hmab cia; tshwj xeeb tuav ntawm silicone thiab fluororubber; thiab cov tais diav rau tom qab kho. Cov txiaj ntsig muaj xws li tshem tawm cov pwm adhesion, txo cov neeg siv kev tso tawm, tiv thaiv cov menyuam qhwv, thiab ua kom du demolding.

Tsawg sintering yoojyim PTFE unmelted, ua rau micro-pores, tsis zoo adhesion, ntxhib nto, tsis tshua muaj neeg kho tshuab zog, thiab milky tsos. Overheating degrades PTFE, ua cov pinholes, npuas, brittleness, daj-rau-dub xim, thiab cov pa phem. Ob leeg puas compactness, tsis-stick kev ua tau zoo, yooj, rwb thaiv tsev, thiab seem stability. Qhov zoo tshaj plaws ntawm 370-400 ° C yields semi-pob tshab, du, tan txheej. Kev kuaj pom: matte dawb = under-sintered; yellow / brittle = dhau-sintered. (296 kab lus)