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.

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.

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.

Qhov kev qhia luv luv no los ntawm Jiangsu Aokai tshuaj xyuas seb qhov kub thiab txias ntau npaum li cas ua rau PTFE qhov kub thiab txias. Tsawg sintering yoojyim cov khoom tsis zoo, ua rau micro-pores, tsis muaj zog txheej txheej-substrate bonding, ntxhib nto, tsis muaj zog txhua yam, thiab milky opaque tsos. Overheating induces PTFE thermal degradation, tsim cov pinholes, npuas, brittleness, daj-rau-dub discoloration, thiab tso pa phem. Ob qho tag nrho ua rau kev sib tsoo, kev ua haujlwm tsis zoo, ua kom yooj yim, rwb thaiv tsev, thiab qhov ntev stability.

PTFE high-temperature fabric insulating gaskets combine high dielectric zog (ruaj khov nyob rau hauv cov av noo), -70 ° C mus rau 260 ° C kub ntau yam, universal tshuaj tsis kam (tshwj tsis yog molten alkali hlau), non-stick deg (tiv thaiv creepage), anti-creep (fiberglass reinforcement vs. ntshiab PTFE), siab tensile zog μ0. V-0 nplaim taws ntsuas. Piv nrog rau mica, roj hmab, thiab ntshiab PTFE gaskets, PTFE daim ntaub muaj superior saj zawg zog, processability, thiab ntev mus ntev stability. Zoo tagnrho rau transformers, lub cev muaj zog rwb thaiv tsev, tshuaj flange sealing, thiab semiconductor khoom.

PTFE daim ntaub flatness thaum sintering yuav tsum nruj nro, kub, thiab tswj tswj. Cov txheej txheem tseem ceeb: stenter tshuab (pin daim hlau tuav dav, tiv thaiv weft shrinkage), gradient kub profile (slow cua sov → 380-400 ° C tuav → qeeb txias hauv qab 310 ° C ua ntej tso nro), pre-shrunk substrate (tshem weaving kev nyuaj siab ua ntej txheej), thiab uniform txheej thickness (tiv thaiv sib txawv melting). Steter restraint yuav tsum tau khaws cia kom txog thaum txias hauv qab ntawm PTFE crystallization point (kwv yees li 310 ° C) los tiv thaiv warpage.

Txheej uniformity thaum lub sij hawm PTFE emulsion impregnation ntawm fiberglass ntaub yog lub lifeline ntawm cov khoom zoo. Cov txheej tsis sib xws ua rau: tsis muaj cov nplaum tsis ua haujlwm (sib lo rau ntawm qhov nyias nyias), kev ua haujlwm tsis muaj zog (kev ntxhov siab, kev tsim kua muag), hluav taws xob tsis ruaj khov (kev tawg hluav taws xob poob mus rau 1/10), tshuaj nkag mus (pinhole corrosion), qhov teeb meem loj (warpage), thiab kev ua haujlwm tsis xws luag (siv wandering, thickness variation). Cov txheej txheej yuav tsum tau tswj xyuas meej ntawm emulsion viscosity, cov ntsiab lus khoom, cov ntaub ntom ntom, nyem qhov khoob, thiab ntau thaj chaw ziab / sintering profiles.

PTFE high-temperature fabric undergoes plaub theem ntawm kev hloov pauv raws li qhov kub thiab txias: hauv qab 260 ° C - qeeb micro-cracking thiab residual additive volatilization; ntawm 327 ° C (melting point) - crystalline-rau-amorphous hloov, txheej softens, delaminates los ntawm fiberglass; 400-500 ° C - PTFE depolymerizes (tso tawm cov pa roj carbon monoxide), txheej txheej ploj; saum toj 500 ° C - fiberglass softens (840 ° C softening point) thiab poob kev ncaj ncees. Nyob qis dua 260 ° C tas mus li, tsis txhob> 300 ° C peaks rau kev ua haujlwm nyab xeeb.