Expanded fiberglass npuag (bulked yarn fabric) txawv hauv paus los ntawm cov pa fiberglass npuag hauv cov qauv xov paj. Los ntawm kev kho cua dav hlau siab, cov iav filaments txuas ntxiv raug sib cais, crimped, thiab fluffed rau hauv voluminous, paj zoo li xov paj. Qhov no tsim cov ntaub thicker, softer nrog superior thermal rwb thaiv tsev (cua khaubncaws sab nraud povtseg), zoo conformability, ntau pom efficiency, thiab txhim kho kua muag / flex kuj - ntawm tus nqi ntawm lub zog tensile zog me ntsis. Siv rau qhov kub kub gaskets, yeeb nkab qhwv, lim hnab, thiab qhov cub seals.

Raw khoom purity yog lub hauv paus ntawm PTFE high-temperature npuag kev ua tau zoo. High-purity PTFE emulsion (tsis muaj hlau ions, tsis tshua muaj-molecular-yuag residues) ua kom cov cua sov tsis kam (tsis yellowing mus txog 260 ° C), ruaj khov tsis-stick, thiab siab dielectric zog. Rau fiberglass, alkali-dawb E-iav (Na₂O <0.8%) tswj lub zog thiab rwb thaiv tsev ntawm qhov kub thiab txias; nruab nrab / siab-alkali iav ua rau degradation. Ua kom tiav kev tshem tawm ntawm cov xov paj sizing tiv thaiv carbonization thiab delamination. Purity ncaj qha cuam tshuam rau lub neej kev pabcuam, kev ua raws li qib zaub mov, thiab kev ntseeg tau ntawm hluav taws xob.

Ua ntej ziab ntawm fiberglass ntaub yog qhov tseem ceeb rau PTFE txheej tom ntej, resin impregnation, lossis lamination. Peb txoj kev kho tseem ceeb: tshem tawm cov dej noo ntawm 105-120 ° C (10-30 min nyob ntawm qhov hnyav), dewaxing / thermal tu ntawm 300-450 ° C (LOI <0.1%, zam> 500 ° C), thiab preheating ntawm 60-100 ° C ua ntej txheej. Tswj qhov kub ntawm qhov sib xws (± 5 ° C), yuam kom dehumidification, thiab tiv thaiv cov ntaub qhwv silane hauv qab 110 ° C. Khaws cov ntaub qhuav hauv cov hnab ntim khoom lossis chav qhuav (<30 ° C, <40% RH).

PTFE high-temperature daim kab xev muaj cov tshuaj ntsev zoo heev, tab sis cov ntsiab lus tsis muaj zog yog cov nplaum txheej thiab cov fiberglass substrate npoo. Kev soj ntsuam txoj kev: 1000h nruab nrab ntsev tshuaj tsuag (NSS), ntsuas tev lub zog tuav (≥80% xav tau), pom qhov tsis xws luag (lifting, blistering), thiab hlau substrate corrosion. Rau cov chaw hauv dej hiav txwv thiab cov ntsev-npaum huab cua: siv silicone PSA (tsis yog acrylic), tag nrho impregnated PTFE substrate, foob npoo nrog huab cua-resistant sealant, thiab siv primer rau cov hlau nto.

PTFE high-temperature npuag (PTFE-coated fiberglass) yog ze li ntawm chemically inert, tab sis qee yam khoom ua rau corrosion nyob rau hauv tej yam kev mob. PTFE ncaj qha nres tshwm sim nrog molten alkali hlau (sodium, poov tshuaj), muaj zog fluorinating agents (F₂, ClF₃) ntawm qhov kub thiab txias, thiab molten muaj zog alkalis saum 300 ° C. Indirect corrosion tshwm sim thaum hydrofluoric acid (HF), kub concentrated alkalis, los yog kub phosphoric acid nkag mus rau txheej tsis xws luag thiab tua lub fiberglass substrate. Rau kev pabcuam tshuaj lom neeg, siv cov yeeb yaj kiab PTFE ntshiab tsis muaj fiberglass.

PTFE high-temperature daim kab xev poob adhesion tom qab rov siv dua vim qhov chaw paug (plua plav, silicone roj), nplaum cohesive tsis ua hauj lwm (residue), los yog tsis muaj zog substrate bonding. Cov kev daws teeb meem: high-crosslink silicone PSA (tsis tshua muaj kev tsiv teb tsaws, sib npaug tack / tuav lub zog), primer kev kho mob ntawm PTFE substrate, ntom fiberglass backing, thiab tuav kom zoo (huv qhov chaw, txias tev, 180 ° lub kaum sab xis). Quantitative test validates kev txhim kho.

PTFE high-temperature npuag (PTFE-coated fiberglass) muaj cov thermal poob siab zoo nyob rau hauv nws qhov kev ua haujlwm ntawm -70 ° C txog 260 ° C. Nws tuaj yeem tiv taus kev kub ceev ceev, xws li txav los ntawm -50 ° C lub freezer mus rau 260 ° C kub xovxwm. Cov qib hwm tseem muaj sia nyob tam sim ntawd txias los ntawm 260 ° C rau hauv dej 10 ° C. Txawm li cas los xij, kev poob siab ntawm cov khoom los ntawm qhov kub siab tshaj 300 ° C (ze PTFE's 327 ° C melting point) yuav ua rau tawg tam sim ntawd thiab delamination. Lub fiberglass substrate muab qhov ntev stability; PTFE txheej yog qhov txwv.

PTFE high-temperature npuag yog dav siv nyob rau hauv kev lag luam tshuaj rau xya daim ntaub ntawv tseem ceeb: flange gaskets thiab cov yeeb nkab hauv ob sab phlu (resists muaj zog acids / alkalis), reactor thiab tank linings (tiv thaiv hlau corrosion, yooj yim tu), lim hnab rau corrosive flue gas (txog 260 ° C), anti-corrosion expansion pob qij txha rau ducts, ducts, molding, thiab hluav taws xob / thermal rwb thaiv tsev qhwv. FDA thiab UL qib muaj.

PTFE high-temperature daim kab xev khaws cia nyob rau hauv tej yam kev mob (10-25 ° C, 40-70% RH, deb ntawm UV / hnyav siab) muaj ib tug txheej txheem txee lub neej ntawm 3-6 lub hlis (khoom kim heev qib mus txog 12 lub hlis). Qhov tseem ceeb degradation pib: tev lub zog yuav tsum tsis txhob poob qis dua 70% ntawm tus nqi pib; tsis muaj nplaum residue tom qab tshem tawm qhov kub thiab txias; tsis muaj carbonization los yog tawg ntawm qhov ntsuas kub. Kev kuaj xyuas sai: phau ntawv qhia kev xav tsis zoo, 260 ° C qhov kev sim residue, thiab kev sim lamination shrinkage.

PTFE high-temperature npuag (PTFE-coated fiberglass) muaj plaub qhov txiaj ntsig zoo raws li kev tiv thaiv corrosion hauv ob sab phlu: tshuaj inertness (resists aqua regia, muaj zog alkalis, cov kuab tshuaj), qhov kub ntau (-70 ° C txog 260 ° C tas mus li, 350 ° C ncov), qhov ntev stability (<0.5% non-staining), elongation thiab stains. Siv nyob rau hauv cov kav dej tshuaj, desulfurization yees, pickling tank, thiab khoom noj khoom haus/pharma. FDA qib muaj.