Yuav ua li cas cov kev hloov pauv tshwm sim hauv PTFE high-temperature npuag thaum lub sij hawm kev laus?

PTFE High-temperaturefabricisacompositematerialmadebyimpregnatingorcoatingglassfiberbasefabricwithpolytetrafluoroethylene(PTFE).

Underprolonged exposuretohightemperature, thermal-oxidativeconditions, ultravioletradiation, thiab mechanicalstress, nws cov txheej txheem undergoesirreversible aging hloov pauv los ntawm themoleculartothemacroscopiclevel.ManufacturersofPTFEhigh-temperaturefabriccanunderstand txog qhov txheej txheem dhau los ntawm cov nram qab no:

I.MicrostructuralChangesinthe PTFECoating

Molecular chain degradation thiab oxidation: Thecarbon-fluorinemainchain undergoeschainscission, depolymerization, thiab oxidation, ua rau poob qis hauv molecular hnyav thiab cov qauv ntawm cov polargroupssuchaascarbonylandcarboxylgroupsatchainends.

Changesincrystallinity: Shortchainsegments undergosecondarycrystallization.Intheearlystage,crystallinityrisesabnormally, ua rau cov coatingtobecomeharderandmorebrittle.Asdegradation intensifies, thecrystalline regions aredestroyedandthestructurecollapses.

Deteriorationofmicroscopicmorphology: Degradationandshrinkagestressgeneratenummerousmicro-cracksand pinholes, formingcorrosionchannels.Inseverecases, thecoatingsurfacepowdersandPTFEparticlesdetach.

II.StructuralChangesintheGlassFiberSubstrateandInterface

Failureoffibersizing/couplingagents: Silanecouplingagentsororganicsizingagentsontheglassfibersurface decomposeandcarbonizeathightemperatures ua ntej, ua rau cov kev poob ntawmchemicalbonding thiab mechanical interlockingforces ntawm PTFE thiab cov iav fiber.

Interfacialdebondinganddelamination: Afterinterfacialfailure,thedifferenceinthermalexpansioncoefficients nruab nrab ntawmPTFEandglassfibergeneratesthermalstress, leadtopeelingandsparationofthecoating los ntawm cov ntaub, ua rau inblistering, delamination,andexposedwhiteareas.

Degradationoftheglassfiberitself: Hightemperaturesandalkalinesubstanceserodetheglassnetwork, ua raumicro-cracksonthefibersurfaceandembrittlement.Meanwhile,alkalimetaloxidesintheglassfiberprecipitateathightemperatures, inducingstresscorrosionthaum cuam tshuam cuam tshuam.

III.ChangesinMacroscopicStructureandAppearance

Xim hloov: Cov ntaub ntawv hloov maj mam hloov los ntawm cov xim dawb los ntawm cov xim dawb, xim av, xim av, lossis xim dub, tshwm sim los ntawm cov pa roj carbonization ntawm cov txheej txheem ntawm lub ntsej muag, adhesionoforganiccontaminants, thiab residualproducts los ntawm minor PTFE degradation.

Dimensionalstabilityandflatness: Shrinkagedeformation tshwm sim, cov ntaub plaub yuav tsis sib xws, andedgescurl.This istheresultofmolecular chaindisorientationandinterfacialstressrelease.

Surfaceroughening: Thesmoothfeeldisappears, andthesurfacebecomesroughandlosesitsgloss.Inseverecases, powderingisobserved when touched, indicator PTFEpowdering.

Mechanicalstructuralcollapse: Cov ntaub ntawv ua tiav losses yooj yooj yim thiab tawg suponfolding.Thecoatingextensivelyseparates los ntawm cov hauv pausfabric, ua rau tag nrho lossesoffunctionality.

IV.TheEssenceoftheAgingProcess

Theabovechangesconstituteaprogressiveprocessof'coatingdegradation →interfacialfailure → substratedegradation.'PTFElosesitsinertnessanddevelopscracks;theglassfiberinterfaceisrestedbeforethefiberbody nws tus kheej, leadtodelamination;ulti mately, theentirestructure becomes brittle, hmoov, thiab disintegrates.Controllingoperatingtemperatures, tsis txhob thermalshockfromrapidheatingandcooling, thiab tiv thaiv kev sib cuag nrogacidsandalkaliscaneffectivelyslowdownthisstructuralaging txheej txheem.

Cov ntaub ntawv saum toj no yog muab los ntawmJiangsu OKNewMaterialTechnology Co., Ltd.

Yog tias koj xav paub ntxiv txog cov ncauj lus qhia ntxaws ntxaws, daim ntawv thov scenarios, thiab kev xaiv xaiv rau peb cov khoom lag luam - suav nrog PTFEhigh-temperaturefabric, PTFEhigh-temperaturetape, Teflonhigh -temperaturemeshbelts, seamlessbeltingforadhesivepresses, ib sab PTFEfabric, high-temperatureconveyorbelts, thiab high-temperaturefiberglassfabric-thov tsis pub muaj kev tiv tauj los ntawm cov nram qab no:

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