Cov kev hloov pauv li cas 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 undergoesirreversibleaging kev hloov pauv los ntawm themoleculartothemacroscopiclevel.ManufacturersofPTFEhigh-temperaturefabriccanunderstand txog qhov txheej txheem dhau los ntawm cov nram qab no:

I.MicrostructuralChangesinthe PTFECoating

Molecularchaindegradation thiab oxidation: Thecarbon-fluorinemainchain undergoeschainscission, depolymerization, thiab oxidation, ua rau tsis muaj zog hauv molecular hnyav thiab cov qauv ntawm cov polargroupssuchascarbonylandcarboxylgroupsatchainends.

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 lub lossofchemicalbonding thiab mechanical interlockingforces ntawm PTFE thiab cov iav fiber.

Interfacialdebonding thiab delamination: Afterinterfacialfailure, thedifferenceinthermalexpansioncoefficients ntawm PTFEandglassfibergeneratesthermalstress, coj topeeling thiab sib cais ntawm cov txheej txheej los ntawm cov ntaub, ua rau inblistering, delamination, thiab exposedwhiteareas.

Degradationoftheglassfiberitself: Hightemperaturesandalkalinesubstanceserodetheglassnetwork, ua rau micro-cracksonthefibersurfaceandembrittlement.Meanwhile,alkalimetaloxidesintheglassfiberprecipitateathightemperatures, inducingstresscorrosionthatterverselydamagesthe.

III.ChangesinMacroscopicStructureandAppearance

Xim hloov: Cov ntaub ntawv hloov pauv hloov pauv los ntawm cov xim dawb lossis 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.

Dimensionalstability thiab flatness: 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;theglassfiberinterfaceisdestroyedbeforethefiberbody 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 hloov kho rau peb cov khoom lag luam - suav nrog PTFEhigh-temperaturefabric, PTFEhigh-temperaturetape, Teflonhigh -temperaturemeshbelts, seamlessbeltingforadhesivepresses, ib leeg-sided PTFEfabric, high-temperatureconveyorbelts, thiab high-temperaturefiberglassfabric-thov tsis pub muaj kev tiv tauj los ntawm cov nram qab no:

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