Bawo ni a ṣe le ni ilọsiwaju ti nrakò ati idaduro igba pipẹ ti Teflon ti o ga julọ ti o ni iwọn otutu ti o ga julọ?

I.MolecularNetworkTopology Imudara tiSiliconeAdhesiveLayer–Imudara OlopoboboAtakoCreep

1.HighMQResin/SiliconeRubberRatioand'Lile-Core'Eto

Awọn iṣelọpọ ti iṣelọpọMQsiliconeresinasthecoretackifieratififun agbara, npọ si MQ/gumratioto1.2:1–2:1(ti o ga ju awọn ipele aṣa lọ).Hi kosemi 'lile-alakoso' microrodomains laarin awọn orihesivelayer, eyi ti o ni idiwon igbese ti siloxanechainsections ati afikun ohun ti imudara awọn igbekalẹmodulus aticreepresistanceatelevated awọn iwọn otutu.

2.Incorporation ofHeat-ResistantRigidGroupsandHigh-Bond-EnergyCrosslinkingSites

Phenyl, diphenyl, tabi ẹgbẹ-ara-carborane yoo ṣe afihan sinu awọn ti polydimethylsiloxaneegungun (fun apẹẹrẹ, 20-30mol% akoonu phenyl) lati ṣe idiwọ awọn ibaraẹnisọrọ gbigbona ati mu awọn iwọn otutu iyipada gilasi ati awọn rmaldecompositionemperature.Thecrosslinkingsystempreferentiallyemploys addition-curehydrosilylation(Pt-catalyzed),didara–C–C–tabi–Si–C–crosslinkingbridgeswithsuperiorthermalstability.

3.ControlofMolecularWeightLaarinCrosslinks(Mc)ati Awọn abawọn Nẹtiwọki

Nipa ṣiṣe deedee akoonu hydroogen ti nṣiṣe lọwọ ati gigun gigun ti epo ti o ni silikoni epo, ni ibatan simallanduniformMc (isunmọ 5,000-15,000g/mol) ti ṣaṣeyọri, rii daju pe ohun naa workmaintainshighresilienceevenathightemperatures.Extendedpost-curingorhigh-temperatureannealingisappliedtoconsumeresidualreactivegroupsandreducesrelaxation

II.GradientModulus MultilayerAdhesive Structure–IwọntunwọnsiTackatiAtako Iwakiri

'Primer-anchoringlayer+High-moduluscohesivelayer+Viscoelasticfunctionallayer'apẹrẹ aláwọ̀ mẹ́ta

1.Primer-anchoringlayer(1–3μm): Lilo asilanecouplingagent ti o ni awọn ẹgbẹ apoxyoracryloyloxy, iṣaju-polymerized pẹluMQresin, lati pese ọna asopọ kemikali si awọn PTFEsubstrateati àjọ-agbelebu pẹlu oke siliconelayer.

2.High-moduluscohesivelayer (akọkọ, approx.30-50μm): Useshigh-MQ-ratio, high-phenyl-content, high-crosslink-densitysiliconeadhesivetofurnisharobustshear-resistantskeleton.

3.Viscoelasticfunctionallayer (incontactwiththeadherend,3-8μm): Employslow-MQ-ratioorhydroxy-terminatedsilicone-epo-modifiedsoftsiliconeadhesivetolowersurfacemodulusandensurerapidwettingandconformabilitytotheadherendatelevatedtemperatures.

III.Nanofillers fun Ṣiṣeto Kọja ti ara ati Egungun Atako Ooru

1.In-SituReinforcementandSurfaceModificationofNano-Silica

Themanufacturerusesfumedsilica(specificsurfaceaarea200-380m²/g),oju-itọju pẹlu vinyltriethoxysilaneorhexamethyldisilazane,ataloadingof10-25wt%.Thenano-SiO₂formshydrogenbondsandphysicaladsorptionPlalusiloxanechains reversiblephysicalcrosslinkingnetworkthatdissipatesenergyand atidena molecularchainslippageAthightemperatures.High-sheardispersione dadaduro wipe silica tẹlẹ 'awọn iṣupọ'pẹlu agglomerateizes ni isalẹ100nm,avoidingstressed.

2.DirectionalCreepResistancevia2DNanomaterials

Afikun ti1–5wt%diẹ-Layergrapheneororgano-modifiednano-montmorillonite,eyiti o ṣe ilana idayatọ ilana nipasẹ rirẹ-inducedalignment nigba ti aso,fọọmu 'mazeeffect'paralleltothetapep ọna, ni pataki ti npọ si resistancetomolecularchainmotion ninu itọsọna irẹrun. Eyaworann funni ni itara aiṣedeede gbigbona, idinku awọn aaye ibi-itọkasi ati idaduro imunadoko gbona.

IV.ChemicallyIntegratedSubstrate–AdhesiveInterface andProcessControl

1.SurfaceActivation atiBifunctionalPrimerfunChemicalBonding

Awọn PTFE Surface wa ni akọkọ itọju pẹluasodium–naphthalene–THFsolutionorlow-pressureargon/oxygenplasmatogenerateanactivated Layer ti o ni awọn carboxylandhydroxylgroups.Aprimersolution ti o ni awọn moleku iṣẹ-bi fun apẹẹrẹ, isocyanatesilane, titanatecouplingagent+theepoxymedialy) ated.Oneendoftheprimerreactswith–OH/–COOHonthePTFE Surface,nigbati omiiran kopa ninu hydrosilylationorcondensationcrosssslinking pelu silikoniadhesive,formingakemikalbondnetwork ti o wọ inu oju-ọna.Itosi yii le mu iwọn-giga-akoko26

2.RampedCuringandPost-TreatmenttoEliminateDefects

Arampedcuringprofaili ni iṣẹ: akọkọ, ojutu ti wa ni wiwakọ ati pe adhesivelayerisleveledat80–100°C; lẹhinna hydrosilylation ati ifipamọ ti MQresina ti pari ni150–170°C; nikẹhin, ifiweranṣẹ -curingiscarriedoutat200–220°Cforiforiwakati kuro ninu aapọn ati imuduro awọn aaye agbelebu ti ara.Ifẹ rọra ṣe idilọwọ awọn microcrackingduetodifferentialthermal isunki.

Alaye ti o wa loke ti pese nipasẹJiangsuAokaiNewMaterialTechnologyCo.,Ltd.

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