2压敏胶原理

Identification&ConverterSystemsDivision压敏胶的作用原理与技术PressureSensitiveAdhesiveTechnology不乾胶的定义DefinitionofPSA拥有持久的高黏度Aggressivelyandpermanentlytacky应用时只需用手或手指施压Adhereswithfingerorhandpressure不需水,溶剂或加热过程Requiresnoactivationbywater,solventorheat有牢靠的粘黏力Exertsastrongholdingforce有足够的内聚力和弹性HassufficientcohesivenessandelasticityPressureSensitiveTapeCouncil不干胶的好处AdvantagesofPSA抯不须涂布，混合等预处理步骤Readytouse,nomixingorbrushingisrequired一贯性的胶量Consistentamountofadhesive使用上方便，快捷Lessmessythansuperglueandcontactcement可以模切成各种形状Canbediecutintospecificshapes持久的黏弹性可以避免脆化，断裂等现象Staysviscoelasticwhicheliminatesbrittlefracturepossiblewithepoxies,hotmeltsandcyanoacrylates无臭，无味和溶剂Lessodorduringuse粘黏力和内聚力AdhesionandCohesion内聚力Cohesion材料自身的力量InternalstrengthofmaterialAdhesiveSubstrateSubstrateAdhesiveSubstrateSubstrate粘黏力Adhesion存在两种表面之间的力量Forcebetweendissimilarsurfaces黏性与剪力ViscosityandShearStrength低黏性材料LowViscousMaterials(e.g.Water水)–高流动性Floweasily–不须施加压力Donotneedrubdownpressure–无剪力Noshearstrength高黏性材料HigherViscousMaterials(e.g.Oil,Honey油,蜂蜜)–只需少许压力便可以流动Requiremoderatepressuretoflow–低剪力Littleshearstrength–无法持久承受荷重Failundercontinuousshearload黏性与剪力ViscosityandShearStrength黏弹性材料Visco-elasticMaterials(e.g.PressureSensitiveAdhesive不乾胶)–使用时须施加压力Requireconsiderablerub-downpressure–需驻留时间发挥效能Requiredwelltime–有优良的剪力Wellbalancedshearproperties非黏性材料Non-viscousMaterials(e.g.curedadhesives作用后的粘黏剂)–无流动性Noflowcharacteristics–无黏性Notsticky–有极高的剪力Maximumshearstrength黏性和黏弹性ViscosityandVisco-elasticityMaximumMaximum粘黏性AdhesionProperties内聚力特性CohesionProperties软Soft韧Firm不乾胶PressureSensitiveAdhesives黏性Viscous黏弹性Visco-elastic弹性Elastic固体状Solid不乾胶的运作原理HowPSABonds?不乾胶具有流动性,能与背材紧密接合AdhesivemustFLOWtoCONTACTsubstrate不乾胶与背材间的相互作用Adhesive-SubstrateINTERACTION初期与最终粘黏力InitialandUltimateAdhesion初期粘黏力无驻留时间InitialAdhesionNoDwellTime最终粘黏力驻留时间:UltimateAdhesion72小时/70癈软性与韧性的不乾胶SoftandFirmAdhesives韧性不乾胶FirmAdhesive–较小的初期接触面积Lessimmediatecontact–较低的初期粘黏力Lowinitialbondstrength–须较长的驻留时间Requireslongerdwelltime软性不乾胶SoftAdhesive–良好的初期接触面积Goodimmediatecontact–较高的初期粘黏力Highinitialbondstrength–较短或不须驻留时间Needslittleornodwelltime软性与韧性的不乾胶SoftandFirmAdhesives驻留时间DwellTime软性胶Soft韧性胶FirmAdhesionLevel粘黏力如何取得最大的接触面积MaximisationofContactArea时间Time–胶需要时间流动Foradhesivetoflow温度Temperature–高温可以减低胶的黏性Decreaseadhesiveviscosity–促进胶的流动性Acceleratesadhesiveflow–促进胶的Improvewetting压力Pressure–促进胶的流动性Acceleratesadhesiveflow–促进胶的Improvessurfacewetting–避免汽泡的产生Eliminatestrappedair压力表面能SurfaceEnergy高表面能HighSurfaceEnergy容易黏接Easy-to-adhere金属Metals聚碳Polycarbonate聚酯Polyester聚氯乙烯PVC聚氨Polyurethane丙烯酸AcrylicPolyvinylAcetate聚乙烯Polyethylene聚苯Polystyrene聚丙烯Polypropylene聚氟Teflon低表面能LowSurfaceEnergy难以黏接Hard-to-adhere表面结构与不乾胶的厚薄度SurfaceTexture粗糙的表面TexturedSurface薄ThinAdhesive有限度的接触LimitedContact厚ThickAdhesive最大接触面积MaximumContact不乾胶的化学构成PressureSensitiveAdhesive橡胶类RubberAdhesives–天然胶NaturalRubber–人造胶SyntheticRubber丙烯酸类AcrylicAdhesives–纯丙烯酸类StandardAcrylic–改良丙烯酸类ModifiedAcrylic矽胶类SiliconeElastomerAdhesives各种不干胶TypesofPSAsAdvantagesDisadvantagesRubberIndoorEffective“WETTING”propertiesHighinitialbondstrengthGoodadhesiontovarioussubstratesLowcostLimitedtemperatureperformance(-20to200F)PoorerdurabilityPoorerchemicalandU.V.resistanceAcrylic(Tackified)Indoor&OutdoorExcellentdurabilityBroadperformancetemperaturerange(-40to350F)Excellentchemical&UVresistanceLimited“WETTING”characteristicsLowerinitialbondstrengthLimitedtoHSEmaterialsAcrylic(Non-tackified)Indoor&OutdoorSignificantlyimproved“WETTING”propertiesExcellentbondtoLSEplasticsGoodagingcharacteristicsFillsgapbetweenAcrylicandRubberadhesivesLimitedchemicalandU.V.resistanceLimitedtemperatureperformance(-40to250F)SiliconeIndoor&OutdoorBroadtemperatureperformance(-100to500F)ExcellentDurabilityHighcostRubbervsAcrylicAdhesivesBondBuildUp驻留时间DwellTime橡胶类Rubber丙烯酸类AcrylicAdhesionLevel粘黏力丙烯酸胶的化学AcrylicAdhesiveChemistry交连结构CrosslinkingTackificationVariouspolymerbackbonesNocrosslinkingHighlycrosslinkedIncreasingCrosslinking:•Improvestemperatureresistance•Providesshortdwellrepositionabilityonplastics•Increasessolventresistance•ImprovesdiecuttingandhandlingCrosslinkingTiepolymerstrandstogetherNotackifierMaximumtackifierIncreasingTackifier:•Increasesadhesion•Decreasestemperatureresistance•Decreasessolventresistance•Increasessoftness/oozingTackificationAddingresinstoincreasetheadhesiontolowsurfaceenergymaterialsStaticShearArea:0.5?X1?Load:1,000g@[e-mail]#200#220#100#4009502,9505#200MP1,0006,00010,000+204,00010,000+IncreasedCrosslinkingIncreasedCrosslinkingCrosslinkingvsShear#310#300#350#300LSE1,0001,0002,500+10102,500+StaticShearArea:0.5?X1?Load:1,000g@[e-mail]3330-90degree,72hourroomtempdwell*Typicalvalues-notforspecificationpurposesAdhesiveStainlessABSPolypropylene(2mil)Steel#100927313#200MP1035722#350636139#300LSE737270#300728352AdhesivePeelPerformance粘接不牢的各种因素WhatCausesBondFailure?不乾胶与背材的相互作用Adhesive-SubstrateIncompatibilty表面结构TexturedSurface表面污染SurfaceContamination