不干胶的动作原理

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,不乾胶的定义,Definition of PSA,拥有持久的高黏度,Aggressively and permanently tacky,应用时只需用手或手指施压,Adheres with finger or hand pressure,不需水,溶剂或加热过程,Requires no activation by water,solvent or heat,有牢靠的粘黏力,Exerts a strong holding force,有足够的内聚力和弹性,Has sufficient cohesiveness and elasticity,Pressure Sensitive Tape Council,不干胶的好处,Advantages ofPSA抯,不须涂布，混合,等,等预处理步骤,Ready to use,no mixing or brushingis required,一贯性的胶量,Consistent amount ofadhesive,使用上方便，快,捷,捷,Less messy than superglue and contact cement,可以模切成各种,形,形状,Can bedie cutinto specificshapes,持久的黏弹性可,以,以避免脆化，断,裂,裂等现象,Stays viscoelastic which eliminatesbrittle fracture possiblewith epoxies,hot melts andcyanoacrylates,无臭，无味和溶,剂,剂,Less odor during use,粘黏力和内聚力,Adhesion and Cohesion,内聚力Cohesion,材料自身的力量Internal strength of material,Adhesive,Substrate,Substrate,Adhesive,Substrate,Substrate,粘黏力Adhesion,存在两种表面之,间,间的力量Force betweendissimilar surfaces,黏性与剪力,Viscosity andShear Strength,低黏性材料Low Viscous Materials,(e.g.Water 水),高流动性Flow easily,不须施加压力Do notneed rub downpressure,无剪力Noshear strength,高黏性材料Higher ViscousMaterials,(e.g.Oil,Honey 油,蜂,蜜,蜜),只需少许压力便,可,可以流动Require moderatepressure to flow,低剪力Little shear strength,无法持久承受荷,重,重Failunder continuous shear load,黏性与剪力,Viscosity andShear Strength,黏弹性材料Visco-elastic Materials,(e.g.PressureSensitive Adhesive 不,乾,乾胶),使用时须施加压,力,力Require considerable rub-down pressure,需驻留时间发挥,效,效能Require dwell time,有优良的剪力Well balancedshear properties,非黏性材料Non-viscous Materials,(e.g.cured adhesives,作,作用后的粘黏,剂,剂),无流动性Noflow characteristics,无黏性Notsticky,有极高的剪力Maximumshearstrength,黏性和黏弹性,Viscosity andVisco-elasticity,粘黏 性,Adhesion Properties,内 聚 力 特,性,性,Cohesion Properties,软,Soft,韧,Firm,不 乾 胶,Pressure Sensitive,Adhesives,黏 性,Viscous,黏 弹 性,Visco-elastic,弹性,Elastic,固 体 状,Solid,不 乾 胶 的,运,运 作 原理,How PSABonds?,不 乾 胶,具,具 有 流 动,性,性,能,与,与 背 材 紧,密,密 接 合Adhesive must,FLOW,to,CONTACT,substrate,不乾胶与背材间,的,的相互作用Adhesive-Substrate,INTERACTION,初 期 与 最,终,终 粘 黏,力,力,Initialand UltimateAdhesion,初 期 粘 黏,力,力,无 驻 留 时,间,间,InitialAdhesion,No Dwell Time,最 终 粘 黏,力,力,驻 留 时 间:,Ultimate Adhesion,72 小 时/70 癈,软 性 与 韧,性,性 的 不,乾,乾 胶,Soft and FirmAdhesives,韧性不乾胶,Firm Adhesive,较小的初期接触,面,面积,Less immediatecontact,较低的初期粘黏,力,力,Low initial bond strength,须较长的驻留时,间,间,Requires longer dwelltime,软性不乾胶,Soft Adhesive,良好的初期接触,面,面积,Good immediatecontact,较高的初期粘黏,力,力,High initial bond strength,较短或不须驻留,时,时间,Needs little or no dwell time,软 性 与 韧,性,性 的 不,乾,乾 胶,Soft and FirmAdhesives,驻留时间,Dwell Time,Adhesion Level,粘黏力,软性胶Soft,韧性胶Firm,如 何 取 得,最,最 大 的,接,接 触 面 积,Maximisation of Contact Area,时 间 Time,胶需要时间流动,For adhesive to flow,温 度Temperature,高温可以减低胶,的,的黏性,Decrease adhesive viscosity,促进胶的流动性,Accelerates adhesiveflow,促进胶的,Improvewetting,压 力Pressure,促进胶的流动性,Accelerates adhesiveflow,促进胶的,Improves surface wetting,避免汽泡的产生,Eliminates trapped air,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Acrylic,Polyvinyl Acetate,聚乙烯 Polyethylene,聚苯 Polystyrene,聚丙烯 Polypropylene,聚氟Teflon,低表面能Low Surface Energy,难以黏接Hard-to-adhere,表 面 结 构,与,与不乾胶的厚薄,度,度,SurfaceTexture,粗 糙 的 表,面,面,Textured Surface,薄,Thin Adhesive,有限度的接触,LimitedContact,厚,Thick Adhesive,最大接触面积,MaximumContact,不乾胶的化学构,成,成,Pressure Sensitive Adhesive,橡胶类 Rubber Adhesives,天然胶 Natural Rubber,人造胶 SyntheticRubber,丙烯酸类 Acrylic Adhesives,纯丙烯酸类 StandardAcrylic,改良丙烯酸类Modified Acrylic,矽胶类Silicone Elastomer Adhesives,Rubber,vs,AcrylicAdhesives Bond BuildUp,驻留时间Dwell Time,丙 烯 酸 类,Acrylic,Adhesion Level,粘黏力,Rubber,vs,AcrylicAdhesives Bond BuildUp,驻留时间Dwell Time,丙 烯 酸 类,Acrylic,Adhesion Level,粘黏力,橡胶类Rubber,丙烯酸胶的化学,AcrylicAdhesive Chemistry,交连结构 Crosslinking,增粘处理 Tackification,不同的聚合物基,体,体,Variouspolymer backbones,No crosslinking,Highly crosslinked,Increasing Crosslinking:,Improves temperatureresistance,Provides shortdwellrepositionability onplastics,Increases solvent resistance,Improves die cuttingand handling,Crosslinking,Tie polymer strands together,No tackifier,Maximum tackifier,Increasing Tackifier:,Increases adhesion,Decreases temperatureresistance,Decreases solvent resistance,Increases softness/oozing,Tackification,Addingresinsto increase the adhesion tolow surface energy materials,StaticShearArea:0.5?X 1?Load:1,000g roomtemp.,500g 158 deg.F,Crosslinking vs Shear,#200#220#100,#4009502,9505#200MP,1,0006,00010,000+,204,00010,000+,Increased Crosslinking,Increased Crosslinking,Crosslinking vs Shear,#310#300#350,#300LSE,1,0001,0002,500+,10102,500+,StaticShearArea:0.5?X1?Load:1,000groom temp.,500g 158 deg.F,ASTM D3330-90degree,72hour roomtempdwell,*Typicalvalues-not forspecification purposes,AdhesiveStainlessABSPolypropylene,(2mil)Steel,#100927313,#200MP1035722,#350636139,#300LSE737270,#300728352,AdhesivePeel Performance,粘接不,牢,牢的各,种,种因素,What CausesBond Failure?,不乾胶,与,与背材,的,的相互,作,作用,Adhesive-SubstrateIncompatibilty,表面结,构,构,TexturedSurface,表面污,染,染,Surface Contamination,离型剂,Mold Release,尘埃Dust Particles,增塑剂,的,的迁移,PlasticiserMigration,软质聚,氯,氯乙烯FlexiblePVC,橡胶Rubber,残留水,份,份,Outgas