SABICValox系列PBT简介
聚对苯二甲酸丁二醇酯,英文名polybutyleneterephthalate(简称PBT),属于聚酯系列,是由1.4-pbt丁二醇(1.4-Butyleneglycol)与对苯二甲酸(PTA)或者对苯二甲酸酯(DMT)聚缩合而成,并经由混炼程序制成的乳白色半透明到不透明、结晶型热塑性聚酯树脂。与PET一起统称为热塑性聚酯,或饱和聚酯。
PBT特性
1、机械性能:强度高、耐疲劳性、尺寸稳定、蠕变也小(高温条件下也极少有变化);
2、耐热老化性:增强后的UL温度指数达120~140℃(户外长期老化性也很好);
3、耐溶剂性:无应力开裂;
4、对水稳定性:PBT遇水易分解(高温、高湿环境下使用需谨慎);
5、绝缘性能:优良(潮湿、高温也能保持电性能稳定,是制造电子、电气零件的理想材料);
6、介电系数:3.0-3.2;
7、耐电弧性:120s
8、成型加工性:普通设备注塑或挤塑。由于结晶速度快,流动性好,模具温度也比其他工程塑料要求低。在加工薄壁制件时,仅需几秒钟,对大部件也只要40-60s即可。
PBT的应用
1、电子电器:连接器、开关零件、家用电器、配件零件、小型电动罩盖或(耐热性、阻燃性、电气绝缘性、成型加工性);
2、汽车:外装零件:主要有转角格珊、发动机放热孔罩等;内部零部件:主要有内镜撑条、刮水器支架和控制系统阀;
3、汽车电器零件:汽车点火线圈绞管和各种电器连接器等。
4、机械设备:视频磁带录音机的带式传动轴、电子计算机罩、水银灯罩、电熨斗罩、烘烤机零件以及大量的齿轮、凸轮、按钮、电子表外壳、照相机的零件(有耐热、阻燃要求)
PBT注塑工艺
干燥处理:这种材料在高温下很容易水解,因此加工前的干燥处理是很重要的。建议在空气中的干燥条件为120℃,6~8小时,或者150℃,2~4小时。湿度必须小于0.03%。如果用吸湿干燥器干燥,建议条件为150℃,2.5小时。[2]
熔化温度:225~275℃,建议温度:250℃。
模具温度:对于未增强型的材料为40~60℃。要很好地设计模具的冷却腔道以减小塑件的弯曲。热量的散失一定要快而均匀。建议模具冷却腔道的直径为12mm。
注射压力:中等(大到1500bar)。
注射速度:应使用尽可能快的注射速度(因为PBT的凝固很快)。
流道和浇口:建议使用圆形流道以增加压力的传递(经验公式:流道直径=塑件厚度+1.5mm)。可以使用各种型式的浇口。也可以使用热流道,但要注意防止材料的渗漏和降解。浇口直径应该在0.8~1.0*t之间,这里t是塑件厚度。如果是潜入式浇口,建议小直径为0.75mm。
SABICValox系列PBT介绍
Valox175Unreinforced,neatPBTresinforcompoundingonly.NaturalColorOnly.
Valox175HPUnreinforced,neatFDAcompliantPBTresinforcompoundingonly.
Valox176Unreinforced,neatPBTresinforfibers.NaturalColorOnly.
Valox176HPUnreinforced,FDAcompliantneatPBTresinforfibers.NaturalColorOnly.
Valox195Forcompoundingonly(notforinjectionmolding)UnreinforcedPBT.
Valox195HPForcompoundingonly(notforinjectionmolding)UnreinforcedPBT.
Valox215HPRUnreinforcedPBTwithmoldrelease.FDAfoodcontactcompliantinlimitedcolors.
Valox295UnreinforcedPBT;Meltviscosity900-1300poise.
Valox305PBT,Forcompoundingonly.NotintendedforInjectionMolding.
Valox308PBT,Forcompoundingonly.NotintendedforInjectionMolding.
Valox310Unreinforced,generalpurpose.Typicalviscosity5000-7000.
Valox310SE0Unreinforced,flameretardantPBT.V0-0.7mm.
Valox311Unreinforced,improvedresistancetoUV.Mediumviscosity.
Valox312Unreinforced,Forcompoundingonly(notforinjectionmolding).
Valox315Unreinforced,Forextrusion/compoundingonly(notforinjectionmolding).
Valox325Generalpurpose,unreinforced,improvedprocessing.
Valox337LowtemperatureimpactPBT.
Valox357PC/PBT,ImpactModifier,FlameRetardant
Valox357UUnreinforcedPBTP,UL94V-0/5VArated.ImprovedUVresistantversionofVALOX357.
Valox364Designedforoutdoortelecommunicationsenclosureapplications.
Valox365Unreinforced,opaque,provideschemicalresistanceanddimensionalstability.
Valox3706ImpactmodifiedPBT+PC.Outdoorenclosures.Notavailableinallcolors.
Valox4012G10%glassfiberreinforcedPBTwithexcellentmechanicalproperties.
Valox42030%GR,excellentstrength,stiffnessanddimensionalstability.Highheatresistance.
Valox420HP30%GlassfilledPBTresin,FDAFoodContactcompliantinlimitedcolors.
Valox420SE030%GR,UL94V-0/5Vrated.Numerousapplications.
Valox420SE0UPBT,30%GlassReinforced,FlameRetardantUL94V-0/5VArated,UV-Stabilized
Valox43033%glassreinforced,impactmodified.
Valox451E20%GR.EasyflowversionofVALOX451.
Valox4521PBT,GlassFiber,FlameRetardant,ULGrade
Valox4576.5%GRPBT,UL94V-0/5V.
Valox50830%GRPBT+PC.Excellentmechanicalandthermalperformance.
Valox508R30%GRPBT+PC.Excellentmechanicalandthermalperformance.
Valox55330%GRPBT+PC,UL94V-0.Reducedwarpagecharacteristics.Applications.
Valox553U30%GRPBT+PC,UL94V-0.Reducedwarpagecharacteristics.Applications.
Valox81515%GRPBT+PET,excellentsurfacefinish.
Valox815FPBT+PET,15%Glass,MoldRelease,HeatStabilized,ForFoodcontactapplications
Valox83030%GRPBTP,excellentsurfacefinish.
Valox830FPBT+PET,30%Glass,MoldRelease,HeatStabilized,Forfoodcontactapplications
Valox85515%GRPBTP,UL94V-0rated.Improvedsurfaceappearance.
Valox86530%GRPBTP,UL94V-0rated.Non-bloomingflameretardant.
ValoxCS81515%glassreinforcedPBT+PET.Improvedheatagedcolorstability,highsurfacegloss.
ValoxDR4817%glassreinforced,flameretardantgradeUL-94ratedV-0/5VA.
ValoxDR5115%GRpolyester,excellentmechanical,thermalandelectricalperformance.
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