valox4521pbt高流动性阻燃pbt沙伯基础
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(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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VALOX 4521 PBT高流动性阻燃PBT 沙伯基础