PP Ferro TPP20AJ34NA

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PP属于结晶型聚合物，不到一定温度其颗粒不会熔融，不像PE或PVC那样在加热过程中随着温度提高而软化。一旦达到某一温度，PP颗粒迅速融化，在几度范围内就可全部转化为熔融状态。PP的熔体粘度比较低，因此成型加工流动性良好，特别是当熔体流动速率较高时熔体粘度更小，适合于大型薄壁制品注塑成型，例如洗衣机内桶。PP属于非极性聚合物，具有良好的电绝缘性，且PP吸水性极低，电绝缘性不会受到湿度的影响。PP的介电常数、介质损耗因数都很小，不受频率及温度的影响。PP的介电强度很高，且随温度上升而增大。这些都是在湿、热环境下对电气绝缘材料有利的。另一方面PP的表面电阻很高，在一些场合使用必须先进行抗静电处理。PP是高结晶塑料，它在熔点的附近时，它的液态和固态的体积相差很大，加上它收缩时的各向异性，因此易引起不均衡收缩即缩水；因此，设计制品时，尽量避免壁厚不均匀；聚丙烯的熔体粘度小，流动性好，流长比流动长度与厚度的比值大，薄壁制品可能也能注满；但同时，它的模具制作时，精度要高，否则会批峰；因它的各向异性，制品经常是变形。收缩率为18‰；溢边值为0.03mm。聚丙烯不吸水，一般不需烘干，有时为了产品质量，也可以用60℃的温度，烘干30分钟至1个小时，以排出原料中的浮水。







聚丙烯(PP塑料)是继尼龙之后发展的又一优良树脂品种，它是一种高密度、无侧链、高结晶必的线性聚合物，具有优良的综合性能。未着色时呈白色半透明，蜡状；比聚乙烯轻。透明度也较聚乙烯好，比聚乙烯刚硬。
  

2、聚丙烯(PP塑料)特性  
 PP 聚丙烯化学和物理特性 PP是一种半结晶性材料。它比PE要更坚硬并且有更高的熔点。 由于均聚物型的PP温度高于0C以上时非常脆，因此许多商业的PP材料是加入1~4%乙烯的无规则共聚物或更高比率乙烯含量的钳段式共聚物。共聚物型的PP材料有较低的热扭曲温度（100C）、低透明度、低光泽度、低刚性，但是有有更强的抗冲击强度。PP的强度随着乙烯含量的增加而增大。 PP的维卡软化温度为150C。由于结晶度较高，这种材料的表面刚度和抗划痕特性很好。
PP不存在环境应力开裂问题。通常，采用加入玻璃纤维、金属添加剂或热塑橡胶的方法对PP进行改性。PP的流动率MFR范围在1~40。低MFR的PP材料抗冲击特性较好但延展强度较低。对于相同MFR的材料，共聚物型的强度比均聚物型的要高。 由于结晶，PP的收缩率相当高，一般为1.8~2.5%。并且收缩率的方向均匀性比PE-HD等材料要好得多。加入30%的玻璃添加剂可以使收缩率降到0.7%。 均聚物型和共聚物型的PP材料都具有优良的抗吸湿性、抗酸碱腐蚀性、抗溶解性。然而，它对芳香烃（如苯）溶剂、氯化烃（四氯化碳）溶剂等没有抵抗力。
   

3、聚丙烯(PP塑料)成型性能
（1）结晶料，吸湿性小，易发生融体破裂，长期与热金属接触易分解.
（2）流动性好，但收缩范围及收缩值大，易发生缩孔.凹痕，变形.
（3）冷却速度快，浇注系统及冷却系统应缓慢散热，并注意控制成型温度.料温低方向方向性明显.低温高压时尤其明显，模具温度低于50度时，塑件不光滑，易产生熔接不良，留痕，90度以上易发生翘曲变形 
（4）塑料壁厚须均匀，避免缺胶，尖角，以防应力集中. 


特定条件下容易分解
常见制品：盆、桶、家具、薄膜、编织袋、瓶盖、汽车保险杠等。
聚丙烯也包括丙烯与少量乙烯的共聚物在内。PP粒料为本色、圆柱状颗粒，颗粒光洁，粒子的尺寸在任意方向上为2mm～5mm，无臭无毒，无机械杂质。该品以高纯度丙烯为主要原料，乙烯为共聚单体，采用高活性催化剂在62℃～80℃及低于4.0MPa的压力下经气相反应生产聚丙烯粉料，再经干燥、混炼、挤压、造粒、筛分、均化成聚丙烯颗粒。密度为0.90 g/cm3～0.91g/cm3，是通用塑料中最轻的一种。聚丙烯树脂具有优良的机械性能和耐热性能，使用温度范围-30℃～140℃。同时具有优良的电绝缘性能和化学稳定性，几乎不吸水，与绝大多数化学品接触不发生作用。该品耐腐蚀，抗张强度30MPa，强度、刚性和透明性都比聚乙烯好；缺点是耐低温冲击性差，较易老化，但可分别通过改性和添加抗氧剂予以克服。与发烟硫酸、发烟硝酸、铬酸溶液、卤素、苯、四氯化碳、氯仿等接触有腐蚀作用。可用作工程塑料，适用于制电视机、收音机外壳、电器绝缘材料、防腐管道、板材、贮槽等，也用于生产扁丝、纤维、包装薄膜等

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