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PP板材的雷电竞app下载性能

作者:奥凯高分子  发布时间:2017-09-21 16:19  点击量:

  PP板材是一种半结晶性材料,它比PE要更坚硬并且有更高的熔点,应用于耐酸碱设备,环保设备,废水、废气排放设备用,洗涤塔,无尘室,半导体厂及其相关工业之设备,也是制造塑料水箱的首选材料,其中PP厚板材广泛用于冲压板,冲床垫板等。

  玻纤增强PP板:通过20%被玻纤增强后,除保持原有的优良性能外,强度,刚性等均较PP提高一倍,而且具有良好的耐热性,低温冲击性,防腐耐电弧性,低收缩率。特别适用于化纤、氯碱、石油、染料、农药、食品、医药、轻工、冶金、污水处理等领域。

  由于均聚物型的PP温度高于0℃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(100℃)、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150℃。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。PP也不象PE那样在高温下仍具有抗氧化性。

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