摘要
通过改变挤出机的螺杆结构、螺杆转速及挤出温度,研究了熔融挤出过程中剪切强度对超高黏度增强聚丙烯(PP)材料力学性能的影响。研究结果表明:当混炼段螺杆的分散混合能力减弱,且当螺杆转速较低时,熔体受到的机械剪切应力较小,在挤出过程中有效地减少了玻璃纤维的断裂,使其平均长度较长,拉伸强度提高了3.6%,弯曲强度提高了4.1%,冲击强度提高了22.2%,材料的力学性能提高。
Based on the change of the extruder screw structure,the screw rotation speed and extrusion temperature,the influence of changing shear strength on mechanical property of ultra high viscosity PP resin was studied in the process of melt extrusion.The results showed that when the disperse mixing capacity of mixing section of the screw became weakened,and the screw rotation speed became lower,the mechanical shearing stress on melt became smaller.Reduced the fracture of the fiberglass effectively in the process of melt extrusion and increased the average length of glass fiber,which made the tensile strength increased by 3.6%,the bending strength increased by 4.1%,the impact strength increased by 22.2%,the mechanical properties of the materials better.
出处
《上海塑料》
2017年第4期37-41,共5页
Shanghai Plastics
关键词
聚丙烯
玻璃纤维
平均长度
螺杆结构
螺杆转速
polypropylene
glass f iber
average le n g th
screw s t ru c tu re
screw ro ta tio n speed
