超轻高强聚丙烯/碳酸钙线材研究  

Properties Study of Ultra-low Density and High-strength Polypropylene/CaCO_3 Wires

作　　者：刘科 刘义[1] 曾佳[1] 吴世见[1] LIU Ke;LIU Yi;ZENG Jia;WU Shi-jian(College of Polymer Science and Engineering,Sichuan University,Chengdu 610000,China)

机构地区：[1]四川大学高分子科学与工程学院,四川成都610000

出　　处：《塑料工业》2019年第2期48-51,共4页China Plastics Industry

摘　　要：采用口模拉伸技术成功连续制备了超轻高强聚丙烯/碳酸钙(PP/CaCO_3)复合线材。由于复合引入的CaCO_3,线材在130℃下其热收缩只有4. 5%(而纯PP的为8%),热尺寸稳定性大幅度提高。利用SEM对线材的亚微观形貌观察发现,沿拉伸方向大量CaCO_3颗粒两旁存在明显线状空穴,PP球晶形变、取向,形成纤维状结构。经DSC进一步分析表明,提高实际拉伸比,线材的结晶更趋完善。这种高取向的微纤结构线材,拉伸强度可达450MPa,而其密度只有纯PP的90%,低至0. 83 g/cm^3。The polypropylene(PP)/calcium carbonate(CaCO3)composite wires with ultra-low density and high-strength were successfully and continuously prepared by die-drawing.Due to the composite introduction of CaCO3 ,the thermal shrinkage of the prepared wires at 130 ℃ could achieve 4.5%,which was lower than pure PP wires(8%)and the thermal dimensional stability of the wires were greatly improved.Submicroscopic morphology of the composite wires were observed by scanning electron microscope(SEM).And the graph showed that there were obvious linear pores around the CaCO3 particles along the stretching direction,and the PP spheroids were deformed and oriented to form a fibrous structure.Further analysis by differential scanning calorimetry(DSC)show that the improvement of the actual draw ratio could obtain more perfect crystallization wires.For this kind of microfiber structure wire with high orientation, the tensile strength could achieve 450 MPa and the density could reach 0.83 g/cm^3 which are only 90%of the pure PP wires.

关 键 词：聚丙烯 口模拉伸 空穴化 高强度 微纤 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]