挤出工艺对纳米碳酸钙母料性能影响

Effects of Extrusion Process on Properties of Nano-CaCO3 Masterbatch

采用纳米碳酸钙(nano-CaCO3),分别以一字排列三螺杆挤出工艺与双转子连续混炼挤出工艺制备nano-CaCO3母料,然后添加到高密度聚乙烯(PE-HD)中制备PE-HD/nano-CaCO3复合材料。分析了不同挤出工艺对PE-HD/nano-CaCO3复合材料断面形貌和力学性能的影响。结果表明,一字排列三螺杆挤出工艺更好地改善了nano-CaCO3在PE-HD中的分散性,提高了PE-HD/nano-CaCO3复合材料的韧性,使其缺口冲击强度提高63.8%,对断裂伸长率影响较小,降低了16.4%;双转子连续混炼挤出工艺更好地改善了PE-HD/nano-CaCO3复合材料的弯曲性能,使其弯曲强度提高6.0%,弯曲弹性模量提高48.4%,对拉伸强度影响较小,降低了5.3%。

Nano-CaCO3 was used to prepare nano-CaCO3 masterbatch by the parallel arranged tri-screw extrusion process and the double rotor continuous mixing extrusion process respectively,then the high density polyethylene(PE-HD)/nano-CaCO3 composites were prepared by adding the nano-CaCO3 masterbatch in PE-HD.The effects of different process on the cross-sectional morphology and mechanical properties of PE-HD/nano-CaCO3 composite was analyzed.Experiment results show that,the parallel arranged tri-screw extrusion process better improves the dispersion of nano-CaCO3 in and the improves toughness of PE-HD/nano-CaCO3 composite,so as to improve the notched impact strength of 63.8%,it has less effect on the elongation at break,which is reduced by 16.4%.The double rotor continuous mixing extrusion process better improves the flexura properties of PE-HD/nano-CaCO3 composite,so that the flexural strength increases by 6%,flexural modulus increases 48.4%,it has less effect on the tensile strength,which is reduced by 5.3%.