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在考察了聚氨酯-纳米碳酸钙/聚氯乙烯(PU-nano-CaCO3/PVC)反应挤出工艺的基础上,结合PU的反应特点,将经硬脂酸表面处理的nano-CaCO3利用超声辐照技术并经搅拌分散于液化4,4-二苯基甲烷二异氰酸酯(L-MDI)中,采用反应挤出一步法工艺制备了PU-nano-CaCO3/PVC复合材料,并对其力学性能进行了研究。结果表明,PU与nano-CaCO3的质量配比为4∶1时,对PVC的增韧效果最佳,PU与nano-CaCO3能协同增韧PVC,且nano-CaCO3具有补强作用。当PU/nano-CaCO3/PVC质量比为20∶5∶75时,材料的综合性能最优,冲击强度达到58.3 kJ/m2,拉伸强度为51.5 MPa。
Based on the investigation of PU-nano-CaCO3 / PVC reaction extrusion process and the reaction characteristics of PU, the nano-CaCO3 surface-treated with stearic acid was irradiated by ultrasonic Technology and dispersed in liquefied 4,4-diphenylmethane diisocyanate (L-MDI) by stirring, the PU-nano-CaCO3 / PVC composites were prepared by one-step reaction extrusion process and their mechanical properties were studied the study. The results showed that the toughening effect of PVC and PU was the best when the mass ratio of PU to nano-CaCO3 was 4:1. PU and nano-CaCO3 could toughen PVC, and nano-CaCO3 had reinforcing effect. When the mass ratio of PU / nano-CaCO3 / PVC is 20:5:75, the material has the best comprehensive properties, the impact strength is 58.3 kJ / m2 and the tensile strength is 51.5 MPa.