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在考察聚氯乙烯/聚氨酯/纳米碳酸钙(PVC/PU/nano-CaCO3)反应挤出工艺的基础上,结合PU的反应特点,将表面处理的nano-CaCO3利用超声辐照技术并经搅拌分散于L-MDI中,采用反应挤出一步法制备了PU/nano-CaCO3共同增强增韧的PVC复合材料,并对其力学性能进行了研究。结果表明:PU/nano-CaCO3的质量配比为4∶1时,增韧效果最佳,PU和nano-CaCO3能协同增韧PVC,且nano-CaCO3具有增强作用,当PVC/PU/nano-CaCO3质量比为100∶20∶5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,增强增韧PVC效果显著。
Based on the investigation of the PVC / PU / nano-CaCO3 reaction extrusion process, combined with the reaction characteristics of PU, the surface-treated nano-CaCO3 was dispersed by stirring using ultrasonic irradiation In L-MDI, PU / nano-CaCO3 co-reinforced toughened PVC composites were prepared by one step reaction and the mechanical properties were studied. The results show that toughening effect is best when PU / nano-CaCO3 mass ratio is 4:1, PU and nano-CaCO3 can toughen PVC, and nano-CaCO3 has reinforcing effect. When PVC / PU / nano- When the mass ratio of CaCO3 is 100: 20: 5, the material has the best comprehensive performance, the impact strength reaches 58.3 kJ / m2, the tensile strength is 51.5 MPa, and the toughening effect of PVC is remarkable.