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通过对纳米碳酸钙(nano-CaCO3)表面处理及其对聚氯乙烯(PVC)、氯乙烯-丙烯酸丁酯共聚物(VC/BA)、nano-CaCO3三元复合体系加工工艺的考察,研制了PVC/(VC/BA)/nano-CaCO3复合材料,并对其力学性能进行了研究。结果表明:以nano-CaCO3与VC/BA共聚物先制成复合母粒,再与PVC进行共混的二次分散成型工艺,比传统的将三者直接进行共混的一次分散成型工艺更有利于纳米粒子在基体中的分散,所制材料的力学性能更优。当复合母粒中VC/BA与nano-CaCO3的比例为2∶3时,材料的力学性能最佳,nano-CaCO3和VC/BA能协同增韧PVC,并且nano-CaCO3对材料具有补强作用,使材料在强度保持基本不变的情况下冲击性能得到大幅度提高,当PVC和复合母粒质量比为100∶20时,材料的冲击强度达到49.5kJ/m,是纯PVC(PVC的冲击强度为4.9kJ/m)的10倍,拉伸强度仍高达51.0MPa。
Through the surface treatment of nano-CaCO3 and its processing of PVC, VC / BA and nano-CaCO3 ternary composite system, PVC / (VC / BA) / nano-CaCO3 composites, and its mechanical properties were studied. The results showed that the second dispersion molding process of composite masterbatch with nano-CaCO3 and VC / BA copolymer and then with PVC was more effective than the traditional one-time dispersion molding process which blended the three directly Conducive to the dispersion of nanoparticles in the matrix, the mechanical properties of the material made of better. When the ratio of VC / BA to nano-CaCO3 in the composite masterbatch is 2: 3, the mechanical properties of the composites are best, nano-CaCO3 and VC / BA can toughen PVC, and nano-CaCO3 can reinforce the material , So that the impact strength of the material is substantially unchanged in the case of substantially improved, when the mass ratio of PVC and composite masterbatch of 100: 20, the impact strength of the material reached 49.5kJ / m, is pure PVC (PVC impact Strength of 4.9kJ / m) 10 times, the tensile strength is still as high as 51.0MPa.