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选择球状的碳酸钙、片状的滑石粉和针状的碱式硫酸镁晶须,等质量比复合与弹性体MBS共混后一起加入到硬质PVC中,分别采用一步法和二步法制得了PVC/MBS/多种无机物的复合材料,研究了其力学性能、加工流变性能和耐热性能。结果表明,球状/针状复合的CaCO3/Mg晶须改性体系所得共混物的缺口冲击强度和断裂伸长率最高,二步法加工可使材料缺口冲击强度上升为纯PVC的4倍左右,但一步法加工所得共混物的弯曲模量高于二步法。二步法加工的最大扭矩和平衡扭矩均比一步法小,出现降解、交联的时间较一步法迟;但二步法加工时熔融塑化时间较一步法长。
Select spherical calcium carbonate, flaky talc and acicular magnesium sulfate whisker, and other quality than the composite and elastomer MBS blend together after adding to the rigid PVC, respectively, by one-step and two-step method was PVC / MBS / a variety of inorganic composites, its mechanical properties, processing rheological properties and heat resistance. The results show that the notched impact strength and elongation at break of the blend prepared by spherical / needle-shaped CaCO3 / Mg whisker modified system are the highest, and the two-step processing can increase the notched impact strength of the material to about 4 times that of pure PVC However, the flexural modulus of blends obtained by one-step processing is higher than that of two-step method. Two-step method of processing the maximum torque and balance torque are smaller than the one-step method, there degradation, cross-linking time is slower than the one-step method; but two-step processing melting plasticization time longer than a step.