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采用喷雾干燥方法得到丁苯橡胶 /纳米碳酸钙复合粉末橡胶 (RPS),探讨了RPS中苯甲酸钠用量以及丁苯橡胶与纳米碳酸钙质量比对聚丙烯 (PP)力学性能、耐热性和结晶性能的影响。结果表明,苯甲酸钠最佳用量为丁苯橡胶和纳米碳酸钙总用量的 10%;随着纳米碳酸钙用量的增加,体系中分散相粒径减小,结晶速率加快,材料的韧性、刚性和耐热性能提高。RPS对于不同熔体流动指数的PP具有不同的增韧增强效果。熔体流动指数越小,越有利于RPS在PP中的分散,体系韧性越高。此外,动态流变学研究表明,PP/RPS三元复合材料的熔体流变行为与纯PP类似,RPS的加入增加了PP的黏度,流动性能变差。
The styrene butadiene rubber / nano calcium carbonate composite powder rubber (RPS) was obtained by spray drying method. The effects of the amount of sodium benzoate and the mass ratio of styrene butadiene rubber to calcium carbonate on the mechanical properties, heat resistance and crystallization of polypropylene (PP) The impact of performance. The results showed that the best dosage of sodium benzoate was 10% of the total amount of SBR and nano-CaCO3. With the increase of the dosage of nano-CaCO3, the particle size of disperse phase decreased, the crystallization rate accelerated, the toughness and rigidity Heat resistance improves. RPS has different toughening enhancing effects on PP with different melt flow indices. The smaller the melt flow index, the more conducive to the dispersion of RPS in PP, the higher the system toughness. In addition, the dynamic rheological studies have shown that the melt rheological behavior of PP / RPS ternary composites is similar to that of pure PP. The addition of RPS increases the viscosity of PP and the flowability deteriorates.