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以3,5-二叔丁基-4-羟基苯甲酸和十二硫醇为原料,采用酯化反应,合成了抗氧剂3,5-二叔丁基-4-羟基苯甲酸十二硫酯(DMB)分子内复合抗氧剂,并通过红外光谱和核磁共振谱对其进行结构表征。同时,制备了抗氧剂DMB和聚丙烯的共混体系,通过差热扫描量热法和烘箱老化试验评价了DMB对聚丙烯树脂的热氧化降解行为。差热扫描量热法结果表明DMB能明显提高PP的耐热氧老化性能。烘箱老化研究显示,PP-DMB试样的拉伸强度和冲击强度在老化5~6d内保持率很好,6d后,迅速下降。熔体流动速率研究表明,PP-DMB试样在烘箱老化5d后,其熔体流动速率开始上升。
Using 3,5-di-tert-butyl-4-hydroxybenzoic acid and dodecanethiol as raw materials, an antioxidant 3,5-di-tert-butyl-4-hydroxybenzoic acid Ester (DMB) intramolecular compound antioxidant, and its structural characterization by infrared spectroscopy and nuclear magnetic resonance spectroscopy. At the same time, blends of DMB and polypropylene were prepared. The thermal oxidative degradation of polypropylene resin by DMB was evaluated by differential scanning calorimetry and oven aging test. Differential scanning calorimetry results show that DMB can significantly improve the thermal aging resistance of PP. Oven aging studies have shown that the tensile strength and impact strength of PP-DMB samples in the aging of 5 ~ 6d retention rate is very good, after 6d, decreased rapidly. Melt flow rate studies have shown that the melt flow rate of PP-DMB samples began to rise after 5 days of oven aging.