Antioxidant D, Bht, Standard Material And Rubber Thermal Oxidative Aging Research

N-phenyl-6-naphthylamine(antioxidant D) and 2,6-Di-tert-butyl-P-cresol(ant-ioxidant BHT) are the two kinds of antioxidant which are extensively used in our country. Their standard reference materials can be used to rectify instruments and measure our analytical methods.This paper is mainly concerned about how to purify the industrial products of the antioxidant D and BHT and how to determine their purities. Besides this, it also studies the effects of industrial and purified antioxidant D in natural rubber. In order to attain this request, the recrystalizing method is used to purify antioxidant D and two methods of recrystalization and decompressed distillation are used to purify antioxidant BHT. After purification, the methods of high performance liquid chromatography(HPLC) differential scanning calorimetry(DSC) are used to determine their purities; At the same time an apparatus of zone melting is designed and its effected factors are discussed for the future purification of antioxidant D and BHT.The proper conditions of purification and determination are settled down through experiments and analysis. In addition to this the performance of resistance to hot-oxygen ageing of NR is obviously improved with the antioxidant D purity increasing.