采用浮化法由芳香添加剂与高软化点沥青混合物制备了沥青球.通过热重差热分析研究了不同沥青种类、不同添加剂/高软化点沥青比例和不同结构的沥青球在空气中的氧化稳定化行为.结果表明:芳香添加剂可以大大降低成球沥青的软化点,促进氧化稳定化;与煤沥青球相比,石油沥青球更易氧化,但氧化的沥青球表面成为双扩散的障碍,从而抑制沥青球的氧化稳定化;增加芳香添加剂含量,使沥青球氧化反应易于进行.
Oxidation-stabilized pitch spheres were prepared from pitch spheres, which were obtained by emulsifying spheroidizing mixtures of aromatic additive, such as naphthalene, and high soft-point pitch from coal and petroleum. Thermogravimetric analysis, differential gravimetric and differential scanning calorimetric analysis were employed to investigate the stabilization behavior of pitch spheres in air in relation to the type of pitch, ratios of aromatic additive to high soft-point pitch, and structures of pitch spheres. It is found that an aromatic additive can greatly reduce the softening point of pitch and promote stabilization. Petroleum pitch based spheres are more liable to oxidation compared to coal tar pitch based ones. The oxidized surface of pitch spheres acts as a diffusion barrier that inhibits the oxidation stabilization, which is alleviated by increasing the amount of aromatic additive.
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