热聚合-氧化法制备高β树脂改性沥青

摘要

Refined pitch with low content of quinoline insoluble (QI<0.1%) was obtained by solvent extraction from medium pitch as the raw material. The modified pitch with high content ofβ resin was obtained by thermal polymerization and air oxidation under certain conditions. The factors affecting the modification such as the reaction temperature,oxidation time and the air flow during the process of air-oxidation were discussed in this paper. The experimental results show that,with the oxidation temperature of 280℃,oxidation time of 2h,and the air flow rate of 0.04m³/h,we can obtain high quality modified coal tar pitch with softening point of 220℃,toluene-insoluble of 61.59%, quinolone-insoluble of 4.35%,coking value of 78.44%,andβ resin content of 57.24%.%以中温沥青为原料，通过溶剂萃取沉降分离获得低喹啉不溶物含量（QI＜0.1%）的精制沥青。对精制沥青进行热聚合-空气氧化改性处理，得到高β树脂含量的改性沥青。经特定热聚合条件处理后，研究了空气氧化阶段的反应温度、氧化时间和空气流量对沥青改性的影响。实验结果表明，在空气氧化阶段，当氧化温度为280℃，氧化时间为2h，空气流量为0.04m³/h时，可以获得软化点为220℃、甲苯不溶物为61.59%、喹啉不溶物为4.35%、结焦值为78.44%，β树脂含量为57.24%的优质改性沥青。