阻燃高抗冲聚苯乙烯的溶剂法再生工艺研究

Recycling process of flame-retarded high impact polystyrene resin with solvent process

采用天然无毒柠檬烯作为高抗冲聚苯乙烯的溶剂、以低毒正丙醇作为沉淀剂,考察了影响高抗冲聚苯乙烯树脂沉淀颗粒形态的各种因素,探讨了高抗冲聚苯乙烯溶液的浓度、沉淀温度、搅拌速度等因素对沉淀过程的影响规律。实验结果表明,当聚苯乙烯质量分数为15%、沉淀剂用量为3倍HIPS溶液的体积,在40℃及2 000 r/min的搅拌作用下,能获得沉淀颗粒大小合适的再生聚苯乙烯产品,聚苯乙烯的回收率达到97%(质量分数),原料中近90%多溴联苯醚可同时被去除。

The natural non-toxic d-limonene and low toxic n-propanol are selected as the solvent and precipitant of HIPS resin, respectively. The influences of HIPS concentration, precipitating temperature, velocity of agitating on the precipitation behavior of HIPS are investigated. The results show that the HIPS precipitation can form the particles with suitable shape under the following conditions：about 15wt% of the HIPS concentration, 3：1 of the volume ratio of npropanol to HIPS solution,2 000 r/min of stirring speed and 40℃ of the precipitating temperature. The recovery rate of HIP can reach near 97wt%. And more than 90wt% of polybrorainated diphenyl ethers in the flame-retarded HIPS resin can be removed at the same time.