加热移除废弃聚氨酯硬泡中CFC-11的研究

Studies on removing CFC-11 by heating from discarded rigid polyurethane foams

研究了聚氨酯硬泡在不同温度加热过程中的质量损失、生成的气体成分及硬泡结构变化,并对加热聚氨酯硬泡时所释放的发泡剂CFC-11(CCl3F)进行了测定.结果表明,在80～160℃加热聚氨酯硬泡时,CFC-11的释放速率随温度的增加而增加.将破碎后的硬泡颗粒在160℃下加热,既保证硬泡颗粒不发生热解反应,又使包裹和吸附于硬泡中的CFC-11移除速率最快.在160℃下加热过4mm筛硬泡颗粒1,2,4h后,可分别移除的CFC-11占硬泡颗粒中总量的84.5%、95.5%和96.6%,残余CFC-11则需足够长时间才可移除,而加热释放气体中CFC-11占82%～85%.

The mass loss,emitted gas composition and structure change of rigid polyurethane foam（PUR foam） at different temperature were investigated,and the amount of released blowing agent,CFC-11（CCl3F） was determined when PUR foam was heated. The release rate of CFC-11 increased with the rise of temperature when the temperature was in range of 80～160℃. At 160℃,particles of PUR foam were not decomposed and the CFC-11 that was adsorbing or wrapping in PUR foam was removed at the highest speed. Foam particles which were through 4mm sieve were heated to 160℃ for 1h,2h and 4h,respetively,then the corresponding 84.5%,95.5% and 96.6% amount of CFC-11 in the foam particles was removed,respectively. It took a long time to completely remove the residual CFC-11. The amount of releasing CFC-11 accounted for 82%～85% of the total heating release gas.