加热移除废弃聚氨酯硬泡中CFC-11的研究

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%.

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

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.