破碎聚氨酯硬泡时CFC-11的释放量和残留量

Release and Residual Mass and Content Distribution of CFC-11 during Shredding of Rigid Polyurethane Foam

将聚氨酯硬泡在密闭室中破碎至不同粒径，低温加热后进行氧弹燃烧试验，利用气相色谱／质谱联用（GC／MS）定量每个过程中发泡剂CFC-11（CFC13）的释放量．结果表明：CFC-11释放量随破碎颗粒粒径的减小而增大，过4mm筛的颗粒释放效果最佳，CFC-11释放量占其总量的67％；泡沫中W（CFC-11）为20％左右，其中77％的CFC-11包裹在泡孔中，23％被泡沫固相吸附；即使将泡沫过1mm筛，部分未打破泡孔中仍有6％的CFC-11，当破碎粒径接近泡孔平均直径0．3-0．4mm时，CFC-11释放量保持不变，吸附于泡沫固相中的CFC-11在破碎过程中很难释放．

After rigid polyurethane foam （PUR foam） was shredded to different particle sizes in a closed room, foam particles were heated at low temperature and then an oxygen bomb was used to combust the foam particles. Finally, the release mass of blowing agent CFC- 11 in each process was determined by GC/MS. The results show that the release mass of CFC-11 increases with the decrease of shredding size ; shredding for passing through a 4 mm sieve is the optimum such that 67% of the total content of CFC-11 is released. The content of CFC-11 in foam is about 20% of foam mass, in which 77% of the total content of CFC-11 is wrapped in the cells and 23% is absorbed in the solid phase of foam. For foam particles passing through a 1 mm sieve, 6% of the total content of CFC-11 is still wrapped in some intact cells. When shredded particle size approaches average diameter of cells （0.3-0.4 mm）, release mass of CFC-11 will be unchanged. However, it is difficult in the shredding process to release CFC-11 which is absorbed in the solid phrase of the foam.