液态CO2辅助水发泡在喷涂聚氨酯硬泡中的研究

摘要

采用改进的聚氨酯硬泡喷涂高压发泡机,在水发泡时把液态CO2作为第三组分添加,对比了不同含量CO2发泡的泡沫制品的性能差异.结果表明,在不影响泡沫闭孔率的基础上,添加体积分数为0.5%~1%的液态CO2可以有效改善全水发泡的泡孔均匀性、绝热性能和尺寸稳定性.%Using the improved high pressure foaming machine for spraying rigid polyurethane ( PU) foam, the liquid CO2 was added as the third component in the preparation of rigid polyurethane using water foaming. The dif-ferent performance between the PU foams with different CO2 contents was compared. The results showed that the cell uniformity, thermal insulation and dimensional stability of PU foam were improved by adding 0. 5%~1% ( volume fraction) liquid CO2 without affecting the closed porosity of the foam.