The effects of the blowing agent HCFC-141b in the formula of rigid polyurethane foam panel re-placed in part by HFC-245fa on the properties change in reaction time, foam density, limited oxygen index, foa-ming curve, compression strength, thermal conductivity, dimensional stability and weather resistance were re-searched. The results showed that the reaction time was prolonged, and the foam had higher density in free foaming process after the replacement, while the panel had lower density, lower compression strength, lower thermal con-ductivity, better dimensional stability and the panel could pass the test of weather resistance. The limited oxygen in-dex had no obvious changes.%研究了发泡剂HFC-245fa在硬质聚氨酯泡沫板材配方体系中替代部分发泡剂HCFC-141b后对反应时间、泡沫密度、氧指数、发泡曲线、压缩强度、导热系数、尺寸稳定性、耐候性等方面的影响.实验结果表明,用部分HFC-245fa替换体系中的HCFC-141b后,自由发泡速度减慢,密度增加;生产的板材密度降低,压缩强度降低,导热系数降低,尺寸稳定性提高,可以通过耐候性实验测试,泡沫的氧指数基本不变.
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