关键词: 大豆分离蛋白, 聚氨酯泡沫塑料, 生物降解, 阻燃, 回弹率

Abstract: The development of environmental friendly polyurethane foams is a focus in polyurethane industry. By introducing soy protein isolate（SPI）and flame retardant polyols into polyurethane（PU），environmental friendly flame retardant high resilience flexible polyurethane foams were prepared by free foaming. The effects of SPI content and addition manner on the physical，mechanical，biodegradability，and flame retardant properties of PU foams were investigated. The results show that，introducing SPI by adding not by substituting for polyols is an effective way to improve the performance of PU foam. By adding a small amount of SPI，the open cell ratio，elongation at break，resilience，comfort factor，density，and indentation force deflection value of PU foam are increased，while the tensile strength，limited oxygen index，and compression set value are slightly affected. SPI changes the structure of rigid segments，hence effectively enhances the biodegradability of PU foam.

Key words: soy protein isolate, polyurethane foam, biodegradability, flame retardant, resilience