PAPI官能度和异氰酸酯指数对HFC-365mfc/H_2O混合发泡体系RPUF性能的影响  

Effects of PAPI Functionality and Isocyanate Index on the Properties of RPUF Blown by HFC-365mfc and Water

作　　者：张飞[1] 张子男[1] 张洪斌[1] 

机构地区：[1]上海交通大学化学化工学院高分子科学与工程系流变学研究所,200240

出　　处：《聚氨酯工业》2010年第5期24-27,共4页Polyurethane Industry

摘　　要：采用HFC-365mfc和H2O作为混合发泡剂制备了聚氨酯硬质泡沫材料,探讨了多亚甲基多苯基多异氰酸酯(PAPI)的官能度和异氰酸酯指数(R)对泡沫材料的玻璃化转变温度(Tg)、力学性能和泡孔结构的影响。结果表明,使用相同份数的发泡剂,在PAPI的官能度介于2.6～3.1范围内,官能度越高,所得泡沫密度越大、Tg越高,力学性能越好;当R介于1.05～1.50时,随R的增大,所得泡沫密度增加,Tg和力学性能均有提高,但当R过大时,泡孔的尺寸分布变宽,均一性变差。研究还发现,所得泡沫Tg和力学性能随熟化时间延长亦有所提高。The rigid polyurethane foams （RPUF） were prepared by using an environmentally friendly blowing agent of the mixture of HFC-365nffc and water. The effects of different functionalities of PAPI and the isocyanate index on compressive strength, glass-transition temperature （Tg） and cell morphology of the RPUF were investigated. The experimental results showed that with the functionality increasing range of 2.6 to 3.1 and with the same amount of blowing agent used, the RPUF fabricated had a bigger density, higher Tg and mechanical properties. The density, Tg and the mechanical properties of the obtained RPUF also increased with isocyanate index increased when the isocyantate index between 1.05 to 1.50. However, if the isocyanate index was more than 1.50, the cell size distribution of the RPUFs widened and uniformity was worse. It was also found that Tg and the mechanical properties of RPUF were improved with curing time enhancing.

关 键 词：聚氨酯硬质泡沫 官能度 异氰酸酯指数 力学性能 玻璃化转变温度 泡孔结构 

分 类 号：TQ328.2[化学工程—合成树脂塑料工业]