摘要
结合发泡升温曲线、泡沫生长高度及凝胶时间考察了Al2O3、TPU、PE与GP这4种微粉对于PU泡沫内部高反应热的影响。结果表明,PE微粉最适合用在PU发泡体系中起降温效果,可解决烧芯问题,同时对PU发泡生长过程影响较小,还可缩短凝胶时间,主要是由于PE的相变储能效应,即在反应前期体系升温时吸热熔融,储存了部分能量,而在反应后期体系降温时结晶产生放热效应,有利于缩短泡沫的养生期。当PE添加质量分数为3%时,PE/PU泡沫的拉伸强度、压缩强度与断裂伸长率分别比PU泡沫提高了67%、26%与35%,且在1.5-6.0 k Hz时的吸声系数亦有明显提升。
Combined with the foaming temperature raising curve,the foam growth height and the gel time to investigate the effect of four kinds powder such as Al_2O_3,TPU,PE and GP on the high reaction heat inside PU foam system.The results showed that the PE powder was most suitable for use in PU foaming system for cooling effect,could solve the problem of core burning,at the same time had less affect for PU foaming growth process,and also could shorten the gel time.It was mainly due to the phase change energy storage effect of PE,that end other micmelting in the early stage when the system temperature raising,stored energy,whereas in the later stage it produced exothermic effect when the system temperature reducing to crystallization,which was helpful to shorten the curing period of foam.When mass fraction of added PE was 3%,the tensile strength,compression strengthand elongation of PE/PU foam increased67%,26%and 26%respectively compare to PU foam,and the sound absorption coefficient improved significantly in 1.5~6.0 k Hz.polyurethane foam;low reaction heat;phase change energy storage;absorption coefficient
出处
《化工生产与技术》
CAS
2016年第4期21-24,共4页
Chemical Production and Technology
关键词
聚氨酯泡沫
低反应热
相变储能
吸声系数
polyurethane foam
low reaction heat
phase change energy storage
absorption coefficient
