【摘要】 选用以丙三醇为起始剂制备的聚醚多元醇N303与聚醚多元醇H303进行复配,采用一步法制备了N303/H303复合软段聚氨酯泡沫塑料(PUF),研究了N303/H303复合软段配比以及二氧化硅(SiO2)填料对PUF性能的影响。结果表明,N303/H303复合软段PUF压缩模量与冲击强度均高于单一软段PUF;随软段中H303含量增大,PUF压缩模量与冲击强度呈先上升再下降的趋势,在N303/H303质量比为50/50时达到最大值;添加5%~15%(质量分数,下同)的SiO2能作为成核剂,PUF泡孔均匀性提高且细化泡孔;PUF高温压缩性能保持较好。更多还原

【Abstract】 A bi-soft-segment PUF was prepared from a mixture of polyether N303 and H303,and the latter was prepared from glycerol.The effect of the weight ratio of N303/H303 and SiO2filler on the properties of PUF was investigated.The mechanical stability at higher temperature was tested.It was found that the compress modulus and impact strength of the bi-soft-segment PUF were higher than those of either single-soft-segment PUF.The compress modulus and impact strength increased first and then decreased as a function of H303 weight ratio and reached a maximum when the ratio of N303/H303 was 50∶50.Pre-mixed SiO2 played a role to improve the cell uniformity and stabilize mechanical properties at higher temperature.更多还原