摘要
以不同相对分子质量的聚醚多元醇(PPG)、TDI和3,5-二乙基甲苯二胺(DETDA)为原料,采用溶剂法合成了聚氨酯(PU)弹性体,分别研究了溶剂种类、NCO含量、聚醚多元醇相对分子质量、扩链系数等对PU弹性体力学性能的影响。结果表明,二甲苯对PU弹性体性能影响最小;PU弹性体的硬度、定伸模量、拉伸强度和撕裂强度随聚醚多元醇的相对分子质量的升高而下降,冲击弹性、伸长率和永久变形随聚醚多元醇的相对分子质量的升高而上升;当预聚体NCO质量分数为6.30%、扩链系数为0.95时,PU弹性体的综合力学性能最佳。
Polyurethane elastomer was prepared with solution method, using polyoxypropylene glycol （PPG）, TDI and 3,5 -diethyltoluene diamine （DETDA） as materials. The effect of the kinds of solVent, content of NCO, the molecular weight of polyether polyol and chain extension coefficient on the PU elastomer mechanical properties were studied. The results showed that the effect of xylene on PU elastomer property was the least. The＇ hardness, extend stress, tensile strength and tear strength of PU elastomer were decreased with the increasing of molecular weight of polyether polyol. The mechanical property of PU elastomer was the best when prepolymer NCO content was 6.30%, chain-extending coefficient was 0.95.
出处
《聚氨酯工业》
2007年第2期28-31,共4页
Polyurethane Industry
