【作者】 刘凉冰；

【Author】 Liu Liangbing;Shanxi Provincial Institute of Chemical Industry;

【机构】 山西省化工研究所；

【摘要】 以聚己二酸乙二醇丙二醇酯(PEPA)、4,4’-二苯基甲烷二异氰酸酯(MDI)为原料,用1,4-丁二醇(BDO)扩链剂或混合扩链剂制备了聚氨酯(PU)弹性体。讨论了预聚体NCO质量分数、扩链剂和催化剂用量对聚氨酯弹性体力学性能的影响;同时,比较了MDI/BD0体系与TDI/MOCA体系的性能。结果表明,聚氨酯弹性体的硬度、模量和强度随预聚体NCO基含量增加而增加,提高扩链剂的三元醇含量,弹性体力学性能呈下降趋势,MDI/BDO体系比TDI/MOCA体系的扯断伸长率和撕裂强度高。更多还原

【Abstract】 Polyurethane(PU) elastomers were prepared with poly(ethylene propylene adipate) glycol(PEPA),4,4’- diphenylmethane-diisoyanate(MDI) and mixture of1,4-butanediol(BDO) and trimethylolprpane(TMP).The influence of molecular weight of soft segment,mass fraction of NCO in perpolymer and crosslinking agent on the mechanical properties of the PU was studied.The results showed that the mechanical properties of PU increased with the increase of mass fraction of NCO in prepolymer.When the content of TMP in chain extenders increased,the mechanical properties of PU decreased.The tear strength and resilience of MDI-PU were better,but the tensile strength of TDI-PU was higher and the Comp.Set of TDI-PU was less with same hardness.更多还原