MDI-50型聚氨酯弹性体材料合成及性能研究

摘要

利用MDI-50、聚醚多元醇和3,3’-二氯-4,4’--二氨基-二苯基甲烷(MOCA)扩链剂制备了MDI-50型聚氨酯弹性体,研究了游离异氰酸酯基质量含量、聚醚多元醇相对分子质量对MDI-50聚氨酯弹性体力学性能的影响,采用示差扫描量热分析(DSC)、热重分析(TG)、红外光谱(FTIR)及力学性能等测试方法对MDI-50型聚氨酯弹性体的结构及性能进行了表征和分析,并与TDI-80型聚氨酯弹性体相比较.结果表明:MDI-50型聚氨酯弹性体的综合性能明显优于TDI-80型.MDI-50型弹性体的硬度、撕裂强度和抗拉强度都随预聚体游离-NCO质量含量的提高而增大,随聚醚多元醇软链段相对分子质量增大而减小,而断裂伸长率相反.%MDI-50, polyol and 3,3'-dichloro-4,4'-diamino-diphenylmethane (MOCA) chain extender were used to prepare MDI-50 type polyurethane elastomer. The effects of the mass fraction of free -NCO in prepolymer and molecular weight of polyol on mechanical properties of the elastomer were studied. The structure and performance were analyzed by means of differential scanning calorimeter (DSC) , Thermo gravimetric analysis (TG), Fourier transform infrared (FTIR) spectroscopy and mechanical properties test. And it was compared with TDI-80 type polyurethane elastomer. The results showed that the comprehensive properties of MDI-50 type polyurethane elastomer were better than TDI-80 type polyurethane elastomer. The hardness, tearing strength and tensile intensity of MDI-50 type polyurethane elastomer increased with the increase of the mass content of free -NCO in prepolymer. When the molecular weight of polyol increased, the elongation at break of the elastomer increased.