MDI-50型聚氨酯弹性体材料合成及性能研究

Study on Synthesis and Properties of MDI-50 Type Polyurethane Elastomer

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.