【摘要】 以混合聚醚和甲苯二异氰酸酯(TDI)为原料合成的预聚体作为A组分,以聚醚N220、3,3’-二氯-4,4’-二氨基二苯基甲烷(MOCA)、1,4-丁二醇(BDO)、水、辛酸亚锡、氧化铈粉末磨料等的混合物为B组分,将A、B均匀混合,通过半预聚体法合成了微孔聚氨酯弹性体。考察了不同磨料含量、BDO和MOCA比例及发泡剂水用量对微孔聚氨酯弹性体力学性能的影响,通过傅里叶变换红外光谱表征了微孔聚氨酯弹性体的微观结构,并通过动态力学分析(DMA)研究了微孔聚氨酯弹性体的动态力学性能。结果表明,磨料质量分数为14%、BDO和MOCA摩尔比为3∶7及水质量分数为0.6%时,制备的微孔聚氨酯弹性体力学性能较好,与进口样品接近;在环境温度低于50℃时,材料具有良好的抗形变能力和冲击强度;起始分解温度约为200℃,是一种性能良好的聚氨酯抛光材料。更多还原

【Abstract】 Prepolymers synthesized by polyether polyols and toluene diisocyanate( TDI) was component A.The mixture of N220,3,3’-dichloro-4,4’-diamino dianilino methane( MOCA),1,4-butanediol( BDO),water,stannous octoate,fillers( ceria) was component B. The microcellular polyurethane elastomer was synthesized through a kind of semi-prepolymer method by mixing component A and B uniformly. The effects of different abrasive content,the BDO / MOCA ratio,and water dosage on physical properties of microcellular polyurethane elastomer were studied. The microstructure structure and the dynamic mechanical properties were analyzed by means of Fourier transform infrared( FT-IR) spectroscopy and DMA. The results showed that,when abrasive content was14%,BDO / MOCA molar ratio was 3 ∶7 and water dosage was 0. 6%,mechanical properties of microcellular polyurethane elastomer were better close to imported sample. When the ambient temperature was below 50 ℃,the ability of resistance deformation and impact strength of the material were good,the initial decomposition temperature of material was about 200 ℃ and it was a good polishing material.更多还原