异氰脲酸酯改性MDI及聚氨酯弹性体合成研究

The Modification of MDI by Isocyanurate and Synthesis of PU Elastomers

在催化剂作用下，MDI自聚生成环状异氰脲酸酯，用此改性MDI合成了聚氨酯弹性体。试验结果表明，MDI在DMP-30催化作用下的自聚产物主要为三聚体异氰脲酸酯；DMP-30浓度为0.8％时，改性MDI的－NCO基含量约为MDI中含量的50％；温度对改性程度的影响不明显，在50℃时改性程度最高；以改性MDI合成的弹性体，其热稳定性和力学性能随改性程度的增加而提高。

In the presence of catalyst,cyclic isocyanurate is prepared from the self-polymeriza-tion of MDI. PU elastomers are prepared from the modified MDl. The results show that the self-polymerization of MDI catalyzed by DMP-3O produces trimer (isocyanurate )mainly; when DMP-3o concentration is 0. 8%, the NCO group content in the modified product is 50% of that in MDI; temperature has little effect on the modification,and the maximun modification degree can be obtained at about 50℃;the greater the content of the modified MDI in the PU elastomer, the better the thermal and mechanical properties of the elastomer.