Effect of Different Types of Isocyanates on the Properties of MPU
The crude rubber of millable polyurethane(MPU)elastomer was synthesized with polytetra hydrofuran diol(PTMG,M=1 000),chain extender glycerol α-monoallyl ether and different diisocyanates as raw materials by prepolymerization process.Then several vulcanized MPUs were prepared by mixing and vulcanizing with various processing aids.The effects of diisocyanate structure on the mechanical properties,glass transition temperature,aging resistance and damping properties of MPU vulcanized rubber were studied.The results showed that the mechanical properties and damping properties of MDI-type MPU were the best,the thermal oxygen aging resistance of HMDI-type MPU was the best,and the TDI-type MPU was the worst,and the type of diisocyanates had no significant effect on the low-temperature performance of the millable polyurethane elastomers.
万方数据
维普
