TDI三聚体的合成及其在弹性体中的应用

以2，4-甲苯二异氰酸酯（TDI）为原料成功合成出了TDI三聚体，并用三聚体合成出了以聚醚二醇（PTHF）为基体的PUU弹性体。结果表明：TDI三聚反应的最佳条件为：反应温度为50℃，催化剂浓度0．05％。在三聚反应进程中，随着反应进度的增加，体系中残余NCO的含量逐渐降低，三聚化程度逐渐提高。用三聚体改性的材料拉伸强度、扯断伸长率和永久变形都有不同程度的下降；在热失重30％时的分解温度提高了约20℃，这对于改善材料在高温下的性能提供了新的思路。

Synthesize of Ternary Polymerization Toluene Diisocyanate and Application on Elastomers

A TDI terpolymer, was prepared by co-trimerizing ring reaction of 2,4-tolylene diisocyanate and the polyure thane-urea（PUU） elastomer was synthesized by TDI terpolymer. The results showed that the optimal synthetic technics of TDI terpolymer were determined as follows： reacting at 50℃ ,0.05% catalyst; the NCO group content in the system lowed little by little with increase in the degree of co-trimerizing ring reaction and the degree of co-trimerizing ring reaction of tolylene diisocyanate was deepened. The mechanics performance of PUU showed that the properties of the materials modified by TDI terpolymer were lower, such as tensile strength, elongation-at-break and permanent deformation. The Td 30% of PUU was improved about 20℃ ,which gives us a chance to get a good property of PUU on high temperature.