【目的】探索哌嗪作为低毒、可生物降解的后扩链剂在开发高性能环境友好型聚氨酯材料中的应用潜力。【方法】以聚碳酸酯二元醇（PCDL）、异佛尔酮二异氰酸酯（IPDI）和哌嗪等为主要原料，通过后扩链技术制备了不同哌嗪含量的水性聚氨酯（ WPU）分散体，系统研究哌嗪对分散体性能及涂膜力学性能、疏水性和热稳定性的影响。【结果】哌嗪的引入显著优化了材料性能：随着哌嗪含量增加，水性聚氨酯分散体的粒径逐渐减小，黏度逐渐增大；涂膜水接触角逐渐增大，拉伸强度最大可达 19. 42 MPa，断裂伸长率最大为 909. 81%。【结论】哌嗪作为低毒、可生物降解的后扩链剂，在保持涂膜良好的力学性能和耐热性的同时还增强了其环保性，为开发高性能环境友好型聚氨酯材料提供了理论依据和技术支持。

［Objective］ To explore the potential application of piperazine as a low-toxic andbiodegradable post-extension agent in the development of high-performance environmentally friendlypolyurethane materials.［Methods］ Waterborne polyurethane（WPU） emulsions with different piperazine contents were prepared by post-extension technology using polycarbonate diol（PCDL）， isophorone diisocyanate（IPDI）and piperazine as the main raw materials. The effects of piperazine onthe properties of emulsions and the mechanical properties，hydrophobicity and thermal stability of films were systematically study.［Results］The introduction of piperazine significantly optimized the material properties：with the increase of piperazine content，the particle size of WPU emulsions gradually decreased，the viscosity gradually increased；the water contact angle gradually increased；the tensile strength could reach up to 19. 42 MPa，and the elongation at break could reach up to 909. 81%. ［Conclusion］ As a low-toxic，biodegradable post-chain extender，piperazine enhances its environmental friendliness while maintaining the coating's good mechanical properties and heat resistance，providing theoretical basis and technical support for the development of high-performanceenvironmentally friendly polyurethane materials.