摘要： 【目的】利用超支化聚合物和聚碳酸酯二醇的优良结构特性，拓展水性聚氨酯涂料的应用场景。【方法】以聚碳酸亚丙酯二醇（ PPCD）、异佛尔酮二异氰酸酯（ IPDI）、 2，2-二羟甲基丙酸（ DMPA）等为原料，调整 DMPA用量制备了可 UV固化的水性超支化聚氨酯丙烯酸酯分散体（ WHPUA）。通过傅立叶变换红外光谱仪和核磁共振波谱仪对 WHPUA的化学结构进行了表征，并探究了 R值和 DMPA用量对 WHPUA性能的影响。【结果】随着 R值的增加，分散体粒径逐渐减小，涂层硬度提升、附着力先升高后降低；当 R值为 1. 6时，涂层硬度高且分散体性能相对稳定，与 PET基材的界面结合力强。随 DMPA用量增加，分散体粒径逐渐下降，当 DMPA用量为 19. 4 mmol时，制备的 WHPUA-4分散体性能较好，涂层硬度达 3H，划格试验 0级，胶膜水接触角为 64. 3°，同时胶膜也具备良好的力学性能及热稳定性。【结论】超支化聚合物独特的三维球型结构改善了线型聚氨酯丙烯酸酯水性涂料物理化学性能，使其应用场景更加广泛。

关键词: 超支化, 水性聚氨酯, 聚碳酸酯, UV固化涂料

Abstract: ［Objective］Leveraging the favorable structural properties of hyperbranched polymersand polycarbonate diols to expand the application scenarios of waterborne polyurethane coatings.［Methods］ Using poly（propylene carbonate） diol（PPCD）， isophorone diisocyanate（IPDI）， 2，2-dimethylolpropionic acid（DMPA）， etc. as raw materials，a series of UV-curable waterborne hyperbranched polyurethane acrylate dispersions（WHPUA） were prepared by adjusting the DMPA content. The chemical structures of WHPUA were characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The effects of the R value and DMPA content on the properties of WHPUA were investigated.［Results］ As the R value increased，the particle size of the dispersions gradually decreased，the coating hardness improved，and the adhesion increased and then decreased. When the R value was 1. 6，the coating exhibited high hardness， relatively stable dispersion performance，and strong interfacial adhesion with PET substrate. With an increase in DMPA content，the particle size of the dispersions gradually decreased. When the DMPA content was 19. 4 mmol，the prepared WHPUA-4 dispersion showed favorable overall performance， with a coating hardness of 3H，an adhesion rating of 0，a water contact angle of 64. 3° for the film，as well as good mechanical properties and thermal stability.［Conclusion］The unique three-dimensionalspherical structure of hyperbranched polymers enhances the physicochemical properties of linearpolyurethane acrylate water-based coatings，broadening their application scenarios. 

Key words: hyperbranched, waterborne polyurethane, polycarbonate, UV-curable coating

中图分类号: 

• TQ630. 4