为了解决水性生物基聚氨酯力学性能较低的问题，以生物基多元醇（蓖麻油与异山梨醇）、异佛尔酮二异氰酸酯、 2，2-羟甲基丙酸、季戊四醇三丙烯酸酯和三乙胺为原料，合成了水性光固化生物基聚氨酯。通过傅立叶变换红外光谱仪、核磁共振波谱仪、 Zeta电位及纳米粒度分析仪等对乳液结构进行表征，并对涂膜的力学性能、透过率、基本性能进行分析。结果表明：随着异山梨醇含量的增加，涂层的拉伸应力从从 4. 9 MPa增长到 26. 8 MPa，断裂伸长率从 269%下降至 4. 1%；在可见光波段范围内各涂层光透过率均维持在 90%以上。因此，在合适的蓖麻油与异山梨醇的配比下生物基聚氨酯涂膜的力学性能显著提升，并且在可见光波段具有良好的透明度。

In order to solve the problem of low mechanical properties of waterborne bio-based polyurethane，a waterborne UV-curable bio-based polyurethane was synthesized using bio-based polyols（castor oil and isosorbide）， isophorone diisocyanate，2，2-hydroxymethylpropionic acid，pentaerythritol triacrylate and trimethylamine. The structures of emulsion were characterized by Fourier transform infrared spectroscopy（FT-IR），nuclear magnetic resonance spectroscopy，zeta potential instrument and nanoparticle size analyzer. The mechanical properties，transmittance and other basic properties of coating were also studied. The results showed that，with the increase of isosorbide content，the tensile stress increased from 4. 9 MPa to 26. 8 MPa，the elongation at break decreased from 269% to 4. 1%，and the light transmittance of each coating remained above 90% in the visible light. Therefore，the mechanical properties of bio-based polyurethane coating were significantly improved with a suitable ratio of castor oiland isosorbide，and good transparency in the visible light was also abtained.