目的 制备一种紫外光（UV）固化聚氨酯自愈合涂层，并研究其自愈合性能。 方法 以2.4-甲苯二异氰酸酯（TDI）、聚丙二醇（PPG）、三羟基聚醚多元醇（HSH330）、甲基丙烯酸羟乙酯（HEMA）、1,4-丁二醇（BDO）为原料，采用两步法合成UV固化丙烯酸酯改性聚氨酯涂层（APU）。使用红外光谱对合成涂层的化学结构进行表征，使用激光共聚焦显微镜对涂层的表界面性能进行分析，并使用拉力试验机考察涂层的力学性能、自愈合性能及成膜性能。结果 FTIR光谱结果表明，合成的涂层是丙烯酸酯改性聚氨酯涂层（APU），810 cm–1处存在来自HEMA的—C=C—双键弯曲振动峰，同时涂层仍呈现出明显的聚氨酯化学结构特性。随着HEMA的引入，涂层硬段质量分数从20%增加至40%的过程中，吸水率从36.8%降至3.1%，弹性模量从0.29 MPa增加至8.69 MPa。自愈合性能测试结果表明，随着HEMA的引入，涂层的自愈合率降低，当APU涂层硬段质量分数超过45%后，涂层失去自愈合能力。结论 制备的APU涂层具有优异的耐水性和致密性，由于HEMA含量的增加限制了软段结构的分子链运动和氢键作用，从而削弱了涂层的自愈合性能。

The work aims to prepare a UV curable polyurethane self-healing coating and study its self-healing properties. The UV curable acrylate modified polyurethane (APU) coatings were synthesized by two-stage method with 2,4-toluene diisocyanate (TDI), poly-propylene glycol (PPG), trihydroxy polyether polyol (HSH330), hydroxyethyl methacrylate (HEMA) and 1,4-butanediol (BDO) as raw materials. The chemical structure of the coating was characterized by Fourier Transform Infrared Spectrometer, the surface-interface property was analyzed by Laser Confocal Microscopy and the mechanical properties, self-healing properties and film forming properties were tested by Tension Testing. The FTIR curve results indicated that APU coating was synthesized with the bending vibration peak of —C=C— at 810 cm–1 from HEMA, while the coating still exhibited the obvious chemical structure characteristic of polyurethane. With the addition of HEMA, the hard segment content increased from 20% to 40%, the water-absorption rate of APU coating decreased from 36.8% to 3.1%, and the elastic modulus increased from 0.29 MPa to 8.69 MPa. The self-healing rates of APU coatings decreased due to the incorporation of HEMA. When the hard segment content of APU coating exceeded 45%, the coating lost self-healing property. The synthetic APU coatings have the good water-resistance and compactness. The addition of HEMA limits the molecular chain motion and the hydrogen bonding of soft segment, thus weakening the self-healing property of APU coating.