目的 制备一种具有自修复性的涂料，评价并分析涂层的自修复机理和自修复效率。方法 通过预聚体法，将聚己内酯和异佛尔酮二异氰酸酯在氮气气氛预聚后，降温加入双硫扩链剂和交联剂反应，在得到的产物中加入溶剂、消泡剂、流平剂等，得到聚酯型聚氨酯可自修复涂料。采用红外和拉曼光谱进行化学结构表征，采用百格实验和邵氏硬度计进行附着力和硬度测定，通过三维视频显微镜和拍照记录涂层在不同温度、不同损伤程度和不同厚度下的自修复时间，考察该涂层的自修复性能。采用热重分析仪对样品进行热性能表征。结果 拉曼光谱中510 cm-1处S—S键的特征峰和640 cm-1处C—S键的特征峰清晰可见，涂料的附着力为1级，邵A硬度为73。自修复速率随温度升高而加快，自修复时间从室温下300 min，缩短至100 ℃下5 min，不同厚度和不同损伤程度涂层的自修复能力不同。热重分析表明，该涂层的热稳定性随交联程度的增加而提高，所有涂层的热分解温度都高于334.6 ℃。结论 具有自修复功能的双硫键被成功引入聚氨酯结构中，得到的自修复涂层的硬度和热稳定性均满足常规使用要求，该涂层的自修复能力受修复温度、涂层厚度和损伤程度的影响明显。

The work aims to prepare a self-healing coating and evaluate and analyze the self-healing mechanism and self-healing efficiency of the coating. After prepolymerization in nitrogen atmosphere by prepolymer method, polycaprolactone and isophorone diisocyanate were added with disulfide chain extender and crosslinking agent and then the product was mixed with solvent such as antifoaming agent and leveling agent to obtain polyester type polyurethane self-healing coating. FTIR and Raman spectroscopy were used to characterize the chemical structure. The adhesion and hardness were measured by the Baige test and the Shore hardness tester. The self-healing properties of the coating, mainly expressed in self-healing time at different temperature, different damage levels and different thicknesses were recorded by three-dimensional video microscope and photographing. The thermal properties of the samples were characterized with thermogravimetric analyzer. The characteristic peaks of the S—S bond at 510 cm-1 and the C—S bond at 640 cm-1 were clearly visible, with adhesion of Grade I and Shore hardness of 73. The self-healing rate was accelerated with the increase of temperature from 300 min at room temperature to 5 min at 100 ℃. The effectiveness of self-healing was also affected by coating thickness and damage degree. The thermal stability of the coating increased with increasing degree of cross linking and the thermal decomposition temperature of all coatings was higher than 334.6 ℃. The disulfide bond with self-healing function is successfully introduced into the polyurethane structure. The hardness and thermal stability of self-healing coating all reach the requirements of conventional use. The self-healing ability of the coating is affected by the healing temperature, coating thickness and degree of damage.