【目的】采用自制的封闭型多异氰酸酯固化剂，开发高性能光热太阳能镜背涂料。【方法】以脂肪族六亚甲基二异氰酸酯（HDI）、三羟甲基丙烷（TMP）、3，5-二甲基吡唑为原料合成封闭型多异氰酸酯固化剂。配合功能型聚酯面漆，制备单组分镜背涂料，研究该涂料在光热太阳能镜镜背上的应用性能。【结果】当 n（—NCO）∶n（—OH）为 0. 8∶1时，满足 170 ℃/3 min的快速固化要求。固化后的漆膜铅笔硬度、柔韧性、耐冲击性、耐磨性等优异。耐人工气候老化 4 000 h后漆膜无开裂、粉化，耐 5%中性盐雾 2 000 h后漆膜无边缘腐蚀，漆膜耐温变、耐湿热性能均可达到技术要求。【结论】该光热太阳能镜背涂料性能优异，应用前景广泛。

［Objective］To develop a high-performance coatings for the backside of solar thermal mirrors using a self-made blocked polyisocyanate curing agent.［Methods］ The blocked polyisocyanate curings agent was synthesized using aliphatic hexamethylene diisocyanate（HDI）， trimethylolpropane（TMP），and 3，5-dimethylpyrazole as raw materials. A one-component mirror backcoatings was prepared with functional polyester topcoat，and the application performance of this coatingon the back of solar thermal mirrors was studied.［Results］When the ratio of n（—NCO）to n（—OH） was set at 0.8，the coatings met the requirement of rapid curing at 170 ℃ for 3 minutes. The cured paint film exhibited excellent mechanical properties such as pencil hardness，flexibility，impact resistance and abrasion resistance. After 4 000 h of artificial weathering test，the paint film showed no cracking or chalking. After 2 000 h of 5% neutral salt spray test，the paint film displayed no edgecorrosion. Both of the technical requirements for temperature change resistance and heat and humidityresistance of the paint film were met.［Conclusion］ This solar thermal mirror back coating has excellent performance and broad application prospects.