【目的】提升无溶剂环氧防火涂料在工程应用中的施工效率（黏度问题）和防火性能。【方法】采用正交试验确定最佳比例，通过扫描电子显微镜（ SEM）和隔热效率测试炉等系统研究无溶剂环氧体系的施工黏度和防火性能。【结果】以双酚 A环氧树脂（ NPEL-128）作为成膜物，聚酰胺树脂（ PA）作为固化剂制备的无溶剂环氧防火涂料（体系 1）混合黏度 2. 6 Pa·s，适合抹涂施工，涂层厚度为 13. 6 mm时，耐火极限 3h，膨胀倍率 7倍；以 NPEL-128/双酚 F环，氧树脂（ NPEL-170）/聚丙二醇二缩水甘油醚（ PPGDGE）作为成膜物，酰胺基胺树脂作为固化剂制备的无溶剂环氧防火涂料（体系 2）混合黏度 1. 5 Pa·s，适合喷涂施工，涂层厚度为 7. 7 mm时，耐火极限 2h，膨胀倍率 15倍。【结论】 2种体系均能有效，提高施工效率并具有良好的防火性能。

［Objective］To improve the application efficiency（viscosity issues）and fire-retardant performance of solvent-free epoxy fire-retardant coatings in engineering applications.［Methods］ Orthogonal experiments were conducted to determine the optimal ratio. The application viscosity andfire-retardant performance of the solvent-free epoxy system were systematically investigated usingscanning electron microscopy（SEM） and thermal insulation efficiency test furnaces.［Results］ Solvent-free epoxy fire-retardant coatings（System1） were prepared using bisphenol A epoxy resin（NPEL-128）as the film-forming agent and polyamide resin（PA）as the curing agent. With a mixed viscosity of 2. 6 Pa·s，it was suitable for trowel application. At a coating thickness of 13. 6 mm，it achieved a fire resistance rating of 3 hours and an expansion ratio of 7 times. Solvent-free epoxy fire-retardant coatings were prepared with NPEL-128/bisphenol F epoxy resin（NPEL-170）/polypropylene glycol diglycidyl ether（PPGDGE） as the film-forming agent and amide-based amine resin as the curing agent（System2）. With a mixed viscosity of 1. 5 Pa·s，it was suitable for spray application. At a coating thickness of 7. 7 mm，it exhibited a fire resistance rating of 2 hours and an expansion ratio of 15 times.［Conclusion］ Both systems could effectively improve construction efficiency and offerexcellent fire-retardant performance.