目的 采用端羧基液体丁腈橡胶(CTBN)对海因环氧树脂进行增韧改性。方法 通过热熔法将不同份数的CTBN添加到海因环氧树脂中，以4,4'–二氨基二苯甲烷为固化剂制备了改性环氧树脂，通过固化动力学研究确定了其固化工艺，考察CTBN用量对改性树脂体系的反应活性、力学性能、热性能以及断面微观形貌的影响。结果 随着CTBN的加入，改性树脂的固化放热峰向高温方向偏移。CTBN可显著提高树脂体系的断裂伸长率和冲击强度，其热性能基本保持不变。改性树脂的断面呈现两相“海岛”结构。结论 CTBN对海因环氧树脂有明显的增韧作用，制备的改性树脂体系可用于金属防腐涂料和胶黏剂等材料。

The work aims to improve the toughness of hydantoin epoxy resin by incorporating carboxyl-terminated liquid nitrile rubber (CTBN). CTBN of different amounts were added to the hydantoin epoxy resin through the melt-blending method. The modified epoxy resin was prepared with 4,4'-diaminodiphenylmethane as the curing agent. The curing process was determined by studying the curing kinetics. The effects of CTBN content on the reaction activity, mechanical properties, thermal properties, and cross-sectional microstructure of the modified resin system were investigated in detail. The results showed that the addition of CTBN shifted the curing exothermic peak of the modified resin towards the direction of higher temperature, and CTBN significantly improved the fracture elongation and impact strength of the resin system, while the thermal properties remained relatively unchanged. The cross-sectional microstructure of the modified resin exhibited a two-phase "island" structure. In conclusion, CTBN has a significant toughening effect on hydantoin epoxy resin, and the resulting modified resin system can be used for metal corrosion-resistant coatings and adhesives.