Abstract: ［Objective］To address issues such as slow drying speed and short pot life during theapplication of waterborne epoxy primers.［Methods］Acrylic acid was used to perform ring-opening modification on epoxy resin，synthesizing a chain extender AAE51 containing carbon-carbon double bonds（C=C）capable of undergoing Michael addition reactions. Utilizing the characteristic that thedouble bond of this intermediate preferentially reacts with sterically hindered secondary amines（—NH—） during the Michael addition reaction，a waterborne epoxy curing agent with a highly crosslinked network structure was constructed. The chemical structure of the chain extender was characterized usingFourier-transform infrared spectroscopy（FT-IR）. The effects of the AAE51 addition amount on the stability of the curing agent，as well as the drying performance and corrosion resistance of the resulting coating films，were systematically investigated.［Results］When the addition amount of AAE51 in the waterborne epoxy curing agent was 8%（based on the total mass of the curing agent）， the curing agent had moderate viscosity and good water solubility. The self-drying performance of the coating filmformulated with it at room temperature was significantly improved，reaching a hardness of HB in12 hours and H in 24 hours. It could withstand 336 hours of salt-spray testing without blistering on thepanel surface，and the peeling width in the scratched area was less than 3 mm. It also showed noblistering after 336 hours of initial water resistance testing，and the system viscosity maintained good stability within a 3-hour pot life.［Conclusion］In this study，through the Michael addition reaction， the NH groups that are difficult to react with epoxy are fully utilized to form a network structure，therebyincreasing the glass-transition temperature of the curing agent and achieving the goal of acceleratingthe drying speed of the film.

Key words: waterborne epoxy curing agent, acrylic modification, epoxy resin, Michael addition, applicable period, fast-curing

摘要： 【目的】解决水性环氧底漆施工过程中干燥速度慢、适用期短等问题。【方法】通过丙烯酸对环氧树脂进行开环改性，合成含可发生 Michael加成反应的碳碳双键（ C=C）的扩链剂 AAE51；利用该扩链剂的双键在 Michael加成反应中优先与空间位阻较大的仲胺（ —NH—）发生反应的特性，构建具有高交联密度网络结构的水性环氧固化剂，并用其制备双组分环氧涂料。采用红外光谱仪（ FT-IR）对扩链剂化学结构进行表征；系统研究了 AAE51添加量对固化剂稳定性、漆膜干燥性能及耐腐蚀性的影响。【结果】当水性环氧固化剂中 AAE51的添加量为 8%（以固化剂总质量计）时，固化剂黏度适中、水溶性良好，由其配制的漆膜室温自干性能显著提升， 12 h硬度即可达到 HB，24 h达到 H；耐盐雾 336 h板面不起泡，划痕区域剥落宽度 <3 mm，初期耐水 336 h不起泡，且在 3h适用期内，体系黏度稳定。【结论】通过 Michael加成反应，充分利用难以与环氧反应的仲胺，形成网络结构提高固化剂的玻璃化转变温度，可达到提高漆膜干燥速度的目的。

关键词: 水性环氧固化剂, 丙烯酸改性, 环氧树脂, 迈克尔加成反应, 适用期, 快干型

CLC Number: 

• TQ630. 4