改性石墨烯/水性环氧树脂复合涂料的制备及性能研究

Preparation of Modified Graphene/Waterborne Epoxy Resin Composite Coating and Evaluation of Its Performance

为了有效改进水性环氧树脂涂料的耐腐蚀性和漆膜脆性,在原水性环氧树脂涂料体系中添加改性石墨烯功能填料,利用磺酸基对石墨烯结构改性,选择不同的分散介质、相转移催化剂等,经过冷、热及强紫外光照射,对该分散体系进行加速失效评价试验;并通过SEM、TG对改性石墨烯分散液的体系稳定性进行了表征,将该改性石墨烯分散液与水性环氧涂料进行复配,经过多项性能指标表征,确定了最佳工艺配方。结果表明:优化配方的涂层附着力为1级,柔韧性为0.5 mm,正反冲的冲击强度为500 N·cm,硬度达0.62。该改性石墨烯/水性环氧涂料体系具有较好的应用前景。

In order to effectively improve the corrosion resistance and brittleness of waterborne epoxy resin coating,modified graphene functional filler was added into the original waterborne epoxy resin coating system.In this work,the sulfonate group was used to modify the structure of graphene through selecting dispersion media and phase transfer catalysts.The accelerated failure evaluation experiment of the dispersion system was carried out under the condition of cold,hot and strong ultraviolet light irradiation.Moreover,the stability of the modified graphene dispersion solution was characterized by SEM and TG,and the modified graphene/water-based epoxy coating was prepared by combining with waterborne epoxy resin.After characterization of performance,the best process formula was determined.Results showed that the coating had adhesion of Level 1,flexibility of 0.5 mm,impact strength of 500 N·cm,and hardness of 0.62.The modified graphene/waterborne epoxy coating system presented a wide application prospect.