Zhang Xiaopeng, Wen Jie, Hu Baisong, Yuan Jinfeng, Wang Juan, Zhu Lei, Pan Mingwang
Institute of Polymer Science and Engineering, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, People's Republic of China.
Nanotechnology. 2020 May 15;31(20):205708. doi: 10.1088/1361-6528/ab72bc. Epub 2020 Feb 4.
Graphene oxide (GO) is expected to be used in the field of waterborne polyurethane (WPU) anti-corrosive coatings due to its excellent barrier property, but the poor dispersibility of GO limits its application. The hydrophilic modification of GO, although improving its dispersity, will greatly reduce its anti-corrosive property. Here, a new method is provided to avoid seeking an appropriate modifier blindly. Via the interaction between the epoxy group and amine group, the aminated GO (NGO) can be modified by (3-glycidyloxypropyl) trimethoxysilane (KH560) functionalized-silica (f-SiO) nanoparticles, while the f-SiO is affected by KH560 due to its relatively hydrophobic alkyl side chain. Consequently, the hydrophobicity of the f-SiO modified NGO (f-SGO) can be regulated just by adjusting the amount of KH560, thereby achieving the balance of excellent dispersibility and anti-corrosive performance of the f-SGO nanosheets in the WPU. The electrochemical impedance and potentiodynamic polarization results showed that the anti-corrosive performance of the WPU hybrid was greatly improved by adding the appropriate amount of f-SGO. This research provides a new idea for GO application in waterborne coatings.
氧化石墨烯（GO）因其优异的阻隔性能有望应用于水性聚氨酯（WPU）防腐涂料领域，但其分散性较差限制了其应用。对GO进行亲水性改性虽能提高其分散性，但会大大降低其防腐性能。在此，提供了一种新方法，避免盲目寻找合适的改性剂。通过环氧基团与胺基之间的相互作用，胺化氧化石墨烯（NGO）可被（3-缩水甘油氧基丙基）三甲氧基硅烷（KH560）功能化二氧化硅（f-SiO）纳米粒子改性，而f-SiO因其相对疏水的烷基侧链受到KH560的影响。因此，仅通过调整KH560的用量就可以调节f-SiO改性的NGO（f-SGO）的疏水性，从而实现f-SGO纳米片在WPU中优异分散性和防腐性能的平衡。电化学阻抗和动电位极化结果表明，添加适量的f-SGO可大大提高WPU杂化材料的防腐性能。本研究为GO在水性涂料中的应用提供了新思路。
