Ti3C2Tx MXene-based functional epoxy resin coating for long-term anti-corrosion/wear

摘要

Two-dimensional Ti3C2Tx MXene, with characteristics of high specific surface area, excellent mechanical properties, high conductivity, abundant and easy-to-control surface functional groups, exhibits great potential in improving the protective performance of waterborne epoxy resin coatings. However, at present, the relevant research is still in its infancy. At present, the challenges that Ti 3C2Tx MXene-based polymer co ating must face can be divided into four aspects: (a) the dispersity and compatibility of Ti 3C2Tx nanosheets in polymer matrix, (b) the high electrical conductivity of Ti 3C2Tx, (c) the alignment direction of Ti 3C2Tx nanosheets in polymer matrix, (d) the single function of Ti3C2Tx[1]. To overcome the above bottlenecks, surface and interface engineering are applied to enhance the long-term anti-corrosion/wear performance of Ti3C2Tx MXene-based epoxy resin coating. Firstly, Ti3C2Tx MXene@MgAl-LDH heterostructure composites (Fig. 1a) were constructed to improve the corrosion/wear resistance properties of epoxy resin. The loaded MgAl-LDH decreased the high electrical conductivity of Ti3C2Tx nanosheets and endowed epoxy resin coating with certain self -healing performance[2]. Then, a novel epoxy coating (f -Ti3C2Tx-ZB@EP) with self-healing function and good wear resistance was designed via incorpo rating with aminofunctionalized Ti3C2Tx loading 2 -methylimidazole zinc salt (ZIF -8) nanocontainer@benzotriazole (f -Ti3C2Tx-ZB) multifunctional composite filler [3]. To achieve the desired performance, electrophoretic deposition technique was utilized to realize the parallel arrangement of Ti3C2Tx MXene nanosheets within epoxy resin coating. Herein, ZIF-8 was grown in-situ on amino-functionalized Ti3C2Tx nanosheets and doped with cerium cations (P+-Ti3C2Tx@ZCe), as shown in Fig.1b. The Ti 3C2Tx-based composite was then parallel arranged within epoxy coating utilizing electrophoretic deposition technique to prepare a novel self-healing intelligent coating (PMX@ZCe)[4]. PMX@ZCe possesses satisfactory corrosion/wear protection performance, thanks to the synergy of good interfacial interaction, parallel -aligned barrier effect and active-passive protection.