| Metal corrosion brought about a lot of economic losses and many methods were used to protect metal. Among these methods, organic coatings were widely used for metal protection due to their low price and high processibility. Among them, epoxy resin was one of the most widely used painting component due to its good adhesion, high corrosion resistant, mechanical properties and high processibility. However, some hydrophilic chemical groups of curing epoxy, absorbed water from the environment, lead to the decrease of metal shielding performance. So it is necessary to modify epoxy resin to achieve better anticorrosive property. In this paper, epoxy resin was chemically modified with methyltrimethoxysilane(MTMS), phenyltrimethoxysilane(PTMS) andγ-glycidoxypropyltrimethoxysilane(KH560). The chemical structures were determined by FT-IR, 1H NMR. The cured samples, with Polyamide 650 and Polyamide 115 as curing agents, were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and water absorption and adhesion testing. Results showed that methyltrimethoxysilane, phenyltrimethoxysilane andγ-glycidoxypropyltrimethoxysilane successfully grafted epoxy resin and modified epoxy resin possesses better thermal stability, less water absorption than the neat epoxy resin. The properties of PTMS-modified coating are tested, including water absorption 1.41%, contact angle 99.3°and adhesion 1 level, respectively. The surface connecting with base material keeps instinct adhesive property of epoxy resin, while the other side exposed to air exhibits high hydrophobicity that applied as anticorrosion coating. |
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