ABSTRACT With the growing awareness of petroleum resource depletion, the development of bio‐based composites derived from renewable resources has attracted significant attention. In this study, a bio‐based epoxy curing agent, namely xylose‐based aldehyde amine (XAA), was synthesized via the Mannich reaction and subsequently employed to cure E901 epoxy resin for the preparation of xylose‐based epoxy coating systems (XAAF and XAAC). The successful synthesis of XAA was confirmed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR). The properties of xylose‐based epoxy coating systems prepared at different Mannich reaction temperatures were systematically evaluated. Among the as‐fabricated epoxy coating systems, XAAF‐70 possessed the optimal mechanical properties, with a tensile strength of 56.7 MPa and an elongation at break of 8.8%. Meanwhile, XAAC‐70 showed superior performance, including a 5B adhesion grade, 4H pencil hardness, as well as superior impact resistance (front impact: 120 cm; reverse impact: 110 cm). Notably, XAAC‐50 exhibited satisfactory corrosion resistance, with |Z| 0.01 Hz exceeding 10 6 Ω cm 2 after various immersion durations in the 3.5 wt% NaCl solution. Overall, this study presents an effective approach for converting xylose into an epoxy curing agent suitable for surface coating applications.
Ye et al. (Thu,) studied this question.