Abstract
The development of lignin-based anticorrosive epoxy coatings for steel protection is beneficial for both alleviating the fossil resource depletion and value-added utilization of lignin but remains a challenge due to the inherent heterogeneous structure of lignin. Here, we selectively extract the low molecular weight (MW) fraction of a crop residue-derived enzymatic hydrolysis lignin (EHL) through a bioethanol fractionation process and prepare epoxy resin by direct epoxidation of the bioethanol fractionated lignin (BFL). The coatings are then fabricated using 20–100 wt% of BFL-based epoxy resin (LEp) as the commercial epoxy resin substitute. The low MW and high p-hydroxyphenyl content of the BFL offer high solubility and good workability for BFL and LEp during epoxidation and coating production, respectively. Lignin-based coatings with 20–40 wt% LEp exhibit good adhesion property (5B) and superior corrosion resistance, compared to the commercial epoxy coating. Although coating with high LEp concentrations (i.e., 60–100 wt%) resulted in decreased adhesion strength, the coating with 100 wt% LEp still displayed corrosion protection performance comparable to that of the commercial epoxy coating. Overall, this study provides a simple and effective approach to converting lignin to epoxy resins for a wide variety of surface coating applications.
Original language | English |
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Pages (from-to) | 268-277 |
Number of pages | 10 |
Journal | International Journal of Biological Macromolecules |
Volume | 221 |
DOIs | |
State | Published - Nov 30 2022 |
Funding
The authors acknowledge the support of the National Natural Science Foundation of China , No. 51771173 . The authors thank Dr. Scott Renneckar at the University of British Columbia for providing access to the NMR and GPC instruments for lignin characterization. Dr. X. Zhang acknowledges the support from Forest and Wildlife Research Center, Mississippi State University . Work (or part of this work) was conducted by ORNL's Center for Nanophase Materials Sciences by RCA, which is a US Department of Energy Office of Science User Facility. The authors acknowledge the support of the National Natural Science Foundation of China, No. 51771173. The authors thank Dr. Scott Renneckar at the University of British Columbia for providing access to the NMR and GPC instruments for lignin characterization. Dr. X. Zhang acknowledges the support from Forest and Wildlife Research Center, Mississippi State University. Work (or part of this work) was conducted by ORNL's Center for Nanophase Materials Sciences by RCA, which is a US Department of Energy Office of Science User Facility.
Keywords
- Anticorrosive coating
- Bioethanol fractionation
- Direct epoxidation
- Enzymatic hydrolysis lignin
- Epoxy resin
- Steel protection