Abstract
The present study provides a comprehensive discussion on the structure and properties of a novel high-strength rapeseed protein-based adhesive, which effectively mitigates the emission of free formaldehyde in conventional wood-based panels used as adhesives. The rapeseed protein (R) extracted from rapeseed cake was integrated with glyoxalde-urea (UG) resin to prepare rapeseed protein-based adhesive (RUG). The structure of RUG was characterized by FTIR, XPS, 13C NMR, etc. The results indicate that RUG with good performance can be obtained by reacting at 80 °C for 1 h with G/U molar ratio of 2.0 and a system pH of 5–6. When preparing plywood, a small quantity of diphenylmethane diisocyanate (MDI) is introduced into the system as a crosslinking agent to further enhance the strength of the plywood. The results showed that when the amount of MDI is 3 % of the total mass of the RUG adhesive, the bonding strength of the RUG adhesive has been greatly improved, and the performance of the prepared plywoods meets the requirements of GB/T 9846-2015 for Class II plywood. The study provides a comprehensive discussion on the structure and properties of a novel high-strength rapeseed protein-based adhesive, which provided a reference for replacing formaldehyde-based adhesives.
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