Qianyu Zhang1,2,#, Shi Chen1,2,#, Long Cao1,2, Hong Lei3, Antonio Pizzi4, Xuedong Xi1,2,*, Guanben Du1,2
Journal of Renewable Materials, Vol., , DOI:10.32604/jrm.2023.029537
Abstract Using non-toxic, low-volatile glyoxal to completely replace formaldehyde for preparing urea-glyoxal (UG) resin
adhesive is a hot research topic that could be of great interest for the wood industry. However, urea-glyoxal (UG)
resins prepared by just using glyoxal instead of formaldehyde usually yields a lower degree of polymerization. This
results in a poorer bonding performance and water resistance of UG resins. A good solution is to pre-react urea to
preform polyurea molecules presenting already a certain degree of polymerization, and then to condense these
with glyoxal to obtain a novel UG resin. Therefore, in this present work, the urea was… More >
Graphic Abstract