Synthesis, structure characterization and application of melamine–glyoxal adhesive resins
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Abstract
To eliminate formaldehyde in melamine–formaldehyde (MF) resins the nonvolatile and nontoxic aldehyde glyoxal (G) was reacted with melamine to prepare novel melamine–glyoxal (MG) resins. These MG resins were synthesized with different M/G molar ratios, and their properties were tested. The liquid and hardened MG resins were characterized, and the oligomers formed and their distribution were determined by 13C NMR and matrix assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS). The energy of activation of cross-linking of the MG resins was found to be higher than for MF resins. This rendered some applications possible, such as MG resins impregnated paper surface overlays and showed such resins limitations as binders for wood particleboard. The MG resins remained stable at ambient temperature for more than 12 days.
Notes
Acknowledgements
This work was carried out in the frame of State Forestry Administration 948 Project (2014-4-40), research projects supported by the National Natural Science Foundation of China (No. 31260160), Key program of Science Foundation of Educational Department of Yunnan Province (No. 2013Z087), and the China Scholarship Council project. This work was also supported by a grant overseen by the French National Research Agency (ANR) as part of the “Investissements d’Avenir” program (ANR-11-LABX-0002-01, Lab of Excellence ARBRE). The second author furthermore thanks the research aid of the Deanship of Scientific Research (DSR), King Abdulaziz University (KAU), Jeddah, Saudi Arabia, under Grant No. 4-130-37-RG.
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