| The soy protein-based adhesive wood-based panels’ aging resistance properties affect their service life directly. So the study on the aging resistance properties and the associated factors has important theoretical and practical significance in the modification and application of soy protein-based adhesive and improve the quality of the resulted panels. In this paper, the methods of wet-dry cycling aging, climate box accelerated aging and natural aging were used to treat the specimens bonded by soy protein-based adhesive. The plywood aging resistance properties were characterized by bond strength. The results are as follows:(1) After 8 cycles of WD1, WD2 andWD3 aging the decrease rates of surface and core layer bond strength of the SM/EP specimens are, respectively:WD1:26.05% and 34.86%, WD2:19.33% and 27.52%, WD3:55.46% and 75.23%. And the three groups of experiment results all show that the SM/EP specimens are both superior to the MUF adhesive (melamine content 4%) in boiling water resistance and aging resistance.(2) In a worm and moist environment, the SM/EP specimens are easy to be corroded by mold and 30 days after, the bond strength was decreased to 0 MPa.(3) The SM/EP specimens’ aging degree after a year’s outdoor aging is consistent with that after 2 aging cycles of WD1. After 2 years’ outdoor aging, the surface and core layer bond strength of the SM/EP specimens are decreased by 17.65% and 19.27%, respectively. The aging resistance is superior to the MUF (melamine content 4%) plywood.(4) Epoxy resin (EP) can help to increase the crosslinking density of soy protein-base adhesive and its toughness and ductility, then to improve the water resistance and aging resistance. |
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