Preparation and Characterization of Hot-Pressed Peanut Meal and Cold-Pressed Peanut Meal Protein-Based Adhesives for Plywood
[Objective]Hot-pressed peanut meal(HPM)and cold-pressed peanut meal(CPM)were used as raw materials to improve the bonding performance and water resistance through denaturation and crosslinking.[Method]HPM and CPM protein-based adhesives were prepared by two-step method of urea(U)denaturation and polyamide polyamine epichlorohydrin(PAE)resin crosslinking,and their differences in bonding strength,viscosity,functional groups,thermal properties and micro morphology were compared.[Result]Compared with the pure HPM adhesive and CPM adhesive,the dry shear strength of poplar plywood prepared by the denatured and crosslinked HPM and CPM adhesive was increased by 134.1%and 111.4%respectively.The wet shear strength reached the national class I poplar plywood standard and class II poplar plywood.After denaturation crosslinking,the viscosity was increased by 101.5%and 70.5%,the thermal decomposition temperature was increased to 316.44℃and 307.57℃,respectively.And the adhesive prepared by HPM had the most compact surface.[Conclusion]The adhesive prepared by HPM has better bonding strength and water resistance than CPM adhesive,and HPM is more suitable as adhesive raw material than CPM.
plant protein adhesivehot-pressed peanut meal(HPM)cold-pressed peanut meal(CPM)plywoodbonding strengthwater resistance
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