Optimization of preparation conditions of soy flour adhesive for plywood by response surface methodology.

摘要

Response surface methodology was applied to optimize the preparation conditions of soy flour adhesive (SFA). A boiling water test was used to assess the wet strength of plywood bound with this adhesive. The effects and interactions of treatment time (X₁), treatment temperature (X₂) and additive amount of acid-salt solution (X₃) on wet strength were investigated. The regression model for the SFA preparation was significant (p<0.0001). X₂ and X₃ had a significant effect on wet strength, whereas the effect of X₁ was insignificant. X₂ and X₃ showed interactions with wet strength. The optimal preparation conditions were: acid-salt solution 3.0 g, treatment time 33 min and treatment temperature 29 degrees C. Under these conditions, the wet strength was 1.18+or-0.08 MPa, which is in agreement with the predicted value (1.11 MPa). An analysis of the Fourier transform infra-red spectroscopy spectra of the SFAs further confirmed the validity of the optimal preparation conditions.