The invention discloses a
soybean protein adhesive film and a preparation method thereof. The
soybean protein adhesive film is prepared from the following raw materials: 6 parts of
soybean protein, 0.1-1 part of an alkalizer, 0.5-5 parts of a
protein denaturant, 1.2-2.4 parts of a
polyol plasticizer and 30-60 parts of a
solvent. The preparation method comprises the following steps: S1, dispersing soybean
protein in a
solvent to form a suspension, adding an alkalizer and a
protein denaturant to obtain a
mixed solution A, and heating and stirring for protein denaturation treatment to obtain a denatured soybean
protein solution; s2, adding a
polyol plasticizer into the modified soybean
protein solution, and uniformly mixing to obtain a film forming solution; s3,
coating a substrate with the film forming liquid to form a wet film; and S4,
drying the wet film to obtain the soybean protein glue film. By reasonably using the basifier, the protein denaturant and the
plasticizer, the
solid content of the soybean protein
adhesive film is improved, so that the prepared soybean protein adhesive film exists in a
solid adhesive film form, the amount of water needing to be evaporated in the
hot pressing process is reduced, and the problem that the
solid content of traditional liquid
soybean meal adhesive is low is thoroughly solved.