Upcycling of protein concentrates from industrial byproducts into polyurethane wood adhesives

Wood structures generally rely on synthetic adhesives for their strength and versatility. However, environmental concerns linked to the chemical composition of these adhesives have stimulated the search for more environmentally friendly adhesives. Researchers have explored replacing petroleum-based...

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Bibliographic Details
Published in:Bioresources 2024-02, Vol.19 (1), p.1165-1189
Main Authors: Mary, Alex, Blanchet, Pierre, Pepin, Simon, Chamberland, Julien, Landry, Véronic
Format: Article
Language:English
Subjects:
Adhesives
Bond strength
Chemical composition
engineered wood products
industrial byproducts
Lignin
Macromolecules
mass timber
Mechanical properties
Microbreweries
Milk
Nitrogen
Petroleum
Phenols
Polyols
Polyurethane
polyurethane adhesive
Polyurethane resins
Proteins
Raw materials
Resins
Skim milk
Soybeans
Substrates
Viscosity
Wood
Wooden structures
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Summary:Wood structures generally rely on synthetic adhesives for their strength and versatility. However, environmental concerns linked to the chemical composition of these adhesives have stimulated the search for more environmentally friendly adhesives. Researchers have explored replacing petroleum-based constituents with natural raw materials such as lignins, tannins, and proteins. Of these alternatives, proteins, being biological macromolecules, are recognized for their capacity to enhance adhesion to wood substrates. This study considered the development of protein-based adhesives derived from diverse sources, including soybean meal, microbrewery spent grains, shrimp shells, and skim milk powder. These raw materials were subjected to mild alkaline conditions to yield protein concentrates. The resulting adhesives were formulated at various protein content levels: 5%, 10%, 15%, and 20%. The study’s findings showed that the incorporation of proteins into the polyurethane adhesive system not only can preserve but also augment adhesive performance. This enhancement encompasses deeper penetration into wood substrates and an overall improvement in mechanical strength. These results underscore the promise of proteins as a sustainable alternative to petroleum-based polyols in adhesive formulations.
ISSN:1930-2126
1930-2126
DOI:10.15376/biores.19.1.1165-1189