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  4. Vol 9, Issue 2, 2025

Preparation of Formaldehyde-Free Bio-Based Plywood Adhesive Using Polyvinyl Alcohol and DES-Extracted Lignin Composite

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DOI: 10.23977/erej.2025.090206 | Downloads: 0 | Views: 85

Author(s)

Ruiqi Zhang 1

Affiliation(s)

1 Shenzhen College of International Education, No. 3 Antuoshan 6th Rd., Futian District, Shenzhen, China

Corresponding Author

Ruiqi Zhang

ABSTRACT

The purpose of this paper is to develop a preparation method for a formaldehyde-free, low CO2 emission, and sustainable plywood adhesive. Previous research approached VOC emissions in formaldehyde-based adhesives via additives or VOC absorbents but failed to completely eradicate VOC emission. Lignin, as an abundant biomass feedstock, is a strong candidate for formaldehyde-free sustainable adhesive research. In this paper, three choline chloride-based (ChCl) Deep Eutectic Solvents (DES) were prepared for lignin extraction. ChCl and lactic acid showed the highest lignin solubility at 41.3% weight percentage and was used to extract lignin. The extracted lignin quality was verified using nuclear magnetic resonance. Lignin-polyvinyl alcohol adhesive was then prepared and hot-pressed to produce plywood, which were then subjected to mechanical and rheological testing. The end result was a plywood product that met GB/T 17657-2013 Chinese national standards with adhesive strength of 0.7 MPa. We hope this paper can act as reference for future works concerning formaldehyde-free adhesives.

KEYWORDS

Biomass, Bio-Adhesive, Formaldehyde-Free, Deep Eutectic Solvent, Plywood

CITE THIS PAPER

Ruiqi Zhang, Preparation of Formaldehyde-Free Bio-Based Plywood Adhesive Using Polyvinyl Alcohol and DES-Extracted Lignin Composite. Environment, Resource and Ecology Journal (2025) Vol. 9: 47-59. DOI: http://dx.doi.org/10.23977/erej.2025.090206.

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