Document Type : Research Paper
Authors
- Mohammad Reza topa esfandiyari 1
- Mohammad Talaei poor 2
- Habibollah Khademi Eslam 3
- Seeyed Ahmad Mirshokraie 4
- Behzad Bazyar 5
1 1- PhD Candidate, Department of Wood and Paper industry, faculty of natural resources and environment, Islamic Azad University, Science and Research Branch, Tehran, Iran
2 2- Associate Professor, Department of Wood and Paper industry, faculty of natural resources and environment, Islamic Azad University, Science and Research Branch, Tehran, Iran
3 3- Professor, Department of Wood and Paper industry, faculty of natural resources and environment, Islamic Azad University, Science and Research Branch, Tehran, Iran
4 Professor, Department of Organic Chemistry and Lignocellulose Materials, Payam Noor University, Tehran, Iran
5 Associate Professor, Department of Wood and Paper industry, faculty of natural resources and environment, Islamic Azad University, Science and Research Branch, Tehran, Iran
Abstract
This study uses the Lignin-Glyoxal adhesive to replace chemical resins with environmental compounds producing plywood. producing plywood, pure Lignin (L.100%), lignin- glyoxal 15% (L.85-G.15), lignin-glyoxal 30% (L.70-G.30) and Urea-formaldehyde (control) were used as adhesive at 160 gr/m2 level. Accompanied with ammonium chloride (1%) as the hardener and wheat flour (30%) as the filler based on the dry weight of the adhesive characteristics of adhesives included solid material percentage, viscosity, specific weight and PH were measured. After producing the laboratory boards, the physical and mechanical properties of samples, such as thickness swelling after 2 and 24 hours of being soaked in water, shear strength, modulus of rupture, and modulus of elasticity were measured. In addition, the groups and bonds in the pure lignin and lignin-gloxal adhesives were identified by Fourier Transform Infrared (FTIR) spectroscopy. The results indicated that the independent effect of adhesive type on the thickness swelling of plywood after 2 and 24 hours was significant. Although the results suggest that modifying the lignin would improve the plywood in all cases, the control boards had better featurers than those made with the Lignin-Glyoxal adhesive.
Keywords
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