Tag Archives: Bio-resin

679–688 P. Alao, M. Tobias, H. Kallakas, T. Poltimäe, J. Kers and D. Goljandin
Development of hemp hurd particleboards from formaldehyde-free resins
Abstract |
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Development of hemp hurd particleboards from formaldehyde-free resins

P. Alao¹, M. Tobias¹, H. Kallakas¹, T. Poltimäe¹, J. Kers¹ and D. Goljandin²

¹Laboratory of Wood Technology, Department of Material and Environmental Technology, Ehitajate tee 5, EE19086 Tallinn, Estonia
²Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Ehitajate tee 5, EE19086 Tallinn, Estonia
*Correspondence: percy.alao@taltech.ee

Abstract:

Low density of hemp hurd (Cannabis Sativa L), better end of life impact, performance comparable to wood chips and low energy requirement for cultivation make it a suitable alternative raw material for particleboards (Pb). However, due to concerns about sustainability and formaldehyde emissions, it is essential to develop the new bio-based resins from renewable resources. In this research, the mechanical and physical properties of Pb produced from hemp hurds (HH) and a variety of resins: Urea-formaldehyde (UF), formaldehyde-free acrylic resin (Acrodur®) and bio-based soy resin (Soyad™) were compared to those of wood particles (WP) bonded with UF. The results indicate that boards from HH are generally lighter than WP with a 5.6% variation between HH+UF and WP+UF. Hemp boards based on soy-resin showed higher tensile performance, with an average of 0.43 MPa compared to the 0.28 MPa and 0.24 MPa of (HH+UF) and (WP+UF) respectively. Nevertheless, thickness swelling (TS) of HH+UF (27%) was the least, while there was no significant difference in the water absorption (WA) compared to HH+Soyad4740, both were still lower than that of WP+UF. The overall outcome shows that bio-based soy resin can be a suitable alternative to UF as a binder in Pb production.

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