Low-cost natural binder for particleboards production: study of manufacture conditions and stability

• Published in: International journal of adhesion and adhesives Vol. 93; no. C; p. 102325
• Main Authors: Ferreira, A.M., Pereira, J., Almeida, M., Ferra, J., Paiva, N., Martins, J., Magalhães, F.D., Carvalho, L.H.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-09-2019; Elsevier BV; Elsevier
• Subjects: Adhesives for wood; Bioadhesive; Bond strength; Bonding strength; Low cost; Pressing; Stability; Water based; Wheat; Wood and wood composites; Adhesives for wood; Bioadhesive; Water based; Wood and wood composites
• ISSN: 0143-7496; 1879-0127
• DOI: 10.1016/j.ijadhadh.2019.01.019

Nowadays, the majority of adhesives used in particleboards (PB) manufacture are formaldehyde-based. In the present research work a low-cost bioadhesive, based on the combination of thick spent sulfite liquor (TSSL) with wheat flour, was tested for the production of three-layer particleboards, at different conditions (particleboards target density, pressing time, pressing temperature, wood type and binder age). It was possible to produce particleboards with densities ranging from 682 kg m−3 to 783 kg m−3, at pressing temperatures from 180 to 210 °C, and pressing times between 8 and 10 min. All the particleboards produced in these conditions were in accordance with the internal bond strength requirements of standard EN 312 for particleboards type P2 (0.35 N mm−2). The best result (0.69 ± 0.01) N mm−2 was obtained for particleboards pressed for 10 minutes at 200 °C with the recycled wood mix. Regarding resin stability, the particleboards manufactured with the binder, stored for 30 days, presented good internal bond strength ((0.58 ± 0.02) N mm−2), above the requirements of standard EN 312 for particleboards type P2.