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Polymers 2018, 10(10), 1070;

Biosourced Binder for Wood Particleboards Based on Spent Sulfite Liquor and Wheat Flour

LEPABE—Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
ARCP—Associação Rede de Competência em Polímeros, Rua Júlio de Matos, 828 4200-455 Porto, Portugal
Euroresinas—Industrias Químicas S.A., Plataforma Industrial de Sines, 7520-064 Sines, Portugal
DEMad—Departamento de Engenharia de Madeiras, Instituto Politécnico de Viseu, Campus Politécnico de Repeses, 3504-510 Viseu, Portugal
Author to whom correspondence should be addressed.
Received: 31 July 2018 / Revised: 24 September 2018 / Accepted: 25 September 2018 / Published: 27 September 2018
(This article belongs to the Collection Polymeric Adhesives)
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Currently, the majority of binders used in wood particleboard (PB) manufacturing are formaldehyde-based synthetic resins. Because of the toxicity of formaldehyde, there is a strong demand for eco-friendly alternatives with similar performances and economic viability. In this work, thick spent sulfite liquor (TSSL), an industrial byproduct from sulfite pulp mills, is proposed as a binder for fully bio-based PBs. The results showed that PBs bound with TSSL present appropriate mechanical performance, which was further improved when TSSL was combined with wheat flour at an 84:16 dry weight ratio and preheated to 94 °C prior to application. For 13.2% binder content per dry wood weight, the PB internal bond strength was 0.46 N mm−2, which is above the standard requirements for PB type P2 (0.35 N mm−2). Optical microscopy showed that TSSL hinders the gelatinization of starch granules during preheating, allowing the binder mixture to maintain a low viscosity suitable for combination with wood particles and PB production. View Full-Text
Keywords: bioadhesives; wood composites; spent sulfite liquor; wheat flour bioadhesives; wood composites; spent sulfite liquor; wheat flour

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ferreira, A.M.; Pereira, J.; Almeida, M.; Ferra, J.; Paiva, N.; Martins, J.; Magalhães, F.D.; Carvalho, L.H. Biosourced Binder for Wood Particleboards Based on Spent Sulfite Liquor and Wheat Flour. Polymers 2018, 10, 1070.

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