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

Polymers

卷:10

João Pereira¹  Nádia Paiva²  João Ferra²  Jorge Martins³  AnaM. Ferreira³  LuísaH. Carvalho³  FernãoD. Magalhães³  Margarida Almeida³ 

[1] ARCP—Associação Rede de Competência em Polímeros, Rua Júlio de Matos, 828 4200-455 Porto, Portugal;

[2] Euroresinas—Industrias Químicas S.A., Plataforma Industrial de Sines, 7520-064 Sines, Portugal;

[3] LEPABE—Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

关键词: bioadhesives;    wood composites;    spent sulfite liquor;    wheat flour;   

DOI  :  10.3390/polym10101070

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown