Gluten Protein Adhesives for Wood Panels

Abstract

Adhesives for wood particleboards based on hydroxymethylated or glyoxalated hydrolysed gluten protein with addition of an equal proportion of tannin/hexamine resin or without any addition of synthetic resins are shown to yield results satisfying the relevant standard specifications for interior wood boards. Even better are resins based on hydroxymethylated or glyoxalated hydrolysed gluten protein to which has been added a small proportion of an isocyanate (pMDI). Adhesive resins formulations based on the latter in which the total content of natural material was either 70% or 80% of the total resin solids content gave good results. Resins based on the former in which the natural material content was approximately 90-95% also gave good results. The 30/70 pMDI/hydroxymethylated lignin adhesive formulation was tried at progressively shorter pressing times yielding internal bond strength results acceptable for relevant interior grade standards at industrially significant pressing times.

Development of sustainable bio-adhesives for engineered wood panels – A Review

“…Wheat gluten, as well as hydrolyzed gluten proteins have been studied as adhesives for wood-based panels. 53,62,63…”

Mild gluten separation – A non-destructive approach to fine tune structure and mechanical behavior of wheat gluten films

“…Commercial WG has been processed into bio-based materials of various types e.g., films, adhesives, and foams (Blomfeldt et al, 2011;Lei et al, 2010;Ullsten et al, 2009). The WG-based materials have demonstrated attractive functional properties, such as oxygen barrier for films and fire retardant and dripping resistance properties for foams (Blomfeldt et al, 2012;Ullsten et al, 2009;Wu et al, 2014).…”

Evaluation of single cell protein from yeast for the development of wood adhesives

“…Other researchers have reported similar results for composites with commercial adhesives, or those mixed with tannin, lignin, and vegetable proteins (Amaral-Labat Lagel et al 2014;Lei et al 2010;Mansouri et al 2011;Moubarik et al 2010;Navarrete et al 2010). Adhesives based on SCPey promote an increase of rigidity for wood-adhesive composites in the presence of wood, just like UF and adhesives based on isolated soy flour, which indicates that it boosts the adhesive-adhesive and adhesive-wood interaction, promoting adherence to the system.…”