Bio-based thermoset resins for bonding and eco-friendly preservation in the wood industry

IRG/WP 13-40650

C Motillon, A Allal, A Visse, F Charrier, B Charrier, A Baldé

Yellow dextrins and tannins were used in wood adhesives formulation to substitute resins based on formaldehyde. Several formulations were carried out in alkaline aqueous media by varying the weight fraction of two compounds from 10% to 30%. The cross-linking was performed using epichlorohydrin as a reticulant agent. Rheological behaviours and initial adhesion of three liquid formulations, before reticulation, were carried out by probe tack test and Rheology to validate its process ability. The cross-linking of epichlorohydrin with yellow dextrins and tannins was highlighted in this study. The cross-linking was analyzed by Fourier transformed infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and by biodegradation of reticulated resins. Mechanical properties of resins were analyzed by shear strength test on plywood. Depending on formulations, results confirmed the high potential of yellow dextrins and tannins reticulated by epichlorhydrin, to glue wood. Moreover, the biodegradation tests of cross-linked samples showed that the network constituted by dextrins and tannins are resistant to fungal attack.

Keywords: wood adhesives, thermoset resin, dextrins, tannins, epichlorohydrin

Conference: 13-06-16/20 Stockholm, Sweden

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