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Theses

Synthetic and natural materials for wood adhesive resins

Abstract : Environment-friendly tannin/lignin and soy protein-based wood adhesive were studied. The feasibility and mechanism to use glyoxal to substitute formaldehyde in relevant formulations was analyzed. The suitable addition percentage was determined. The lab-prepared particleboard procedure was optimized too. The results shown in this work confirmed few aspects: Lignin-based adhesives and glyoxalated soy-based wood adhesives mixed with pMDI and mimosa tannin satisfying the requirements of relevant international standards for the manufacture of wood particleboard were obtained. These lignin-based or soy-based wood adhesives did not use any formaldehyde in their formulation. The performance of these formulations is determined to a great degree by the amount or proportion of the pMDI used. The results proved that the reaction between lignin and glyoxal, soy protein and glyoxal. But for the latter, the hydroxy groups that resulted couldn't condense to a cross-linked structure. Some work has been done on the study of the influence of nano-montmorillonite (MMT) on urea-formaldehyde resin and phenolic resin adhesives. The level of exfoliation of the MMT being mixed with these resins was determined. Some conclusions can be drawn: Na-MMT is completely exfoliated when mixed with UF resins, while it only has some degree of intercalation when added to PF and PUF resins. The addition of small percentages of Na-MMT does not appear to improve much the resins dry performance, while it seems to increase the water resistance of the UF-bonded and phenolic-bond panels.
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  • HAL Id : tel-01748412, version 1

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Hong Lei. Synthetic and natural materials for wood adhesive resins. Other. Université Henri Poincaré - Nancy 1, 2009. English. ⟨NNT : 2009NAN10046⟩. ⟨tel-01748412⟩

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