Lignin-based adhesives and a process for the preparation...

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 197/02 (2006.01) C08L 97/02 (2006.01) C09J 197/00 (2006.01) D21J 1/00 (2006.01)

Patent

CA 2277285

The invention concerns a lignin and/or carbohydrate-based adhesive binder for fiber boards, particle boards and similar wood-based products, comprising a foamed mixture of an aqueous suspension of lignin and/or carbohydrates obtained from a process of pulping lignocellulosic materials, the mixture being foamed to 1.1 to 10 times the volume of the liquid mixture and the density of the foam being 0.1 to 0.9 kg/l, and the medium foam bubble diameter 0.01 to 0.05 mm. The invention also concerns a method of preparing lignin and/or carbohydrate-based adhesive binders for wood-based products, as well as particle boards, fiber boards or similar wood-based products comprising wood particles, flakes or fibres mixed with the adhesive binder. By foaming the adhesive, an even dispersion of the solids is provided, which improves the quality of the products and gives rise to substantial savings in adhesive use.

Liants adhésifs à base de lignine et/ou d'hydrates de carbone pour panneaux de fibres, panneaux de copeaux et autres produits analogues à base de bois, renfermant un mélange mousseux de suspension aqueuse de lignine et/ou d'hydrates de carbone, qui résulte d'un processus de délignification des matières lignocellulosiques, sachant que le volume du mélange formé en mousse représente entre 1,1 et 10 fois le volume du mélange liquide, que la densité de la mousse est comprise entre 0,1 et 0,9 kg/l et que le diamètre moyen des bulles de mousse oscille entre 0,01 et 0,05 mm. On décrit encore : procédé visant à fabriquer des liants adhésifs à base de lignine et/ou d'hydrates de carbone pour produits à base de bois, ainsi que panneaux de copeaux, panneaux de fibres ou autres produits à base de bois renfermant des fragments, des copeaux ou des fibres de bois mélangés avec le type de liant adhésif considéré. En soumettant l'adhésif à un processus de formation mousseuse, on obtient une dispersion uniforme des matières solides, ce qui améliore la qualité des produits et conduit à des économies substantielles dans l'utilisation des quantités d'adhésif.

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