Adhesives, reaction systems, and processes for production of...

C - Chemistry – Metallurgy – 09 – J

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C09J 175/08 (2006.01) B27N 3/08 (2006.01) C08J 5/12 (2006.01) C08L 97/02 (2006.01) C08G 18/22 (2006.01) C08G 18/48 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2686282

Adhesives, reaction systems, and processes for the production of lignocellulosic composites. The reaction system comprises a multi-component adhesive and a lignocellulosic substrate. The lignocelluosic substrate comprises a plurality of lig-nocellulosic adherends and is preferably a mass of wood particles. The multi- component adhesive comprises a multi-functional isocyanate, a hydrophilic polyahl, and an organotransition metal catalyst. The multi-component adhesive is characterized by being formulated into at least two mutually reactive chemical component streams. The process comprises the separate application of the mutually reactive chemical component streams of the multi-component adhesive to the lignocellulosic substrate, followed by form-ing and pressing the adhesive treated substrate under conditions appropriate for curing the adhesive and forming a lignocellulosic composite article. The adhesives, reaction systems, and processes are particularly well suited for the production of oriented strand board (OSB).

L'invention concerne des adhésifs, des systèmes de réaction et des procédés de production de composites lignocellulosiques. Le système de réaction comprend un adhésif multicomposant et un substrat lignocellulosique. Le substrat lignocellulosique comprend une pluralité de supports lignocellulosiques et est de préférence une masse de particules de bois. L'adhésif multicomposant comprend un isocyanate multifonctionnel, un polyahl hydrophile et un catalyseur organométallique de transition. L'adhésif multicomposant est caractérisé par le fait qu'il est formulé en deux flux de composant chimique ou plus qui sont mutuellement réactifs. Le procédé comprend l'application séparée des flux de composant chimique mutuellement réactifs de l'adhésif multicomposant au substrat lignocellulosique, suivi par la formation et la pression du substrat traité par adhésif dans des conditions appropriées pour durcir l'adhésif et la formation d'un article de composite lignocellulosique. Les additifs, les systèmes de réaction et les procédés conviennent particulièrement bien pour la production de panneaux de copeaux de bois orientés (OSB).

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