Method for providing wooden substrates with high resistance...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/70 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2422596

The invention concerns a method for providing a substrate comprising a wooden surface with a coating having high properties of resistance against attack from chemical products. The invention is characterised in that it comprises steps which consist in: a) adding to an aqueous polyol suspension a composition based on isocyanate(s) and an anionic surfactant having a hydrophilic part comprising an anionic group and a lipophilic part comprising a hydrocarbon radical, said surfactant also including a fragment of polyethylene and/or propylene glycol chain of at least 1, advantageously at least 5, preferably at least 7 ethylenyloxyl and/or propylenyloxyl units, and said isocyanate composition comprising not more than 30 % by volume of surfactant bound to an isocyanate function, to form an isocyanate emulsion in water; b) applying said mixture to the surface of said wooden substrate; c) allowing said isocyanate(s) to react with said polyol to form a polyurethane coating.

Cette invention concerne un procédé pour conférer à un substrat comprenant une surface en bois un revêtement ayant des propriétés de résistance élevées à l'attaque de produits chimiques, caractérisé par les étapes consistant à: a) ajouter à une suspension aqueuse d'un polyol une composition à base d'isocyanate(s) et un agent tensioactif anionique présentant une partie hydrophile comprenant un groupement anionique et une partie lipophile comprenant un radical hydrocarboné, ledit tensioactif comportant également un fragment de chaîne polyéthyléne et/ou polypropylène glycol d'au moins 1, avantageusement d'au moins 5, de préférence au moins 7 unités éthylényloxyles et/ou propylényloxyles, et ladite composition d'isocyanate(s) ne comportant pas plus de 30 % en masse d'agent tensioactif sous forme liée à une fonction isocyanate, pour former une émulsion d'isocyanate(s) dans l'eau; b) appliquer ledit mélange à la surface en bois dudit substrat; c) laisser le(s) dit(s) isocyanate(s) réagir avec ledit polyol pour former un revêtement polyuréthane.

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