Aqueous multi-component polyurethane coating agent, method...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 175/04 (2006.01) B05D 1/36 (2006.01) C08G 18/08 (2006.01) C08G 18/62 (2006.01) C09D 7/12 (2006.01) C09D 175/00 (2006.01)

Patent

CA 2183646

The present invention relates to an aqueous multicomponent polyurethane coating composition comprising A) a water-dilutable polyaddition resin (A1) and/or polycondensation resin (A2) containing hydroxyl and carboxylate groups and having an OH number of from 40 to 200 mg of KOH/g, preferably from 60 to 140 mg of KOH/g, an acid number of from 15 to 100 mg of KOH/g, preferably from 25 to 50 mg of KOH/g, and a glass transition temperature of from -40°C to +60°C, preferably from -20°C to +40°C, B) a polyisocyanate component (B) as crosslinking agent and C) at least one additive, characterized in that it contains as additive a carbodiimide component (C) which has a content of carbodiimide groups -N=C=N- of from 2 to 30% by weight, on average at least 0.8 carbodiimide groups per molecule and from 0 to 25% by weight, based on solids, of chemically incorporated ethylene oxide and/or propylene oxide units which are present within polyether chains, and/or a polyepoxide component (D).

L'invention a pour objet un agent de revêtement multicomposant aqueux, à base de polyuréthanne, renfermant A) une résine de polyaddition (A1) et/ou une résine de polycondensation (A2) diluable à l'eau, présentant des groupes hydroxyle et carboxylate, d'un indice OH de 40 à 200 mg KOH/g, de préférence de 60 à 140 mg KOH/g, d'un indice d'acide de 15 à 100 mg KOH/g, de préférence de 25 à 50 mg KOH/g, et d'une température de transition vitreuse de -40 ~C à +60 ~C, de préférence de -20 ~C à + 40 ~C, B) un polyisocyanate (B) utilisé comme agent de réticulation et, C) au moins un adjuvant, caractérisé en ce qu'il renferme comme adjuvant un carbodiimide (C) contenant 2 à 30 % en poids de groupes carbodiimide (-N=C=N-), une moyenne statistique d'au moins 0,8 groupe carbodiimide par molécule et 0 à 25 % en poids, par rapport au produit solide, de motifs oxyde d'éthylène et/ou oxyde de propylène, incorporés chimiquement dans des chaînes de polyéther, et/ou un polyépoxyde (D).

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