Aqueous 2 component PUR systems with improved adhesion and corrosionresistance

摘要

A binder combination based on an aqueous, hydroxy-functional resin dispersion and a polyisocyanate component also contains 0.1-10 wt% of an epoxyalkyl-alkoxy-silane. Binder combinations comprising: (a) 30-95 wt% aqueous, hydroxy-functional resin dispersion, (b) 5-70 wt% polyisocyanate component with a free isocyanate group content of 5-50 wt% and a viscosity (23 degrees C; 40 s<-1>) of 5-10,000 mPa.s and (c) 0.1-10 wt% silane component of formula (I). W = an epoxide group of formula II or III; m = 1-4; n = 2-4; X, Y, Z = 1-30C organic residues, at least one of which is a 1-4C alkoxy group. The molar ratio of OH groups in (a) to NCO groups in (b) = (0.2:1)-(3:1). An Independent claim is also included for a proce for the production of binder combinations by adding component (c) to component (b) and dispersing the mixture in resin dispersion (a