Process for multi-layer coating of substrates

摘要

The invention relates to a process for multi-layer coating of substrates which comprises the steps of applying at least two coating layers and curing of the applied coatings with high energy radiation and moisture; wherein at least one of the coating layers is formed from a coating composition comprising a binder system of resin solids wherein the resin has free-radically polymerizable olefinic double bonds and hydrolysable alkoxysilane groups, wherein the resin solids content of the coating composition has an equivalent weight of C=C double bonds of 200-2000 and has a silicon content of 1-10 wt-%, wherein the silicon is bound in alkoxysilane groups and wherein the coating composition contains 10-60 wt. %, relative to the complete coating composition, of polar water-miscible organic solvents with a water solubility at 20° C. of at least 220 g/l and wherein the step of curing of the at least one coating layer comprises irradiation with high energy radiation thereby polymerizing the C=C double bonds via free radical polymerization and exposure to moisture thereby forming siloxane bridges from the alkoxysilane groups.