Patent ID: 8679593
Filing Date: 2014-03-25
Classification: B05D,C09D

Abstract:
1. A method for coating a static or moving metal substrate with a simple or complex shape, by means of an ultra-thin mineral/organic hybrid coating layer with a thickness comprised between 50 to 500 nm, deposited on the substrate, characterized by the following steps: an aqueous solution consisting of oxide nanoparticles and compounds necessary to obtain basic pH conditions is prepared, an organic compound called a pre-polymer is prepared, resulting from the polycondensation reaction obtained by mixing a compound of a first category selected in the group consisting of a polyamine, a polyalcohol and a mixture of the latter, and a compound of a second category, selected from the group consisting of a polycarboxylic acid, a polycarboxylic anhydride, a polyepoxy, a polyisocyanate and any mixture of at least two of the latter; the viscosity of the pre-polymer is measured in order to determine the state of progression of polymerization; when the viscosity of the pre-polymer reaches a value comprised between 3,000 and 25,000 mPa·s, the pre-polymer is dissolved in said aqueous solution having a pH comprised between 11 and 13; the solution is deposited on the substrate, which is found at a temperature below 50° C., the coated substrate is heated so that the total duration of deposition and drying is less than 10 seconds.