Method for constructing a covering of a substrate and composite material comprising that covering

Abstract

A method for making a composite material comprising at least one substrate and a covering layer applied to the substrate comprises the following steps: —providing a substrate containing a plurality of functional groups which are selected from a group comprising a carboxyl group (—COOH), amino group (—NH2), thiol group (—RSH), hydroxyl group (—OH) or a combination thereof,—mixing approximately from 30 to 70% by weight of a first compound with from 70 to 30% by weight of a second compound until obtaining a first homogeneous solution of said first compound and said second compound,—wherein said first compound is an epoxidized compound comprising at least 1.5 epoxide groups per molecule,—said second compound comprises a polyfunctional compound, preferably a bifunctional or trifunctional compound, preferably selected from a group comprising bifunctional carboxylic acids, trifunctional carboxylic acids, a plurality of carboxylic acids having at least 2 or 3 carboxyl groups, dimer carboxylic acids, trimer carboxylic acids, polyfunctional amines, diamines, triamines or admixtures thereof, applying said first solution to said substrate, subjecting said substrate to for a time period of at least approximately 30 minutes a drying step in order to dry said substrate which is provided with said first solution; subjecting said substrate to a cross-linking step in order to cross-link the substrate by maintaining said substrate at a temperature between approximately 50° C. and approximately 90° C., preferably between approximately 75° C. and approximately 80° C., for such a cross-linking time as to cause an opening reaction of at least a portion of the epoxide groups of said first compound in order to form a bond between said first compound with said second compound and said substrate in the region of at least some of the functional groups of said second compound and said substrate and a bond between said first compound and said substrate in the region of at least some of the functional groups of said substrate.

Dependencies are inferred from the claim text.