Hardeners for water based floor coating composition is obtained by reacting an epoxy intermediate with a polyamine to form intermediate, while allowing primary amino groups to react off; and reacting intermediate with specific Lewis acid

摘要

Preparing hardeners involves: reacting mixture of epoxidized polyalkylene oxide, epoxidized aromatic hydroxy compound and aromatic hydroxy compound, to form first intermediate having an epoxy value of less than 10%; reacting intermediate with polyamine to form second intermediate, provided that the primary amino groups (1 - 99)% present in second intermediate are allowed to react off; and reacting second intermediate with at least one Lewis acid, with exclusion of optionally amino or hydroxy-substituted alkyl acid, alpha ,beta -unsaturated organic carboxylic acids, and carbon dioxide. Preparation of hardeners (H1) involves: (1) reacting a mixture of at least one epoxidized polyalkylene oxide (a) selected from epoxidized polyethylene oxides, epoxidized polypropylene oxides, and polyethylene propylene oxides; at least one epoxidized aromatic hydroxy compound (b) selected from bisphenol A epoxides, and bisphenol F epoxides; at least one aromatic hydroxy compound (c) selected from bisphenol A and bisphenol F; and optionally, at least one di- or tri-glycidyl ether compound (d) selected from triglycidyl ethers of triols and a diglycidyl ether of diols, to form a first intermediate product (Z1) having an epoxy value of less than 10%; (2) subsequently reacting the intermediate product (Z1) with a polyamine (e) to form a second intermediate product (Z2), provided that the primary amino groups (1 - 99)% present in the intermediate product (Z2) are allowed to react off; and (3) reacting the intermediate product (Z2) with at least one Lewis acid (f) or its sa provided that the Lewis acid is a carbonyl compound, with the exclusion of an optionally amino or hydroxy-substituted alkyl acid of formula R 1-C(=O)-OH , alpha ,beta -unsaturated organic carboxylic acids, and carbon dioxide. R 11-22C saturated, linear or branched alkyl (optionally containing an amino or OH group as substituents in the alpha position to the carbonyl carbon atom) or a C 6H 5 group. Independent claims are included for the following: (1) a clear lacquer or coating composition (C') comprising: the hardener (H1); (2) method (M1) for production of a clear lacquer or coating composition (C1) (preferably floor coating composition), involving: reacting, a polyepoxide compound containing an average of =2 terminal or lateral epoxy groups per molecule (g) with the hardener (H1) in an aqueous medium; and (3) a cured floor coating composition (C1a) comprising: a longitudinal shrinkage of less than 3% in a layer thickness of more than 0.4 mm, as measured at 23[deg]C/50% relative air humidity.