METHOD FOR PREVENTING THE FORMATION OF HARDENERS COMPOUNDS FROM HARDENERS PRECURSORS AND EXTENDING THE PERIOD OF DISPERSION

摘要

The present invention relates to a method for preventing the formation of hardener compounds from hardener precursors in a hermetically sealed aerosol can under pressure containing a paint-forming dispersion, which after sealing the can contains liquefied propellant, epoxy and / or polyurethane resins in the amount of W1, the hardener precursor of the mentioned and / or polyurethane resins in the amount of W3, and the precursors of epoxy or urethane hardeners are selected from the group consisting of imine, enamine, Mannich base, Schiff base, oxazolidine, aldimine and mixtures thereof, unbound water in the amount of W1, and the amount of W1 is in the range of 1-10000 ppm ., and placed inside the said can before its sealing, along with the other mentioned substances that form the dispersion. In the aforementioned invention, the dispersion also contains a catalytic compound, preferably a weak acid, to prevent the formation of amines of an epoxy and / or polyurethane hardener from the precursors of the said epoxy and / or polyurethane hardener, as a result of the said catalytic compound shifting the equilibrium of the reversible reaction (2a) between unbound water in the aforementioned dispersion and the precursor of the epoxy and / or polyurethane hardener back to the formation of the said initial precursors of the epoxy or polyurethane hardener, and the said reversible reaction (2a) occurs during the entire storage time of the dispersion in an airtight container.