How can we improve the hardness of a DD lacquer? The product is a pigmented 2 pack lacquer.
In the formulation of polyurethane lacquers, the well known principle particularly applies that high hardness is best achieved with strongly branched molecular components with aromatic nuclei. This fundamental rule is of such importance for this class of lacquers because it allows considerable latitude in the isocyanate component (the actual croos-linker) and the polyhydroxyl compounds which react with it.
Particularly advantageous in this respect are the mixed trimers in which aromatic or aliphatic diisocyanates enable the desired hardness to be achieved relatively easily whilst maintaining other properties such as adequate reactivity or light fastness.
Undesirable effects due to pigmentation are unlikely as long as it is not the origin of a catalytic effect or of residual moisture. The solution to the problem is made easier as the potential system components are available commercially.
Improving the Hardness of DD Lacquer
Blog, Updated at: 1:10 PM
