This paper investigates the impact of the top coating on the basic mechanical
properties of a lacquered surface, including indentation hardness, scratch
resistance and abrasion resistance. Three types of the top coating were used,
including a 2K polyurethane coating, a 2K acrylate-isocyanate coating and a
2K alkyd-urethane coating. Samples of two wood species, spruce (Picea abies
Karst.) and oak (Quercus robur L.), were used in this study, in order to
determine whether the wood species, which is not in direct contact with the
top coating, has an impact on the mechanical properties of a lacquered
surface. The samples coated with a 2K acrylate-isocyanate coating showed the
highest values of indentation hardness, in the samples of both wood species
(1.34 N for spruce; 1.4 N for oak). The samples coated with a 2K
alkyd-urethane coating showed the highest values of scratch resistance (20 N
for both wood species) and abrasion resistance (mass loss of 480 mg after 700
cycles for both wood species). The results have shown that the wood species
does not affect the value of indentation hardness, scratch resistance and
abrasion resistance of a lacquered surface.
Few-layer graphene aqueous suspensions for polyurethane composite coatings
