The Inhibition Effects of Wood Light Induced Discoloration Coating with Water-Based Acrylic Varnish

Abstract

In this paper, we used water-based acrylic varnish to coat poplar and pinus sylvestris veneer, discussed the inhibition effects of veneer light induced discoloration with two coating ways which were paint coating and film covering. The result showed that, after paint coating or film covering, the lightness aberration of veneer ΔL* and chromatism ΔE*ab were significantly reduced. The inhibition rate of veneer light induced discoloration with film covering was 7.88% higher than that with paint coating, reaching 30.41%.It mainly because of the small change of color index b* of film covered veneer, the water-based varnish film to a certain extent could inhibit the wood photochemical consequences by ray radiation. It’s feasible to study light induced discoloration of coated veneer by the method of film covering.

COATING PERFORMANCES OF CRIMEAN JUNIPER (Juniperus excelsa M. BIEB.) WOOD

“…In an analysing of colour changes, Söğütlü and Döngel (2009) observed that when cellulosic, synthetic, polyurethane and acid-catalysed varnishes were applied to oak, east beech, chestnut and Scotch pine woods, the most colour changes occurred in synthetic varnished samples. Liu et al (2012) stated that poplar and scots pine (Pinus sylvestris L.) veneer samples coated with water-based acrylic varnish. They found that the lightness aberration of veneer (ΔL*) and chromatism (ΔE* ab) significantly reduced.…”