Waterborne Varnishes Research Articles

English

In this study, the color effects of wood materials to coloring with different application methods (brush, roller sponge and spray gun) and waterborne varnishes were investigated according to ASTM-D 2244. For this purpose, the experimental samples of Scots pine (Pinus silvestris L.), oriental beech (Fagus orientalis L.) and oak (Quercus petreae L.), which are commonly used woods in the carpentry and furniture industry in Turkey, were prepared and varnished with one and two-pack waterborne varnishes in accordance with ASTM D 3023. According to the result of the research, significant color changes in coloring as red and yellow tones on the sample surfaces of varnished wood materials were found. The highest color change was obtained in the samples of oak, when varnished with brush and spray gun while the lowest value was obtained in roller sponge in respect to the application methods for waterborne varnishes. However, the application method of spray gun for self crosslinked polyurethane, topcoat-clear, (SCPt) gave the highest metric chroma value among the three different application methods.

Wodorozcienczalne epoksydowe kompozycje powlokowe z samoemulgujacymi utwardzaczami aminowymi

Three waterborne varnish compositions and epoxy coatings prepared of liquid bisphenol A - based epoxy resin "Epidian 6" and self-emulsifying hardeners (amine adduct type) were investigated. The effects of hydrophilicity of the hardeners used on the technological properties (fluidity, pot life, drying time - Table 1) and useful ones (adhesion, scratch resistance and water uptake - Table 2) of the coatings on the steel substrate, after curing at room temperature, were determined.