Wood Surface Finishing of Selected Invasive Tree Species

Abstract

Due to their strong renewal power, the invasive tree species are spreading rapidly, especially in abandoned agricultural and forest areas and along traffic routes and water courses. One way of their restriction is the promotion of their use. In our research, we investigated surface finishing of wood of five selected invasive species in Slovenia, Box elder (Acer negundo L.), Black locust (Robinia pseudoacacia L.), Horse-chestnut (Aesculus hippocastanum L.), Honey locust (Gleditsia triacanthos L.) and Chinese sumac (Ailanthus altissima (Mill.) Swingle), and compared it with the finishing of the European beech (Fagus sylvatica L.) wood. For coatings, we selected one-component waterborne finish on acrylate-polyurethane basis, one-component solventborne finish on polyurethane basis and tung oil as a natural finish. Several surface properties were investigated. We proved that surface hardness, resistance to impact and adhesion were very much related to interactions between the coating and the substrate, while resistance to cold liquids was only dependant on the type of the finish. It was also shown that, in general, finishing of woods of selected invasive tree species was not problematic. The only exception was Black locust wood on which tung oil cured very slowly.

Quality of Oil- and Wax-Based Surface Finishes on Thermally Modified Oak Wood

“…The impact resistance of a surface finish is influenced by hardness of the substrate as well as the film's brittleness and elasticity. Additionally Pavlič et al [42] recorded the influence of substrate on impact resistance of the coated surfaces. Tesařová et al [43] reported a hypothesis about the relationship between the physical-mechanical properties of lacquers surface finishes and the ultimate tensile stress of free coating films.…”

“…In previous work [27], thermally modified beech wood showed the increased surface hardness of these oil and wax surface finishes. The surface hardness is a property of the coating film, but it was proven that the determined hardness was also influenced by the substrate [42].…”

Mechanical and Chemical Resistance of UV Coating Systems Prepared under Industrial Conditions

“…This is consistent with the information provided on the improvement in quality when more topcoat is applied [ 38 ]. The application of a second layer of topcoat increases a coating’s resistance according to earlier experiments on wood samples with coatings made of numerous layers of waterborne varnishes [ 31 ].…”

“…For each sample, 10 measurements were taken, and the average values were recorded. The color differences were determined with the delta E parameter, which indicates the total color difference [ 31 , 46 , 47 ].…”

“…The hygroscopic properties of the boards are important when forming a bond between the substrate and the coating [ 24 ]. Many studies have been published on the resistance of coatings to mechanical factors and cold liquids on wood surfaces, such as beech ( Fagus sylvatica ), yellow birch ( Betula alleghaniensis ), black alder ( Alnus glutinosa ), oak ( Quercus robur ), turkey oak ( Quercus cerris ), ash ( Fraxinus excelsior ), walnut ( Juglans regia ), box elder ( Acer negundo ), black locust ( Robinia pseudoacacia ), horse chestnut ( Aesculus hippocastanum ), honey locust ( Gleditsia triacanthos ), and Chinese sumac ( Ailanthus altissima ) [ 24 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. The surface resistance of wood-based panels has also been determined: MDF, particleboard, plywood [ 38 , 39 ], melamine-faced chipboard (MFC), and painted panel (Pp) [ 40 ].…”