Application of electrostatic powder coating on wood composite panels using a cooling method. Part 1: Investigation of water intake, abrasion, scratch resistance, and adhesion strength,

Abstract

Powder coating is environmentally friendly and safe in terms of human health and is used especially on home appliances and in the automotive sector. Because of these advantages, recent studies have expanded work on the application of powder coating on non-conductive surfaces. Within the scope of this research, low temperature curing (120 °C to 130 °C) was applied on wood-based composite panels of medium-density fiberboard (MDF), particleboard, and plywood to facilitate conductivity. Epoxy, polyester, and hybrid (epoxy-polyester) types of powder paint and water-based liquid paint (control group) were applied to the surface of materials. Panels coated with the powder coatings were compared to the panels coated with the water-soluble acrylic resin coating. The prepared samples were analyzed for performance properties. The best results for thickness swelling, water absorption, adhesive strength, abrasion, and scratch resistance were found for the plywood coated with water-based liquid paint, MDF coated with polyester-based powder paint, plywood coated with hybrid powder paint, particleboard coated with hybrid powder paint, and plywood coated with epoxy powder paint, respectively.

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

“…Based on these tests, the author came to the conclusion that a thicker coating increases resistance. 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 ].…”

“…The fundamental goal of a topcoat is to guarantee a quality finish. According to reports, the ratios of the materials, the types of resin, and the properties of other additives all affect scratch resistance [ 30 , 38 , 39 ]. An effect of the bonding reaction formed between the coatings and the substrate has been noted, especially in the case of powder lacquers [ 38 ].…”

“…These findings are consistent with tests of waterborne and powder varnish coatings performed on MDF, particleboard, and plywood. According to previous research, a thicker coating leads to improved abrasion resistance [ 38 ]. A second topcoat layer proved to increase the number of revolutions needed to reach the initial point of wear (IP) by 28% in testing of waterborne lacquer coatings on a wood substrate [ 32 ].…”

“…The high near-surface density of MDF boards required only a small amount of varnish to be applied. The porosity of the material was linked to particleboard’s greater resistance [ 38 ]. Researchers looked at several types of wood and reached similar conclusions [ 30 ].…”

“…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 ]. There are few publications in the field of HDF surface finishing despite the great potential for developing HDF as a facing for honeycomb panels.…”