Abstract
ABSTRACT The purpose of this study is to determine the varnish layer hardness and varnish adhesion strength of the varnished Crimean juniper (Juniperus excelsa M. Bieb.) wood growing naturally in the Kastamonu region of Turkey. Test samples were varnished with UV-resistant polyurethane alkyd resin high gloss varnish (PAV) and water-based acrylic resin gloss varnish (WBAV). The varnish adhesion strength test was carried out by using universal testing machine. The varnish layer hardness was measured by using Konig pendulum hardness tester. Additionally, the colour properties were measured by spectrophotometer equipment that used the L*a*b* colour space. The adhesion strength of the polyurethane varnish and the water-based varnish were determined 2.81 MPa and 2.25 MPa respectively. Surface hardness value for water-based varnish and polyurethane varnish were determined 71 and 25 oscillation respectively. Detecting the performance of polyurethane and water-based varnish applications for the Crimean juniper wood will provide guidance in which type of varnish will be better for finishing. As a result, in varnish applications of the wood, it is recommended that water-based acrylic varnish should be applied when surface hardness is required. In addition, polyurethane alkyd varnish should be applied when better surface adhesion strength is desired.
Highlights
Wood materials have always been one of the most preferred products some sectors such as furniture industry, buildings, fibreboard, particleboard, plywood, paper industry etc., there are alternatives
The samples were prepared in dimensions of 100x100x15mm from these timbers for the use in the measurement of varnish adhesion strength, varnish layer hardness and colour difference
This paper argued that determining the varnish layer hardness and varnish adhesion strength of the varnished Crimean juniper
Summary
Wood materials have always been one of the most preferred products some sectors such as furniture industry, buildings, fibreboard, particleboard, plywood, paper industry etc., there are alternatives. Limited resources of forests and increased consumption depend on developments in technology cause a decrease in the forest resources day by day. To overcome this issue, these materials should have been coated by varnishes and paints in order to ensure longterm use. Wood materials may be exposed to mechanical effects such as abrasion and shock, physical effects such as dust, light, temperature, dirt and oil, chemical effects such as acids, bases, oxidation of air and cleaning products. Almost all physical and mechanical properties of wood materials decreases when exposed to outdoor conditions without any protection measures (Pelit; Korkmaz, 2017)
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