SOME SURFACE CHARACTERISTICS OF ORIENTAL BEECH WOOD IMPREGNATED WITH SOME FIRE-RETARDANTS AND COATED WITH POLYUREA/POLYURETHANE HYBRID AND EPOXY RESINS

Abstract

This study was made to determine surface characteristics such as colour, gloss, and surface hardness changes of Oriental beech (Fagus orientalis). The wood specimens were firstly impregnated with some fireretardants(FRs) and primed with epoxy resin (EPR) and then coated with polyurethane/polyurea hybrid resin(PUU). Oriental beech was impregnated with 3 % aqueous solution of boric acid (BA), borax (BX), boric acidand borax mixture (1:1), and ammonium sulphate (AS). While Sikafloor®-156 was used for epoxy coating(EPR), Sikalastic®-851 R was used for polyurethane/polyurea hybrid coating (PUU). According to our results,all treatment groups gave negative lightness stability values after accelerated weathering. The colour stabilityof epoxy resin coated Oriental beech was higher than that of polyurethane/polyurea hybrid resin coated Orientalbeech. Except for boric acid impregnated and polyurethane/polyurea hybrid resin coated Oriental beech, allfire-retardants treatment before polyurethane/polyurea hybrid resin and epoxy resin coatings decreased thegloss losses of Oriental beech after accelerated weathering. Fire-retardants impregnation before epoxy resinand polyurethane/polyurea hybrid resin coatings improved the surface hardness values of Oriental beech afteraccelerated weathering