Varnish layer hardness of oriental beech (fagus orientalist L.) wood as affected by impregnation and bleaching

Abstract

The impacts of impregnation and bleaching on the varnish layer hardness of Oriental beech (Fagus orientalist L.) wood were investigated. A number of bleaching were applied at 18% concentration for bleaching to both impregnated and unimpregnated specimens of Oriental beech wood. Subsequently, water-based (WB) varnish was coated over the samples and the varnish layer hardness values were determined in accordance with ASTM D 4366-95.All of the chemicals used for bleaching reduced the surface hardness. However, after varnish coating, the hardness of most samples was similar to that of the varnish-coated natural (control) samples.

Impacts of coating with various varnishes after impregnation with boron compounds on the combustion properties of Uludag fir

“…So, varnishing and painting after the impregnation is important for long-term utilization against biotic and abiotic effects photochemical degradation, dimensional changes, biological factors, and fire. 6 Painting and varnishing with water-repellent chemicals after impregnating with boron compounds makes the wood more resistant to environmental conditions. 7 Impregnating with the solution of copper, chrome and salt makes wood more resistant to environmental effects.…”

Impact of impregnation with boron compounds on the surface hardness of varnished wood

“…The hardness values of varnished but unimpregnated samples were lower than those of impregnated and varnished samples. The impregnation materials showed an increasing effect in the hardness values of cellulosic, synthetic, polyurethane, waterborne, acrylic, and acid hardening varnishes at rates of 15,8,6,8, and 9% in boric acid and 9, 3, 10, 11, and 14% in borax, respectively. With the acid hardening varnish, the hardness increased by 7% in boric acid but decreased by 6% in borax.…”

Isıl İşlem Görmüş (ThermoWood) ve Su Bazlı Vernik Uygulanmış Bazı Ağaç Türlerinde Hızlandırılmış UV Yaşlandırmanın Yüzeye Yapışma Direncine Etkisi

“…Emprenye edilen örneklerin absorbe ettikleri çözelti miktarları ve net kuru madde miktarları TS 5723 [10] (Ahşap Koruma-Emprenye Maddesi Nüfuz Derinliğinin Tayini) standardında belirtilen yol takip edilerek aşağıdaki formüllere göre hesaplanmıştır [3,11,12]. [24] yaptığı çalışmasında, değişik harici etkenlere maruz bırakıldığında, en yüksek yapışma direnci değerini Hicson Decor kontrol gurubu örneklerinde, en düşük Cam Cila örneklerinde elde ettiğini; sonuçlar üzerinde sıcaklık, nem, güneş ışığının değişik dalga boyları ve UV radyasyonunun etkili olduğunu ve bunların etki düzeylerinin günün farklı saatleri ile mevsimsel değişikliklere göre farklılaşabileceğini, etkilerinin vernik katmanında genleşmeye sebep olacağı, bu yüzden vernik katmanı ile örnek yüzeyi arasındaki adhezyonu azaltarak yapışma direncinde azalmaya sebep olabileceğini bildirmiştir.…”