Decay resistance of Oriental beech wood treated with fire retardants and coated with epoxy and polyurea resins

Öz

In this study, it was aimed to improve decay resistance of Oriental beech (Fagus orientalis L.) wood, which is impregnated with fire retardant chemicals such as boric acid, borax, and ammonium sulfate, and coated with epoxy (Sika floor 156) and polyurea (Sikalastic®-851 R) resins against white and brown rot fungi. Firstly, Oriental beech wood samples were impregnated with 3% aqueous solution of boron compounds and ammonium sulfate. Then, coating process with polyurea and epoxy resins was applied to impregnated samples. Afterwards, the samples were exposed to brown rot (Postia placenta) and white rot (Trametes versicolor) fungal attack for 12 weeks for using soil-block test according to ASTM D 1413-07 (2007) standard. Results showed that the weight losses for all impregnated and coated Oriental beech wood samples were lower compared to the control samples. In the study, impregnation of boron compounds before coating statistically significantly increased the decay resistance of the samples against both fungal rot.

Anahtar Kelimeler

• Soil-block test
• Boron compounds
• Ammonium sulphate
• Oriental beech
• Epoxy
• Polyurea

Yanmayı geciktirici maddelerle muamele edilen ve epoksi ile poliürea reçineleriyle kaplanan Doğu kayını odununun çürüklük direnci

Öz

Bu çalışmada, yanmayı geciktirici özellikteki kimyasal maddelerden, borik asit, boraks ve amonyum sülfat ile emprenye işlemi uygulanan ve epoksi (Sika floor 156) ve poliürea (Sikalastic®-851 R) reçineleri ile kaplanan Doğu kayını (Fagus orientalis L.) odununun beyaz ve kahverengi çürüklük mantarlarına karşı direnç özelliklerinin geliştirilmesi amaçlanmıştır. Çalışmada, deney örnekleri borlu bileşikler ve amonyum sülfatın %3’lük sulu çözeltisiyle emprenye edilmiştir. Ardından bu örneklere poliürea ve epoksi reçineleri ile kaplama işlemi uygulanmıştır. Daha sonra örnekler 12 hafta boyunca kahverengi (Postia placenta) ve beyaz çürüklük (Trametes versicolor) mantar saldırılarına maruz bırakılarak, ASTM D 1413–07 (2007) standardına göre toprak blok (soil-block) testi gerçekleştirilmiştir. Elde edilen sonuçlara göre, emprenye ve kaplama işlemi gören tüm deney örnekleri için ağırlık kayıplarının kontrol örneğine göre daha düşük çıktığı belirlenmiştir. Çalışmada kaplama öncesi borlu bileşiklerle emprenye işlemi her iki mantar çürüklüğüne karşı, örneklerin çürüklük direncini istatistiksel anlamda önemli ölçüde artırmıştır.

Anahtar Kelimeler

• Toprak blok testi
• Borlu bileşikler
• Amonyum Sülfat
• Doğu kayını
• Epoksi
• Poliürea

Kaynakça

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