INVESTIGATION OF SOME SURFACE CHANGES OCCURRING AFTER BLEACHING TREATMENT ON AYOUS (Triplochiton scleroxylon K. Schum) WOOD

Öz

Oxalic acid (C2H2O4), hydrogen peroxide (H2O2), and sodium hydroxide (NaOH) chemicals are widely used in the bleaching industry. This research examined alterations in colour parameters, glossiness values, and the whiteness index (WI*) values following the application of bleaching agents, namely C2H2O4 and H2O2 + NaOH solutions, on ayous (Triplochiton scleroxylon K. Schum) wood. A control group was established to compare the treated surfaces. The results indicate that variance analyses revealed significant differences across all tests concerning the type of bleaching chemical used. The application of bleaching chemicals resulted in increases in WI* values in both directions. The ΔE* values were determined to be 2.21 when using the C2H2O4 chemical and 12.01 with the H2O2 + NaOH chemicals. It was determined that glossiness values decreased in both directions at 60 and 85 degrees. In addition, increases were observed in L* and ho values, while decreases were obtained in C* and a* values. It was observed that the surface properties of ayous wood changed with the chemicals used in the study.

Anahtar Kelimeler

• Bleaching
• oxalic acid
• glossiness
• ayous
• hydrogen peroxide
• colour
• white index
• sodium hydroxide

Ayous (Triplochiton scleroxylon K. Schum) ahşabında ağartma uygulaması sonrasında meydana gelen bazı yüzey değişimlerinin araştırılması

Öz

Oksalik asit (C2H2O4), hidrojen peroksit (H2O2) ve sodyum hidroksit (NaOH) kimyasalları, ağartma endüstrisinde yaygın olarak kullanılmaktadır. Bu araştırma, ağartma maddeleri olan C2H2O4 ve H2O2 + NaOH çözeltilerinin Triplochiton scleroxylon K. Schum (ayous) ahşap üzerine uygulanmasının ardından renk parametrelerinde, parlaklık değerlerinde ve beyazlık indeksi (WI*) değerlerinde meydana gelen değişiklikleri inceledi. İşlenmiş yüzeyleri karşılaştırmak için bir kontrol grubu oluşturuldu. Sonuçlar, kullanılan ağartma kimyasal türü açısından tüm testlerde anlamlı farklılıkların olduğunu ortaya koymuştur. Ağartma kimyasallarının uygulanması, her iki yönde WI* değerlerinde artışlara neden olmuştur. ΔE* değerleri, C2H2O4 kimyasalı kullanıldığında 2.21, H2O2 + NaOH kimyasallarıyla kullanıldığında ise 12.01 olarak belirlenmiştir. Parlaklık değerlerinin her iki yönde de 60 ve 85 derecede azaldığı gözlemlenmiştir. Ayrıca, L* ve ho değerlerinde artışlar görülürken, C* ve a* değerlerinde azalmalar elde edilmiştir. Araştırmada kullanılan kimyasalların ayous ahşabının yüzey özelliklerinde değişikliklere neden olduğu gözlemlenmiştir.

Anahtar Kelimeler

• Ağartma
• oksalik asit
• parlaklık
• ayous
• hidrojen peroksit
• renk
• beyazlık indeksi
• sodyum hidroksit

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