The properties of urea formaldehyde adhesive modified with Red Pine bark tannin

Öz

In this study, the performance properties of urea formaldehyde adhesive modified with red pine bark tannin were investigated. Tannin was obtained by extraction from red pine bark and it was added to the urea formaldehyde adhesive in proportions ranging from 5% to 50% relative to the adhesive's solid content to obtain modified urea formaldehyde adhesive, and the performance properties of this adhesive were revealed. The modified adhesive samples were analyzed for viscosity, solid content, gel time, pH, and free formaldehyde content. Lap Shear tensile strength tests were conducted on beech veneer to determine the wet and dry strength values of the adhesive samples. Additionally, FTIR analysis and microscopic imaging were performed on the modified adhesive samples. As the tannin utilization rate increased, the viscosity and gelation time of the adhesive also increased. The U4 modified adhesive group, with a 15% tannin ratio, had a gelation time of 340 seconds. The amount of free formaldehyde in the adhesive decreased with increasing tannin ratio, with the U5 sample having the lowest value of 0.32% compared to 0.90% in the urea formaldehyde (U1). FTIR analysis revealed peak shifts and broadening in the 1123 cm-1 region, indicating chemical modification and the formation of new bonds in the modified adhesive samples. Additionally, sharpening and clarification were observed at 2972 and 2901 cm-1 peaks.

Anahtar Kelimeler

• Bark
• red pine
• tannin
• urea formaldehyde
• FTIR

Kızılçam kabuk taneni ile modifiye edilmiş üre formaldehit tutkalının özellikleri

Öz

Bu çalışmada kızılçam kabuk taneni ile modifiye edilmiş üre formaldehit tutkalının performans özellikleri ortaya konulmuştur. Kızılçam kabuğundan ekstraksiyon ile tanen elde edilmiş ve bu tanen üre formaldehit tutkalına, tutkal katı maddesine oranla %5-50 arasında katılarak modifiye üre formaldehit tutkalı elde edilmiş, bu tutkalın performans özellikleri ortaya konmuştur. Modifiye tutkal örneklerinin viskozite, katı madde miktarı, jel süresi, pH ve tutkalda serbest formaldehit tayini yapılmıştır. Tüm tutkal örneklerinin ıslak ve kuru dayanım değerlerini ortaya koymak için kayın kaplama kullanılarak Lap Shear çekme dayanımı testleri gerçekleştirilmiştir. Aynı zamanda modifiye tutkalların FTIR analizleri ve yapışma hattının mikroskobik görüntüleri alınarak analiz edilmiştir. Modifiye edilmiş tutkal grupları arasında tanen kullanım oranı arttıkça tutkal viskozite ve jelleşme süresinin arttığı görülmüştür. Tanen oranı %15 olan U4 modifiye tutkal grubunda jelleşme süresi 340 sn. olarak kaydedilmiştir. Modifiye edilmiş tutkalın serbest formaldehit tayini sonuçları incelendiğinde tanen oranının artmasıyla tutkaldaki serbest formaldehit miktarında azalma meydana gelmiştir. En düşük serbest formaldehit değeri U5 örneğinde %0.32 olarak belirlenmiştir. Modifiye tutkal örneklerinde belirlenen 2972 ve 2901 cm-1 piklerinde keskinleşme ve belirginleşme, 1123 cm-1 bölgesindeki tepe noktası kayması ve pik genişlemesi ile örneklerdeki kimyasal modifikasyon ve yeni bağların oluşumu ortaya konulmuştur.

Anahtar Kelimeler

• Kabuk
• kızılçam
• tanen
• üre formaldehit
• FTIR

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