The technological properties of particleboards manufactured with nano additive melamine-formaldehyde adhesive

Öz

In the present study, the effect of nano additives in different ratios added to melamine formaldehyde adhesives on the properties of particleboards was investigated. In this respect, two different nanoclays [organo-modified nanoclays (OMC) and unmodified nanoclays (NC)] and graphene nanoplatelet (GNP) were added to the adhesive at the rate of 1%, 2% and 4%. Along with the physical (thickness swelling and water absorption), mechanical properties (modulus of rupture, modulus of elasticity and internal bond strength), accelerated weathering and fire resistance tests (Limiting oxygen index-LOI) of the board were carried out. According to the results, while there was no significant change in the water absorption values with the use of nano additives, a decrease occurred in the thickness swelling values with the use of GNP. The mechanical properties increased with the use of nano additives. The highest values were obtained from the board groups using 1% GNP. The loss of mechanical resistance values after the accelerated weathering test was reduced with the use of 1% nanoclay and up to 2% GNP. According to LOI test results, the use of 1% and 2% nano additives increased the fire resistance of the boards., The agglomerations were determined in places with the increase in the nano additive ratio in the SEM images.

Anahtar Kelimeler

• nanoclay
• graphene nanoplatelet
• accelerated weathering
• fire resistance.

Nano katkılı melamin formaldehit tutkalı ile üretilen yonga-levhaların teknolojik özellikleri

Öz

Bu çalışmada, melamin formaldehit tutkalına eklenen farklı oranlarda nano katkı maddelerinin yongalevhaların özellikleri üzerine etkisi araştırılmıştır. Bu amaçla tutkal içerisine %1, %2 ve %4 oranlarında iki farklı nanokil [organo modifiye nanokil (OMC) ve modifiye edilmemiş nanokil (NC)] ve grafen nanotoz (GNP) eklenmiştir. Levhaların fiziksel (kalınlık artımı ve su alma) ve mekanik (eğilme direnci, eğilmede elastikiyet modülü ve yüzeye dik çekme direnci) özelliklerinin yanı sıra, yapay yaşlandırma testi sonra mekanik direnç değerlerindeki değişim ve yangına dayanım (LOI) değerleri belirlenmiştir. Elde edilen sonuçlara göre nano katkı kullanımı ile su alma değerlerinde önemli bir değişim olmazken, GNP kullanımı ile kalınlık artış değerlerinde azalma meydana gelmiştir. Nano katkıların kullanımı ile mekanik özellikler ise artmıştır. En yüksek mekanik direnç değerleri %1 GNP kullanılan levha gruplarından elde edilmiştir. Hızlandırılmış yaşlandırma testi sonrası mekanik direnç değerlerindeki kayıp %1 nanokil ve %2’ye kadar GNP kullanımı ile azaltılmıştır. LOI testi sonuçlarına göre, %1 ve %2 nano katkı kullanımı levhaların yangına dayanıklılığını arttırmıştır. SEM görüntülerinde nano katkı oranının artmasıyla yer yer topaklanmalar oluştuğu belirlenmiştir.

Anahtar Kelimeler

• nanokil
• grafen nanotoz
• hızlandırılmış Yaşlandırma
• yangın dayanımı

Kaynakça

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