Doğal Kauçuk (NR)/Akrilonitril Bütadien Kauçuk (NBR) Karışımlarının Yağ Direnci Özelliklerinin İncelenmesi

Abstract

Günümüzde endüstride önemli bir yere sahip olan kauçuk esaslı ürünler ayakkabıdan otomobil lastiklerine tekstil ürünlerinden kırtasiye malzemelerine kadar geniş bir alanda kullanılmaktadırlar. Yağ dayanımı kauçuk malzemelerin kullanım alanını etkileyen en önemli faktörlerden birisidir. Bazı kauçuklar yağın içerisinde ve çevresinde çalışabilirken bazıları bozularak ve arızalanarak ekonomik olarak kayba neden olacaktır. Uygun seviyede yağ direncine sahip özellikleri geliştirilmiş doğru malzeme seçimi önem arz etmektedir. Bu çalışmada farklı doğal kauçuk (NR) ve nitril bütadien kauçuk (NBR) oranlarına sahip (100:0, 80:20, 70:30, 60:40, 50:50) NR/NBR karışımları hazırlanarak kürlenme ve şişme özelliklerine NBR kauçuğunun etkisi değerlendirilmiştir. NR kauçuğuna ilave edilen NBR kauçuğunun ilk pişme zamanını (ts2) %22.4 oranında, optimum pişme zamanını (t90) %15.7 oranında artırdığı, maksimum (MH) ve minimum (ML) tork değerlerini ise sırasıyla %5.9 ve %2.7 oranlarında azalttığı gözlenmiştir. NR kauçuğunun IRM901 yağındaki şişme oranı 50phr NBR ilavesi ile %58.4 oranında azalmıştır. NR kauçuğunun IRM903 yağındaki %99 olan şişme oranı 50NR/50NBR kauçuğunda %66.7 oranında azalarak %33 olarak elde edilmiştir. Yağ direnci düşük olan NR kauçuğuna ilave edilen NBR kauçuğunun yağ direncini önemli oranda artırdığı gözlenmiştir.

Keywords

• NR
• NBR
• Şişme özellikleri
• IRM901
• IRM903

Investigation of Oil Resistance Properties of Natural Rubber (NR)/Acrylonitrile Butadiene Rubber (NBR) Blends

Abstract

Rubber-based products, which hold a significant place in today’s industry, are used in a wide range of areas from shoes to automobile tires and from textile products to stationery supplies. Oil resistance is one of the most crucial factors affecting the application areas of rubber materials. While some rubbers can perform effectively in environments with oil, others may degrade and fail, leading to economic losses. The selection of the correct material with developed properties for suitable oil resistance levels is of great importance. In this study, NR/NBR blends with different natural rubber (NR) and nitrile butadiene rubber (NBR) ratios (100:0, 80:20, 70:30, 60:40, 50:50) were prepared and the effect of NBR rubber on curing and swelling properties was evaluated. The addition of NBR rubber to NR rubber was observed to increase the curing time (ts2) by 22.4%, the scorch time ( t90) by 15.7%, and decreased the maximum (MH) and minimum (ML) torque values by 5.9% and 2.7%, respectively. The swelling ratio of NR rubber in IRM901 oil decreased by 58.4% with the addition of 50 phr NBR. The swelling rate of NR rubber in IRM903 oil, which was 99%, was reduced by 66.7% in 50NR/50NBR rubber, resulting in 33%. It was observed that the addition of NBR rubber to NR rubber, which has low oil resistance, significantly increased its oil resistance.

Keywords

• NR
• NBR
• Swelling Properties
• IRM901
• IRM903

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