Ultraviyole stabilizatörlerin kauçuk esaslı otomotiv sızdırmazlık profilleri üzerindeki etkisi

Yıl 2018, Cilt: 6 Sayı: 1, 240 - 253, 31.01.2018

Sibel Dikmen Küçük , Doç. Dr. Hüsnü Gerengi , Yusuf Güner

https://doi.org/10.29130/dubited.345138

Öz

Kapı, cam, kaput ve
bagaj gibi aracın görünür ve görünmez birçok bölgesinde kullanılan sızdırmazlık
profilleri; sentetik etilen propilen dien monomer (EPDM) kauçuktan
üretilmektedir. Etilen, propilen ve doymamış dien moleküllerinin bu
kombinasyonu, yüksek mekanik özellikler sergiler ve su geçirmez bir yapı
oluşturur. Güneş ışığına maruz kalan görünür bölgede kullanılan sızdırmaz
profillerin yüzeyinde, yüksek yoğunluklu ultraviyole (UV) radyasyonun ve güneş
ışığının etkisiyle, zamanla renk değişimi, çatlama ve lekelenme
gözlemlenebilir. Bu çalışmanın amacı, plastik endüstrisinde yaygın olarak
kullanılan UV stabilizatörlerin EPDM kauçuğunun UV dayanımına olan etkisini
araştırmaktır. UV stabilizatörleri, polimerde meydana gelen kimyasal bağ
kırılımı nedeni ile oluşan serbest radikaller ile tepkimeye girerek veya UV
ışımayı absorbe ederek polimeri UV ışınlarına karşı korur. Mevcut EPDM
formülasyonuna farklı tip ve farklı oranlarda UV stabilizatörler eklenerek EPDM
hamur plakaları oluşturulmuştur. UV stabilizatörlerin EPDM plakaları üzerindeki
etkileri; mekanik testler ve yüksek yoğunluklu güneş ışığı, yüksek yoğunluklu
UV ile yüksek sıcaklık/nem içeren iklim koşullarına sahip ve uluslararası
alanda tanınmış Florida açık hava yaşlanma testi ile ölçülmüştür.

Anahtar Kelimeler

EPDM, UV, UV Stabilizatörler

Effect of ultraviolet stabilizers on rubber-based automotive sealing profiles

Öz

The sealing profiles for many visible
and invisible automotive applications such as doors, windows, hoods and trunks
are made of synthetic ethylene propylene diene monomer (EPDM) rubber. This
combination of ethylene, propylene and unsaturated diene molecules exhibits
high mechanical properties and forms a water-proof structure.  With the progress of time, color change,
cracking and staining can be observed on the surface of the sealing profiles
used on the visible regions exposed to the sun due to the effect of
high-intensity ultraviolet (UV) radiation and sunlight. The aim of this study
was to investigate the effect of the UV stabilizers widely used in the plastics
industry on the UV resistance of EPDM rubber. UV stabilizers protect the
polymers against to UV radiation by reacting with the free radicals that are
formed when a high energy UV photon causes a chemical bond in the polymer to
break or by absorbing potentially destructive UV radiation. Plates of EPDM
rubber were prepared by adding different types of UV stabilizers at different
rates to an available EPDM formula. The effects of the UV stabilizers on the
EPDM plates were measured by mechanical tests and the internationally
recognized Florida outdoor aging test with climate conditions of high-intensity
sunlight, high-intensity UV, and high temperature and humidity levels. 

Anahtar Kelimeler

EPDM, UV, UV Stabilizers

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