Ultraviyole stabilizatörlerin kauçuk esaslı otomotiv sızdırmazlık profilleri üzerindeki etkisi

Abstract

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.

Keywords

• EPDM
• UV
• UV Stabilizatörler

Effect of ultraviolet stabilizers on rubber-based automotive sealing profiles

Abstract

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. 

Keywords

• EPDM
• UV
• UV Stabilizers

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