Investigating Mechanical Strength of Epoxy/SiO2 Superhydrophobic Coatings Prepared by Spray Coating Method

Abstract

Superhydrophobic coatings, in addition to their many advantages, have the potential to be used in aircraft due to weak adhesion force formation between the ice and the surface, delaying and reducing icing. Today, although superhydrophobic surfaces can be produced using many methods, these surfaces cannot maintain their water-repellent properties for a long time under outdoor conditions. In this study, the relationship between the production parameters and mechanical abrasion resistance of superhydrophobic coatings prepared by the spray coating method was investigated. Two different mechanical strength tests were used to examine the usability of the coatings in outdoor conditions. The impact resistance of the surfaces was examined by the sand impact durability test and the abrasive wear resistance by the linear abrasion stability test. The mechanical strength of the surfaces shows significant differences depending on the production parameters. Epoxy/Polydimethylsiloxane/SiO2 surfaces containing certain amounts of polydimethylsiloxane and SiO2 nanoparticles exhibit superior water repellent and mechanical durability properties. Spraying time has a significant effect on the mechanical wear behavior of surfaces. Coatings with a short spraying time exhibit high abrasive wear resistance, while coatings produced with a long spraying time maintain their water-repellent properties for a long time under dynamic impacts.

Keywords

• epoxy
• silica
• superhydrophobic
• spray coating
• mechanical strength

Sprey Kaplama Yöntemi ile Üretilen Epoksi/SiO2 Süperhidrofobik Kaplamaların Mekanik Dayanımlarının İncelenmesi

Öz

Süperhidrofobik kaplamalar sahip oldukları birçok avantajın yanı sıra buz ile yüzey arasında zayıf adhezyon kuvveti oluşumu, buzlanmayı geciktirme ve buzlanmayı azaltma özellikleri nedeniyle hava araçlarında kullanım potansiyeli taşımaktadırlar. Günümüzde süperhidrofobik yüzeylerin çok sayıda yöntem kullanılarak üretilebiliyor olmasına karşın bu yüzeyler dış ortam koşullarında su iticilik özelliğini uzun süre koruyamamaktadır. Bu çalışmada, sprey kaplama yöntemi ile hazırlanan süperhidrofobik kaplamaların üretim parametreleri ile mekanik aşınma dayanımları arasındaki ilişki incelenmiştir. Kaplamaların dış ortam koşullarında kullanılabilirliğini incelemek amacıyla iki farklı mekanik dayanım testi kullanılmıştır. Yüzeylerin darbe dayanımı düşen kum aşınma testi, teğetsel aşınma dayanımı ise doğrusal abrazif aşınma testi ile incelenmiştir. Yüzeylerin mekanik dayanımı üretim parametrelerine bağlı olarak önemli farklılıklar göstermektedir. Belirli miktarlarda polidimetilsiloksan ve SiO2 nano partikül içeren Epoksi/Polidimetilsiloksan/SiO2 yüzeyler üstün ıslanabilirlik ve mekanik dayanım özellikleri sergilemektedir. Püskürtme süresi, yüzeylerin mekanik aşınma davranışında önemli bir etkiye sahiptir. Püskürtme süresi kısa kaplamalar yüksek abrazif aşınma dayanımı özelliği sergilerken uzun püskürtme süresi ile üretilen kaplamalar ise dinamik darbeler altında uzun süre su iticilik özelliklerini korumaktadırlar.

Anahtar Kelimeler

• Epoksi
• mekanik dayanım
• silika
• sprey kaplama
• süperhidrofobik

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