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

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

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

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,

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Hwang H.S., Kim N.H., Lee S.G., Lee D.Y., Cho K., Park I., Facile Fabrication of Transparent Superhydrophobic Surfaces by Spray Deposition, ACS Applied Materials & Interfaces, 2011, 3 (7), 2179–2183, https://doi.org/10.1021/am2004575.
Kulinich S.A., Farhadi S., Nose K., Du X.W., Superhydrophobic Surfaces: Are They Really Ice-Repellent?, Langmuir, 2011, 27 (1), 25–29, https://doi.org/10.1021/la104277q.
Lazauskas A., Guobienė A., Prosyčevas I., Baltrušaitis V., Grigaliūnas V., Narmontas P., et al., Water Droplet Behavior on Superhydrophobic SiO2 Nanocomposite Films during Icing/Deicing Cycles, Materials Characterization, 2013, 82, 9–16, https://doi.org/10.1016/j.matchar.2013.04.017.
Milionis A., Loth E., Bayer I.S., Recent Advances in the Mechanical Durability of Superhydrophobic Materials, Advances in Colloid and Interface Science, 2016, 229, 57–79, https://doi.org/10.1016/j.cis.2015.12.007.
ImageJ Image Processing and Analysis in Java, https://imagej.nih.gov/ij/
Li K., Zeng X., Li H., Lai X., Ye C., Xie H., Study on the Wetting Behavior and Theoretical Models of Polydimethylsiloxane/Silica Coating, Applied Surface Science, 2013, 279, 458–463, https://doi.org/10.1016/j.apsusc.2013.04.137.
Zhu B., Liu J., Chen Y., Liu Y., Yang Z., Zhang Z., Superhydrophobic Coating with Multiscale Structure Based on Crosslinked Silanized Polyacrylate and Nanoparticles, Surface and Coatings Technology, 2017, 331 40–47, https://doi.org/10.1016/j.surfcoat.2017.10.040.
Zhang C., Kalulu M., Sun S., Jiang P., Zhou X., Wei Y., et al., Environmentally Safe, Durable and Transparent Superhydrophobic Coating Prepared by One-Step Spraying, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, 570, 147–155, https://doi.org/10.1016/j.colsurfa.2019.03.015.
Guo D., Chen J., Hou K., Xu S., Cheng J., Wen X., et al., A Facile Preparation of Superhydrophobic Halloysite-Based Meshes for Efficient Oil–Water Separation, Applied Clay Science, 2018, 156, 195–201, https://doi.org/10.1016/j.clay.2018.01.034.
Liao R., Zuo Z., Guo C., Zhuang A., Yuan Y., Zhao X., et al., Ice Accretion on Superhydrophobic Insulators under Freezing Condition, Cold Regions Science and Technology, 2015, 112, 87–94, https://doi.org/10.1016/j.coldregions.2015.01.006.
Wu B., Lyu J., Peng C., Jiang D., Yang J., Yang J., et al., Inverse Infusion Processed Hierarchical Structure towards Superhydrophobic Coatings with Ultrahigh Mechanical Robustness, Chemical Engineering Journal, 2020, 387, 124066, https://doi.org/10.1016/j.cej.2020.124066.
Xue C.H., Zhang Z.D., Zhang J., Jia S.T., Lasting and Self-Healing Superhydrophobic Surfaces by Coating of Polystyrene/SiO2 Nanoparticles and Polydimethylsiloxane, Journal of Materials Chemistry A, 2014, 2 (36), 15001–15007, https://doi.org/10.1039/C4TA02396J.
Ren T., Tang G., Yuan B., Yan Z., Ma L., Huang X., One-Step Fabrication of Robust Superhydrophobic Coatings with Corrosion Resistance by a Self-Curing Epoxy-Resin-Based Adhesive, Surface and Coatings Technology, 2019, 380, 125086, https://doi.org/10.1016/j.surfcoat.2019.125086.
Li X., Zhao S., Hu W., Zhang X., Pei L., Wang Z., Robust Superhydrophobic Surface with Excellent Adhesive Properties Based on Benzoxazine/Epoxy/Mesoporous SiO2, Applied Surface Science, 2019, 481, 374–378, https://doi.org/10.1016/j.apsusc.2019.03.114.
Li D.-W., Wang H.-Y., Liu Y., Wei D.-S., Zhao Z.-X., Large-Scale Fabrication of Durable and Robust Super-Hydrophobic Spray Coatings with Excellent Repairable and Anti-Corrosion Performance, Chemical Engineering Journal, 2019, 367, 169–179, https://doi.org/10.1016/j.cej.2019.02.093.
Wu Y., Jia S., Wang S., Qing Y., Yan N., Wang Q., et al., A Facile and Novel Emulsion for Efficient and Convenient Fabrication of Durable Superhydrophobic Materials, Chemical Engineering Journal, 2017, 328, 186–196, https://doi.org/10.1016/j.cej.2017.07.023.
Elzaabalawy A., Meguid S.A., Development of Novel Superhydrophobic Coatings Using Siloxane-Modified Epoxy Nanocomposites, Chemical Engineering Journal, 2020, 398, 125403, https://doi.org/10.1016/j.cej.2020.125403.
Lou C., Zhang R., Lu X., Zhou C., Xin Z., Facile Fabrication of Epoxy/Polybenzoxazine Based Superhydrophobic Coating with Enhanced Corrosion Resistance and High Thermal Stability, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, 562, 8–15, https://doi.org/10.1016/j.colsurfa.2018.10.066.