The Institute of Oceanography of the Chinese Academy of Sciences announced today that the research group of marine corrosion and pollution prevention and control materials of the National Key Laboratory of Marine Key Materials of the Institute, inspired by the wear-resistant buffer multi-layer structure of rubber runways, has designed and constructed a super hydrophobic composite coating with high mechanical stability and long-term anti-corrosion performance using waste tire rubber particles as the armored skeleton structure. The relevant research results have been published in the international academic journal Chemical Engineering Journal (Impact Factor 13.2).
The discovery, biomimetic preparation, and enormous potential applications of superhydrophobic materials (static contact angle>150 °, rolling angle<10 °) inspired by the "lotus leaf effect" in nature have attracted high attention from researchers in fields such as self-cleaning, oil-water separation, radiative cooling, energy harvesting, fluid drag reduction, anti-corrosion, anti icing, and wearable sensing. Especially in the field of anti-corrosion, the extremely low solid-liquid contact area and low surface energy characteristics of superhydrophobic materials provide innovative perspectives for the design and development of anti-corrosion coating materials.
However, currently superhydrophobic anti-corrosion materials generally suffer from problems such as poor mechanical stability, susceptibility to wear and tear, and poor long-term protective performance, which make it difficult to meet the performance requirements of materials in practical application scenarios and complex working conditions, hindering the progress of superhydrophobic materials from laboratory research to practical applications. How to design and develop highly stable superhydrophobic and long-lasting anti-corrosion coatings is still an important research hotspot and challenge in this field.
The research team was inspired by the wear resistance, weather resistance, and buffering characteristics of the commonly seen multi-layer structure of rubber tracks in daily life, as well as the reflection on the resource waste, environmental pollution, and recycling issues caused by the accumulation of waste rubber tires. Zhang Binbin's research team innovatively combined the rubber particles of waste old tires with the design concept of armored structure, and successfully constructed a three-layer composite superhydrophobic anti-corrosion coating, achieving a "win-win" design of high-value waste utilization and high-performance superhydrophobic anti-corrosion coating.
This composite coating consists of epoxy resin (EP) as the bottom layer, recycled tire rubber particles (RTR) as the intermediate layer of large-scale armor structure, and fluorosilane modified alumina @ thermoplastic polyurethane（ S-Al2O3@TPU ）The superhydrophobic surface layer forms a three-layer protective system. The prepared RTR armored superhydrophobic composite coating can withstand 1200 cycles of sandpaper friction, 450 cycles of tape peeling, and 1050 grams of sand impact, demonstrating significantly improved mechanical stability and interfacial adhesion.
The electrochemical test results showed that the low-frequency modulus and charge transfer resistance of Q235 carbon steel protected by the coating increased by 7 orders of magnitude, while the corrosion current density decreased by 5 orders of magnitude. In addition, after soaking in a 3.5% sodium chloride solution for 840 hours and exposure to outdoor marine atmospheric environments for 1680 hours, the coating still maintains its superhydrophobic protective properties, demonstrating its excellent long-term anti-corrosion potential.
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