Fabrication Of Mineral Superhydrophobic Materials And Study Of The Enhancement For Their Wear-resistance And Durability

Superhydrophobicity is the special wetting performance which not only gives excellent water repellency to the solid surface,but also has great application prospect in the field of metal surface corrosion,anti-fouling of building surface and microbial corrosion.At present,most of the superhydrophobic surface structure is fragile due to its micro/nano structure has poor mechanical properties.The surface structure is destroyed because of the impact of external forces,external friction,other mechanical effects and damage,and even touch with fingers.Therefore,it's significant to improve the wear-resistance of superhydrophobic surface for its extensive application in various fields.The purpose of this paper is to explore the simple and low cost methods to prepare superhydrophobic materials with excellent hydrophobicity,good wear-resistance,stable mechanical properties based on the mineral,so as to provide useful data and scientific basis for the practical application of superhydrophobic materials.The main research contents of this article are as follows:(1)The recyclable superhydrophobic materials were successfully prepared by employing surface-functionalized quartz sand particles with diethoxydimethylsilane embedded into polyvinylchloride on various substrates.The as-prepared superhydrophobic materials not only exhibited high water contact angle but also can retain excellent chemical stability and fascinating mechanical durability after many rigorous tests.These materials can pass the 5H pencil hardness test and maintain good superhydrophobicity even after 500 cm abrasion by a mechanical reciprocating abrasion test loaded of 500 g.Importantly,the debris that is scraped from the superhydrophobic materials can be recycled and easily reused to prepare the superhydrophobic materials.(2)The durable superhydrophobic materials were prepared by employing organosilane with surface-functionalized quartz sand particles by means of polymer curving method on various substrates.The obtained materials possess superhydrophobicity with the water contact angle of 158 ± 1°.The SEM measurement revealed that the porous structures formed the micro-nano hierarchical morphology on the surface and obvious scratch after friction test.Moreover,the materials can endure the 6H pencil hardness test and also can keep stable superhydrophobicity under extreme environment conditions of immersion test and mechanical force.Finally,the results show that the material has good self-cleaning ability.(3)Mechanically stable and recyclable superhydrophobic materials were prepared from polyvinylchloride(PVC)and kaolin nanoparticles modified by stearic acid using a simple and low-cost drop-coating on various substrates.The obtained materials displayed liquid-repellent toward water and several other liquids of daily life(such as orange juice,coffee,milk,coca cola and ink).These superhydrophobic materials showed remarkable robustness against sandpaper abrasion,UV-irradiation and ultrasonication test,while retaining its superhydrophobicity even after 60 abrasion cycles loaded of 500 g with sandpaper,7 days UV-irradiation or 120 min ultrasonication test.The excellent durability against complex conditions was attributed to the hierarchical structure and strong interfacial adhesion of the materials.More significantly,the materials used in the coating could be recycled and reconstructed without losing its superhydrophobicity.(4)The stability superhydrophobic composite materials with recycles were successfully prepared by employing surface-functionalized brucite and hydrophobic SiO2 particles by means of polymer curving method on various substrates.The brucite particles were used as the raw material,and the polydimethylsiloxane(PDMS)were used as surfactant.The obtained superhydrophobic materials exhibited water contact angles greater than 150° and water sliding angles lesser than 8°.Moreover,the mechanical durability of the obtained superhydrophobic material was evaluated by a sandpaper abrasion.Additionally,the as-prepared superhydrophobic material has excellent corrosion resistance,high stability and excellent durability exposured to UV-irradiation as well as self-cleaning ability.What is more,the as-prepared superhydrophobic material could separate oil/water mixture with the separation efficiency larger than 90%.Importantly,the debris that was scraped from the superhydrophobic materials can be recycled and easily reused to prepare the new superhydrophobic materials.