Study On The Preparation And Surface Properties Of Multifunctional Superhydrophobic Antifouling Coatings

The super-hydrophobic coating has been widely used in industrial and biological fields due to its excellent hydrophobicity,anti-icing performance and environmental friendliness.At the same time,photocatalytic technology is being promoted due to its advantages such as high efficiency,safety,and environmental protection.Because the strong oxidizing substances generated by the photocatalyst under the excitation of ultraviolet light will decompose the low surface energy materials that constitute the superhydrophobic coating,resulting in poor durability of the superhydrophobic coating,therefore,there are relatively few studies combining superhydrophobic coatings with photocatalytic technology.In this paper,polydimethylsiloxane?PDMS?with excellent durability and chemical inertness is used as a low surface energy material.Nano titanium dioxide?TiO₂?and zinc oxide?ZnO?modified with a silane coupling agent?KH-550?are used.For the construction of rough surface structures,two types of organic nano-photocatalyst hybrid multi-functional super-hydrophobic antifouling coatings were prepared by organic combination of the two.The influence of preparation conditions on the hydrophobicity of the coating and its anti-particle contamination were studied.Applications in chemicals,liquid contaminants and antibacterials,and their self-cleaning performance and durability have been studied.The specific research content of this article mainly includes the following two parts:?1?A UV-stabilized ZnO hybrid multifunctional super-hydrophobic antifouling coating was prepared using PDMS and nano-ZnO,and applied to substrates such as glass,paperboard,and aluminum foil through a simple spraying process.Some characterization methods were used to determine the apparent morphological structure,groups and light absorption capacity of the prepared samples.It was determined that the modification of KH-550 can enhance the hydrophobic property of the coating,and then the single-factor experiment was used to determine that the doping ratio of PDMS and ZnO was 4:3,and the spraying amount was 0.83g/dm².The coating could achieve the best hydrophobic performance,and it can be cured within 1 hour at 35?.Subsequently,dust,dye,and mold were selected as target pollutants,and the antifouling performance of the prepared multifunctional super-hydrophobic antifouling coating was investigated.Finally,the self-cleaning ability of the prepared coating was investigated by droplet scouring and dye degradation experiments,and the durability of the coating was tested by ultraviolet light exposure and outdoor exposure experiments.The experimental results show that the ZnO hybrid multifunctional super-hydrophobic antifouling coating has excellent antifouling ability against dust,dyes,and mold,and has good self-cleaning performance and stability.?2?TiO₂ was loaded on ZnO to prepare TiO₂/ZnO composite nanomaterial,and then KH-550 was used to modify the TiO₂/ZnO composite nanomaterial.The modified nanomaterial was dispersed in PDMS,and the TiO₂/ZnO hybrid was prepared by spraying process Multifunctional super-hydrophobic antifouling coating.The structure,group and light absorption capacity of the prepared samples were determined by some characterization methods.Then by scanning electron microscopy combined with single-factor experiments,the optimal loading of TiO₂ nanoparticles was determined to be 30%.Subsequently,it was determined through single-factor experiments that the modification of KH-550 can significantly improve the hydrophobicity of the coating.The doping ratio of PDMS and TiO₂/ZnO is 4:3,and the spraying amount is 0.78g/dm².The coating can achieve the best hydrophobicity.And the best curing effect can be achieved within 1 hour at 35?.Then,dust,dye,and mold were selected as the target pollutants,and the antifouling,self-cleaning,and durability performance of TiO₂/ZnO/PDMS coatings were investigated.The experimental results show that the TiO₂/ZnO/PDMS coating has better super-hydrophobic properties,and has better performance in degrading organics and anti-molds,and has better self-cleaning performance and stability.