Preparation And Properties Of Nano Iron Oxide Superhydrophobic Coating

Super hydrophobic surfaces have attracted great attention due to their unique properties and practical applications.In this paper,Nanoα-Fe₂O₃ with different particle sizes were prepared by precipitation method using ferrous sulfate（FeSO₄·7H₂O）and oxalic acid（H₂C₂O₄·2H₂O）,and further modified by different kinds of modifiers to obtain nano-sized iron oxide.In addition,the optimium process for preparing Superhydrophobic fabrics coating,the photocatalytic properties of nano-iron oxide,the wetting property of nano-iron oxide super-hydrophobic fabric,the reversible wetting property of super-hydrophobic fabric,the weather resistance and practical application of super-hydrophobic fabric were investigated.The results show that:Firstly,after the modification using a titanate coupling agent and a silane coupling agent,the dispersibility of the nano iron oxide is remarkably improved.It can be seen from the scanning electron microscope that the higher the calcination temperature,the larger the particle size of the nano-iron oxide and the more obvious the agglomeration affect.It was found by photocatalytic experiments that the nano-iron oxide obtained by calcination at 300℃had the smallest particle size and the best efficiency for degrading reactive dyes.The dosage of iron oxide has obvious effect on the degradation of dyes.The photocatalytic effect of UV lamps was the best.The efficiency of the iron oxide after modification for degrading dyes is improved obviously and the degradation rate of the silane coupling agent is up to 99%,which has good degradation rate for all three dyes.Secondly,the hydrophobic emulsion obtained from the reaction of ethyl acrylate and vinyl silicone resin has a significant improvement on the hydrophobicity of the fabric surface.The hydrophobicity of the fabrics can be superhydrophobicity after being coated with nanometer iron oxide.The particle size of nano iron oxide has obvious influence on the wetting property of super-hydrophobic fabric.The smaller-sized iron oxide has the best effect,and the surface of the fabric can be super-hydrophobic,and the coating times are 2 times.It can be seen from the morphology of the iron oxide coated on the cotton fabric modified by the silane coupling agent and the titanate coupling agent that the iron oxide adheres well to the surface of the cotton fabric.Compared to unmodified iron oxide,the distribution of the modified iron oxide cotton fabric is more uniformly,the contact angle of the modified iron oxide cotton fabric is increased,and the modification effect of silane coupling agent is the best,and the contact angle can reach 159.3°.Thirdly,after ultraviolet light irradiation,the light surface of the superhydropho-bic cotton fabric is converted from superhydrophobic to superhydrophilic,while the unilluminated surface is still superhydrophobic.Therefore,the wettability of the prepared fabric can be changed after irradiation with ultraviolet light.After 45 days in the darkroom,the fabric surface returned to superhydrophobicity.Fourthly,superhydrophobic cotton fabric still has excellent superhydrophobicity in acid-alkaline and salty environments,and also has excellent stability,good mechanical wear resistance and fire resistance.The cotton fabric irradiated by ultraviolet light has a good single moisture guiding effect.Superhydrophobic cotton fabrics efficiently separate oil-water mixtures with excellent corrosion,ice and self-cleaning properties.