Research On The Preparation And Properties Of Multifunctional Superhydrophobic Material Based On VPDMS

Superhydrophobic materials are a kind of functional material with special surface wetting properties,which possess the features of lipophilicity,hydrophobicity,self-cleaning and so on.Therefore,they show tremendous practical applications in the fields of anti-bacteria,anti-corrosion,anti-icing,self-cleaning,drag reduction,oil/water separation,and electromagnetic interference shielding.However,some disadvantages are performed in current superhydrophobic materials.First,the cost for fabricating superhydrophobic material is expensive and the method is complicated.Second,fluorine-containing compounds adopted are not only expensive,but also exert negative effects on ecosystem and human health.Third,most of the superhydrophobic materials demonstrate poor mechanical and chemical stability,which make them difficult to commercialize.Fourth,adopting thermal curing method to prepare superhydrophobic materials not only reduces the curing efficiency but also increases the energy consumption.In this paper,economical,safe,and non-toxic vinyl-terminated polydimethylsiloxane(VPDMS)was used to prepare two multifunctional superhydrophobic materials under ultraviolet(UV)curing.First,Co_0.8Mg_0.2Fe₂O₄(CMFO)nanoparticles were synthesized by hydrothermal synthesis,and CMFO nanoparticles were modified with(3-mercaptopropyl)trimethoxysilane(MPTMS)to obtain functionalized Co_0.8Mg_0.2Fe₂O₄(FCMFO)nanoparticles with sulfhydryl groups.Then,FCMFO nanoparticles were mixed with VPDMS to obtain organic/inorganic superhydrophobic coatings.Finally,multifunctional organic/inorganic superhydrophobic cotton fabrics with high cross-linked were fabricated via dip-coating and UV curing.The structure and properties of organic/inorganic superhydrophobic cotton fabrics were characterized by FT-IR,XRD,SEM,EDS,XPS and VSM.Meanwhile,the influence of the mass ratio of FCMFO nanoparticles to VPDMS on the properties of superhydrophobic cotton fabrics was studied.The results showed that the water contact angle(WCA)of the organic/inorganic superhydrophobic cotton fabrics reached 157.1°when the mass ratio was 0.3,which had good self-cleaning,mechanical stability,chemical stability,flame retardancy,stretch resistance and oil/water separation performance.The magnetic property of these superhydrophobic cotton fabrics could be used to control remotely the separation of oil from water.These superhydrophobic fabrics had high oil/water separation efficiency(98.7%for dichloromethane/water)and high oil flux(71506 L·m^-2·h^-1for dichloromethane/water).Therefore,organic/inorganic superhydrophobic cotton fabrics are expected to be a multifunctional superhydrophobic material used in many fields.In addition,“flammulina velutipes”-like multifunctional superhydrophobic carbon fabrics were prepared(S-CF-ZN)via three-step method.The“flammulina velutipes”-like micro/nano rough structure was built with ZnO nanorod array and Ni.VPDMS coating was covered on the surface through dip-coating and UV curing.The structure of carbon fabrics was characterized by XRD,SEM,EDS,XPS,which confirmed that S-CF-ZN was prepared successfully.At the same time,the effect of the number of electrochemical deposition of Ni on the superhydrophobicity and electromagnetic interference shielding performance of S-CF-ZN was studied.The results showed S-CF-ZN₅ had excellent superhydrophobicity,self-cleaning and electromagnetic interference shielding performance when the number was 5 times.The water contact angle(WCA),the sliding angle(SA)and the total shielding effectiveness(SE)of S-CF-ZN₅ was 159.8°,5°and 40d B,respectively.The?and F of the dichloromethane/water mixture were 99.1%and 80514 L·m^-2·h^-1,respectively.S-CF-ZN₅ still had good superhydrophobicity and electromagnetic interference shielding performance after friction or organic solvent soaking.Therefore,the self-cleaning“flammulina velutipes”-like multifunctional superhydrophobic carbon fabrics will have broad market potential and development prospects in the oil/water separation and electromagnetic interference shielding.