Research On Preparation And Properties Of Antireflection Hydrophobic Coatings

With the development of science and technology,antireflection materials with high absorptivity can effectively absorb incident light,reduce unnecessary reflection,and convert light energy into thermal energy.It has been widely used in solar absorbers,imaging system stray light elimination,infrared stealth camouflage and other fields.However,in the traditional preparation process of antireflection coating,most of the methods such as chemical vapor deposition,ultrafast laser etching and spraying have some problems;complex preparation process,high manufacturing cost,easy to fall off and damage the surface and so on.Therefore,how to prepare a kind of antireflection material with stable structure,simple preparation process and low cost is an urgent problem to be solved.For this reason,we chose cheap and easily available copper oxide(Cu O)and polyvinylidene fluoride(PVDF)as the research objects to design and develop stable and efficient antireflection micro/nanostructures that can effectively reduce the surface reflectivity of the materials.The specific research contents are as follows:(1)By adjusting the type of sandpaper,we used the method of sandpaper scratching and thermal oxidation to prepare the primary structure with micron scale on the surface of Cu.Then we used the thermal oxidation method to prepared vertically grown Cu O nanowire arrays by controlling the thermal oxidation temperature and holding time.The material increased the optical path and refraction times of incident light by the method of microstructure trapping light,combined with the absorption of incident light by Cu O itself.The reflectivity of incident light in the wavelength range of 200-700 nm was significantly reduced,and it also had self-cleaning property,which can effectively remove surface dust,and showed a high photothermal conversion rate in the application of temperature measurement and ice melting.Under the irradiation of one sunlight,the surface temperature increased from room temperature to 56.1°in 60 s and was stable at 66.5°.The ice layer of 15mm×15 mm×3 mm can melt and slip in 115 seconds.(2)Used the combination of solution gel method and non-solvent induced phase separation(NIPS)method,the casting solutions with different contents of PVDF and carbon nanotubes(CNTs)were prepared,and the content of N,N-dimethylformamide(DMF)in the coagulation bath was regulated in the NIPS method,and the micro-nanostructure with the coexistence of pores and sponges was prepared.The reflectivity of incident light in the range of 400-2000 nm is significantly reduced,and the self-cleaning property can effectively remove surface dust.It also shows a high photothermal conversion rate in the application of temperature measurement and ice melting.The surface temperature can rise from room temperature to 86.9°under a solar light intensity within 60 s and stabilize at 90.8°.The 15mm×15 mm×3 mm ice can be melted and slipped within 123 s.The Cu O nanowire arrays and PVDF/CNTs micro/nanostructures proposed in this paper have good mechanical stability,simple preparation process and suitable for large area applicated,which can effectively solve the problems of complex preparation process,high cost and easy surface shedding of traditional antireflection materials.The combination of micro/nanostructures with different scales can realized incident light absorption in wide wave band.It provide a new idea for large-scale application and rapid production of antireflective materials.