Preparation And Surface Wear Resistance Strengthening Method Of Nano Biomimetic Anti Reflection Materials

The surface of the nano-moth eye structure can achieve broadband and wide-angle antireflection effect,and because of its special surface for the nano-structure array,so that this kind of structure coating can realize excellent antireflection performance and also have the function of anti-fouling and waterproof,and has a broad application prospect.However,the wear resistance of the prepared antireflective coatings is poor due to the nature of polymer polymer chain structure.In this paper,a nano-moth-eye structured coating with excellent antireflective properties was imprinted on the PET surface by UV nanoimprinting technology,and the nano-antireflective coating was strengthened by abrasion resistance in two directions:matrix strengthening and surface engineering.Based on the substrate strengthening method,the composition and ratio of UV adhesive for UV embossing were designed,and different formulations of UV adhesive were prepared for UV nanoimprinting experiments,and the effects of polyfunctional monomers TMPTA,DPHA and Si O₂ filler on the wear resistance and other properties of nano-reflective coatings were investigated.When the content of TMPTA was 30%,the coating showed the best wear resistance and excellent anti-reflective properties.Increasing the content of DPHA also contributes more to the wear resistance of the coatings,because the multifunctional monomers can increase the crosslink density of the cured coatings.The addition of nano-Si O₂ with three-dimensional mesh structure to the light-curing system can form a mesh structure in the cured film and enhance the strength of the cured coating.Compared with the cured coating embossed with commercially available GP756,the TMPTA optimal formulation and the Si O₂ optimal formulation have 4.9 times and 4.48 times higher wear resistance,respectively.Based on the surface engineering in the wear resistance enhancement method,Al₂O₃ films were deposited on the surface of the prepared nanostructured reflective coatings using plasma-assisted atomic layer deposition（PA-ALD）.PA-ALD,due to its atomic-level control of film thickness and the advantages of high conformality and uniformity,allows it to wear-reinforce the coating surface with less impact on the reflectivity of the nano-reflective coating.The deposition of 20.43 nm Al₂O₃ films by PA-ALD resulted in a 0.34%increase in average reflectance in the 400-780 nm wavelength range compared to the non-deposited coating,but a nearly 7-fold increase in wear resistance.Moreover,the contact angle of the deposited coating surface is about144°,which gives the coating excellent self-cleaning performance.