Study On A New Optical Antifogging Nano-materials

Fogging on the surface of materials is a natural phenomenon, but it can cause a lot of inconvenience and danger in our work and daily lives, so the study on anti-fog technology of transparent material has its practical meanings. At present, scientists focus on using hydrophilic technology to make antifogging materials. Because the traditional antifogging film can not attach to materials firmly and it is easily exfoliated, we attempt to use addition polymerization to make a new film that has more ideal performances, such as fasten binding force, high hydrophilicity and enhanced transmittance.PartⅠPreparation and characterization of antifogging film precursor with anti-reflection and high hardnessMETHODS:Anti-reflective and high hardnessly Si-O-Si network structure precursor, was made by tetraethyl orthoslicate (TEOS), vinyl triethoxy silane (A-151), ethanol, HC1 and H2O with the sol-gel method. The texts of properties were acquired using FTIR, XRD, UVSP, SEM. And measured the film of particle size, coating hardness, water contact angle and so on.RESULTS:The precursor had a Si-O-Si network structure. The maximum transmittance of optical material was over 92.0%. It was higher than uncoated one. The particle size of precursor was about 208.0±42.3 nm in diameter, the 52.3°, the coating hardness was about 6H, and the binding degree was abouwater contact angle was about t 96.2%。CONCLUTIONS:The precursor of Si-O-Si network structure could be firmly coated on the surface of transparent substrate. And this could make the substrate have the characteristics of antireflection and antifogging.PART II Preparation and characterization of hydrophilic and antifogging nano-film of anti-reflection and high hardnessMETHODS:The nano-film was prepared using addition polymerization theory, by using Si-O-Si as solvent, mixing ammonium acrylate, ammonium methacrylare and ammonium persulfate together, and using 2-hydroxyethyl methacrylate, methyl methacrylate as auxiliary functional groups. We discussed the durability of films. Measurement is the same as the methods of Part I.RESULTS:The nano-film not only had Si-O-Si network structure, but also had polymeric hydrophilic groups. The maximum transmittance of optical material was over 94.0%. It was higher than uncoated one. The particle size of nano-film was about 265.0±43.8 nm in diameter, the water contact angle was about 14.5°, coating hardness was about 6H, and the binding degree was about 95.1%。CONCLUTIONS:The nano-film had -CH= CH2 bond in the Si-O-Si network structure, therefore, it could connect with hydrophilic groups. As soon as the water droplet contacted the surface covered with the nano-film, it would spread over the surface, suggesting that a high transmittance surface would be achieved. Besides high transmittance and hardness, this film had other properties such as antireflection and antifogging. The preparation technology is feasible, and the quality controlling method is simple and reliable.