Study On The Preparation And Characteristics Of Silica Optical Film

The rapid development of the display industry has aroused people's attention to the glare problems.Therefore,anti-glare display is becoming a subject of study for many scholars.In this paper,SiO2 sol was formed by the sol-gel process of TEOS.Then AG film was prepared by aerosol spraying.Finally,we studied the characteristics of the AG film,especially the sparkle.The experimental results showed that AG film has low haze and high gloss,the surface of film looks very exquisite.But the adhension between the film and substrate is a bit poor,because the film can not withstand the friction of steel wool.For the base catalysis,we also proposed the method of Y-tube auxiliary coating.Compared with the conventional sol-gel method,this method can save more time and avoid the problem of wasting due to aging.When hydrochloric acid was used as catalyst,the adhesion of AG film was obviously improved.After the friction of steel wool,the rate of change of AG index(haze and gloss)is between 20%to 30%,and the anti-glare effect of thin film is more obvious than that of base catalysis.In case of coating efficiency,the haze of film can be up to 20%,and the gloss can be down to 40.We also studied the influence of TEOS and HCl on the optical parameters of AG film and found that anti-glare effect of AG film was proportional to the contents of TEOS and HCI.However,when the content of TEOS is equal to 8mL or less,the adhension of the film will be obviously decreased.In view of the adhension between the AG film and the glass substrate,we also studied the influence of two couping agents(MTES,KH560)on the adhension and AG index.By these couping agents,the adhension of the film has been significantly improved.Under the rubbing of steel wool,the rate of change of haze and gloss is reduced from about 22%to about 5%.We also found that MTES can increase the film's haze,and KH560 is opposite.Finally,we studied the sparkle problem of AG glass and tried to use the laser speckle to characterize the sparkle.For speckle diagram,we proposed the concept of sparklingness(Sp)to characterize the strength of sparkle.In the experiment,we use 532nm or 650nm green laser pointer as the testing light source.Let the light pass through the film and form a sparkle spots image at the receiving CCD or a piece of white paper.A standard image processing method was used to obtain an index number standing for the scattering status of the laser,which is defined as "sparklingness".In the experiment,we also analyzed the power dependence of sparklingness.With proper calibration,the measurement error of the sparklingness can be minimized,and it can be used as a physical quantity to describe the film quality as of the sparkle issue.This work can be a useful reference for further study of the sparkle issue in optical films.A standard image processing method was used to obtain an index number standing for the scattering status of the laser,which is defined as "sparklingness".In the experiment,we also analyzed the power dependence and wavelength dependence of sparklingness.With proper calibration,the measurement error of the sparklingness can be minimized,and it can be used as a physical quantity to describe the film quality as of the sparkle issue.This work can be a useful reference for further study of the sparkle issue in optical films.