Research On Treatment And Modification Of Glass Surface

The treatment and modification of glass surface has great significance in the process of glass production.We can improve the surface properties of glass and make it a new function by changing the chemical composition of glass surface or coating on the glass surface.In this subject,the modification of glass surface was studied from the two aspects of glass surface coloring and preparation of anti-fog coating.The brown glass with smooth surface had been prepared by coloring its surface with ion diffusion of silver and copper,and the substrate was high borosilicate glass.The influence of different factors on the coloring effect was researched and the optimum process conditions was determined under which brown coloration should be obtained by testing and analyzing transmittance,dominant wavelength and color purity of samples.Experimental results show that a better coloring effect can be achieved when the mass of AgNO3 and CuSO4 accounted for 70%of the color paste,the mass ratio of AgNO3 and CuSO4 was 1:5,and the heat treatment was 620℃ or 90min under a reducing atmosphere.Micelles with a diameter of several micrometers to dozens of microns on the surface of samples can be found by scanning electron microscopy(SEM).Energy dispersive X-ray spectra(EDS)analysis further indicated that the main components were Ag and Cu.The colored portion of the glass had excellent hot corrosion resistance.The hydrophilic anti-fog coating based on poly(vinyl alcohol)(PVA)was prepared by the method of graft copolymerization on the float glass substrate.Firstly,amino group was grafted on the surface of hydroxylated substrate,then crosslinking and anti-fog layers were plated in turn by spin coating method.The crosslinked layer was provided by poly(ethylene-alt-maleic anhydride)(PEMA)or styrene-maleic anhydride copolymer(SMA),and the anti-fog layer was PVA.Infrared reflection spectroscopy and contact angle test proved that the reaction of each step was successful in the process of coating preparation.Experiments show that when the concentration of PVA was 1～2%,the speed was 3000r/min,coating time was 20-40s,and vacuum curing at 95℃ or 120℃ for 6～9h,the anti-fog performance and mechanical properties of the coating were the best.The contact angle was within 20°,anti-fog level was 8 or 10,hardness can reach above 5H,adhesive force was not more than 1 level.In order to reduce the production cost,SMA was synthesized to replace the expensive PEMA and prepare anti-fog coating.Their performance of all respects almost remained consistent by comparing the coatings prepared with SMA and PEMA.The surface morphology of coating was observed by scanning electron microscopy(SEM),and the coating thickness was about 10 microns.Light transmittance tests show that the anti-fog coating had little effects on the transmittance of glass,which can stay above 85%.The anti-fog coating had good water resistance.