Study On Enhancement Of Chemical Resistance Of Float-glass Surface By Additional Electric/Thermal Field

In 21 century, with the rapid development of post treatments of plat-glass, people bring forward that plat glass should have better surface. The weathering and deterioration of plat glasses by humidity is a common problem, which had very bad effect on the development of company.The development and popularization of float-glass are scales of the development of plat glass. In foreign countries, plat glass is almost produced by float process. Now, float glass has been produced in China more and more year by year.In this paper, it is focused on researches and experiments to increase chemical resistance of float-glass surface. Firstly, we discussed some normal methods, including interleave coating, chemical powder, chemical liquid, chemical gas, and new methods such as sterilization and doping. The additional electric/thermal field method was performed in this paper. We also studied the experimental equipments, technological parameters, and results in detail.It is focused on the research of the concentration change of elements in the float-glass surface with additional electric/thermal field assistance, in order to increase chemical resistance of float-glass surface. 4 mm rude commercial float-glass was selected as sample in this study. According to the transferring theory of charged ions, anode faced the upper surface, and cathode faced the under surface. Nkd-system Spectrophotometer (nkd-7000) analysis was used to study the optical properties of the upper surface of the float-glass. The variation of bonds in the upper surface was investigated by Infrared Reflection Spectroscopic (IRRS) analysis. While Glow Discharge-Optical Emission Spectrometry (GD-OES) analysis was employed as verifying method to study the variation of element contents on the quality of float-glass' thin layer. The mechanism of the variation of element contents in float-glass was also discussed.It is concluded that, the existence of Na~+ in float glass is the major reason of glass mould. In electric field, Na~+ is subjected to move away from the direction of positive pole. If positive poles are designed on the upper surface of float-glass, Na~+ on the surface will move inwards. The change of surface structure of twice-heated glass is much smaller than that of glasses treated by thermal/electric field. When the electric field treatment is performed, it was observed the anti-mould capability increased with the increase of the voltage. In a fixed time the capacity of anti-mould will improve with the extension of the time of electric treatment, but after the given time, such effect will no longer maintain the same trend.