Rheological Behaviors of the Glass Paste for Hermetic Sealing the Edge of the Vacuum Glazing

摘要

Vacuum glazing is a new building material with excellent energy conservation and sound insulation properties. Usually, the edge sealing layer between two sheets of glass substrates is prepared by spraying the seal glass paste and then sintering. In the present research, a more effective preparation method is reported. The edge sealing layer is prepared with a glass paste by screen printing and then sintering. The glass paste for the preparation of edge sealing layer of vacuum glazing was composed of low melting glass powder, ZrW_(2)O_(8)powder with negative coefficient of thermal expansion and ethyl cellulose terpineol solution. The rheological, thixotropy and the screen printing behaviors of the typical paste were characterized and discussed. To get a thicker as-printed layer, the paste has high solid content and little thixotropy. The typical paste behaves a typical rheological behavior of pseudoplastic fluid. The test result of the shear strength of the sealing layer indicated that the sealing is reliable.