Leadless bismuth oxide sealing glass for sealing plate glass and preparation method thereof

Abstract

The invention relates to lead-free bismuth oxide sealing glass for sealing flat glass and a preparation method thereof. The sealing glass comprises the following components by weight percentage: 30 to 60 percent of Bi2O3, 15 to 50 percent of B2O3, 5 to 25 percent of BaO, 0.1 to 10 percent of ZnO, 0.1 to 5 percent of Al2O3, 0.1 to 5 percent of Na2O, and 0.1 to 5 percent of Li2O. The preparation method comprises the following steps: (1) weighing raw materials; (2) mixing the raw materials; (3) melting the raw materials in an electric furnace at a temperature of between 1,100 and 1,300 DEG C; (4) pelleting the molten glass by a pelleting machine; (5) ball-milling the glass; and (6) sieving, detecting and packaging the ball-milled glass powder. The expansion coefficient of the lead-free bismuth oxide sealing glass is between 68*10<-7> and 90*10<-7> / DEG C, and the sealing temperature is between 510 and 600 DEG C; and the lead-free bismuth oxide sealing glass is suitable for sealing of multiple kinds of flat glass, has the advantages of low melting point, environmental protection, innocuousness and no pollution, can be added with pigments to generate diversified colors, and meets personalized requirement.

Description

technical field [0001] The invention belongs to the field of lead-free sealing glass and its preparation, in particular to a lead-free bismuth oxide sealing glass used for flat glass sealing and a preparation method thereof. Background technique [0002] Flat glass is also called white sheet glass or clear sheet glass, its chemical composition generally belongs to soda lime silicate glass, and its composition range is: SiO 2 70-73% (weight, the same below); Al 2 o 3 0~3%; CaO 6~12%; MgO 0~4%; Na 2 O+K 2 O is 12 to 16%. It has the properties of light transmission, transparency, heat preservation, sound insulation, wear resistance and climate change resistance. The main physical performance indicators of flat glass: the refractive index is about 1.52; the light transmittance is more than 85% (glass with a thickness of 2 mm, except for colored and coated glass); m Kelvin); expansion coefficient 7~9×10 -6 / °C; specific gravity about 2.5; flexural strength 16-60 MPa. Due ...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide lead-free bismuth oxide sealing glass for flat glass sealing and its preparation method. The sealing glass has low melting point, non-toxic and pollution-free, and can be widely used in various flat glass Sealing, meeting the market demand for lead-free glass powder for lead-free flat glass sealing

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