Color glaze glass is to coat (or process) inorganic glaze on the glass surface through glazing processes such as screen printing, roller printing and digital glaze printing, and then dry and heat it in a heating furnace until the glass glaze is melted, and then tempered and quenched. Cold. Through heating and sintering, the glaze layer and the glass are combined into one, and it is a glass decoration product with good acid and alkali resistance and high safety. As a kind of architectural glass material, stained-glazed glass not only has decorative function, but also makes the building present rich tones and patterns, and gives dynamic beauty with the change of light. As shown in Figure 1-1, the current common colored glaze glass.

glaze properties

The glaze materials are divided into oxide glazes and metal glazes, among which the architectural color glazes are mostly inorganic material glazes. The methods of glazing with architectural glazes are mostly screen printing and roller printing. The glaze is composed of frit, pigment and oil.

Pigment

Pigment is made of metal oxides or compounds in a certain proportion through grinding, mixing, sintering, cleaning, filtering, drying, and then grinding into powder, as shown in Figure 2-1. The colorant plays a coloring role in the glaze. When the glass is tempered (glaze sintering), the colorant, frit and glass are bonded together to form a colored layer. In addition to showing the color of the glaze, the colorant also has certain shading properties.

There are many types of pigments such as selenium red, cadmium red, iron red, chrome green, cadmium selenium yellow, cobalt blue, titanium white and so on. Its color is mainly reflected by chromogenic ions in metal oxides, and these substances have certain high temperature resistance and chemical stability, and also belong to the category of inorganic chemical dyes.

The sintering temperature and sintering time of the metal oxides selected for the pigments of various colors are different, and they need to be controlled according to the technological process. After sintering cooling, cleaning is required to remove soluble salts and other impurities generated during sintering. The bulk density of the pigment in use is related to the particle size of the particles. The smaller the particle size, the larger the specific surface area, the larger the surface energy, and the greater the degree of dispersion. The particle size of the pigment is generally required to be controlled and ground to less than 5 μm. Pigment with small particle size can easily obtain a uniform glaze layer.

frit

The frit right foot base glaze is essentially a glass-like substance, which is a powder material made of fusible glass. After sintering, it can bond the pigment and the glass body. As shown in Figure 2-2.

The frit is to highly disperse the inorganic pigment, melt the surface of the glass at a lower temperature, and fuse with the glass body. Combined into a whole to form stained glass.

The color composition of the colorant is different, and the color of the frit when it is melted is also different. Therefore, the composition of the frit should be selected according to the composition of the colorant and the required color. The composition of the frit is equivalent to the main components of the glass, including: SiO2, B2O3, NaO, ZnO, K2O, CaO, Fe2O3, CdO, Al2O3, P2O5, etc. PbO is also added to some low-temperature glass frits. Its chemical raw materials are: quartz, soda ash, feldspar, red dan, boric acid, titanium dioxide, cadmium oxide, etc.

-转自中国玻璃网