Characteristics of discolored glass

Definition of discolored glass

Discolored glass refers to the glass that changes color under certain conditions such as light, temperature, electric field or current, and surface pressure, and changes accordingly as the conditions change, and can reversibly automatically return to the initial state after the applied conditions disappear, also known as dimming glass. The discolored glass changes its transmission characteristics with the change of the external environment, which can realize the effective control of the solar radiation energy, so as to achieve the purpose of energy saving. According to the changing mechanism of glass characteristics, color-changing glass can be divided into photochromic glass, thermochromic glass, electrochromic glass and force chromic glass. Among them, photochromic and electrochromic glass are particularly concerned by the curtain wall industry.

The principle of color-changing glass

Glass that changes its color under irradiation of the appropriate wavelength of light, and restores its original color when the light source is removed. Also known as photochromic glass or photochromic glass. Color-changing glass is made by adding light-colored materials to glass raw materials. This material has two different molecular or electronic structure states, two different absorption coefficients in the visible light region, under the action of light, can be transformed from one structure to another structure, resulting in reversible color changes, common silver halide color-changing glass, is in sodium aluminum borate glass to add a small amount of silver halide (AgX) as a photosensitive agent, Then add trace copper and cadmium ions as sensitizer, melt into glass, after heat treatment at appropriate temperature, silver halide polymerization into fine particles to prepare. When it is irradiated by ultraviolet or visible short-wave, silver ions are reduced to silver atoms, and a number of silver atoms aggregate into colloids to make the glass color; After the light stops, under thermal radiation or long-wave light (red or infrared), silver atoms become silver ions and fade. Silver halide color-changing glass is characterized by not easy to fatigue, after more than 300,000 times of light and dark changes, it still does not fail, and is a commonly used material for making color-changing glasses. Color-changing glass can also be used for information storage and display, image conversion, light intensity control and adjustment. A glass containing silver bromide (or silver chloride) and trace amounts of copper oxide is a discolored glass. When exposed to sunlight or ultraviolet light, the silver bromide in it breaks down, producing silver atoms (AgBr==Ag+Br). The silver atom attracts visible light, and when the silver atoms gather to a certain amount, the bright part of the light emitted on the glass is absorbed, and the originally colorless and transparent glass will turn gray and black. When the discolored glass is placed in the dark, under the catalytic action of copper oxide, silver atoms and bromine atoms will be combined into silver bromide (Ag+Br==AgBr), because silver ions do not absorb visible light, so the glass will become colorless and transparent. This is the basic principle of color-changing glass.

Use of discolored glass

Using color-changing glass to make window glass can make the light through the hot sun become soft and cool. Color-changing glass can also be used to make solar lenses. In general, photochromic glass is produced by introducing photosensitizers into ordinary glass components. Commonly used ordinary glass are aluminum borosilicate glass, borosilicate glass, borate glass, phosphate glass, etc. Commonly used photosensitizers include silver halide, copper halide and so on. Usually, the photosensitizer is uniformly dispersed in the glass in a microcrystalline state, which decomposes under sunlight and reduces the light transmittance of the glass. When the glass is in the dark, the photosensitizer recombines to restore transparency. The coloring and fading of glass are reversible and permanent. The decorative characteristic of photochromic glass is that the color and transmittance of the glass automatically change with the sunshine intensity. The sunlight intensity is high, the color of the glass is deep, and the light transmittance is low. On the contrary, the sunshine intensity is low, the color of the glass is light, and the light transmittance is high. The photochromic glass decoration of the building not only makes the interior light soft and colorful, but also makes the building colorful and unpredictable, which is in harmony with the sunshine environment of the building. Generally used for building doors and Windows, curtain walls, etc.

Link-B2B is a professional supplier listing service platform which will provide high quality and trustworthy supplier list to international buyers. If you are looking for discolored glass suppliers, feel free to visit Link-B2B.com and send a request.