Analysis of Causes of Film Fade

There are two reasons for the discoloration of the film. One is that the dye molecules get out of the network and get into the solution. The second is to react with the acidic solution to produce a colorless material. Dye absorbs visible light and develops color because each benzene ring is linked by a conjugated double bond. When the conjugated double bond between benzene rings is interrupted, it loses color. This is the reason why dyes change color at different values. The reason for the fading of blue glass belongs to the first case because methylene blue does not react with hydrochloric acid. The reasons for the fading of the green-yellow glass are both.

The performance of the film is relatively poor. After soaking for weeks, it becomes almost as good as a colorless film, and the best of the blue film is added, and the color is almost unchanged. The reason that stained glass is discolored in an ethanol solution is due to the fact that the dye molecules are not bound to the network and enter the ethanol solution. The experiment once again proved that the binding of auramine with the smallest molecular weight to the network is the weakest. The alkali resistance of the film is better than the acid resistance because the dye itself is alkaline and it is not easy to react with the solution.

The discoloration of the color film under alkaline conditions is similar to that in an acidic environment. First, the dye molecules are detached from the network and bound to the solution. Second, the double bonds used for coloration are oxidized into single bonds, and become non-existent. Color material of Michler's ketone. The performance of the colored film obtained by using different structural dyeing agents is also different. Among them, the actual durability of the blue film is excellent in scratch resistance, corrosion resistance and ultraviolet resistance, and has met the specification requirements of indoor glass products.