Fluorescent whitening agent is a color conditioning agent that has the effect of brightening and brightening. It is widely used in papermaking, textiles, detergents and other fields. There are about 15 basic structural types of fluorescent whitening agents and nearly 400 structures. China allows two types of fluorescent whitening agents to be added to laundry detergents: distyryl biphenyls (such as CBS, etc.) and bistriazine amino distyryl (such as 33#, etc.).
The working principle of fluorescent whitening agent is to absorb invisible ultraviolet light in the light and emit visible blue light. After superimposing with the yellow light emitted by the fabric, it complements to form white light, which increases the white light emitted by the fabric. The naked eye can feel that the white fabric becomes obviously brighter and whiter. This is the brightening effect. Fluorescent brighteners can absorb invisible ultraviolet light (wavelength range of about 60-380 nm) and convert it into blue light or purple visible light with longer wavelengths, thereby compensating for the unwanted yellowish color in the matrix and reflecting more visible light in the range of 400-600 nm than the original incident wavelength, making the product appear whiter, brighter and more colorful.