Fluorescent whitening agent OB-1 is a white powder mainly composed of styrene and polyvinyl alcohol. It is mainly used for whitening cellulose fibers and dyeing dyeing fibers. It has good water resistance, washing fastness and abrasion resistance, which can significantly improve the brightness and color of the fiber fabrics and make them have good clothing performance. It has excellent anti-fading performance and good weatherability and oxidation resistance, which can significantly improve the durability and service life of the fibers. In addition, it can also improve the softness of the fibers, making them more comfortable to wear.