The purpose of applying fluorescent whitening agents is to whiten and brighten substrates such as fibers, paper, plastics, etc., in order to improve the appearance of these products, increase their whiteness, and thereby increase the competitiveness and added value of the products. In order to achieve the above purpose, the selection of appropriate fluorescent whitening agent varieties and the use of reasonable fluorescent whitening agent technology are the most important key factors.
The main applications of fluorescent brighteners in China are textile fibers. There are three main types of fibers, namely cellulose fibers, protein fibers and synthetic fibers. Like dyeing fibers, when using fluorescent whitening agents, you must first understand the properties of the fibers to be whitened, that is, their chemical composition and physical properties, so that the varieties and processes of fluorescent whitening agents can be properly selected Parameters to obtain satisfactory results.
With a good fluorescent whitening agent, it is necessary to have a proper whitening process in order to play the efficacy of the fluorescent whitening agent. For example, the fluorescent whitening agent for cotton fiber whitening is mainly anionic water-soluble, and most of them are bistriazine aminostilbene disulfonic acid type.
Like protein fiber, it is a high molecular weight organic nitrogen-containing polymer compound. Protein fiber is very sensitive to oxidants. In view of the unique chemical properties of protein fiber, avoid using chemical substances that will damage them when whitening the fiber. .