What is the classification of fluorescent whitening agents

The fluorescent whitening agent can also be classified according to its purpose. For example, those used for polyester white are called polyester whitening agents. Those used for detergents are called washing agents. In this way, it is often called a fluorescent whitening agent DT as a polyester whitening agent, the fluorescent whitening agent DCB is called polyester white agent, and the fluorescent white agent VBL is called cotton premium agent. However, this classification method also has defects, or it is not strict enough, because some white agents can have multiple uses and can be used in different industries. For example, in addition to a large amount of white fiber, VBL VBL is also used in a large amount of detergent. In the blankness of plastic. Sometimes it is classified as a disintegration of fluorescence whitening agent, and they are divided into cations, ion type and non -ion type, or are divided into direct dyeing and decentralized types according to their usage. Oral dye fluorescent whitening agent refers to a type of water -soluble fluorescent whitening agent. It has affinity to the substrate and can be adsorbed by fabric fibers in water, so it has a direct white effect. This type of whitening agent has excellent uniformity and convenient use of fibers, and is mainly used for natural fibers. Differential fluorescent whitening agents refer to a type of fluorescent whitening agent that insoluble water. Before use, it must be grinded and other processes. The fiber is whitening to the fiber or high temperature infection. This type of fluorescent whitening agent must be mainly added to the synthetic fiber.

The fluorescent whitening agent can be divided into three types: cedic type, anion type and non -ion type according to their performance. Cattera -type fluorescent whitening agents are generally pale yellow solid powder, which are easily soluble in water. In the water, it is slightly yellow with fluorescent solution and can be absorbed by fibers. They have excellent direct and uniformity for fibers and are more convenient to use. Ion -type whitening agent cannot be used with dyes or additives with the opposite ion nature, otherwise it will reduce the white -added effect and even completely lose the reactions. In addition, the pH of the medium also has a great impact on the white -added effect of ion -type white agent. Non -ionic whitening agents are a type of compounds that are insoluble or slightly soluble in water. Its commercial dosage types include decentralized suspension, organic solution and ultra -fine powder. It can not only be used for the whiteness of the fabric, but also directly add the resin liquid of synthetic fiber, becoming a "permanent whitening agent".

The application of fluorescent whitening agents is extremely wide and demand has increased. It has penetrated into various industrial departments, which is closely related to people's lives. Their main purpose is:

(1) Used for the white and gorgeousness of various textile products

(2) Used for synthetic detergent to increase the washing effect of detergent

(3) For the whiteness of paper, increase the whiteness and product value of the paper

(4) For plastic white, it increases its aesthetics.