As an important fine chemical product, fluorescent whitening agent has a wide range of industrial applications and good market prospects. At present, many scientists at home and abroad are working on the research of fluorescent whitening agent. The main research direction is to develop fluorescent non-fading, easy to obtain raw materials, simple synthesis, pollution-free and other practical. Fluorescent whitening agent.

 

Essential information

 

Chinese name

 

whitener

 

Name of foreign language

Brightener/Optical whitener

 

Alias

 

Optical brighteners

 

Appearance

 

White powder

 

Effect

 

Whitening Bleaching

 

Application

 

Textile, paper making textiles, pigments and paints.

 

Bleaching agents have cyclic conjugated systems in chemical structure, such as stilbene derivatives, phenylpyrazoline derivatives, benzimidazole derivatives, benzimidazole derivatives, coumarin derivatives, and naphthalimide derivatives. Among them, stilbene derivatives have the largest production, such as 4,4'-bis (4,6-diphenylamine triazinyl-2-amino) stilbene-2,2'-disulfonate sodium salt is a widely used whitening agent, the trade name of whitening agent TA. These whitening agents have been widely used in papermaking, textiles, laundry detergent and soap industry. Bleaching agent AD is a derivative of phenylpyrazoline. Its scientific name is 1 - (p-methylsulfonylphenyl) - 3 - (p-chlorophenyl) pyrazoline. It is mainly used in the production of acrylic fiber spinning, textiles and plastic products. 4-methyl-7-dimethylamine coumarin belongs to oxaphthalene-o-ketone compounds and can be used in wool fabrics, nylon fabrics, soaps and detergents.

 

The largest fluorescent brighteners in China are VBL, CXT and liquid whitening agents for paper making. General whitening agents can be divided into two categories, one is water soluble.

 

A whitening agent and a water insoluble whitening agent. The former can be used for whitening agents for paper, paint, detergent and cotton fabrics. The latter can be used for whitening chemical fibers and plastics.