Definition of foptical brightener


Definition of fluorescent whitening agents

Fluorescent brighteners, sometimes referred to as optical brighteners, are colorless to light colored organic compounds. Absorb the mainly invisible ultraviolet light within the range of 300-400 nano meters (nm) and convert it into visible ultraviolet to blue fluorescent light to produce a brighter and fresher appearance. Their design is to achieve brighter colors or cover yellowing in plastics, paint, pigments, ink, photo processing solutions, and fibers.




Classification of fluorescent brighteners


1) Classification by application

Here, we can use the classification of optical brighteners as a general guide, and we can know that if we choose the correct type of optical brightener for our application


Optical brighteners for detergents

Including optical whitening agents CBS-X, DMS/AMS

Optical whitening agents for paper

Including optical brightener PC, BBU/BBU, VBL/VBL l


Optical brighteners for optical fibers and textiles

Including optical whitening agents 4BK, ER-I, ER-II, PF/DT, BA, CXT, SWN

Plastic optical brightener

Including optical brighteners OB, OBR, OB-1, KSN, KCB, KSB, FP-127, CBS-127, PF


2) Classified by chemical structure.

1. Styrene type, blue fluorescent, used in industries such as cotton fiber, synthetic fiber, paper making, soap, etc.

2. Coumarin type, with a coumarinone structure and strong blue fluorescence, used in celluloid and PVC plastics.

3. Pyrazoline, green fluorescent, used in wool, polyamide, and acrylic fibers.

4. Benzo nitrogen type with red fluorescent light, used for acrylic, PVC, PS.

5. Phthalenephthalimide, blue fluorescent, used for polyester, acrylic fiber, cotton fiber.


3) Classification of fluorescent brighteners for plastics

1. Benzoxazole has the following chemical structure, and OB, OB-1, KSN, and KCB all belong to this chemical structure

2. Benzcoumarin, with the following chemical structure

3. Diphenylene biphenyls, with the following chemical structure, CBS is related to this chemical structure