Origin

China

Product name: Fluorescent Brightener 31

Formula:C36H33ClN12O8S2Na2
Mocular Weight: 900.84 (As international relative Atom Mass 1997)

Max UV Absorption wavelength: 348nm

Character: Show nionic character and optical blue color

Excutive standard :HG/T3727-2003

Specification: appearance: Light yellow uniform powder

                       Fluorescent strenghth (equivalent to the standard sample): 100±3

                      Whiteness (the deviation with the standard sample): -0.3% max 

                     Moisture content: 5% max 

                     color shade: similar to the standard sample

                     moisture content: 5.0% max

                     content of water-insoluble impurities: 0.5% max

                     fineness (residual content passed through 180μm-pore sieve): 6.0% max

PROPERTY:

     The difference between Optical brightener 31# and VBL is that one aniline substituent is changed into m-chloroaniline and shows anion character, the pH resist value is 7-12. It can resist 300ppm hard water, resist 0.25% free chlorine, but don't resist to copper and iron ions. It has good sun light resistance and aging resistance. When used in synthetic detergent, it has better whitening effect than VBL on the detergent itself and the cloth it washed, it can be used in one bath with anionic and nonionic surfactants and oxydol, unsuitable for used with cationic surfactants.

 APPLICATION:

    1. Fluorescent whitening agent for detergent industry and soap industry.
    2. Fluorescent whitening agent for cotton fabric and gluing products and light color or printing products. The affinity with cellulose fiber is not so good as VBL.
    3. Fluorescent whitening agent for polyvinyl alcoholic fiber and polyamide fiber
TRANSPORTATION: Should be handle carefully, avoid sunlight and moisture.
STORAGE: Should be stored in cool, dry and ventilate place, and storage term shouldn't exceed 2 years