Acid Dyes - Direct Dyes -  Cationic Dyes - Reactive Dyes  - Indigo

  Indigo LD (granular)
 

> Color Index Number

C.I. Vat Blue 1

 

   

> Structure formula

> Molecular Weight

262.27 (according to 2001 Edition of International Molecular Weight)

> Formular

C H10 O2 N2

> Phisical and Chemical Properties

The product is dark blue even granules, able to rapidly disperse in water, soluble in hot aniline solution.  In concentrated sulfuric acid, it appears yellowish green and after diluted, it produces the blue-colored pecipitate.  When heated to 170 degree C, it begins to sublimate and convers to purple-colored fume without decomposition.  The leuco compound presents light yellow color after the alkaline reduction.

> Uses

It is mainly used for the dyeing of cotton yarn and fabrics.  For instance, the internationally popular Blue Jeans are cross-woven mostly with the indigo-dyed yarn and while yarn.  It can also be used for the dyeing of wool and silk, therefore, a certain quantity of indigo is consumed in carpet and handicrafts making.

> Main Specifications

Items

Specifications

Content (%)

> 95

Moisture (%)

<1.0

Ionic iron (ppm)

<500

> Packing

20Kg woven plstic bags, or carton boxes sealed with plastic film, inside two plstic, containing 10 kg product each.

> Features

Compared with powdery indigo, the indigo LD has many advantages:

1. reduce pollution

 2. more brillant shade.

 3.  higher degree of dyeing  

 4.  decrease residue amount after reducing 

 5. lower ionic iron content.

 

 
 
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