Product Name: Direct Red 31
C.I. No.: 29100
CAS No.: 5001-72-9
Molecular Formula: C32H21N5Na2O8S2
Molecular Weight: 713.65
Direct Red 12B,Direct Fast Pink,Direct Pink 12B,Direct Pink 5B.
Shade: colourful red blue light. Red brown powder
Direct Red 31 Physical Properties and light fastness, solubility.
|Direct Red 31|
|Dyeing depth %||2|
Direct Red 31 Properties and Applications:
Soluble in water for product red solution, the solubility of 45 g/L (80 ºC), also can dissolve in fiber element solution, slightly soluble in alcohol for red orange, insoluble in other organic solvents. The strong sulfuric acid in orange to red light for brown, diluted dark blue light red precipitate generated; In nitric acid solution for orange brown, precipitation. The dye solution to generate strong hydrochloric acid purplish red precipitate; Add thick sodium hydroxide solution for orange brown. Copper ions in dyeing dim light; Iron ion in micro have change. Mainly used in viscose, such as cotton, silk, polyamide fiber cellulose fiber and viscose/silk blended fabric dyeing, can be used for pulp shading.
Package, 25KG/DRUM, CARTON BOX, BAG