Direct Sky Blue 5b Direct Blue 15

• CAS No.: 2429-74-5
• Formula: C28h31n6na4o16s4
• Colour: Blue
• Appearance: Powder
• Usage: Paper, Textile
• Application Material: Wool
• Model NO.: DB15
• Transport Package: Paperbox, Paperboard Drum, Iron Drum
• Specification: 25kgs
• Trademark: Emperor
• Origin: China
• HS Code: 32041700
• Production Capacity: 80000mt/Year

Product Description

Product Name: Direct Blue 15
C.I. No.:24400
CAS No.: 2429-74-5   
Molecular Formula: C28H31N6Na4O16S4  
Molecular Weight: 992.81
Relative Name:
ACDI Sky 5B; Apollo Direct Sky Blue 5B; Atul Direct Sky Blue; Bitamine Direct Sky Blue FB; Blue 5BN; Concorde Direct Sky Blue 5B ; Condirec Blue AE; Direct Blue FFN; Direct Blue for paper; Direct Fast Blue 5B; Direct Pure Blue; Direct Sky Blue 5B; Direct Sky Blue FF;  Enianil Brilliant Blue AN; Kayafect BlueC ; Levacell Blue S; Rifa Leather Blue SB; Simrect Sky Blue 24943; Tertrodirect Blue FF; Vicorect Sky Blue FF; Vopsider Blue DFFN
Shade: blue powder, soluble in water solution for the red light blue.

Direct Blue 15 Dyeing Fastness(grade)
 

sun exposure	standard depth	-
	1/12 depth	-
soaping	original color change	2
	white fiber stained	1~2
flooding	original color change	3
	white fiber stained	2
perspiration	original color change	3~4
	white fiber stained	2
rubbing	wet	3
	dry	4~5
ironing		4~5
acid and alkali	sulfuric acid	4
	acetic acid	2
	soda ash	4

Direct Blue 15 Properties and Applications:
Direct Lake Blue 5B Appearance is generally blue uniform powder. Good water solubility, soluble in water, reddish blue, insoluble in organic solvents. It is blue-green in concentrated sulfuric acid, reddish blue after dilution; in concentrated nitric acid It is reddish gray. Its aqueous solution is concentrated with hydrochloric acid and has a red-blue precipitate. Concentrated sodium hydroxide has a purple precipitate. In case of copper ion, the color becomes dark.
Application:
1. Direct Lake Blue 5B has been used to dye cotton or viscose fiber to get bright green blue, such as diazotization after dyeing, coloring with phenylmethylpyridone, which gives blue-green color. The dyeing rate is very good, shifting Dyeing and leveling are poor, it is advisable to add salt to control the dyeing to obtain uniform color. After dyeing, the dyeing solution should be naturally cooled to 60~80 °C, which is good for dye exhaustion.
2. Direct Lake Blue 5B has been used to dye rich fiber, the dyeing rate is very good, but the color light is slightly darker than cotton. When dyeing vinyl fabric, the dyeing rate is poor, the color light is slightly bluer than the viscose fiber. Cotton, viscose fiber and When the other fibers are dyed in the same bath, the wool and nylon are gray, the silk is very light, the polyester and acrylic fibers are light yellowish gray, and the second vinegar fiber is not stained. When used for cold dyeing, the silk and wool are basically not stained.
3. Direct Lake Blue 5B has also been used for direct printing of cotton or viscose fabrics. When printing dark patterns, it can be used to dissolve dyes in urea. When dyeing for ground color, the dyeing performance is good. After coloring, it was whitened with a stannous chloride reducing agent, and the whitening effect was good.
4. Direct Lake Blue 5B was once one of the main blue direct dyes. It is mainly used for dyeing and printing of viscose fabrics, cotton knits and fabrics such as flannel and velvet. It is also used in viscose fiber. Dyeing with nylon blend fabric.