Direct Blue B2r Direct Blue 71

• CAS No.: 4399-55-7
• Formula: C40h23c7na4o13s4
• Colour: Blue
• Appearance: Powder
• Usage: Textile
• Application Material: Natural Silk
• Model NO.: DB71
• Transport Package: Bag
• Specification: 25kg
• Trademark: Emperor
• Origin: China
• HS Code: 32041700
• Production Capacity: 80000mt/Year

Product Description

Product Name: Direct Blue 71
C.I. No.: 34140
CAS No.: 4399-55-7  
Molecular Formula: C40H23C7Na4O13S4
Molecular Weight: 1029.87  
Relative Name:
Ambidirect Blue R; Bitafast Blue GLL; Blue 2-RL; Blue B2R 100%;Chrochem Direct Blue BRR; Direct Blue B2RL; Direct Blue FFC;Direct Blue GLL; Direct Fast Blue B2R; Direct Fast Blue B3RL;Direct Light Blue FRL.
Shade: dark blue, blue gray powder, soluble in water for blue.

Direct blue 71 Dyeing Fastness(grade)
 

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

Direct blue 71 Properties and Applications:
Direct dark blue L-3RB alias direct light blue B2RL, direct light blue B2R. The appearance is generally blue gray uniform powder. Water soluble, soluble in water blue, slightly soluble in cellosolve, very slightly soluble in alcohol, Insoluble in other organic solvents. The dye is blue to grayish black in concentrated sulfuric acid, red-violet purple precipitate after dilution; dark brown in concentrated nitric acid; insoluble in concentrated sodium hydroxide; blue-violet in concentrated ammonia. The aqueous solution added with concentrated hydrochloric acid has a blue precipitate, and the concentrated sodium hydroxide has a red-violet purple precipitate. The copper and iron ion shades slightly change.
Application
1. Direct dark blue L-3RB dyed cotton or viscose fiber has a reddish-dark blue color. The dyeing rate is good, the transferability and levelness are poor. When dyeing, it is advisable to add salt to control the dyeing to obtain uniform color. After the dyeing stage, the dyeing solution should be naturally cooled to 80 ° C, which is beneficial to the dye exhaustion. After dyeing, the color light micro green is finished by urea-formaldehyde resin, and the color is brightly changed to green by the cyanoaldehyde resin; the red color is treated by copper sulfate, and then the resin is finished. , its sun fastness is not affected.
2. Direct dark blue L-3RB is used for dyeing rich fiber, the dyeing rate is very good, the color light is slightly darker than cotton. It can also be used for dyeing silk and its fabric, dyeing bath plus Yuanming powder and acetic acid. When dyeing vinyl fabric, dyeing The rate difference is lighter than blue. When cotton, viscose fiber and other fibers are dyed in the same bath, the wool is lighter than cotton and viscose fiber, the silk is lighter, the nylon is heavily stained, the second vinegar fiber, the three vinegar fiber, the polyester fiber. Acrylic fiber is almost non-staining.
3. Direct dark blue L-3RB can be mixed with disperse dye in high temperature dyeing and blending fabric. The dyeing bath is heated to 120 °C under neutral conditions, or loaded with boiling dye. After the dye is dyed with polyester, the temperature is continued. After dyeing for half an hour, the cellulose fibers are fully colored, and the dye is exhausted, and the color light is substantially unchanged.
4. Direct dark blue L-3RB can be used for continuous padding of cotton. After padding, it is treated with 10~25g/L yuan powder boiling bath, then steamed at 100~103°C for 1-3 minutes.
5. Direct fast blue L-3RB can be used for direct printing of cotton or viscose fabric. When printing deep pattern, add urea and disodium hydrogen phosphate to prepare the printing paste.