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Direct Black 38 Dyes

Chemical properties Brown-black powder. Soluble in water, green light black, slightly soluble in ethanol, green light blue black, soluble in cellolytic, insoluble in other organic solvents. In case of concentrated sulfuric acid, it is dark red light blue, and after dilution, it is purple sauce color to red light black precipitate; in concentrated nitric acid, it is yellow-brown solution; in concentrated hydrochloric acid, it is dark red light black solution. Its aqueous solution was added with concentrated hydrochloric acid to form a purple sauce-colored precipitate. Add concentrated sodium hydroxide solution, then generate gray precipitate. For cellulose fiber dyeing, the dye exhaustion is very good, and the maximum affinity is at 80 °C. Can be dyed. Uses Mainly used for the dyeing of cellulose fibers such as cotton, hemp, viscose, etc. It can also be used in the dyeing of silk, nylon and its blended fabrics, and can also be used in the dyeing of leather, biology and wood, and the coloring of plastics and as red ink. raw materials etc. Direct black BN is a commonly used black dye, which is mostly used for black alone, and is often combined with brown to form various coffee colors. Uses Mainly used for dyeing and printing of cotton, viscose, silk and linen Uses Mainly used for the dyeing of cellulose fibers such as cotton, Chemicalbook, hemp, viscose, etc. It can also be used for the dyeing of silk, nylon and its blended fabrics. For leather, biological and wood dyeing, plastic coloring and as a raw material for red black water, etc. Direct black BN is a commonly used black fuel, which is mostly used for black alone, and is often combined with brown to form various coffee colors. Uses for cytology and histology staining. The production method takes benzidine, H acid, aniline and m-phenylenediamine as basic raw materials. Benzidine is diazotized and coupled with H acid (the first coupling), aniline is diazotized with the first coupling for the second coupling, then with m-phenylenediamine for the third coupling, and then Salted out, filtered and dried. Kilogram/ton benzidine (100%) 180 aniline 80H acid (100%) 300 m-phenylenediamine (100%) 70 soda ash (industrial) 190 sodium nitrite (industrial) 195 calcium carbonate 25 hydrochloric acid (31%) 550 ammonia water ( 20%) 150 yuan Mingfen 40
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Product Introduction

Product info


Type: Direct Dyes, Direct Black Dyes

Product Name: Direct Black 38, Black EX 150%
CAS No.:1937-37-7
EINECS: 217-710-3
Molecular Formula:C34H25N9Na2O7S2


Product Description



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Formula


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Chemical Properities


Direct Black 38 Dyes is brownish black powdery . Direct Black 38 Dyes soluble in water green black, slightly soluble in ethanol, green blue black, soluble in fibrin, insoluble in other organic solvents. In the thick sulfuric acid was deep red blue, after dilution was purple sauce to red black precipitation; In concentrated hydrochloric acid in a dark red light black solution. Its solution and concentrated hydrochloric acid showed purple sauce precipitation. Add concentrated sodium hydroxide solution, the formation of gray precipitation. For the dyeing of cellulose fiber, the dye absorption is good, and the affinity is the largest at 80℃.


Application


Direct Black 38 Dyes is mainly used for cotton, hemp, viscose and other cellulose fiber dyeing, Direct Black 38 Dyes can also be used for silk, nylon and its blended fabric dyeing, but also can be used for leather, biology and wood Chemicalbook dyeing, plastic coloring and as the raw material of red ink. Direct black BN is commonly used black dye, more alone for black, but also often with brown to spell a variety of brown.


FAQ

1.What certificates do you have?

We have OEKO-TEX, BLUESIGN, ZDHC,etc.

2.Could you indicate please approximatively your yearly capacity in terms of volume of production ?

We have two big factories in China,so you won't worry about our capacity.For only Disperse Dyes,our yearly capacity can reach 35000 tons.

3.How about your delivery time?

Generally speaking,after receiving the payment,we can prepared those cargoes within 3 days and then we can ship out these cargoes within 10 days.

It will base on the shipping company.And it will takes one month for sea transport to destination port.Different countries have different shipping time, which is determined by the shipping company.


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