Sulphur Black
Liquid Sulphur Black is extensively used for Denim yarn dyeing either by warp sheet (Slasher dyeing) or Rope dyeing system for obtaining. It is a popular practice for coloring cotton yarn in handloom sector and in this approach; the spent dye bath is being replenished for subsequent dyeing.
Method of Applications
Liquid Sulphur Black is extensively used for Denim yarn dyeing either by warp sheet (Slasher dyeing) or Rope dyeing system for obtaining. It is a popular practice for coloring cotton yarn in handloom sector and in this approach; the spent dye bath is being replenished for subsequent dyeing.
The dye is first made into paste with a little water (containing the requisite amount of Sulphide and soda ash) and then boiled for about ten minutes with further addition of water, to make solution. This solution is then made upto the requisite volume with water in the dyeing vessel. The material to be dyed is then introduced in bath, the temperature is raised and the necessary quantity of common salt or glauber’s salt crystals are added depending upon the depth of the shade required. The material is then rinsed well, after treated if necessary, rinsed again and finished in the normal manner.
This dye belongs to the group of Sulphur Dyes. It is mainly used for dyeing Cellulosic fiber. It is also useful for dyeing viscose, staple fiber and yarn, including material which is to be given a resin finish, Silk, package dyeing and for continuous process. The light fastness of Sulphur Black is very good.
Sulphur black is an excellent dyes for the use of cotton with its high performance and cheaper price, it has been playing an important role in gradually acute market competition since it has born one hundred years ago. Dalian Dyestuffs & Chemicals Corporation had produced sulphur black for more than eighty years, the production capability is 12000 tons per years.
| Prodcut Identification | |
| CAS | 1326-83-6 |
| EINECS | 215-445-8 |
| Formula | Not Avaliable |
| Content | Our Standard 150% contains no more than 63 % of pure dye ; the rest being inert substances such as sodium chloride, sodium sulfate, sodium carbonate, sugar |
| Sales Specification | |
| Appearance | black scale. |
| Shade | corresponding to standard |
| Moisture | 6.0% max. |
| Insoluble matter in sodium sulphide | 0.7% max. |
| Free sulphur content | 0.5% max. |
| Packing | in 25 kgs net iron drums/p.p bag/carton box. |
| Physical and Chemical Properties | |
| solid | |
| Colour | a) powder: black |
| b) 1% water solution: black | |
| Odour | none |
| Bulk density | 450 – 500 kg/m3 |
| Solubility in water | 40 g/l (60 C) |
| Solubility in other solvents | Slightly soluble in DMF, DMSO, pyridin. Insoluble in alcohols, ketones, hydrocarbons, esters. |
| pH value | 8,5 – 10,0 (at 10 g/l, 20° C) |