Do You Know About Sulphur Black?

sulphur black, also known as ethyl sulphur pyrimidine, is an organic synthetic dye mainly used in dyeing, pigment and ink industries. In the textile industry, sulphur black is the main dye for dyeing cellulose fibers, which is especially suitable for dark products of cotton fabrics, among which

Liquid Sulphur Black and Sulphur Blue 7 are the most common. The dyeing process of sulphur dye is: first, the sulfur dye is reduced and dissolved into a dye solution, and the dyeing leaches formed are adsorbed by cellulose fibers, and then treated by air oxidation to make the cellulose fibers show the required color.

Sulfur black dyeing requires sodium sulfide as a reducing agent to dissolve the dye. Sulfide dyes themselves are insoluble in water, and when alkaline reducing agents are used, dyes can be reduced to leucochromes and dissolved in water, and the formed leucochromic sodium salts can be adsorbed by fibers. In the actual operation process, the reduction and dissolution process of sulfide dyes needs to be fully carried out, and the rate of addition should be slow and uniform. After adding the dye, boil and dye for 10 minutes, and then slowly and evenly add salt to promote dyeing. Be sure to clean thoroughly after dyeing to prevent the residual dye from affecting the dyeing effect. In addition, after dyeing, do not suddenly cool down to prevent “bird paw prints”. At the same time, anti-brittleness treatment requires the use of softeners during the dyeing process.

In addition, sulphur black can also be used to manufacture pigments, because of its good light resistance and weather resistance, so it is widely used in the pigment industry. In ink manufacturing, the application of sulphur black is also very wide, such as ink and printing ink, its color is deep, can provide good printing effect, and has water resistance, wear resistance and chemical resistance