Sulfur dyeing

Sulfur dyes are insoluble in water and can be dissolved in a sulfuric alkali solution as a leuco chromophore and dyed on fibers. After oxidation, they are converted back to their original insoluble dyes and fixed to the fibers. The color of the sulphur dye is not bright enough, but the price is low. When the dye is dark, the color fastness of the fabric (black and dark blue) is good, and the color fastness of the fabric when dyeing is light is poor.

Sulfur dyes, sulfur black and sulfite blue, are used in many types of dyes. The blackness of the dyed products after vulcanization black dyeing is very good, but the phenomenon of brittleness occurs during storage, and it is generally required before the finished product is finished.

Do anti-embroidery treatment. The oxidation process after dyeing leucoindigo was done with erythromycin sodium (or potassium erythronium) as the oxidant. Now it is necessary to switch to an environmentally friendly oxidant. This must be taken care of when dyeing with sulphur dyes.

In recent years, the requirements for environmental protection have become higher and higher. However, sulfur dyes are still in use and have not been eliminated. The liquid sulphur dyes prepared as leucosomes have made great progress. They are more convenient to use and meet the requirements of energy saving and environmental protection, especially in the dyeing of denim fabrics.

Second, sulfur dye dyeing process
The dyeing process of sulphur dyes can be divided into two types of dyeing and padding. The traditional powdery sulphur dyes are still more common dyeing process; liquid sulphur dyes are generally used padding process, of course, can also be continuous rolling after the dissolving of powdery sulphurous dyes with leucine sulfide into leuco dye body. The coloring soaping unit of the dyeing machine performs padding.

1. Sulfur dyes
The dyeing of sulphur dyes is carried out on a common jigger. In a jigger, the powdered sulphur dyes are first dissolved in the dyeing machine to dissolve leuco dyes. The semi-finished products in the reel are then used as head cloths. Guided into the dye liquor, and then rolled flatly on another cloth roller above the dyeing tank, start the equipment to complete the dyeing process according to the following procedure.

Dyeing → Washing → (Pickling) → (Oxidation) → Washing (Soaping) → Washing → (Fixing or Preventing Embrittlement) → Cold Water Rolling → Drying

1. Sulfur dyeing
The powdered sulphur dyes are first formulated as leuco chromophores with hot sulphide lye in the top bath of the dosing liquid; while the liquid sulphur dyes can be directly dosed at room temperature, the operation is also safer and easier. Sulfur dye padding process is as follows:

Dip pad dyeing liquid → steaming (breathing) → washing → pickling → oxidation → washing → soaping → washing → drying

For liquid sulphur dye padding, whether it needs to be steamed or not should be determined according to customer requirements, and it is also related to the performance and brand of liquid sulphur dyes. If the customer requires good color fastness, it must be steamed and fixed; if the customer requires the dyed product to have a water-washing and fading effect, there is no need for steaming (generally used for the dyeing of denim and washed cloth), steam is not allowed to open in the steamer. ) It's OK.

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